Patents Assigned to General Photonics Corporation
  • Control of guided light in a waveguide
    Patent number: 6795616
    Abstract: A system for filtering light propagating in a waveguide is described. The system utilizes an adjustable periodic grating which induces mode coupling of predetermined frequencies of light propagating in the waveguide.
    Type: Grant
    Filed: August 26, 2003
    Date of Patent: September 21, 2004
    Assignee: General Photonics Corporation
    Inventor: Xiaotian Steve Yao
  • Transverse-pressure-controlled fiber devices
    Patent number: 6754404
    Abstract: Implementations of a polarization control method and apparatus are provided. In one implementation, a device uses super-polished squeezing surfaces to apply pressure against a polyimide coated fiber thereby minimizing micro-bending effects that cause losses in the fiber. Special control circuitry may be used to maintain a driving source of piezo-electrics that control the squeezing surfaces at a resonant frequency, thereby minimizing the voltages needed to drive the piezo-electrics.
    Type: Grant
    Filed: December 10, 2002
    Date of Patent: June 22, 2004
    Assignee: General Photonics Corporation
    Inventor: X. Steve Yao
  • Control of guided light in a waveguide
    Publication number: 20040037495
    Abstract: A system for filtering light propagating in a waveguide is described. The system utilizes an adjustable periodic grating which induces mode coupling of predetermined frequencies of light propagating in the waveguide.
    Type: Application
    Filed: August 26, 2003
    Publication date: February 26, 2004
    Applicant: General Photonics Corporation, a California corporation
    Inventor: Xiaotian Steve Yao
  • Thermal-induced waveguide gratings
    Patent number: 6628862
    Abstract: Techniques and devices for forming a controllable thermal grating in an optical waveguide.
    Type: Grant
    Filed: February 15, 2002
    Date of Patent: September 30, 2003
    Assignee: General Photonics Corporation
    Inventor: X. Steve Yao
  • Dynamic wavelength-selective grating modulator
    Patent number: 6628850
    Abstract: Techniques and devices for modulating an optical signal transmitting through an optical waveguide such as a fiber and a planar waveguide by dynamically controlling an adjustable grating formed in a cladding layer of the waveguide.
    Type: Grant
    Filed: February 14, 2002
    Date of Patent: September 30, 2003
    Assignee: General Photonics Corporation
    Inventor: X. Steve Yao
  • Control of guided light in waveguide using external adjustable grating
    Patent number: 6628861
    Abstract: A system for filtering light propagating in a waveguide is described. The system utilizes an adjustable periodic grating which induces mode coupling of predetermined frequencies of light propagating in the waveguide.
    Type: Grant
    Filed: January 6, 1999
    Date of Patent: September 30, 2003
    Assignee: General Photonics Corporation
    Inventor: Xiaotian Steve Yao
  • Dynamic control of polarization of an optical signal
    Patent number: 6576886
    Abstract: Techniques for dynamically controlling polarization of an optical signal by combining both feed-forward and feedback controls.
    Type: Grant
    Filed: February 20, 2002
    Date of Patent: June 10, 2003
    Assignee: General Photonics Corporation
    Inventor: X. Steve Yao
  • Transverse-pressure-controlled fiber devices
    Publication number: 20030081874
    Abstract: Implementations of a polarization control method and apparatus are provided. In one implementation, a device uses super-polished squeezing surfaces to apply pressure against a polyimide coated fiber thereby minimizing micro-bending effects that cause losses in the fiber. Special control circuitry may be used to maintain a driving source of piezo-electrics that control the squeezing surfaces at a resonant frequency, thereby minimizing the voltages needed to drive the piezo-electrics.
    Type: Application
    Filed: December 10, 2002
    Publication date: May 1, 2003
    Applicant: General Photonics Corporation
    Inventor: X. Steve Yao
  • Fiber devices based on fiber squeezer polarization controllers
    Patent number: 6493474
    Abstract: An improved polarization control method and apparatus is provided. The described invention uses super-polished squeezing surfaces to apply pressure against a polyimide coated fiber thereby minimizing micro-bending effects that cause losses in the fiber. Special control circuitry has also been designed to maintain a driving source of piezo-electrics that control the squeezing surfaces at a resonant frequency, thereby minimizing the voltages needed to drive the piezo-electrics.
    Type: Grant
    Filed: September 30, 2000
    Date of Patent: December 10, 2002
    Assignee: General Photonics Corporation
    Inventor: Xiaotian Steve Yao
  • WDM channel equalization and control
    Patent number: 6487336
    Abstract: Devices that couple variable attenuators to a single WDM multiplexer to individually adjust and control the power levels of different WDM channels, e.g., substantially equalizing the power levels of the channels. Optical reflection and in-fiber variable attenuators are implemented to simplify the device structure and reduce cost.
    Type: Grant
    Filed: October 11, 2001
    Date of Patent: November 26, 2002
    Assignee: General Photonics Corporation
    Inventor: Xiaotian Steve Yao
  • Fiber squeezer polarization controller with low activation loss
    Patent number: 6480637
    Abstract: An improved polarization control method and apparatus is provided. The described invention uses super-polished squeezing surfaces to apply pressure thereby minimizing micro-bending effects that cause losses in the fiber. Special control circuitry has also been designed to maintain a driving source of piezo-electrics that control the squeezing surfaces at a resonant frequency, thereby minimizing the voltages needed to drive the piezo-electrics.
    Type: Grant
    Filed: September 30, 2000
    Date of Patent: November 12, 2002
    Assignee: General Photonics Corporation
    Inventor: Xiaotian Steve Yao