An Analog EIC-PIC Receiver With Carrier Phase Recovery for Self-Homodyne Coherent DCIs

Coherent techniques, used for high-capacity optical links, conventionally use high-speed ADCs and digital signal processing, which make them power hungry. For short-reach coherent links such as data center interconnects, power consumption, form factor, cost, and latency have to be greatly reduced. C...

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Bibliographic Details
Published in:IEEE transactions on circuits and systems. II, Express briefs Express briefs, 2023-02, Vol.70 (2), p.446-450
Main Authors: Chugh, Shivangi, Ashok, Rakesh, Jain, Punit, Naaz, Sana, Sidhique, Aboobackkar, Gupta, Shalabh
Format: Article
Language:English
Subjects:
Analog circuits
analog signal processing
Circuit design
Closed loops
Coherence
Data centers
Digital signal processing
Form factors
Integrated circuits
integrated coherent receiver
Integrated optics
Lasers
Links
Optical interferometry
Optical receivers
Optical signal processing
phase detector
phase shifter
Phase shifters
Photonics
Power consumption
Recovery
SiGe integrated circuits
Silicon
Silicon germanium
Silicon photonic integrated circuits
Silicon photonics
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Summary:Coherent techniques, used for high-capacity optical links, conventionally use high-speed ADCs and digital signal processing, which make them power hungry. For short-reach coherent links such as data center interconnects, power consumption, form factor, cost, and latency have to be greatly reduced. Co-designed photonic and electronic integrated circuits, in the optical and electrical analog domains, respectively, can achieve these goals. In this brief, for the first time, we present integration of a silicon photonic integrated coherent receiver (ICR) front-end with an electronic carrier phase recovery chip, as a part of a complete coherent receiver solution. A phase shifter in the ICR (fabricated in a 220 nm silicon-on-insulator technology) receives feedback from the CPR chip, and the combination compensates for the time varying phase offset between the modulated signal and the unmodulated carrier in the closed loop configuration. In this proof-of-concept demonstration, we present experimental results obtained from the stand-alone ICR, and its system level integration with CPR chip, for QPSK signals. The technique can be extended to a higher-order modulation formats, such as 16-QAM, for capacity scaling. The proposed scheme is suitable for carrier-forwarded coherent links, such as polarization multiplexed carrier based self-homodyne links.
ISSN:1549-7747
1558-3791
DOI:10.1109/TCSII.2022.3167673