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:
Feb. 24, 2004
Filed:
Nov. 15, 2001
James Thomas Theodoras, Plano, TX (US);
Alcatel, Paris, FR;
Abstract
The present invention comprises a dense wavelength division multiplexing system which uses an automatic level control feedback circuit or loop ( ) to maintain one of a plurality of selectable output power levels. In addition, to prevent the sidelobes of the individual channels from interfering with one another when power to the channel is increased, an optical bandpass filter ( ) is placed in the optical feedback path of the ALC loop ( ). Furthermore, if the frequency or wavelength drifts from the desired output wavelength, the output wavelength is tuned by cooling or heating the laser using a thermoelectric cooler ( ) which is part of a thermoelectric cooler loop ( ) that uses a calibration table to adjust for temperature/wavelength errors.