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7403715 |
Free space optical bus
A free space optical bus system and method are provided for connecting two units of circuitry across a free space gap. A first unit of circuitry includes a multiplexer that combines a plurality of...
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7386238 |
Method and system for infrared data communications
A method and system for conveying contextually relevant information to a wireless client are disclosed. More particularly, a transmitter transmits a diffuse infrared signal to a client having an...
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7330661 |
Method and apparatus for optical communication between devices
A method and apparatus for processing a data signal for transmission to a remote device transmits at least two synchronized copies of the data signal, in optical form, in different directions. To...
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7209663 |
Apparatus and method for repeating signal by using wireless optical transmission
A repeating apparatus and method using wireless optical transmission is disclosed. The repeating apparatus includes a donor device for transmitting two identical copies of an optical signal by...
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7127174 |
Hybrid-integrated high-speed OTDM module
A novel optical time division multiplexing (OTDM) module based on hybrid-integrated optical chips is disclosed. An integrated modulator chip generates optical RZ signal streams which are then...
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7116906 |
Wireless optical system for high bandwidth communications
A method for communicating information includes modulating a communications signal by orthogonal frequency domain modulation and transmitting the communication signal by a laser and/or light...
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6934477 |
Method and apparatus for free-space optical communication without eletro-optical conversion
Erbium doped fiber amplifiers (ERDAs) optically couple optical signals between free-space and fiber optic links of a terrestrial optical communication network. The optical gain of transmitting and...
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6907013 |
Network communications link
A wireless communications link between a communication line connector and at least one audio-visual device is provided. The communications link preferably includes a communication line side unit,...
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6778781 |
Health check algorithm for protection circuit in optical network
An optical network has an optical splitter connected to (1) a working optical subscriber unit (OSU) of a working circuit via a working optical fiber, (2) a protection OSU of a protection circuit...
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6771908 |
Fast protection switching by snooping on downstream signals in an optical network
An optical network has an optical splitter connected to (1) a working optical subscriber unit (OSU) of a working circuit, (2) a protection OSU of a protection circuit, and (3) one or more optical...
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6522440 |
Inter-satellite optical link track sensor
The present invention provides a tracking sensor and system to maintain the alignment of an optical communication beam between two terminals. A four-quadrant InGaAs photodetector receives the...
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6057949 |
Bi-directional infrared communications system
An infrared (IR) transmitter modulator/receiver controller (TM/RC) encodes downlink serial digital data and precise time synchronization strobes from a host system to provide a downlink modulated...
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6025946 |
Transmission device and transmission method
The present invention relates to a transmission device and a transmission method which can efficiently perform transmission of audio signals with infrared ray and suppress the complication of data...
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5959752 |
Optical transceiver and optical communications network for both of optical fiber transmission and free space transmission
A cable network is constituted such that interconnectable, passive 4-terminal star couplers are connected to each other via optical fiber cables and a bi-directional optical relay amplifier. Cells...
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5936754 |
Transmission of CDMA signals over an analog optical link
A transmission system for backhauling CDMA signals from remote antennas to the centralized base station of a wireless communication system includes a laser transmitter and an optical receiver...
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5818617 |
Optical data communication and location apparatus, system and method and transmitters and receivers for use therewith
An optical data communication and location apparatus for at least one location in a facility having at least one receiver at said at least one location. A plurality of portable transmitters...
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5585952 |
Communication apparatus automatically selecting one of two operation modes
A communication apparatus includes a memory. The memory stores the protocol of an ASK system and the protocol of an IrDA system. These protocols require predetermined time periods of T1 and T2...
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5444439 |
Data setting system for terminal units in remote supervisory and controlling system employing data transmission
A data setting system for terminal units using an optical wireless signal includes in the respective terminal units a data storing device and a receiving device for the optical wireless signal and,...
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5321542 |
Control method and apparatus for wireless data link
Methods and apparatus for operating an optical communications system having at least two communicating entities (10,12). In accordance with a method of the invention a first step transmits...
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5172113 |
System and method for transmitting data in an optical traffic preemption system
A method of optically transmitting data from an optical emitter to a detector mounted along a traffic route is used in an optical traffic preemption system. The method allows variable data to be...
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5121243 |
Wireless optical communication system utilizing a single optical carrier frequency
A wireless optical short-range communication system adapted for use as an intercom system. The system can be used in fast food restaurants and similar commercial institutions. The communication...
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4959828 |
Multi-channel infrared cableless communication system
A system for simultaneously transmitting a plurality of audio signals into a transmission space from at least one transmission point to one or more reception points. The plurality of audio signals...
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4882770 |
Wireless optical communication system
A wireless optical short-range communication system adapted for use as an intercom system. The system can be used in fast food restaurants and similar commercial institutions. The communication...
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4402090 |
Communication system in which data are transferred between terminal stations and satellite stations by infrared signals
A communication system in which many terminals located in a large room are connected to a host via a plurality of satellites. Data are exchanged between terminals and satellites by infrared...
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4090036 |
Satellite communications system
A satellite communications system provides automatic channel assignment without employing a dedicated signalling channel. A major station detects carrier-free forward channels and transmits on each...
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