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
Kenji KISHI
Yoshihisa SAKAI
Hiromi OOHASHI
Masashi NAKAO

Publication
IEICE TRANSACTIONS on Electronics   Vol.E80-C    No.1    pp.30-40
Publication Date: 1997/01/25
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Devices, Packaging Technology, and Subsystems for the Optical Access Network)
Category: 
Keyword: 
multi media,  low cost,  spot-size converted lasers,  two-inch substrate,  

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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 waveguide, 2) one with a laterally tapered waveguide, and 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 fiber, threshold current, output power, and 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 test, the 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.