Distributed Raman amplification-based Brillouin optical time domain analysis system

Abstract

The invention discloses a bidirectional distributed Raman amplification-based Brillouin optical time domain analysis system. The system comprises a laser 1, a coupler 3, a first electro-optical modulator 6, a second electro-optical modulator 17, a polarization scrambler 8, a first erbium-doped fiber amplifier 9, a second erbium-doped fiber amplifier 18, an optical circulator 12, a tunable filter 11, a detector 10, a data acquisition processing system 7 and a Raman amplification system. In the system, the bidirectional distributed Raman amplification technology is applied in the Brillouin optical time domain analysis system to improve the distribution evenness of Brillouin detection signal gain on a whole section of a sensing fiber, so that the temperature / strain resolution of the whole section of the sensing fiber can be ensured, and long distance distribution sensing in true sense can be realized.

Description

technical field [0001] The invention relates to the field of optical fiber technology, in particular to a method for improving the performance of a Brillouin optical time-domain analysis system by applying a distributed Raman amplification technology. Background technique [0002] Distributed fiber optic sensor is a new type of sensing technology that has been studied in recent years. Because it can sense the spatial distribution of strain and temperature on the transmission path and information that changes with time, distributed fiber optic sensors are used in multi-storey buildings, bridges, dams, aircraft, It has an important application prospect in the safety detection of major structures and equipment such as oil wells. [0003] Distributed sensing technology based on Brillouin scattering has higher measurement accuracy, measurement range and spatial resolution in temperature and strain measurement than other sensing technologies, so this technology has been widely con...

AI Technical Summary

Problems solved by technology

[0005] 1. Because the power of the Brillouin pump wave is only strong at the front end of the fiber, but at the back end of the fiber, due to the loss of the fiber and the consumption of the Brillouin probe light, the intensity drops sharply, which seriously affects the measurement resolution at the back end of the fiber;

Images