SIGNAL DETECTION METHOD AND OPTICAL TIME DOMAIN REFLECTOMETER

WIPO Patent Application WO/2021/204009

A1

Provided are a signal detection method and an optical time domain reflectometer. The optical time domain reflectometer comprises a controller, a laser emission apparatus, a signal modulation apparatus, a coupler, a signal coupling apparatus, and a receiver. The laser emission apparatus outputs a first optical signal within a first time period. The signal modulation apparatus generates a pulse signal according to the first optical signal and outputs the pulse signal to an optical fiber within a second time period, wherein the first time period comprises the second time period. The receiver will receive a scattered signal from an optical fiber, wherein the frequency of the scattered signal is the same as the frequency of the first optical signal. Thereafter, the laser emission apparatus outputs a second optical signal in a third time period, wherein the frequency of the second optical signal is different from the frequency of the first optical signal. The second optical signal, acting as a local oscillator signal, can interfere with the scattered signal in the receiver, and the receiver achieves coherent detection.

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JP2003028697	OPTICAL FIBER WATER TEMPERATURE/LEVEL SENSOR

PAN CHAO (CN)
LI ZILIANG (CN)
DENG NING (CN)

PCT/CN2021/083748

October 14, 2021

March 30, 2021

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HUAWEI TECH CO LTD (CN)

G01D5/353; G01K11/32; H04B10/071

CN105490738A	2016-04-13
CN110553674A	2019-12-10
CN102589592A	2012-07-18
US20190013862A1	2019-01-10
CN202010273424A	2020-04-09

SHENPAT INTELLECTUAL PROPERTY AGENCY (CN)

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