基于PLZT高速VOA的光源低频强度噪声抑制  

Suppression of low-frequency intensity noise using PLZT based high speed VOA

作　　者：郑鑫[1] 冀军[1] 金晓峰[1] 章献民[1] 郑史烈[1] 池灏[1] Kevin Yingyin Zou 

机构地区：[1]浙江大学信息与电子工程系 [2]波士顿应用科技公司

出　　处：《仪器仪表学报》2011年第11期2623-2627,共5页Chinese Journal of Scientific Instrument

基　　金：国家自然科学基金(60971060;61071059)资助项目

摘　　要：提出一种基于掺镧锆钛酸铅(PLZT)高速可变光衰减器(VOA)实现光源低频强度噪声抑制新的技术方案。设计基于高速前馈-反馈控制技术的VOA驱动控制系统,通过高速调节,实现了光源低频波动的平滑与抑制,同时可克服PLZT的电回滞效应和环境温度变化所引起的器件参数漂移等问题,实现光信号的稳定输出。实验结果表明在控制回路信号延迟2.1μs下,系统可将频率范围在0～800 Hz的低频扰动幅度抑制到小于1%的水平。A novel scheme of low-frequency intensity noise suppression of optical source is provided.A high speed variable optical attenuator（VOA） based on PLZT transparent optic ceramic is employed to instantly compensate the low-frequency power fluctuation of light source.Through constructing a feed-forward and feed-backward control loop system with high-speed optical power monitoring and electric driving,the suppression of low-frequency intensity noise of light source is achieved and the effect caused by the hysteresis of PLZT and the temperature dependent response of VOA can be avoided.Experiment result shows that with 2.1 μs signal delay of the control loop,the fluctuation amplitude can be suppressed down to a level of less than 1% in the frequency range of 0～800 Hz.

关 键 词：光源稳定性 可变光衰减器 PLZT 前馈-反馈控制 

分 类 号：TN29[电子电信—物理电子学]