Journal
OPTICS EXPRESS
Volume 13, Issue 21, Pages 8508-8513Publisher
OPTICAL SOC AMER
DOI: 10.1364/OPEX.13.008508
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We report a new kind of comb filters based on fiber Bragg gratings in graded-index multimode fibers. It produces two groups of spectra with a total of 36 reflection peaks that correspond to 18 principal modes and cross coupled modes. The mode indices and wavelength spacings have been investigated theoretically and experimentally. This kind of comb filters may be used to construct multi-wavelength light sources for sensing, optical communications, and instrumentations. (c) 2005 Optical Society of America.
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