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All-fiber bandpass filter with adjustable transmission using cladding-mode coupling

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3 Author(s)
Starodubov, D.S. ; D-STAR Technol. Inc., Manhattan Beach, CA, USA ; Grubsky, V. ; Feinberg, J.

We demonstrate an all-fiber bandpass filter with 2-nm bandwidth and more than 25 dB of nonresonant light suppression (ignoring sidelobes) in a 60-nm-wide spectral range around its central wavelength. This novel device uses a pair of long-period gratings to couple resonant light from the fiber core into the cladding and then back into the core. The amplitude transmission through the filter is dynamically adjustable over a 20-dB range.

Published in:

Photonics Technology Letters, IEEE  (Volume:10 ,  Issue: 11 )