"y" Coupler Patents (Class 385/45)
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Patent number: 7400801Abstract: Embodiments provide single fiber bidirectional HDCP modules. A signal fiber module includes at least one laser and at least one detector and a waveguide combiner/splitter. An optical fiber is used as a cylindrical lens in order to partially collimate in the vertical axis the optical signals entering and leaving branches of a waveguide. The branches of the waveguide have lens-shape interfaces in order to at least partially collimate in the horizontal axis the beams entering and leaving the waveguide. Each branch of the waveguide tapers toward a join-section of the waveguide. At the join section, the cross-section of a laser branch is smaller than the cross-section of a detector branch. If more than one detector is present in a module, the cross-sections of the detector branches differ from each other. If more than one laser is present in a module, the cross-sections of the laser branches differ from each other.Type: GrantFiled: June 19, 2007Date of Patent: July 15, 2008Assignee: Owlink Technology, Inc.Inventors: Xiaolin Tong, Shing-Wu P. Tzeng, Randall Blair, Todd Hu
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Patent number: 7391954Abstract: A compact optical splitter module is disclosed. One type of compact optical splitter module is a planar attenuated splitter module that includes a branching waveguide network having j?1 50:50 splitters that form up to n?2j output waveguides having associated n output ports, wherein only m<n output ports are suitable for transmitting light to the at least one external output device. This provides a 1×m splitter module wherein each output port has the attenuation of a 1×n splitter module, thereby obviating the need for external attenuation. Another type of compact optical splitter module is a direct-connect splitter module that eliminates the need for an optical fiber array when coupling to external optical fibers. Another type of compact optical splitter module is a microsplitter module that serves as device and module at the same time and that eliminates the differentiation between device and module. The integration of device and module also makes manufacturing the microsplitter module cost-effect.Type: GrantFiled: May 30, 2007Date of Patent: June 24, 2008Assignee: Corning Cable Systems LLCInventors: Guy Castonguay, Michael Heath Rasmussen, Konstantinos Saravanos
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Publication number: 20080138014Abstract: A wide passband optical interleaver includes a first optical splitter, having a first output terminal and a second output terminal. A first optical route is coupled to the first output terminal. A second optical route is coupled to the second output terminal. A delay is coupled on the second optical route. A second optical splitter having two input terminals is receiving the first optical route and the second optical route. A plurality of optical filter respectively having transmission coefficients ?i is coupled to the first optical route and the second optical route. The transmission coefficients ?i are determined by satisfying a desired quantity of effective group delay ratio T, defined as T = ? i ? S i ? 1 - ? i 1 + ? i , where ? ? S i ? ? is + 1 ? ? or - 1. where Si is +1 or ?1.Type: ApplicationFiled: December 7, 2006Publication date: June 12, 2008Applicant: INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTEInventors: Shih-Jung Chang, Yin-Chieh Huang, Chi-Yu Ni, Yung-Jui Chen
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Patent number: 7386214Abstract: An optical homogenizing and combining apparatus includes a one piece hollow tubular body having a first and second input legs and an output leg, each leg having a polygonal cross-section and a highly reflective interior surface, the first input leg being configured to receive a first light beam having a first intensity and spectral content that is reflected within the first leg to provide a first leg output beam, the second input leg being configured to receive a second light beam having a second intensity and spectral content that is reflected within the second leg to provide a second leg output beam, the first and second leg output beams being combined and reflected in the third leg to provide an output beam that is a combination of the first intensity and spectral content and the second intensity and spectral content and having a top hat profile.Type: GrantFiled: February 1, 2007Date of Patent: June 10, 2008Assignee: The Boeing CompanyInventor: Frank T. Cianciotto
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Patent number: 7386197Abstract: A method of testing a planar lightwave circuit is achieved by coupling an optical probe to the planar lightwave circuit. In one embodiment, a second probe is used in combination with the first probe to test the planar lightwave circuit by sending and receiving a light beam through the planar lightwave circuit.Type: GrantFiled: November 19, 2004Date of Patent: June 10, 2008Assignee: Intel CorporationInventors: Dmitri E. Nikonov, Mark T. McCormack
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Patent number: 7373025Abstract: In the present invention, for example with regards to a Mach-Zehnder type LN modulator which uses a Z-cut LN substrate, by providing a step by forming an etching part on the surface of the LN substrate, and forming an optical waveguide so as to position a pair of branching waveguides of a Mach-Zehnder interferometer in the step portion, a height difference is produced between the branching waveguides, in the perpendicular direction to the substrate surface. As a result, lines of electric force directed from a signal electrode provided above one branching waveguide towards a ground electrode provided above an other branching waveguide are hardly dispersed, and a desired electro-optic effect can be obtained at a lower drive voltage.Type: GrantFiled: March 1, 2007Date of Patent: May 13, 2008Assignee: Fujitsu LimitedInventor: Yasuhiro Ohmori
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Patent number: 7362933Abstract: In an optical branching unit according to the invention, the cross section shape in an area of a front stage to branch to two output waveguides in the optical branch is a rectangle or a non-circle with different vertical-to-horizontal ratio, including an area that the length along the surface of the substrate is defined to be shorter than the length in the direction orthogonal to the surface of a substrate, the cross section at the output ends of the output waveguide is a rectangle or a non-circle with a different vertical-to-horizontal ratio, where the length along the surface of the substrate is defined to be longer than the length in the direction orthogonal to the surface of the substrate.Type: GrantFiled: November 8, 2006Date of Patent: April 22, 2008Assignee: OMRON CorporationInventors: Fumio Takahashi, Koji Ishikawa, Norihiro Tajima
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Patent number: 7362929Abstract: An optical switch changes over transmission paths of an optical signal by a refractive index change. The optical switch has an optical waveguide layer having an optical waveguide whose output path of an optical signal branches into two, and reflection diffusing ditches which are provided in a portion outside the optical waveguide in the optical waveguide layer, wherein the portion is closed to a branch portion of the optical waveguides. The reflection diffusing ditches extend in a direction crossing a traveling direction of the optical signal.Type: GrantFiled: December 21, 2005Date of Patent: April 22, 2008Assignee: Yokogawa Electric CorporationInventors: Shinji Iio, Masayuki Suehiro, Shinichi Nakajima, Yoshiyuki Asano, Chie Sato, Morio Wada, Akira Miura, Tsuyoshi Yakihara, Shinji Kobayashi, Sadaharu Oka, Mamoru Hihara, Katsuya Ikezawa
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Patent number: 7359598Abstract: Disclosed is a surface plasmon optic device that has a periodic array of apertures in a dielectric substrate and a metal film formed on the dielectric substrate and emits light from metal-air interface. The surface plasmon optic device includes a surface plasmon generating apparatus, a surface plasmon detecting apparatus, a surface plasmon controlling apparatus, an etching apparatus, etc. if a metal diffraction grating is disposed on the metal film having a well-defined interface, propagation of the surface plasmon can be efficiently reflected, divided and controlled. Further, radiating surface plasmon having a half period of a lattice constant formed at air-metal (1, 0) can be preserved at a distance of at least a few micron.Type: GrantFiled: November 10, 2001Date of Patent: April 15, 2008Assignee: Seoul National University Industry FoundationInventors: Dai-Sik Kim, Sung-Chul Hohng, Christoph Lienau, Victor Malyarchuck, Jong-Wan Park, Yeo-Chan Yoon, Han-Youl Ryu, Kyeong-Hwa Yoo
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Patent number: 7356227Abstract: An optical switch, an optical modulator, and a wavelength variable filter each have a simple configuration, which requires only a low driving voltage, which is independent of polarization, and which can operate at high speed. An optical switch includes a 3-dB coupler placed on an output, a 3-dB coupler placed on an output, and two optical waveguides connecting the input-side 3-dB coupler and the output-side 3-dB coupler together. The optical switch also includes a phase modulating section that applies electric fields to one or both of the two optical waveguides. At least two optical waveguides are a crystal material including KTaxNb1-xO3 (0<x<1) and KxLi1-xTayNb1-yO3 (0<x<1, 0<y<1), or KTaxNb1-xO3 or KxLi1-xTayNb1-yO3.Type: GrantFiled: October 4, 2006Date of Patent: April 8, 2008Assignee: Nippon Telegraph and Telephone CorporationInventors: Seiji Toyoda, Kazuo Fujiura, Masahiro Sasaura, Koji Enbutsu, Makoto Shimokozono, Tadayuki Imai, Akiyuki Tate, Touru Matsuura, Takashi Kurihara, Hiroshi Fushimi
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Patent number: 7352934Abstract: An optical cavity structure for bending optical signals is provided. The optical cavity structure includes an input port for receiving input optical signals from a first waveguide. The optical cavity structure also includes an interconnecting structure that receives said input optical signals and interconnects said first waveguide to a second waveguide, the interconnecting structure further includes at least four straight edges that orthogonal and of a finite width. The optical cavity structure further includes an output port coupled to the interconnecting structure for providing the second waveguide with the input optical signals. Further, the optical cavity structure may be used to create three dimensional splitter devices and resonators.Type: GrantFiled: November 28, 2001Date of Patent: April 1, 2008Assignee: Massachusetts Institute of TechnologyInventors: Desmond R. Lim, Christina Manolatou, Paul Maki, Kevin K. Lee, Kazumi Wada, Hermann A. Haus, Lionel C. Kimerling
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Patent number: 7343071Abstract: The invention relates to a method of manufacturing an optical component (800). It also relates to a branching unit and to a method of reducing insertion loss in an optical branching unit. It further relates to a method of reducing stress induced polarization effects in spaced planar waveguides (e.g. couplers) and stress induced tilting of the cores due to strain fields introduced by the top-cladding. It also relates to a method for filling high-aspect-ratio structures with material during reflow. The present invention proposes the use of additional structural elements such as transversal elements (850) connected to or pads (840, 841) or elongate elements located in the vicinity of ordinary waveguide core sections (801, 802). The additional structural elements are typically formed in the same processing step as the ordinary waveguide core sections.Type: GrantFiled: June 4, 2003Date of Patent: March 11, 2008Assignee: Ignis Technologies ASInventor: Christian Laurent-Lund
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Patent number: 7343070Abstract: A 1×2 splitter design having low loss is described. The splitter has a non-adiabatic tapered waveguide (22) connected between a substantially single-mode input waveguide (20) and two output waveguides (24, 26). The non-adiabatic tapered waveguide widens in width towards the output waveguide, and merges substantially continuously with the input waveguide in a direction parallel to the optical axis of the input waveguide. This keeps radiation mode generation to a minimum which, in turn, keeps insertion loss low. In the described embodiment, the non-adiabatic taper shape is based on a perturbed cosine function. The 1×2 splitter can be cascaded with other such splitters in order to build a 1×2N splitter design.Type: GrantFiled: July 11, 2003Date of Patent: March 11, 2008Assignee: Gemfire Europe LimitedInventors: Frederick Marcel Van Der Vliet, Harm Van Weerden
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Patent number: 7340116Abstract: An optical switch, an optical modulator, and a wavelength variable filter each have a simple configuration, which requires only a low driving voltage, which is independent of polarization, and which can operate at high speed. An optical switch includes a 3-dB coupler placed on an output, a 3-dB coupler placed on an output, and two optical waveguides connecting the input-side 3-dB coupler and the output-side 3-dB coupler together. The optical switch also includes a phase modulating section that applies electric fields to one or both of the two optical waveguides. At least two optical waveguides are a crystal material including KTaxNb1-xO3 (0<x<1) and KxLi1-xTayNb1-yO3 (0<x<1, 0<y<1), or KTaxNb1-xO3 or KxLi1-xTayNb1-yO3.Type: GrantFiled: October 4, 2006Date of Patent: March 4, 2008Assignee: Nippon Telegraph and Telephone CorporationInventors: Seiji Toyoda, Kazuo Fujiura, Masahiro Sasaura, Koji Enbutsu, Makoto Shimokozono, Tadayuki Imai, Akiyuki Tate, Touru Matsuura, Takashi Kurihara, Hiroshi Fushimi
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Patent number: 7330620Abstract: A funnel-type planar lightwave circuit (PLC) optical splitter having an input optical waveguide, a slab waveguide receiving the input optical signal from the input optical waveguide, and output waveguides projecting from the slab region. The region connecting the slab waveguide to the output waveguides is characterized by a segmented taper structure. In another additional, or alternative aspect of the present invention, a cladding mode absorption region runs along either or both sides of the input optical waveguide. A funnel-type splitter with both a cladding mode absorption region and a segmented taper structure provides a “super” low loss splitter design, when considering both insertion loss and polarization dependent loss. Advantageously, the disclosed funnel-type PLC splitter does not require a quartz substrate due to its very low PDL, and a silicon substrate can be used. Silicon substrates are known to be lower cost, with a higher resistance to fracture.Type: GrantFiled: February 16, 2007Date of Patent: February 12, 2008Assignee: Aidi CorporationInventors: Kenzo Ishida, Alan Tafapolsky, Takaharu Fujiyama
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Patent number: 7330619Abstract: An optical apparatus comprises: a waveguide substrate; three planar optical waveguides formed on the substrate, each comprising a transmission core and cladding; a laser positioned to launch its optical output to propagate along the first waveguide; a photodetector positioned to receive an optical signal propagating along the second waveguide; and means formed on the substrate for i) transferring a first fraction of laser optical output propagating along the first waveguide to the second waveguide, and ii) transferring a second fraction of the laser optical output propagating along the first waveguide to the third waveguide. The transferring means may comprise: i) a pair of parallel spaced-apart tap core segments; ii) a branched splitter core; or iii) a lateral splitter core.Type: GrantFiled: April 29, 2004Date of Patent: February 12, 2008Assignee: HOYA Corporation USAInventors: David W. Vernooy, Joel S. Paslaski
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Patent number: 7329050Abstract: Disclosed herein are an optical device, such as a connector or mode enlarger, and a method of fabricating the device. The disclosed device includes an optical medium having a first face for, e.g., permanent attachment to a waveguide, a second face for, e.g., a non-permanent connection, and a region between the first and second faces. A non-fiber, connector waveguide is disposed in the region to propagate the single-mode signal from the first face to the second face. The connector waveguide is optically matched to the waveguide at the first face to receive the single-mode signal carried by the waveguide. The connector waveguide includes a taper section such that the connector waveguide is enlarged at the second face to support an expanded beam of the single-mode signal for propagation through the non-permanent connection.Type: GrantFiled: March 10, 2006Date of Patent: February 12, 2008Assignee: Translume, Inc.Inventors: Mark A. Dugan, Ali A. Said, Philippe Bado
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Publication number: 20080031564Abstract: 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: ApplicationFiled: January 16, 2007Publication date: February 7, 2008Applicant: FUJITSU LIMITEDInventor: Masaki Sugiyama
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Publication number: 20070292080Abstract: A variety of structures, methods, systems, and configurations can support plasmons for logic.Type: ApplicationFiled: June 19, 2006Publication date: December 20, 2007Inventors: Roderick A. Hyde, Edward K.Y. Jung, Nathan P. Myhrvold, John Brian Pendry, Clarence T. Tegreene, Lowell L. Wood,
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Patent number: 7310453Abstract: An optical modulator restricted in a photorefractive phenomenon caused by a stray light in an optical modulator, and improved in the quenching ratio characteristics of a signal light. The optical modulator comprises a substrate consisting of a material having an electro-optic effect, an optical waveguide formed on the substrate, and a modulating electrode for allowing an electric field to work on the optical waveguide and changing the phase of light passing through the optical waveguide, characterized in that stray light removing means are provided on the surface of the substrate.Type: GrantFiled: August 29, 2003Date of Patent: December 18, 2007Assignee: Sumitomo Osaka Cement Co., Ltd.Inventors: Junichiro Ichikawa, Masayuki Ichioka, Tokutaka Hara, Yuji Yamane
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Patent number: 7308174Abstract: When a surface of a filter member on a multilayer film is defined as a first surface, a surface of the filter member on an quartz substrate as a second surface, an inner wall surface of a slit which faces the first surface of the filter member as a first inner wall surface, and an inner wall surface of the slit which faces the second surface of the filter member as a second inner wall surface, one or more of the first inner wall surface and the second inner wall surface of the slit, and the second surface of the filter member do not lie parallel to the first surface of the filter member.Type: GrantFiled: June 17, 2005Date of Patent: December 11, 2007Assignee: NGK Insulators, Ltd.Inventors: Masashi Fukuyama, Yasunori Iwasaki, Akiyoshi Ide
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Patent number: 7305163Abstract: Fiber optic phototherapy devices include fiber optic light emitters having fiber optic end portions at one or both ends that may be separated into a plurality of groups of end portions that receive light from one or more light emitting diodes (LEDs). The fiber optic end portions of different segments of the light emitters may also be grouped together in different groups and lighted by different LEDs for selectively lighting any or all of the segments of the light emitters at the same or different types as desired. Lenses may be used to focus the light from one or more LEDs onto the end portions of each group. The LEDs may be mounted to a heat sink to dissipate any excess heat generated by the LEDs.Type: GrantFiled: August 17, 2004Date of Patent: December 4, 2007Assignee: Lumitex, Inc.Inventor: Jeffrey B. Williams
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Patent number: 7302141Abstract: The present invention is concerned with 1×2 thermo-optic digital optical switches known in the art as “Y-branch digital optical switches” and variable optical attenuators.Type: GrantFiled: June 30, 2004Date of Patent: November 27, 2007Assignee: E.I. du Pont de Nemors and CompanyInventor: Louay Eldada
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Patent number: 7302140Abstract: The invention provides an optical switch including a substrate which has conductivity or semiconductivity, an optical waveguide layer which is formed on the substrate, and a control electrode which is formed on the optical waveguide layer. The optical waveguide layer includes an incident-side channel waveguide to which a light signal is incident and plural outgoing-side channel waveguides branched from the incident-side channel waveguide. The control electrode forms a reflection plane reflecting the incident light signal near a crossover portion of the plural outgoing-side channel waveguides by applying voltage to the optical waveguide layer with the substrate to control a refractive index of the optical waveguide layer, and switches propagation paths of the light signal.Type: GrantFiled: April 5, 2006Date of Patent: November 27, 2007Assignee: Keio UniversityInventor: Keiichi Nashimoto
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Patent number: 7289728Abstract: The disclosure is directed toward an optical transmission system comprising a primary path disposed between a first end and a second end. The primary path is configured to transmit optical signals between the first end and the second end. A secondary path is disposed between the first end and the second end. The secondary path is configured to transmit optical signals between the first end and the second end, e.g., in the event of a break in the primary path. A first variable ratio coupler is coupled to the primary path and the secondary path between the first end and the second end. The first variable ratio coupler is configured to adjust a coupling ratio between the primary path and the secondary path.Type: GrantFiled: March 11, 2004Date of Patent: October 30, 2007Assignee: General Instrument CorporationInventors: Shamino Y. Wang, Chandra S. Jasti
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Patent number: 7286733Abstract: A light guide body includes: at least a front end tapered portion including one end connectable to an optical fiber and the other end, the one end being thinner than the other end; a plurality of second taper portions, each including one end connectable to an optical fiber and the other end, the one end of the second taper portion being thinner than the other end of the second taper portion; and a main body connected to the other ends of the first and second taper portions. The front end tapered portion, the main body, and the second taper portions provide transmission of incident light with division between the one end of the front end tapered portion and the one ends of the second taper portions.Type: GrantFiled: June 30, 2005Date of Patent: October 23, 2007Assignee: Fujifilm CorporationInventor: Seiichi Watanabe
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Patent number: 7286731Abstract: A lossless optical coupler includes at least one input waveguide, at least two output waveguides and an intermediate optical splitter. The optical splitter of the present invention further comprises an active section adapted to provide contemporaneous splitting and amplification of an input optical signal. The arrangement of the present invention provides an inexpensive and compact integrateable coupling device.Type: GrantFiled: April 29, 2004Date of Patent: October 23, 2007Assignee: Lucent Technologies Inc.Inventor: Weiguo Yang
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Patent number: 7277613Abstract: An optical multiplexer/demultiplexer is provided with a first member, a second member and an optical filter. The first member is a planar waveguide and is formed with an optical waveguide and another optical waveguide. The second member is a planar waveguide and is formed with an optical waveguide and another optical waveguide. The optical filter is a dielectric multi-layered filter and is sandwiched between the end face of the first member and the end face of the second member.Type: GrantFiled: August 5, 2005Date of Patent: October 2, 2007Assignee: Sumitomo Electric Indutries. Ltd.Inventors: Michiko Takushima, Kenichiro Takahashi, Akira Inoue, Makoto Katayama, Mitsuaki Tamura
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Publication number: 20070217752Abstract: A photonic crystal may be configured to support a surface state for logic.Type: ApplicationFiled: September 1, 2006Publication date: September 20, 2007Inventors: Roderick A. Hyde, Nathan P. Myhrvold
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Publication number: 20070217743Abstract: A photonic crystal may be configured to support a surface state for logic.Type: ApplicationFiled: September 1, 2006Publication date: September 20, 2007Inventors: Roderick A. Hyde, Nathan P. Myhrvold
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Publication number: 20070217731Abstract: A photonic crystal may be configured to support a surface state for logic.Type: ApplicationFiled: September 1, 2006Publication date: September 20, 2007Inventors: Roderick A. Hyde, Nathan P. Myhrvold
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Patent number: 7272276Abstract: An optical performance monitor for measuring the performance of optical networks has an echelle grating for demultiplexing an input beam into a plurality of wavelengths that are focused onto an array of divided output waveguides. Each divided output waveguide is positioned to receive a corresponding demultiplexed wavelength from the echelle grating or other waveguide multiplexer device. The divided output waveguides laterally separate the corresponding demultiplexed wavelength into a first and second portions. A detector array is positioned to receive the respective portions of the demultiplexed wavelengths and by comparing their relative intensity it is possible to detect any drift in the nominal wavelengths of the channels.Type: GrantFiled: November 8, 2001Date of Patent: September 18, 2007Assignee: Enablence Inc.Inventors: Matt Pearson, Lynden Erickson, John Miller, Siegfried Janz, Dan-Xia Xu, Pavel Cheben, Andre Delage, Boris Lamontagne, Sylvain Charbonneau
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Patent number: 7272279Abstract: A waveguide type optical branching device having: two input ports; two output ports; optical waveguides extending from the input ports and the output ports respectively; and a coupling portion formed allowing the optical waveguides from the input ports and the output ports to gradually approach each other in a direction toward the output ports. The device is operable such that, in a direction from the input ports to an output end of the coupling portion, when light is inputted to one input port of the two input ports, an even more is predominantly excited, and when light is inputted to the other input port of the two input ports, an odd mode is predominantly excited. The optical waveguides in the coupling portion have a core width that is larger at a middle position in a height direction thereof than at an upper surface of the core.Type: GrantFiled: October 16, 2006Date of Patent: September 18, 2007Assignee: Hitachi Cable, Ltd.Inventors: Hiroshi Ishikawa, Tomoyuki Hakuta
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Patent number: 7260295Abstract: An optical transmitting and receiving module for an optical waveguide performs both a transmitting operation and a receiving operation simultaneously. The linear first waveguide is provided such that one side is coupled to an optical fiber and the other side is coupled to a light receiving element. A second waveguide is coupled so as to meet and make an acute angle with the first waveguide. The second waveguide is shaped with a tapered portion adjacent to the first waveguide.Type: GrantFiled: January 29, 2004Date of Patent: August 21, 2007Assignee: Sony CorporationInventors: Takahiro Arakida, Kenji Suzuki
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Patent number: 7231105Abstract: 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: GrantFiled: March 17, 2006Date of Patent: June 12, 2007Assignee: Luxtera, Inc.Inventors: Lawrence C. Gunn, III, Thierry J. Pinguet, Maxime Jean Rattier
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Patent number: 7228023Abstract: An optical isolator is disclosed. An apparatus according to aspects of the present invention includes a Mach-Zehnder Interferometer (MZI) disposed in semiconductor material. The MZI has first and second arms. An optical beam is to propagate through the MZI in a forward direction. The apparatus further includes first and second optical modulators disposed in the first and second arms, respectively, of the MZI. The first and second optical modulators have traveling wave electrodes, which are coupled to receive first and second traveling wave signals, respectively. The first and second traveling wave signals are to generate traveling waves in the MZI that propagate in a reverse direction opposite to the forward direction.Type: GrantFiled: December 30, 2005Date of Patent: June 5, 2007Assignee: Intel CorporationInventor: Richard Jones
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Patent number: 7215846Abstract: A mode coupler structure includes a discriminating structure that discriminates between various incoming modes from an input optical fiber structure. A waveguide structure is coupled to the discriminating structure that couples light not discriminated by the discriminating structure to an output optical fiber structure.Type: GrantFiled: November 15, 2004Date of Patent: May 8, 2007Assignee: Analog Devices, Inc.Inventor: Shrenik Deliwala
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Patent number: 7206475Abstract: In an optical switching apparatus having redundantly-arranged optical switches, a route switching operation mode, an autonomic redundant switching operation mode and a compulsory redundant switching operation mode are discriminated from one another so that these operation modes are prevented from being executed at the same time, and also proper mask processing is performed at every switching operation mode. Therefore, emission of an undesired alarm and thus occurrence of malfunction when each switching operation is carried out can be prevented.Type: GrantFiled: September 20, 2004Date of Patent: April 17, 2007Assignee: Hitachi, Ltd.Inventors: Sunao Kakizaki, Hideaki Tsushima, Shigeki Kitajima, Yasuyuki Fukashiro, Takashi Mori
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Patent number: 7181110Abstract: An apparatus and method for combining light signals carried on a plurality of input fibers onto a single receiving fiber with a high degree of efficiency. The apparatus broadly comprises the receiving fiber and a plurality of input fiber-lens assemblies, with each fiber lens assembly including an input fiber; a collimating lens interposed between the input fiber and the receiving fiber and adapted to collimate the light signal; and a focusing lens interposed between the collimating lens and the receiving fiber and adapted to focus the collimated light signal onto the face of the receiving fiber. The components of each fiber-lens assembly are oriented along an optic axis that is inclined relative to the receiving fiber, with the inclination angle depending at least in part on the input fiber's numerical aperture and the focal lengths and diameters of the collimating and focusing lenses.Type: GrantFiled: December 30, 2005Date of Patent: February 20, 2007Assignee: Honeywell Federal Manufacturing & Technologies, LLCInventor: Paul Edward Klingsporn
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Patent number: 7167607Abstract: A symmetric optical modulator with low driving voltage, wherein polarization of any one of branched waveguides formed on a substrate is inverted, and the two branched waveguides are simultaneously controlled by a center electrode formed on a top portion thereof, thereby ensuring a low voltage driving and embodying a characteristic of there being no signal distortion due to chirp.Type: GrantFiled: July 18, 2005Date of Patent: January 23, 2007Assignee: Korea Electronics Technology InstituteInventors: Woo Kyung Kim, Woo Seok Yang, Han Young Lee
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Patent number: 7149390Abstract: A device such as an integrated display device and projector apparatus using said display device for projecting an image on a screen comprises a number of light sources, waveguides, optical switches, micro-lenses and scanning mirrors. The display apparatus consists of said display device, a modulator circuit, an optical switch controller, a scanning mirror controller, a synchronizer and projection optics. This device enables the projector apparatus to be extremely small and to reduce its power consumption in comparison with conventional projectors.Type: GrantFiled: August 25, 2004Date of Patent: December 12, 2006Assignee: Sony CorporationInventor: Takehisa Ishida
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Patent number: 7130518Abstract: An optical coupler, a beam splitter, and an AWG, according to the present invention are each provided with a transition region for the attainment of a low loss and can effectively prevent the reflection of optical signals which occurs in the transition region. The optical coupler, beam splitter, and AWG, according to the present invention are each provided with a slab waveguide 55, plural waveguides 621, 622, . . . , 6210 for the output of optical signals and further provided with plural waveguide paths 63 for connecting adjacent ones of the waveguides 621, 622, . . . , 6210. The waveguide paths 63 adjacent with respect to each of the waveguides are positioned at different distances from the slab waveguide 55.Type: GrantFiled: December 15, 2004Date of Patent: October 31, 2006Assignee: NEC CorporationInventor: Hiroyuki Yamazaki
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Patent number: 7130504Abstract: An optical demultiplexing device used in an optical monitoring device includes an input port and an output port unit including a plurality of ports, and separates a WDM light of plural channels, which is input from the input port, for each wavelength to output to the output port unit. The output port unit includes a plurality of output port sets each of which includes at least two individual output ports as a set, and crosstalk between adjacent individual output ports in a single output port set is larger than crosstalk between adjacent individual output ports belonging to different output port sets.Type: GrantFiled: July 29, 2005Date of Patent: October 31, 2006Assignee: Fujitsu LimitedInventor: Haruhiko Tabuchi
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Patent number: 7123789Abstract: An optical wavelenth selective filter on an optical waveguide and a method of making the same is provided. The filter is able to transmit a first predetermined band of wavelengths and to reflect a second predetermined band. The filter further includes a plurality of transmissive couples and reflective couples in series, with each of the couples including a first zone of high refractive index and a second zone of low refractive index adjacent to each other so as to form a structure with a high gap modulated refractive index.Type: GrantFiled: October 26, 2001Date of Patent: October 17, 2006Assignee: Pirelli & C. S.p.A.Inventors: Giacomo Gorni, Maurizio Tormen, Marco Romagnoli, Matteo Cherchi
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Patent number: 7116867Abstract: Disclosed is a multiple split optical waveguide in which a branch waveguide path at an output end of a branch part of a first stage defines an acute angle with respect to an input waveguide path, and a branch waveguide path at an input end of a branch part of an n-th stage is no more inclined toward a central axial line defined by an extension line of the input waveguide path than a branch waveguide path at an input end of a branch part of an (n+1)-th stage, n being an integer equal to or greater than two. Thus, the waveguide paths are prevented from spreading beyond the first branch angle, and it becomes easier to bring the outer waveguide guide paths back toward the center. This prevents an increase in the variations in length between the outer and inner waveguide paths.Type: GrantFiled: April 12, 2002Date of Patent: October 3, 2006Assignee: NHK Spring Co., Ltd.Inventor: Fumio Takahashi
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Patent number: 7116868Abstract: An optical branch device, comprising: a branch portion having a first branch waveguide extended linearly and continuously from a waveguide in a basis portion, and second and third branch waveguides extended in the directions farther from the first branch waveguide in such a manner that the first branch waveguide is interposed between the second and third branch waveguides; a parallel portion in which the second and third branch waveguides are positioned in parallel to the first branch waveguide; and a divergent portion in which the second and third branch waveguides are extended gradually farther from the first branch waveguide; wherein the interval pitch P (?m), in the transverse direction, between the first, second and third branch waveguides in the parallel portion and the refractive index difference (?n) between the core and the clad are set in such a manner that C satisfies a relationship of C=0.5±0.2 wherein C is calculated by substituting P and ?n for an equation of C=?n×P2.Type: GrantFiled: September 8, 2005Date of Patent: October 3, 2006Assignee: Sanyo Electric Co., Ltd.Inventors: Nobuhiko Hayashi, Mitsuaki Matsumoto, Keiichi Kuramoto, Hitoshi Hirano
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Patent number: 7113676Abstract: A planar optical isolator is formed within the silicon surface layer of an SOI structure. A forward-directed signal is applied to an input waveguiding section of the isolator and thereafter propagates through a non-reciprocal waveguide coupling region into an output waveguide section. A rearward-directed signal enters via the output waveguide section and is thereafter coupled into the non-reciprocal waveguide structure, where the geometry of the structure functions to couple only a small amount of the reflected signal into the input waveguide section. In one embodiment, the non-reciprocal structure comprises an N-way directional coupler (with one output waveguide, one input waveguide and N?1 isolating waveguides).Type: GrantFiled: December 6, 2004Date of Patent: September 26, 2006Inventors: David Piede, Margaret Ghiron, Prakash Gothoskar, Robert Keith Montgomery, Vipulkumar Patel, Kalpendu Shastri, Soham Pathak, Katherine A. Yanushefski, Harvey Wagner
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Patent number: 7110429Abstract: A distributed feedback laser comprising a guide layer is disclosed and includes a plurality of waveguides connected in a stepped multi-branch structure, the guide layer serving as a transmission medium for light having a predetermined wavelength, and an active layer, formed on the guide layer, for oscillating light, wherein light is branched according to a predetermined ratio while proceeding from a higher waveguide to a lower waveguide within the guide layer.Type: GrantFiled: July 28, 2003Date of Patent: September 19, 2006Assignee: Samsung Electronics Co., Ltd.Inventor: Joon-Sang Yu
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Patent number: 7099539Abstract: An optical system and associated method are provided. Included is a first branch capable of allowing light to pass therethrough in a forward direction and a reverse direction. The first branch includes a first medium with a first refractive index (n1), and a first end and a second end. Also included is a second branch capable of allowing light to pass therethrough in the forward direction. The second branch includes a second medium with a second refractive index (n2, with n2<n1), and a first end and a second end. The second end of the second branch is further coupled to the first branch to form an angle (?2). In use, ?1?sin?1(n2/n1) in order to prevent the light passing through the first branch in the reverse direction from passing into the second branch, where ?1 is the incident angle of the light passing in the reverse direction from the first branch to the second branch.Type: GrantFiled: July 7, 2003Date of Patent: August 29, 2006Assignee: Super Talent Electronics, Inc.Inventors: Chi Au, Tzu-Yih Chu, Hao Yin, Abraham C. Ma, Edward W. Lee
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Patent number: 7088875Abstract: An object of the invention is to provide a Mach-Zehnder type optical modulator that can reduce wavelength chirp occurring in a modulated light, and also can reduce an optical loss with a small sized configuration. To this end, according to the present Mach-Zehnder type optical modulator, in a configuration where optical waveguides and a coplanar electrode are formed on a substrate having an electro-optical effect, a polarization inversed region is formed in a part of an interaction portion of the substrate, and a signal electrode is arranged above one of parallel waveguides in a polarization inversed region and is arranged above the other parallel waveguide in a non-inversed region. Furthermore, a surface area of the substrate positioned on both sides of each of the parallel waveguides is lowered to provide a ridge structure section, and a buffer layer is formed on a ridge side face thereof.Type: GrantFiled: June 22, 2004Date of Patent: August 8, 2006Assignee: Fujitsu LimitedInventors: Masaki Sugiyama, Yumi Nakazawa, legal representative, Tadao Nakazawa, deceased