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Design of fiber-matched uncladded rib waveguides on InP with polarization-independent mode matching loss of 1 dB

: Weinert, C.M.


IEEE Photonics Technology Letters 8 (1996), No.8, pp.1049-51
ISSN: 1041-1135
Journal Article
Fraunhofer HHI ()
finite difference methods; gallium arsenide; iii-v semiconductors; indium compounds; mode matching; optical couplers; optical design techniques; optical fibre couplers; optical fibre losses; rib waveguides; semiconductor heterojunctions; fiber-matched uncladded rib waveguides; inp; polarization-independent mode matching loss; uncladded rib; channel waveguides; InGaAsP-InP; polarization-independent coupling loss; spot size variation; guided mode; two-dimensional finite difference method; thin guiding layers; taper structure; relaxed fabrication tolerances; mode matching loss

A waveguide taper design for uncladded rib or channel waveguides on InGaAsP-InP with polarization-independent coupling loss to the fiber is proposed. The spot size variation of the guided mode along the taper is investigated numerically by a two-dimensional finite difference method. By introducing thin guiding layers below the waveguide it is shown that the taper structure can be designed to have relaxed fabrication tolerances and a mode matching loss to the fiber of 1 dB.