Over-67-GHz-bandwidth Membrane InGaAlAs Electro-absorption Modulator Integrated with DFB Laser on Si Platform

Tatsurou Hiraki, Takuma Aihara, Yoshiho Maeda, Takuro Fujii, Tomonari Sato, Tai Tsuchizawa, Kiyoto Takahata, Takaaki Kakitsuka, Shinji Matsuo

Research output: Contribution to journalArticlepeer-review


We fabricate a membrane InGaAlAs electro-absorption modulator (EAM) integrated with a distributed feedback (DFB) laser combining direct wafer bonding and epitaxial regrowth of InP-based layers on a silicon-on-insulator wafer. Heterogeneous integration of an InP-based multiple-quantum-well (MQW) layer into the Si photonics simplifies the integration of the O-band EAMs and laser diodes (LDs). EAMs and LDs can be fabricated using the same MQW layer because of the wide operating range and the direct bandgap of the MQWs. A compact and high-speed lumped-electrode EAM can be made because the membrane lateral p-i-n diode structure has low capacitance and a large optical confinement factor. The effective-refractive-index matching between the membrane InP and Si layers enables the DFB laser to be fabricated with a low-loss supermode waveguide whose MQW core was optically coupled to the Si core. The fabricated 100-μm-long membrane EAM has a high modulation efficiency of about 3 dB/V at 1260 nm and E-O bandwidth of over 67 GHz even without a 50-ohm termination. The EAM-integrated DFB laser has a fiber coupled output power of about -2 dBm and clear eye openings with an extinction ratio of 3.8 and 3.2 dB for 100- and 112-Gbit/s non-return-to-zero signals, respectively.

Original languageEnglish
Pages (from-to)1-7
Number of pages7
JournalJournal of Lightwave Technology
Publication statusAccepted/In press - 2022


  • Electrooptic modulators
  • III-V semiconductor materials
  • Indium phosphide
  • Optical device fabrication
  • Optical waveguides
  • Optoelectronic devices
  • Quantum well devices
  • Silicon
  • Silicon photonics
  • Waveguide lasers

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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