基于高双折射PCF的双Sagnac环高分辨率FBG解调系统  

High-resolution FBG demodulation system with two Sagnac loops based on high birefringence PCF

作　　者：郝文良[1] 彭军 俞本立[1] 

机构地区：[1]安徽大学光电信息获取与控制教育部重点实验室,安徽合肥230601 [2]北京市微技术研究所,北京100200

出　　处：《光电子．激光》2011年第10期1443-1446,共4页Journal of Optoelectronics·Laser

基　　金：自然科学基金资助项目(60940022);教育部博士点基金资助项目(20093401110002)

摘　　要：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 novel fiber Bragg grating （FBG） demodulation system is proposed, which is composed of two cascading Sagnac interferometer loops based on the 3 dB coupler and the polarizing beam splitter （PBS） respectively. Theoretical calculations show that the extinction ratio of the system is doubled compared with the one with a single loop, when two sections of high birefringence photonic crystal fiber（HB-PCF） have equal length in each loop. Experimental results show that the extinction ratio of interference is 43 dB. The fiber grating demodulation high-resolution is achieved by large slope linear characteristics of in- terference spectrum. Static and dynamic strain resolutions of 0.33με and 0.47 nε/√Hz are achieved,respectively. The demodulation system has good temperature stability, anti-interference ability, fast response, high sensitivity and dynamic and static characteristics of signal demodulation without restrictions. It＇s suitable for high-precision measurement based on fiber grating.

关 键 词：光纤Bragg光栅(FBG) Sagnac光纤环 高双折射光子晶体光纤(HB-PCF) 3 dB耦合器 偏振分束器 (PIGS) 

分 类 号：TN249[电子电信—物理电子学]