Graded index waveguide

Details Graded index waveguide Graded index waveguide

G - Physics

02

B

G02B 6/00 (2006.01) G02B 6/10 (2006.01) G02B 6/122 (2006.01) G02B 6/13 (2006.01) G02B 6/132 (2006.01) G02B 6/12 (2006.01)

Patent

CA 2415700

A planar waveguide that has a graded index layer at the core/cladding interface to reduce scattering losses due to core/classing interfave roughness. The refractive index at the core/cladding interface is changed from that of the core to that of cladding gradually by having a graded index layer. The graded index layer reduces the scattering of light traveling in the waveguide by reducing the effect of the roughness at the abrupt interface between the core and the cladding. Using a proper design, the graded index layer also minimizes the modal and polarization dispersion of the optical mode traveling in the waveguide.

Cette invention concerne un guide d'onde planaire comportant une couche à gradient d'indice à l'interface noyau/gaine dans le but de réduire les pertes par diffusion dues à la rugosité de cette interface. Au niveau de l'interface noyau/gaine, l'indice de réfraction passe progressivement de celui du noyau à celui de la gaine par suite de la présence d'une couche à gradient d'indice. Cette couche à gradient d'indice réduit la diffusion de la lumière dans le guide d'onde en atténuant l'effet de la rugosité au niveau de l'interface abrupte entre le noyau et la gaine. Correctement conçue, la couche à gradient d'indice permet également de diminuer la dispersion modale et de polarisation du mode optique qui se déplace dans le guide d'onde.

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