Real-Time Demonstration of Homodyne Coherent Bidirectional Transmission for Next-Generation Data Center Interconnects

We experimentally propose and demonstrate homodyne coherent detection in a short-distance data center interconnect with bidirectional fiber transmission. The transmitter in the proposed system sends the modulated signal and a continuous wave (CW) tone originating from the same laser diode (LD) over...

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Bibliographic Details
Published in:Journal of lightwave technology 2021-02, Vol.39 (4), p.1231-1238
Main Authors: Gui, Tao, Wang, Xuefeng, Tang, Ming, Yu, Yi, Lu, Yanzhao, Li, Liangchuan
Format: Article
Language:English
Subjects:
Coherence
Computer centers
Continuous radiation
Data center interconnect
Data centers
Digital signal processing
Distributed feedback lasers
homodyne coherent detection
Integrated optics
Optical fiber filters
Optical fibers
Optical interconnects
Optical polarization
optical polarization tracking
Optical receivers
Polarization
Real time
real-time demonstration
Semiconductor lasers
Tracking
Transceivers
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Summary:We experimentally propose and demonstrate homodyne coherent detection in a short-distance data center interconnect with bidirectional fiber transmission. The transmitter in the proposed system sends the modulated signal and a continuous wave (CW) tone originating from the same laser diode (LD) over the 2 lanes of a duplex fiber to the remote receiver for coherent detection. Thus, this system allows the use of an uncooled LD with a large linewidth and reduces the complexity of digital signal processing (DSP) compared to that in a classical coherent system. A successful real-time demonstration with 600-Gb/s DP-64QAM using uncooled large-linewidth DFB lasers is conducted. Automatic stabilization against polarization fluctuations of the transmitted tone is achieved by the proposed polarization-tracking integrated coherent receiver in compact silicon photonics (SiP), tracking up to 300 rad/s without a performance penalty. The phase noise caused by mismatch and the link loss budget limitations are discussed and analyzed. This study shows that the proposed system is a potentially attractive solution for future 800G and 1.6T intra-data-center optical interconnects.
ISSN:0733-8724
1558-2213
DOI:10.1109/JLT.2021.3052826