公开(公告)号：US11342999B2

公开(公告)日：2022-05-24

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：US09935720B2

公开(公告)日：2018-04-03

申请号：US15644084

申请日：2017-07-07

Applicant: Cisco Technology, Inc.

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

IPC: H04B10/61 ,  H04B10/532 ,  H04L27/00 ,  H04B10/516 ,  H04B10/556

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

Abstract: A system includes a laser configured to generate a tunable optical frequency. The system also includes an optical transmitter to map baseband data to symbols represented in a digital modulation constellation, add a frequency offset to the digital modulation constellation to cause the digital modulation constellation to rotate at a rate equal to the added frequency offset, modulate the optical frequency with the rotating digital modulation constellation, and transmit the resulting modulated optical frequency. The system also includes an optical receiver to receive the transmitted modulated optical frequency and, using the tunable optical frequency, detect the rotating digital modulation constellation conveyed by the received modulated optical frequency.

公开(公告)号：US09712247B2

公开(公告)日：2017-07-18

申请号：US14084746

申请日：2013-11-20

Applicant: Cisco Technology, Inc.

Inventor： Thomas Duthel

IPC: H04B10/516 ,  H04B10/50

CPC classification number: H04B10/516 ,  H04B10/5053

Abstract: In one embodiment, a method includes receiving an optical input signal to be modulated by an IQ modulator. The method includes applying data to first and second modulators during a first operation, and applying a first pattern of data to the first modulator and a second pattern of data to the second modulator during a second operation. The second operation results in an optical output signal of the IQ modulator having a low power output and a high power output. The first and second patterns are defined to provide respective desired average powers for a predefined time period based on the low and high power outputs. In another embodiment, a method includes indentifying a transmitter in an optical system by low bit rate signaling. Low bit rate signaling includes receiving an optical input signal from an optical source and transmitting identification data of the transmitter.

公开(公告)号：US20220158752A1

公开(公告)日：2022-05-19

申请号：US17516879

申请日：2021-11-02

Applicant: Cisco Technology, Inc.

Inventor： Thomas Duthel ,  Helmut Preisach

IPC: H04J14/08 ,  H04B10/50 ,  G02F1/21 ,  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：US20170310401A1

公开(公告)日：2017-10-26

申请号：US15644084

申请日：2017-07-07

Applicant: Cisco Technology, Inc.

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

IPC: H04B10/61 ,  H04B10/556 ,  H04B10/532 ,  H04L27/00 ,  H04B10/516

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

Abstract: A system includes a laser configured to generate a tunable optical frequency. The system also includes an optical transmitter to map baseband data to symbols represented in a digital modulation constellation, add a frequency offset to the digital modulation constellation to cause the digital modulation constellation to rotate at a rate equal to the added frequency offset, modulate the optical frequency with the rotating digital modulation constellation, and transmit the resulting modulated optical frequency. The system also includes an optical receiver to receive the transmitted modulated optical frequency and, using the tunable optical frequency, detect the rotating digital modulation constellation conveyed by the received modulated optical frequency.

公开(公告)号：US09735876B2

公开(公告)日：2017-08-15

申请号：US14796787

申请日：2015-07-10

Applicant: Cisco Technology, Inc.

Inventor： Thomas Duthel

IPC: H04B10/07 ,  H04B10/40

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：US09716555B2

公开(公告)日：2017-07-25

申请号：US15092984

申请日：2016-04-07

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.

公开(公告)号：US20170117969A1

公开(公告)日：2017-04-27

申请号：US14921222

申请日：2015-10-23

Applicant: Cisco Technology, Inc.

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

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

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：US20160226595A1

公开(公告)日：2016-08-04

申请号：US15092984

申请日：2016-04-07

Applicant: Cisco Technology, Inc.

Inventor： Thomas Duthel ,  Juergen Hauenschild ,  Theodor Kupfer

IPC: H04B10/61 ,  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。

公开(公告)号：US20150256266A1

公开(公告)日：2015-09-10

申请号：US14202293

申请日：2014-03-10

Applicant: Cisco Technology, Inc.

Inventor： Thomas Duthel ,  Juergen Hauenschild ,  Theodor Kupfer

IPC: H04B10/61 ,  H04B10/079

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。