| Entries |
| Document | Title | Date |
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| 20080260386 | RECONFIGURABLE OPTICAL ADD DROP MULTIPLEXER CORE DEVICE, PROCEDURE AND SYSTEM USING SUCH DEVICE, OPTICAL LIGHT DISTRIBUTOR, AND COUPLING-RATIO ASSIGNING PROCEDURE - A reconfigurable optical add drop multiplexer core device includes a light distributor, a light combiner, and first and second sets of add and drop ports. The light distributor is configured to receive an optical signal along a primary input of the reconfigurable optical add drop multiplexer core device and to distribute the received optical signal along a plurality of subtending outputs. The light combiner is configured to receive optical signals along a plurality of subtending inputs, to combine the received optical signals into a combined signal, and to output the combined signal. The add and drop ports in the first set function as add and drop ports, respectively, and the add and drop ports in the second set function as both add and drop ports, respectively, and as express ports connectable to another reconfigurable optical add drop multiplexer core device. | 10-23-2008 |
| 20080285973 | Optical add/drop multiplexer - There is provided a shutdown controller that monitors the temperature of an optical multiplexer and maximizes the loss of an optical attenuator when a temperature monitor result is abnormal. An optical level change detection circuit section is disposed with respect to an optical level monitor of individual monitors in an optical add/drop multiplexer. An optical level monitor of a total main signal is disposed downstream of the optical multiplexer. The inconsistency of the wavelength number is detected by comparing the total of the optical level monitors of the individual channels with the optical level value of the optical level monitor, upon which shutdown control is performed in which the loss of the optical attenuator is maximized in only the channel whose optical level change is detected by the optical level change detection circuit section. | 11-20-2008 |
| 20090028566 | System and Method for Signaling Between Elements in an Undersea Optical Communication System and System Incorporating the Same - A system for signaling between elements in an undersea optical communication system including a cable signal generator. The signal generator includes line current modulation circuitry configured to impart modulation in line current provided on a power conductor of the transmission cable. A method of signaling between elements in an undersea optical communication system includes modulating a line current through an element and detecting the modulated current. | 01-29-2009 |
| 20090034978 | Directionless Reconfigurable Optical Add and Drop Mesh Node - A reconfigurable optical add/drop multiplexer (ROADM) with a multiplexer, demultiplexer, and a wavelength cross-connect unit provides directionless capabilities. The ROADM allows a signal not to be limited to a particular direction when added at an optical network node, for example. The signal can be sent to other directions of the optical network node. Furthermore, the ROADM allows the wavelengths of add and drop signals to be changed and hence is “colorless.” | 02-05-2009 |
| 20090067845 | SIGNAL DISTRIBUTION MODULE FOR A DIRECTIONLESS RECONFIGURABLE OPTICAL ADD/DROP MULTIPLEXER - The present invention provides a signal distribution module for use in a directionless reconfigurable optical add/drop multiplexer application, including: a multi-cast switch having a plurality of input ports and a plurality of output ports; a plurality of optical amplifiers coupled to the plurality of input ports of the multi-cast switch, wherein the plurality of optical amplifiers form an optical amplifier array; a tunable optical splitter coupled to the plurality of optical amplifiers; and a pump laser coupled to the tunable optical splitter. | 03-12-2009 |
| 20090074418 | SELF CHECKING OPTICAL ADD DROP MULTIPLEXER - A technique is proposed for performing add/drop operations in an OADM assembly serving an optical network and comprising an add unit and a drop unit. With respect to at least one optical channel assigned to an optical wavelength λ, the OADM assembly is capable of dropping the channel from the network via the drop unit as a first signal, and adding the channel to the network via the add unit as a second signal. According to the technique, the OADM assembly additionally comprises an authentication and control unit ACU for authenticating the at least one optical channel and controlling the OADM assembly. The ACU is authenticates the optical channel by comparing one or more components of the first signal with one or more components of the second signal serving as a reference, and based on the authentication result, makes decisions whether to allow or block the dropping and/or adding of the optical channel. | 03-19-2009 |
| 20090116840 | WAVELENGTH DIVISION MULTIPLEX (WDM) OPTICAL DEMULTIPLEXER - An optical demultiplexer ( | 05-07-2009 |
| 20090116841 | Systems and methods for adaptive gain control to compensate OSNR penalty caused by side-lobe of MEMS-based reconfigurable optical add-drop multiplexers - The present invention provides systems and methods to adaptively control amplifier target power to maintain signal launching power as per design in networks with wavelength selective switch (WSS)-based reconfigurable optical add-drop multiplexers (ROADMs) using micro-electromechanical system (MEMS). Accordingly, signal OSNR does not collapse faster for WSS-based ROADMs than other similar configured system without WSS-based ROADM. In order to correct amplifier target power, the present invention utilizes system information about side-lobe size and OSNR at each amplifier. Related information, such as ASE level and size of side-lobes at each channel from upstream amplifiers, is passed to the network controller at each amplifier. Meanwhile, with target signal level and local WSS attenuation setting (given side-lobe size vs. WSS attenuation known) of each channel, the amplifier calculates what is total output power should be and adaptively maintains that power. | 05-07-2009 |
| 20090116842 | TRANSIENT CONTROL SOLUTION FOR OPTICAL NETWORKS - An optically amplified wavelength division multiplexing network has the functionality to add/drop channels at the optical add/drop multiplexing (OADM) nodes. The OADM node includes a receiver amplifier, an OADM module, and a transmitter amplifier. Once the OADM node detects a loss of signal (LOS) due to a fiber cut or network element failure upstream, the receiver amplifier is kept in operation as a noise source. The output of the receiver amplifier is immediately raised by increasing pump power to compensate for the LOS. The noise power received at the transmitter amplifier from the receiver amplifier is substantially equal to the signal power expected before LOS. The transient effect of downstream optical amplifiers is therefore completely suppressed and the inter-channel stimulated Raman scattering (SRS) induced spectrum tilt does not change. After the noise power is raised, the receiver amplifier may be shut down at a speed much slower than the speed of downstream amplifier control circuitry. | 05-07-2009 |
| 20090148166 | Optical Add/Drop Multiplexer - An optical add/drop multiplexer includes a first optical coupler receiving an optical signal including a plurality of multiplexed wavelengths, a wavelength blocker receiving the optical signal from the first optical coupler, and blocking at least one wavelength of the plurality of multiplexed wavelengths, a first wavelength selective switch, having one input port receiving the outputted optical signal from the first optical coupler and a plurality of output ports, demultiplexing a plurality of arbitrarily selected multiplexed wavelengths from the received optical signal, a second wavelength selective switch, having a plurality of input ports, each input port receiving a different optical signal and one output port, multiplexing a plurality of arbitrarily selected wavelength signals on the plurality of input ports, and a second optical coupler receiving the optical signal output from the wavelength blocker and multiplexed wavelength signal from the second wavelength selective switch. | 06-11-2009 |
| 20090154930 | PLUGGABLE MODULE FOR A NETWORK WITH ADD-DROP FUNCTIONALITY - The invention provides a network and a method for bidirectional transport of data and in particular a pluggable module for bidirectional transport of data via at least one optical fibre between host devices providing an add/drop functionality by means of an integrated bandwidth adaption unit. The network comprises at least one host device having an interface card connected to a backplane of the host device, wherein the interface card comprises at least one cage for receiving a pluggable module which provides the add/drop functionality between an optical interface and the electrical host interface. | 06-18-2009 |
| 20090180779 | Methods and apparatus for performing directionless wavelength addition and subtraction within a ROADM based optical node - In today's reconfigurable optical add/drop multiplexer (ROADM) based optical node, transponders associated with the ROADMs' add/drop ports are dedicated to a given network node interface. Dedicated transponders reduce the flexibility to route around network failures. Example embodiments of the invention includes an optical node and corresponding method for routing optical signals within an optical node. The optical node may include at least two ROADMs to transmit respective wavelength division multiplexed (WDM) signals onto at least two inter-node network paths and at least one add/drop module including add ports to direct add wavelengths received from tributary network paths to each of the ROADMs via intra-node network paths to allow the wavelengths to be available to be added to the inter-node network paths. Advantageously, a transponder may transmit and receive to and from different network node interfaces within the optical node, thereby improving the optical node's ability to route around network failures. | 07-16-2009 |
| 20090208217 | RADIATION MODULATION BY REFLECTION FROM CONTROLLED COMPOSITE MATERIAL - Modulation of electromagnetic radiation is described in which an incident radiation beam is directed toward a surface of a composite material and at least partially reflects to form a reflected radiation beam. The composite material comprises an arrangement of electromagnetically reactive cells of small dimension relative to a wavelength of the incident radiation beam, and exhibits at least one of a negative effective permeability and a negative effective permittivity for at least one frequency. A modulation signal is applied to the composite material to cause a variation in at least one of the effective permeability and the effective permittivity, at least one characteristic of the reflected radiation beam being modulated according to the modulation signal. | 08-20-2009 |
| 20090208218 | METHOD AND APPARATUS FOR DISPATCHING SIGNALS IN AN OPTICAL TRANSPORT NETWORK - Methods and apparatuses for dispatching OTN signals are disclosed. The method includes receiving an OTN signal frame; determining in sequence whether each byte in the OTN signal frame is an overhead byte; determining, if the byte is an overhead byte, whether the byte includes frame alignment data; and assigning, if the byte includes frame alignment data, the byte in sequence to a corresponding channel based on a sequence number of an OTN signal frame period, or storing, if the byte does not include frame alignment data, the byte in a buffer; or assigning, if the byte is not an overhead byte, the byte in sequence to a corresponding channel based on a location of the byte in the OTN signal frame. | 08-20-2009 |
| 20090257751 | Aggregating Optical Network Device - A method and apparatus for an electrically switched optically protecting network device is described. One embodiment of the invention established pairs of optical circuits between different electrically switched optically protecting network devices acting as access nodes of an optically switched network. The network device communicates different add/drop traffic flows between externally facing ports of different electrically switched optically protecting network devices by transmitting over the optical circuit. In addition, the network device optically switches optical circuits for which the network device is an intermediate node and electrically switches packets between different ones of the network devices' externally facing ports and those of the optical circuits for which the network device is an end node. Furthermore, the network device protects the communication of traffic flows across the optical network by controlling the packet electrical switching to the pairs of optical circuits. | 10-15-2009 |
| 20090324232 | METHOD AND SYSTEM FOR ANNOUNCING TRAFFIC ENGINEERING PARAMETERS OF COMPOSITE TRANSPORT GROUPS - An approach is provided for announcing aggregate characteristics of a composite transport group (CTG) for traffic engineering. Information specifying characteristics of a plurality of component links of the CTG is received. An aggregate characteristic of the CTG is determined based the information. The aggregate characteristic is announced to a label switched network for provisioning label switched paths on the CTG. | 12-31-2009 |
| 20100008671 | High Density Wave Channel Optical Data Communications - A high density data communications system and associated method comprises a multi-wavelength light source that provides a combined plurality of constituent lights having different wavelengths to a diffraction device that spatially separates the constituent lights to form a predetermined pattern of lights in order by their wavelengths, a light modulating processing array that individually modulates the separated lights in parallel according to data to form constituent light channels, a combiner that recombines the modulated separated light channels in parallel into a composite data communication light, a second diffraction device that spatially separates the modulated light channels into the predetermined pattern of wavelengths, and a demodulating processing array that extracts the data from the constituent modulated light channels. | 01-14-2010 |
| 20100028008 | Control device of node transferring signal light - To provide a technology of preventing an optical signal from being mistakenly recognized as an optical noise even when a surge occurs. A control device of a node that transfers signal light monitors inputted light, determines, when power of the inputted light reaches a saturation level of a monitor unit as a result of monitoring, that the inputted light is signal light, further determines based on a spectral line shape of the inputted light, when the power thereof does not reach the saturation level, whether the inputted light is the signal light or ASE light; and stops a transfer of the ASE light if determined to be the ASE light. | 02-04-2010 |
| 20100034538 | Hardened, Wavelength Enabled Optical Capacity - Providing bandwidth expansion in existing HFC infrastructures. A break in a fiber ring is established. A temperature hardened demultiplexer is coupled at the break to an input side of the fiber ring. A temperature hardened multiplexer is coupled at the break to an output side of the fiber ring. The temperature hardened demultiplexer is configured to pass-through a first predetermined wavelength to the temperature hardened multiplexer and to drop out a second predetermined wavelength. The second predetermined wavelength is extended from the demultiplexer for providing a first predetermined wavelength to an expansion node. The temperature hardened multiplexer is configured to receive the first predetermined wavelength from the temperature hardened demultiplexer and to receive the second predetermined wavelength from the expansion node. | 02-11-2010 |
| 20100067912 | SPATIAL LIGHT MODULATOR-BASED RECONFIGURABLE OPTICAL ADD-DROP MULTIPLEXER AND METHOD OF ADDING AN OPTICAL CHANNEL USING THE SAME - A reconfigurable optical add-drop multiplexer (ROADM) and a method of passing at least one optical channel through the multiplexer. In one embodiment, the multiplexer includes: (1) a main input port, (2) a main output port, (3) an add input port, (4) a drop output port, (5) dispersive optics configured spatially to spread and recombine optical spectra containing optical channels and (6) a spatial light modulator having an integral, lateral-gradient volume Bragg grating and configured to assume a bar state in which at least one of the optical channels is passed from the main input port to the main output port and at least another of the optical channels is passed from the add input port to the drop output port and a cross state in which the integral, lateral-gradient volume Bragg grating is transmissive with respect to the channels. | 03-18-2010 |
| 20100119232 | LIGHT SOURCE DISTRIBUTOR FOR USE IN WAVELENGTH DIVISION MULTIPLEXED-PASSIVE OPTICAL NETWORK - The present disclosure is directed to a light source distributor for use in an injection-locked WDM-PON (wavelength division multiplexed-passive optical network). The light source distributor receives an A band and a B band injection optical signals through a single optical terminal from an injection light source for outputting both the A band and the B band injection optical signals; transmits the A band injection optical signal to a first optical multiplexer/demultiplexer of a central office and the B band injection signal to a second optical multiplexer/demultiplexer of a remote node; transmits a wavelength-locked A band optical signal received from the first optical multiplexer/demultiplexer to the second optical multiplexer/demultiplexer; and transmits a wavelength-locked B band optical signal received from the second optical multiplexer/demultiplexer to the first optical multiplexer/demultiplexer. | 05-13-2010 |
| 20100129082 | OPTIMIZED DIRECTIONLESS OPTICAL ADD/DROP MODULE SYSTEMS AND METHODS - The present disclosure provides optimized configurations for a directionless reconfigurable optical add/drop multiplexer application. The present invention includes an add module with improved optical signal-to-noise through placing amplifiers prior to a multi-cast optical switch. The present invention includes various drop module configurations utilizing distributed gain, channel selective filters, and bi-directional configurations to reduce power consumption and complexity. Additionally, the present invention includes an integrated broadcast and select architecture. | 05-27-2010 |
| 20100142961 | Methods for dynamic wavelength add/drop in a ROADM optical network - A system and method for dynamically adding/dropping wavelengths in a reconfigurable optical add-drop multiplexer (ROADM) transport network is disclosed. The system includes at least one optical transponder, a plurality of optical fan-out devices, each arranged to receive an input signal from a network degree and coupled to at least one of a plurality of optical fan-in devices, each optical fan-in device arranged to output a signal to a network degree, the optical fan-out devices comprising at least one wavelength selective switch and the optical fan-in devices comprising at least one wavelength selective switch, the optical fan-out devices and optical fan-in devices being connected so as to enable signals input from each of the plurality of network degrees to be switched to another network degree of the plurality of network degrees; a plurality of demultiplexers for locally dropping selected wavelengths; a plurality of multiplexers for locally adding selected wavelengths; and at least one fiber switch interposed between the at least one optical transponder and the plurality of demultiplexers and multiplexers. The fiber switch is coupled to wavelengths and degrees that are allocated for a bandwidth-on-demand application. Other configurations include additional fan-in and fan-out devices interposed between a mux/demux assembly and the optical transponders to support wavelength redistribution applications. | 06-10-2010 |
| 20100183311 | HIGH-DEGREE RECONFIGURABLE OPTICAL ADD-DROP MULTIPLEXING SYSTEMS USING BI-DIRECTIONAL WAVELENGTH SELECTIVE SWITCHES - The present disclosure provides high-degree reconfigurable optical add-drop multiplexing (ROADM) systems using bi-directional wavelength selective switches (WSSs) and optical circulators. A single WSS is utilized on each degree of a node in a bi-directional manner, i.e. both ingress and egress share the same WSS. Advantageously, the present invention eliminates conventional splitters/combiners thereby capping intra-node insertion loss to a certain value regardless of the number of degrees. More importantly, the present invention reduces noise penalty associated with high-degree nodes while minimizing cost. | 07-22-2010 |
| 20100202777 | Mechanism to dectect an unstable wavelength channel and limit its impact on a ROADM network - A system and method for limiting the impact of an unstable wavelength on other wavelengths in a reconfigurable optical add/drop multiplexer (ROADM) network are disclosed. The method generally comprises measuring optical channel power at prescribed time intervals; for each measurement of channel power falling outside a predefined threshold, recording a threshold crossing event; comparing the recorded threshold crossing events to stored criteria indicative of an unstable wavelength channel; and removing an unstable wavelength from the ROADM network if the threshold crossing events exceed the stored criteria. | 08-12-2010 |
| 20100202778 | Shared, Colorless Add/Drop Configuration for a ROADM Network using MxN Wavelength Swithches - A system and method for dynamically adding/dropping wavelengths in a reconfigurable optical add-drop multiplexer (ROADM) transport network is disclosed. The system includes a plurality of M×N wavelength selective switches (WSS) for locally dropping selected wavelengths at a node, where each M×N WSS has M inputs connected to optical fan-out devices in each of M network degrees, and a plurality of M×N wavelength selective switches for locally adding selected wavelengths to a node, where each M×N WSS has M outputs connected to optical fan-in devices in each of M network degrees. Several expedients of M×N wavelength selective switches comprising M switching elements for use in the system are also disclosed. | 08-12-2010 |
| 20100272441 | Methods and apparatus for performing directionless and contentionless wavelength addition and subtraction - In today's reconfigurable optical add/drop multiplexer (ROADM) based optical node, ROADMs multiplex (and demultiplex) colored optical signals to form wavelength-division multiplexed (WDM) signals. Transponders connected to the ROADMs' add/drop ports convert noncolored optical signals to colored optical signals (and vice versa). Dedicating transponders to given ports degrades the node's ability to route around network failures. Example embodiments of the invention include an optical node and corresponding method for routing optical signals within an optical node that compensate for this inflexibility. The optical node may include two ROADMs to transmit respective WDM signals onto at least two internode network paths and a routing module that can direct channels of the same wavelength along different internode network paths. Advantageously, a transponder may transmit (receive) different signals at the same wavelength to (from) different network node interfaces within the optical node, thereby improving the optical node's ability to route around network failures. | 10-28-2010 |
| 20100329684 | CHANNEL EXPRESS/ADD OPTICAL MODULE AND CHANNEL EXPRESS/ADD METHOD IN OPTICAL ADD/DROP MULTIPLEXER NODE USING THE SAME - Provided are a channel express/add optical module and a method of channel express/add in an optical add/drop multiplexer node using the channel express/add optical module. The channel express/add optical module comprises: a multiplexer/demultiplexer which demultiplexes a multiplexed optical signal having a plurality of wavelengths into individual wavelength optical signals or multiplexes a plurality of different wavelength optical signals; a plurality of 1×2 switches each of which includes a first output end that guides the demultiplexed different wavelength optical signals to output them thereto and a second output end through which new wavelength optical signals; and a plurality of reflectors each of which reflects the optical signal output to the first output end so that the optical signal is feedback to the multiplexer/demultiplexer via the 1×2 switches. | 12-30-2010 |
| 20100329685 | OPTICAL DEVICE WITH REDUCED THERMAL TUNING ENERGY - An optical device that includes multiple optical modulators having actual operating wavelengths at a given temperature is described. Because of differences between the actual operating wavelengths and target operating wavelengths of the optical modulators, heating elements may be used to thermally tune the optical modulators so that the actual operating wavelengths match corresponding carrier wavelengths in a set of optical signals. Furthermore, control logic in the optical device may assign the optical modulators to the corresponding carrier wavelengths based at least on differences between the carrier wavelengths and the actual operating wavelengths, thereby reducing an average thermal tuning energy associated with the heating elements. | 12-30-2010 |
| 20100329686 | OPTICAL COMMUNICATION SYSTEMS AND METHODS UTILIZING A SPLIT AMPLIFICATION BAND AND NONLINEAR COMPENSATION - The present disclosure provides optical communication systems and methods that utilize, on top or in place of the conventional framework: (1) optical amplifiers that are provided with extended bandwidth coverage, such as Extended Band Erbium-Doped Fiber Amplifiers (EDFAs), combination of Raman amplifiers and EDFAs, Split-Band C+L EDFAs, etc.; (2) ROADMs that are configured in a conventional manner in a portion of the optical amplification spectrum—providing connectivity between network nodes with adjacency within conventional unregenerated optical reach; (3) an optical amplification spectrum with a portion reserved for “ultra-express” channels between far-spaced network nodes, with OPC mechanisms placed exclusively in this portion of the optical amplification spectrum to extend unregenerated optical reach; (4) “express” channels that effectively bypass intermediate ROADM hardware via band filtering, thereby minimizing detrimental filtering and amplified spontaneous emission (ASE) accumulation impacts; and (5) if optical reach to far-off ROADM nodes is required, a loopback at the terminal. | 12-30-2010 |
| 20110026928 | TRANSIENT CONTROL SOLUTION FOR OPTICAL NETWORKS - An optically amplified wavelength division multiplexing network has the functionality to add/drop channels at the optical add/drop multiplexing (OADM) nodes. The OADM node includes a receiver amplifier, an OADM module, and a transmitter amplifier. Once the OADM node detects a loss of signal (LOS) due to a fiber cut or network element failure upstream, the receiver amplifier is kept in operation as a noise source. The output of the receiver amplifier is immediately raised by increasing pump power to compensate for the LOS. The noise power received at the transmitter amplifier from the receiver amplifier is substantially equal to the signal power expected before LOS. The transient effect of downstream optical amplifiers is therefore completely suppressed and the inter-channel stimulated Raman scattering (SRS) induced spectrum tilt does not change. After the noise power is raised, the receiver amplifier may be shut down at a speed much slower than the speed of downstream amplifier control circuitry. | 02-03-2011 |
| 20110026929 | Reconfigurable Optical Add/Drop Multiplexer - Disclosed is an add-drop multiplexer that receives an optical signal having a plurality of channels. The multiplexer spatially separates the channels, and a spatial light modulator within the multiplexer, which in some embodiments is a switched blazed grating, routes the channels along first or second paths according to whether the particular channels are to be sent along as a part of an output communication signal or “dropped” into a dropped-channel optical communications signal. The add-drop multiplexer is also operable to receive optical channels to be added to an optical signal and to use a spatial light modulator to add those optical signals to that optical signal. | 02-03-2011 |
| 20110052200 | MULTI-MODE MULTIPLEXING USING STAGED COUPLING AND QUASI-PHASE-MATCHING - A mode-selective add/drop unit for a mode division de/multiplexing device includes an optical ADU waveguide adapted for coupling to an input optical waveguide. The optical ADU waveguide includes at least one region providing optical signal coupling between the ADU waveguide and a multi-mode waveguide; and, one or more phase matching regions for controlling a relative or absolute phase difference between an electromagnetic wave (EMW) carried in the ADU waveguide and the multi-mode waveguide. The mode-selective add/drop unit may further include a transition region connecting the coupling region and a phase matching region, wherein a shape of a transition region is governed by a polynomial function, exponential function, logarithmic function, trigonometric function or, any combination of these functions. | 03-03-2011 |
| 20110052201 | MODULAR COLORLESS AND DIRECTIONLESS MULTI-DEGREE RECONFIGURABLE OPTICAL ADD/DROP MULTIPLEXER NODE WITH IN-SERVICE UPGRADEABILITY - In a dense wavelength division multiplexed optical network, an upgradeable, modular, colorless, directionless, reconfigurable add/drop multiplexer having a small form factor. By using wavelength selective switches and couplers, the above features are achieved without the need for photonic cross connects. | 03-03-2011 |
| 20110103798 | ADD-DROP BENES NETWORKS - Benes networks include an input stage having a plurality of input ports, an input connection stage configured to connect output signals of the input stage, an add connection stage configured to connect outputs of the input connection stage and to connect inputs of add ports corresponding in number to the number of the plurality of input ports, a drop connection stage configured to connect outputs of the add connection stage, to output some outputs to a next stage, and to output some outputs to drop ports, an output connection stage configured to connect the some outputs of the drop connection stage to an output side, and an output stage configured to output the outputs of the output connection stage to output ports. | 05-05-2011 |
| 20110135310 | Channel Power Management in a Branched Optical Communication System - Channel power management may be achieved in a branched optical communication system such that uniform loading is provided across branch channels on a branch drop path without passing information signals that are not intended for the branch terminal to the branch drop path. In general, a system and method consistent with the present disclosure reuses one or more loading signals (e.g., noise bands) from the branch add path to maintain uniform loading in the branch drop path of the same branch. The system and method thus prevents trunk channels from being dropped to a branch terminal when those trunk channels are not intended for the branch terminal. | 06-09-2011 |
| 20110182585 | OPTICAL TRANSMISSION APPARATUS AND CONTINUITY TESTING METHOD - An optical transmission apparatus includes an amplifier, a first output port to select a wavelength from the wavelength-division-multiplexed signal light amplified and output signal light with the selected wavelength to an operation line, a second output port to output multiplexed light obtained by multiplexing any one of first spontaneous emission light and second spontaneous emission light to a preliminary line, the first and the second spontaneous emission light being parts of spontaneous emission light generated by the amplifier, the first spontaneous emission light being in a wavelength range that is not selected, and the second spontaneous emission light being in a wavelength range other than a range of the wavelength-division-multiplexed signal light, and a judger to judge a continuity state of the operation line by using the signal light output to the operation line and a continuity state of the preliminary line. | 07-28-2011 |
| 20110206377 | PRIORITIZED OPTICAL ARBITRATION SYSTEMS AND METHODS - Various embodiments of the present invention relate to systems and methods for achieving low-latency, prioritized, distributed optical-base arbitration. In one embodiment, an optical arbitration system ( | 08-25-2011 |
| 20110262141 | INNOVATIVE ARCHITECTURE FOR FULLY NON BLOCKING SERVICE AGGREGATION WITHOUT O-E-O CONVERSION IN A DWDM MULTIRING INTERCONNECTION NODE - According to one general aspect, an interconnection node may be configured to dynamically provide interconnection access between a first optical network (e.g., a core optical network) and at least either a second optical network (e.g., an access optical network) or a third optical network (e.g., another access optical network) in a purely optical fashion. The interconnection node may include a first network portion and a second and third network portions. The first network portion may be coupled with the first network that includes a first pair of wavelength cross-connect (WXC) units coupled between a first transmission path of the first network, and providing a plurality of add and drop ports, and a second pair of wavelength cross-connect (WXC) units coupled between a second transmission path of the first network, and providing a plurality of add and drop ports. The second network portion may be coupled with the second network and the first network portion of the interconnection node such that optical signals may be routed between the second network and the first network. The third network portion may be coupled with the third network and the first network portion of the interconnection node such that optical signals may be routed between the third network and the first network. | 10-27-2011 |
| 20110262142 | RECONFIGURABLE OPTICAL ADD DROP MULTIPLEXER NODE AUTOMATED TOPOLOGY DISCOVERY SYSTEMS AND METHODS - The present disclosure provides reconfigurable optical add drop multiplexer (ROADM) node automatic topology discovery systems and methods providing a mapping of optical connections within a mesh optical network that includes tunable lasers and multi-degree ROADM's with colorless/directionless add/drop. The present disclosure may include additional transceiver, receiver, and add/drop filter equipment integrated in or disposed at a ROADM degree. This equipment supports a so-called topology wavelength which is one of a plurality of wavelengths supported by a wavelength division multiplexed (WDM) system that is dedicated and used solely for topology discovery. The topology wavelength may be utilized by the system to detect interconnects between ROADM degrees and between XCVRs/CDMDs. Further, the automated topology discovery may be integrated within a management system and/or control plane. | 10-27-2011 |
| 20110262143 | ROADM SYSTEMS AND METHODS OF OPERATION - ROADM node systems and methods of operation are disclosed. ROADM node systems may include transponder aggregators including transponders to add signals for switching through the ROADM node. The transponder aggregators include optical couplers constrained that are from coupling added signals on adjacent channels for simultaneous use. The ROADM system may include an optical interleaver that can provide an additional filtering function for the coupled signals prior to transmission of the signals on a WDM network. | 10-27-2011 |
| 20110286746 | Transponder Aggregator Without Wavelength Selector for Colorless and Directionless Multi-Degree ROADM Node - A method for transponder optical channel selection of optical signals from a transponder aggregator includes choosing wavelength division multiplexing channels to be dropped from a transponder aggregator receiving optical input signals, splitting all dropped wavelength division multiplexing channels into at least one transponder having a coherent receiver and transmitter, and tuning a local oscillator laser of the coherent receiver to a wavelength of one of the all dropped wavelength division multiplexing channels for selecting one of the all dropped wavelength division multiplexing channels. | 11-24-2011 |
| 20120008957 | Optical transmission system and optical transmission method - An optical transmission system includes a plurality of optical nodes that transmits wavelength multiplexing light including a plurality of signal light components having different wavelengths, wherein each of the optical nodes includes superimposed signal light generation circuit which superimposes a low frequency signal having a common frequency on a corresponding signal light component included in the wavelength multiplexing light; low frequency signal extraction circuit which extracts a low frequency signal having a frequency of a given range from a corresponding signal light component; and pass-through node number measurement circuit which measures, for each of the signal light components, a pass-through node number based on the frequency of the low frequency signal extracted by the low frequency signal extraction circuit, the pass-through node number being the number of optical nodes through which the signal light component has passed before being transmitted to a specific optical node. | 01-12-2012 |
| 20120087669 | OPTICAL NODE AND OPTICAL COMMUNICATION METHOD - In an optical node, a transmitter produces an optical supervisory signal for supervising an optical network, a processor is operative to control a power level of the optical supervisory signal according to a per-wavelength power level of an optical communication signal when the optical node has no post amplifiers, and a multiplexer combines the controlled optical supervisory signal with the optical communication signal to be transmitted to another optical node located downstream. | 04-12-2012 |
| 20120106970 | RECONFIGURABLE OPTICAL ADD DROP MULTIPLEXER CORE DEVICE, PROCEDURE AND SYSTEM USING SUCH DEVICE, OPTICAL LIGHT DISTRIBUTOR, AND COUPLING-RATIO ASSIGNING PROCEDURE - A reconfigurable optical add drop multiplexer core device includes a light distributor, a light combiner, and first and second sets of add and drop ports. The light distributor is configured to receive an optical signal along a primary input of the reconfigurable optical add drop multiplexer core device and to distribute the received optical signal along a plurality of subtending outputs. The light combiner is configured to receive optical signals along a plurality of subtending inputs, to combine the received optical signals into a combined signal, and to output the combined signal. The add and drop ports in the first set function as add and drop ports, respectively, and the add and drop ports in the second set function as both add and drop ports, respectively, and as express ports connectable to another reconfigurable optical add drop multiplexer core device. | 05-03-2012 |
| 20120121267 | OPTICAL ADD-DROP MULTIPLEXER BRANCHING UNIT AND CORRESPONDING OPTICAL TRANSMISSION METHOD AND SYSTEM - Embodiments of the present invention provide an Optical Add-Drop Multiplexer (OADM) Branching Unit (BU) and the corresponding optical transmission method and system. The method includes: separating a part of optical signals of different wavelengths from two trunk fibers respectively, coupling the part of optical signals of different wavelengths, and transmitting the coupled optical signals to a branch station through a fiber; separating, according to wavelengths, optical signals that have different wavelengths and are transmitted by the branch station through a fiber, and then transmitting the optical signals to the two trunk fibers respectively; separating null-compensation light from the optical service signals transmitted through a fiber by the branch station to obtain the null-compensation light; coupling the null-compensation light with the part of optical signals that have different wavelengths and are respectively separated from the two trunk fibers, and transmitting the coupled optical signals to the branch station through a fiber. | 05-17-2012 |
| 20120201543 | OPTICAL BRANCHING UNIT, OPTICAL COMMUNICATION SYSTEM, AND OPTICAL MULTIPLEXING METHOD - An optical-branching unit enables suppression of deterioration of the transmission characteristic of a survivor signal without executing complex control of constant-power output. Optical-amplification means amplifies and supplies a input optical signal, and when not receiving the optical signal, amplifies and supplies amplified spontaneous emission that the optical-amplification means generates. Detection means detects whether the optical signal is input to the optical-amplification means. When the optical signal is not input to the optical-amplification means, control means sets gain that determines the magnitude of amplification in the optical-amplification means to a predetermined value greater than gain at the time the optical signal is input to the optical-amplification means. Add/drop-multiplexing means receives the output light from the optical-amplification means and other output light and multiplexes an optical signal of a predetermined wavelength in the output light from the optical-amplification means and an optical signal of a specific wavelength in the other output light. | 08-09-2012 |
| 20120213523 | OPTICAL-LAYER TRAFFIC GROOMING AT AN OFDM SUBCARRIER LEVEL WITH PHOTODETECTION CONVERSION OF AN INPUT OPTICAL OFDM TO AN ELECTRICAL SIGNAL - A method for optical layer traffic grooming includes receiving at least two optical input signals into respective optical receivers, each optical receiver having a photodetector for converting the respective optical input signal into a respective electrical signal; a grooming processor responsive to the electrical signals, the grooming processor being a radio frequency RF processor for processing the electrical signals at a subcarrier level to produce an RF orthogonal frequency division multiplexing signal OFDM signal; and modulating the groomed RF OFDM signal at a transmitter for conversion of the groomed RF OFDM into an optical signal. | 08-23-2012 |
| 20120275794 | TECHNIQUE FOR BLOCKING OF OPTICAL CHANNELS - A method and a Reconfigurable Optical Add Drop Multiplexer (ROADM) where blocking of a first optical signal carried over a specific optical channel in the ROADM is performed by compensating the first optical signal by a second optical signal created for that purpose. | 11-01-2012 |
| 20120294618 | Reconfigurable Optical Add/Drop Multiplexer and Reconfigurable Optical Add/Drop Multiplexing Method - A reconfigurable optical add/drop multiplexer and a reconfigurable optical add/drop multiplexing method are provided. The reconfigurable optical add/drop multiplexer comprises: an optical processing unit for receiving a first optical signal containing a plurality of optical channels, processing the first optical signal to generate a second optical signal which is a part of the first optical signal, and outputting the second optical signal; and a coherent detection unit for performing a coherent detection on the second optical signal so as to separate from the second optical signal an optical channel contained therein, and outputting the optical channel. With the reconfigurable optical add/drop multiplexer and the reconfigurable optical add/drop multiplexing method, any number of degrees can be supported, and adding/dropping of an optical channel with any wavelength and any bandwidth to/from any direction can be achieved, so that requirements of being colorless, directionless, contentionless and gridless can be satisfied. | 11-22-2012 |
| 20130142516 | APPARATUS AND METHOD FOR DISTRIBUTED COMPENSATION OF NARROW OPTICAL FILTERING EFFECTS IN AN OPTICAL NETWORK - The present disclosure describes a reconfigurable optical add-drop multiplexer including a wavelength selective switch configured to filter wavelengths of an optical signal; and an optical equalizer, coupled to the wavelength selective switch, configured to equalize the optical signal to mitigate optical filtering effects caused by the wavelength selective switch. | 06-06-2013 |
| 20130195462 | Scalable Reconfigurable Optical Add-Drop Multiplexer - An apparatus includes a first optical switching complex, a second optical switching complex in optical communication with the first optical switching complex, and an optical add/drop module in optical communication with the first optical switching complex and the second optical switching complex. At least one of the optical switching complexes includes a wavelength selective switch that is configured to be arranged in a cascaded configuration that, when so configured, results in an increase in a number of available transmit and receive ports available per degree of the apparatus. | 08-01-2013 |
| 20130308951 | Wavelength Tunable Array For Data Communications - Systems and apparatus for data communications comprising a plurality of wavelength tunable submodules in an array is provided. Each submodule has a wavelength tunable laser, and each submodule comprises, as an individual unit, a self-contained wavelength locker having optical and/or optoelectronic functions. The system may be a transponder array comprising a plurality of WDM or DWDM modules. In some embodiments, the individual submodules may comprise photonic integrated wavelength tunable lasers with other optical, electrical and optoelectronic components. Each wavelength tunable submodule incorporated into the module or array can have the same or different optical wavelength and other parameters including but not limited to modulation format. By utilizing the wavelength tunable laser submodules to build a module or array, the need for individual modules dedicated to wavelength sub-bands in the array is eliminated. The same tunable module can be used to fill all the wavelengths on a transmission fiber. | 11-21-2013 |
| 20130315601 | OPTICAL TRANSMISSION DEVICE - The present invention reduces the number of amplifiers and reduces the maximum output of an optical transmission device. A wavelength selection unit selects and outputs, as a drop signal, any given wavelength of optical signal from an input optical signal. An amplifier amplifies at each wavelength the drop signal output by the wavelength selection unit. In this case, the number of amplifiers is set smaller than the number of wavelengths of the input optical signal. Also, the wavelength selection unit selects a number of wavelengths of drop signals corresponding to the number of amplifiers, and outputs the drop signals to the amplifiers at each wavelength. | 11-28-2013 |
| 20130315602 | OPTICAL TRANSMISSION DEVICE - The present invention reduces the number of amplifiers and reduces the maximum output of an optical transmission device. | 11-28-2013 |
| 20130336658 | SPECTRUM EFFICIENT OPTICAL TRANSPORT SYSTEM WITH SUPERCHANNELS - A method, performed by a computer device, may include determining that an available spectrum, associated with an optically switched light path, has been allocated for one or more superchannels and identifying a leftover spectrum, associated with the one or more superchannels allocated for the optically switched light path. The method may further include selecting a use for the leftover spectrum; selecting one or more devices to configure based on the selected use; configuring the selected one or more devices to use the leftover spectrum; and sending data via the leftover spectrum using the configured one or more devices. | 12-19-2013 |
| 20140023373 | OPTICAL SIGNAL DROPPER AND OPTICAL SIGNAL ADDER FOR USE IN A ROADM SYSTEM - A plurality of output units | 01-23-2014 |
| 20140029948 | MULTI-BAND RECONFIGURABLE OPTICAL ADD-DROP MULTIPLEXER (ROADM) SYSTEM - A device includes a first band coupler, a first reconfigurable optical add-drop multiplexer (ROADM), a second ROADM, and a second band coupler. The first band coupler is configured to decouple a regular band and an extended band. The first ROADM is configured to add or drop one or more frequencies in the decoupled regular band to produce a first output in the regular band. The second ROADM is configured to add or drop one or more frequencies in the decoupled extended band to produce a second output in the extended band. The second band coupler is configured to couple the first output and the second output to produce a third output occupying the regular band and the extended band. | 01-30-2014 |
| 20140093246 | METHOD OF CONFIGURING AN OPTICAL PATH, A PATH COMPUTATION ENGINE AND AN OPTICAL COMMUNICATIONS NETWORK NODE - A method of configuring an optical path, comprising: selecting a path from a first to a second node in an optical communications network; identifying each wavelength that may be used continuously across the path and selecting a transmission wavelength for the optical path one of the identified wavelengths for which: a fixed wavelength direction-bound add/drop transponder add operable at said wavelength is available at each node; if that first requirement is not met, a fixed wavelength direction-bound add/drop transponder or a fixed wavelength directionless add/drop transponder operable at said wavelength is available at each node; and if that second requirement is not met, a tunable wavelength direction-bound add/drop transponder or a tunable wavelength directionless add/drop transponder operable at said wavelength is available at each node. | 04-03-2014 |
| 20140147121 | OPTICAL DROP APPARATUS, OPTICAL ADD APPARATUS, AND OPTICAL ADD/DROP APPARATUS - Provided is an optical apparatus including: wavelength separation units corresponding to the respective routes, each of which divides a wavelength multiplexed optical signal of one route into M wavelength groups (M is an integer satisfying N×M=the number of multiplexed wavelengths of the wavelength multiplexed optical signal of one route), each of which includes N wavelengths (N is an integer of 2 or more); and M wavelength separation blocks, each of which is input with a plurality of the wavelength groups divided by the different wavelength separation units and outputs optical signals with any one or a plurality of wavelengths included in the input wavelength groups to N coherent transponders. Accordingly, it is possible to flexibly adapt to extension in wavelength or extension in route in units of a wavelength separation block and/or wavelength multiplexing block. | 05-29-2014 |
| 20140161462 | Method, Apparatus and System for Processing Flexible-Rate Signal - The present invention relates to a method, an apparatus, and a system for processing a flexible-rate signal. A signal from a client side is encapsulated to n optical channel data unit ODU signals. The n ODU signals are encapsulated to a flexible optical channel transport unit OTU signal. A nominal bit rate of the flexible OTU signal varies according to a value of n and the n is an integer greater than or equal to 1. | 06-12-2014 |
| 20140193156 | OPTICAL NETWORK APPARATUS FOR SELF-SEEDED COMMUNICATIONS - Optical network apparatus comprises an optical add drop multiplexer ( | 07-10-2014 |
| 20140255035 | OPTICAL SIGNAL TRANSMISSION METHOD, APPARATUS AND SYSTEM - An optical signal transmission method includes: obtaining a signal identifier of data to be sent; obtaining corresponding optical frequency slot distribution information according to the signal identifier; and determining a corresponding carrier according to the obtained optical frequency slot distribution information, using the determined carrier to carry the data to be sent to generate an optical signal, and sending the generated optical signal. The optical signal transmission method provided in the present invention does not fix the optical frequency slot distribution into a wavelength identifier, the number of optical frequency slots is not limited by the wavelength identifier field length, and the data to be sent can be transmitted in an optical network by being carried on the carrier determined according to multiple optical frequency slots. | 09-11-2014 |
| 20140270781 | OPTICAL SIGNAL DEMODULATOR, OPTICAL SIGNAL DEMODULATING METHOD, AND OPTICAL ADD-DROP MULTIPLEXER - An optical signal demodulator includes: an obtaining unit configured to obtain a spectrum of an optical signal generated by a second signal being superimposed on a first signal using frequency modulation; an identifying unit configured to identify a peak wavelength which is a wavelength corresponding to a peak position of the spectrum; and a demodulating unit configured to demodulate the second signal from the optical signal using a wavelength-variable filter to which a transmitted wavelength band has been set based on the peak wavelength. | 09-18-2014 |
| 20140294394 | OPTICAL COMMUNICATION APPARATUS AND OPTICAL COMMUNICATION METHOD - An optical communication apparatus and an optical communication method are disclosed. An optical communication apparatus mounted in a first node in a linear network coupled among a plurality nodes through an optical transmission line includes a multiplexer for receiving a plurality of optical signals having different wavelengths to output a first multi-wavelength optical signal obtained by coupling the plurality of optical signals, and a first optical coupler for dividing the first multi-wavelength optical signal into respective multi-wavelength optical signals to be transmitted to at least two different neighboring nodes. | 10-02-2014 |
| 20140376918 | METHOD AND APPARATUS FOR CONSTRUCTION OF COMPACT OPTICAL NODES USING WAVELENGTH EQUALIZING ARRAYS - Example embodiments of the present invention relate to An optical node comprising of at least two optical degrees; a plurality of directionless add/drop ports; and at least one wavelength equalizing array, wherein the at least one wavelength equalizing array is used to both select wavelengths for each degree, and to perform directionless steering for the add/drop ports. | 12-25-2014 |
| 20150043920 | SUBMARINE RECONFIGURABLE OPTICAL ADD/DROP MULTIPLEXER WITH PASSIVE BRANCHING UNIT - Systems and methods for data transport, including submarine reconfigurable optical add/drop multiplexers, branching units configured to receive signals from trunk terminals (TTs), and dummy light filters configured to pass useful signals through the filters, and to reflect dummy light. Optical interleavers are configured to separate useful signals into two or more groups of optical channels, and the optical channels are set to a frequency of either a left or a right portion of a total channel bandwidth. De-interleavers merge signal groups together from trunk terminals, and lasers at each of the transponders at the source terminals are configured to adjust a destination of a channel by fine tuning a frequency or wavelength of the one or more signals. | 02-12-2015 |
| 20150063816 | METHOD AND APPARATUS FOR VISUALLY INDICATING CONNECTIONS BETWEEN MULT-WAVELENGTH INTERFACES AND UNI-WAVELENGTH INTERFACES - A method and apparatus for visually indicating the connections between optical interfaces is provided. The optical interfaces may include multi-wavelength optical interfaces and uni-wavelength optical interfaces. The optical interfaces may reside within optical nodes contained within an optical network. | 03-05-2015 |
| 20150139654 | POST-TRANSIENT GAIN CONTROL OF OPTICAL AMPLIFIERS - Methods and systems for post-transient gain control of optical amplifiers may include using a gain offset control module in an optical amplifier to generate a gain offset cancelling signal. The gain offset cancelling signal may be output to a gain control module in the optical amplifier to generate at least one of a pump signal and an attenuation control signal. In this manner, a gain offset may be cancelled for a plurality of wavelengths in an optical signal transmitted by an optical network. | 05-21-2015 |
| 20150295674 | OPTICAL BRANCHING UNIT AND OPTICAL BRANCHING METHOD - In order to allow for a flexible network configuration and establish an alternative path without performing communication between optical branching units in the event of a failure on a path in an optical communication system to which a plurality of optical branching units are connected, the optical branching unit includes optical add-drop unit for outputting an input WDM signal to any of a plurality of paths on a per-wavelength basis, light wavelength detecting unit for detecting a wavelength of the input WDM signal, a wavelength database storing, on a per-wavelength basis, information about sections through which optical signals contained in the WDM signal pass, and control unit for changing a setting of the optical add-drop unit so that a path of an optical signal of a wavelength passing through a particular one of the sections bypasses the particular section when all wavelengths stored in the wavelength database are not detected in the particular section by the light wavelength detecting unit. | 10-15-2015 |
| 20150311996 | SYSTEMS AND METHODS FOR GLOBAL SPECTRAL EQUALIZATION - Systems and methods are disclosed for global spectral equalization. For example, a global spectral equalization method is disclosed that includes computing a reconfigurable optical add-drop multiplexer attenuation vector sum. The method also includes computing a residual tilt based on a level of channel warping. In addition, the method also includes computing an unnecessary attenuation based on the attenuation vector sum and the residual tilt. In addition, the method also includes distributing attenuation adjustment to nodes between a receiver and a transmitter based on the unnecessary attenuation. | 10-29-2015 |
| 20150341135 | FLEXIBLE CHANNEL COORDINATION FOR MULTIPLE OPTICAL CARRIER OPTICAL NETWORKS - One or more management systems coordinate wavelength configuration patterns of a plurality of multi-wavelength optical transport nodes in an optical network for a first transport period. The one or more management systems determine data traffic demand changes in the optical network; and coordinate wavelength configuration patterns of the plurality of multi-wavelength optical transport nodes in the optical network for a second transport period, that is subsequent to the first transport period, based on the determined data traffic demand changes. | 11-26-2015 |
| 20150364896 | TRANSIENT GAIN CANCELLATION FOR OPTICAL AMPLIFIERS - Methods and systems for transient gain cancellation at an optical amplifier may involve generating saturating light that is introduced in a reverse direction to a transmission direction at a doped fiber amplification element. The doped fiber amplification element may amplify an input optical signal having a plurality of wavelengths as well as the saturating light. The saturating light may be regulated by a control circuit to counteract transient gain effects of add/drop events in the input optical signal. The saturated light may be filtered to achieve a desired spectral profile. | 12-17-2015 |
| 20150381302 | TELECOMMUNICATIONS NETWORK NODE LINKING A METROPOLITAN AREA NETWORK WITH AT LEAST ONE ACCESS NETWORK - The telecommunications network node linking a metropolitan area network, including at least one optical link connecting the nodes, with at least one access network, includes an electronic card that enables the aggregation of traffic from multiple access networks, a transmitter capable of receiving an electrical signal from the electronic card and of transmitting an optical packet to the metropolitan area network, a circulator capable of extracting a stream of multiplexed optical packets from the optical link and of inserting a stream of multiplexed optical packets into the optical link, and a reflective switching matrix receiving a stream of multiplexed optical packets from among which it selects and detects those intended for the access network. The reflective switching matrix includes a POADM optical packet add/drop multiplexer that receives multiplexed optical packets and transmits demultiplexed optical packets, and at least one RSOA reflective semiconductor optical amplifier capable of receiving a demultiplexed optical packet, which includes three sections. | 12-31-2015 |
| 20160006536 | SIGNAL PROCESSING METHOD AND BIDIRECTIONAL CWDM RING NETWORK SYSTEM FOR THE SAME - The present disclosure relates to a signal processing method and a bidirectional coarse wavelength division multiplexing (CWDM) ring network system allocating at least two wavelength channels per a single wavelength grid to thereby increase the numbers of wavelength channels. The bidirectional CWDM ring network system is configured to form an optical signal having specific wavelength; allocate at least two wavelength channels per a single CWDM wavelength grid; and add an optical signal having specific wavelength to the optical signal formed in at least two the optical transceivers or drop an optical signal having specific wavelength to the optical signal formed at the at least two optical transceivers. | 01-07-2016 |
| 20160050043 | APPARATUSES, SYSTEMS, METHODS, AND COMPUTER PROGRAM PRODUCTS FOR ADD-DROP MULTIPLEXING - A network element includes first and second multiplexers, first and second interfaces, and first and second selecting units. The multiplexers are communicatively coupled. The first interface is communicatively coupled to the first multiplexer and configured to receive multiplexed signals. The second interface is communicatively coupled to the second multiplexer and configured to receive multiplexed signals. The first selecting unit is communicatively coupled to the first and second multiplexers and configured to select between a signal received from the first multiplexer and a signal received from the second multiplexer. The second selecting unit is also communicatively coupled to the first and second multiplexers and configured to select between a signal received from the first multiplexer and a signal received from the second multiplexer. | 02-18-2016 |
| 20160094304 | Optical Line Loading Using Variable Bandwidth Noise - An apparatus is provided that includes an optical noise generator and a noise combiner. The noise generator is configured to produce an optical signal having a noise channel. The noise combiner is configured to combine an optical data channel with the noise channel received at one or more add ports to produce an optical output signal. A controller is configured to operate the noise generator or the noise combiner to provide a variable bandwidth of added noise combined with the optical data channel. | 03-31-2016 |
| 20160191192 | ASSEMBLY OF STANDARD DWDM DEVICES FOR USE ON FREE-SPACE MULTIPORT DWDM DEVICES - The invention teaches the design and assembly configurations for a free space DWDM device. Particularly, when using the free space DWDM devices for channel spacing less than 200 GHz, a small angle of incidence requires a longer optical path and adjustments must be made by folding the optical path or using double layers of optical components such as collimators to shorten the device and obtain the compact dimensions of the DWDM device. The design of the compact optical devices are implemented and assembled with various positioning and mounting methods for the newly designed optical base member, collimators, and filters to obtain the desired compact free space DWDM devices | 06-30-2016 |
| 20160197695 | Optical Signal Processing Device | 07-07-2016 |
| 20160197696 | TRANSPORT APPARATUS, TRANSPORT SYSTEM, TRANSPORT METHOD, AND STORAGE MEDIUM ON WHICH PROGRAM HAS BEEN STORED | 07-07-2016 |
| 20170237517 | OPTICAL ADD/DROP MULTIPLEXER AND OPTICAL NETWORK SIGNAL TRANSMISSION METHOD | 08-17-2017 |
| 20190149258 | TRANSMISSION AND RECEPTION APPARATUS, OPTICAL TRANSMISSION APPARATUS AND OPTIMIZATION METHOD FOR PLUGGABLE INTERFACE | 05-16-2019 |
| 20190149259 | OPTICAL TRANSMISSION SYSTEM, METHOD FOR ANALYZING THEREOF, TERMINAL STATION DEVICE, AND MANAGEMENT DEVICE | 05-16-2019 |
