The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 10, 2008
Filed:
Dec. 27, 2002
Andrew Peter Knights, Oxon, GB;
Adrian Petru Vonsovici, London, GB;
Dominic Joseph Brady, Headington, GB;
Andrew Alan House, Headington, GB;
George Frederick Hopper, Maidenhead, GB;
Andrew Peter Knights, Oxon, GB;
Adrian Petru Vonsovici, London, GB;
Dominic Joseph Brady, Headington, GB;
Andrew Alan House, Headington, GB;
George Frederick Hopper, Maidenhead, GB;
Kotura, Inc., Monterey Park, CA (US);
Abstract
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 ().