Patents by Inventor Harold David DuBose

Harold David DuBose has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Apparatus for reducing amplitude modulation of laser diode output
    Patent number: 6292501
    Abstract: A laser diode system comprising a voltage source, an inductor connected to the output of the voltage source, an integrator circuit connected in series with the inductor, and a laser diode. The integrator circuit filters out noise from the voltage source, and includes a first resistor, an amplifier, a second resistor, and first and second capacitors. The second capacitor has one lead connected to the input lead of the inductors and the other lead attached to the input of the first resistor. The output lead of the first resistor is connected to the negative input lead of the amplifier, and to the input lead of the first capacitor. The positive input lead of amplifier OP is connected to the output of the inductor (and the anode of the laser diode). The outputs of amplifier and the first capacitor are connected to the input of the second resistor, which has an output connected to the anode of the laser diode. The cathode of laser diode is tied to circuit common.
    Type: Grant
    Filed: September 8, 1999
    Date of Patent: September 18, 2001
    Assignee: Coherent, Inc.
    Inventor: Harold David DuBose