长周期光纤光栅拐点对外界折射率的敏感性

Sensitivity Characteristics of Long-period Fiber Grating which Have Turning Point as a Function of External Refractive Index

应用耦合模理论,研究了长周期光纤光栅拐点传感对外界折射率的敏感性,包括耦合波长、耦合系数以及透射谱随外界折射率变化的情况.

On the base of the theory of the cladding mode, the sensitivity characteristics of long-period fiber grating which have turning point as a function of external refractive index was researched, including the change of resonance wavelength and coupling coefficients and trans- mission spectrum with the change of external refractive index. The result has a theoretics guidance to exploit long-period fiber grating highly sensitive sensor.