Abstract
Distributed Brillouin laser sensor (DBLS) has shown its potential in terms of high signal-to-noise ratio (SNR) temperature/strain sensing without frequency sweeping. However, the discontinuous lasing in previous reports leads to limited resolution points and longer measurement time. In this letter, a structure optimization was proposed for DBLS to realize the continuous lasing and fully distributed sensing. Furthermore, a comprehensive experimental investigation on the sensing influence of key parameters, including net gain of lasing loop, peak power of pump pulse, and tolerance to the mismatch between pump pulse period and roundtrip time, has been explored detailly. The underlined physical mechanisms were also clarified experimentally. Compared with traditional Brillouin optical time-domain reflectometry (BOTDR), the substantially reduced standard deviation (STD) for distributed temperature sensing was demonstrated under the same averaging times. Related study can provide a new insight and design guideline for DBLS.
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