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. 14, 2002
Filed:
Jun. 11, 2001
John J. Stronczer, Mattawan, MI (US);
Applied Micro Circuits Corporation, San Diego, CA (US);
Abstract
High-speed driver circuits interface with and enhance the performance of vertical-cavity surface-emitting laser (VCSEL) diodes used within fiber optic communication systems, according to embodiments of the invention. A reference diode is formed from a first transistor, and a first current mirror sets a modulation current through the reference diode for driving a light-emitting device. A second current mirror sets a reference biasing current to maintain a constant bias of the reference diode. A first capacitor, charged by a differential amplifier and coupled to the reference diode, supplies complementary charge to the reference diode during differential input voltage transitions. Components of the driver circuit provide asymmetrical operation of the laser, allowing rapid light-emitting-device turn-on and turn-off.