Spectroscopy and Spectral Analysis, Volume. 42, Issue 7, 2241(2022)

Using Fiber Grating Cascade Structure to Realize Fiber Delay Line

Chong WANG, Huan DU, Jing WANG, Jing WANG, and Jing-hua WANG
Author Affiliations
  • School of Electronic Engineering, Xi’an University of Posts and Telecommunications, Xi’an 710121, China
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    Figures & Tables(12)
    Block diagram of system
    Block diagram of optical delay module
    Optical fiber reel
    Schematic diagram of fiber grating
    Reflectance spectrum of center wavelength 1 550, 1 551, 1 552 and 1 553 nm
    Six apodization function apodization diagram(a): Blackman function; (b): Sinc function; (c): Tanh function; (d): Hamming function; (e): Gauss function; (f): Cauchy function
    Variation of fiber loss with radius under different working wavelengths
    Waveform test system
    Waveforms of different transmission distances when the output frequency is 2 000 Hz
    Block diagram of the test system
    The power difference relative to the straight optical fiber when the output frequency is 2 000 Hz
    • Table 1. Comparison of different apodization functions

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      Table 1. Comparison of different apodization functions

      Apodization functionExpressionParameter valueAnalysis result
      Blackman functionf(z)=1+(1+D)cos2πzL+Dcos4πzL2(1+D)D=0.18The side lobes are not eliminated completely, and the reflection spectrum is deviated seriously from the center wavelength
      Sinc functionf(z)=sincA122zLBA=2
      B=6
      The side lobes are not eliminated completely, and the reflection spectrum deviates from the center wavelength
      Tanh functionf(z)=1+tanhβ(1-22zLα)α=1
      β=1
      Most of the side lobes are eliminated, but the top envelope is reduced
      Hamming functionf(z)=1+Hcos2πzL1+HH=0.8Basically eliminate the reflection spectrum side lobes to achieve the effect of filtering side lobes, but the reflection spectrum envelope is severely reduced
      Gauss functionf(z)=e-G(z2)2G=8Completely eliminate side lobes, and reduce the envelope at the top of the reflection spectrum, and have the better results
      Cauchy functionf(z)=1-2zL21-2CzL2C=0.5Completely eliminate the side lobes, have little effect on the envelope, and have the best effect
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    Chong WANG, Huan DU, Jing WANG, Jing WANG, Jing-hua WANG. Using Fiber Grating Cascade Structure to Realize Fiber Delay Line[J]. Spectroscopy and Spectral Analysis, 2022, 42(7): 2241

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    Paper Information

    Category: Orginal Article

    Received: Apr. 27, 2021

    Accepted: --

    Published Online: Nov. 16, 2022

    The Author Email:

    DOI:10.3964/j.issn.1000-0593(2022)07-2241-06

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