Patents by Inventor Lim Cheng Guan

Lim Cheng Guan 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).

  • Signal transmission line for an optical modulator
    Patent number: 6873449
    Abstract: An electro-absorptive-modulated laser (EAML) module includes a signal transmission line for transferring a high-frequency modulating signal from a signal source having an output impedance of 50 ? to an EA modulator in the EAML module. The signal transmission line includes a coplanar waveguide with ground plane (CPWG) having a characteristic impedance of 41.8 ?, a series resistor having a resistance of 5 ?, and a termination resistor of 50 to 150 ?. The characteristic impedance of CPWG is controlled by reducing the gap between the signal line and coplanar ground plates.
    Type: Grant
    Filed: September 5, 2003
    Date of Patent: March 29, 2005
    Assignee: The Furukawa Electric Co., Ltd.
    Inventors: Lim Cheng Guan, Sonomi Ishii