A monolithic electro-optical 2 × 2 crossbar has been developed. The multimode network consists of channel waveguides and four crosspoint switches integrated in a LiTaO3 plate. Matrix switching loss was 11 dB and crosstalk was −16 dB for TM-polarised 0.07-n.a. light.
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Soref et al. (1978) studied this question.