Laser Diode Integrated with a Low Radiation Loss Thickness-Tapered Beam Expander for Highly Efficient Fiber Coupling

Makoto TAKAHASHI; Masahiro AOKI; Hiroshi SATO; Tsukuru OHTOSHI; Shinji TSUJI

doi:10.1007/BF02932054

Makoto TAKAHASHI, Masahiro AOKI, Hiroshi SATO, Tsukuru OHTOSHI, Shinji TSUJI

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Keywords: beam expander, optical coupling efficiency, radiation loss, ridge waveguide structure, buried hetero structure, beam propagation method, shadow-masked growth, selective area growth

JOURNAL FREE ACCESS

1996 Volume 3 Issue 6B Pages 484-486

DOI https://doi.org/10.1007/BF02932054

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Abstract

The optimal structure of a laser diode monolithically integrated with a thickness-tapered beam expander waveguide is demonstrated by analyzing the relationship between fiber coupling efficiencies and radiation losses. It is also found that mode conversion loss is lowered in a ridge waveguide structure than in a buried hetero structure under equivalent fiber coupling. A fabricated ridge waveguide device based on this design shows threshold current as low as 16 mA and narrow beam divergences of 13and 12

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