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Long-period fiber gratings as band-rejection filters

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6 Author(s)
A. M. Vengsarkar ; Dept. of Electr. Eng., Arizona Univ., Tucson, AZ, USA ; P. J. Lemaire ; J. B. Judkins ; V. Bhatia
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We present a new class of long-period fiber gratings that can be used as in-fiber, low-loss, band-rejection filters. Photoinduced periodic structures written in the core of standard communication-grade fibers couple light from the fundamental guided mode to forward propagating cladding modes and act as spectrally selective loss elements with insertion losses act as backreflections <-80 dB, polarization-mode-dispersions <0.01 ps and polarization-dependent-losses <0.02 dB

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Journal of Lightwave Technology  (Volume:14 ,  Issue: 1 )