Compact polarization diversity Kramers-Kronig coherent receiver on silicon chip

Compact polarization diversity Kramers-Kronig coherent receiver on silicon chip

We design and fabricate a compact silicon photonic integrated circuit (PIC) for polarization diversity heterodyne coherent detection. This PIC integrates two optical gratings for fiber coupling and polarization diversity, two germanium single-ended photodetectors (PDs), and three multimode interfero...

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Veröffentlicht in:Optics express 2019-08, Vol.27 (17), p.23654-23660
Hauptverfasser: Zhang, Fan, Ruan, Xiaoke, Zhu, Yixiao, Chen, Zeyu, Qiu, Xiaoming, Yang, Fan, Li, Ke, Li, Yanping
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container_end_page 23660
container_issue 17
container_start_page 23654
container_title Optics express
container_volume 27
creator Zhang, Fan
Ruan, Xiaoke
Zhu, Yixiao
Chen, Zeyu
Qiu, Xiaoming
Yang, Fan
Li, Ke
Li, Yanping
description We design and fabricate a compact silicon photonic integrated circuit (PIC) for polarization diversity heterodyne coherent detection. This PIC integrates two optical gratings for fiber coupling and polarization diversity, two germanium single-ended photodetectors (PDs), and three multimode interferometers (MMIs) for power splitting and optical hybrid. The device is highly compact with a footprint of 0.68mm × 0.9mm. We test this PIC with heterodyne detection experiments of polarization division multiplexed (PDM) 32Gbaud quadrature phase shift keying (QPSK) and 16-ary quadrature amplitude modulation (16QAM) signals. The signal-signal beat interference due to square-law detection is separately mitigated with the Kramers-Kronig (KK) scheme for each of the two orthogonal polarizations. To our best knowledge, we report the first PDM-KK coherent receiver in PIC with a capability of detecting 256Gb/s 16QAM signals, which shows the most compact size among the silicon coherent receivers ever reported.
doi_str_mv 10.1364/OE.27.023654
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title Compact polarization diversity Kramers-Kronig coherent receiver on silicon chip
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