Abstract
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 amplitude modulation (16-QAM) signals. In particular, QPSK transmission that is back-to-back at 28 Gbaud shows a bit-error rate (BER) below $10^{-4}$ for an optical signal-to-noise ratio (OSNR) lower than 17 dB, whereas 16-QAM at 20 Gbaud shows a BER not better than $3^{\ast}10^{-2}$ because of the nonideal behavior of the device. Reasons for the performance limitations are discussed.
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