Abstract
In this paper, we computationally investigate the effects of metal coating length and coating coverage on the reflected spectrum of a long period grating (LPG) over a broad bandwidth. Simulation results indicate that coating the tail end of the fiber between the LPG and the end facet of the fiber provides a reflected spectrum that mimics the LPG transmission spectrum shape over a 400 nm bandwidth. Based on single LPG simulation results, we present the design of a distributed LPG structure containing a multiple number (n) of LPGs in reflection mode for the first time. Simulation results for n = 1, 2, and 3 are presented here to demonstrate the concept of a distributed reflective LPG design. It is expected that such a sensor will open a new window for distributed sensing using reflective LPGs.
Highlights
A long period grating (LPG) works on the principle of light coupling between the fundamental core mode and a number of co-propagating cladding modes [1,2,3]
Where neff,co is the effective refractive index of the guided core mode, nemff,cl is the effective refractive index of the m-th order cladding mode and L is the grating period. It can be seen from equation (1) that the resonance wavelengths are dependent on the grating period and the effective refractive indices of the core and the cladding modes
An LPG is limited in applications in that it can only be used as a transmission sensor, compared to a fiber Bragg grating (FBG) sensor which is convenient as a reflection mode sensor
Summary
Original content from this Abstract work may be used under In this paper, we computationally investigate the effects of metal coating length and coating coverage the terms of the Creative. Commons Attribution 4.0 on the reflected spectrum of a long period grating (LPG) over a broad bandwidth. Indicate that coating the tail end of the fiber between the LPG and the end facet of the fiber provides a. Any further distribution of this work must maintain reflected spectrum that mimics the LPG transmission spectrum shape over a 400 nm bandwidth. Based on single LPG simulation results, we present the design of a distributed LPG structure the work, journal citation containing a multiple number (n) of LPGs in reflection mode for the first time. N = 1, 2, and 3 are presented here to demonstrate the concept of a distributed reflective LPG design.
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