Title :
Acoustooptic Tunable Gap-Type Bandpass Filter With a Broad Stopband
Author :
Jung, Y. ; Lee, S.B. ; Lee, B.H. ; Oh, K.
Author_Institution :
Gwangju Inst. of Sci. & Technol., Seoul
Abstract :
We demonstrate a novel all-fiber gap-type tunable bandpass filter configuration that consists of a broadband hollow optical fiber (HOF) acoustooptic tunable filter (AOTF) concatenated with a narrowband single-mode fiber (SMF)-AOTF. Owing to the unique mode coupling properties of HOF-AOTF and SMF-AOTF, a narrow passband channel of a full-width at half-maximum (FWHM) of ~4 nm could be formed in a broad stopband platform of a 90-nm FWHM successfully. In this scheme, the center wavelength and rejection efficiency of both passband and stopband were found to be flexibly tunable by adjusting the frequency and the voltage of radio-frequency signals applied to individual acoustic transducers.
Keywords :
acoustic transducers; acousto-optical filters; band-pass filters; optical fibre filters; optical tuning; acoustic transducers; acoustooptic bandpass filter; acoustooptic tunable filter; all-fiber gap-type tunable bandpass filter; broadband hollow optical fiber; mode coupling; Acoustic transducers; Band pass filters; Concatenated codes; Narrowband; Optical fiber filters; Optical fibers; Passband; RF signals; Radio frequency; Voltage; Acoustooptic mode coupling; bandpass filter (BPF); optical fiber devices;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2007.902917
