A simple and successful design of a new active coupler for plastic optical fibres (POF) is presented. It consists of a 2×2 coupler with a PDLC film sandwiched in it, which takes advantage of the electro-optic effect of the PDLC. More than 3 dB of variation can be achieved by applying electric fields below 1.5 V/µm.
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Zubía et al. (2002) studied this question.
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