Patent ID: 7391797

Claim:
An integrated circuit for controlling a laser diode, having: a signal input for receiving a data signal; a signal output for connection to the laser diode; a modulator for modulation the data signal, wherein the modulator has a first node coupled to the signal input node such that the data signal is modulated by the modulator after being received by the signal input node; a current infeed connected to the signal output node and serving for the supply of a bias current; a coupling capacitor having a first terminal coupled to a second node of the modulator and a second terminal coupled to the signal output node, for forming a high-pass filter with the differential resistor of the laser diode connected to the signal output node, and an active compensation circuit having: a low-pass filter connected to the output of the modulator, a voltage inverter connected to the low-pass filter and serving for inverting the voltage generated by the low-pass filter in accordance with the low-pass filter transfer function; a voltage follower connected to the output of the voltage inverter; and a converter between the output of the voltage follower and the signal output, for generating a current which is inversely proportional to the low-pass filter output voltage.