Patent ID: 7457336
Filing Date: 2008-11-25
Classification: H01S

Abstract:
1. A laser diode drive circuit comprising: a first transistor having a collector, a base, and an emitter, the collector being arranged for connection to an anode of a laser diode; a second transistor having a collector, a base, and an emitter the collector being arranged for connection to a cathode of the laser diode; a constant current circuit connected between a ground point and the emitters of said first and second transistors; a first high-pass filter connected between the base and the collector of said first transistor; a second high-pass filter connected between the base and the collector of said second transistor; and first and second variable resistances, the first and second variable resistances being respectively provided between the emitters of said first and second transistors, respectively, and said constant current circuit, wherein resistance of each of the first and second variable resistance can be externally adjusted.