公开(公告)号：US11606150B2

公开(公告)日：2023-03-14

申请号：US17134141

申请日：2020-12-24

Applicant: Infinera Corporation

Inventor： Mehdi Torbatian ,  Yuliang Gao ,  Ahmed Morra ,  Han Henry Sun ,  Yeongho Park

IPC: H04B10/61 ,  H04B10/516 ,  H04L7/00 ,  H04L69/22 ,  H04L25/03 ,  H04B10/079 ,  H04B10/2575 ,  H04L27/00 ,  H04L1/1607 ,  H04L27/26

Abstract: Joint estimation of the framer index and the frequency offset in an optical communication system are described among various other features. A transmitter can transmit data frames using pilot and framer symbols. A receiver can estimate the framer index and frequency offset using the pilot and framer symbols, and identify the beginning of a header portion of a data frame. By identifying the beginning of the header portion of a data frame, the receiver can synchronize, with less error, the data transmitted by the transmitter and the data it received. To further improve the framer index estimation, a lock indicator signal can be generated to signal to other receiver components that the estimated framer indices are reliable. The receiver can determine frequency offset and additional framer index estimations with increased reliability when performed after the lock indicator signal is generated.

公开(公告)号：US20210399808A1

公开(公告)日：2021-12-23

申请号：US17134151

申请日：2020-12-24

Applicant: Infinera Corporation

Inventor： Mehdi Torbatian ,  Yuliang Gao ,  Ahmed Morra ,  Han Henry Sun ,  Yeongho Park

IPC: H04B10/61 ,  H04B10/516

Abstract: Joint estimation of the framer index and the frequency offset in a optical communication system are described among various other features. A transmitter can transmit data frames using pilot and framer symbols. A receiver can estimate the framer index and frequency offset using the pilot and framer symbols, and identify the beginning of a header portion of a data frame. The estimation can be performed to compensate for delays such as half-symbol delays and differential group delays. By identifying the beginning of the header portion of a data frame while compensating for certain delays, the receiver can synchronize, with less error, the data transmitted by the transmitter and the data it received.