采用WDM技术的光纤Bragg光栅传感网络

采用绝对测量原理的波长调制技术,光纤Bragg光栅可组成并行、串行和阵列WDM拓扑结构.分析表明,光纤Bragg光栅网络的工作原理类似于一个多宽带平面镜.利用光谱仪可测量上述光纤Bragg光栅网络的反射谱,其中,光源是宽带为～40nm的掺饵光纤放大器.当网络中的光纤Bragg光栅受扰动后,受扰光栅的反射谱发生相应的变化,即Bragg波长发生相应的偏移.结果表明,当事先确定了光纤光栅的波长调制范围,反射的峰值波长能反应光纤光栅传感网络的信息.值得注意的是～3nm的波长调制范围可满足～100℃和～2000με的参量测量.

Sensing Nets of Fiber Bragg Grating Via WDM Technology

By using the wavelength-modulated technique of the principle of absolute measurement, the fiber Bragg gratings can form the structures of parallel, serial, and arrayed WDM topologies. The analysis indicates that the principle of fiber Bragg grating networks is similar to a mirror with multiplex bandwidths. The optical analyzer can measure the reflected spectra of the above fiber Bragg grating networks, where the Er-doped fiber amplifier of ～40 nm wavelength bandwidth is used as the optical source. When the fiber Bragg grating of the networks is perturbed, the reflected spectrum of the perturbed-grating is changed accordingly, i.e., the Bragg wavelength is shifted accordingly. The result indicates that the sensing messages of the grating net can be obtained by each reflected peak wavelength, when the wavelength-modulated ranges of gratings have be defined in advance. It is noteworthy that the wavelength-modulated range of ～3 nm can be satisfied to the measurement of ～100℃ and ～2000 με.