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提出了一种基于高双折射光子晶体光纤(HB-PCF)的双Sagnac环的级联结构。理论计算表明,由光环形器构成的该级联结构,如双环中HB-PCF长度相等,与单环相比,可使干涉消光比增加1倍;实验中,双环结构输出干涉消光比达到43dB。基于边缘滤波器原理,实现了光纤Bragg光栅(FBG)高分辨率解调,静、动态应变分辨率分别达到了0.33με、0.47nε/Hz。本文解调系统具有温度稳定性好、抗干扰能力强、响应速度快、灵敏度高以及动、静态信号解调不受限制等特点,特别适用于FBG的高精确度传感测量。
A cascade structure of double Sagnac rings based on high birefringence photonic crystal fiber (HB-PCF) is proposed. Theoretical calculations show that the cascade structure composed of optical circulators, such as the HB-PCF in the double ring, has the same length, which can increase the interference extinction ratio by a factor of two compared with the single ring. In the experiment, the output interference extinction ratio of the double ring structure reaches 43dB . Based on the principle of edge filter, the high resolution demodulation of fiber Bragg grating (FBG) is realized. The resolution of static and dynamic strain reaches 0.33με and 0.47nε / Hz, respectively. This demodulation system has the characteristics of good temperature stability, strong anti-interference ability, fast response, high sensitivity and unrestricted demodulation of moving and static signals, and is especially suitable for high-precision FBG sensing measurement.