Title :
All-fiber bandpass filter with adjustable transmission using cladding-mode coupling
Author :
Starodubov, D.S. ; Grubsky, V. ; Feinberg, J.
Author_Institution :
D-STAR Technol. Inc., Manhattan Beach, CA, USA
Abstract :
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.
Keywords :
band-pass filters; diffraction gratings; optical communication equipment; optical fibre cladding; optical fibre couplers; optical fibre filters; adjustable transmission; all-fiber bandpass filter; amplitude transmission; central wavelength; cladding-mode coupling; dynamically adjustable; fiber cladding; fiber core; long-period grating pair; nonresonant light suppression; resonant light coupling; spectral range; Amplitude modulation; Band pass filters; Bragg gratings; Fiber gratings; Optical coupling; Optical fiber communication; Optical fiber devices; Optical fiber filters; Optical fibers; Resonance;
Journal_Title :
Photonics Technology Letters, IEEE
