Suppression of Double Rayleigh Scattering Induced Coherent Noise in a Remote Fiber Sensor System Using PGC Technique

Abstract:

Double Rayleigh scattering (DRS) induces coherent noises in remotely interrogated optical fiber sensor systems especially when high coherence laser sources are used. Phase generation carried (PGC) technique has been used in optical fiber sensors to overcome bias induced signal fading and eliminated incoherent noises at low frequency. In this paper we demonstrated that PGC technique can also suppress DRS induced coherent noises. In an experimental setup with total 50-km input and output lead fibers, we achieved maximum 7dB of intensity noise suppression and maximum 10dB of phase noise suppression. With PGC technique, DRS induced phase noise has been suppressed to the sensor self-noise level.

• Periodical: Advanced Materials Research (Volume 571)
• Pages: 185-189
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.571.185
• Online since: September 2012
• Authors: Chun Yan Cao, Shui Dong Xiong, Zheng Liang Hu, Yong Ming Hu
• Keywords: Double Rayleigh Scattering Induced Coherent Noise, Intensity Noise Suppression, Optic Fiber Sensor, Phase Generation Carried (PGC) Technique, Phase Noise Suppression, Remotely Interrogated

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