Patent ID: 6496526
Filing Date: 2002-12-17
Classification: H01S

Abstract:
A laser driver circuit comprising:first and second current generators for producing an amount of current equal to that required to drive a laser diode at its ON current, a current mirror comprising a first and second sections, the first current generator is electrically connected to the first section of the current mirror, the second current generator is electrically connected to the second section of the current mirror, a switch for opening or closing a connection between the first current generator and the first section of the current mirror, when the switch closes the connection between the first current generator and the first section of the current mirror, current from the first current generator is conducted to the first section of the current mirror wherein the second section of the current mirror conducts an equal current from the second current generator to ground with the remainder of the current from the second current generator is conducted to the laser diode, when the switch opens the connection between the first current generator and the first section of the current mirror, current from the first current generator is conducted to ground wherein the current from the second current generator is conducted to the laser diode, a control means for conducting a bias amount of current from the first current generator when the switch is closed, and a laser diode is electrically connected in series with the second current generator and is electrically connected in parallel with the second section of the current mirror.