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:
Aug. 25, 2009
Filed:
Dec. 15, 2005
Xuewen Shu, Birmingham, GB;
Catherine Anne Sugden, Birmingham, GB;
Ian Bennion, Ravensthorpe, GB;
Aston University, Birmingham, West Midlands, GB;
Abstract
A Gires-Tournois etalon (GTE) () comprising an optical fiber () in which a primary chirped fiber Bragg grating (FBG) () is provided, an RF signal generator (), a piezoelectric transducer (), and a glass horn (), for coupling an acoustic wave (26) into the fiber (). The acoustic wave (26) causes a periodic compression within the fiber (), which induces a low frequency periodic refractive index modulation within the grating section () of the fiber (). This causes two side frequency components to be generated for each high-frequency component of the FBG (). Two secondary grating are thus excited, having the same spectral bandwidth as the FBG (), but a lower reflectivity and different central wavelengths. The free spectral range of the GTE () can be adjusted by varying the frequency of the acoustic wave (). The reflectivity of the excited secondary gratings can be adjusted by adjusting the amplitude of the acoustic wave ().