Integrated multi-port multi-wavelength coherent optical source for beyond Tb/s optical links

Ali Pirmoradi, Jizhao Zang, Kaisarbek Omirzakhov, Zhehao Yu, Yan Jin, Scott B. Papp and Firooz Aflatouni ()
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Ali Pirmoradi: University of Pennsylvania
Jizhao Zang: National Institute of Standards and Technology (NIST)
Kaisarbek Omirzakhov: University of Pennsylvania
Zhehao Yu: University of Pennsylvania
Yan Jin: National Institute of Standards and Technology (NIST)
Scott B. Papp: National Institute of Standards and Technology (NIST)
Firooz Aflatouni: University of Pennsylvania

Nature Communications, 2025, vol. 16, issue 1, 1-13

Abstract: Abstract Microcomb-based sources formed by placing an integrated demultiplexer with an ultra-low power consumption after an efficient optical frequency comb play a key role in many large-scale optical links for data centers and AI systems. Here, we demonstrate a multi-wavelength multi-port source based on a Kerr microcomb followed by a monolithically-integrated demultiplexer, which autonomously locks to and tracks the comb lines. Mach-Zehnder interferometer- and ring resonator-based wavelength demultiplexers, implemented using capacitive optical phase shifters with a zero static power consumption, and a soliton microcomb, with a 200 GHz mode-spacing and 53% efficiency, are implemented. Using a single control unit for the sequential control of all phase shifters, a total demultiplexer power consumption of 2.4 mW is achieved, which corresponds to a record demultiplexer energy consumption of 10fJ/b and 2.5fJ/b for an 8-channel and 32-channel systems at a data-rate of 32 Gb/s/channel, respectively, significantly improving the demultiplexer energy efficiency compared to the thermally-tuned state-of-the-art systems.

Date: 2025
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DOI: 10.1038/s41467-025-61288-x

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