基于可调谐半导体激光器的高分辨率多路复用光纤光栅波长解调系统  

High-Resolution Multiplexed Fiber Bragg Grating Wavelength Interrogation System Based on Tunable LD

作　　者：崔巍[1] 苏建加[1] 姜培培[1] 吴波[1] 沈永行[1] 

机构地区：[1]浙江大学光电科学与工程学院现代光学仪器国家重点实验室,杭州310027

出　　处：《光子学报》2016年第7期59-66,共8页Acta Photonica Sinica

基　　金：国家自然科学基金(No.10377016)资助~~

摘　　要：构建了一套高分辨率的可复用光纤光栅波长解调系统.采用波长调谐范围为1 546nm至1 558nm的紧凑型可调谐半导体激光器作为光源,来提高系统的紧凑性、波长分辨率以及响应速度,加入标准气室作为波长基准以提高系统的长期稳定性.使用多个电极电流共同调谐的办法,实现了在12nm范围内半导体激光器波长分辨率高达1pm的准连续波长扫描.利用重心算法提高光纤光栅中心波长的解调精确度和稳定性,并对解调过程进行模拟.解调系统的波长分辨率优于1pm,精确度接近2pm.整个光纤布拉格光栅温度传感系统在1 550nm附近实现了0.1℃的温度分辨率.A compact and high-resolution multiplexed Fiber Bragg Grating （FBG） wavelength interrogation system was reported. A compact tunable Laser Diode（LD） covering wavelength from 1 546 nm to 1 558 nm is applied as the light source to improve the simplicity, wavelength resolution and the response rate of the FBG demodulation system. A standard HCN gas-cell is incorporated as the wavelength reference. The 1 pm quasi-continuous wavelength tuning of the LD over 12 nm is realized by the combination of current control on multiple electrodes. A spectral centroid algorithm is used to determine the FBG＇s wavelentgth, which results in robustness of the demodulation and then the high accuracy of the FBG interrogation. The demodulation process is simulated. The experimental results show an excellent wavelength resolution of better than 1 pm and precision of about 2 pm, which corresponds to temeprature resolution of 0.1℃ around 1 550 nm in an FBG-based fiber sensor.

关 键 词：光纤光学 光纤光栅传感系统 可调谐半导体激光器 重心算法 

分 类 号：O433.1[机械工程—光学工程]