Chirped fiber Bragg gratings with arbitrary group delay responses using stepped-stretching fiber method |
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Authors: | RT Zheng NQ Ngo LN Binh SC Tjin JL Yang |
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Institution: | (1) Photonics Research Center, School of Electrical and Electronic Engineering, Nanyang Technological University, Nanyang Avenue, Nanyang, 639798, Singapore |
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Abstract: | We present the design and development of piece-wise stepped-chirp fiber Bragg gratings (FBGs) with arbitrary group delay responses
using a uniform phase mask in a pre-stretched fiber. The method involves writing a series of sub-gratings on a pre-stretched
fiber whose length is varied during the UV exposure process. Two motorized stages are employed to control the length of the
pre-stretched fiber in order to adjust the grating pitch at each writing step to achieve piece-wise stepped chirping of the
FBG. To demonstrate the effectiveness of the method to produce chirped FBGs with arbitrary group delay responses, a linear-chirp
FBG and a quadratic-chirp FBG were fabricated, and their measured performances agree well with analytical predictions.
PACS 42.81.-i; 42.79.Dj; 42.79.Ci |
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Keywords: | |
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