Did You Know...
...that one person who claimed to be the inventor of the television is Russian emigre Vladimir Zworykin? In 1929 David Sarnoff, founder of RCA, asked Zworykin what it would take to develop TV for commercial use. He said: a year and a half and $100,000. In reality, it took 20 years and $50 million! Before his death in 1982 at the age of 92, Zworykin said of his invention: "The technique is wonderful. It is beyond my expectations. But the programs! I would never let my children even come close to this thing."
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| Number | Title | Issue Date |
| 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 |
| 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 |
| 7035503 | Optical transmission apparatus Master node #0 and a plurality of slave nodes #1 to #4 are connected to one another via a plurality of optical couplers 20. Each of the nodes is controlled so that signal transmission between the nodes by a bus connection and a link conne... | 04/25/2006 |
| 6909821 | Network for distributing signals to a plurality of users A network for distributing signals to a plurality of user apparatuses having a distribution unit with a plurality of ports, and a plurality of optical-fiber cables connected to the ports and suitable to make the plurality of ports of the distribution unit communicat... | 06/21/2005 |
| 6868237 | Terrestrial optical communication network of integrated fiber and free-space links which requires no electro-optical conversion between links Optical signals are received from a free-space link by directing received light onto a plurality of microlenses and then directing light received through each of the microlenses into a respective single mode optical fiber (SMF). Light beams from the SMFs are combine... | 03/15/2005 |
| 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 |
| 6607311 | Method and system transmitting optical signals generated by multi-line sources via WDM optical network A transmission of optical signals generated by multi-line optical sources is provided via multichannel WDM optical network. Each multi-line optical source generates optical spectral lines within designated spectral range associated with the spectral windo... | 08/19/2003 |
| 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 |
| 5946117 | Optical soliton telecommunication system with dispersion-shifted optical fibre An optical telecommunication system has at least two sources of optical modulated signals at different wavelengths in a predetermined transmission wavelength band, together with a multiplexer for the signals, an optical fibre line connected at one end to ... | 08/31/1999 |
| 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 |
| 5859719 | Photogenerator for lightwave networks The specification describes lightwave systems with remotely powered photoelectric generators. Optical power transmitted through the fiber is incident on a remotely located photodiode array. High power conversion efficiency coupled with a specially designe... | 01/12/1999 |
| 5856881 | Optical fiber transmission line An optical fiber transmission line capable of suppressing the generation efficiency of four wave mixing in transmitting wavelength multiplex signal light. The transmission line employs a single mode optical fiber in which a zero dispersion wavelength is v... | 01/05/1999 |
| 5798853 | Optical communication system compensating for chromatic dispersion and phase conjugate light generator for use therewith An optical communication system compensating for chromatic dispersion and a phase conjugate light generator for use therewith. The system includes an optical transmitter which receives an input signal and transmits signal light over an optical transmissio... | 08/25/1998 |
| 5790292 | Optical fiber transmission line An optical fiber transmission line capable of suppressing the generation efficiency of four wave mixing in transmitting wavelength multiplex signal light. The transmission line employs a single mode optical fiber in which a zero dispersion wavelength is v... | 08/04/1998 |
| 5714773 | Photodiode array for remotely powered lightwave networks The specification describes lightwave systems with remotely powered photoelectric generators. Optical power transmitted through the fiber is incident on a remotely located photodiode array. High power conversion efficiency coupled with a specially designe... | 02/03/1998 |
| 5694114 | Coherent alarm for a secure communication system A high speed secure fiber optic communication system that includes a coherent alarm system utilizes a pair of single mode fiber optic cables in combination with one or more light sources, phase modulators, detectors and polarization scrambling elements to... | 12/02/1997 |
| 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 |
| 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 |
| 5574584 | Wavelength division multiplexing passive optical network with bi-directional optical spectral slicing A passive optical network is provided that spectrally slices optical signals transmitted in both upstream and downstream directions utilizing wavelength division multiplexing routing. The passive optical network preferably includes an incoherent signal so... | 11/12/1996 |
| 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 |
| 5450223 | Optical demultiplexer for optical/RF signals An optical demultiplexer includes an electrooptic modulator (410) which modulates a beam of light (418) in response to frequency-multiplexed radio-frequency (RF) information signals, to produce diverging beamlets of light (420). The diverging beamlets are... | 09/12/1995 |
| 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 |
| 5416861 | Optical synchronous clock distribution network and high-speed signal distribution network An optical waveguide H-tree design is provided for global clock distribution on multichip modules (MCM) which has nearly zero clock skew and is useful for a distributed computer system environment. The optical waveguide H-tree design utilizes channel wave... | 05/16/1995 |
| 5402257 | Method and apparatus for the wireless control of lift devices by infrared transmission In this method and apparatus for the wireless control of a lift device and, in particular, of a traveling crane, a plurality of transmitting units communicate by infrared transmission of data telegrams to a receiving unit associated with the crane. The da... | 03/28/1995 |
| 5361155 | Optical filter tuned by rotation and comprising a Fabry-Perot interferometer A rotation tuned optical filter comprises a Fabry-Perot type interferometer disposed between an optical source and an optical receiver. The interferometer filters an input optical signal from the optical source. The input optical signal propagates substan... | 11/01/1994 |
| 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 |
| 5343322 | System of very-long-distance digital transmission by optical fiber with compensation for distortions at reception A system for very-long-distance transmission of a digital signal between a transmitter station and a receiver station, wherein the transmitter and receiver stations are connected by a monomode optical fiber with negative chromatic dispersion at the operat... | 08/30/1994 |
| 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 |
| 5321541 | Passive optical communication network with broadband upgrade An optical communication network includes at least one single-mode fiber, referred to as a "primary fiber," for transmission between a central office and a distribution node, and at least one multiplicity of single-mode fibers, referred to as "distributio... | 06/14/1994 |
| 5315423 | Wavelength multiplexed two dimensional image transmission through single mode optical fiber An apparatus and method are provided for transmitting two-dimensional images through a single mode optical fiber. Light from a broadband source is dispersed into component wavelengths, spatially modulated to contain an image, collected for multiplexing in... | 05/24/1994 |
| 5311592 | Sagnac interferometer based secure communication system A secure fiber optic communication system capable of tens of gigabits/second data transfer rates that utilizes a pair of single mode fiber optic cables in combination with one or more light sources, phase modulators, detectors and polarization scrambling ... | 05/10/1994 |
| 5278688 | Fault tolerant fiber optic transmission system A fault tolerant fiber optic system has a plurality of lasers modulated by the same signal source. The signals from the lasers are conveyed to an optical coupler by single mode optical fibers. The signals from all of the lasers are mixed in the optical co... | 01/11/1994 |
| 5235452 | Process and switching matrix apparatus for optical transmission of signals by self-heterodyning A process for optical transmission by self-heterodyning and a transmission system with a switching matrix using the process. The process consists in transmitting optical signals to one or more receivers of N, from optical transmission means including an o... | 08/10/1993 |
| 5235453 | Holding unit for a measuring device A holding unit for a measuring device having a base carrying an inductive charging input, and a side wall formed with openings for infrared data transmission, includes a two-step cover surface including an upper cover surface and a lower cover surface, th... | 08/10/1993 |
| 5191458 | Optical electronic multiplexing reflection sensor system An optical electronic multiplexing reflection sensor system for a plurality of Bragg sensors connected in series spaced relation in a plurality of single mode fiber optic cable buses. In each of the buses a unique address is provided each sensor function ... | 03/02/1993 |
| 5189485 | Wavelength meter having single mode fiber optics multiplexed inputs A wavelength meter having a single mode fiber optics input is disclosed. The single mode fiber enables a plurality of laser beams to be multiplexed to form a multiplexed input to the wavelength meter. The wavelength meter can provide a determination of th... | 02/23/1993 |
| 5181264 | Transceiver for bidirectional signal transmission over a monomodal optical fiber A circuit arrangement is provided for allowing the bidirectional exchange of received and transmitted signals over a single monomodal optical fiber. The light transmitter (usually a laser or a LED), the receiver of optical signals and an optical system su... | 01/19/1993 |
| 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 |
| 5128789 | Node for grid type single mode fiber optic local area network A controller at each node of a mesh type grid network of single mode optical fibers implements a switching algorithm which passes a given message to four neighboring nodes only once to avoid flooding the network. If a given wavelength is present on more t... | 07/07/1992 |
| 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 |
