An integrated design of ultra-high-speed Fiber Bragg Grating (FBG) interrogation system is illustrated and experimentally demonstrated. A Fourier Domain Mode Locked (FDML) laser is employed as a high-speed wavelength-swept light source. The use of the Mach-Zehnder interferometer (MZI) and the single-peak filter (SPF) overcomes the nonlinear effect and the scanning wavelength drift problem. A signal acquisition and peak-searching method based on the hardware is designed, allowing a real-time and multichannel interrogation. The controlled experiment has verified the feasibilities of the MZI and the SPF. Dynamic and static FBG experiments show that the integrated system has an accuracy of 0.02 nm, a stability of 0.006 nm, a linearity of 0.9994 and a 40 kHz demodulation frequency with 4 simultaneous interrogation channels.

中文翻译：

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基于FDML激光器的超高速FBG询问系统集成设计


阐述并实验演示了超高速光纤布拉格光栅（FBG）询问系统的集成设计。采用傅里叶域锁模 (FDML) 激光器作为高速波长扫描光源。马赫-曾德尔干涉仪（MZI）和单峰滤光片（SPF）的使用克服了非线性效应和扫描波长漂移问题。设计了一种基于硬件的信号采集和寻峰方法，实现了实时、多通道询问。对照实验验证了MZI和SPF的可行性。动态和静态FBG实验表明，集成系统的精度为0.02 nm，稳定性为0.006 nm，线性度为0.9994，解调频率为40 kHz，具有4个同时询问通道。