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Uncladded InGaAsP/InP rib waveguides with integrated thickness tapers for efficient fibre-chip butt coupling

 

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Electronics Letters 32 (1996), No.1, pp.36-38
ISSN: 0013-5194
English
Journal Article
Fraunhofer HHI ()
gallium arsenide; iii-v semiconductors; indium compounds; optical fibre couplers; optical losses; optical planar waveguides; rib waveguides; uncladded rib waveguides; integrated thickness tapers; fibre-chip butt coupling; waveguide core thickness; spot-size transformers; coupling loss; flat-end fibres; alignment tolerances; excess loss; 1 db; InGaAsP-InP

Abstract
The thickness of the waveguide core of uncladded InGaAsP/InP rib waveguides is tapered to fabricate new spot-size transformers without epitaxial regrowth or etching of deep grooves. The coupling loss for flat-end fibres is reduced by 7 dB at alignment tolerances of >+or-2.0 mu m for 1 dB excess loss.

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