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Proceedings Paper

Photonic-crystal lasers on silicon for chip-scale optical interconnects
Author(s): Koji Takeda; Takuro Fujii; Akihiko Shinya; Eiichi Kuramochi; Masaya Notomi; Koichi Hasebe; Takaaki Kakitsuka; Shinji Matsuo
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Paper Abstract

Optical interconnects are expected to reduce the power consumption of ICT instruments. To realize chip-to-chip or chip-scale optical interconnects, it is essential to fabricate semiconductor lasers with a smaller energy cost. In this context, we are developing lambda-scale embedded active-region photonic-crystal (LEAP) lasers as light sources for chip-scale optical interconnects. We demonstrated the first continuous-wave (CW) operation of LEAP lasers in 2012 and reported a record low threshold current and energy cost of 4.8 μA and 4.4 fJ/bit at 10 Gbit/s in 2013. We have also integrated photonic crystal photodetectors on the same InP chip and demonstrated waveform transfer along 500-μm-long waveguides. Although LEAP lasers exhibit excellent performance, they have to be integrated on Si wafers for use as light sources for chip-scale optical interconnects. In this paper, we give a brief overview of our LEAP lasers on InP and report our recent progress in fabricating them on Si. We bonded the InP wafers with quantum-well gain layers directly on thermally oxidized Si wafers and performed all process steps on the Si wafer, including high-temperature regrowth. After this process modification, we again achieved CW operation and obtained a threshold current of 57 μA with a maximum output power of more than 3.5 μW at the output waveguides. An output light was successfully guided through 500 × 250-nm InP waveguides.

Paper Details

Date Published: 7 March 2016
PDF: 6 pages
Proc. SPIE 9767, Novel In-Plane Semiconductor Lasers XV, 976710 (7 March 2016); doi: 10.1117/12.2208312
Show Author Affiliations
Koji Takeda, NTT Corp. (Japan)
Takuro Fujii, NTT Corp. (Japan)
Akihiko Shinya, NTT Corp. (Japan)
Eiichi Kuramochi, NTT Corp. (Japan)
Masaya Notomi, NTT Corp. (Japan)
Koichi Hasebe, NTT Corp. (Japan)
Takaaki Kakitsuka, NTT Corp. (Japan)
Shinji Matsuo, NTT Corp. (Japan)

Published in SPIE Proceedings Vol. 9767:
Novel In-Plane Semiconductor Lasers XV
Alexey A. Belyanin; Peter M. Smowton, Editor(s)

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