Optical space switches are basic components in both optical space-division and optical time-division switching networks. The maximum size of optical space switches is limited by both Increases In insertion loss and crosstalk at each switch element, e.g., a directional coupler in Ti:LiNbO3, in the worst path. Several space switch structures with low insertion loss and low crosstalk have been reported,1–3 but their properties are obtained by doubling the total number of switch elements.

© 1987 Optical Society of America

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