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Optica Publishing Group
  • Journal of Lightwave Technology
  • Vol. 30,
  • Issue 8,
  • pp. 1143-1149
  • (2012)

The Use of a Fiber Comb Filter Fabricated by a CO2 Laser Irradiation to Improve the Resolution of a Ratiometric Wavelength Measurement System

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An edge filter-based ratiometric wavelength measurement system is modeled and analyzed in this paper. The results confirm that the noise of input signal and photodetectors limits the resolution of the wavelength measurement system. The achievable resolution is calculated for a given noise level of the input signal and photodetectors' resolution. An improved ratiometric wavelength measurement system consisting of two fiber comb filters is presented both theoretically and experimentally, which performs coarse and fine wavelength measurements simultaneously. The resolution of the system is significantly improved to better than 5pm while maintaining the potential for high measurement speed and wide measurable wavelength range.

© 2011 IEEE

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