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 nmbandwidth. 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.
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Rana, Sohel; Kandadai, Nirmala; and Subbaraman, Harish. (2020). "Towards the Design of a Wideband Reflective Long Period Grating Distributed Sensor". Journal of Physics Communications, 4(6), 065015-1 - 065015-8. https://dx.doi.org/10.1088/2399-6528/ab9dd6