Spot-size converter integrated laser diodes (ss-lds)

Yoshio Itaya, Yuichi Tohmori, Hiroshi Okamoto, Osamu Mitomi, Masato Wada, Kenji Kawano, Hideki Fukano, Kiyoyuki Yokoyama, Yasumasa Suzaki, Minoru Okamoto, Yasuhiro Kondo, Isamu Kotaka, Mitsuo Yamamoto, Masaki Kohtoku, Yoshiaki Kadota, Masashi Nakao

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)


SUMMARY We studied three types of lasers emitting narrow beam divergence of output light: 1) a spot-size converter integrated laser diodes (SS-LDs) with a vertically tapered waveguide2) one with a laterally tapered waveguideand 3) one consisting of a small cross section of active region. We compared them with regard to their performance in coupling efficiency to a cleaved single mode fiberthreshold currentoutput powerand reliability. Both the spot-size converted integrated lasers with vertically and laterally tapered waveguide repeatedly provided low threshold currents of as low as 6 mA and low coupling loss to the fiber of 1. 2 to 2. 5 dB in two inch wafer processes. As a result of the aging testthe SS-lasers were predicted to have the same degradation rate as a conventional buried heterostructure laser. The laser having a small cross section of active layer also has low coupling loss and high efficiency up to 85°C. :.

Original languageEnglish
Pages (from-to)30-37
Number of pages8
JournalIEICE Transactions on Electronics
Issue number1
Publication statusPublished - Jan 1 1997
Externally publishedYes


  • Low cost
  • Multi-media
  • Spot-size converted lasers
  • Two-inch substrate

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering


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