Patents by Inventor Ping-Chiek Koh

Ping-Chiek Koh 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).

  • Integrated on-chip inductors and capacitors for improved performance of an optical modulator
    Patent number: 7899277
    Abstract: An optical modulator for fiberoptic telecommunications is disclosed in which the optical signal velocity in the modulator waveguide and the electrical signal velocity in the traveling wave signal electrode are purposely mismatched by a factor of up to about 4. On-chip integrated inductors and capacitors are implemented to achieve the velocity mismatch. Improved electro-optic characteristics, such as return loss and sharper cut-off bandwidth are obtained.
    Type: Grant
    Filed: May 28, 2009
    Date of Patent: March 1, 2011
    Assignee: JDS Uniphase Corporation
    Inventor: Ping-Chiek Koh
  • Bias-control for optical Mach-Zehnder modulators with voltage-induced optical absorption
    Patent number: 7715732
    Abstract: A bias-control circuit that provides operating point control for a Mach-Zehnder modulator experiencing optical absorption at their interferometric arms. The bias control circuit generates compensation signals that are used to counter the thermally induced index shifts as a result of absorption. In addition, an operating point with desirable transmitter characteristics can also be arbitrarily chosen by over-compensating or under-compensating thermal effects.
    Type: Grant
    Filed: August 5, 2005
    Date of Patent: May 11, 2010
    Assignee: JDS Uniphase Corporation
    Inventors: Ping-Chiek Koh, Michael C. Larson
  • INTEGRATED ON-CHIP INDUCTORS AND CAPACITORS FOR IMPROVED PERFORMANCE OF AN OPTICAL MODULATOR
    Publication number: 20090297088
    Abstract: An optical modulator for fiberoptic telecommunications is disclosed in which the optical signal velocity in the modulator waveguide and the electrical signal velocity in the traveling wave signal electrode are purposely mismatched by a factor of up to about 4. On-chip integrated inductors and capacitors are implemented to achieve the velocity mismatch. Improved electro-optic characteristics, such as return loss and sharper cut-off bandwidth are obtained.
    Type: Application
    Filed: May 28, 2009
    Publication date: December 3, 2009
    Applicant: JDS Uniphase Corporation
    Inventor: Ping-Chiek KOH
  • Bias-Control for Optical Mach-Zehnder Modulators with Voltage-Induced Optical Absorption
    Publication number: 20080094123
    Abstract: A bias-control circuit that provides operating point control for a Mach-Zehnder modulator experiencing optical absorption at their interferometric arms. The bias control circuit generates compensation signals that are used to counter the thermally induced index shifts as a result of absorption. In addition, an operating point with desirable transmitter characteristics can also be arbitrarily chosen by over-compensating or under-compensating thermal effects.
    Type: Application
    Filed: August 5, 2005
    Publication date: April 24, 2008
    Applicant: JDS UNIPHASE CORPORATION
    Inventors: Ping-Chiek Koh, Michael C. Larson