Feasibility of Non-Collinear TeO2 Acoustic-Optic Tunable FiltersUsed in the Optical Communication

Abstract

The characteristics and the structure of TeO2 acoustic-optictunable filter used in communication are discussed briefly based on theacoustic-optic theory and it is shown that a large optical incidentangle and a long interaction length are suitable for the opticaladd/drop multiplexer based on the TeO2 acoustic-optic tunablefilter. The distribution of acoustic energy flow in the device supportsthe large optical incident angle. The long interaction length dependson the change of the device structure to some degree. The measuredresults of the samples show that the diffraction efficiency reaches at96% in the tuning range larger than 100 nm and the bandwidth is about2 nm. It can be found that there is a good consistency with the basictheoretical mode. The optimized design result shows that thediffraction efficiency can arrive at 100%, and the bandwidth can beless than 0.4 nm. Thus, the non-collinear TeO2 acoustic-optic tunablefilter can play an important role in the coming general opticalnetwork.