Modulators for vertical cavity surface emitting lasers

摘要

A drive circuitry that drives a number of vertical cavity surface emitting lasers having a common cathode. The drive circuitry includes a modulator and a dummy laser. The modulator controls the vertical cavity surface emitting lasers. A modulation and bias current is directed to one of the vertical cavity surface emitting lasers to turn on the laser. A modulation current is directed away from the vertical cavity surface emitting laser to turn off the laser.