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A monolithically integrated silicon coherent receiver based on a novel scheme with a crossing-free 90 $^{\circ}$ hybrid optical coupler and two balanced germanium photodetectors is reported. The integrated receiver is compact (footprint is $0.8\times 1.0\ \hbox{mm}^{2}$), and it is demonstrated by working with single-polarization 56-Gb/s quadrature phase-shift keying (QPSK) and 80-Gb/s 16-quadrature...
A monolithically-integrated silicon coherent receiver is reported for up to 56-Gb/s QPSK and 80-Gb/s 16-QAM signals. The receiver incorporates balanced germanium photodiodes, on-chip capacitors, and a novel hybrid design free of waveguide crossings.
We demonstrate a monolithically-integrated silicon photonic receiver for 100 Gb/s PDM-DQPSK signals. The device is realized with a 2D grating coupler, four Mach-Zehnder delay interferometers with phase shifters and four germanium balanced photodetectors.
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