Title :
Spectral flattening by an all-fiber acousto-optic tunable filter
Author :
Östling, Dan ; Engan, Helge E.
Author_Institution :
Dept. of Phys. Electron., Norwegian Inst. of Technol., Trondheim, Norway
Abstract :
An acousto-optic notch filter based on modal coupling in a two-mode optical fiber is used to flatten the spectrum of a fiber laser. The FWHM bandwidth is optimized so that only one acoustic frequency is needed. At 1090 nm the spectral variation is reduced from 4 dB to less than 0.3 dB within a bandwidth of 6 nm
Keywords :
acousto-optical filters; fibre lasers; optical fibre couplers; optical fibre filters; tuning; 1090 nm; FWHM bandwidth; acoustic frequency; acousto-optic notch filter; all-fiber acousto-optic tunable filter; bandwidth; fiber laser; modal coupling; spectral flattening; spectral variation; two-mode optical fiber; Band pass filters; Bandwidth; Optical coupling; Optical fiber filters; Optical fiber losses; Optical fiber polarization; Optical fibers; Optical filters; Optical waveguides; Surface acoustic waves;
Conference_Titel :
Ultrasonics Symposium, 1995. Proceedings., 1995 IEEE
Conference_Location :
Seattle, WA
Print_ISBN :
0-7803-2940-6
DOI :
10.1109/ULTSYM.1995.495697
