Patents by Inventor Gary Mak

Gary Mak 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).

  • Optical performance monitoring scheme
    Publication number: 20040208432
    Abstract: A method for determining optical power in a WDM optical signal that includes extracting a representative portion of the optical signal with wavelengths within some band &dgr; wherein &dgr; is a subset of &Dgr;, the set of all channel wavelengths present in the optical signal and measuring the intensity of the extracted optical signal to determine the optical power per channel for any of the channels whose wavelengths are within the band &dgr;.
    Type: Application
    Filed: March 29, 2002
    Publication date: October 21, 2004
    Inventors: Gary Mak, Shiguang Guo, Eric S. Maniloff
  • Optical amplification and receiving system and method
    Patent number: 6660990
    Abstract: Optical receiving methods and systems are disclosed. One such optical receiving system includes an optical amplifier operable to produce amplified optical signals satisfying a filterless detection specification limit, and an optical detector locatable in unfiltered communication with the optical amplifier to receive the amplified optical signals therefrom.
    Type: Grant
    Filed: June 1, 2001
    Date of Patent: December 9, 2003
    Assignee: Nortel Networks Limited
    Inventors: David W. Boertjes, Gary Mak
  • Optical amplifier gain control monitoring
    Patent number: 6646790
    Abstract: In a method and apparatus for tracking dynamic characteristics of an optical amplifier, optical signal probes are used to determine the gain and the corner frequency of the optical amplifier. A first optical probe having a predetermined modulation frequency above an expected corner frequency of the amplifier is used to estimate the gain of the optical amplifier. A second optical probe signal having a second predetermined modulation frequency at or below the expected corner frequency of the amplifier is used to estimate the corner frequency. These parameters can be used to optimize gain control of an optical amplifier.
    Type: Grant
    Filed: January 28, 2002
    Date of Patent: November 11, 2003
    Assignee: Nortel Networks Limited
    Inventors: Simon P. Parry, Eric S. Maniloff, Gary Mak, Andy Rowland, Franz H. Mok
  • Optical amplifier gain control monitoring
    Publication number: 20030142390
    Abstract: In a method and apparatus for tracking dynamic characteristics of an optical amplifier, optical signal probes are used to determine the gain and the corner frequency of the optical amplifier. A first optical probe having a predetermined modulation frequency above an expected corner frequency of the amplifier is used to estimate the gain of the optical amplifier. A second optical probe signal having a second predetermined modulation frequency at or below the expected corner frequency of the amplifier is used to estimate the corner frequency. These parameters can be used to optimize gain control of an optical amplifier.
    Type: Application
    Filed: January 28, 2002
    Publication date: July 31, 2003
    Applicant: Nortel Networks Limited
    Inventors: Simon P. Parry, Eric S. Maniloff, Gary Mak, Andy Rowland, Franz L.H. Mok
  • Optical receiving system and method
    Publication number: 20030042402
    Abstract: Optical receiving methods and systems are disclosed. One such optical receiving system includes an optical amplifier operable to produce amplified optical signals satisfying a filterless detection specification limit, and an optical detector locatable in unfiltered communication with the optical amplifier to receive the amplified optical signals therefrom.
    Type: Application
    Filed: June 1, 2001
    Publication date: March 6, 2003
    Inventors: David W. Boertjes, Gary Mak