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Thermally switchable and discretely tunable comb filter with a linearly chirped fiber Bragg grating

机译：具有线性chi光纤布拉格光栅的热切换和离散可调梳状滤波器

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摘要

We propose and experimentally demonstrate a novel switchable and discretely tunable comb filter based on a thermally induced linearly chirped fiber Bragg grating. Experimentally we achieved a thermally induced optical bandpass filter that has eight switchable passband peaks with peak separations of 1.6 and 3.2 nm, a very narrow bandwidth (as small as 10 pm) of each peak, a tunable range of 16.5 nm, and a greater than 25 dB rejection ratio. Two spectral peaks separated by only 0.8 nm were also obtained with this comb filter. This filter provides the unique advantages of an all-fiber structure, switchable spectral peaks, independent tuning of the center wavelength and wavelength spacing of the spectral peaks, low polarization sensitivity, simple structure, ease of fabrication, and low cost.
机译：我们提出并实验证明了一种基于热感应线性chi光纤布拉格光栅的新型可切换和离散可调梳状滤波器。通过实验，我们获得了一个热感应光带通滤波器，该滤波器具有八个可切换的通带峰，其峰距分别为1.6和3.2 nm，每个峰的带宽非常窄（小至10 pm），可调范围为16.5 nm，并且大于25 dB的抑制比。用该梳状滤波器还获得了仅相隔0.8 nm的两个光谱峰。该滤光片具有以下优势：全光纤结构，可切换的光谱峰，中心波长的独立调谐和光谱峰的波长间隔，偏振灵敏度低，结构简单，易于制造且成本低。

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