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| Number | Title | Issue Date |
| 8180228 | Programmable phase detector for sequence equalizer for optical channels In a direct-detection receiver having an analog-to-digital converter (ADC) for sampling a received optical signal and a sequence estimator for recovering data symbols from a multi-bit sample stream generated by the ADC, a method of acquiring a channel lock condition... | 05/15/2012 |
| 8170418 | Protected light source for multiple wavelength division multiplexed passive optical networks (WDM-PONS) A protected light source for generating seed light for at least two wavelength division multiplexed passive optical networks (WDM-PONs). The protected light source includes an optical coupler having N≧2 input ports and M≧2 output ports, each output port being op... | 05/01/2012 |
| 8170074 | Tracking injection seeding power based on back facet monitoring (BFM) of an injection seeded laser A method of estimating an injection power of seed light injected into an injection-seeded transmitter. A back face monitoring (BFM) response of the injection-seeded transmitter is determined, and data representative of the BFM response stored in a memory. During run... | 05/01/2012 |
| 8166365 | Cycle slip location and correction Methods and techniques are disclosed for correcting the effect of cycle slips in a coherent communications system. A signal comprising SYNC bursts having a predetermined periodicity and a plurality of known symbols at predetermined locations between successive SYNC ... | 04/24/2012 |
| 8139954 | System and method for reducing memory requirements for electrical domain compensation of intra-channel nonlinearity in an optical communications system A digital filter is provided for processing an electrical input signal to be conveyed through an optical communications system. The processing generates a predistorted electrical signal using a compensation function that substantially mitigates for intra-channel non... | 03/20/2012 |
| 8135283 | Clock recovery with channel coefficients In a coherent optical receiver of an optical communications network, a method of recovering a clock signal from a high speed optical signal received through an optical link. A set of compensation vectors are adaptively computed for compensating Inter-symbol Interfer... | 03/13/2012 |
| 8125925 | Method and apparatus for non-disruptive call modification A method and system for changing the extent of data plane resources controlled by a control plane for a network connection which spans a contiguous set of nodes controlled by existing network control resources is disclosed. This is done in a non-disruptive manner. T... | 02/28/2012 |
| 8116232 | Method and apparatus for non-disruptive call modification A method and system for changing the extent of data plane resources controlled by a control plane for a network connection which spans a contiguous set of nodes controlled by existing network control resources is disclosed. This is done in a non-disruptive manner. T... | 02/14/2012 |
| 8059970 | Control system for a polar optical transmitter A method of controlling a polar optical transmitter comprising a dual-branch Mach-Zehnder (MZ) modulator driven by a pair of independent electrical drive signals. A cost function is provided which defines a relationship between a control parameter of the optical tra... | 11/15/2011 |
| 8059647 | Multicast implementation in a link state protocol controlled ethernet network Forwarding state may be installed for sparse multicast trees in a link state protocol controlled Ethernet network by enabling intermediate nodes to install state for one or more physical multicast trees, each of which may have multiple logical multicast trees mapped... | 11/15/2011 |
| 8046451 | Hierarchical tree-based protection scheme for mesh networks In a hierarchical tree-based protection scheme, a node in a mesh network is designated as a root node of a spanning hierarchical protection tree and subsequently invites each adjacent node to become its child within the tree. If the inviting node provides a more cap... | 10/25/2011 |
| 8023402 | Low conversion rate digital dispersion compensation A method of suppressing effects of aliasing in a system for digitally processing a high speed signal having a symbol rate of 1/T. The high speed signal is sampled at a fractional multiple (N) of the symbol rate, wherein 1 | 09/20/2011 |
| 8009985 | Traffic driven variable bandwidth optical transmission Link bandwidth is varied based on the subscriber traffic load. Varying the link bandwidth has the effect of varying the actual noise margin of the link (in an inverse relation), so that the noise margin will vary inversely with the traffic load. A beneficial result ... | 08/30/2011 |
| 8005368 | Signal equalizer in a coherent optical receiver A signal equalizer for compensating impairments of an optical signal received through a link of a high speed optical communications network. At least one set of compensation vectors are computed for compensating at least two distinct types of impairments. A frequenc... | 08/23/2011 |
| 7978736 | Efficient provisioning of a VT/TU cross-connect A method and apparatus for efficient provisioning of a VT/TU cross-connect includes checking a state of a control bit that specifies whether to assemble an output from multiple virtual tributary (VT1.5/VT2) or tributary unit (TU11/TU12) connections or handle the out... | 07/12/2011 |
| 7957641 | Method of WDM channel tagging and monitoring, and apparatus Provided is an optical apparatus and method wherein power transfer coefficients arising from SRS are measured at a designated co-location point and the power of dithers, which are impressed on the channels of a multiplexed optical signal propagating through the opti... | 06/07/2011 |
| 7940822 | Tracking injection seeding power based on back facet monitoring (BFM) of an injection seeded laser A method of estimating an injection power of seed light injected into an injection-seeded transmitter. A back face monitoring (BFM) response of the injection-seeded transmitter is determined, and data representative of the BFM response stored in a memory. During run... | 05/10/2011 |
| 7936999 | Automatic gain control in a coherent optical receiver In a coherent optical receiver, a method of at least partially compensating Polarization Dependent Loss (PDL) of an optical signal received through an optical communications system. A respective multi-bit sample stream of each one of a pair of orthogonal received po... | 05/03/2011 |
| 7930435 | Hub and spoke compression A method of compressing data traffic for transmission through a network, the method comprises computing, for each one of a plurality of contexts of data traffic within the network, a respective optimal dictionary for encoding data traffic; For each block of data to ... | 04/19/2011 |
| 7924836 | Break before make forwarding information base (FIB) population for multicast A method of installing forwarding state in a link state protocol controlled network node having a topology database representing a known topology of the network, and at least two ports for communication with corresponding peers of the network node. A unicast path is... | 04/12/2011 |
| 7913277 | Metadata extraction and re-insertion and improved transcoding in digital media systems A system, module and method is provided for metadata extraction and re-insertion. A module has a first input for receiving a compressed digital media stream having metadata such as DPI cues or content related information contained therein and an output for providing... | 03/22/2011 |
| 7899340 | Laser control in a coherent optical receiver Methods and systems for compensating a frequency mismatch Δf between a local Oscillator (LO) of a coherent optical receiver and a carrier of a received optical signal. An average frequency of the LO is controlled to compensate at least long-period variations of the... | 03/01/2011 |
| 7894728 | Sample timing control in an optical receiver A method of compensating phase error between parallel digital signals of a received optical signal, in a coherent optical receiver. A phase differential between the digital signals is determined. A digital skew is imposed between the digital signals, an amount of sk... | 02/22/2011 |
| 7894724 | Method and apparatus for improving dual-polarization optical communication performance A method and system for averaging the effects of polarization distortions across a multitude of transmitted data streams in a dual polarization multiplexed optical communications system. Data streams are interleaved amongst each other in accordance with a predetermi... | 02/22/2011 |
| 7894721 | Control of parameters in a global optical controller An optical network system having a global controller capable of controlling all the elements of the network. The controller receives performance data from each optical network element and calculates a performance value for each channel transmitting through the syste... | 02/22/2011 |
| 7869362 | Method and system for optical routing of variable-length packet data A method and system of routing variable-length packet data across a wave division multiplex (WDM) communications network having a plurality of data communications channels comprises inverse-multiplexing each data packet into a respective frame. Each frame includes a... | 01/11/2011 |
| 7853011 | Methods and apparatus for monitoring the integrity of a quantum channel supporting multi-quanta pulse transmission A transmitter classifies quantum pulses into supervisory pulses and message pulses, and assigns each message pulse to a message bit. Each message pulse is then encoded using a coding base randomly selected from a set of coding bases, and with a polarity relative to ... | 12/14/2010 |
| 7831733 | Policy-based forwarding in open shortest path first (OSPF) networks A method and system enables policy-based traffic forwarding in a data network by implementing policy-based control over propagation of LSA messages through the data network. A route tag is asserted in respect of a link state advertisement (LSA) message advertising a... | 11/09/2010 |
| 7822031 | Multicast implementation in a link state protocol controlled ethernet network Forwarding state may be installed for sparse multicast trees in a link state protocol controlled Ethernet network by enabling intermediate nodes to install state for one or more physical multicast trees, each of which may have multiple logical multicast trees mapped... | 10/26/2010 |
| 7787778 | Control system for a polar optical transmitter A method of controlling a polar optical transmitter comprising a dual-branch Mach-Zehnder (MZ) modulator driven by a pair of independent electrical drive signals. A cost function is provided which defines a relationship between a control parameter of the optical tra... | 08/31/2010 |
| 7787770 | Methods for co-modelling and analyzing packet networks operating over optical networks A method is provided for co-modelling and analyzing a packet network operating over an optical network. The method includes co-modelling the packet network and the optical network by generating a basic packet capacity based on a simulated packet network comprising p... | 08/31/2010 |
| 7774448 | Hierarchical tree-based protection scheme for mesh networks In a hierarchical tree-based protection scheme, a node in a mesh network is designated as a root node of a spanning hierarchical protection tree and subsequently invites each adjacent node to become its child within the tree. If the inviting node provides a more cap... | 08/10/2010 |
| 7769305 | High-speed digital signal processing in a coherent optical receiver In a coherent optical receiver, a frequency domain engine digitally processes at least two multi-bit sample streams of a received optical signal. The frequency domain engine includes a Fast Fourier Transform (FFT) filter for computing a complex vector representative... | 08/03/2010 |
| 7761543 | Method and apparatus for backward and forward compatibilty in device management A method and system permitting a network management system to be backward and forward compatible with a range of network elements or devices, and device versions. The present invention uses a combination of versioned interface negotiation, data driven interfaces or ... | 07/20/2010 |
| 7756421 | Electrical domain compensation of non-linear effects in an optical communications system Nonlinearity-induced signal distortions are compensated by processing an input communications signal, in the electrical domain prior to Electrical-to-optical conversion and transmission through an optical link of a communications system. According to the invention, ... | 07/13/2010 |
| 7701842 | Low conversion rate digital dispersion compensation A method of suppressing effects of aliasing in a system for digitally processing a high speed signal having a symbol rate of 1/T. The high speed signal is sampled at a fractional multiple (N) of the symbol rate, wherein 1 | 04/20/2010 |
| 7697528 | Multilink trunking for encapsulated traffic A node of a frame-based network has a group of outgoing links which are to be treated as an aggregated group of links. A frame distributor performs a distribution function on data frames which are intended for transmission on the group of links. The frame distributo... | 04/13/2010 |
| 7684712 | Non-linear equalizer in a coherent optical receiver A method of recovering a most likely value of each symbol transmitted through an optical communications network using a high speed optical signal. A stream of multi-bit digital samples of the optical signal is processed to generate a respective multi-bit estimate Xâ... | 03/23/2010 |
| 7676161 | Modulation E-field based control of a non-linear transmitter In a method of synthesizing an optical signal, a multi-bit digital representation of a desired optical E-field is generated. The multi-bit digital representation has a resolution of N1-bits, where N1 is an integer greater than 2. At least two analog drive signals ar... | 03/09/2010 |
| 7636525 | Signal acquisition in a coherent optical receiver A method and system for initializing a coherent optical receiver. Upon detection of an optical signal, a multi-bit digital sample stream of the optical signal is digitally processed to initialize each one of a plurality of adaptive control blocks of the coherent opt... | 12/22/2009 |
