Optimization of long-period grating inscribed in large mode area photonic crystal fiber for design of bandstop filter |
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Authors: | Faramarz E. Seraji S. Farsinezhad Leila Chehreghani Anzabi |
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Affiliation: | Optical Communication Group, Iran Telecom Research Center, Tehran, Iran |
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Abstract: | By inscribing long period grating (LPG) in a photonic crystal fiber (PCF), optical filters for communication wavelengths can be fabricated. In this paper, by utilizing coupled-mode theory and enhanced improved vectorial effective index method, a design of bandstop filter based on optimal LPG parameters is presented where the optimized full-width half-maximum (FWHM), the number (N) and total length of gratings of LPGs (L) are determined. As a result, by the determination of optimized LPG parameters with an optimum length of Lopt=6.5 mm and optimum number of grating Nopt=27 inscribed in the PCF, a bandstop optical filter with FWHM=1 nm is designed. |
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Keywords: | Bandstop filter Design Long-period grating Photonic crystal fiber Optimization |
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