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浙江大学学报(工学版)
J4  2014, Vol. 48 Issue (3): 555-561    DOI: 10.3785/j.issn.1008-973X.2014.03.026
    
Closed loop measurement of half-wave voltage of an electrooptical phase modulator
CHEN Xing-fan 1,ZENG Xian-chao2,ZHOU Hu1,WANG Lei1
1.Department of Optical Engineering, Zhejiang University, Hangzhou 310027, China;
2.Research Institute of Beijing Aero Control Instrument, Beijing 100854,China
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Abstract  

By employing the time delay modulation characteristic of  the fiber optical Sagnac interferometer, a closed loop measurement method for half-wave voltage (HWV) of an eletrooptical phase modulator was designed. Such closed loop method  eliminates the influence of optical signal drift on the measure result. The digital function of the closed control loop for modulation and demodulation was designed for simulation, which shows good HWV tracking performance. Simulation results also confirm its immunity to low frequency drift error in the system, and the measure accuracy depends on the noise power only. An experiment system was set up to implement the algorithm. The test results show that: the HWV measure precision is better than 1.8×10-5 under 200 Hz sampling frequency, and it is better than 1.1×10-5 for one second average, which is restricted by the temperature sensitive of the modulator and the unstability of the test environment. The proposed method can measure the HWV of phase modulator with good precision, thus improving the performance of the fiber optical sensor, which can be also employed in precise temperature measurement with fast speed．

Published: 10 June 2018
CLC:  O 431  
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Cite this article:

CHEN Xing-fan,ZENG Xian-chao,ZHOU Hu,WANG Lei. Closed loop measurement of half-wave voltage of an electrooptical phase modulator. J4, 2014, 48(3): 555-561.

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http://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2014.03.026     OR     http://www.zjujournals.com/eng/Y2014/V48/I3/555


电光相位调制器半波电压闭环测量方法

以光纤Sagnac干涉仪为基础,利用其时延差分的调制特性,建立一套电光相位调制器半波电压的闭环测试方法,消除了由光强等低频波动引入的测量误差.设计相应的调制解调的闭环数字方程,完成了仿真实验.仿真结果表明：所设计的闭环方法能快速地追踪半波电压,其测量精度和系统的低频波动无关,测量精度受制于测试系统的宽谱噪声信号.搭建实验系统,实现闭环算法,相位调制器样品的半波电压测试结果表明：在200 Hz的测试频率下该实验系统的测量相对精度优于1.8×10-5,1 s平均测试的相对精度优于1.1×10-5,实验系统测量精度受限于被测相位调制器的温度敏感性和环境参数的稳定性.该测量方法能够精确测量高精度光纤传感系统中相位调制器的半波电压,也可应用于设计高精度的温度传感器.

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