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:
Dec. 04, 1979
Filed:
Dec. 05, 1977
Applicant:
Inventors:
Richard W Dixon, Bernardsville, NJ (US);
Joseph F Svacek, III, Jamesburg, NJ (US);
Assignee:
Bell Telephone Laboratories, Incorporated, Murray Hill, NJ (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01S / ;
U.S. Cl.
CPC ...
331 / ; 307312 ;
Abstract
The apparent differential output power or quantum efficiency of a semiconductor laser, such as a double heterostructure laser diode, is reduced by means of a circuit which shunts the laser and includes a threshold device. The I-V characteristic of the shunt circuit intersects that of the laser at V.sub.x such that at voltages below V.sub.x the current through the laser exceeds that through the shunt, and conversely above V.sub.x. Specific embodiments of the shunt circuit include a resistor in series with either a zener diode or one or more forward-biased conventional diodes.