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Theoretical Design of Band Pass Filter Utilizing Long Period Fiber Grating Having Cladding Refractive Index Perturbation

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Abstract

In this work, theoretical design of a novel band pass filter based on the turning-around-point long period fiber grating (TAP-LPFG) having cladding index modulation is proposed and demonstrated. Cladding modes are excited by introducing the incident light into the fiber cladding of the input end of the TAP-LPFG. At the grating region, only those cladding modes that satisfy the phase matching condition couple back to the fiber core to obtain the band pass transmission. It is shown that a band pass filter with –3 dB width of from ~115 to ~198 nm with the center wavelength of ~1554.4 nm can be obtained, and the suppression of more than 10 dB for the side-lobes is achieved in a wide wavelength range. This novel TAP-LPFG based device can find applications in optical communications for wide band pass filter.

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ACKNOWLEDGMENTS

This work was supported by Natural Science Foundation of China (nos. 61377021 and 61671329) and Science and Technology Plan Project of Wenzhou of China (no. H20110003).

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Authors and Affiliations

  1. College of Physics and Electronic Information Engineering, Wenzhou University, 325035, Wenzhou, China

    Jie Shen, Qiuping Ji, Yaoju Zhang, Xiukai Ruan, Zhennao Cai & Zhihong Li

  2. Institute of Laser and Optoelectronics, Wenzhou University, 325035, Wenzhou, China

    Yaoju Zhang, Xiukai Ruan & Zhihong Li

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  1. Jie Shen
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  2. Qiuping Ji
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  3. Yaoju Zhang
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  4. Xiukai Ruan
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  5. Zhennao Cai
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  6. Zhihong Li
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Correspondence to Zhihong Li.

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Shen, J., Ji, Q., Zhang, Y. et al. Theoretical Design of Band Pass Filter Utilizing Long Period Fiber Grating Having Cladding Refractive Index Perturbation. Aut. Control Comp. Sci. 52, 489–495 (2018). https://doi.org/10.3103/S014641161806010X

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  • DOI: https://doi.org/10.3103/S014641161806010X

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