Title:
METHOD AND APPARATUS FOR COHERENT TRANSMITTER CALIBRATION
Document Type and Number:
WIPO Patent Application WO/2021/078048
Kind Code:
A1
Abstract:
Methods and apparatus for coherent transmitter calibration are provided that employ direct detection (DD) using one single photodetector (PD). The provided method and apparatus do not require hardware for coherent reception, or additional ADCs for quality control. An additional optical tone is added to a QAM optical signal that is outside the band of the QAM optical signal. The result of this is that after direct detection, there is a correlation between the real and imaginary parts, and the imaginary part can be recovered with a Hilbert transform. The estimated QAM optical signal obtained by direct detection is used to perform a transmitter factory calibration method to calibrate for one or more transmitter impairments and/or to perform in-line self-calibration.
Inventors:
NG WING CHAU (CA)
TANG XUEFENG (CA)
ZHANG ZHUHONG (CA)
TANG XUEFENG (CA)
ZHANG ZHUHONG (CA)
Application Number:
PCT/CN2020/120907
Publication Date:
April 29, 2021
Filing Date:
October 14, 2020
Export Citation:
Assignee:
HUAWEI TECH CO LTD (CN)
International Classes:
H04B17/15
Foreign References:
| CN102422571A | 2012-04-18 | |||
| US9819412B1 | 2017-11-14 | |||
| US20180323871A1 | 2018-11-08 | |||
| US20170324476A1 | 2017-11-09 |
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