Efficiency improved driver for laser diode in optical communication

A circuit for providing a headroom voltage for a laser driver driving a laser diode, the laser diode configured to provide signals to an optical communications device, comprising:

• a feedback loop circuit connected between the output of the laser diode and an input of the laser driver, the feedback loop configured to generate a voltage Vout based on the headroom voltage and to apply the voltage Vout to the input of the laser diode, wherein the feedback loop circuit is configured to generate Vout to compensate for high frequency reflections in the laser driver to maintain an optimized headroom voltage for the laser driver.

A method of controlling a headroom voltage of a laser driver, the laser diode being driven by a laser driver, a headroom control circuit connected to receive the headroom voltage of the laser driver, a DC-DC converter connected to receive an output out the headroom control circuit and to output a voltage Vout to an input of the laser diode, the method comprising:

• generating a controlled voltage based on the headroom voltage with the headroom control circuit;
• and
• generating a voltage Vout based on the controlled voltage with the DC-DC converter, and applying the voltage Vout as an input to the laser diode, wherein the headroom control circuit modifies the voltage Vout to compensate for high frequency reflections in the laser driver to maintain an optimized headroom voltage for the laser driver.