Discovery of an adjacent network element within a network data plane
Granted: October 27, 2015
Patent Number:
9172489
The present invention provides a system, apparatus and method for discovery of network elements, which are adjacent within the network data plane but may or may not be adjacent in the network control plane. In one embodiment of the present invention, digital network elements, with a plurality thereof having a lambda switching capability (hereinafter “LSC”) interface, is provided. A digital network element with an LSC interface originates and sends a local advertisement to its…
Upsampling optical transmitter
Granted: October 20, 2015
Patent Number:
9166696
An apparatus including a photodiode, a low pass filter, an analog-to-digital converter, an interpolation circuit and a digital signal processor is disclosed. The photodiode receives a portion of a plurality of optical signals, each of which is modulated in accordance with a corresponding one of a plurality of data streams, and each having a corresponding one of a plurality of wavelengths. The photodiode supplies an electrical output. The low-pass filter supplies a filtered output in…
Equalization mechanism for processing traffic based on three-quadrature amplitude modulation (3QAM)
Granted: October 20, 2015
Patent Number:
9166689
A system receives four-bit symbols that correspond to traffic associated with a three-bit phase modulation scheme and are encoded based on a four-bit phase modulation scheme. The system determines values with which to perform equalization that enable the four-bit symbols to be restored to a condition that existed prior to being transmitted to the system. The system performs, using the values, equalization on a four-bit symbol that includes at least a first pair of bits associated with a…
Hamming coded modulation
Granted: October 13, 2015
Patent Number:
9160454
An optical system may include a digital signal processor (DSP) to receive first samples of a digital signal. The first samples may be Hamming encoded. The DSP may correlate the first samples to multiple groups of second samples to determine multiple correlation values. Each of the multiple groups of second samples may correspond to respective code words. Each of the multiple correlation values may correspond to a correlation measurement between the first samples and each of the multiple…
Adaptive voltage scaling based on the results of forward error correction processing
Granted: October 13, 2015
Patent Number:
9158356
In one implementation, a device may include a voltage regulator circuit, a data processing circuit, and an error correction circuit, where the error correction circuit may correct errors in data processed by the data processing circuit to obtain error-corrected data and output an error-corrected version of the processed data. Additionally, an error monitor circuit may output an error signal indicative of a level of the errors in the processed data. A control circuit may receive the error…
Wide passband AWG
Granted: October 13, 2015
Patent Number:
9158068
Consistent with the present disclosure, an AWG is provided that has grating waveguide groupings that extend between a first free space region and a second free space region. The difference in length (?L) between successive grating waveguides differs for each grouping of grating waveguides, such that, for example, the ?L associated with a given grating waveguide grouping is not an integer multiple of any of the other grating waveguide groupings. The grating waveguide groupings direct…
Subsea optical communication system dual polarization idler
Granted: October 6, 2015
Patent Number:
9154258
Systems and methods are disclosed including a subsea link idler apparatus comprising at least one data laser generating a first laser beam as a data signal, having a first frequency within a first data channel bandwidth slot; a first continuous wave laser generating a second laser beam with a first polarization and a second frequency being within a second data channel bandwidth slot; a second continuous wave laser generating a third laser beam with a second polarization different from…
Clock phase detection in the frequency domain
Granted: October 6, 2015
Patent Number:
9154256
A digital signal processor (DSP) may receive samples of a signal from an analog-to-digital converter (ADC); convert the samples from a time domain to a frequency domain; determine a clock phase error of the samples while in the frequency domain; and provide a voltage corresponding to the clock phase error. The voltage may be provided to reduce timing errors associated with the samples.
Accurate identification of software tests based on changes to computer software code
Granted: September 22, 2015
Patent Number:
9141519
Consistent with the present disclosure, a block of software code or “software code block” that is executed while particular tests are carried out is assigned a software code block identifier, which is associated with test identifiers, which, in turn, identify the tests that were performed. The software code block identifiers and corresponding test identifiers are then stored in a database. When a portion of the software code block is later modified, either by a change to one or more…
OSPFTE extension to support GMPLS for flexible grid
Granted: September 15, 2015
Patent Number:
9137590
A method and system are disclosed in which a link state advertisement message (LSA) conforming to a Generalized Multiprotocol Label Switching (GMPLS) routing protocol is generated and transmitted. The LSA is associated with a TE Link between a transmit node and a receive node in a network. The transmit node supplies a plurality of optical signals, each of which has a plurality of frequencies, the frequencies being allocated among a plurality of spectral portions such that the plurality…
Controlling an optical transmitter that supports multiple modulation formats and baud rates
Granted: September 15, 2015
Patent Number:
9136972
An optical device receives a modulation format and a baud rate for transmission of an optical signal with multiple subcarrier signals, and generates the optical signal based on the modulation format and the baud rate. The optical device generates a dual-etalon response based on the optical signal, the modulation format, and the baud rate, where the dual-etalon response includes multiple peaks. The optical device compares the subcarrier signals of the optical signal and the peaks of the…
Reducing phase noise associated with optical sources
Granted: September 8, 2015
Patent Number:
9130681
An optical transmitter may include an optical source to provide a first optical signal having a varying frequency; an optical circuit to receive a portion of the first optical signal and provide a second optical signal corresponding to a change in frequency of the first optical signal; a photodetector to receive the first optical signal and provide an electrical signal that is indicative of the change in frequency of the first optical signal; an integrator to receive the electrical…
Optical hybrid mixer without waveguide crossings
Granted: September 8, 2015
Patent Number:
9128347
A multimoded interference coupler may include: first and second inputs to receive first and second optical signals such that light is not supplied through any portion of a first gap extending between the first and second inputs; first and second outputs to provide first and second components associated with the first and second optical signals, such that light is not output through any portion of a second gap extending between the first and second outputs. The first and second inputs may…
Multi-level recovery in transport networks
Granted: September 1, 2015
Patent Number:
9124522
Nodes and methods are disclosed for protection and restoration to protect against multiple failures for multiple paths involved for the same service in mesh networks, including, determining, by circuitry of a first node in a mesh network, a failure of a working path between the first node and a second node, wherein the second node, when triggered by the failure of the working path, switches to a protection path. Methods further include establishing through transmission of at least one…
Optical connection hitless bandwidth or spectrum resizing
Granted: September 1, 2015
Patent Number:
9124385
A method and system are disclosed in which a signaling message conforming to a GMPLS signaling protocol and associated with an optical connection is generated and transmitted by a transmit node to a receive node to change the size of a connection bandwidth in a network. The message may include information indicative of a number of spectral portions which correspond to frequencies of selected ones of the plurality of optical signals, selected ones of the plurality of optical signals being…
Apparatus to control carrier spacing in a multi-carrier optical transmitter
Granted: September 1, 2015
Patent Number:
9124371
Consistent with the present disclosure, data, in digital form, is received by a transmit node of an optical communication system, and is then provided to a modulator that, in turn, modulates light, received from an optical source at one of a plurality of periodically and preferably minimally spaced wavelengths. The plurality of periodically spaced wavelengths or carriers are grouped together with minimal carrier spacing, to form a superchannel. The carrier spacing between adjacent…
Multiplexer having ASE suppression
Granted: August 4, 2015
Patent Number:
9099833
Consistent with the present disclosure, optical filters are provided in a reconfigurable optical add-drop multiplexer (ROADM). In one example, groups of optical signals are amplified by corresponding erbium-doped fiber amplifiers (EDFAs) and supplied to each optical filter, which has a passband that includes the wavelengths associated with the received optical signal group. Light at wavelengths outside the passband of each optical filter, such as amplified stimulated emission (ASE) light…
Dual-drive modulator
Granted: July 28, 2015
Patent Number:
9094129
A transmitter module includes a processor configured to receive input data, and determine input values corresponding to the input data; a digital-to-analog converter configured to receive the input values from the processor, and generate first and second voltage signals based on the input values; a laser configured to output light; a Mach-Zehnder modulator configured to receive the light from the laser and the first and second voltage signals from the digital-to-analog converter, and…
Segmented distributed feedback laser
Granted: June 30, 2015
Patent Number:
9071038
The present invention provides for a semiconductor laser having a narrow linewidth and low power consumption for optical communication applications. According to various embodiments of the invention, a semiconductor laser is provided which includes a grating layer comprising a plurality of segmented gratings, each including a non-grating portion and a grating portion. The segmented gratings are configured to enhance a fundamental mode of the semiconductor laser while sufficiently…
Network interface and method of aggregating processor circuits
Granted: June 23, 2015
Patent Number:
9065747
A system having a first and second interfaces is described. At least one of the first and second interfaces has a cell engine, a first processor circuit, a second processor circuit, and a first and second transponder. The first processor circuit is coupled with the first transponder and the cell engine so as to transmit a header cell to the cell engine. The second processor circuit is coupled with the second transponder and the cell engine so as to transmit a body cell to the cell…
