LASER-DIODE INTEGRATED WITH A LOW RADIATION LOSS THICKNESS-TAPERED BEAM EXPANDER FOR HIGHLY EFFICIENT FIBER COUPLING

Authors
TAKAHASHI M AOKI M SATO H OHTOSHI T TSUJI S
Citation
M. Takahashi et al., LASER-DIODE INTEGRATED WITH A LOW RADIATION LOSS THICKNESS-TAPERED BEAM EXPANDER FOR HIGHLY EFFICIENT FIBER COUPLING, Optical review, 3(6B), 1996, pp. 484-486
Citations number
12
Categorie Soggetti
Optics
Journal title
Optical review → ACNP
ISSN journal
13406000
Volume
3
Issue
6B
Year of publication
1996
Pages
484 - 486
Database
ISI
SICI code
1340-6000(1996)3:6B<484:LIWALR>2.0.ZU;2-0
Abstract
The optimal structure of a laser diode monolithically integrated with a thickness-tapered beam expander waveguide is demonstrated by analyzi ng the relationship between fiber coupling efficiencies and radiation losses. It is also found that mode conversion loss is lowered in a rid ge waveguide structure than in a buried hetero structure under equival ent fiber coupling. A fabricated ridge waveguide device based on this design shows threshold current as low as 16 mA and narrow beam diverge nces of 13 degrees and 12 degrees.