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| Number | Title | Issue Date |
| 8417124 | Multiple input, multiple output (MIMO) communication via multimode media Multiple input, multiple output (MIMO) communication systems and a method using multimode media are provided. A MIMO communication system includes an array of emitters that receives a data signal and outputs a plurality of signals (e.g., modulated light, or other si... | 04/09/2013 |
| 8320769 | Transverse-mode multiplexing for optical communication systems An optical communication system having an optical transmitter and an optical receiver optically coupled via a multi-path fiber. The optical transmitter launches, into the multi-path fiber, an optical transverse-mode-multiplexed (TMM) signal having a plurality of ind... | 11/27/2012 |
| 7965944 | System for passive scrambling and unscrambling of an optical signal A system for passively scrambling and unscrambling a, pulse optical signal transmitted through a multi-mode optical fiber is provided. The system includes a scrambling unit connected between a signal receiving end of said transmission fiber and an optical signal sou... | 06/21/2011 |
| 7366421 | Single-to-multi mode converter and optical code division multiple access system using the same A single-to-multi mode converter and an optical code division multiple access system using the same. The mode converter includes first, second, and third optical waveguides. The first optical waveguide is formed of a single-mode optical fiber and outputs a single-mo... | 04/29/2008 |
| 7359580 | Class-AB microwave-photonic link Embodiments of a photonic link having low residual carrier, for use in transmitting information between an electronic signal source and an electronic signal receiver are provided. One exemplary photonic link comprises a transmitter, which has two non-linear threshol... | 04/15/2008 |
| 7310363 | Integrated wavelength tunable single and two-stage all-optical wavelength converter A semiconductor tunable laser (10) and an interferometer (12) coupled to the tunable laser (10) are monolithically fabricated in a semiconductor heterostructure. The laser also comprises a buried ridge stripe waveguide laser. The interferometer ... | 12/18/2007 |
| 7295775 | Method and a system for monitoring the transmission of optical signals The present invention relates to a method of monitoring the transmission of optical signals including a step of inserting a monitoring signal (S) more particularly suited to monitoring the quality of service. During the transmission of optical signals each carried b... | 11/13/2007 |
| 7289698 | High bitrate transport over multimode fibers A multimode fiber system includes a transmitter for transmitting an optical signal and a receiver that receives the optical signal. At least one mode filter is coupled between the receiver and the transmitter and passes only a specific set of fiber modes from the tr... | 10/30/2007 |
| 7286761 | Method of flexible multiple broadcast service delivery over a WDM passive optical network based on RF Block-conversion of RF service bands within wavelength bands A system and method for simultaneous delivery of a plurality of independent blocks of 500 MHz digital broadcast television services, stacking a plurality of RF blocks on a plurality of spectrally sliced WDM optical bands. The method for delivering a plurality of vid... | 10/23/2007 |
| 7269358 | Optical transmitter for increased effective modal bandwidth transmission An optical transmitter for an optical fiber transmission system is described. The optical transmitter includes an optical source that generates an optical signal having a wavelength at an output. An optical intensity modulator modulates the optical signal with an el... | 09/11/2007 |
| 7248762 | Optical fiber transmission system with increased effective modal bandwidth transmission A multi-mode optical fiber link is described. The multi-mode optical fiber link includes a first spatial mode converter that is coupled to a first single mode optical fiber. The first spatial mode converter conditions a modal profile of an optical signal propagating... | 07/24/2007 |
| 7215884 | Optical demultiplexer having bragg diffration grating and optical communication module using the optical demultiplexer An optical demultiplexer having at least one Bragg diffraction grating for minimizing crosstalk on the sides of transmitting and receiving optical signals, as well as an optical communication module using the optical demultiplexer. The optical demultiplexer has firs... | 05/08/2007 |
| 7164858 | Optical transmission system and optical transmitter used therein An optical transmission system is provided with a broadband optical transmitter including a broadband light source and a broadband optical modulator, an optical filter, an optical modulator, a transmission path, a wavelength router, and an optical receiver. The broa... | 01/16/2007 |
| 7127172 | Optical frequency filter The present invention relates to an optical signal shaping device such as an optical filter having a profile such that transmission of light through the device varies as a function of frequency over a selected bandwidth. The optical signal shaping device of the pres... | 10/24/2006 |
| 7085495 | System for flexible multiple broadcast service delivery over a WDM passive optical network based on RF block-conversion of RF service bands within wavelength bands A system and method for simultaneous delivery of a plurality of independent blocks of 500 MHz digital broadcast television services, stacking a plurality of RF blocks on a plurality of spectrally sliced WDM optical bands. The method for delivering a plurality of vid... | 08/01/2006 |
| 7054560 | Configuration for detecting optical signals of a planar optical circuit A configuration for detecting optical signals of at least one optical channel of a planar optical circuit. At least one deflection device is provided, which couples the optical signals of at least one optical channel at least partly out of the plane of the circuit, ... | 05/30/2006 |
| 6914999 | Electro-optic modulators A low loss, low drive voltage plasmon-polariton electro-optic modulator based on mode cutoff comprises a waveguide structure formed by a thin metallic strip surrounded by material having a relatively low free charge carrier density. The metallic strip has finite wid... | 07/05/2005 |
| 6788901 | Method of forming optical radiation beams for free-space optical communication systems The inventive beam forming technique enables use of multimode optical fibers to couple a modulated optical beam from a radiation source to an optical emitting antenna, for free-space communications. The disclosure teaches a methodology for determining the angular an... | 09/07/2004 |
| 6755577 | Optical module A wiring pattern of a circuit board comprises two reference voltage lines holding a signal line therebetween, whereas the reference voltage lines on both ends are electrically connected to a conductive bracket. The bracket covers and electrically shields lead pins c... | 06/29/2004 |
| 6740537 | Process for fabricating a microelectromechanical optical component A process for fabricating a microelectromechanical optical component from a silicon substrate is disclosed. The component comprises optical propagation guides; a wall which can move with respect to the propagation guides; and an electrostatic actuator associated wit... | 05/25/2004 |
| 6728433 | Feedback stabilization of a loss optimized switch A system is provided to obtain loss optimized output optical power by way of feedback control and stabilization in an optical signal switching or routing system. The optical signal switching or routing system includes at least two input optical fibers and at least t... | 04/27/2004 |
| 6609834 | Multimode communications systems A method and apparatus is provided for connecting an optical source to a multimode optical fibre in a multimode optical fibre communications system. A single mode fibre length is provided such that optical radiation admitted from an optical source at one ... | 08/26/2003 |
| 6599038 | Passive remote loop-back method and apparatus for optical circuit verification A passive remote loop-back method and apparatus for optical circuit verification is described. The apparatus may be remotely controlled through either of a dial-up or a data connection. The apparatus is adapted to: perform loop-back of received optical si... | 07/29/2003 |
| 6304352 | Multimode communications systems A method and apparatus is provided for connecting an optical source to a multimode optical fibre in a multimode optical fibre communications system. A single mode fibre length is provided such that optical radiation admitted from an optical source at one ... | 10/16/2001 |
| 5943150 | Massively parallel processor networks with optical express channels An optical method for separating and routing local and express channel data comprises interconnecting the nodes in a network with fiber optic cables. A single fiber optic cable carries both express channel traffic and local channel traffic, e.g., in a mas... | 08/24/1999 |
| 5933553 | Arrangement for transmitting and receiving optical signals An arrangement for the bidirectional transmission and receiving of optical signals. At least one transmitting device and at least one receiving device, and an optical fiber for transmitting the optical signals are described. Provision is made for the at l... | 08/03/1999 |
| 5880864 | Advanced optical fiber communications network An advanced optical fiber communications network comprises a multimode optical fiber connection (one fiber or two) from a central office to an intelligent interface device in the subscriber's premises. The central office includes at least a narrowband swi... | 03/09/1999 |
| 5818630 | Single-mode amplifiers and compressors based on multi-mode fibers To amplify and compress optical pulses in a multi-mode (MM) optical fiber, a single-mode is launched into the MM fiber by matching the modal profile of the fundamental mode of the MM fiber with a diffraction-limited optical mode at the launch end. The fun... | 10/06/1998 |
| 5701187 | Portable input apparatus A portable input apparatus used in conjunction with a controllable information processing apparatus which comprises a light receiving element receiving a base light emitted from a light emitting section of the controllable information processing apparatus... | 12/23/1997 |
| 5659644 | Fiber light source with multimode fiber coupler In an optical fiber light source a section of multimode fiber is interposed between an energizing laser (e.g,, a diode laser) and a single mode fiber active medium. In a preferred embodiment the single mode fiber active medium is surrounded by a multimode... | 08/19/1997 |
| 5608826 | Wavelength division multiplexed optical modulator and multiplexing method using same A method and apparatus for automatically providing for both multiplexing and independent external modulation of two or more wavelengths emitted by one or more multi-longitudinal mode laser(s) or other light source. The present invention uses an integrated... | 03/04/1997 |
| 5600470 | Mixed fiber adapter cable Disclosed is a mixed fiber adapter cable, which is capable of performing direct data transfers from a multi-mode transceiver of a first FDDI node and a single-mode transceiver of a second FDDI node. The mixed fiber adapter cable comprises a multi-mode gra... | 02/04/1997 |
| 5600469 | Optical network unit implemented with low-cost line interface cards In an optical network unit of an optical access network, an optical receiver is connected through a single-mode fiber optic link to a central office for receiving therefrom an ATM cells having a rate in conformance to the transmission capacity of the link... | 02/04/1997 |
| 5485296 | Monitor unit for monitoring an optical waveguide A monitor unit for detecting physical interference of a communications fibre in a transmission system includes a monitor circuit coupled to the communications fibre. A portion of a signal being transmitted along the communications fibre is coupled out of ... | 01/16/1996 |
| 5444563 | Method and arrangement to convert an optical data signal from a multi mode fibre to a corresponding signal into a signal mode fibre The present invention discloses a method and a device for conversion of an optical data signal from a multimode fibre (1), which except for normal data signals may contain interruptions and an overmodulated low frequency signal, to a corresponding signal ... | 08/22/1995 |
| 5349457 | Fiber optic telephone loop network Novel fiber optic telephone loop networks are disclosed. In the networks, single mode fiber optics are used for feeder and distribution segments of the loop but multimode fiber optics are used for the drops. The use of the multimode fiber optics has permi... | 09/20/1994 |
| 5325223 | Fiber optic telephone loop network Novel fiber optic telephone loop networks are disclosed. In the networks, single mode fiber optics are used for feeder and distribution segments of the loop but multimode fiber optics are used for the drops. The use of the multimode fiber optics has permi... | 06/28/1994 |
| 5159481 | Polarization scrambler for polarization-sensitive optical devices A polarization scrambler comprising a multi-mode fiber spirally or preferably toroidally wrapped about a cylinder or toroid. The multi-mode fiber receives an optical signal from a long single-mode fiber. The optical output of the scrambler has an equal di... | 10/27/1992 |
| 5113244 | Fiber optic combiner/splitter The fiber optic combiner/splitter is a positive and negative axicon combination which can convert a ring-shaped beam into a solid beam. The positive half of the axicon is effectively a plano-convex lens where the convex surface is generally a shallow cone... | 05/12/1992 |
| 5077814 | Optical transmission line for use in an optical communication system A mode scrambler is interconnected between a light source and an optical fiber coupler made of a plurality of graded index multi-mode optical fibers. The mode of the input light signals can be converted to a random pattern mode through the mode scrambler,... | 12/31/1991 |
