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A low-crosstalk structure for a 2*2 optical switch using twisted nematic liquid crystal (TN-LC) cells is proposed. Low crosstalk can be obtained by alternately arranging three TN-LC cells and two walkoff polarizing beam splitters. A 2*2 optical switch is assembled with 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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