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1. (WO2018103104) DEVICE AND METHOD FOR TRACKING LIGHT WAVELENGTH

Pub. No.:    WO/2018/103104    International Application No.:    PCT/CN2016/109318
Publication Date: Fri Jun 15 01:59:59 CEST 2018 International Filing Date: Sat Dec 10 00:59:59 CET 2016
IPC: H04B 10/61
Applicants: HUAWEI TECHNOLOGIES CO., LTD.
华为技术有限公司
Inventors: ZHAO, Jialin
赵家霖
CHEN, Wei
陈微
MAN, Jiangwei
满江伟
FU, Shengmeng
付生猛
ZENG, Li
曾理
Title: DEVICE AND METHOD FOR TRACKING LIGHT WAVELENGTH
Abstract:
Embodiments of the present application disclose a device for tracking a light wavelength. The device comprises: a filter module configured to receive a first optical signal having an unknown wavelength, perform filter processing on the first optical signal to obtain two second optical signals, and output the two second optical signals to a photoelectric conversion module; the photoelectric conversion module configured to receive the two second optical signals, perform photoelectric conversion processing on the two second optical signals to obtain two first electrical signals, and output the two first electrical signals to a control module; and the control module configured to receive the two first electrical signals and adjust, according to the two first electrical signals, operation parameters of the filter module, such that a first preset relationship between the two first electrical signals is satisfied. After the operation parameters are adjusted, the filter module is further configured to receive a third optical signal output by a tunable laser, perform filter processing on the third optical signal to obtain two fourth optical signals, and output the two fourth optical signals to the photoelectric conversion module. The photoelectric conversion module is further configured to receive the two fourth optical signals, perform photoelectric conversion processing on the two fourth optical signals to obtain two second electrical signals, and output the two second electrical signals to the control module. The control module is further configured to receive the two second electrical signals and adjust, according to the two second electrical signals, operation parameters of the tunable laser, such that a second preset relationship between the two second electrical signals is satisfied so as to align the wavelength of the third optical signal with the wavelength of the first optical signal.