Title :
Design of fiber-matched uncladded rib waveguides on InP with polarization-independent mode matching loss of 1 dB
Author_Institution :
Heinrich-Hertz-Inst. fur Nachrichtentech. Berlin GmbH, Germany
Abstract :
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.
Keywords :
III-V semiconductors; finite difference methods; gallium arsenide; indium compounds; mode matching; optical couplers; optical design techniques; optical fibre couplers; optical fibre losses; rib waveguides; semiconductor heterojunctions; InGaAsP-InP; InP; channel waveguides; fiber-matched uncladded rib waveguides; guided mode; mode matching loss; polarization-independent coupling loss; polarization-independent mode matching loss; relaxed fabrication tolerances; spot size variation; taper structure; thin guiding layers; two-dimensional finite difference method; uncladded rib; Finite difference methods; Indium phosphide; Optical device fabrication; Optical fiber losses; Optical fiber polarization; Optical waveguide theory; Optical waveguides; Slabs; Tellurium; Waveguide theory;
Journal_Title :
Photonics Technology Letters, IEEE
