Patent application number | Description | Published |
20100034533 | WAVELENGTH DIVISION MULTIPLEXER AND REGENERATIVE REPEATING METHOD IN WAVELENGTH DIVISION MULTIPLEXING NETWORK - Disclosed is transponder (optical transmitter/receiver) that has a switch, which switches on and off the loopback of an optical path, to allow the same transponder to implement the transmission/reception end function on an optical path, and the regenerative repeating function at an intermediate point on an optical path. When a new optical path is built, the assignment of the wavelength and the allocation of the incoming and outgoing paths for transmission/reception are set remotely. ( | 02-11-2010 |
20100260500 | MULT9-DEGREE WAVELENGTH CROSS-CONNECT USING BIDIRECTIONAL WAVELENGTH SELECTIVE SWITCH - A modular wavelength cross connect node for use in a dense wavelength division multiplexing network exhibiting low cost and improved performance by employing a bidirectional wavelength selective switch in a main optical path and using optical circulators to share any common ports. | 10-14-2010 |
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 |
20120251117 | Method for Traffic Grooming, Wavelength Assignment and Spectrum Allocation - A method includes determining a line rate selection for a flexible optical wavelength-division-multiplexing WDM network, determining a traffic routing in said network, and determining simultaneously a channel routing, wavelength assignment and spectrum allocation in said network based on an auxiliary graph. | 10-04-2012 |
20130077963 | Method for the Compensation of Nonlinear Impairments in Dispersion-Managed Optical Fiber Links Using Phase Conjugation and Equivalent Optical Link - A method for nonlinearity compensation for an optical transmission link includes determining a dispersion effect of a transmission link; applying a phase conjugation to the transmission link, the phase conjugation responsive to an input wave over the transmission link and providing a conjugated version of the input wave; and configuring an optimum equivalent link responsive to the phase conjugation after the transmission link to compensate for a non-linear dispersion effect from said transmission link | 03-28-2013 |
20130089323 | Optimal Combined 2R/3R Regenerators Placement Method for Line Network Topologies in Optical WDM Networks - A method for optimal combined 2R/3R regenerators placement for optical transmission includes determining an optimal placement of multiple 2R and 3R regenerators that minimizes bit error rate BER at a destination node, determining an optimal number of the 2R and 3R regenerators that minimizes a total cost while satisfying the BER at the destination node, and determining an optimal placement of the 2R and 3R regenerators along a route in the optical transmission. | 04-11-2013 |
20130170825 | Solution for Hitless Protection in High-Speed OTN Framer and Front-End - In an optical communication system containing a primary line and backup line card, a method includes providing interfaces for the primary and backup line card, each line card including a transmitter and receiver; and selecting output from the transmitter from either the primary or back up line card including selecting the backup line card when the primary line card encounters a failure. | 07-04-2013 |
20130216224 | Joint Optimization Procedure for Routing and Wavelength Assignment with Combined Dedicated Shared Protections in Multi-Cable Multi-Fiber Optical WDM Networks - A joint-optimization method addresses the generalized routing and wavelength assignment problem with variable number of combined 1+1 dedicated and shared connections. The inventive method enables a solution in time that is polynomial of the input size. Thus, the time complexity of the joint-optimization method is significantly less than that of existing methods. | 08-22-2013 |
20130216225 | 2-Step-Optimization Procedure for Routing and Wavelength Assignment with Combined Dedicated Shared Protections in Multi-Cable Multi-Fiber Optical WDM Networks - The inventive 2-step-optimization procedure that addresses the generalized routing and wavelength assignment problem with variable number of combined 1+1 dedicated and shared connections for the first time. The proposed procedure results a solution in time that is polynomial of the input size. Thus, the time complexity of the 2-step-optimization procedure is significantly less than that of existing methods. | 08-22-2013 |
20130259474 | TRANSPONDER AGGREGATOR-BASED OPTICAL LOOPBACK IN A MD-ROADM - The present principles are directed to a transponder aggregator-based optical loopback in a multi-degree colorless, directionless, contention-less, reconfigurable optical add/drop multiplexer. The multiplexer includes a reconfigurable optical add/drop multiplexer section for performing connect operations for wavelength division multiplexing signals among all degrees. The section has a plurality of subsections. Each of the subsections corresponds to a respective one of the degrees and has an optical separator at an input side and an optical combiner at an output side. The multiplexer further includes a transponder aggregator section having a split-and-select switch-based transponder aggregator. The multiplexer also includes an optical line loopback having a connection path between the optical separator at the input side and the optical combiner at the output side of at least one of the subsections. | 10-03-2013 |
20140056371 | MIMO-OFDM-Based Flexible Rate Intra-Data Center Network - An optical network includes receiving inter-rack traffics from transmitter racks, converting by transmitters the inter-rack traffics to respective wavelength division multiplexing WDM optical signals, receiving and routing by a cyclic interleaver the optical signals from the transmitters to output ports in a cyclic manner, converting respective routed optical signals from the cyclic interleaver into respective electrical signals, and demodulating OFDM formats from respective converted optical signals containing signals for respective receiver racks. | 02-27-2014 |
20150043330 | END-TO-END HITLESS PROTECTION IN PACKET SWITCHED NETWORKS - A method and system are described for providing hitless protection in a packet switched network having source nodes and destination nodes. The method includes enabling a working path and a protecting path between the source and destination nodes. The working path is non-overlapping with respect to the protecting path. The method further includes replicating traffic in a given one of the source nodes to generate replicated traffic. The method also includes forwarding the traffic and the replicated traffic through a working path and a protecting path, respectively, from the given one of the source nodes to a particular one of the destination nodes. The method additionally includes delivering a hitless-protected service in the particular one of the destination nodes by selecting traffic packets received from either the working path or the protecting path. | 02-12-2015 |
20150043331 | ADDING LINK AGGREGATION GROUP TO HITLESS PROTECTION IN PACKET SWITCHED NETWORKS - A method is provided for traffic aggregation in a hitless protected packet switched network having source and destination nodes. The method includes enabling a working path and a protecting path between the source and destination nodes. The working path is non-overlapping with respect to the protecting path. The method includes generating, using a processor, internal marker packets at working and protecting input ports of the source nodes. Each market packet represents a respective marker time period. The method includes transmitting the marker packets to working and protecting output ports of the source nodes, by the working and protecting input ports of the source nodes. The method includes selectively aggregating, at each of the working and protecting output ports of the source nodes, hitless traffic sent from different working and protecting inputs ports of the source nodes to provide an aggregated flow there from, responsive to the marker packets. | 02-12-2015 |
20150085647 | Eliminating External Buffer for Hitless Protection by Using Channelized Flow Control - A packet switched communication system to support hitless protection includes a packet processor; a traffic manager with a buffer sized to compensate a maximum skew of each hitless path pair of a working path and a protecting path; and a hitless processor positioned between the packet processor and the traffic manager, wherein an interface between hitless processor and traffic manager has flow control to start or stop (XON/XOFF) traffic. | 03-26-2015 |