Directional Optical Modulation Within An Optical Waveguide Patents (Class 385/4)
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Patent number: 7625136Abstract: An optical module includes a light source, a variable transmittance member disposed on a light path of output light from the light source distant from the light source, and a coupling section for coupling the output light from the light source via the variable transmittance member, wherein coupling efficiency as a ratio between intensity of the light from the light source and intensity of light to be coupled to the coupling section rises in conjunction with a rise in temperature.Type: GrantFiled: December 13, 2007Date of Patent: December 1, 2009Assignee: Seiko Epson CorporationInventors: Akira Miyamae, Kimio Nagasaka
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Patent number: 7626210Abstract: Low profile, side-emitting LEDs are described, where all light is efficiently emitted within a relatively narrow angle generally parallel to the surface of the light-generating active layer. The LEDs enable the creation of very thin backlights for backlighting an LCD. In one embodiment, the LED is a flip chip with the n and p electrodes on the same side of the LED, and the LED is mounted electrode-side down on a submount. A reflector is provided on the top surface of the LED so that light impinging on the reflector is reflected back toward the active layer and eventually exits through a side surface of the LED. A waveguide layer and/or one or more phosphors layers are deposed between the semiconductor layers and the reflector for increasing the side emission area for increased efficiency. Side-emitting LEDs with a thickness of between 0.2-0.4 mm can be created.Type: GrantFiled: June 9, 2006Date of Patent: December 1, 2009Assignee: Philips Lumileds Lighting Company, LLCInventors: Oleg Borisovich Shchekin, Mark Pugh, Gerard Harbers, Michael R. Krames, John E. Epler
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Patent number: 7603003Abstract: This invention provides composite materials comprising nanostructures (e.g., nanowires, branched nanowires, nanotetrapods, nanocrystals, and nanoparticles). Methods and compositions for making such nanocomposites are also provided, as are articles comprising such composites. Waveguides and light concentrators comprising nanostructures (not necessarily as part of a nanocomposite) are additional features of the invention.Type: GrantFiled: September 17, 2008Date of Patent: October 13, 2009Assignee: Nanosys, IncInventors: Mihai A. Bureatea, Stephen A. Empedocles, Chunming Niu, Erik C. Scher
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Patent number: 7596288Abstract: A micro displacement sensor includes a first photonic crystal module, a second photonic crystal module, a light source and a detector. The first photonic crystal module includes a first substrate and a plurality of first photonic crystals, disposed on the first substrate and are arranged in a matrix. The first photonic crystals define a first light-guide channel having a light input end and a light output end. The second photonic crystal module includes a second substrate, disposed parallel to the first substrate, and a plurality of second photonic crystals, disposed on the second substrate and are arranged in a matrix. The second photonic crystals define a second light-guide channel having a light coupling end and a light detected end. The light source is disposed adjacent to the light input end. The detector is disposed adjacent to the light detected end.Type: GrantFiled: December 26, 2007Date of Patent: September 29, 2009Assignees: Tsinghua University, Hon Hai Precision Industry Co., Ltd.Inventors: Zhen-Feng Xu, Guo-Fan Jin
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Patent number: 7585097Abstract: A light pipe is configured to provide a wide effective angle of illumination while simultaneously providing a substantially uniform distribution of light along a length of the light pipe. One or more reflective surfaces not aligned with an inner surface are disposed such that when at least one reflective surface is illuminated, light is emitted from the light pipe at one or more specified angles of light emission. A plurality of reflection points are formed on the inner surface to cause the specified angles when at least one of the reflective surfaces is illuminated. A light pipe is also provided having one or more exterior protrusions configured to function as a secondary light source. A second portion of an outer surface of the light pipe has a radius of curvature which differs from the radius of curvature of the first portion of the outer surface.Type: GrantFiled: March 19, 2006Date of Patent: September 8, 2009Assignee: Tyco Electronics Canada ULCInventors: Kazuhiro Goto, Dragos Luca, Salvatore Alesio
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Patent number: 7583329Abstract: An electro-optical device substrate includes a substrate, a plurality of data lines, a plurality of scanning lines, pixel electrodes, and transistors. The plurality of data lines and the plurality of scanning lines intersect with each other in a display area formed on the substrate. The pixel electrodes are provided at positions corresponding to intersections of the plurality of data lines and the plurality of scanning lines. Each of the transistors includes a semiconductor layer and a gate electrode. The semiconductor layer has a channel region, a data line side source/drain region, a pixel electrode side source/drain region, a first junction region, and a second junction region. The channel region has a channel length along a first direction in the display area. The data line side source/drain region is electrically connected to a corresponding data line. The pixel electrode side source/drain region is electrically connected to a corresponding pixel electrode.Type: GrantFiled: January 24, 2008Date of Patent: September 1, 2009Assignee: Seiko Epson CorporationInventor: Tatsuya Ishii
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Patent number: 7580595Abstract: An optoelectronic data transmission device has an active section with an active element that generates an optical gain if a forward bias is applied, and an absorption section. A waveguide incorporates the active section and the absorption section. Mirrors providing feedback for light are placed to frame the waveguide. The device can be operated in a pulsed regime emitting pulsed laser light. An additional modulator allows modulating its refractive index due to the electrooptic effect. A device providing for the modulation of the refractive index of the modulator. The refractive index of the additional modulator can be varied such that the repetition frequency of the output pulsed laser light is varied. The waveguide further incorporates the additional modulator.Type: GrantFiled: May 9, 2008Date of Patent: August 25, 2009Assignee: Technische Universitaet BerlinInventors: Dieter Bimberg, Nikolai N. Ledentsov, Vitaly Shchukin
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Publication number: 20090208162Abstract: This invention provides a versatile unit cell as well as programmable and reconfigurable optical signal processors (such as optical-domain RF filters) that are constructed from arrays of those unit cells interconnected by optical waveguides. Each unit cell comprises an optical microdisk, an optical phase shifter, and at least one input/output optical waveguide, wherein the microdisk and the phase shifter are both optically connected to a common waveguide.Type: ApplicationFiled: June 1, 2008Publication date: August 20, 2009Applicant: HRL Laboratories, LLCInventor: Daniel Yap
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Patent number: 7577324Abstract: Polarization dependent loss may be reduced by providing at least one dummy waveguide or at least one dummy metal structure. Polarization dependent loss may also be reduced by imposing a mechanical force on the OIC to exert mechanical stress thereby changing at least one of the birefringence and the optical axes of at least one waveguide. And polarization dependent loss may be reduced by forming a metal heater using a first set of metal deposition parameters; forming a conductive metal structure contacting the metal heater using a second set of metal deposition parameters; and selecting the first set of metal deposition parameters and the second set of metal deposition parameters to reduce stress.Type: GrantFiled: July 29, 2008Date of Patent: August 18, 2009Assignee: NeoPhotonics CorporationInventors: Alice Liu, Pamela Shiell Trammel
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Publication number: 20090201698Abstract: An illumination device is specified which has a light source (1) suitable for coupling divergent electromagnetic radiation (6) into an optical waveguide (2), the electromagnetic radiation (6) being guided in the optical waveguide (2) on the basis of total reflection the optical waveguide (2) being suitable for changing a main radiating direction (17) of the electromagnetic radiation (6), and the optical waveguide (2) being formed in one piece. Light-emitting diodes are preferably used as the light source (1). The illumination device is particularly well suited to the backlighting of displays.Type: ApplicationFiled: May 19, 2006Publication date: August 13, 2009Applicant: Osram Opto Semiconductors GmbHInventors: Gunnar Klick, Hulbert Ott, Franz Schellhorn, Mario Wanninger, Georg Bogner
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Patent number: 7559486Abstract: Apparatuses and methods for forming wireless RF labels are claimed. In one embodiment, a flexible layer may be made to receive an array of integrated circuit chips The integrated circuit chips may be powered by a signal from a transmitter which beams the information to the wireless RF labels. The method includes coupling a plurality of integrated circuit chips to a flexible web material and advancing the flexible web material through a web processing apparatus. A metallization material is patterned on the flexible web material. The flexible web material can be coupled to a second web material.Type: GrantFiled: December 18, 2006Date of Patent: July 14, 2009Assignee: Alien Technology CorporationInventor: Jeffrey Jay Jacobsen
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Patent number: 7561760Abstract: An apparatus and a method for steering optical frequency beams using nanowire. A method includes providing one or more nanowire waveguide arrays, generating an optical frequency beam, wherein the optical frequency beam is incident on the one or more nanowire waveguide arrays, controlling the one or more nanowire waveguide arrays to produce a phase delay in the optical frequency beam as it traverses the nanowire waveguide array, wherein the phase delay causes the optical frequency beam to deflect upon exiting the one or more nanowire waveguide arrays, and steering the optical frequency beam exiting the one or more nanowire waveguide arrays by increasing or decreasing the phase delay, wherein the angle of deflection of the exiting optical frequency beam is determined by the amount of phase delay.Type: GrantFiled: July 19, 2006Date of Patent: July 14, 2009Assignee: Northrop Grumman Systems CorporationInventors: Aaron Anthony Pesetski, Silai V. Krishnaswamy
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Patent number: 7555174Abstract: A coplanar waveguide line comprising a substrate; a central electrode strip on the substrate; first and second electrode strips disposed on opposite sides of the central electrode strip and extending parallel thereto; first and second optical waveguides on the substrate, the optical waveguides being positioned between the first and central electrode strips and extending parallel thereto; the central electrode comprising at least one T-rail extending proximate to the first optical waveguide; the first electrode comprising at least one T-rail extending proximate to the second optical waveguide; the substrate comprising an n+ electrically conducting layer extending between the optical waveguides; wherein the coplanar waveguide line further comprises an electrical connection between first and second electrode strips.Type: GrantFiled: October 27, 2004Date of Patent: June 30, 2009Assignee: Filtronic, PLCInventors: Atul Kuver, Yi Zhou
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Patent number: 7555226Abstract: An automatic bias controller for an optical modulator is provided. The automatic bias controller comprises a driver for providing an electrical data signal to the modulator and a bias voltage source for providing a bias voltage to the modulator. A microprocessor provides a low frequency digital modulation signal, which is converted to an analogue modulation signal by a digital to analogue converter. The analogue modulation signal is applied to the bias voltage source (so as to modulate the bias voltage) or to the driver (so as to modulate the amplitude of the data signal). Intensity detectors for detecting the intensity of light emitted by the modulator are provided, and an analogue to digital converter converts the output of the intensity detectors to a digital intensity signal which is passed to the microprocessor. The digital intensity signal is analysed, and the bias voltage source instructed to adjust the bias voltage on the basis of the analysed signal.Type: GrantFiled: July 7, 2005Date of Patent: June 30, 2009Assignee: Bookham Technology plcInventor: Alan Tipper
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Patent number: 7546004Abstract: A photonic interconnect system avoids high capacitance electric interconnects by using optical signals to communicate data between devices. The system can provide massively parallel information output by mapping logical addresses to frequency bands, so that modulation of a selected frequency band can encode information for a specific location corresponding to the logical address. Wavelength-specific directional couplers, modulators, and detectors for the photonic interconnect system can be efficiently fabricated at defects in a photonic bandgap crystal. The interconnect system can be used for both classical and quantum information processing.Type: GrantFiled: January 11, 2008Date of Patent: June 9, 2009Assignee: Hewlett-Packard Development Company, L.P.Inventors: Raymond G. Beausoleil, Philip J. Kuekes, William J. Munro, Timothy P. Spiller, Richard S. Williams, Sean D. Barrett
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Patent number: 7546005Abstract: An optical switch not having waveguide crossings, as in a matrix switch, enabling input/output path switching of N×N, and not increasing the optical loss or the size when the number of channels increases. The optical switch includes plural input ports 10 and plural output ports 17 and has a path switching function of the planar waveguide type. The input ports are connected to one ends of respective different sub-slab optical waveguides 12. The opposite side ends of the sub-slab optical waveguides 12 are optically coupled to one end of a common main slab optical waveguide 15 via arrayed optical waveguides 14. To the opposite side end of the main slab optical waveguide 15 are connected plural output ports 17. On the top of the arrayed optical waveguides 14, there are respectively arranged electrodes 13, each causing the difference in the refractive index of the respective optical waveguide.Type: GrantFiled: October 25, 2005Date of Patent: June 9, 2009Assignee: NEC CorporationInventor: Masashige Ishizaka
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Patent number: 7542631Abstract: An optical transmission system which provides bandwidth restricted optical signal comprises an input terminal (10) for accepting an electrical binary signal, an amplifier (12) for amplifying said electrical binary signal to the level requested for operating an electrical-optical converter (16) such as a Mach Zehnder light modulator, a bandwidth restriction means (14) which is for instance a low pass filter for restricting bandwidth of said electrical binary signal, and an electrical-optical conversion means (16) such as a Mach Zehnder light modulator for converting electrical signal to optical signal. Because of the location of the low pass filter (14) between an output of the amplifier (12) and the Mach Zehnder light modulator (16), the amplifier (12) may operate in saturation region to provide high level output signal enough for operating the Mach Zehnder light modulator, and a signal shaped by the low pass filter (14) is applied to the Mach Zehnder light modulator (16) with excellent waveform.Type: GrantFiled: April 21, 2008Date of Patent: June 2, 2009Assignee: Nippon Telegraph and Telephone CorporationInventors: Kazushige Yonenaga, Yutaka Miyamoto, Akihiko Matsuura
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Patent number: 7539360Abstract: Monitoring a bias point of an optical modulator includes receiving an optical signal modulated by the optical modulator. Photons of the optical signal are received at a photon reactive material operable to produce a reaction in response to the arrival of a predetermined number of photons. Reactions are produced in response to the arrival of the photons of the optical signal. Feedback is generated in response to the reactions. The feedback reflects the waveform of the optical signal, and indicates one or more bias points of the optical modulator.Type: GrantFiled: September 23, 2005Date of Patent: May 26, 2009Assignee: Fujitsu LimitedInventors: Cechan Tian, Takao Naito
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Publication number: 20090129720Abstract: An optical device includes a waveguide immobilized on a base. The device includes a port configured to receive light signals from the waveguide such that the light signals travel through the port. The light signals enter the port traveling in a first direction. The port is configured to change the direction of the light signals from the first direction to a second direction that is toward a location above the device or below the device. The device also includes a wedge configured to receive the light signals from the port such that the light signals travel through the wedge and then exit the wedge traveling in a direction that is at an angle in a range of 88° to 92° relative to the device and that is toward a location above or below the device.Type: ApplicationFiled: July 27, 2007Publication date: May 21, 2009Inventors: Mehdi Asghari, Dazeng Feng, Joan Fong, Daniel C. Lee, Hongbing Lei, Bradley Jonathan Luff
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Patent number: 7535434Abstract: Systems and methods are disclosed for providing a more robust flat panel display by using the Faraday effect to control light emission from a solid state material so as to form two-dimensional or three-dimensional images. Flux tubes can be configured to define a two dimensional array. Each flux tube is somewhat analogous to a single bubble of a magnetic bubble memory and can define a pixel. At least some aspect of light transmitted through a flux tube can be varied thereby, so as to facilitate the formation of an image.Type: GrantFiled: January 25, 2005Date of Patent: May 19, 2009Assignee: The Boeing CompanyInventors: Robert J. Atmur, Jeffrey H. Hunt
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Patent number: 7536066Abstract: In a semiconductor chip module, a transmission optical waveguide device to be mounted in the proximity of the side face of a semiconductor chip on a circuit board includes an input optical waveguide to which light from an external light source is inputted, an output optical waveguide provided at a position displaced in a vertical direction to the surface of the circuit board in a mounted state on the circuit with respect to the input optical waveguide for outputting an optical signal to a different device, an optical path changeover structure for guiding light guided through the input optical waveguide to the output optical waveguide, and an optical modulator provided on the input optical waveguide or the output optical waveguide for modulating light from the external light source based on an electric signal from the semiconductor chip.Type: GrantFiled: January 24, 2008Date of Patent: May 19, 2009Assignee: Fujitsu LimitedInventors: Masayuki Kato, Shigenori Aoki
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Patent number: 7529456Abstract: A photonic crystal may be configured to support a surface state for logic.Type: GrantFiled: September 1, 2006Date of Patent: May 5, 2009Inventors: Roderick A. Hyde, Nathan P. Myhrvold
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Patent number: 7529454Abstract: A photonic crystal may be configured to support a surface state for logic.Type: GrantFiled: March 17, 2006Date of Patent: May 5, 2009Inventors: Roderick A. Hyde, Nathan P. Myhrvold
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Patent number: 7519240Abstract: A wavelength independent multi-section optical coupler having at least three optical couplers, and at least two differential phase cells. Each optical coupler has two waveguides forming a coupling region having a net coupling value. The coupling value for each coupling region of the at least three optical couplers is different than the coupling values of the other two coupling regions. Each differential phase cell connects adjacent ones of said optical couplers. Each differential phase cell causes a differential phase shift in light signals traversing between the optical couplers, wherein the differential phase shifts of the differential phase cells, and the coupling value for each coupling region are chosen so as to minimize wavelength, and fabrication sensitivity of said wavelength independent multi-section optical coupler for a designed power splitting ratio.Type: GrantFiled: July 17, 2007Date of Patent: April 14, 2009Assignee: Infinera CorporationInventors: Brent E. Little, Wei Chen
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Patent number: 7515779Abstract: An optical semiconductor device has a heater, an optical waveguide layer, a first electrode and a second electrode. The heater is provided on a first semiconductor region and has more than one heater segment coupled or separated to each other. The optical waveguide layer is provided in the first semiconductor region and receives heat from the heater. The first electrode is coupled to a connecting point of the heater segments adjacent to each other. The second electrodes are electrically common and are coupled to other ends of the heater segments in opposite side of the connecting point respectively.Type: GrantFiled: March 29, 2007Date of Patent: April 7, 2009Assignee: Eudyna Devices Inc.Inventor: Tsutomu Ishikawa
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Patent number: 7515774Abstract: Single fiber optical telemetry systems and methods are disclosed. The methods and systems facilitate input and output via a single fiber optic interface. The optical telemetry systems and methods also facilitate faster data transmission rates between surface and downhole equipment in oilfield applications.Type: GrantFiled: December 20, 2004Date of Patent: April 7, 2009Assignee: Schlumberger Technology CorporationInventors: Stephane Vannuffelen, Tsutomu Yamate, Bruno Gayral, Soon Seong Chee, Colin Wilson
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Patent number: 7509006Abstract: An optical device wherein an optical waveguide is formed on a dielectric substrate, the optical device includes an input part and an output part where the optical waveguide and corresponding optical fibers are connected. A stress layer is provided for at least one of the input part and the output part. The stress layer applies a stress to the optical waveguide so that an index of refraction of the optical waveguide is reduced.Type: GrantFiled: July 12, 2006Date of Patent: March 24, 2009Assignee: Fujitsu LimitedInventor: Takashi Shiraishi
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Publication number: 20090060527Abstract: The present invention is directed towards systems and methods for adjusting intensity, wavelength and higher and lower frequency components of an optical signal. Photonic apparatus receives a first and a second optical signal. A waveguide provides an anomalous group velocity dispersion the first optical signal or the second optical signal and adjusts intensity or wavelength of the first optical signal or the second optical signal, in response to the anomalous group velocity dispersion. In some embodiments photonic apparatus receives an optical signal comprising a lower frequency component received an amount of time prior to a higher frequency component of the optical signal. A waveguide provides an anomalous group velocity dispersion for the optical signal and adjusts the amount of time between the higher frequency component and the lower frequency component in response to the anomalous group velocity dispersion.Type: ApplicationFiled: March 26, 2008Publication date: March 5, 2009Inventors: Mark Foster, Alexander Gaeta, Michal Lipson, Jay Sharping, Amy Turner
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Patent number: 7499603Abstract: Methods, systems, and devices are provided for an electrooptical modulator. One method embodiment includes receiving an optical input signal to an electrooptical modulator. A first voltage input is applied to a first drive electrode associated with a first optical path in the electrooptical modulator. A second voltage input is applied to a second drive electrode associated with a second optical path in the electrooptical modulator at times alternative to applying the first voltage input to the first drive electrode.Type: GrantFiled: January 19, 2006Date of Patent: March 3, 2009Assignee: Lockheed Martin CorporationInventors: John A. Krawczak, Raymond J. Johnson
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Patent number: 7492976Abstract: This invention provides a flat dispersion frequency discriminator (FDFD) capable of having a substantially flat dispersion with either a positive or negative dispersion along the spectrum region of the discriminator. This way, a FDFD may not cause substantial distortion of the intensity patter of its output to minimize the occurrence distortion due to overshooting or undershooting of the intensity pattern depending on the relative spectral alignment of the laser output relative to the filter transmission.Type: GrantFiled: May 26, 2006Date of Patent: February 17, 2009Assignee: Finisar CorporationInventors: Daniel Mahgerefteh, Duncan John William Walker, Roeland Nuyts
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Patent number: 7489836Abstract: A microchip includes optical layers with integrated waveguides and modulators. A continuous wave light beam coupled to incoming waveguide(s) is modulated and transmitted off-chip by outgoing waveguides coupled to optical interconnects.Type: GrantFiled: March 17, 2003Date of Patent: February 10, 2009Assignee: Intel CorporationInventors: Brandon C. Barnett, Bruce A. Block
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Patent number: 7483642Abstract: A receiver for an OTDM/PDM pulse train (10) in which the pulses (12) have alternating polarizations (P1, P2) has a polarization insensitive optical switch (16; 161, 162, 163, 164) for isolating optical pulses (10?) within the pulse train (10), and a polarization selective element (17) for separating from the isolated pulses (10?) at least one component that has a single polarization. This allows to considerable relax the constraints posed on the switch since components in the isolated pulses that result from interchannel interference can, at least to a large extent, be eliminated by the subsequent polarization selective element (17).Type: GrantFiled: October 31, 2003Date of Patent: January 27, 2009Assignee: AlcatelInventors: Michael Schmidt, Eugen Lach
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Patent number: 7474810Abstract: Apparatuses and methods for modulating electromagnetic radiation are disclosed. A plasmon waveguide including an array of metallic nanoparticles disposed on a dielectric substrate is provided. The plasmon waveguide is disposed on a MEMS structure. An electromagnetic radiation signal is applied to a tapered fiber disposed proximate the MEMS structure. The intensity of the electromagnetic radiation signal passing through the tapered fiber is modified by displacing a deformable member of the MEMS structure to modify a distance between the plasmon waveguide and the tapered fiber such that an evanescent field of the tapered fiber causes a plasmon resonance in the plasmon waveguide.Type: GrantFiled: May 15, 2007Date of Patent: January 6, 2009Assignee: Hewlett-Packard Development Company, L.P.Inventors: Alexandre M. Bratkovski, Shih-Yuan Wang
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Publication number: 20090003784Abstract: A light guiding member having a light direction changing face which extends in a longitudinal direction of the light guiding member and a light emitting face which faces the light guiding member, wherein the light direction changing face includes two faces arranged so that vertical faces which extend in the longitudinal direction and are respectively vertical to the two faces, intersect with each other. Also, a bifurcated linear light source apparatus comprises a LED, a light guiding member which is made up of a transparent rod shape member, and which emits light generated by the LED, in two directions, from a longitudinal direction side face of the transparent rod shape member, and a reflection mirror which reflects the light emitted in one of the two directions, to the other direction of the two directions.Type: ApplicationFiled: August 29, 2008Publication date: January 1, 2009Applicant: USHIO DENKI KABUSHIKI KAISHAInventors: Kiyoyuki Kabuki, Hiroshige Hata, Koichi Kamei
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Patent number: 7471865Abstract: An apparatus and method for an inexpensive, simple to make, self-aligning molded waveguide made of an optically transparent material and that can be used to generate a grid or lamina of light for use with touch screen displays. The molded waveguide substrate includes a plurality of lenses and a plurality of waveguide grooves corresponding to the plurality of integral lenses respectively. After the substrate is molded, the grooves are filled with an optically transparent material to optically couple and align the plurality of lenses and the plurality of grooves respectively. In one application, the molded waveguide substrate is positioned adjacent a touch screen device. A light transmitter and an imaging device are optically coupled to the molded waveguide substrate, and a processing device is coupled to the imaging device.Type: GrantFiled: June 4, 2004Date of Patent: December 30, 2008Assignee: Poa Sana Liquidating TrustInventor: David S. Graham
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Patent number: 7466877Abstract: Monitoring modulation alignment variation of optical modulators includes receiving an optical signal at an input fiber. The optical signal has been modulated by optical modulators. Photons of the optical signal are received at a photon reactive material operable to produce a reaction in response to the arrival of a predetermined number of photons. Reactions are produced in response to the arrival of the photons of the optical signal. Feedback is generated in response to reactions. The feedback reflects the waveform of the optical signal, and indicates modulation alignment variation among the optical modulators.Type: GrantFiled: September 23, 2005Date of Patent: December 16, 2008Assignee: Fujitsu LimitedInventor: Cechan Tian
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Patent number: 7463795Abstract: The present invention relates to an acousto-optic device capable of extending the frequency band of SAWs being able to be generated by it, the acousto-optic device comprising: a light propagation unit for propagating light; a surface acoustic wave propagation unit capable of propagating a surface acoustic wave causing interaction with light which propagates in the light propagation unit; and a transducer electrode unit provided with a plurality of electrodes configured so as to correspond to a frequency band to be generated as the surface acoustic wave which propagates in the surface acoustic wave propagation unit.Type: GrantFiled: November 5, 2004Date of Patent: December 9, 2008Assignee: Fujitsu LimitedInventors: Yukito Tsunoda, Hiroshi Miyata
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Patent number: 7460739Abstract: An optical modulator comprises a Z-cut lithium niobate substrate (21) on which is formed a Mach-Zehnder interferometer having two generally parallel waveguides (23, 25) lying beneath a buffer layer of dielectric material (27). First and second ground electrodes (29, 33) and a hot electrode (31) are disposed on the buffer layer (27), the first and second ground electrodes (29, 33) being spaced either side of the hot electrode (31), the hot electrode (31) and the first ground electrode (29) being proximate to at least apart of the respective waveguides (25, 23). The electrode structure is unsymmetrical in that (a) the hot electrode and the first ground electrode each have a width substantially less than that of the second ground electrode and or (b) the spacing between the first ground and hot electrodes is different from the spacing between the second ground and hot electrodes. whereby a range of chirp values can be obtained.Type: GrantFiled: September 9, 2003Date of Patent: December 2, 2008Assignee: Avanex CorporationInventors: Giovanni Gilardi, Paolo Milanese, Simone Pensa
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Patent number: 7457488Abstract: One embodiment includes a connector for an optical pathway. The connector includes a body formed, at least in part, with a temperature sensitive material having one or more light transmission characteristics that change based upon the temperature of the material.Type: GrantFiled: June 30, 2005Date of Patent: November 25, 2008Assignee: Lockheed Martin CorporationInventors: Rick C. Stevens, Allison Hernandez
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Patent number: 7454091Abstract: Integrated optical network comprising: an array of optical waveguides having respective output ends defining a array of radiating elements, wherein said guides receive respective optical input signals and output said optical signals from said radiating elements to form an optical beam; and actuator means to introduce in said array of guides relative phase differences between said optical signals in order to deflect the optical beam formed; characterized in that the actuator means include at least one actuator track comprising a plurality of track sections substantially aligned with respective optical guides, said sections being fed by a common control signal to locally modify refractive indexes of the respective optical guides in order to introduce said phase differences.Type: GrantFiled: August 5, 2005Date of Patent: November 18, 2008Assignee: STMicroelectronics, S.r.l.Inventors: Guido Chiaretti, Antonio Fincato
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Publication number: 20080279497Abstract: Polarization dependent loss may be reduced by providing at least one dummy waveguide or at least one dummy metal structure. Polarization dependent loss may also be reduced by imposing a mechanical force on the OIC to exert mechanical stress thereby changing at least one of the birefringence and the optical axes of at least one waveguide. And polarization dependent loss may be reduced by forming a metal heater using a first set of metal deposition parameters; forming a conductive metal structure contacting the metal heater using a second set of metal deposition parameters; and selecting the first set of metal deposition parameters and the second set of metal deposition parameters to reduce stress.Type: ApplicationFiled: July 29, 2008Publication date: November 13, 2008Applicant: LIGHTWAVE MICROSYSTEMS CORPORATIONInventors: Alice Liu, Pamela Shiell Trammel
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Patent number: 7447386Abstract: A cascaded modulator system (20) and method for a QKD system (10) is disclosed. The modulator system includes to modulators (M1 and M2) optically coupled in series. A parallel shift register (50) generates two-bit (i.e., binary) voltages (L1, L2). These voltage levels are adjusted by respective voltage adjusters (30-1 and 30-2) to generate weighted voltages (V1, V2) that drive the respective modulators. An electronic delay element (40) that matches the optical delay between modulators provides for modulator timing (gating). The net modulation (MNET) imparted to an optical signal (60) is the sum of the modulations imparted by the modulators. The modulator system provides four possible net modulations based only on binary voltage signals. This makes for faster and more efficient modulation in QKD systems and related optical systems when compared to using quad-level voltage signals to drive a single modulator.Type: GrantFiled: February 23, 2006Date of Patent: November 4, 2008Assignee: Magiq Technologies, IncInventors: J. Howell Mitchell, Jr., Harry Vig, Michael J. LaGasse
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Patent number: 7447389Abstract: An optical modulator includes a signal electrode for application of modulation signals whereby light propagated over an optical waveguide is modulated, and bias electrodes for application of a bias voltage for controlling an operating point for the modulation signals. A buffer layer is provided between a substrate exhibiting electro-optical effect and the bias electrodes, but at regions where no optical waveguide is formed beneath the bias electrodes, no buffer layer is provided, and the bias electrodes are provided directly upon the substrate. This configuration enables bias voltage to be reduced.Type: GrantFiled: January 16, 2007Date of Patent: November 4, 2008Assignee: Fujitsu LimitedInventor: Masaki Sugiyama
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Patent number: 7440643Abstract: A variable light controlling device comprising a substrate, an optical waveguide disposed on the substrate, a first heater and a second heater to change the optical waveguide's temperature is fabricated. And a total amount of the power supplied to the first and the second heater, or a total amount of heat emitted from both of the first and second heater, is maintained substantially constant. Then, the substrate is protected from temperature changes, thereby, stable and quick wavelength tuning operations are realized.Type: GrantFiled: March 2, 2007Date of Patent: October 21, 2008Assignee: NEC CorporationInventor: Hiroyuki Yamazaki
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Patent number: 7437083Abstract: A wavelength converter for binary optical signals includes an interferometer structure (110) for generating an output signal by modulating a received local signal (LS) according to the modulation of a fUrther received first input signal (IS 1). When such interferometer structures (110) are operated in a standard mode it is known in the art to control the power of the input signal such that the extinction ratio of the output signal is kept minimal. The invention also controls the power of the input signals to achieve the minimal extinction ratio when the wavelength converter and in particular the interferometer structure (110) is operated in a differential mode receiving two input signals.Type: GrantFiled: September 10, 2004Date of Patent: October 14, 2008Assignee: ALCATELInventors: Bruno Lavigne, Olivier Leclerc, Jean-Luc Moncelet, Alex Bombrun, Jean-Baptiste Pomet, Fabien Seyfert
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Patent number: 7433549Abstract: A high-speed optical modulator constructed from a number of lower speed intensity modulators integrated onto a single optical chip.Type: GrantFiled: June 30, 2007Date of Patent: October 7, 2008Assignee: Lucent Technologies Inc.Inventors: Christopher Doerr, Peter Winzer
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Patent number: 7430344Abstract: An acousto-optic device is disclosed which can achieve both of suppression of secular change and prevention of device damage and can maintain a stabilized wavelength selection filtering operation. The acousto-optic device includes a substrate on which a SAW guide for guiding a surface acoustic wave and an optical waveguide for guiding an optical wave are provided. A pyro-electricity coping conductive wiring pattern is provided in a region of the substrate other than the SAW guide and neutralizes polarization charge generated on a surface of the substrate.Type: GrantFiled: March 22, 2007Date of Patent: September 30, 2008Assignee: Fujitsu LimitedInventors: Hiroshi Miyata, Yukito Tsunoda, Tadao Nakazawa, Yumi Nakazawa
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Patent number: 7421185Abstract: An optical receiving device includes an optical receiving element and a light collecting portion having an output surface close to or in contact with the optical receiving surface of the optical receiving element. The dispersion plane at an arbitrary point on the line connecting an arbitrary point on an input surface of the light collecting portion to the optical receiving point where light inputted on the arbitrary point on the input surface is received on the optical receiving surface of the optical receiving element is flat, and the normal to the dispersion plane is parallel to the line.Type: GrantFiled: February 7, 2007Date of Patent: September 2, 2008Assignee: Matsushita Electric Industrial Co., Ltd.Inventor: Hidenobu Hamada
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Patent number: 7415172Abstract: Disclosed herein is a diffractive waveguide-spatial optical modulator. The diffractive waveguide-spatial optical modulator includes a substrate member, a plurality of reflecting members, and an actuation means. The reflecting members are each formed in a plate shape, are arranged on the substrate member at regular intervals to form a grating array, are configured to form openings therebetween, and are provided with reflecting surfaces formed on the opposite vertical surfaces of the reflecting members and the bottoms of the openings. The actuation means varies the interval between the reflecting members by actuating the reflecting members. The openings between the reflecting members act as wave guides when light is incident on the open sides thereof, and shift the phase of the incident light and then reflect the incident light, so that the reflected light can form diffracted light, when the interval is varied by the reflecting members.Type: GrantFiled: November 2, 2006Date of Patent: August 19, 2008Assignee: Samsung Electro-Mechanics Co., Ltd.Inventors: Seung Do An, Anatoliy Lapchuk, Victor Yurlov
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Patent number: 7412144Abstract: A waveguide has upper and lower cladding regions. A core of the waveguide made of a non-linear optical polymer is positioned between the upper and lower cladding regions. A first electrode is connected to the upper cladding region and a second electrode is connected to the lower cladding region. The upper cladding region and the lower cladding region are made of photonic band gap materials and have multiple periods of cladding layers with each period having a first layer having a linear refractive index of n1 and each period having a second layer having a linear refractive index of n2. The waveguide allows for minimal distances to exist between the electrodes while allowing for virtual lossless cm-long transmission of propagating light. By applying a voltage to the electrodes, the propagated light can be modulated.Type: GrantFiled: July 22, 2005Date of Patent: August 12, 2008Assignee: The United States of America as represented by the Secretary of the ArmyInventors: Mark J. Bloemer, Michael Scalora, Evgenl Y. Poliakov