Cryo-VCSELs Operated at 2.8 K and 40 K With Record Bandwidth, Power, and Linearity for Optical Data Links in Quantum Computing

Haonan Wu, Wenning Fu, Zetai Liu, Derek Chaw, Yulin He, Milton Feng

Research output: Contribution to journalArticlepeer-review

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 µm 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/Ith > 125 and bandwidth f−3dB > 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.

Original languageEnglish (US)
Article number2400310
JournalIEEE Journal of Quantum Electronics
Volume60
Issue number5
DOIs
StatePublished - 2024
Externally publishedYes

Keywords

  • Vertical-cavity surface-emitting lasers (VCSEL)
  • cryogenics
  • data transfer
  • high speed modulation
  • optical interconnects
  • quantum computing
  • superconducting circuits

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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