Title :
Polarization-independent integrated optical, acoustically tunable double-stage wavelength filter in LiNbO3
Author :
Tian, F. ; Harizi, Ch ; Herrmann, H. ; Reimann, V. ; Ricken, R. ; Rust, U. ; Sohler, W. ; Wehrmann, F. ; Westenhofer, S.
Author_Institution :
Univ. Gesamthochschule Paderborn, Germany
fDate :
7/1/1994 12:00:00 AM
Abstract :
We report a polarization-independent integrated acousto-optical double-stage wavelength filter in X-cut, Y-propagating LiNbO3. The device consists of a combination of four acousto-optical mode converters, a TE- and a TM-pass polarizer, and two polarization splitters; their specific design and properties are discussed. The filter has a bandwidth of 1.4 nm and a tuning range of 76 nm around λ1.55 μm. Maximum filter transmission is achieved with a RF drive power of only 80 mW; it excites via a single unidirectional transducer a guided surface acoustic wave driving the four polarization converters of both stages. Fiber-to-fiber insertion loss is 4.6 dB for TM- and 4.8 dB for TE-polarized waves. Multiwavelength filtering has been demonstrated
Keywords :
acousto-optical devices; integrated optics; lithium compounds; multiplexing equipment; optical filters; optical polarisers; optical waveguides; surface acoustic wave filters; tuning; wavelength division multiplexing; 1.55 mum; 4.6 dB; 4.8 dB; 80 mW; LiNbO3; RF drive power; TE-pass; TE-polarized waves; TM-pass; X-cut; Y-propagating; acoustically tunable; acousto-optical; acousto-optical mode converters; double-stage wavelength filter; fiber-to-fiber insertion loss; guided surface acoustic wave; integrated optical; maximum filter transmission; multiwavelength filtering; polarization converters; polarization splitters; polarization-independent; single unidirectional transducer; tuning range; Acoustic transducers; Acoustic waves; Bandwidth; Integrated optics; Optical fiber polarization; Optical filters; Optical polarization; Optical surface waves; Radio frequency; Surface acoustic waves;
Journal_Title :
Lightwave Technology, Journal of
