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.

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.

公开(公告)号：US20220069918A1

公开(公告)日：2022-03-03

申请号：US17525489

申请日：2021-11-12

Applicant: Juniper Networks, Inc.

Inventor： Yang YUE ,  Qiang WANG ,  Zhen QU ,  Xiao HAN

IPC: H04B10/54 ,  H04B10/079 ,  H04J14/02 ,  H04L1/00

Abstract: A method includes applying, to a modulated digital signal, a forward error correction (FEC) including a low-density parity-check (LDPC) to produce a coded digital signal. Nyquist shaping is applied to the coded digital signal to generate a filtered digital signal. A representation of the filtered digital signal is transmitted in an optical communication channel via a dense wavelength division multiplexing (DWDM) scheme.

公开(公告)号：US20200350994A1

公开(公告)日：2020-11-05

申请号：US16456761

申请日：2019-06-28

Applicant: Juniper Networks, Inc.

Inventor： Yang YUE ,  Qiang WANG ,  Zhen QU ,  Xiao HAN

IPC: H04B10/54 ,  H04L1/00 ,  H04B10/079 ,  H04J14/02

Abstract: A method includes modulating a digital signal via pulse amplitude modulation (PAM) and applying Nyquist shaping to the digital signal to generate a filtered digital signal. The method also includes converting the filtered digital signal into an analog signal and transmitting the analog signal in an optical communication channel via a dense wavelength division multiplexing (DWDM) scheme.

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.

公开(公告)号：US20210119708A1

公开(公告)日：2021-04-22

申请号：US17132449

申请日：2020-12-23

Applicant: Juniper Networks, Inc.

Inventor： Yang YUE ,  Qiang WANG ,  Zhen QU ,  Xiao HAN

IPC: H04B10/54 ,  H04B10/079 ,  H04J14/02 ,  H04L1/00

Abstract: A method includes modulating a digital signal via pulse amplitude modulation (PAM) and applying Nyquist shaping to the digital signal to generate a filtered digital signal. The method also includes converting the filtered digital signal into an analog signal and transmitting the analog signal in an optical communication channel via a dense wavelength division multiplexing (DWDM) scheme.

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.

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.