Patent ID: 7519301

Claim:
An apparatus, comprising: a silicon optical modulator; and an integrated circuit coupled to the silicon optical modulator, the integrated circuit having: a first emitter follower to drive a first data signal to the silicon optical modulator, the first data signal including a rising edge and a falling edge; a second emitter follower to drive a second data signal to the silicon optical modulator, the second data signal including a rising edge and a falling edge; a first current source coupled to the second emitter follower, the first content source having a first transistor coupled to a first capacitor, wherein the first capacitor is to differentiate the second data signal so that the first transistor turns on in response to the rising edge of the second data signal and turns off during the falling edge of the second data signal; and a second current source coupled to the first emitter follower, the second current source having a second transistor coupled to a second capacitor, wherein the second capacitor is to differentiate the first data signal so that the second transistor turns on in response to the rising edge of the first data signal and turns off during the falling edge of the first data signal.