Title :
Quasi planar spot-size transformer for efficient coupling between a cleaved fibre and an InP/InGaAsP rib waveguide
Author :
Ghirardi, F. ; Mersali, B. ; Brandon, J. ; Herve-Gruyer, G. ; Carenco, A.
Author_Institution :
Lab. de Bagneux, CNET, Bagneux, France
fDate :
4/1/1994 12:00:00 AM
Abstract :
A spot-size transformer structure is proposed for InP/InGaAsP double-heterostructure (DH) rib waveguide. Vertical expansion of a factor of 7 is achieved with 3 dB internal loss. Coupling from standard cleaved fibre (11 μm diameter mode) to a DH rib waveguide (5.8×0.8 μm large mode), is achieved with 4.5 dB polarisation independent loss. Coupling tolerances are highly relaxed. The fabrication method uses a thin cladding layer which ends up to a quasi-planar structure suitable with further integration process.
Keywords :
III-V semiconductors; gallium arsenide; indium compounds; integrated optics; optical couplers; optical fibres; optical losses; optical waveguides; 11 mum; 3 dB; 4.5 dB; InP-InGaAsP; InP/InGaAsP rib waveguide; cleaved fibre; coupling tolerances; double-heterostructure; efficient coupling; fabrication method; fibre coupling; internal loss; polarisation independent loss; quasi planar spot-size transformer; quasi-planar structure; thin cladding layer; Coupling circuits; DH-HEMTs; Indium phosphide; Optical fiber communication; Optical fiber devices; Optical fiber losses; Optical fiber polarization; Optical waveguides; Planar waveguides; Shape;
Journal_Title :
Photonics Technology Letters, IEEE
