Patents by Inventor John D McNicol

John D McNicol has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 11032020
    Abstract: Methods, systems, and apparatus, including computer programs encoded on computer storage media, for clock synchronizing an optical system and multiple leaf systems. In some implementations, an apparatus includes a receiver comprising: a local oscillator laser providing a local oscillator signal, a detector circuit operable to receive a first optical signal and detect first data carried by the first optical signal based on the local oscillator signal, a reference clock circuit supplying a clock signal, a digital signal processor (DSP) operable to receive the first data and supply a control signal to the reference clock circuit based on the first data, the reference clock circuit being operable to adjust the clock signal based on the control signal; and a transmitter operable to output a second optical signal carrying second data, the second data having an associated rate that is based on the clock signal.
    Type: Grant
    Filed: September 20, 2019
    Date of Patent: June 8, 2021
    Assignee: Infiriera Corporation
    Inventors: Han H. Sun, Kuang-Tsan Wu, John D. McNicol
  • Publication number: 20210111802
    Abstract: Consistent with the present disclosure a network is provided that includes a primary node and a plurality of secondary nodes. The primary node, as well as each of the secondary nodes, includes a laser that is “shared” between the transmit and receive sections. That is, light output from the laser is used for transmission as well as for coherent detection. In the coherent receiver, the frequency of the primary node laser is detected and, based on such detected frequency, the frequency of the secondary node laser is adjusted to detect the received information or data. Such frequency detection also serves to adjust the transmitted signal frequency, because the laser is shared between the transmit and receive portions in each secondary receiver. Light output from the primary node laser, which is also shared between transmit and receive portions in the primary node, is thus also set to a frequency that permits detection of each of the incoming optical signals by way of coherent detection.
    Type: Application
    Filed: May 11, 2020
    Publication date: April 15, 2021
    Inventors: John D. McNicol, Han Henry Sun, Kuang-Tsan Wu
  • Publication number: 20210111803
    Abstract: Consistent with the present disclosure a network is provided that includes a primary node and a plurality of secondary nodes. The primary node, as well as each of the secondary nodes, includes a laser that is “shared” between the transmit and receive sections. That is, light output from the laser is used for transmission as well as for coherent detection. In the coherent receiver, the frequency of the primary node laser is detected and, based on such detected frequency, the frequency of the secondary node laser is adjusted to detect the received information or data. Such frequency detection also serves to adjust the transmitted signal frequency, because the laser is shared between the transmit and receive portions in each secondary receiver. Light output from the primary node laser, which is also shared between transmit and receive portions in the primary node, is thus also set to a frequency that permits detection of each of the incoming optical signals by way of coherent detection.
    Type: Application
    Filed: May 11, 2020
    Publication date: April 15, 2021
    Inventors: John D. McNicol, Han Henry Sun, Kuang-Tsan Wu
  • Patent number: 10965439
    Abstract: Methods, systems, transceivers, and apparatus are included for clock synchronizing an optical system and multiple leaf systems. In some implementations, a transceiver includes a receiver and a transmitter. The receiver includes an optical hybrid circuit operable to receive a first modulated optical signal and local oscillator light and to supply optical mixing products based on the first modulated optical signal and the local oscillator light. A photodiode circuit operable to supply an electrical signal based on the optical mixing products. An analog-to-digital conversion circuitry operable to supply digital signals based on the electrical signal. A digital signal processor operable to generate a supply signal based on the digital signals and provide the supply signal to a reference clock circuit for generating a clock signal. The transmitter is operable to output a second modulated optical signal that includes a timing of data based on the clock signal.
    Type: Grant
    Filed: September 20, 2019
    Date of Patent: March 30, 2021
    Assignee: Infinera Corporation
    Inventors: Han H. Sun, John D. McNicol, Kuang-Tsan Wu
  • Publication number: 20200389234
    Abstract: Methods, systems, and apparatus, including computer programs encoded on computer storage media, for clock synchronizing an optical system and multiple leaf systems. In some implementations, a method includes: first data is received from an optical system. The first data is detected using a local oscillator signal provided by a local oscillator laser. The first data is processed using a first sampling rate. A frequency of a clock signal supplied by a reference clock is adjusted based on the processed first data. Second data is transmitted to the optical system at a rate based on the clock signal.
    Type: Application
    Filed: September 20, 2019
    Publication date: December 10, 2020
    Inventors: Han H. Sun, Kuang-Tsan Wu, John D. McNicol
  • Publication number: 20200351006
    Abstract: Methods, systems, and apparatus, including computer programs encoded on computer storage media, for clock synchronizing an optical system and multiple leaf systems. In some implementations, an apparatus includes a receiver comprising: a local oscillator laser providing a local oscillator signal, a detector circuit operable to receive a first optical signal and detect first data carried by the first optical signal based on the local oscillator signal, a reference clock circuit supplying a clock signal, a digital signal processor (DSP) operable to receive the first data and supply a control signal to the reference clock circuit based on the first data, the reference clock circuit being operable to adjust the clock signal based on the control signal; and a transmitter operable to output a second optical signal carrying second data, the second data having an associated rate that is based on the clock signal.
    Type: Application
    Filed: September 20, 2019
    Publication date: November 5, 2020
    Inventors: Han H. Sun, Kuang-Tsan Wu, John D. McNicol
  • Publication number: 20200336285
    Abstract: Methods, systems, transceivers, and apparatus are included for clock synchronizing an optical system and multiple leaf systems. In some implementations, a transceiver includes a receiver and a transmitter. The receiver includes an optical hybrid circuit operable to receive a first modulated optical signal and local oscillator light and to supply optical mixing products based on the first modulated optical signal and the local oscillator light. A photodiode circuit operable to supply an electrical signal based on the optical mixing products. An analog-to-digital conversion circuitry operable to supply digital signals based on the electrical signal. A digital signal processor operable to generate a supply signal based on the digital signals and provide the supply signal to a reference clock circuit for generating a clock signal. The transmitter is operable to output a second modulated optical signal that includes a timing of data based on the clock signal.
    Type: Application
    Filed: September 20, 2019
    Publication date: October 22, 2020
    Inventors: Han H. Sun, John D. McNicol, Kuang-Tsan Wu
  • Patent number: 10404378
    Abstract: A transmitter is provided that transmits data in either a “quasi-DP-BPSK” (“QDP”) mode or in a DP-QPSK mode. In the QDP mode, data bits are transmitted as changes in phase between first and second phase states along a first axis or as changes in phase between third and fourth phase states along a second axis in the IQ plane. A sequence bit identifies which axis carries the data bit. The sequence bit is one of a series of sequence bits that may be generated by a pseudo-random number generator. The series of sequence bits can be relatively long to permit sufficiently random changes in the axis that carries the data. Thus, unlike conventional BPSK, in which data is transmitted between phase states along a single axis, the present disclosure provides an apparatus and related method for randomly selecting one of two axes, for example, for each transmitted bit.
    Type: Grant
    Filed: March 23, 2017
    Date of Patent: September 3, 2019
    Assignee: Infinera Corporation
    Inventors: John D. McNicol, Kuang-Tsan Wu
  • Patent number: 10014975
    Abstract: An optical system includes a transmitter module and/or a receiver module. The transmitter module is configured to receive input data, map the input data to a set of subcarriers associated with an optical communication channel, independently apply spectral shaping to each of the subcarriers, generate input values based on the spectral shaping of each of the subcarriers, generate voltage signals based on the input values, modulate light based on the voltage signals to generate an output optical signal that includes the subcarriers, and output the output optical signal. The receiver module is configured to receive the output optical signal, convert the output optical signal to a set of voltage signals, generate digital samples based on the set of voltage signals, independently process the digital samples for each of the subcarriers, map the processed digital samples to produce output data, and output the output data.
    Type: Grant
    Filed: September 28, 2012
    Date of Patent: July 3, 2018
    Assignee: Infinera Corporation
    Inventors: David James Krause, Han Sun, Yuejian Wu, John D. McNicol, Kuang-Tsan Wu
  • Patent number: 9900124
    Abstract: Consistent with the present disclosure, data, in digital form, is received by a transmit node of an optical communication system, is processed and then output to drive a modulator. The modulator, in turn, modulates light at one of a plurality of wavelengths in accordance with the received data, forming a plurality of corresponding carriers. The plurality of wavelengths used for the plurality of carriers are spectrally spaced apart by a common, periodic fixed spacing. The plurality of carriers are optically combined with a fixed spacing combiner to form a superchannel. A plurality of superchannels are generated and then multiplexed together onto an optical communication path and transmitted to a receive node. Each superchannel includes a plurality of carriers, each spectrally separated by the same fixed spacing. The plurality of superchannels are spectrally separated by an amount corresponding to the fixed spacing of the plurality of carriers.
    Type: Grant
    Filed: April 1, 2011
    Date of Patent: February 20, 2018
    Assignee: Infinera Corporation
    Inventors: John D. McNicol, Michael Francis Van Leeuwen
  • Patent number: 9900104
    Abstract: Consistent with the present disclosure, data, in digital form, is received by a transmit node of an optical communication system, and converted to an analog signal by a digital-to-analog converter (DAC) to drive a modulator. The modulator, in turn, modulates light at one of a plurality of wavelengths in accordance with the received data forming a plurality of corresponding carriers. The carriers are modulated according to one of a plurality of modulation formats and then optically combined to form a superchannel of a constant maximum capacity, for example. Accordingly, the number of carriers and the bit rate for each carrier remain constant for each modulation format to realize a constant maximum capacity. The superchannel is then transmitted over an optical communication path to a receive node. At the receive node, the superchannel is optically demultiplexed from a plurality of other superchannels.
    Type: Grant
    Filed: April 1, 2011
    Date of Patent: February 20, 2018
    Assignee: Infinera Corporation
    Inventors: John D. McNicol, Kuang-Tsan Wu, Han Henry Sun
  • Publication number: 20170195056
    Abstract: A transmitter is provided that transmits data in either a “quasi-DP-BPSK” (“QDP”) mode or in a DP-QPSK mode. In the QDP mode, data bits are transmitted as changes in phase between first and second phase states along a first axis or as changes in phase between third and fourth phase states along a second axis in the IQ plane. A sequence bit identifies which axis carries the data bit. The sequence bit is one of a series of sequence bits that may be generated by a pseudo-random number generator. The series of sequence bits can be relatively long to permit sufficiently random changes in the axis that carries the data. Thus, unlike conventional BPSK, in which data is transmitted between phase states along a single axis, the present disclosure provides an apparatus and related method for randomly selecting one of two axes, for example, for each transmitted bit.
    Type: Application
    Filed: March 23, 2017
    Publication date: July 6, 2017
    Inventors: John D. McNicol, Kuang-Tsan Wu
  • Patent number: 9621274
    Abstract: Consistent with the present disclosure a transmitter is provided that transmits data in either a “quasi-DP-BPSK” (“QDP”) mode or in a DP-QPSK mode. In the QDP mode, data bits are transmitted as changes in phase between first and second phase states along a first axis or as changes in phase between third and fourth phase states along a second axis in the IQ plane. Although the transmitter outputs an optical signal that changes in phase between each of the four states, a sequence bit identifies which axis carries the data bit. The sequence bit is one of a series of sequence bits that may be generated by a pseudo-random number generator. The series of sequence bits can be relatively long, e.g., 32 bits, to permit sufficiently random changes in the axis that carries the data.
    Type: Grant
    Filed: April 7, 2011
    Date of Patent: April 11, 2017
    Assignee: Infinera Corporation
    Inventors: John D. McNicol, Kuang-Tsan Wu
  • Patent number: 9485049
    Abstract: An optical system may include optical transmitters to provide respective optical signals. Each of the respective optical signals may provide one or more carriers in an optical channel. The optical channel may include multiple carriers associated with the respective optical signals. First and second carriers, of the multiple carriers, may have a particular carrier space width. The particular carrier space width may include a frequency error associated with one or more optical signals of the respective optical signals. The optical system may include a control system to determine the frequency error and cause one or more of the optical transmitters to adjust the particular carrier space width based on the adjusted frequency error.
    Type: Grant
    Filed: March 29, 2013
    Date of Patent: November 1, 2016
    Assignee: Infinera Corporation
    Inventors: John D. McNicol, Han H. Sun, David J. Krause
  • Patent number: 9319180
    Abstract: An optical receiver may receive a data stream, and may decode the data stream using a first iterative forward error correction (FEC) decoder. The optical receiver may determine whether to further decode the data stream using the first iterative FEC decoder or a second iterative FEC decoder that is different from the first iterative FEC decoder. The optical receiver may selectively perform a first action or a section action based on determining whether to further decode the data stream. The first action may include providing the data stream to the first iterative FEC decoder or the second iterative FEC decoder for further decoding when the data stream is to be further decoded. The second action may include preventing the data stream from being provided to the first iterative FEC decoder or the second iterative FEC decoder when the data stream is not to be further decoded.
    Type: Grant
    Filed: June 30, 2014
    Date of Patent: April 19, 2016
    Assignee: Infinera Corporation
    Inventors: Sandy Thomson, Han Sun, John D. McNicol
  • Patent number: 9312962
    Abstract: An optical modulator includes a splitter, phase modulators, amplitude modulators, intensity modulators, and a combiner. The splitter is configured to receive light, and split the light into portions of the light. Each of the phase modulators is configured to receive a corresponding one of the portions of the light, and modulate a phase of the portion of the light to provide a phase-modulated signal. Each of the amplitude modulators is configured to receive a corresponding one of the phase-modulated signals, and modulate an amplitude of the phase-modulated signal to provide an amplitude-modulated signal. Each of the intensity modulators is configured to receive a corresponding one of the amplitude-modulated signals, and modulate an intensity of the amplitude-modulated signals to provide an intensity-modulated signal. The combiner is configured to receive the intensity-modulated signals, combine the intensity-modulated signals into a combined signal, and output the combined signal.
    Type: Grant
    Filed: November 13, 2012
    Date of Patent: April 12, 2016
    Assignee: Infinera Corporation
    Inventors: David J. Krause, Damien Lambert, Masaki Kato, Vikrant Lal, Radhakrishnan L. Nagarajan, Mehrdad Ziari, Fred A. Kish, Jr., John D. McNicol, Han Henry Sun, Kuang-Tsan Wu
  • Patent number: 9236952
    Abstract: An optical receiver receives an optical signal with a phase error and pilot symbols, and converts the optical signal into an electrical signal. The optical receiver identifies, based on the pilot symbols, a cycle slip due to the phase error and associated with a transition time. The optical receiver determines, based on the pilot symbols, a direction and a center of the cycle slip, and generates a rotation value based on the direction and the center. The optical receiver applies the rotation value to minimize the phase error in the electrical signal except for phase error associated with the transition time and to generate a modified electrical signal. The optical receiver generates an erase signal based on the transition time and the center of the cycle slip, and uses the erase signal to minimize an effect of the phase error associated with the transition time of the cycle slip.
    Type: Grant
    Filed: December 26, 2013
    Date of Patent: January 12, 2016
    Assignee: Infinera Corporation
    Inventors: Han H. Sun, John D. McNicol, Kuang-Tsan Wu
  • Publication number: 20150381315
    Abstract: An optical receiver may receive a data stream, and may decode the data stream using a first iterative forward error correction (FEC) decoder. The optical receiver may determine whether to further decode the data stream using the first iterative FEC decoder or a second iterative FEC decoder that is different from the first iterative FEC decoder. The optical receiver may selectively perform a first action or a section action based on determining whether to further decode the data stream. The first action may include providing the data stream to the first iterative FEC decoder or the second iterative FEC decoder for further decoding when the data stream is to be further decoded. The second action may include preventing the data stream from being provided to the first iterative FEC decoder or the second iterative FEC decoder when the data stream is not to be further decoded.
    Type: Application
    Filed: June 30, 2014
    Publication date: December 31, 2015
    Inventors: Sandy THOMSON, Han Sun, John D. McNicol
  • Patent number: 9178624
    Abstract: A digital signal processor (DSP) may receive a signal that has an x-polarization (x-pol) and a y-polarization (y-pol). The DSP may equalize the x-pol of the signal and the y-pol of the signal based on filter coefficients determined using a constant modulus algorithm (CMA). The DSP may perform phase correction on the equalized x-pol signal and the equalized y-pol signal. The DSP may identify a first frame header pattern within the phase-corrected x-pol signal, and may identify a second frame header pattern within the phase-corrected y-pol signal. The DSP may determine, based on the first frame header pattern and the second frame header pattern, a quantity of lock-in differential group delay (DGD). The device may adjust one or more of the filter coefficients to remove the quantity of lock-in DGD and to permit an amount of polarization mode dispersion to be determined based on the filter coefficients.
    Type: Grant
    Filed: March 31, 2014
    Date of Patent: November 3, 2015
    Assignee: Infinera Corporation
    Inventors: Han H. Sun, Kuang-Tsan Wu, Ahmed Awadalla, John D. Mcnicol
  • Patent number: 9166696
    Abstract: 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 response to the electrical output. The analog-to-digital converter is configured to sample the filtered output at a first sampling rate to generate a plurality of first data samples. The interpolation circuit is configured to receive the plurality of first data samples and supply a plurality of second data samples at a second sampling rate less the first sampling rate. The digital signal processor circuit is configured to receive the plurality of second data samples.
    Type: Grant
    Filed: August 28, 2014
    Date of Patent: October 20, 2015
    Assignee: Infinera Corporation
    Inventors: Kuang-Tsan Wu, John D. McNicol, David F. Welch, Stephen G. Grubb, Pierre Mertz