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:
Apr. 10, 2007
Filed:
Jul. 23, 2004
Richard M Jenkins, Malvern, GB;
Mark E Mcnie, Malvern, GB;
James Mcquillan, Malvern, GB;
Craig D Stacey, Malvern, GB;
Richard M Jenkins, Malvern, GB;
Mark E McNie, Malvern, GB;
James McQuillan, Malvern, GB;
Craig D Stacey, Malvern, GB;
Qinetiq Limited, London, GB;
Abstract
Optical circuits for optical amplifier input and output stages are described. The input stage circuit () comprises a first optical waveguide () for carrying a signal beam to be amplified, a second optical waveguide () for carrying a pump beam, a beam combining means () optically coupled to the first and second optical waveguides () for producing a combined signal/pump beam, and means for optically coupling the combined signal/pump beam into an amplifying optical fibre (). The output stage circuit () comprises a first output optical waveguide (), an optical fibre attachment means arranged to receive an amplifying optical fibre () and an optical fibre attachment means arranged to receive an output optical fibre () wherein light from the amplifying optical fibre () is optically coupled to the output optical fibre () via the first output optical waveguide (). The first and second optical waveguides () and the first output optical waveguide () are hollow core optical waveguides formed as channels in a substrate. A fibre amplifier, in particular an erbium doped fibre amplifier, comprising such optical circuits is also described.