Abstract
A novel compact structure suitable for the realization of a 2 × 2 bistable integrated optical switch using ferroelectric liquid crystal is reported. The switch consists of a vertical coupler formed by two Ag+-Na+ ion-exchanged single-mode channel waveguides diffused in two BK7 glass substrates of a surface stabilized liquid crystal cell. The coupling properties, and thus the switching state (bar or cross), of this structure can be controlled by electrically reorienting the director of the aligned liquid crystal layer. The device was simulated and optimized at λ = 1550 nm by using a beam propagation method algorithm. The simulation of the TE 00 mode propagating along the designed device showed crosstalk attenuation and losses of 42.5 dB and 0.49 dB respectively with a coupling length of 141 μ m.
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