Impact of dither-based Electro-Optic Modulator bias control on distributed Brillouin sensing system

Qiao Sun; Xiaobo Tu; Shilin Sun; Xiaoyang Hu; Zhou Meng

doi:10.1117/12.2200973

8 October 2015 Impact of dither-based Electro-Optic Modulator bias control on distributed Brillouin sensing system

Qiao Sun, Xiaobo Tu, Shilin Sun, Xiaoyang Hu, Zhou Meng

Proceedings Volume 9679, AOPC 2015: Optical Fiber Sensors and Applications; 967911 (2015) https://doi.org/10.1117/12.2200973
Event: Applied Optics and Photonics China (AOPC2015), 2015, Beijing, China

Abstract

In most distributed Brillouin sensing systems, it is crucial to keep the long-term stability of the electro-optic modulator (EOM) operating point. The dither-tone based bias control methods are widely adopted in this kind of systems for its robustness and reliability, but the low frequency dither tone (a few kilohertz) added into the dc bias port of the EOM may have a detrimental impact on the sensing performance of the Brillouin sensing system. Experimental results show that the dither frequency should not be set around quarter of the pulse repetition rate or its multiples, and the employed dither amplitude should be in the range of 0.003V_π to 0.015V_π (V_π is the RF half-wave voltage of the EOM), in order to overcome the limitation of dither tone based bias control techniques in BOTDA systems. These results will provide guidelines to improve the performance of the Brillouin sensing systems using dither-based EOM bias control method.

Citation Download Citation

Qiao Sun, Xiaobo Tu, Shilin Sun, Xiaoyang Hu, and Zhou Meng "Impact of dither-based Electro-Optic Modulator bias control on distributed Brillouin sensing system", Proc. SPIE 9679, AOPC 2015: Optical Fiber Sensors and Applications, 967911 (8 October 2015); https://doi.org/10.1117/12.2200973

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