Patents Represented by Attorney, Agent or Law Firm Neil Teitelbaum
  • Patent number: 8198638
    Abstract: A light emitting device structure, wherein the emitter layer structure comprises one or more device wells defined by thick field oxide regions, and a method of fabrication thereof are provided. Preferably, by defining device well regions after depositing the emitter layer structure, emitter layer structures with reduced topography may be provided, facilitating processing and improving layer to layer uniformity. The method is particularly applicable to multilayer emitter layer structures, e.g. comprising a layer stack of active layer/drift layer pairs. Preferably, active layers comprise a rare earth oxide, or rare earth doped dielectric such as silicon dioxide, silicon nitride, or silicon oxynitride, and respective drift layers comprise a suitable dielectric, preferably silicon dioxide, of an appropriate thickness to control excitation energy. Pixellated light emitting structures, or large area, high brightness emitter layer structures, e.g.
    Type: Grant
    Filed: July 14, 2010
    Date of Patent: June 12, 2012
    Assignee: Group IV Semiconductor Inc.
    Inventors: Thomas MacElwee, Alasdair Rankin
  • Patent number: 6810169
    Abstract: A modular optical platform for selective wavelength switching that can be adapted to perform various other functions, such as dynamic gain equalization (DGE) and add/drop multiplexing (ADM) provides the versatility and modularity that will be essential to the future of the fiber optics industry. The basic platform includes a first lens for directing an optical signal, a diffraction grating for dispersing an optical signal into its component wavelength channels, a second lens for directing the component wavelength channels, and a modifying device for conducting one or more of a variety of functions including switching, DGE and ADM. The first and second lens are preferably replaced by a single concave reflective mirror having optical power.
    Type: Grant
    Filed: June 10, 2002
    Date of Patent: October 26, 2004
    Assignee: JDS Uniphase Inc.
    Inventor: Oleg Bouevitch
  • Patent number: 6809820
    Abstract: The method and apparatus of laser-induced incandescence (LII) to analyze characteristics of submicron-sized particles are described. LII is recognized as a good tool for determining the characteristics of small particles in a gas, e.g., volume fraction, particle size, and specific surface area. It uses the fact that the incandescence signal is proportional to the volume of the particles. It also uses the fact that transient cooling is dependent on the specific surface area of the particle, which is related to diameter of the particle. In LII, particles are heated by a pulsed laser light beam to a temperature where incandescence from the particles can be distinguished from ambient light. The temperature of particles and their volume fraction governs the incandescence. The temperature decay rate is proportional to the primary particle size. The invention uses an optical arrangement that ensures a near-uniform laser energy distribution spatial profile.
    Type: Grant
    Filed: January 13, 2004
    Date of Patent: October 26, 2004
    Assignee: National Research Council of Canada
    Inventors: David R. Snelling, Gregory J. Smallwood, Omer L. Gulder, Fengshan Liu
  • Patent number: 6807009
    Abstract: The invention provides an optical device including a polarization diversity unit for receiving an input optical signal and producing two beams of light having a same polarization state therefrom, a beam swapping element disposed for receiving the first and second beams of light and for redirecting the two beams of light to a same overlapping area of a modulator, and a reflective surface for reflecting the two beams of light back to the polarization diversity unit where they are combined to form an output optical signal. The beam swapping element is designed and positioned such that the first and second beams of light swap positions upon reflection from the reflective surface and trace out the other's optical path. Advantageously, this optical arrangement essentially eliminates all PDL and PMD.
    Type: Grant
    Filed: November 13, 2002
    Date of Patent: October 19, 2004
    Assignee: JDS Uniphase Inc.
    Inventors: John Paul Morgan, Joshua Philipson
  • Patent number: 6807340
    Abstract: A dispersion compensator has a linearly chirped fiber Bragg grating mounted at two ends of an elongated, channel-shaped heat distributor. The distributor has two thermo-electric coolers at two ends, a heating strip for uniform heating of the distributor, a temperature sensor mounted on the distributor in the middle of the grating region, and longitudinally variable heating means attached to the distributor and extending along its length for effecting a longitudinally varying heating of the grating region. The provision of the heating strip helps maintain linearity of the thermal gradient of the distributor while the longitudinally variable heaters facilitate relatively fast dithering of the temperature of the grating region.
    Type: Grant
    Filed: August 28, 2002
    Date of Patent: October 19, 2004
    Assignee: JDS Uniphase Inc.
    Inventors: Henry Postolek, Graham Ian Duck, Nenad Duricic, Gonzalo de la Puente, Tinko Eftimov, Dan Grobnic, David William Charles Markin, Martin Matthews, Evgueni A. Ponomarev, Serguei Roupassov, Dariusz Sieniawski
  • Patent number: 6798948
    Abstract: The present invention relates to an optical filter comprising an integrated wavelength dispersive element having an input for providing temperature compensation, particularly for providing passive temperature compensation in an arrayed waveguide grating. The present invention has found that by providing an arrayed waveguide grating having a thermally responsive pivotal input structure for changing an angle of a collimated input signal launched into a focusing lens, the input point can be selected in response to changing temperature in order to compensate for thermal drift of the center wavelength. Further, the present invention has found that by providing a reflective lens assembly for focusing an input signal at a selected input point of the input planar waveguide, alignment and tuning of an input and assembly can be improved and simplified.
    Type: Grant
    Filed: April 20, 2001
    Date of Patent: September 28, 2004
    Assignee: JDS Uniphase Inc.
    Inventors: Vincent Delisle, Alan J. P. Hnatiw
  • Patent number: 6788712
    Abstract: A simple and flexible WDM laser source is disclosed using a loop erbium-doped fiber amplifier (LEDFA) configuration. The loop serves as a mirror and as an amplification medium. The laser cavity was made from the loop mirror and a set of fiber Bragg gratings (FBGs) which select the proper lasing wavelengths. The FBGs can be placed either in parallel or in series at the output of the loop configuration. Optical attenuators are placed in front of the FBG to control the flatness of the laser source output and determine the required lasing condition for each wavelength to avoid competition of the different lasing wavelengths. This configuration is flexible for adding any number of wavelengths as long as enough amplified spontaneous emission (ASE) is generated in the loop. Signal to noise ratio as high as 55-dB can be achieved.
    Type: Grant
    Filed: March 22, 2001
    Date of Patent: September 7, 2004
    Assignee: Oprel Technologies, Inc.
    Inventor: Ahmad Atieh
  • Patent number: 6768874
    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 in the form of 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. Advantageously, the input and output angle of the signal can be varied to provide fine tuning. This invention provides a device and method to achieve that end.
    Type: Grant
    Filed: November 1, 2000
    Date of Patent: July 27, 2004
    Assignee: JDS Fitel Inc.
    Inventors: Paul Colbourne, Jimin Xie, Xiaoli Fu
  • Patent number: 6763154
    Abstract: The invention provides polarization state changer and a phase shifter for shifting a phase of an optical signal including a waveguide having a waveguiding region for guiding the optical signal therethrough, a substrate for supporting said waveguide, and means for inducing stress on the waveguiding region for shifting the phase of the optical signal. The stress is induced by MEMS means. The MEMS means are monolithically formed on the substrate and can be actuated by electrostatical force, mechanical force, or tiltable flaps.
    Type: Grant
    Filed: May 20, 2002
    Date of Patent: July 13, 2004
    Assignee: JDS Uniphase Inc.
    Inventors: Robert I. MacDonald, Barrie Keyworth, Alan J. P. Hnatiw
  • Patent number: 6760501
    Abstract: An optical beam path directing system has a field-flattening optically transmissive wedge installed in spatially dispersed beam paths upstream of the planar surface of a micro electro-mechanical switch (MEMS) or liquid crystal array. The parameters of the field-flattening wedge and its location in the diffracted beam paths are defined such that the wedge effectively rotates a ‘best fit’ planar surface approximation of the curvilinear focal plane of a concave reflector into coplanar coincidence with the optical signal-receiving surface of the MEMS. As a result, loss variation is essentially flat and minimized across the optical signal transmission band.
    Type: Grant
    Filed: May 23, 2002
    Date of Patent: July 6, 2004
    Assignee: JDS Uniphase Inc.
    Inventors: Rajiv Iyer, Jacques Bismuth
  • Patent number: 6721477
    Abstract: The filtering of optical signals, and in particular the interleaving/de-interleaving of optical signals is becoming a necessary step in Dense-Wavelength Division Multiplexing (D-WDM), because of a requirement for smaller channel spacing due to higher levels of traffic. Finite Impulse Response (FIR) filters, including lattice and birefringent waveplate versions, are a particular type of optical filter used for interleavering/de-interleavering optical channels, which can be defined by their transfer function H(f). To ensure dispersion free filtering, the present invention provides a cascaded optical filter, comprising two optical filters, wherein the transfer function of the second filter is the complex conjugate of the first filter, i.e. H2(f)=H1*(f), or the complex conjugate of the first filter H1*(f) multiplied by the transfer function of a dispersion free optical filter G(f).
    Type: Grant
    Filed: May 3, 2001
    Date of Patent: April 13, 2004
    Assignee: JDS Uniphase Inc.
    Inventors: Oleg Bouevitch, Thomas Ducellier
  • Patent number: 6711316
    Abstract: An optical cross-connect having an input port for launching a beam of light into the optical cross-connect, at least two output ports, each output port for selectively receiving a beam of light, a dispersive element for dispersing the beam of light into separate wavelength channels, and a switch core for independently switching at least one individual wavelength channel between ports. The switch core includes a cylindrical ATO element, two cylindrical relay lenses, and two opposing deflector arrays. Conveniently, the deflector arrays are either liquid crystal phase arrays or reflective MEMS arrays.
    Type: Grant
    Filed: July 24, 2002
    Date of Patent: March 23, 2004
    Assignee: JDS Uniphase Inc.
    Inventor: Thomas Ducellier
  • Patent number: 6711311
    Abstract: This invention relates to elements such as birefringent crystals, which are used to separate a non-collimated input beam into two orthogonally polarized sub-beams or to combine two orthogonally polarized beams into a single beam. The optical device lessens or obviates the optical path length difference encountered in prior art devices and provides a polarization beam splitter/combiner that has substantially same optical path lengths for two split or combined beams propagating therethrough. Alternatively, the device is designed to provide a selected path length difference to compensate for polarization mode dispersion in other optical devices.
    Type: Grant
    Filed: April 18, 2001
    Date of Patent: March 23, 2004
    Assignee: JDS Uniphase Inc.
    Inventors: Vincent Delisle, Gonzalo Wills, Pierre D. Wall, Alan J. P. Hnatiw, Yihao Cheng, Dean Sheldon Spicer, Sheldon McLaughlin
  • Patent number: 6707959
    Abstract: A fiber optic wavelength switch that includes a front-end unit having optical ports for receiving and transmitting optical signals; a wavelength dispersion element (e.g., diffraction grating, prism, etc.) for defining a dispersion plane; a light redirecting element (e.g., spherical reflector) associated with the wavelength dispersion element; and an actuation array (e.g., MEMS) operative with the light redirecting element for tilting an optical signal substantially perpendicular to the dispersion plane defined by the wavelength dispersion element. The wavelength switch can be implemented as a one input/output port and several add/drop ports type device, which can add/drop wavelengths from/to the in/out port. The front-end unit having a fiber array coupled to a micro-lens array with optical signals from the micro-lens being directed by a further lens.
    Type: Grant
    Filed: January 22, 2002
    Date of Patent: March 16, 2004
    Assignee: JDS Uniphase Inc.
    Inventors: Thomas Ducellier, Filippus Stefanus Roux, Jacques Bismuth
  • Patent number: 6701043
    Abstract: The present invention relates to an arrayed waveguide grating having a reflective input that permits variable coupling to adjust the center wavelength. The present invention has found that by providing an arrayed waveguide grating having one or more precisely positioned input waveguides coupled through a reflective lens assembly, for providing a lateral offset to a signal propagating from the input waveguide to the planar waveguide, and for focusing a reflected input signal at a selected input point of the input planar waveguide, alignment and tuning of an input and assembly can be improved and simplified. Advantageously, variable coupling parameters can be incorporated into the reflective coupling including input position, waveguide taper and planar waveguide length increment to provide relatively simple tuning in an integrated device. Compensation for polarization effects and thermal effects can also be provided in the reflective coupling.
    Type: Grant
    Filed: April 18, 2001
    Date of Patent: March 2, 2004
    Assignee: JDS Uniphase Inc.
    Inventors: Vincent Delisle, Steven David Oliver, Alan J. P. Hnatiw
  • Patent number: 6654564
    Abstract: A method and device is disclosed for dispersion compensation of an optical signal. By providing two filters having a sloped dispersion and opposite in sign over a wavelength band wherein one filter is tunable, a controllable amount of dispersion can be introduced to offset or compensate dispersion. Preferably one of the filters is a tunable periodic device in the form of a multi-cavity GT etalon. In a preferred embodiment of the filters can be designed to provide various controllable but different constant amounts of dispersion.
    Type: Grant
    Filed: August 7, 2000
    Date of Patent: November 25, 2003
    Assignee: JDS Uniphase Inc.
    Inventors: Paul Colbourne, Xiaoli Fu
  • Patent number: 6650406
    Abstract: In order to calibrate an apparatus for measuring the polarization dependent loss of an optical device under test, a set of nominal polarization states of incident light are generated with a polarization generator. The incident light is then passed through a dot-product conserving polarization rotator at a first setting. A transmission characteristic is measured through a standard optical component with a known polarization dependent loss value for each polarization state. This step is repeated for a number of different settings of the polarization rotator. A polarization dependent loss value is calculated for the standard optical component based on the measured transmission characteristics at each polarization rotator setting. The calculated polarization dependent loss values are then processed to generate an aggregate error value.
    Type: Grant
    Filed: September 9, 2002
    Date of Patent: November 18, 2003
    Assignee: JDS Uniphase Inc.
    Inventors: Louis B. Allard, Jonathan Paradis, John C. Martinho
  • Patent number: 6643446
    Abstract: The invention provides a hermetic fiber-optic seal, such as in an optical fiber ferrule or feedthrough, having an optical fiber, a glass solder for encasing at least a portion of the optical fiber, a first glass sleeve for encasing at least a first portion of the glass solder, a second glass sleeve for encasing at least a second portion of the glass solder, and an outer sleeve for encasing at least a portion of the first glass sleeve and the second glass sleeve. A gap filled with glass solder may be provided between the first glass sleeve and the second glass sleeve. The hermetic fiber-optic seal is made by an extrusion process.
    Type: Grant
    Filed: November 27, 2001
    Date of Patent: November 4, 2003
    Assignee: JDS Uniphase Inc.
    Inventors: Abdul Jaleel K. Moidu, William Thomas Moore
  • Patent number: 6625002
    Abstract: An important consideration in making a fiber optic device (e.g., comprising fiber in a polished tube at a certain angle and GRIN lens) is to limit sense, maintain and/or measure the gap-width between these two polished surfaces before they are either fused or glued for optimum performance. In automating the configuration, the gap is sensed, apart from optimizing in the transverse plane to minimize the loss. In the present application, a limit sensing method and system is provided to improve the effectiveness in automated manufacturing systems, by exploiting the electromechanical properties of induced EMF (Electro-Magnetic Force) by an electrical coil in presence of a magnet at mechanical resonance. Once it is known when two optical surfaces to be glued are said to have zero gap (i.e., contact between the surfaces), the present system provides an annunciation from limit-sensing electronics.
    Type: Grant
    Filed: July 12, 2001
    Date of Patent: September 23, 2003
    Assignee: JDS Uniphase Inc.
    Inventors: Srikanth Ramakrishnan, Krassimir Stoev, Dusan Ivancevic
  • Patent number: 6618517
    Abstract: A high capacity cross-connect in which a 3D switch core includes express paths that facilitate cascading of cross-connect blocks. A light beam propagates from an input waveguide 18 to a first MEMS mirror, which deflects the light beam to either an express optical path or a switching optical path. In the express optical path, the light beam propagates from the first MEMS mirror to a predetermined output waveguide, which is determined by the design of the switch core. In the switching optical path, the light beam propagates from the first MEMS mirror to a second MEMS mirror, which deflects the light beam to a selected one of a set of two or more output waveguides associated with the second MEMS mirror.
    Type: Grant
    Filed: October 26, 2001
    Date of Patent: September 9, 2003
    Assignee: JDS Uniphase Inc.
    Inventors: Thomas Ducellier, Robert Ian MacDonald