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A low-crosstalk structure for a 1*2 optical switch using twisted nematic liquid crystal (TN-LC) cells is proposed. Low crosstalk can be obtained by using a walkoff polarizing beam splitter between two TN-LC cells mutually controlled in opposite states. A 1*2 polarization-independent optical switch is assembled using single-mode fibers. Its insertion loss and crosstalk, in both switching modes, are>
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Y. Fujii (1993) studied this question.
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