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单长周期光栅迈克耳孙(Michelson)干涉仪是由尾纤端面蒸镀高反膜的单根长周期光纤光栅构成。入射光经长周期光栅后,部分被耦合到包层中传输。经过包层和纤芯传输的光信号经尾纤端面反射后,重新耦合回到长周期光栅中,在光栅区域形成干涉。通过理论计算分析了各种因素对其光谱响应的影响。从实验上得到了干涉光谱的谐振峰波长位移与光纤段温度变化成良好的线性关系,测得其温度系数为31.3 pm/℃。表明这种结构可用于高温传感或作为波分复用滤波器。
Single long-period grating The Michelson interferometer consists of a single long-period fiber grating deposited on the end face of a pigtail with high anti-reflection film. After the incident light by the long-period grating, some are coupled to the cladding for transmission. The optical signal transmitted through the cladding and the core is reflected by the end face of the pigtail and re-coupled back into the long-period grating to form interference in the grating region. The influence of various factors on the spectral response was analyzed by theoretical calculation. Obtained from the experiment, the resonance wavelength shift of the interference spectrum has a good linear relationship with the temperature change of the optical fiber, and the temperature coefficient is 31.3 pm / ℃. This shows that this structure can be used for high temperature sensing or as a WDM filter.