Patents
Sitemap › H04 - Electric communication technique › H04B - Transmission › H04B 10 - Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
Patents for H04B 10 - Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication (73,125)
04/1991
04/02/1991US5004907 Circuit for determining power of received light having superimposition of low frequency current
03/1991
03/29/1991CA2026232A1 Bidirectional light waveguide (lwg) telecommunication system and method for wavelength separation mode (bidirectional wavelength separation mode (wdm) between a central telecommunication location and a plurality of decentralized telecommunication location
03/27/1991EP0419337A1 Digital signal encoding method, encoder and decoder for carrying out the method, regeneration method and regenerator therefore
03/27/1991EP0419216A2 Optical data transmission device with parallel channel paths for arrayed optical elements
03/27/1991EP0419137A2 Dynamically responsive cable television system with shared fibre optic link
03/27/1991EP0419119A2 Optical systems
03/27/1991EP0419029A2 A multiple parallel channel rotary optical coupler
03/27/1991EP0418546A2 Optical mixer
03/27/1991EP0148266B1 Wavelength division multiplexing optical communications systems
03/26/1991US5003626 Dual balanced optical signal receiver
03/26/1991US5003625 Optical heterodyne detection and integrated optical component suitable for use in such a device
03/26/1991US5003624 Automatic bias controller for electro-optic modulator
03/26/1991US5003623 Bimodal intrusion detection in an optical fiber communication system using graded index fiber
03/26/1991US5003546 Interferometric devices for reducing harmonic distortions in laser communication systems
03/26/1991US5002353 Apparatus and method for reducing modulator nonlinearities
03/26/1991CA2025167A1 Method and apparatus for signal multiplexing/demultiplexing
03/22/1991CA2025144A1 Optical systems
03/21/1991WO1991003889A1 Integrated carrier detect circuit
03/21/1991WO1991003888A1 Remote site optical transponder communication and tracking system using a laser aerial
03/21/1991DE3930069A1 Optical signal transmission system using modulated carrier - has ratio of signal magnitude to frequency of above 20 per cent
03/21/1991DE3930067A1 Optical signal transmission system - uses VCO providing modulated carrier fed to PLL at reception side
03/20/1991EP0417548A2 Optoelectronic receiver circuit
03/20/1991EP0417441A1 Double core active-fiber optical amplifier having a wide-band signal wavelength
03/20/1991CA2025483A1 Method for the coding of a digital signal, coder and decoder to implement this method, regeneration method and corresponding regenerator
03/19/1991US5001780 Between teacher and pupil
03/19/1991US5001336 Optical signal summing device
03/19/1991US5000531 Passive bypass for fiber optic ring network
03/14/1991WO1991004617A1 An optical detector
03/14/1991DE3928890A1 Optical waveguide circuit arrangement - has echo compensator between sending electrooptical and receiving optoelectrical transducers
03/13/1991WO1991004530A1 Error detection for fiber distributed interfaced optic link
03/13/1991EP0416986A1 Looping device for half-duplex optical transmission system
03/13/1991EP0416807A2 Optical fibre communication link
03/13/1991EP0416622A2 Predistorter for linearization of electronic and optical signals
03/13/1991EP0416424A2 Apparatus and method for reducing distortion in an analog optical transmission system
03/13/1991EP0222810B1 Optical homodyne detection
03/13/1991CN1049945A Local area network architecture
03/12/1991US4999831 Synchronous quantized subcarrier multiplexer for digital transport of video, voice and data
03/12/1991US4999622 Remote commander having a ROM read-out pre-programmed codes therefrom
03/12/1991CA1281367C Method and device for automatic frequency control of semiconductor lasers
03/07/1991DE3928402A1 Subscriber station with several appts. coupled to current supply - supplies reception signals for optical receiver to current store via changeover switch upon current supply failure
03/07/1991CA2024566A1 Apparatus and method for reducing distortion in an analog optical transmission system
03/06/1991EP0415647A2 Local area network architecture
03/06/1991EP0415645A1 Interferometric devices for reducing harmonic distortions in laser communication systems
03/06/1991EP0415438A2 Optical amplifier and optical communication system provided with the optical amplifier
03/06/1991EP0415407A2 Frequency stabilization of a laser beam by using a birefringent body
03/06/1991EP0415224A2 Arrangement for generating an FSK-modulated optical signal consisting of two orthogonally mutually polarized states from an FSK modulated emitted optical signal
03/06/1991CN1011921B Submarine telecommunication line comprising optical fibers
03/05/1991US4998295 Receiver having an interferometer
03/05/1991US4998294 Opto-electrical power transmission and control system
03/05/1991US4998247 Active star-configured local area network
03/05/1991US4998012 Fiber optic transimpedance receiver
03/05/1991CA1281075C Semiconductor laser modulation control system
03/02/1991WO1991003753A1 Optical coupler
03/01/1991WO1991003886A1 Coupler verification test circuit
03/01/1991CA2065458A1 Coupler verification test circuit
03/01/1991CA2024355A1 Frequency stabilization of a laser beam by using a birefringent body
03/01/1991CA2023469A1 Passive quadrature phase detection system for coherent fiber optic systems
02/1991
02/27/1991EP0414333A2 Optical fibre data network
02/27/1991EP0413948A1 System for optical data transmission, preferably for the automatic payment of road taxes
02/26/1991US4996719 Optical communication apparatus for motor vehicle
02/26/1991US4996683 Optical transmission device
02/26/1991US4996435 Optical system for transmitting data between a stationary part and a rotating part
02/26/1991US4995696 Optical amplifier module
02/26/1991CA1280818C Single-photodiode optical heterodyne mixers
02/21/1991WO1991002416A1 A monitor unit for monitoring an optical waveguide
02/21/1991WO1991002281A1 Modulated retroreflector system
02/21/1991WO1991002222A1 A method of decoding encoded relative spectral data
02/20/1991EP0413123A1 Method of transmitting data over an optical star network, and station and optical star network operating according to the same
02/20/1991EP0151616B1 Control signalling arrangement for a digital transmission system
02/20/1991CN1049434A Double active-fiber optical amplifier having wide-band signal wavelength
02/19/1991US4995101 Secure two-way communications with submerged submarines
02/19/1991US4995100 Amplication of optical signals
02/19/1991US4994675 Method and apparatus for checking continuity of optic transmission
02/19/1991US4993798 Laser arrangement in optical communication system
02/19/1991US4993797 Optical fibre lattice signal processors
02/19/1991CA1280465C Optical backplane
02/13/1991EP0412830A2 Apparatus and method for reduction of intermodulation distortion in an optical fiber network
02/13/1991EP0412727A2 Optical communication system
02/13/1991EP0412717A2 Optical repeated transmission system
02/13/1991EP0412543A2 Polarization control on signal beams for principal-state bidirectional transmission through an optical fiber
02/12/1991US4993032 A feedback control loop
02/12/1991US4992922 Variable high-voltage generating circuit
02/12/1991US4992754 Predistorter for linearization of electronic and optical signals
02/12/1991CA1280170C Homodyne interconnections of integrated circuits
02/06/1991EP0411597A2 Telecommunication system for protected translation of digital signals by means of a passive optical bus network
02/06/1991EP0411566A1 Automatic optical frequency acquisition and tracking apparatus for optical coherent communication system
02/06/1991EP0411562A2 A fast packet and frequency switch
02/06/1991EP0411188A1 Method for supervising the operational state of an electro-optical transmission device, and circuitry for carrying out the method
02/06/1991EP0411131A1 Wavelength stabilized source of light
02/05/1991US4991229 Optical transmitter power measurement and control
02/05/1991US4990990 Monolithically integrated waveguide-photodiode-FET combination
02/05/1991US4989949 Arrangement for discriminating whether or not semiconductor laser is functional
02/05/1991US4989939 Coupler for optical fibers
02/05/1991US4989935 Optoelectronic transmitter and receiver
02/05/1991CA1279914C Binary data regenerator with adaptive threshold level
02/04/1991CA2022424A1 Method and circuit arrangement for monitoring the operating condition of an electro-optical transmission system
01/1991
01/31/1991DE3924186A1 Optical QPSK modulated signal receiver - processes optical signal in electrical part with IF as separation of local and transmitter laser
01/30/1991EP0410860A1 Interface for connecting a computer bus to a fibre-optic ring network
01/30/1991EP0410757A2 Optical transmission system
01/30/1991EP0410712A1 Optical switch
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