Numerical Analysis of Beam-Expanders Integrated with Laser Diodes

Makoto TAKAHASHI  Tsukuru OHTOSHI  Masahiro AOKI  Hiroshi SATO  Shinji TSUJI  Kazuhisa UOMI  Ken NAONO  

IEICE TRANSACTIONS on Electronics   Vol.E83-C    No.6    pp.845-854
Publication Date: 2000/06/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Advanced Optical Devices for Next Generation High-Speed Communication Systems and Photonic Networks)
Category: Semiconductor Lasers
optical waveguide,  beam-expander,  laser diode,  BPM,  FD-TD,  

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Waveguide characteristics of beam-expanders integrated with laser diodes were numerically analyzed by the beam propagation method (BPM) or the finite-difference time-domain (FD-TD) method. It was demonstrated that the vertically and horizontally hybrid tapered structure or an optimized refractive index in the cladding layer improve the trade-off relationship between fiber coupling efficiency and lasing characteristics. It was also demonstrated that exponentially tapering stripe width can reduce device length without sacrificing device properties.