Patents by Inventor Paul Colbourne

Paul Colbourne 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).

  • Patent number: 6438284
    Abstract: The invention provides an optical deflection switch having reduced insertion loss. The device includes a switching block having a reflective surface and a transmissive face, a second block having a first and a second face, and a switch for selectively switching the device from a first switching state to a second switching state. The optical deflection switch of the present invention provides a switch in which a deflected beam is directed to one of a plurality of output ports at normal incidence and hence the insertion loss of the optical deflection switch is reduced. The output beam in the first switching state is parallel to the output beam in the second switching state.
    Type: Grant
    Filed: December 15, 1999
    Date of Patent: August 20, 2002
    Assignee: JDS Uniphase Inc.
    Inventor: Paul Colbourne
  • Publication number: 20020109904
    Abstract: The invention provides a fast variable optical attenuator including a reflective membrane that serves as a varifocal mirror. Electrostatic deflection of the mirror defocuses the optical system and attenuates an optical signal launched to the mirror from an input port to an output port. Since the mirror is generally limited to deflections less than 1 micron, fast attenuation within a small (<5 dB) dynamic range is achieved. The dynamic range is improved by combining the fast attenuator with a slower attenuator. In the preferred embodiment, the slow and fast attenuator are not coupled via optical waveguides, but rather are optically coupled via free space or are integrated in the same device. Advantageously, this compact arrangement reduces the excess loss associated with optical fiber coupling and lowers packaging costs.
    Type: Application
    Filed: February 15, 2001
    Publication date: August 15, 2002
    Inventors: Robert I. MacDonald, Lianxiang Yang, Phillipe Lonjoux, Paul Colbourne, Mohiuddin Mala
  • Publication number: 20020090169
    Abstract: The invention provides an optical switch having an input port for launching a beam of light into the optical switch, at least two output ports, each output port for selectively receiving a beam of light, an ATO element having optical power for providing an angle to offset transformation, and beam directing means for selectively directing a beam of light from the input port to a selected one of the at least two output ports along an optical path via the ATO element. The ATO element is a lens or a mirror.
    Type: Application
    Filed: November 19, 2001
    Publication date: July 11, 2002
    Inventors: Thomas Ducellier, Rajive Iyer, Andrew Tsiboulia, Paul Colbourne, Robert I. MacDonald
  • Patent number: 6359685
    Abstract: A laser system is disclosed wherein a tunable laser signal has encoded within it information related to its wavelength at any instant in time. This encoding in one example is performed by modulating the signal to contain its wavelength information. This is particularly useful in a distributed system for testing optical components, wherein at a test site, the test station must determine the wavelength of light at which a component was tested.
    Type: Grant
    Filed: September 24, 1999
    Date of Patent: March 19, 2002
    Assignee: JDS Uniphase Corporation
    Inventors: Paul Colbourne, Gary Duck, Bruce Nyman, Donald R. Zimmerman
  • Patent number: 6353692
    Abstract: A one-sided switch for redirecting light between adjacent ports. The switch uses a moveable refractor, in combination with a lens and a stationary reflector, to redirect light from one optical port to another. In a most simple embodiment light is redirected from one output port to another by repositioning the refractor in the optical path of the light and using only a single lens for collimating and focussing the light at the reflector and about the ports, respectively.
    Type: Grant
    Filed: February 17, 2000
    Date of Patent: March 5, 2002
    Assignee: JDS Uniphase Inc.
    Inventor: Paul Colbourne
  • Publication number: 20020009257
    Abstract: An optical device for rerouting and modifying an optical signal that is capable of operating as a dynamic gain equalizer (DGE) and/or a configurable optical add/drop multiplexer (COADM) is disclosed. The optical design includes a front-end unit for providing a collimated beam of light, an element having optical power for providing collimating/focusing effects, a diffraction element for providing spatial dispersion, and modifying means which in a preferred embodiment includes one of a MEMS array and a liquid crystal array for reflecting and modifying at least a portion of a beam of light. The modifying means functions as an attenuator when the optical device operates as a DGE and as a switching array when the optical device operates as a COADM.
    Type: Application
    Filed: December 5, 2000
    Publication date: January 24, 2002
    Inventors: Oleg Bouevitch, Thomas Ducellier, W. John Tomlinson, Paul Colbourne, Jacques Bismuth
  • Publication number: 20010021053
    Abstract: A method and device is disclosed for dispersion compensation of an optical signal having periodic dispersion within a multi-channels system. For example interleaved optical channels often exhibit dispersion having a characteristic that is repeated in adjacent channels. By providing a periodic device that allows for polarization dependent routing of an interleaved signal to allow for multiple passes of said signal through a multi-cavity GT etalon, having a free-spectral range that corresponds to the channel spacing, the dispersion in the interleaved signal can be lessened and practically obviated or balanced to a desired level. This invention provides a device and method to achieve that end.
    Type: Application
    Filed: April 3, 2001
    Publication date: September 13, 2001
    Inventors: Paul Colbourne, Kuochou Tai, Jyehong Chen, Kok Wai Chang
  • Patent number: 6262822
    Abstract: The present invention relates to a circuit for monitoring optical signals in a multiple channel system. A tunable band pass filter receives and input signal comprising multiple channels each having a different wavelength and predetermined channel spacing. Output from the tunable filter is directed to a second filter having a periodic response with wavelength, such as an etalon. The response is designed to block wavelengths of light corresponding to the channels, permitting noise in the inter-channel space to be measured by a detector. A reference circuit launches light from a broad band source through a Bragg grating into the tunable filter. The Bragg grating reflects a known reference wavelength. Light which passes from the reference source through the tunable filter is also passed through the second filter to a detector. When a notch is detected by the reference detector, the tunable filter is known to be tuned to the reference wavelength.
    Type: Grant
    Filed: May 13, 1998
    Date of Patent: July 17, 2001
    Assignee: JDS Fitel Inc.
    Inventors: Jasvinder Obhi, Paul Colbourne
  • Patent number: 6188809
    Abstract: Broad wavelength tuning range are achieved in an effectively reset-free, optical, automatic polarization controller by providing a device and method for varying the polarization of an input beam of light. A block of electro-optic material has two pairs of electrodes for applying a voltage across the block. Light is launched into an input end of the block for receiving the input beam of light. A controller controls a quadrature voltage applied to the first and a second pair of electrodes; the quadrature voltage has the form of a magnitude and an angle. The quadrature voltage can be varied in such a manner as to orient a given electric field within the electro-optic material through a plurality of angles, for example between 0 and 2&pgr; radians; the magnitude of the quadrature voltage can be set to create an arbitrary retardance from 0 to 2&pgr;. Any output polarization state can be realized by appropriately varying the magnitude and angle of the voltage applied to the Vx and Vy electrodes.
    Type: Grant
    Filed: January 13, 1999
    Date of Patent: February 13, 2001
    Assignee: JDS Fitel Inc.
    Inventors: Jacques Bismuth, Michael Trzecieski, Rajiv Iyer, Paul Colbourne
  • Patent number: 6125220
    Abstract: A method and circuit is disclosed wherein two beams exiting opposite ends of a resonant optical cavity, such as a Fabry-Perot (FP) etalon for example, are provided via waveguides or via free space directed by mirrors to a combining region where the beams can interfere with one another to provide a desired output response. In one embodiment, multiplexed channels of light can be demultiplexed by the device described heretofore, or alternatively, the phase relationship between these two beams can be altered prior to their being combined to provide, for example, a linearized output response useful in applications such as wavelength locking. By varying the reflectivity of the optical cavity reflectors and/or by varying the phase relationship between the two beams exiting the optical cavity, a variety of desired output responses can be realized.
    Type: Grant
    Filed: March 25, 1999
    Date of Patent: September 26, 2000
    Inventors: Nigel Copner, Paul Colbourne, Joshua B. J. Philipson
  • Patent number: 6118530
    Abstract: A reference system for an optical wavelength scanner, used for measuring wavelengths of radiation from an optical device. The system utilizes a wavelength reference comprising a fixed fiber Fabry-Perot (FFP) filter in combination with a reference fiber Bragg grating (FBG) having an accurately known reflection wavelength to minimize the effects of drift and non-linearities in the scanner and to allow a simple flexure element to be used to position a dispersive grating. The wavelengths of the reference comb of the fixed FFP are determined by reference to that of the reference FBG. Then, the peaks or notches in the light intensity from the device under test are located with respect to the comb of peaks produced by the reference. In a most simple embodiment two ports are coupled so as to provide their output light to the dispersive element simultaneously and only a single collimating lens is required for collimating light from the output ports.
    Type: Grant
    Filed: May 18, 1999
    Date of Patent: September 12, 2000
    Inventors: Oleg Bouevitch, Paul Colbourne
  • Patent number: 6061124
    Abstract: A method and apparatus of generating a test signal for broadcast to a plurality of locations for testing optical devices is disclosed. A tunable laser sweeps from a lower wavelength to a higher upper wavelength providing a test station with a variable input signal. A timing signal generated from the variable input signal is provided to the test station to determine the frequency of the variable input signal so that tests may be performed at several known wavelengths. Amplification is added to the system to provide sufficient power to the variable input signal and timing signal both split by a splitter to be provided to multiple test stations simultaneously.
    Type: Grant
    Filed: January 21, 1998
    Date of Patent: May 9, 2000
    Inventors: Bruce Nyman, Paul Colbourne, Donald R. Zimmerman
  • Patent number: 6040932
    Abstract: A system and method are disclosed for demulitplexing closely spaced channels carrying optically encoded data. A composite optical signal having data channels corresponding to center wavelengths .lambda.1, .lambda.2, .lambda.3, .lambda.4, . . . .lambda.n are separated into two composite optical signals of first of which comprises data channels corresponding to center wavelengths .lambda.1, .lambda.3, . . . .lambda.n and a second which comprises data channels corresponding to center wavelengths .lambda.2, .lambda.4, . . . .lambda.n-1, wherein adjacent channels center wavelengths are separated from one another by a distance "d". A periodic multi-cavity Fabry-Perot etalon having a free spectral range of "2d" is coupled to a circulator for launching an input beam. The first of the two composite optical signals carrying channels 1, 3, . . . n is reflected from the input port of the etalon and the second of the of the two optical signals carrying channels 2, 4, . . . n-1 is transmitted through the etalon.
    Type: Grant
    Filed: May 29, 1997
    Date of Patent: March 21, 2000
    Inventors: Gary S. Duck, Koichi Abe, Joseph Ip, Mark Farries, Paul Colbourne
  • Patent number: 6018603
    Abstract: A device capable of demultiplexing or multiplexing optical signals includes a wavelength dependent element for separating an input beam into sub-beams of light in accordance with their wavelength. Precisely spaced optical fibers are disposed to receive at least some of the sub-beams of light; a focusing lens is disposed between the wavelength dependent element and the optical fibers for focusing the sub-beams at ends of the optical fibers. A rod-like GRIN lens for correcting for an offset in the focal length of the focusing lens is placed between the focusing lens and the optical fibers. The GRIN lens can be polished to change its length in order to correct for the offset in focal length of the focusing lens.
    Type: Grant
    Filed: September 5, 1997
    Date of Patent: January 25, 2000
    Inventors: Kent R. Lundgren, Paul Colbourne
  • Patent number: 5915063
    Abstract: A variable, hybrid optical attenuator has a flexure member which consists of a bridge portion joining two prongs which are flexibly movable relative to the bridge portion. A mirror is mounted on the bridge portion. The prongs are each connected to an actuator which can expand or contract in response to a control signal applied thereto. The control signal may be heat, an electric field, a magnetic field or, preferably, a combination thereof. The attenuator is positioned opposite a pair of optical waveguides so that an input optical signal from an input waveguide is incident on the mirror and, upon reflection, is received by the second waveguide. Attenuation of the transmission is effected by controlled tilting of the mirror caused by appropriate control signals, single or in combination, applied to one or both of the actuators.
    Type: Grant
    Filed: June 23, 1997
    Date of Patent: June 22, 1999
    Inventors: Paul Colbourne, Jasvinder Obhi, Neil Teitelbaum
  • Patent number: 5896193
    Abstract: A method and apparatus of generating a test signal for broadcast to a plurality of locations for testing optical devices is disclosed. A tunable laser sweeps from a lower wavelength to a higher upper wavelength providing a test station with a variable input signal. A timing signal generated from the variable input signal is provided to the test station to determine the frequency of the variable input signal so that tests may be performed at several known wavelengths. Amplification is added to the system to provide sufficient power to the variable input signal and timing signal both split by a splitter to be provided to multiple test stations simultaneously.
    Type: Grant
    Filed: February 14, 1997
    Date of Patent: April 20, 1999
    Assignee: JDS Fitel Inc.
    Inventors: Paul Colbourne, Gary S. Duck, Vasile Prunes, Carey M. Garrett
  • Patent number: 5798859
    Abstract: A method and device for wavelength locking is provided, wherein an element having a wavelength dependent characteristic such as a Fabry Perot etalon is used to provide an output signal having an intensity that varies with wavelength. The intensity of a reference signal derived from an input signal is compared with an output from the Fabry Perot etalon to provide a feedback signal that corresponds to the frequency of the input signal. The system is calibrated before wavelength locking is performed to determine a ratio of intensities that determines a locked state or condition.
    Type: Grant
    Filed: June 20, 1996
    Date of Patent: August 25, 1998
    Assignee: JDS Fitel Inc.
    Inventors: Paul Colbourne, Joseph Ip, Neil Teitelbaum
  • Patent number: 5666225
    Abstract: A multi-pass Fabry-Perot etalon, or bandpass, filter, has a Fabry-Perot cavity defined by two partially reflective mirrors with a gap therebetween and a third reflecting mirror positioned adjacent said two mirrors and arranged to reflect substantially any light eliting said cavity back into it. The filter can replace two single-pass Fabry-Perot etalon filters and can provide lower signal loss and simpler wavelength control.
    Type: Grant
    Filed: February 26, 1996
    Date of Patent: September 9, 1997
    Assignee: JDS Fitel Inc.
    Inventor: Paul Colbourne