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. 22, 1978
Filed:
Dec. 10, 1976
Charles Arthur Brackett, Summit, NJ (US);
Richard Grant Smith, Basking Ridge, NJ (US);
Bell Telephone Laboratories, Incorporated, Murray Hill, NJ (US);
Abstract
Described is a stabilization circuit for reducing the sensitivity of a junction laser to variations in the amplitude of drive current pulses. The circuit comprises a transistor connected in common emitter configuration, a junction laser connected between the collector and emitter, a photodetector connected between a voltage node and the emitter, a nonlinear element, such as a switching diode, connected between the node and the base, means for coupling a portion of the laser radiation to the photodetector, and means for coupling an input signal (e.g., current pulses) between the base and emitter. In one embodiment the photodetector is an avalanche photodiode to provide gain and the nonlinear element is a switching diode. In another embodiment the nonlinear element is a switching transistor to provide gain and the photodetector is a PIN photodiode.