EOM Bias Control Scheme in BOTDR System
In Bhllouin optical-fiber time-domain reflectometry (BOTDR) system,it is important to keep the pulse energy uniform for a constant extinction ratio,so an Electro-optic modulator (EOM) is used to turn the probe beam on and off to produce the pulsed probe beam.However EOMs job characteristics slowly changes due to many factors,which led to the instability of the pulse energy after modulation. Therefore drift compensation is absolutely necessary .In this paper,the use of low-frequency sinusoidal signal as the disturbance signal to judge the drift direction of the EOM performed admirably,and highly improved the extinction ratio,which increased from 7.36dB to about 25dB.So with this bias voltage control system,a higher sensing accuracy can be getting in the BOTDR system.
Electro-optic modulator Virtual instrument.Bias voltage control.BOTDR
Chengqun Yin Liguo Liu Anqiang Lv Yongqian Li
School of Electrical and Electronic Engineering,North China Electric Power University,Baoding 071003,China
国际会议
2009 9th International Conference on Electronic Measurement & Instruments(第九届电子测量与仪器国际会议 ICEMI2009)
北京
英文
378-381
2009-08-16(万方平台首次上网日期,不代表论文的发表时间)