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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