Driver circuits of the present invention provide current to drive laser
diodes. The output current of the driver circuit includes a data signal
and a low frequency tone signal. The low frequency tone signal is within
the bandwidth of a power control feedback loop. The tone signal introduces
low frequency noise into the output signal of the driver circuit. The low
frequency noise causes jitter at the zero crossing points of the driver
circuit output signal. A laser driver circuit of the present invention
provides a compensation current to a laser diode. The compensation current
is out of phase with the tone signal. The compensation current eliminates
the low frequency noise in the output signal of the laser driver circuit.
