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  

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

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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.