Optical links on silicon photonic chips using ultralow-power consumption photonic-crystal lasers

KOJI TAKEDA, TAKUMA TSURUGAYA, TAKURO FUJII, AKIHIKO SHINYA, YOSHIHO MAEDA, TAI TSUCHIZAWA, HIDETAKA NISHI, MASAYA NOTOMI, TAKAAKI KAKITSUKA, SHINJI MATSUO

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Ultrashort-distance optical interconnects are becoming increasingly important due to continuous improvements in servers and high-performance computers. As light sources in such interconnects, directly modulated semiconductor lasers with an ultrasmall active region are promising. In addition, using Si waveguides is important to provide low loss optical links with functions such as wavelength filtering and switching. In this paper, we demonstrate a wafer-scale heterogeneous integration of lambda-scale embedded active-region photonic-crystal (LEAP) lasers and Si waveguides, achieved through precise alignment. We numerically and experimentally demonstrated the coupling design between the LEAP lasers and Si waveguides; it is important to match propagation constants of Si waveguides and wavenumber of the optical cavity modes. The LEAP lasers exhibit an ultralow threshold current of 13.2-μA and 10-Gbit/s direct modulation. We also achieved the first data transmission using an optical link consisting of a LEAP laser, Si waveguide, and photodetector and obtained an averaged eye diagram at a bit rate of 10 Gbit/s with a bias current of 150 μA.

Original languageEnglish
Pages (from-to)26082-26092
Number of pages11
JournalOptics Express
Volume29
Issue number16
DOIs
Publication statusPublished - 2021 Aug 2

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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