Experimental investigation of DSP complexity of low-power beyond-300G IM-DD short-reach links

Paikun Zhu; Yuya Yamaguchi; Yuki Yoshida; Tien Dat Pham; Masayuki Motoya; Shingo Takano; Ryo Shimizu; Kouichi Akahane; Ken-ichi Kitayama

doi:10.1117/12.2692260

9 March 2024 Experimental investigation of DSP complexity of low-power beyond-300G IM-DD short-reach links

Paikun Zhu, Yuya Yamaguchi, Yuki Yoshida, Tien Dat Pham, Masayuki Motoya, Shingo Takano, Ryo Shimizu, Kouichi Akahane, Ken-ichi Kitayama

Author Affiliations +

Proceedings Volume PC12894, Next-Generation Optical Communication: Components, Sub-Systems, and Systems XIII; PC1289402 (2024) https://doi.org/10.1117/12.2692260
Event: SPIE OPTO, 2024, San Francisco, California, United States

Abstract

Future short-reach optical fiber communication links for datacenter and optical access applications would require not only high data rate but also low power/complexity. In this work, by leveraging a home-designed LiNbO3 intensity modulator with high slope-efficiency, we experimentally investigate a low-complexity/power optical pulse amplitude modulation (PAM) link with 300Gb/s data rate excluding FEC overhead and the following detailed merits: (1) at the transmitter side, no digital signal processing or a high-resolution wideband DAC is required, while only CMOS-class driving voltages less than 1 volt is needed; (2) at the receiver side, no optical or electrical amplifier is needed. It is found that for C-band 600m transmission, a symbol-spaced decision-feedback equalizer (DFE) with 91 feedforward taps and 1 feedback taps is sufficient to achieve a BER lower than the threshold of a low-power practical FEC. With these features, we expect that the overall system has low power consumption. A bitrate-distance product of >180Gb/s*km in C-band is achieved experimentally.

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Paikun Zhu, Yuya Yamaguchi, Yuki Yoshida, Tien Dat Pham, Masayuki Motoya, Shingo Takano, Ryo Shimizu, Kouichi Akahane, and Ken-ichi Kitayama "Experimental investigation of DSP complexity of low-power beyond-300G IM-DD short-reach links", Proc. SPIE PC12894, Next-Generation Optical Communication: Components, Sub-Systems, and Systems XIII, PC1289402 (9 March 2024); https://doi.org/10.1117/12.2692260

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KEYWORDS

Digital signal processing

Forward error correction

Radio optics

Receivers

Transmitters

Modulation

Optical transmission

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