Directly modulated membrane lasers with 108 GHz bandwidth on a high-thermal-conductivity silicon carbide substrate

Suguru Yamaoka*, Nikolaos Panteleimon Diamantopoulos, Hidetaka Nishi, Ryo Nakao, Takuro Fujii, Koji Takeda, Tatsurou Hiraki, Takuma Tsurugaya, Shigeru Kanazawa, Hiromasa Tanobe, Takaaki Kakitsuka, Tai Tsuchizawa, Fumio Koyama, Shinji Matsuo

*この研究の対応する著者

研究成果: Article査読

20 被引用数 (Scopus)

抄録

Increasing the modulation speed of semiconductor lasers has attracted much attention from the viewpoint of both physics and the applications of lasers. Here we propose a membrane distributed reflector laser on a low-refractive-index and high-thermal-conductivity silicon carbide substrate that overcomes the modulation bandwidth limit. The laser features a high modulation efficiency because of its large optical confinement in the active region and small differential gain reduction at a high injection current density. We achieve a 42 GHz relaxation oscillation frequency by using a laser with a 50-μm-long active region. The cavity, designed to have a short photon lifetime, suppresses the damping effect while keeping the threshold carrier density low, resulting in a 60 GHz intrinsic 3 dB bandwidth (f3dB). By employing the photon–photon resonance at 95 GHz due to optical feedback from an integrated output waveguide, we achieve an f3dB of 108 GHz and demonstrate 256 Gbit s−1 four-level pulse-amplitude modulations with a 475 fJ bit−1 energy cost of the direct-current electrical input.

本文言語English
ページ(範囲)28-35
ページ数8
ジャーナルNature Photonics
15
1
DOI
出版ステータスPublished - 2021 1

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 原子分子物理学および光学

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