Patent ID: 7411986
Filing Date: 2008-08-12
Classification: H01S

Abstract:
1. A laser driver comprising: a first PNP transistor current source coupled to a first inductor, the first inductor coupled to a first side of a laser diode; a second PNP transistor current source coupled to a second inductor, the second inductor coupled to a second side of the laser diode; a first switch coupled to the first inductor; a second switch coupled to the second inductor; a control signal source that controls the first switch and the second switch according to a data signal such that the first switch is open when the second switch is closed and such that the first switch is closed when the second switch is open; and a current sink coupled to the first side of the laser diode when the first switch is closed and to the second side of the laser diode when the second switch is closed, wherein the first PNP transistor current source and the first inductor and the second PNP transistor current source and the second inductor and the current sink provide: