Raman-based distributed temperature sensor using a 1.66usm ring type Q-switched fiber laser with adjustable pulsewidth

摘要

An optimized 1.66μm Q-switched fiber laser is demonstrated for Raman-based distributed temperature sensor. In a ring type Q-switched erbium-doped fiber laser, 850m TrueWave™ fiber is introduced to serve as both delay line fiber and Raman gain medium so that in addition to the wavelength shifted to 1.6μm, the pulse duration and the buildup time can be relatively extended. By properly controlling the fall edge of the acousto-optic switch, the pulse duration of 30-74ns with peak power of 1.3-3.3W is achieved. Based on this light source, a 2.4km Raman-based distributed temperature sensor is obtained with temperature resolution of 1°C and spatial resolution of 8m.