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. 10, 1988
Filed:
Nov. 07, 1986
Antonius J Nicia, Eindhoven, NL;
U.S. Philips Corporation, New York, NY (US);
Abstract
A device for driving a laser (2) includes a quiescent-current means (3) which supplies, under control of a negative feedback current (I.sub.D) from a photodetector (9), a quiescent current (I.sub.B) to the laser in order to stabilize the laser light output at a level corresponding to a logic one value of a digital input signal (D). A modulation device (10), which comprises a converter, is responsive to the digital input signal to supply a first drive current (i.sub.M1) to modulate the laser. The modulation device supplies a second drive current (i.sub.M2), complementary to the first drive current, to a compensation device (20) which, for a logic zero signal, applies a compensation current (I.sub.C) to the quiescent current means thereby to reduce the light level.