Transmission Spectrum Shifting By Varying Ambient Refractive Index in LPFG

ABSTRACTIn this paper,we introduce a new model, of long-period fiber grating, by taking the value of ambient refractive index greater than the refractive cladding index, where the difference between them must equal(0.2).The results show the change in power attenuation coefficient, where it increases with the increase in refractive ambient index. The power attenuation coefficient shift shows a dramatic change of a sharp increase from 0.00dB to 0.03788dB and 0.00dB to 0.04675dB and 0.00dB to 0.06875 dB. Here this model is used as sensor for shifting in input signal (15nm, 5nm). Key Word: Long Period Fiber Grating, single mode fiber optical