Integrated optical, TE- and TM-pass, acoustically tunable, double-stage wavelength filters in LiNbO/sub 3/

摘要

Two types of double-stage, acousto-optical wavelength filters have been fabricated in X-cut, Y-propagating LiNbO/sub 3/ by an integration of TE- and TM-pass polarisers and acousto-optical mode convertors in a doubly confined acoustical/optical singlemode waveguide. Filter characteristics with narrow bandwidth (>2 nm), a tuning range of approximately 60 nm around lambda =1.55 mu m and strongly reduced residual sidelobes have been obtained.