Long-distance fiber optic distributed acoustic sensing amplification system and method thereof

US10985520B2 · kind B2 · utility

Assignee

• University of Electronic Science and Technology of China · CN

Inventors

• Yunjiang Rao · Hangzhou City, CN
• Kang Li · 红钢城街道, CN
• Bing Han · Shanghai, CN
• Yun Fu · Milford, US
• Zengling Ran · Sichuan, CN

Key dates

• Filing date: May 31, 2019
• Grant date: Apr 20, 2021
• Expiry date: Aug 12, 2039

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01S3/2375
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

A long-distance FODAS amplification system includes a distributed amplification unit, which includes a LEAF, a pump, and a WDM; wherein the pump light passes through the WDM into the LEAF, so as to realize distributed amplification. A long-distance FODAS amplification method includes steps of: 1) modulating and amplifying a light source to obtain the probe pulse light; 2) guiding the pump light and the probe pulse light into LEAF; 3) combining the probe pulse light with the pump light to perform distributed amplification, so as to generate power-raised Rayleigh backscattered light; and 4) converting and demodulating the Rayleigh backscattered light after being output through the circulator, so as to complete distributed sensing.