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Impact Statement:Superconducting single flux quantum (SFQ) processor and Cryogenic CMOS controller for scalable Quantum Computing are pivotal technological advancements for cryogenic comp...Show More
Abstract:
Cryogenic CMOS controller and Superconducting processors for scalable Quantum Computing are pivotal technological advancements for cryogenic computing. However, energy-ef...Show MoreMetadata
Impact Statement:
Superconducting single flux quantum (SFQ) processor and Cryogenic CMOS controller for scalable Quantum Computing are pivotal technological advancements for cryogenic computing. However, energy-efficient data link from cryogenic operations to room temperature applications remains to be developed. In this work, we report on the development of high-speed Cryogenic VCSEL with gain-cavity alignment around 40 K and operated from 2.8 K to 300 K. The 6 um aperture Cryo-VCSELs at 2.8 K and 40 K exhibits the record Laser P out > 13 mW, high L-I linearity up to I/I th > 125 and small-signal bandwidth f -3dB > 50 GHz. Furthermore, these devices demonstrate high-speed optical data link of NRZ = 64 Gb/s with TDEC < 3 dB and 112 Gb/s PAM-4 with TDECQ = 2.56 dB at 7 mA operating current. In addition, we demonstrated the first laser small-signal bandwidth characterization down to 2.8 K. While the devices and the testing setup still need further optimization in the future, we believe this work proves oxide-VCSELs as excellent ultralow power microcavity laser optical transmitters near 4 K, thus paving the way for high-speed optical data communication in next-generation cryogenic computing technologies.
Abstract:
Cryogenic CMOS controller and Superconducting processors for scalable Quantum Computing are pivotal technological advancements for cryogenic computing. However, energy-efficient data link from cryogenic operations to room temperature applications remains to be developed. In this work, we report on the development of high-speed Cryogenic VCSEL with material design of gain-cavity alignment around 40 K and oxide-aperture of 6~\mu m operated from 2.8 K to 300 K. In addition, we have established on-wafer cryogenic microwave electrical and optical probing system for performing accurate measurement calibration. Cryo-VCSELs at 2.8 K and 40 K with the record Laser Pout >13 mW, high L-I linearity up to I/I _{\mathrm {th}} \gt 125 and bandwidth f _{\mathrm {-3dB}} \gt 50 GHz are measured. Furthermore, these devices demonstrate high-speed optical data link of NRZ =64 Gb/s with TDEC <3 dB and 112 Gb/s PAM-4 with TDECQ =2.56 dB at 7 mA operating current.
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Published in: IEEE Journal of Quantum Electronics ( Volume: 60, Issue: 5, October 2024)