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In this paper, we computationally investigate the effects ofmetal coating length and coating coverage on the reflected spectrumof 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 thefiber provides a reflected spectrum thatmimics 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 amultiple number (n) of LPGs in reflectionmode for the first time. Simulation results for n=1, 2, and 3 are presented here to demonstrate the concept of a distributed reflective LPGdesign. It is expected that such a sensorwill open a newwindow for distributed sensing using reflective LPGs.

Towards the design of a wideband reflective long period grating distributed sensor