We present an optical frontend for a polarization diversity receiver comprising an all-fiber hybrid and monolithic pin-photodiode pairs. The coupler hybrid consists of fused biconic TE/TM-splitters and a power splitter. Its excess loss is as low as 0.2 dB, and the polarization extinction is better than -17 dB in a 20 nm wavelength window. The photodiode pairs are grown on a semi-insulating substrate. The fiber-photodiode interfacing technique is based on self-aligned fiber positioning in grooved silicon chips. By simple adjustment the excess noise rejection of -46 dB up to 1 GHz is achieved.
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