Patent ID: 6240233
Filing Date: 2001-05-29
Classification: G02B

Abstract:
An integrated optical field width transformer for connecting an optical fiber to an optical chip, comprising:a substrate;a plurality of buffer layers stacked on the substrate;a plurality of waveguide layers for separating the buffer layers from each other;means disposed at a predetermined angle relative to the substrate and forming a first interface for connecting an optical fiber to the transformer;means disposed substantially opposite to the first interface and at a predetermined angle relative to the substrate and forming a second interface for connecting an optical chip to the transformer;a substantially unclad rib including a waveguide layer disposed on the upper buffer layer extending between the first and second interfaces and provided with a first section tapering from a first thickness to a second thickness, the rib having a second section extending at a substantially constant height and width from one of the first and second interfaces to the first section across the buffer layer, the buffer layer on either side of the second section of the rib being wider than the rib and being exposed between the first section and the one of the first and second interfaces.