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. 19, 1998
Filed:
Mar. 13, 1997
Jay T Lofthouse-Zeis, San Ramon, CA (US);
John K Johnson, Sunnyvale, CA (US);
Coherent, Inc., Santa Clara, CA (US);
Abstract
Laser diode circuitry that controls the laser diode temperature as a function of laser diode current. Changes in the spectral output of the laser diode directly caused by adjustments to the operating current of the laser diode are offset by corresponding changes in the diode temperature. Diode temperature regulation circuitry automatically changes the diode temperature by monitoring the diode operating current. Alternately, when the diode current is adjusted to intentionally shift the spectral output of the diode, for example to maintain a frequency match to an external cavity resonance, the temperature regulation circuitry automatically changes the diode temperature to induce an additional spectral shift in the same direction, thereby inducing a current adjustment in the opposite direction that prevents large excursions in the amplitude of the operating current of the diode.