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A study on relation between ultra-wideband filtering characteristics and structural parameters for a chirped long-period fiber grating

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Abstract

The ultra-wideband filtering characteristics of chirped long-period fiber gratings are analyzed based on the coupled-mode theory. The influences of structural parameters such as chirp coefficient, grating length and grating period on the ultra-wideband filtering characteristics are also studied numerically. The transmission spectrum bandwidth increases with the increase of the chirp coefficient, the grating length, the period and the refractive index modulation, but it decreases with the increase of fiber cladding radius. The cladding modes propagating in the fiber grating have important effects on the transmission spectra bandwidth and the center resonance wavelength. When the transmission spectra corresponding different cladding modes overlap with each other, the transmission spectra bandwidth of chirped long-period fiber gratings could be expanded to hundreds of nanometres. The results are useful for optimal design of chirped long-period fiber grating filters.

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Authors and Affiliations

  1. School of Automobile Engineering, Linyi University, Linyi, 276005, Shandong, China

    Y. Yang

  2. School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai, 200093, China

    Y. Yang

  3. Laboratory of Photo-electric Functional Film Sensors, College of Science, University of Shanghai for Science and Technology, Shanghai, 200093, China

    Y. Yang, Y. Cao & X. Chen

Authors
  1. Y. Yang
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  2. Y. Cao
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  3. X. Chen
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Correspondence to Y. Yang.

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Yang, Y., Cao, Y. & Chen, X. A study on relation between ultra-wideband filtering characteristics and structural parameters for a chirped long-period fiber grating. Indian J Phys 87, 297–302 (2013). https://doi.org/10.1007/s12648-012-0197-9

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  • DOI: https://doi.org/10.1007/s12648-012-0197-9

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