Wavelength Division Patents (Class 398/42)
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Publication number: 20040081462Abstract: An all-optical packet gating and routing system, comprising:Type: ApplicationFiled: October 15, 2003Publication date: April 29, 2004Inventor: Arie Sarah
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Patent number: 6728484Abstract: A method and apparatus for providing channel provisioning in optical wavelength division multiplexing (WDM) networks. The method and apparatus provide a distributed framework to provision channels (i.e., wavelengths) in WDM networks. The method includes managing configuration of underlying lower layer optical devices and processing inter-node and client messages and alarm events. The processing of inter-node messages further includes setting-up bandwidth channels between peer nodes in wavelength division multiplexing networks using a channel request message, the channel request message specifying an associated channel feature set for a requested channel, releasing a preexisting channel using a channel release message and managing a resource update message for distributing network information used for route resolution.Type: GrantFiled: September 7, 1999Date of Patent: April 27, 2004Assignee: Nokia CorporationInventor: Nasir Ghani
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Publication number: 20040076433Abstract: A detector 101 outputs a detection signal indicating amplitude variation of an input frequency-multiplexed signal. An amplitude controller 102 adjusts the amplitude of the frequency-multiplexed signal by referring to the detection signal. A modulator 108 modulates the amplitude-adjusted frequency-multiplexed signal to produce a predetermined modulated signal. A second multiplexer 103 multiplexes the modulated signal and the detection signal to produce a multiplexed signal. An optical transmitter 104 converts the multiplexed signal into an optical signal, and then sends it out to an optical transmission path and the like. An optical receiver 105 converts the optical signal received through the optical transmission path into an electrical signal. A separator 106 separates the modulated signal and the detection signal from the electrical signal. A demodulator 109 demodulates the modulated signal to output the frequency-multiplexed signal.Type: ApplicationFiled: October 9, 2003Publication date: April 22, 2004Inventor: Masaru Fuse
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Publication number: 20040076432Abstract: The present invention offers a coherent light generating device with extremely little Fresnel loss. Additionally, the invention makes anti-reflection coatings on the end surfaces of a wavelength-converting medium unnecessary, while also reducing deterioration of anti-reflection coatings and wavelength-converting medium end surfaces, thereby improving the durability of the device.Type: ApplicationFiled: July 14, 2003Publication date: April 22, 2004Applicant: Cyber Laser, Inc.Inventors: Jun Sakuma, Yuichi Asakawa
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Patent number: 6718139Abstract: An optical fiber ring network includes a plurality of interconnected nodes, each pair of neighboring nodes being interconnected by a pair of optical links. Using coarse wavelength division multiplexing, data is transmitted in both directions over each link, using a first wavelength &lgr;1 to transmit data in a first direction over the link and a second wavelength &lgr;2 to transmit data in a second, opposite direction over the link. The two wavelengths &lgr;1 and &lgr;2 differ by at least 10 nm. Each of the data streams transmitted over the optical link has a bandwidth of at least 2.5 Gbps. Further, each data stream has at least two logical streams embedded therein. A link multiplexer at each node of the network includes one or more link cards for coupling the link multiplexer to client devices, and one or more multiplexer units for coupling the link multiplexer to the optical links.Type: GrantFiled: September 12, 2000Date of Patent: April 6, 2004Assignee: Ciena CorporationInventors: Christopher D. Finan, Mark Farley
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Publication number: 20040047630Abstract: An optical broadband transmission device for the broadband transmission of data streams between a supply node and a user node. The device comprises an optical fiber for the broadband transmission of data streams between the fiber node and the user node, and a first optical transceiver to the supply node and to the first end of the optical fiber. A second transceiver is connected to the user node and to the second end of the optical fiber. The first and second optical transceiver are designed for transmitting and receiving, respectively, data streams on different optical carrier wavelengths via the optical fiber.Type: ApplicationFiled: June 10, 2003Publication date: March 11, 2004Inventors: Robert Furst, Gustav Muller, Olaf Schonfeld
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Patent number: 6704517Abstract: The bidirectional dispersion compensator comprises at least one circulator (Z,Z1,Z2,Z4) and at least one filter-coupler element (F1, etc.). The optical signals (S1,S2) that are emitted in opposite directions are merged and sent to a compensation fiber (LK,LK1, etc.) together, are reflected at the ends of this fiber, and are forwarded in the respective directions of transmission as dispersion-compensated optical signals (SK1 and SK2).Type: GrantFiled: August 9, 2000Date of Patent: March 9, 2004Assignee: Siemens AktiengesellschaftInventor: Ulrich Gaubatz
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Patent number: 6697575Abstract: A method of increasing capacity on a long-haul undersea cable system having at least one optical fiber, said method comprising interleaving counter-propagating forward-propagating and backward-propagating signals in forward and backward channels on a common optical fiber, wherein the wavelength offset between said forward and backward channels is typically half of the channel spacing of co-propagating signals.Type: GrantFiled: June 30, 2000Date of Patent: February 24, 2004Assignee: Tyco Telecommunications (US) Inc.Inventors: Anhui Liang, Chinlon Lin, Bo Pedersen
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Publication number: 20040013427Abstract: [Object] To improve gradation characteristics and realize higher quality in a picture, subfield driving using a pixel provided therein with a memory is disclosed.Type: ApplicationFiled: June 13, 2003Publication date: January 22, 2004Applicant: SEIKO EPSON CORPORATIONInventor: Akihiko Ito
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Publication number: 20040013426Abstract: A wavelength division multiplex (WDM) optical network comprises a ring configuration of optical fiber links (4a-4f) connecting a plurality of nodes (2a-2f) and add (8) and drop (10) filters at each node (2a-2f) connected in series within the ring. One or more of said (8, 10) filters are arranged to add or drop at least two selected adjacent wavelength channels (&lgr;N, &lgr;M) of the WDM optical signal whilst allowing the remainder of the channels within the WDM signal to pass substantially unattenuated. The wavelength channels of each node are selected such as to maximise the number of adjacent wavelength channels at each node.Type: ApplicationFiled: July 16, 2003Publication date: January 22, 2004Inventors: Rosemary Cush, Nigel Wood
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Patent number: 6665476Abstract: One embodiment of the present invention is an exemplary wavelength selective optical coupling device. This exemplary device includes two waveguides, a ring or disc resonator, and resonator coupling elements. The waveguides are disposed on top of a substrate, not in contact with each other. The waveguides may transmit multiple wavelengths of light. The ring or disc resonator includes a dielectric member which extends parallel to the top of the substrate and overlaps, without contacting, the waveguides. The resonator is sized to resonate at a subset of resonant wavelengths. The resonator coupling elements couple the resonator to the substrate. The resonator coupling elements may include a bridge coupled to the top surface of the substrate and electrically coupled to control circuitry within the substrate. A waveguide coupling signal from the control circuitry causes the bridge to deform, translating the resonator up and down, thereby intermittently coupling and decoupling the waveguides.Type: GrantFiled: August 2, 2001Date of Patent: December 16, 2003Assignee: Sarnoff CorporationInventors: Alan Michael Braun, Joseph Hy Abeles, Robert Amantea
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Patent number: 6665460Abstract: A selector assembly to select and deselect signal components from optical signals is disclosed. The selector assembly has an input optical connector for optically connecting an input optical signal carrier to the selector assembly and an output optical connector for optically connecting the selector assembly to an output optical signal carrier. A signal demultiplexer is operatively positioned relative to the input optical connector so that optical signals passing into the selector assembly are demultiplexed by the demultiplexer into signal components, each signal component having a respective signal component beam path. A signal selector is provided in each of the signal component beam paths, each signal selector being switchable by the application of an electric field between at least a selecting state and a deselecting state such that each of the signal components may be either selected or deselected.Type: GrantFiled: February 7, 2002Date of Patent: December 16, 2003Assignee: Photonami Inc.Inventors: Stylianos Derventzis, Steve Hill, Blaine Hobson, Ali Langari, Mike Liwak, Robert B. Thayer
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Publication number: 20030198470Abstract: A WDM assembly comprising a WDM filter structure for multiplexing and demultiplexing optical signals and having a single fibre common connection for transmitting and receiving a WDM optical signal; a housing member for the WDM filter structure; a plurality of E/O transmitter units external to the housing member for receiving a plurality of independent electrical data signals and converting into a plurality of corresponding optical WDM channel signals; plurality of O/E receiver units external to the housing member for receiving a plurality of optical WDM channel signals and converting into a corresponding plurality of independent electrical data signals; wherein each of the E/O transmitter units and O/E receiver units is optically connected to the WDM filter structure via a single fibre link; and wherein excess fibre length in each fibre link is accommodated within the housing member, whereby each fibre length has a predetermined external fibre length between the housing member and the E/O transmitter units anType: ApplicationFiled: April 23, 2002Publication date: October 23, 2003Inventors: Richard Lauder, Chia Seiler, Peter Chart, Brian Robert Brown
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Publication number: 20030180045Abstract: A system and method for bidirectional optical transmission in one optical fiber with large transmission capacity, enabling the enlargement of transmission distance. Downward optical signals sent from one or more downward optical signal transmitters are received by one or more downward optical signal receivers via an optical fiber transmission line and upward/downward signal separating multiplexer—demultiplexers. On the other hand, upward optical signals sent from one or more upward optical signal transmitters are received by one or more upward optical signal receivers by following the opposite route. Output signals from the downward optical signal transmitter leak in the upward optical signal receiver via the upward/downward signal separating multiplexer—demultiplexer.Type: ApplicationFiled: March 12, 2003Publication date: September 25, 2003Applicant: NEC CORPORATIONInventor: Akio Tajima
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Publication number: 20030113121Abstract: The invention relates to a system for conveying digital signals inside a space vehicle between a transmitter and a receiver. In the invention, the link between the transmitter and the receiver comprises a first portion made of optical fiber and a second portion in which infrared radiation propagates without guidance. A particular application lies in conveying remote control and telemetry signals within a satellite between a control module and a piece of equipment.Type: ApplicationFiled: November 26, 2002Publication date: June 19, 2003Applicant: ALCATELInventors: Jean-Didier Gayrard, Michel Sotom, Michel Maignan