Patents Examined by Phan T. H. Palmer
  • Patent number: 7194169
    Abstract: An adjustable aperture system includes a stationary aperture operable to remove a portion of a lower intensity light communicated through a light bundle. The system also includes an adjustable aperture comprising a notch and capable of varying an amount of projection light communicated through the light bundle. In one particular embodiment, the notch operates to reduce the effect of the adjustable aperture on a high intensity light communicated through the light bundle. The system further includes a control motor operable to receive a control signal and to selectively manipulate the adjustable aperture.
    Type: Grant
    Filed: December 30, 2003
    Date of Patent: March 20, 2007
    Assignee: Texas Instruments Incorporated
    Inventors: Roger M. Ikeda, Steven M. Penn
  • Patent number: 7123798
    Abstract: An optical fiber, which is provided in each of channels of an optical fiber array disposed on V-grooves, has a portion (reflecting section) at which a core is cut out at an intermediate position of the optical fiber. The reflected light, which is split from a signal light transmitted in the core of the optical fiber on the basis of a refractive index difference at the reflecting section, is obtained through a index matching layer provided outside a clad of the optical fiber. The reflected light is monitored by a photodetector of a photodetecting array.
    Type: Grant
    Filed: March 25, 2003
    Date of Patent: October 17, 2006
    Assignee: NGK Insulators, Ltd.
    Inventors: Masashi Fukuyama, Akiyoshi Ide
  • Patent number: 7123792
    Abstract: The invention relates to the field of grating structures. The invention provides a longitudinal grating having an aperiodic structure, wherein the grating has a selected response characteristic and any repeated unit cell in the structure is significantly longer than a characteristic length associated with the selected response characteristic.
    Type: Grant
    Filed: March 3, 2000
    Date of Patent: October 17, 2006
    Assignee: RJ Mears, LLC
    Inventors: Robert Joseph Mears, Michael Charles Parker
  • Patent number: 7103244
    Abstract: A DWDM add/drop system for use in optical communication system is disclosed. Using semiconductor fabrication techniques, a plurality of waveguide arrays and signal carriers are substantially symmetrically arranged about an optical axis of the system. Electrode heaters are provided proximate junctions created at the intersections of selected waveguides. Using the heaters, portions of optical signals may be redirected to other waveguides. In addition, the heaters may be used to attenuate or otherwise modify signals in the waveguides. The waveguide arrays are arranged such that a plurality of signal processing operations may be performed substantially simultaneously. In a preferred embodiment, the switches and waveguide arrays are coupled with a light focusing device and a dispersion apparatus to form a switched, combined multiplexer/demultiplexer having signal attenuation and modification capabilities.
    Type: Grant
    Filed: March 14, 2002
    Date of Patent: September 5, 2006
    Assignee: Finisar Corporation
    Inventors: Ray T. Chen, William W. Morey
  • Patent number: 7085445
    Abstract: As the traffic volume carried by telecommunication networks has been rapidly increased as a result of the bandwidth-intensive applications such as Internet access, electronic commerce, multimedia applications, and distributed computing, it is imperative to utilize the optical network for backbone, metropolitan, and local area networks. The optical networks employing optical fibers as the transmission medium have exhibited a superior performance/cost ratio for both long-haul and short-haul routes and the emerging dense wavelength division multiplexing (DWDM)/all-optical networks have shown a promising potential to improve speed, capacity and connectivity of optical telecommunication networks. The present invention provides Micro-Opto-Electro-Mechanical Waveguide Switch (MOEM-WS) by integrating MEMS actuators and micromachined PLCs on the same substrate.
    Type: Grant
    Filed: June 24, 2003
    Date of Patent: August 1, 2006
    Inventors: Seungug Koh, Danjin Wu
  • Patent number: 7054517
    Abstract: An apparatus comprises: a planar optical waveguide having sets of locking diffractive elements and means for routing optical signals; and corresponding lasers. Lasers launch signals into the planar waveguide that are successively incident on elements of the locking diffractive element sets, which route fractions of the signals back to the lasers as locking feedback signals. The routing means route between lasers and output port(s) portions of those fractions of signals transmitted by locking diffractive element sets. Locking diffractive element sets may be formed in channel waveguides formed in the planar waveguide, or in slab waveguide region(s) of the planar waveguide. Multiple routing means may comprise routing diffractive element sets formed in a slab waveguide region of the planar waveguide, or may comprise an arrayed waveguide grating formed in the planar waveguide. The apparatus may comprise a multiple-wavelength optical source.
    Type: Grant
    Filed: August 21, 2004
    Date of Patent: May 30, 2006
    Assignee: LightSmyth Technologies Inc
    Inventors: Thomas W. Mossberg, Dmitri Iazikov, Christoph M. Greiner
  • Patent number: 7052187
    Abstract: A pair of guide holes for guide pin insertion and one or a plurality of optical fiber positioning holes extending inwardly from the front end surface are formed in a connector ferrule of an optical connector. A chamfer is formed on the opening edge portion of the guide hole of the connector ferrule on the front end surface side thereof. The opening diameter R of the guide hole at the front end surface is preferably 1.0 to 1.5 mm when the front end surface is slant polished at an angle of 8 degrees. Furthermore, the chamfering angle ? of the chamfer is preferably 90 to 150 degrees. Moreover, the average particle size of the filler contained in the connector ferrule is no more than 20 ?m. As a result, the surface of the chamfer is comparatively smooth.
    Type: Grant
    Filed: February 28, 2002
    Date of Patent: May 30, 2006
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Kenichiro Ohtsuka, Yoshikyo Tamekuni, Hiroshi Katsura, Tomohiko Ueda, Toshiaki Kakii
  • Patent number: 7037003
    Abstract: Techniques are described for reducing splice loss between a pair of optical fibers. A first fiber is spliced to a second fiber at a splice point. A region of the spliced fibers, including the splice point, is thermally treated to cause a controlled diffusion of dopants in the region. A controlled tension is then applied to the splice region while heating it to a predetermined temperature to produce a controlled change in the splice region's strain state. Further described is a heat and tension station for performing a heat and tension technique on a pair of spliced fibers.
    Type: Grant
    Filed: November 12, 2002
    Date of Patent: May 2, 2006
    Assignee: Fitel USA Corp.
    Inventors: Erling D. Christensen, Torben E. Veng, Andrew D. Yablon
  • Patent number: 7035514
    Abstract: A glass base material, which is a base material of an optical fiber, comprising: a core; and a clad surrounding the core; wherein: a rate of change in a relative-refractive-index-difference between the core and the clad in a longitudinal direction of the glass base material is substantially 6% or less.
    Type: Grant
    Filed: April 5, 2002
    Date of Patent: April 25, 2006
    Assignee: Shin-Etsu Chemical Co., Ltd.
    Inventor: Hiroshi Oyamada
  • Patent number: 7035504
    Abstract: Optical interface units are provided for transmitting data and video signals in a deep fiber network. The optical interface units may include a first type which is situated in a central location, such as at a host digital terminal in a central office location, and a second type which is situated near a subscriber location, such as at an optical network unit. The first type of optical interface unit combines downstream video signals at a first wavelength with downstream data signals at a second wavelength and also receives upstream data signals at the second wavelength. The second type of optical interface unit receives the transmissions from the first type of optical interface unit at the first wavelength and transmits the upstream data signals at the second wavelength. Various embodiments of the optical interface units are provided for extending the functionality of the network to provide high speed data and video on demand services.
    Type: Grant
    Filed: April 27, 2004
    Date of Patent: April 25, 2006
    Assignee: Tellabs Bedford, Inc.
    Inventor: George H. BuAbbud
  • Patent number: 7028508
    Abstract: In the known method for producing an optical fiber, a coaxial arrangement comprising a core rod and an outer jacket tube is elongated, the coaxial arrangement being supplied in a vertical orientation to a heating zone and being softened therein zonewise, starting with the lower end thereof, and the optical fiber being withdraw downwards from the softened portion, whereby an annular gap existing between core rod and jacket tube is collapsed. Starting therefrom, in order to provided a method which makes it possible to produce optical fibers with a minimum curl and at low costs, the invention suggests that a quartz glass cylinder treated mechanically to its final dimension and having an outer diameter of at least 100 mm should be used as the jacket tube. An optical fiber obtained according to the method is characterized in that without the action of external forces it assumes a radius of curvature of at least 6 mm.
    Type: Grant
    Filed: March 6, 2003
    Date of Patent: April 18, 2006
    Assignee: Heraeus Tenevo GmbH
    Inventors: Heinz Fabian, Thomas J. Miller
  • Patent number: 7027685
    Abstract: Apparatus and methods for fiber optic links having a built-in test are disclosed. In one embodiment, an optical component includes a signal source, and a controller operatively coupled to the signal source. The signal source is adapted to output a first combined optical signal having a first optical signal portion of a first frequency and a second optical signal portion of a second frequency. The first frequency is substantially greater than the second frequency. The controller is adapted to induce the signal source to output the first and second optical signal portions, the first optical signal portion being associated with a main communication function and the second optical signal portion being associated with a monitoring function.
    Type: Grant
    Filed: August 20, 2003
    Date of Patent: April 11, 2006
    Assignee: The Boeing Company
    Inventor: Daniel N. Harres
  • Patent number: 7027669
    Abstract: Systems and techniques for generating optical pulses exhibiting a progressive phase shift, and the use of those pulses to transmit data, are described. One embodiment of the invention employs a Mach-Zehnder modulator using electrical signals chosen to introduce a predetermined frequency shift at the center of each pulse generated by the pulse generator. This frequency shift is achieved by introducing a timing difference between the electrical input signals. Another embodiment of the invention employs a chirp free pulse generator and a separate phase modulator to induce the desired frequency or phase shift. These progressively phase shifted pulses may be further modulated to transmit data by introducing phase or amplitude modulation on the optical pulses, depending on the data to be transmitted.
    Type: Grant
    Filed: August 15, 2003
    Date of Patent: April 11, 2006
    Assignee: Lucent Technologies Inc.
    Inventors: Juerg Leuthold, Xiang Liu, Xing Wei
  • Patent number: 7027673
    Abstract: An apparatus and method for splitting a received optical signal into its orthogonal polarizations and sending the two polarizations on separate dual integrated waveguides to other systems on chip for further signal processing. The present invention provides an apparatus and method for facilitating the processing of optical signals in planar waveguides received from optical fibers.
    Type: Grant
    Filed: June 19, 2003
    Date of Patent: April 11, 2006
    Assignee: Luxtera, Inc.
    Inventors: Lawrence C. Gunn, III, Thierry J. Pinguet, Maxime Jean Rattier
  • Patent number: 7024085
    Abstract: Optical systems are disclosed which include one or more components such as an optical multiplexer, an optical demultiplexer, and, an optical amplifier. An optical device is included in the optical system and is configured to communicate with the optical component(s). The optical device includes a substrate proximate to which is disposed a first waveguide array. A second waveguide array is also provided that is disposed proximate the substrate so that a portion of the second waveguide array intersects a portion of the first waveguide array at a predetermined angle, so that a junction is formed. An index of refraction associated with the junction can be varied so that desirable effects can be implemented concerning optical signals transmitted through the waveguides.
    Type: Grant
    Filed: June 3, 2004
    Date of Patent: April 4, 2006
    Assignee: Finisar Corporation
    Inventors: Terry L. Markwardt, Leif G. Fredin, Ray T. Chen, Ram Sivaraman
  • Patent number: 7024093
    Abstract: Provided are methods of forming optical waveguides. The methods involve: (a) forming over a substrate a layer of a photodefinable composition; (b) exposing a portion of the layer to actinic radiation; (c) developing the exposed layer to form a waveguide core structure; and (d) heating the waveguide core structure to a temperature and for a time effective to reflow the structure such that it becomes at least partially rounded in cross-section. Also provided are optical waveguides formed from the described methods and electronic devices including one or more of the optical waveguides.
    Type: Grant
    Filed: December 2, 2003
    Date of Patent: April 4, 2006
    Assignee: Shipley Company, LLC
    Inventors: James G. Shelnut, Matthew L. Moynihan, Omari Patterson
  • Patent number: 7020368
    Abstract: An optical coupling element for use in large numerical aperture collecting and condensing systems. The optical coupling element includes a curved surface such as a lens at the output of a tapered light pipe (TLP). The TLP in combination with the curved surface alters the divergence angle and the area of the light exiting the curved surface. Electromagnetic radiation emitted by a source is collected and focused onto a target by positioning the source of electromagnetic radiation substantially at a first focal point of a primary reflector so that the primary reflector produces rays of radiation reflected from the primary reflector that converge at a second focal point of the secondary reflector. The optical coupling element is positioned so that its input end is substantially proximate with the second focal point of the secondary reflector.
    Type: Grant
    Filed: May 20, 2005
    Date of Patent: March 28, 2006
    Assignee: Wavien, Inc.
    Inventor: Kenneth K. Li
  • Patent number: 7018109
    Abstract: An optical receiver of a bidirectional optical communication module is fabricated through an assembling process in which multiple modules are assembled concurrently. The module includes a first substrate formed with a groove, an optical fiber located in the groove and having a flat surface, a reflective filter inserted between the first substrate and the fiber with a predetermined inclination angle in order to reflect an incident optical signal, a second substrate supporting the fiber and mounted on the first substrate such that the flat surface.
    Type: Grant
    Filed: June 3, 2004
    Date of Patent: March 28, 2006
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Young-Kwon Yoon, Sun-Hyoung Pyo, Hyun-Ho Ryoo, Gi-Tae Mun, Tsumori Masahiko
  • Patent number: 7018112
    Abstract: An optical system with an optical package capable of being assembled in advance. The optical package comprises a body that contains an integrated-circuit chip having an optical sensor on its front face, a ring and an optical device intended to be placed in front of the said optical sensor. Adhesive is deposited on the internal thread (3) of the ring (2) and/or on the external thread (7) of the optical device (5). The optical device (5) is screwed into the ring (2) as far as an entered position. The ring (2), which is provided with the optical device (5), is affixed to the body (12) of the package (11). In order to bring the optical device (5) to an adjustment position relative to the said optical sensor (14), the said adjustment position being away from its entered position, the optical device is unscrewed relative to the ring. A treatment (19) is then applied to the adhesive (10) so as to fix the optical device (5) in the said ring (2) at the adjustment position reached.
    Type: Grant
    Filed: December 18, 2003
    Date of Patent: March 28, 2006
    Assignee: STMicroelectronics S.A.
    Inventor: Olivier Franiatte
  • Patent number: 7016564
    Abstract: An apparatus for switching optical signals, comprising a first group of port cards adapted to receive input optical signals to be switched by the apparatus and a second group of port cards adapted to provide switched optical signals to an entity external to the apparatus. Each of the port cards in the first group includes a plurality of optical transmitter elements operative to produce respective optical beams from the input optical signals, as well as a transmit beam steering element array operative to orient the optical beams into respective transmit directions. Each of the port cards in the second group includes a plurality of optical receive elements operative to detect the presence of respective optical beams received from the port cards in the first group and produce respective ones of the switched optical signals therefrom. Application of beam steering at the port cards in the first group permits the apparatus to be more compact and allows for greater manufacturing tolerances.
    Type: Grant
    Filed: August 26, 2004
    Date of Patent: March 21, 2006
    Assignee: Nortel Networks Limited
    Inventor: Alan Graves