Patent application number | Description | Published |
20090022497 | HIGH-SPEED OPTICAL TRANSCEIVER FOR INFINIBAND AND ETHERNET - The present invention provides a high-speed 100G optical transceiver for InfiniBand and Ethernet with associated mapping to frame InfiniBand and Ethernet into GFP-T. The optical transceiver utilizes an architecture which relies on standards-compliant (i.e., multi-sourced) physical client interfaces. These client interfaces are back-ended with flexible, programmable Field Programmable Gate Array (FPGA) modules to accomplish either InfiniBand or Ethernet protocol control, processing, re-framing, and the like. Next, signals are encoded with Forward Error Correction (FEC) and can include additional Optical Transport Unit (OTU) compliant framing structures. The resulting data is processed appropriately for the subsequent optical re-transmission, such as, for example, with differential encoding, Gray encoding, I/Q Quadrature encoding, and the like. The data is sent to an optical transmitter block and modulated onto an optical carrier. Also, the same process proceeds in reverse on the receive side. | 01-22-2009 |
20090103931 | SYSTEMS AND METHODS FOR THE COHERENT NON-DIFFERENTIAL DETECTION OF OPTICAL COMMUNICATION SIGNALS - In various exemplary embodiments, the present invention provides coherent non-differential detection systems and methods for the detection of optical communication signals by the Brillouin fiber amplification of an optical communication signal carrier, the coherent non-differential detection systems including: a Sagnac loop including a single-mode fiber span; a fiber span with negligible birefringence (i.e. a spun fiber span or the like); or a fiber loop with negligible birefringence (i.e. a spun fiber loop or the like). | 04-23-2009 |
20090147896 | SERIALIZER-DESERIALIZER CIRCUIT WITH MULTI-FORMAT AND MULTI-DATA RATE CAPABILITY - The present invention provides a serializer/deserializer (SERDES) circuit that can cover both client- and network-side interfaces for high-speed data rates. The present invention leverages commonality between the client and network (also known as line) side, and accommodates differences in a flexible manner. In one exemplary embodiment, the present invention provides a four-channel implementation to meet the requirement of both interfaces. The SERDES circuit can be capable of supporting both 40 Gb/s and 56 Gb/s data rates, can include an integrated DQPSK pre-coder and I/Q input/output signals, and can support RZ clock recovery. Additionally, the SERDES circuit can include differential coding support, electronic pre-emphasis, receiver-side electronic dispersion compensation, and the like. | 06-11-2009 |
20090154941 | SYSTEMS AND METHODS FOR COMMUNICATION SYSTEM CONTROL UTILIZING CORRECTED FORWARD ERROR CORRECTION ERROR LOCATION IDENTIFIERS - The present invention provides systems and methods for communication system control utilizing corrected forward error correction (FEC) error location identifiers in multi-level modulation scheme systems. The present invention utilizes precise error correction information, available for each FEC block of a particular code (including, but not limited to, block codes and concatenated block codes employing iterative decoding as well as convolutional codes (including turbo codes) and low-density parity-check code (LDPC) class codes) used (e.g., Bose, Ray-Chaudhuri, Hocquenghem (BCH), Reed-Solomon, etc.), as a result of the FEC decoding process to provide feedback to close the loop for control of a demodulator (i.e., receiver). Each error location can be uniquely traced back to a particular sub-rate signal path, with running, post-FEC corrected BER (bit error rate) calculations generated on each sub-rate signal. Advantageously, this provides the ability to adjust thresholds and various other parameters to achieve and maintain error-free operation quickly. | 06-18-2009 |
20090232492 | DIRECTIONLESS OPTICAL ARCHITECTURE AND HIGHLY AVAILABLE NETWORK AND PHOTONIC RESILIENCE METHODS - The present invention provides a directionless optical architecture for reconfigurable optical add/drop multiplexers (ROADMs) and wavelength selective switches (WSSs). The directionless architecture utilizes a directionless wavelength switch coupled between client devices and ROADMs/WSSs to eliminate the need to hard-wire client devices to a wavelength division multiplexed (WDM) network. Accordingly, client device connections can be automatically routed without manual intervention to provide a highly resilient network design which can recover route diversity during failure scenarios. Additionally, the present invention minimizes deployments of costly optical transceivers while providing superior resiliency. Further, the present invention couples the directionless optical architecture and associated optical protection mechanisms with existing mesh restoration schemes to provide additional resiliency. | 09-17-2009 |
20090232497 | DIRECTIONLESS RECONFIGURABLE OPTICAL ADD-DROP MULTIPLEXER SYSTEMS AND METHODS - The present invention provides a directionless reconfigurable optical add/drop multiplexer (ROADM) system. The present invention provides a scalable all-optical switching element that includes a combination of 1×N wavelength selective switches (WSS), 1×N splitters/combiners, optical amplifiers, and tunable filters to provide a fully non-blocking solution which can be deployed in a scalable manner. The 1×N splitters are configured to split multiples copies of a plurality of drop wavelengths which can be amplified and sent to a tunable filter which selects out a particular wavelength for drop. The 1×N combiners are configured to combine multiple add wavelengths for egress transmission. | 09-17-2009 |
20090279900 | SYSTEMS AND METHODS FOR THE MITIGATION OF POLARIZATION MODE DISPERSION IMPAIRMENTS IN FIBER OPTIC LINKS - The present invention provides systems and methods for the mitigation of PMD impairments in fiber optic links. The present invention utilizes synchronous polarization modulation and digital control of polarization modulation, instead of independent polarization modulators and analog control used in the current state of art. Also, the present invention utilizes a feedback loop to avoid identified bad polarization states instead of a random open loop operation. Further, the present invention includes a mechanism to continually update polarization states based on pre-corrected FEC error analysis from data receivers. Additionally, the present invention includes a mechanism for collecting and correlating error feedback signals from multiple geographically-diverse network nodes. Advantageously, the present invention provides a cost-effective and efficient way to implement mitigation of PMD impairments, while using only a small fraction of the FEC error correction capability. | 11-12-2009 |
20100008617 | METHODS AND SYSTEMS FOR ELIMINATING DELETERIOUS POLARIZATION EFFECTS IN AN OPTICAL FIBER DISPERSION COMPENSATION MODULE - The present invention provides methods and systems for mitigating polarization changes associated with an optical communication signal caused by mechanical disturbances to an optical fiber dispersion compensation module of an optical communication network. The methods include disposing a first damping material between an optical fiber and a housing associated with the optical fiber dispersion compensation module; wherein the first damping material is selected and positioned such that it mitigates relatively fast polarization changes. Optionally, the methods also include disposing a second damping material between the optical fiber and the housing associated with the optical fiber dispersion compensation module; wherein the second damping material is selected and positioned such that it mitigates relatively slow polarization changes. Thus, frequency range specific optical fiber dispersion compensation module mechanical perturbation isolation methods and systems are provided. | 01-14-2010 |
20100142943 | DYNAMIC PERFORMANCE MONITORING SYSTEMS AND METHODS FOR OPTICAL NETWORKS - The present disclosure provides dynamic performance monitoring systems and methods for optical networks to ascertain optical network health in a flexible and accurate manner. The present invention introduces accurate estimations for optical channel performance characteristics based either on existing channels or with a dynamic optical probe configured to measure characteristics on unequipped wavelengths. Advantageously, the dynamic performance monitoring systems and methods introduce the ability to determine physical layer viability in addition to logical layer viability. | 06-10-2010 |
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 |
20100329694 | ELECTRICAL DOMAIN SUPPRESSION OF LINEAR CROSSTALK IN OPTICAL COMMUNICATION SYSTEMS - The present disclosure provides electrical domain suppression of linear crosstalk in optical communication systems using single-carrier implementations. This electrical domain suppression applies spectral shaping in the electronic radio frequency (RF) domain. Advantageously, spectral shaping in the electronic RF domain transfers system complexity from the bulk optical domain into the highly integrated CMOS (or equivalent) domain. The spectral shaping can include electronic circuitry including an electrical filtering block and a signal linearization block prior to optical modulation. The electrical filtering block suppresses coherent interference terms and can include an RF-domain low pass filter. The signal linearization block linearizes modulator response to compensate spectral regrowth due to nonlinear mixing in the modulator. | 12-30-2010 |
20110013911 | HIGH-SPEED OPTICAL TRANSPONDER SYSTEMS - The present disclosure provides high-speed wavelength division multiplexing (WDM) transponders (e.g., 10 Gb/s, 40 Gb/s, 100 Gb/s, and beyond) that receive one or more optical signals and convert and/or remodulate the received optical signals onto a newly generated optical channel along with overhead processing/addition, forward error correction, and the like. In general, the transponders of the present invention include a client-side and a line-side, each with bi-directional optical transmission. The transponders provide an effective mechanism to support WDM networks that are transparent to the client-side. | 01-20-2011 |
20110033195 | POLARIZATION DIVERSITY RECEIVER SYSTEMS AND METHODS WITH POLARIZATION MODE DISPERSION MITIGATION - The present disclosure relates to polarization diversity receiver systems and methods with polarization mode dispersion mitigation through processing. Specifically, the present invention includes a direct-detection receiver system that removes the requirement for a LO and an ADC thereby improving power, size, and cost over existing solutions, while at the same time allowing sufficient electronic processing to mitigate PMD impairment. The present invention can be realized in a processing block in CMOS technology front-ended with a polarization diversity receiver utilizing a 90 deg. optical hybrid. | 02-10-2011 |
20110176815 | MULTI-CHANNEL OPTICAL TRANSCEIVER WITH OFFSET QUADRATURE AMPLITUDE MODULATION - The present disclosure provides a multi-carrier optical transmitter, receiver, transceiver, and associated methods utilizing offset quadrature amplitude modulation thereby achieving significant increases in spectral efficiency, with negligible sensitivity penalties. In an exemplary embodiment, an optical transmitter includes circuitry configured to generate a plurality of optical subcarriers, a plurality of data signals for each of the plurality of subcarriers, and a plurality of modulator circuits for each of the plurality of subcarriers, wherein each of the plurality of modulator circuits includes circuitry configured to offset an in-phase component from a quadrature component of one of the plurality data signals by one-half baud period. | 07-21-2011 |
20110255870 | OPTICAL TRANSCEIVERS FOR USE IN FIBER OPTIC COMMUNICATION NETWORKS - The present disclosure provides a polarization multiplexed transceiver, including: a transmitter; a receiver; circuitry within the transmitter configured to insert pilot tones as a reference state of polarization for a polarization multiplexed signal; and circuitry within the receiver configured to de-multiplex the polarization multiplexed signal using the pilot tones. The transmitted signal is constructed in such a manner as to facilitate the division of the receiver processing between the analog and digital domains such that the implementation may be simultaneously both highly spectrally efficient and power efficient. | 10-20-2011 |
20120039606 | LOW POWER OPTICAL TRANSCEIVER USING ORTHOGONAL POLARIZATION DETECTION TECHNIQUE - A method and apparatus for simultaneous processing of signals impressed on a horizontal polarization of a light wave and on a vertical polarization of the light wave is provided. In one embodiment, a horizontal polarization pilot tone is impressed on a data signal carried by the horizontal polarization and a vertical polarization pilot tone is impressed on a data signal carried by the vertical polarization. A receiver processes the dual-polarized light wave and converts it to an X channel signal and a Y channel signal. The X and Y channel signals are processed in separate channels to recover a phase and frequency offset between them and a local oscillator. The phase and frequency recovered and frequency de-multiplexed signals are further processed to polarization de-multiplex the data signal carried by the horizontal polarization and the data signal carried by the vertical polarization. | 02-16-2012 |
20120183092 | ANALOG CONTINUOUS TIME MATCHED PULSE SHAPING TRANSMITTER AND RECEIVER FILTERS - The present invention provides a transmission system, including: a transmitter including a transmitter filter; a receiver including a receiver filter; and a communicative coupling between the transmitter and the receiver; wherein the transmitter filter and the receiver filter are matched for noise reduction, and wherein the combined responses of the transmitter filter and the receiver filter satisfy the Nyquist criteria. Optionally, the transmitter filter includes a pulse shaping quasi digital finite impulse response filter. Optionally, the receiver filter includes an inductor-capacitor ladder based filter. | 07-19-2012 |
20130128330 | FIBER OPTICAL PACKAGE INTERCONNECT - Optical devices and systems including a polarization maintaining interconnect are disclosed. An optical assembly can include an optical component, a low-birefringence optical fiber and a polarization transformer. The polarization transformer is coupled between the optical component and the optical fiber. The polarization transformer is configured to transform between a substantially circularly-polarized light at the low-birefringence optical fiber and a substantially linearly-polarized light at the optical component. | 05-23-2013 |
20130148192 | DIFFERENTIATION OF POWER AND CHANNEL COUNT CHANGES IN OPTICALLY AMPLIFIED LINKS - Exemplary embodiments of the invention are drawn to a method and apparatus for the differentiation of power and channel count changes in optically amplified links. Additionally, configuration of a corresponding optical amplifier can be based on the determination of the power and channel count changes. | 06-13-2013 |
20130209091 | HIGH SPEED OPTICAL COMMUNICATION SYSTEMS AND METHODS WITH FLEXIBLE BANDWIDTH ADAPTATION - A fiber optic system includes a transmitter configured to utilize a plurality of modulation formats and a receiver communicatively coupled to the transmitter and configured to utilize a plurality of modulation formats. The transmitter and the receiver are cooperatively configured to set a modulation format of the plurality of modulation formats based upon optical signal-to-noise ratio associated therewith. A flexible bandwidth adaptation method includes monitoring at least one aspect of an optical link at a network element, responsive to the at least one aspect, computing a new modulation scheme for the optical link, and, if a solution is found for the new modulation scheme, changing to the new modulation format. | 08-15-2013 |
20130236169 | COHERENT PROBE AND OPTICAL SERVICE CHANNEL SYSTEMS AND METHODS FOR OPTICAL NETWORKS - The present disclosure provides dynamic performance monitoring systems and methods for optical networks to ascertain optical network health in a flexible and accurate manner. The present invention introduces accurate estimations for optical channel performance characteristics based either on existing channels or with a dynamic optical probe configured to measure characteristics on unequipped wavelengths. Advantageously, the dynamic performance monitoring systems and methods introduce the ability to determine physical layer viability in addition to logical layer viability. | 09-12-2013 |
20130287397 | ELECTRO-OPTICAL SWITCHING FABRIC SYSTEMS AND METHODS - An optical switch fabric, including: a first set of horizontal optical waveguides receiving a plurality of wavelengths; a plurality of wavelength-selective drop optical switches associated with the first set of horizontal optical waveguides, wherein the plurality of wavelength-selective drop optical switches are each configured to drop a selected wavelength from a horizontal optical waveguide of the first set of horizontal optical waveguides to an associated vertical optical waveguide of a plurality of vertical optical waveguides; and a plurality of controllable optical switches associated with the plurality of vertical optical waveguides, wherein the plurality of controllable optical switches are each configured to direct a selected wavelength from a vertical optical waveguide of the plurality of vertical optical waveguides to a horizontal optical waveguide of a second set of horizontal optical waveguides, and wherein the second set of horizontal optical waveguides output a plurality of wavelengths. | 10-31-2013 |
20130287398 | MULTI-CHANNEL OPTICAL TRANSCEIVER WITH OFFSET QUADRATURE AMPLITUDE MODULATION - The present disclosure provides a multi-carrier optical transmitter, receiver, transceiver, and associated methods utilizing offset quadrature amplitude modulation thereby achieving significant increases in spectral efficiency, with negligible sensitivity penalties. In an exemplary embodiment, an optical transmitter includes circuitry configured to generate a plurality of optical subcarriers, a plurality of data signals for each of the plurality of subcarriers, and a plurality of modulator circuits for each of the plurality of subcarriers, wherein each of the plurality of modulator circuits includes circuitry configured to offset an in-phase component from a quadrature component of one of the plurality data signals by one-half baud period. | 10-31-2013 |
20140050476 | SYSTEMS AND METHODS FOR THE COMPENSATION OF NONLINEAR CROSS POLARIZATION AND CROSS PHASE MODULATION IN DUAL POLARIZATION COHERENT CHANNELS - The present disclosure provides systems and methods for the compensation of signal distortion in fiber optic communication systems and the like. More specifically, the present disclosure provides an orthogonal polarization detection and broadband pilot (OPDBP) technique for the compensation of nonlinear cross polarization (i.e. nonlinear cross polarization modulation) (XPolM) induced noise and nonlinear nonlinear cross phase modulation (XPM) induced noise in a high data rate polarization multiplexed (PM) multilevel-quadrature amplitude modulated (M-QAM) channel due to neighboring channels. This approach allows for the compensation of both XPolM and XPM simultaneously, providing several dBs of optical reach extension. The approach uses a pilot tone based orthogonal polarization detection scheme with broadband (i.e. a few GHz wide) filtering of the pilot tones. | 02-20-2014 |
20140064102 | SYSTEMS AND METHODS FOR NOISE TOLERANT SIGNAL PROCESSING IN PILOT ASSISTED DATA RECEIVERS - The present disclosure provides systems and methods for noise tolerant signal processing in a pilot assisted data receiver, including: given received pilots with common pilot components and individual pilot components, computing coefficients associated with the individual pilot components of the received pilots; and applying the computed coefficients to the received pilots to obtain conditioned pilots. The individual pilot components result from relatively slow changes of the received pilots relative to the common pilot components. The common pilot components result from relatively fast changes of the received pilots relative to the individual pilot components. | 03-06-2014 |
20140312931 | SYSTEM AND METHOD FOR STATIONARY FINITE IMPULSE RESPONSE FILTERS IN PROGRAMMABLE MICROELECTRONIC CIRCUITS - A Field Programmable Gate Array (FPGA) to implement channel equalization to mitigate group velocity dispersion in an optical system. In one embodiment, a mapping is loaded into the FPGA whereby the in-phase and quadrature components of the baseband sequence to be filtered are routed to accumulators to form various sums, where each sum is multiplied by a corresponding distinct filter tap coefficient value according to the mapping to form various products, and where the products are summed to provide the in-phase and quadrature components of the filtered output. | 10-23-2014 |
20140348504 | DIRECTIONLESS OPTICAL ARCHITECTURE AND HIGHLY AVAILABLE NETWORK AND PHOTONIC RESILIENCE METHODS - A directionless optical architecture is described for reconfigurable optical add/drop multiplexers (ROADMs) and wavelength selective switches (WSSs). The directionless architecture utilizes a directionless wavelength switch coupled between client devices and ROADMs/WSSs to eliminate the need to hard-wire client devices to a wavelength division multiplexed (WDM) network. Accordingly, client device connections can be automatically routed without manual intervention to provide a highly resilient network design which can recover route diversity during failure scenarios. Additionally, the present invention minimizes deployments of costly optical transceivers while providing superior resiliency. Further, the present invention couples the directionless optical architecture and associated optical protection mechanisms with existing mesh restoration schemes to provide additional resiliency. | 11-27-2014 |
20140369686 | SYSTEMS AND METHODS FOR NOISE TOLERANT SIGNAL PROCESSING IN PILOT ASSISTED DATA RECEIVERS - The present disclosure provides systems and methods for noise tolerant signal processing in a pilot assisted data receiver, including: given received pilots with common pilot components and individual pilot components, computing coefficients associated with the individual pilot components of the received pilots; and applying the computed coefficients to the received pilots to obtain conditioned pilots. The individual pilot components result from relatively slow changes of the received pilots relative to the common pilot components. The common pilot components result from relatively fast changes of the received pilots relative to the individual pilot components. | 12-18-2014 |
20140376917 | SYSTEMS AND METHODS FOR THE COMPENSATION OF NONLINEAR CROSS POLARIZATION AND CROSS PHASE MODULATION IN DUAL POLARIZATION COHERENT CHANNELS - The present disclosure provides systems and methods for the compensation of signal distortion in fiber optic communication systems and the like. More specifically, the present disclosure provides an orthogonal polarization detection and broadband pilot (OPDBP) technique for the compensation of nonlinear cross polarization (i.e. nonlinear cross polarization modulation) (XPolM) induced noise and nonlinear nonlinear cross phase modulation (XPM) induced noise in a high data rate polarization multiplexed (PM) multilevel-quadrature amplitude modulated (M-QAM) channel due to neighboring channels. This approach allows for the compensation of both XPolM and XPM simultaneously, providing several dBs of optical reach extension. The approach uses a pilot tone based orthogonal polarization detection scheme with broadband (i.e. a few GHz wide) filtering of the pilot tones. | 12-25-2014 |
20150030337 | HIGH-SPEED OPTICAL TRANSCEIVER FOR INFINIBAND AND ETHERNET - The present invention provides a high-speed 100 G optical transceiver for InfiniBand and Ethernet with associated mapping to frame InfiniBand and Ethernet into GFP-T. The optical transceiver utilizes an architecture which relies on standards-compliant (i.e., multi-sourced) physical client interfaces. These client interfaces are back-ended with flexible, programmable Field Programmable Gate Array (FPGA) modules to accomplish either InfiniBand or Ethernet protocol control, processing, reframing, and the like. Next, signals are encoded with Forward Error Correction (FEC) and can include additional Optical Transport Unit (OTU) compliant framing structures. The resulting data is processed appropriately for the subsequent optical re-transmission, such as, for example, with differential encoding, Gray encoding, I/Q Quadrature encoding, and the like. The data is sent to an optical transmitter block and modulated onto an optical carrier. Also, the same process proceeds in reverse on the receive side. | 01-29-2015 |
20150075957 | HIGH VOLTAGE CONTROL WITH DIGITAL MEMS LOGIC - A complex logic gate comprising digital MEM switches, coupled to a high voltage MEMS buffer, to provide a high voltage depending upon gate and body voltages of the digital MEM switches. | 03-19-2015 |
20150076923 | SYSTEMS AND METHODS FOR MEMS-BASED CROSS-POINT ELECTRICAL SWITCHING - A Microelectromechanical systems (MEMS)-based N×M cross-point switch, a MEMS-based system, and a method provide MEMS-based cross-point electrical switching for a Layer 0 flow-based switch. The N×M cross-point switch includes N inputs each at least 10 Gbps, M output each at least 10 Gbps, a plurality of Radio Frequency (RF) MEMS switches selectively interconnecting the N inputs to the M outputs; and control and addressing circuitry to selectively control the plurality of RF MEMS switches to switch each of the N inputs to a corresponding output of the M outputs. The systems and methods provide an electrical switching fabric for flow-based switching of wavelengths that can be part of a Reconfigurable Electrical Add/Drop Multiplexer (READM) with similar functionality as a ROADM in the electronic domain. | 03-19-2015 |