Driver for supplying modulated current to a laser

摘要

A driver device for a laser includes a control device configured to generate a control current, an NPN differential amplifier connected to the control device and configured to superimpose a modulation current onto the control current to generate a combined current, and a laser activation switch coupled to the output of the NPN differential amplifier, the laser activation switch operating the laser utilizing the combined current. Also described herein is a communication system including a driver device.

主权项

1. A driver device for a laser, said driver device comprising:
a control device configured to generate a control current; an NPN differential amplifier connected in series to the control device and configured to receive the control current generated by the control device, the NPN differential amplifier configured to superimpose a modulation current onto the control current to generate a combined current, wherein the control device is coupled between the differential amplifier and a power supply; an NPN laser activation switch comprising an NPN transistor including a base coupled to the output of the NPN differential amplifier and configured to receive the combined current, wherein the NPN differential amplifier is interposed between the control device and the NPN laser activation switch, the NPN laser activation switch configured to operate the laser based on the combined current; and a resistor coupled between the power supply and the NPN laser activation switch; wherein the control device is configured to compare a voltage across the resistor to a reference voltage and apply a bias voltage to the differential amplifier based on the comparison.