1.
Opt Lett
; 36(7): 1101-3, 2011 Apr 01.
Article
in English
| MEDLINE
| ID: mdl-21478996
ABSTRACT
A single-mode fiber (SMF) acousto-optic tunable filter (AOTF) with a tuning range of more than 300 nm is demonstrated. The SMF used in the experiment has a ring of symmetric holes within the cladding, which causes a larger mode-index difference between the first and the second higher-order antisymmetric modes than those of a conventional SMF. As a result, the difference in beatlengths between the core mode and the higher-order modes is highly increased, which makes it possible for the SMF AOTF to exhibit a single resonance peak in the transmission spectrum over the wavelength range of 1.3-1.6 µm for given acoustic frequencies of 3.1-3.8 MHz.