Transmission spectrum shifting by varying ambient refractive index in LPFG

Abstract EN

In 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).