Laser diode integrated with a low radiation loss thickness-tapered beam expander for highly efficient fiber coupling |
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Authors: | Makoto Takahashi Masahiro Aoki Hiroshi Sato Tsukuru Ohtoshi Shinji Tsuji |
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Institution: | 1. Central Research Laboratory, Hitachi Ltd., 1-280, Higashi-Koigakubo, Kokubunji, 185, Tokyo, Japan
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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 13° and 12°. |
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