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:
Oct. 09, 2001
Filed:
Jan. 11, 1999
Scott L. Broutin, Kutztown, PA (US);
James Kevin Plourde, Allentown, PA (US);
John William Stayt, Jr., Schnecksville, PA (US);
Agere Systems Optoelectronics Guardian Corp., Allentown, PA (US);
Abstract
A wavelength stabilized laser system includes a laser that produces a laser light. The laser light has an amplitude and a wavelength that vary with the laser temperature. A first detector provides a first signal representing the amplitude of the laser light. A filter has a gain that is a function of the wavelength of the laser light. The filter receives the laser light and outputs a filtered light having an amplitude that varies with the wavelength of the laser light. A second detector provides a second signal representing the amplitude of the filtered light. A transformer has a primary and a secondary. The primary is electrically coupled to the first and second detectors. The primary of the transformer includes a first coil connected to the first detector and a second coil connected to the second detector. The first and second coils of the primary are opposite in polarity from each other. Thus, the secondary has a voltage that is proportional to the difference between the voltages of the first and second detectors. A controller is coupled to the secondary. The controller controls the wavelength of the laser based on a voltage of the secondary of the transformer.