One embodiment of a laser driver for high speed interconnections includes
a buffered level shifter to shift the input voltage level to an
appropriate level. In some embodiments the buffered level shifter may be
tuned to provide a desired level shift with impedance matched to the
driving load. Another embodiment converts a digital signal to a current
train of a bias mode to represent logical zero and of a modulation mode
to represent logical one, wherein one or both of the bias mode and
modulation mode may be adjusted, for example by a programmable control
circuit or by an adaptive control circuit. Some embodiments also provide
circuitry for reducing overshoot of the output signal.