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Finite-difference time-domain analysis of laser diodes integrated with tapered beam-expanders

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2 Author(s)
Takahashi, M. ; Central Res. Lab., Hitachi Ltd., Tokyo, Japan ; Ohtoshi, T.

Waveguide properties of laser diodes integrated with horizontally tapered beam-expanders are analyzed by the finite-difference time-domain method. The taper length dependence of the radiation loss and fiber-coupling efficiency are clarified. Lower loss and higher fiber-coupling efficiency are achieved in the exponentially tapered beam-expander compared with a linearly tapered one having an equivalent length.

Published in:

Photonics Technology Letters, IEEE  (Volume:11 ,  Issue: 5 )