NDLI: Automatic bias control of electro-optic modulator in optical-fiber Brillouin sensing system

Content Provider	IEEE Xplore Digital Library
Author	Yongqian Li Lipeng Yu Anqiang Lv
Copyright Year	2012
Description	Author affiliation: Department of Electronic and Communication Engineering, North China Electric Power University, NCEPU, Baoding, China (Yongqian Li; Lipeng Yu; Anqiang Lv)
Abstract	Electro-optic modulator (EOM) is widely used in optical fiber Brillouin sensing system. However, the characteristics of EOM are sensitive to the external temperature change and mechanical vibration. It manifests a time-dependent drift of transmission curve, which leads to the decrease of extinction ratio and measurement accuracy of the sensing system. In order to set a stable EOM operation point for pulse modulation of input lightwave, an automatic bias control system with optical feedback is designed in this paper based on the observation of drift phenomenon of transmission curve and the measurement of half-wave voltage of EOM. This system can control the bias more precisely and steadily than the previous methods. Experimental results indicate that the extinction ratio of output pulse can be as high as more than 28 dB and keep stable in the whole measurement time of three hours with this system. The steady bias control and obtained high extinction ratio provide a foundation of high accuracy for optical-fiber Brillouin sensing system.
Starting Page	98
Ending Page	102
File Size	321894
Page Count	5
File Format	PDF
ISBN	9781467313315
e-ISBN	9781467313322
DOI	10.1109/ICADE.2012.6330107
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2012-07-27
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Optical fibers Voltage measurement Optical feedback Extinction ratio Sensors Brillouin scattering Electro-optic modulator Optical modulation Automatic bias control Optical pulses
Content Type	Text
Resource Type	Article

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