公开(公告)号：US12034485B1

公开(公告)日：2024-07-09

申请号：US17863968

申请日：2022-07-13

Applicant: Cisco Technology, Inc.

Inventor： Hongbin Zhang ,  Christian Rasmussen

IPC: H04B10/548 ,  H04B10/61 ,  H04B10/80

CPC classification number: H04B10/548 ,  H04B10/613 ,  H04B10/807

Abstract: A method, system, and apparatus for a coherent optical breakout; wherein the optical breakout has a laser; wherein the coherent optical breakout has a set of optical connections; wherein the set has at least two optical connections; wherein the coherent optical breakout enables coherent optical communication of X Gbs across each of the set of optical connections.

公开(公告)号：US12283996B1

公开(公告)日：2025-04-22

申请号：US18098764

申请日：2023-01-19

Applicant: Cisco Technology, Inc.

Inventor： Hongbin Zhang ,  Sheng Zhang ,  Tymon Barwicz

IPC: H04B10/588

Abstract: A method, system and apparatus for mapping a symbol from a N-QAM constellation into a binary bit set, where N is the number of symbols in the constellation, and reducing the length of the binary bit set according to at least one property of nonlinear distortion by generating a lookup table (LUT) address from a LUT address generator, and adding the LUT address to a LUT of size smaller than N{circumflex over ( )}(2M+1), where 2M is the number of neighboring symbols to be stored.

公开(公告)号：US12250101B1

公开(公告)日：2025-03-11

申请号：US18155886

申请日：2023-01-18

Applicant: Cisco Technology, Inc.

Inventor： Hongbin Zhang

IPC: H04B10/00 ,  H04B10/40 ,  H04L25/03

Abstract: Disclosed is a coherent optical transceiver for optical communication including a transmitter, a receiver, and a PIC. The transmitter includes a DAC and a driver. A modulator in the PIC limits a signal spectrum of an output optical signal within a Nyquist frequency band. The receiver receives an input optical signal from the PIC and converts the input optical signal to an input analog electrical signal. An ADC converts the input analog electrical signal into an input digital electrical signal indicative of the input optical signal at an ADC sampling rate. The DSP includes a linear filter to equalize intersymbol interference, a post filter, and an MLSE to determine symbols corresponding the input optical signal. The driver and the post filter are first order filters with transfer function G(z)=1+az−1, where a is between 0 and 1.