Abstract
Recently, coherent detection has been utilized in Brillouin optical time domain analysis (BOTDA) sensors to improve the signal-to-noise ratio (SNR) and provide a new freedom of Brillouin frequency shift (BFS) measurement through Brillouin phase shift (BPS). The generation of probe light in coherent BOTDA sensor is usually based on double sideband (DSB) phase modulation (PM), which distorts the BGS in long-rang sensing due to its low immunization to chromatic dispersion (CD). In this work, a comparative investigation has been implemented among the coherent BOTDA sensors by utilizing probe light based on DSB-PM, DSB intensity modulation (IM) and single sideband (SSB) IM. Simulation and experimental results show that the Brillouin gain spectrum (BGS) distortion caused by CD in PM case can be reduced in IM case, on the other hand, the effect of CD on the BPS leads to decoding errors in both IM and PM cases.
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