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Optica Publishing Group
  • Journal of Lightwave Technology
  • Vol. 25,
  • Issue 8,
  • pp. 2129-2134
  • (2007)

Characterization of Single-Mode Fiber With Fiber Bragg Gratings for the Design of Long-Period Gratings

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Abstract

We propose a simple method to determine the dispersion characteristics of the core mode and the cladding modes of a single-mode fiber for the design of long-period gratings (LPGs). The method is based on measuring the effective indexes of the core mode and the cladding modes from the transmission spectra of a number of slightly tilted fiber Bragg gratings (FBGs) that are composed of properly separated Bragg wavelengths. By using four FBGs written in a photosensitive fiber, we obtained 19 phase-matching curves for the design of LPGs over the (S + C + L)-band, which correspond, respectively, to the couplings between the core mode and the first 19 symmetric cladding modes of the fiber. The accuracy of the phase-matching curves is verified with a number of LPGs fabricated in the same fiber using various grating pitches.

© 2007 IEEE

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