公开(公告)号：US11949498B2

公开(公告)日：2024-04-02

申请号：US17516879

申请日：2021-11-02

Applicant: Cisco Technology, Inc.

Inventor： Thomas Duthel ,  Helmut Preisach

IPC: H04B10/50 ,  G02F1/21 ,  H04B10/508 ,  H04J14/08

CPC classification number: H04J14/08 ,  G02F1/212 ,  H04B10/5053 ,  H04B10/508

Abstract: An optical modulator comprises, as optical modulator components, first and second transmitter chains and a first optical time division multiplex, OTDM, generator arranged to receive time interleaved optical pulses generated by one of said optical modulator components.

公开(公告)号：US20210152254A1

公开(公告)日：2021-05-20

申请号：US17077227

申请日：2020-10-22

Applicant: Cisco Technology, Inc.

Inventor： Thomas Duthel ,  Soeren Gehrke

IPC: H04B10/58

Abstract: An approach for pre-distorting an input signal for an optical transmitter so as to at least partially compensate in advance for linear and non-linear distortions of the optical transmitter is provided.

公开(公告)号：US09991953B1

公开(公告)日：2018-06-05

申请号：US15398897

申请日：2017-01-05

Applicant: Cisco Technology, Inc.

Inventor： Christopher Fludger ,  Thomas Duthel

IPC: H04B10/073 ,  H04B10/50

CPC classification number: H04B10/0731 ,  H04B10/5057

Abstract: A self-calibration procedure for an optical transmitter is provided. During the self-calibration procedure, a phase bias of an optical modulator of the optical transmitter is set so that an in-phase path and a quadrature path of the optical modulator are in phase. Stimulus signals are supplied to the in-phase and quadrature paths of the optical modulator, over a frequency range. Detection, with a photodetector, is made of an optical output of the optical modulator at a plurality of frequency steps over the frequency range. A photodetector converts an optical output of the optical modulator to an electrical signal. First and second measurement values are generated from the electrical signal output from the photodetector. A frequency spectrum and/or time delay is computed from the first and second measurement values for each frequency step value over the frequency range.

公开(公告)号：US09935715B2

公开(公告)日：2018-04-03

申请号：US15465972

申请日：2017-03-22

Applicant: Cisco Technology, Inc.

Inventor： Thomas Duthel

IPC: H04B10/00 ,  H04B10/40 ,  H04B10/278

CPC classification number: H04B10/40 ,  H04B10/278

Abstract: Embodiments of the present disclosure provide techniques and an apparatus for partitioning calibration data into line card and pluggable properties and processing the partitioned data using a processor of the line card. For example, calibration information corresponding to components in the pluggable module may be stored on the pluggable module and transferred from the pluggable optical module to the processor on the line card. The processor may combine the calibration information received from the optical module with calibration information corresponding to properties on the line card to obtain system calibration information. The system calibration information may be used to configure one or more components used to process electric signals sent to or received from the optical module.

公开(公告)号：US09735888B2

公开(公告)日：2017-08-15

申请号：US14921222

申请日：2015-10-23

Applicant: Cisco Technology, Inc.

Inventor： Christopher Fludger ,  Thomas Duthel ,  Joerg Leykauf ,  Karsten Michaelsen

IPC: H04B10/00 ,  H04B10/61 ,  H04L7/00 ,  H04B10/532 ,  H04B10/556 ,  H04B10/516

CPC classification number: H04B10/6164 ,  H04B10/5161 ,  H04B10/532 ,  H04B10/5561 ,  H04L7/0075 ,  H04L27/00

Abstract: In an optical receiver, an optical local oscillator (LO) frequency is generated. A modulated optical frequency is received at the optical receiver. An LO-signal frequency offset between the received modulated optical frequency and the optical LO frequency is determined. A determination is made as to whether the LO-signal frequency offset is in one of multiple predefined non-overlapping target windows that cover respective non-zero LO-signal frequency offsets. If it is determined that the LO-signal frequency offset is not in one of the target windows, the optical LO frequency is tuned to drive the LO-signal frequency offset toward one of the target windows to ensure the LO-signal frequency offset is non-zero.

公开(公告)号：US09337937B2

公开(公告)日：2016-05-10

申请号：US14202293

申请日：2014-03-10

Applicant: Cisco Technology, Inc.

Inventor： Thomas Duthel ,  Juergen Hauenschild ,  Theodor Kupfer

IPC: H04B10/61 ,  H04B10/06 ,  H04B10/079

CPC classification number: H04B10/616 ,  H04B10/07955

Abstract: An optical signal is received at a coherent optical receiver. The received optical signal is converted to a first electrical signal and a second electrical signal through a first photodetector and a second photodetector, respectively. The first electrical signal is input into a first single input variable gain amplifier, and the second electrical signal is input into a second single input variable gain amplifier. A gain of at least one of the first single input variable gain amplifier or the second single input variable gain amplifier is controlled to balance the output of the first single input variable gain amplifier and the output of the second single input variable gain amplifier. The output of the first single input variable gain amplifier and the output of the second single input variable gain amplifier are input into a differential amplifier. A receiver output is obtained at an output of the differential amplifier.

Abstract translation: 在相干光接收机处接收光信号。 所接收的光信号分别通过第一光电检测器和第二光电检测器转换成第一电信号和第二电信号。 第一电信号被输入到第一单输入可变增益放大器中，并且第二电信号被输入到第二单输入可变增益放大器。 控制第一单输入可变增益放大器或第二单输入可变增益放大器中的至少一个的增益，以平衡第一单输入可变增益放大器的输出和第二单输入可变增益放大器的输出。 第一单输入可变增益放大器的输出和第二单输入可变增益放大器的输出被输入到差分放大器中。 在差分放大器的输出处获得接收器输出。