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光子学报  2005 

Ultra-Long Period Fiber Gratings Written by High-Frequency CO2 Laser Pulses
高频CO2激光脉冲写入的超长周期光纤光栅

Keywords: Waveguide optics,Optical fiber sensors,CO2 lasers pulses,ULPFG,Multi-parameter
导波光学
,光纤传感器,CO2激光脉冲,ULPFG,多参数

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Abstract:

Novel ultra-long period fiber gratings (ULPFGs) with periods of up to several millimeters, which were written by the high-frequency CO_2 laser pulses,were reported.The refractive index change occured mainly within the cladding area of the fiber and had an unsymmetrical distribution on the cross-section of the ULPFG.The resonant loss peaks of the ULPFG were generated from the coupling of the forward propagating core mode to the cladding modes of fundamental and harmonic orders.Such a ULPFG can be used to measure multi-parameters simultaneously as these resonant loss peaks have different sensitivities to temperature,strain,bending and torsion,et al.The temperature and strain characteristics of the ULPFGs with 3 mm period were investigated by experiment.Meanwhile,several new approaches of the potential applications of the ULPFG were proposed.

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