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:
May. 01, 2001
Filed:
Jul. 02, 1998
Moshen Ashkeboussi, Alpharetta, GA (US);
Ryszard S. Ozarowski, Marietta, GA (US);
Scientific-Atlanta, Inc., Lawrenceville, GA (US);
Abstract
An optical transmitter (,) in a cable television system (,) includes an uncooled laser diode (,) and a thermal compensation circuit (FIG.,). The thermal compensation circuit includes a voltage controlled attenuator (,) located between the transmitter input (,), at which an electrical information signal is received, and the laser diode (,). The thermal compensation circuit also includes a thermistor (,) that is situated physically near the laser diode (,) and that is characterized by a resistance that varies with temperature. The thermistor (,) is coupled to a controller (,) for sensing thermistor resistance changes, which are indicative of changes in the laser diode temperature, and for selectively controlling the attenuator (,) to attenuate the level of the electrical information signal.