Kotura, Inc.

Bookham Technology Limited

Andrew Alan House

George Frederick Hopper

Adrian Petru Vonsovici

Andrew Peter Knights

Dominic Joseph Brady

Ian Edward Day

The sensor includes an optical waveguide defined in a light-transmitting medium. The waveguide includes a sensing portion and an non-sensing portion. The light-transmitting medium included in the sensing portion has defects that provide the light-transmitting medium with a deep band gap level between a valence band of the light-transmitting medium and a conduction band of the light-transmitting medium. The deep band gap level is configured such that the waveguide guiding light signals through the light-transmitting medium in the sensing portion causes free carriers to be generated in the light-transmitting medium. A detector is configured to detect the free carriers in the sensing region of the waveguide.

In-line light sensor

An integrated optical waveguide () having an in-line light sensor () integrally formed therewith for tapping off a small proportion of the signal transmitted along the waveguide (). A first part (A) of the waveguide leads to a photodiode portion () and a second part (B) of the waveguide leads away from the photodiode portion (), the photodiode portion () comprising one or more regions () of light absorbing material within the waveguide () arranged to absorb a minor proportion of light transmitted along the waveguide () and thereby to generate free charge carriers within the waveguide (). Deep band gap levels () are introduced into photodiode portion by ion implantation to enable it to absorb selected wavelengths. The free charge carriers are detected by a p-i-n diode formed across the waveguide (). Wavelength selective reflectors () may be provided either side of the photodiode portion () so light passes repeatedly through the photodiode portion ().

An isolation device that can be used for providing optical and electrical isolation between areas of an integrated chip. The isolation device includes three doped elongate regions which form diodes which can be connected in series. The isolation device can be used in optical devices or optical attenuators.

Isolation device

An optical phase modulator comprises a semiconductor rib wave guide having P and N doped regions forming a PN junction along the path of the rib with terminals for applying a reverse bias to the junction to extend a carrier depletion zone to alter the refractive index, the PN junction is offset from the central axis of the rib but on application of the reverse bias the depletion zone extends over a central axis of the waveguide.

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Headington, United Kingdom

Andrew Alan House