Wavelength demultiplexing study on LiNbO/sub 3/ directional coupler elements using beam propagation method

The beam propagation method (BPM) was used to study a 4/spl times/4 active switch with electro-optical effects in a titanium diffused lithium niobate (LiNbO/sub 3/:Ti) based directional coupler, and the results were used to develop the design. This design is capable of de-multiplexing wavelengths from two groups, 1100 nm to 1300 nm and 1500 nm to 1600 nm.