Ultra-compact 100 GbE transmitter optical sub-assembly for 40-km SMF transmission

Shigeru Kanazawa*, Takeshi Fujisawa, Nobuhiro Nunoya, Akira Ohki, Kiyoto Takahata, Hiroaki Sanjoh, Ryuzo Iga, Hiroyuki Ishii

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

49 Citations (Scopus)


The first ultra-compact transmitter optical sub-assembly (TOSA) has been developed for the metro-area 100 Gbit/s Ethernet (100 GbE) system. Four DFB lasers integrated with electro-absorption modulators (EADFB lasers) operated at 25.8 Gbit/s and an optical multiplexer are monolithically integrated on one chip. The chip was assembled in the compact TOSA using a three-dimensional (3D) RF circuit board supported by a spacer. The new structure provides compact and high-density interconnection with low crosstalk between RF signal lines. The TOSA is very small at just 8.0 mm × 35 mm × 6.5 mm including the receptacle and the flexible printed circuit (FPC) and could be installed in next-generation small form 100 GbE transceivers. In addition, an error-free transmission is demonstrated through 40 km of single-mode fiber at 100 Gbit/s with a modulation voltage of 2 V.

Original languageEnglish
Article number6302159
Pages (from-to)602-608
Number of pages7
JournalJournal of Lightwave Technology
Issue number4
Publication statusPublished - 2013
Externally publishedYes


  • 100 Gigabit ethernet
  • Distributed feedback laser
  • EADFB laser array
  • InGaAlAs
  • TOSA
  • electro-absorption modulator
  • photonic integrated circuits

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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