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    METHODS AND APPARATUS FOR IMPROVING THE SKEW TOLERANCE OF A COHERENT OPTICAL TRANSPONDER IN AN OPTICAL COMMUNICATION SYSTEM
    1.
    发明申请
    METHODS AND APPARATUS FOR IMPROVING THE SKEW TOLERANCE OF A COHERENT OPTICAL TRANSPONDER IN AN OPTICAL COMMUNICATION SYSTEM 审中-公开

    公开(公告)号：US20190342028A1

    公开(公告)日：2019-11-07

    申请号：US15970485

    申请日：2018-05-03

    Applicant: Juniper Networks, Inc.

    Inventor： Xuan HE ,  Qiang WANG ,  Yang YUE

    IPC: H04J14/06 ,  H04B10/61 ,  G02B6/12 ,  H04B10/2507

    Abstract: In some embodiments, an apparatus includes a memory and a processor operatively coupled to the memory. The processor is configured to be operatively coupled to a first optical transponder and a second optical transponder. The processor is configured to receive, from the second optical transponder, a signal representing a skew value of an optical signal and a signal representing a bit-error-rate (BER) value of the optical signal. The skew value is associated with a skew between an in-phase component of the optical signal and a quadrature component of the optical signal. The processor is configured to determine, based on at least one of the skew value or the BER value, if a performance degradation of the first optical transponder satisfies a threshold. The processor is configured to send a control signal to the first optical transponder to adjust a pulse shaping or a data baud rate of the first optical transponder.

    METHODS AND APPARATUS FOR DETECTING AND COMPENSATING BANDWIDTH LIMITATION AND MODULATION NONLINEARITY OF A COHERENT OPTICAL TRANSPONDER
    4.
    发明申请
    METHODS AND APPARATUS FOR DETECTING AND COMPENSATING BANDWIDTH LIMITATION AND MODULATION NONLINEARITY OF A COHERENT OPTICAL TRANSPONDER 审中-公开

    公开(公告)号：US20190386750A1

    公开(公告)日：2019-12-19

    申请号：US16008713

    申请日：2018-06-14

    Applicant: Juniper Networks, Inc.

    Inventor： Qiang WANG ,  Yang YUE

    IPC: H04B10/61 ,  H04B10/079 ,  H04B10/073

    Abstract: In some embodiments, an apparatus includes a memory and a processor operatively coupled to the memory. The processor is configured to send a stimulus signal at a frequency that corresponds to a first frequency value to a tributary channel of a coherent optical transponder. The processor is configured to adjust an amplitude of the stimulus signal and receive a first plurality of output optical power values. The processor is configured to adjust the frequency of the stimulus signal and receive a second plurality of output optical power values. The processor is configured to determine a bandwidth limitation and a modulation nonlinearity, and then send a first signal to a first filter to reduce the bandwidth limitation and a second signal to a second filter to reduce the modulation nonlinearity.

    DETECTION AND ALIGNMENT OF XY SKEW
    5.
    发明申请
    DETECTION AND ALIGNMENT OF XY SKEW 有权
    XY轴的检测和对准

    公开(公告)号：US20150341121A1

    公开(公告)日：2015-11-26

    申请号：US14816977

    申请日：2015-08-03

    Applicant: Juniper Networks, Inc.

    Inventor： Yang YUE ,  Bo Zhang ,  Robert C. Lofland ,  Jason T. O'Neil ,  Qiang Wang ,  Jon J. Anderson

    IPC: H04B10/532

    CPC classification number: H04B10/532 ,  H04B10/5053 ,  H04B10/5057

    Abstract: An optical device may include a modulator. The modulator may receive an optical signal. The modulator may modulate the optical signal to include a first channel and a second channel. The modulator may modulate the optical signal based on a training pattern associated with detecting a skew. The modulator may cause the first channel to interfere with the second channel. The modulator may perform a power measurement on the first channel and the second channel. The modulator may determine the skew based on the power measurement and the training pattern. The modulator may time delay the first channel or the second channel to align the skew based on the skew.

    Abstract translation: 光学装置可以包括调制器。 调制器可以接收光信号。 调制器可以调制光信号以包括第一通道和第二通道。 调制器可以基于与检测偏斜相关联的训练模式来调制光信号。 调制器可能导致第一通道干扰第二通道。 调制器可以在第一通道和第二通道上执行功率测量。 调制器可以基于功率测量和训练模式来确定偏斜。 调制器可以基于偏斜来延迟第一通道或第二通道以对准偏斜。

    METHODS AND APPARATUS FOR LOW-LOSS RECONFIGURABLE OPTICAL QUADRATURE AMPLITUDE MODULATION (QAM) SIGNAL GENERATION
    6.
    发明申请
    METHODS AND APPARATUS FOR LOW-LOSS RECONFIGURABLE OPTICAL QUADRATURE AMPLITUDE MODULATION (QAM) SIGNAL GENERATION 审中-公开

    公开(公告)号：US20190312647A1

    公开(公告)日：2019-10-10

    申请号：US16440693

    申请日：2019-06-13

    Applicant: Juniper Networks, Inc.

    Inventor： Yang YUE ,  Bo ZHANG ,  Qiang WANG

    IPC: H04B10/54 ,  H04B10/564 ,  H04B10/50

    Abstract: In some embodiments, an apparatus includes a quadrature amplitude modulation (QAM) optical modulator which includes a first phase modulator (PM), a second PM, a tunable optical coupler (TOC), and an optical combiner (OC). The TOC is configured to split a light wave at an adjustable power splitting ratio to produce a first split light wave and a second split light wave. The first PM is configured to modulate the first split light wave in response to a first multi-level electrical signal to produce a first modulated light wave. The second PM is configured to modulate the second split light wave in response to a second multi-level electrical signal to produce a second modulated light wave. The OC is then configured to combine the first modulated light wave and the second modulated light wave to generate a QAM optical signal.

    METHODS AND APPARATUS FOR DETECTING AND COMPENSATING POWER IMBALANCE AND MODULATION IMPERFECTION FOR A COHERENT OPTICAL TRANSMITTER
    7.
    发明申请
    METHODS AND APPARATUS FOR DETECTING AND COMPENSATING POWER IMBALANCE AND MODULATION IMPERFECTION FOR A COHERENT OPTICAL TRANSMITTER 审中-公开

    公开(公告)号：US20180248620A1

    公开(公告)日：2018-08-30

    申请号：US15965326

    申请日：2018-04-27

    Applicant: Juniper Networks, Inc.

    Inventor： Qiang WANG ,  Yang YUE ,  Xuan HE

    IPC: H04B10/079 ,  H04B10/532 ,  H04B10/564 ,  H04B10/516

    CPC classification number: H04B10/07955 ,  H04B10/5161 ,  H04B10/532 ,  H04B10/541 ,  H04B10/564

    Abstract: In some embodiments, a non-transitory processor-readable medium storing code representing instructions to be executed by a processor comprises code to cause the processor to determine, during a calibration of a coherent optical transmitter, a set of parameters associated with each tributary channel by sending a first signal to a digital signal processor (DSP) to adjust a scale factor of that tributary channel. The scale factor is associated with a tap characteristic of a finite impulse response (FIR) filter of the DSP. The code further causes the processor to determine a power imbalance between two tributary channels based on the set of parameters associated with each tributary channel. The code further causes the processor to send a second signal to the coherent optical transmitter to adjust a set of operational settings of the coherent optical transmitter based on the power imbalance and the set of parameters associated with each tributary channel.

    DETECTION AND COMPENSATION OF POWER IMBALANCES FOR A TRANSMITTER
    9.
    发明申请
    DETECTION AND COMPENSATION OF POWER IMBALANCES FOR A TRANSMITTER 有权

    公开(公告)号：US20180076901A1

    公开(公告)日：2018-03-15

    申请号：US15264239

    申请日：2016-09-13

    Applicant: Juniper Networks, Inc.

    Inventor： Yang YUE ,  Qiang WANG ,  Bo ZHANG

    IPC: H04B10/564 ,  H04J14/06 ,  H04B10/516

    CPC classification number: H04B10/564 ,  H04B10/502 ,  H04B10/503 ,  H04B10/5053 ,  H04B10/50572 ,  H04B10/516 ,  H04B10/532 ,  H04J14/06

    Abstract: An optical device may include a transmitter to provide an optical signal via a set of channels and a modulator. The optical device may include two or more tributary modulators to modulate the set of channels with a training pattern. The optical device may include a set of optics to alter a first channel relative to a second channel of the set of channels. The optical device may include a detector to determine an optical power measurement of the optical signal after the first channel is altered relative to the second channel. The optical device may include a controller to generate a control signal to adjust a power balance associated with the optical signal based on the optical power measurement. The optical device may include a controller to provide the control signal to a tributary modulator to alter a modulation of the optical signal.

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