光纤水听器时分复用系统通过3×3耦合器信号解调的一种新算法

张华勇; 王利威; 施清平; 田长栋; 张敏; 廖延彪

doi:doi:10.3788/cjl201138.0505011

中国激光, 2011, 38 (5): 0505011, 网络出版: 2011-05-09

光纤水听器时分复用系统通过3×3耦合器信号解调的一种新算法下载： 536次

A New Demodulation Method for Time Division Multiplexing System of Fiber-Optic Hydrophone Using a 3×3 Coupler

论文大纲

张华勇 ^*王利威施清平田长栋张敏廖延彪

作者单位

清华大学电子工程系光纤传感研究中心，北京 100084

摘要

提出了在光纤水听器时分复用系统中采用3×3耦合器解调信号的一种新算法。在该方案中，光纤水听器仍为2×2耦合器结构，3×3耦合器作为匹配干涉仪，利用其三路输出的线性组合和数字反正切技术实现信号解调，解调中使用的参数通过奇异值分解和椭圆拟合得到。该方案不需要载波调制，可实现光纤水听器近似等臂干涉，有利于抑制系统相位噪声。算法的运算量小且适用于一般的非对称3×3耦合器，解调的动态范围很大。最终利用该方案实现了两路光纤水听器时分复用的实验系统，在1 kHz时，系统的噪声本底为31 μrad/Hz，动态范围超过125 dB，串扰小于64 dB。

Abstract

A new demodulation method is proposed for time division multiplexing system of fiber-optic hydrophone using a 3×3 coupler. In such a scheme, the fiber-optic hydrophone is made by a 2×2 coupler and 3×3 coupler is used as path-matched differential interferometer. The signal is demodulated by linear combination of the three outputs and digital inverse arctangent approach. Parameters used in demodulation are estimated by singular-value decomposition and ellipse fitting. There is no carrier in this demodulation scheme. In addition, fiber-optic hydrophone can form a nearly zero path difference interferometer which is good for reducing system phase noise. The demodulation method is very simple and feasible for a general asymmetric 3×3 coupler. Correspondingly, it is easy to get a large dynamic range for the demodulated signal. A time division multiplexing experiment system with two sensors is set up. At 1 kHz noise floor, dynamic range, and cross talk are less than 31 μrad/Hz, more than 125 dB, less than 64 dB, respectively.

参考文献

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张华勇, 王利威, 施清平, 田长栋, 张敏, 廖延彪. 光纤水听器时分复用系统通过3×3耦合器信号解调的一种新算法[J]. 中国激光, 2011, 38(5): 0505011. Zhang Huayong, Wang Liwei, Shi Qingping, Tian Changdong, Zhang Min, Liao Yanbiao. A New Demodulation Method for Time Division Multiplexing System of Fiber-Optic Hydrophone Using a 3×3 Coupler[J]. Chinese Journal of Lasers, 2011, 38(5): 0505011.

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