Abstract: Methods and systems are described for controlling output of a fuel cell that generates electrical power for an electric machine that propels a vehicle. In one example, a driver demand power reduction is anticipated and output of the fuel cell is adjusted before the driver demand power is reduced so that a greater amount of electric charge may be stored in an electric energy storage device.

Abstract: A high repetition rate injection laser modulator wherein a DC bias voltage is applied across a serially connected forwardly-poled-injection laser and carrier-injected avalanche device. The carrier-injected avalanche device generates a current pulse in response to additional carriers injected into the device by a trigger pulse applied across the control junction of the avalanche device. An offset bias is provided across the control junction to remove built-up charges at the junction interface to provide for high repetition rate operation. The current pulse is of sufficient magnitude to effect pumping of the injection laser, the injection laser thus emitting a corresponding pulse of coherent light.

Abstract: A carrier-injected avalanche device series connected to a forwardly-poled injection laser generates a current pulse, which may be as short as one nanosecond, through the injection laser only when both a direct current bias voltage is applied across this series connection from a charge supply and carriers have been injected into the device in response to the leading edge of a modulation trigger pulse. This current pulse through the injection laser is of sufficient magnitude to effect pumping thereof, so that the injection laser emits a corresponding pulse of coherent light, which may also be as short as one nanosecond.