Planar optical waveguide device

Optical waveguides – Planar optical waveguide

Reexamination Certificate

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C385S131000

Reexamination Certificate

active

06847772

ABSTRACT:
A planar optical waveguide device including a substrate having a first coefficient of thermal expansion; a lower cladding layer formed on the substrate, the lower cladding layer having a second coefficient of thermal expansion smaller than the first coefficient of thermal expansion; a core formed on the lower cladding layer; an upper cladding layer formed on the lower cladding layer so as to cover the core, the upper cladding layer having the second coefficient of thermal expansion; and a plurality of grooves formed in the upper and lower cladding layers on the opposite sides of the core so as to extend along the core. The planar optical waveguide device further includes a contraction material filling each groove and fixed to the upper and lower cladding layers. The contraction material may be provided by a thermosetting resin.

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