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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
Publication Date: 2000/06/25
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.