基于独热码有限状态机的斐索干涉解调相位补偿方法

针对相位调制型超弱光纤光栅水听器阵列解调过程中发生的相位翻转现象, 提出了一种基于独热码编码的有限状态机相位补偿方法, 用来在现场可编程逻辑门阵列中对翻转信号进行实时修正.将解调信号相位及其补偿条件设计在独热码编码的有限状态机中, 通过状态机内部状态的即时转移, 实现高时钟速率下光纤干涉系统解调信号的相位补偿.对多种相位补偿方式在功能仿真和实验测试中的功耗、占用资源及时序等进行对比分析, 结果表明基于独热码状态机的相位补偿方法, 不仅可以正确地解决相位翻转问题, 保证信号的完整性, 同时还可以增加信号解调动态范围, 使系统的逻辑延迟降低6%, 在水声光纤传感解调系统的高吞吐率和高时钟频率应用环境下具有一定优势.

Abstract

Aiming at the phase reversal phenomenon in the demodulation process of ultra weak fiber grating hydrophone array, a phase compensation method based on the one- hot finite state machine is proposed to modify the flip signal in realtime in field programmable gate array. The phase of the demodulated signal and its compensation conditions are set in a one-hot coded finite state machine, and the phase compensation of the demodulated signal of the optical fiber interference system is realized through the instantaneous state transition of the state machine at a high clock rate. The power consumption, occupied resources and timing results in the functional simulation and experimental test of various phase compensation methods are compared and analyzed. The results show that the phase compensation method based on the one-hot finite state machine can not only solve the phase reversal problem correctly and ensure the integrity of the signal, but also increase the dynamic range of signal demodulation, and reduce the logic delay of the system by 6%. It has advantages in the high throughput and high clock frequency applications of underwater acoustic fiber sensing demodulation system.

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赵晨光, 周次明, 庞彦东, 范典, 陈希, 刘涵洁, 周卿, 李宇潇. 基于独热码有限状态机的斐索干涉解调相位补偿方法[J]. 光子学报, 2020, 49(5): 0506001. ZHAO Chen-guang, ZHOU Ci-ming, PANG Yan-dong, FAN Dian, CHEN Xi, LIU Han-jie, ZHOU Qing, LI Yu-xiao. Phase Compensation Method of Fizeau Interference Demodulation Based on One-hot Encoded Finite State Machine[J]. ACTA PHOTONICA SINICA, 2020, 49(5): 0506001.

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