Compact Hybrid-Integrated 100-Gb/s TOSA Using EADFB Laser Array and AWG Multiplexer

Takaharu Ohyama, Yoshiyuki Doi, Wataru Kobayashi, Shigeru Kanazawa, Takuya Tanaka, Kiyoto Takahata, Atsushi Kanda, Takeshi Kurosaki, Tetsuichiro Ohno, Hiroaki Sanjoh, Toshikazu Hashimoto

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)


We have developed a compact hybrid-integrated four-lane × 25.8 Gb/s transmitter optical sub-assembly (TOSA) for a 100 Gb/s transceiver for 40-km transmission. The TOSA has a simple configuration in which a four-channel electroabsorption modulator integrated distributed feedback (EADFB) laser array is directly attached to the input waveguide end-faces of a silica-based arrayed waveguide grating (AWG) multiplexer. We integrated a lateral tapered spot-size converter for the EADFB laser to achieve a high optical butt coupling efficiency between the EADFB lasers array and the AWG multiplexer. We confirmed that the TOSA, which is 19.9 mm × 6 mm × 5.8 mm, achieved error-free operation for a 40-km transmission with a high average optical output power of over 0.3 dBm at an operating temperature of 55 °C.

Original languageEnglish
Article number7370759
Pages (from-to)802-805
Number of pages4
JournalIEEE Photonics Technology Letters
Issue number7
Publication statusPublished - 2016 Apr 1
Externally publishedYes


  • 100-Gbit/s Ethernet
  • AWG multiplexer
  • EADFB laser
  • TOSA
  • butt coupling
  • hybrid-integration
  • spot-size converter

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering


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