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A compact, low-profile, front-end module consisting of a fused fibre coupler and a twin pin photodiode for balanced heterodyne receivers is described. Special packaging and mounting techniques ensure excellent performance from a module only 7 mm high. Figures of merit include a 16.8 GHz wideband response, an extremely low 0.8 dB optical loss, and an overall external quantum efficiency of 78%
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Tabuchi et al. (1992) studied this question.
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