Abstract: A holographic element (HOE) with multiple apertures formed in a single substrate for use an optical communication system. The multi-aperture HOE can be use instead of an optics unit having one or more separate optical elements for each aperture needed by an optical transmitter, receiver or transceiver. The single substrate reduces complexity and cost relative to conventional system that the use separate optical elements to implement the optics unit.

Abstract: A free space communication system includes first and second terminals, and the first terminal includes a transmitter to transmit an input signal. The transmitter has plural laser sources, at least one optical delay line and a telescope. Each laser source modulates the input signal onto a wavelength that is distinct from a wavelength of each other laser source. The plural laser sources include a first laser source and at least one other laser source, and the at least one optical delay line is coupled to a respective output of the at least one other laser source. The telescope projects an output of the first laser source and an output of each of the at least one optical delay line toward the second terminal. Alternatively, a free space communication system includes first and second terminals, and the first terminal includes a transmitter to transmit an input signal. The transmitter has at least one electrical delay line, plural laser sources and a telescope.

Abstract: Communicating apparatus to be provided between an intermediate line and transmission lines to establish data communications, the intermediate line and the transmission lines having in combination data pass therethrough, the transmission lines including first line and second line, comprises: first receiving means 111 for receiving the data via the first line, second receiving means 121 for receiving the data via the second line, interface means 101 for transmitting via the intermediate line the data received by the first receiving means via the first line and the data received by the second receiving means via the second line, and for receiving the data transmitted by an other communicating apparatus via the intermediate lines, first transmitting means 112 for transmitting via the second line the data transmitted via a first receiving means of the other communicating apparatus, first detecting means 113 for detecting the data transmitted via the second line, first controlling means 114 for controlling the firs

Abstract: It is an exemplary object of the present invention to provide an optical wireless device that easily and stably adjust and fix an optical axis. An inventive optical wireless device includes a communication part for optical communications. and an attachment part for rotatably supporting the communication part and fixing the communication part at a predetermined angle.

Abstract: A point-to-multipoint bi-directional wide area telecommunications network employing atmospheric optical communication. The network comprises a primary transceiver unit, a plurality of subscriber transceiver units and an optical router. The primary transceiver unit may send data destined for the subscriber transceiver units through the optical router, and the subscriber transceiver units may send data destined for the primary transceiver unit through the optical router. The primary transceiver unit and optical router communicate by means of light beams which are transmitted through the atmosphere. Similarly, the optical router and the subscriber transceiver units communicate by means of light beams which are transmitted through the atmosphere.

Abstract: A wake-up circuit for an electronic device comprises an input circuit (1) for receiving infrared signals and an amplifier (2) connected to the input circuit (1), the output of the amplifier being connected to a switching circuit (6) for switching on the device. To improve the signal/noise ratio it is provided that the input circuit (1) includes a parallel arrangement of at least two series arrangements of infrared detectors (7 to 10) as well as a parallel resonant circuit (11), and that the amplifier is a bandpass amplifier (2) the output of which is connected to a signal detector to which the switching circuit (6) is connected.

Abstract: Use of a filter in lieu of a secondary reflector in a reflective telescope provides compact design that eliminates the obstruction caused by the secondary reflector. The filter is selectively reflective to either the angle of incidence of radiation striking the filter or to the polarization exhibited by the radiation. An angularly sensitive filter may be constructed to either a bandpass filter or a short pass filter. A filter that is sensitive to polarization is constructed from a cholesteric liquid crystal. The filter is disposed in front of a primary reflector that comprises an aperture for collecting radiation observed by the telescope.

Abstract: A free space optics communication apparatus which achieves high use efficiency of light and enables free control of the divergent angle of a light beam and the like is disclosed. The free space optics communication apparatus of the present invention has a light source which emits a light beam for performing wireless communication of information, and a minute mirror array unit which consists of a plurality of minute mirrors arranged in a matrix-like form and reflects the light beam emitted from the light source toward another apparatus. The apparatus also has a control unit which controls the directions of the individual minute mirrors constituting the minute mirror array unit independently. The control unit may be used to variably control the number of a plurality of mirror groups formed of a plurality of the minute mirrors in the minute mirror array unit.

Abstract: In a disclosed spatial optical communication apparatus, the optical-axis deviation correction is possible at the same time for both high-speed angular variation with a small amplitude and low-speed angular variation with a large amplitude, and the apparatus has a function of correcting the optical-axis deviation whose application range is wide and whose correction ability is high. To achieve such function, the spatial optical communication apparatus for performing communication between spaced locations with a light beam is provided with both a light deflecting unit set inside an optical system with a narrow variable angle range and a fast response speed, and an optical system driving unit set outside the optical system with a slow response speed and a wide variable angle range.

Abstract: A compact optical instrument called Molecular Optical Air Data System (MOADS) can directly measure wind speed and direction, density, and temperature of a body of air. From these measurements, a complete set of air data products can be determined. In contrast to pitot tubes, however, MOADS can operate at high angles of attack. In the proper configuration, MOADS can continue to measure air data products at angles of attack of 90 degrees. The MOADS instrument is a flush-mount design which lends itself to low observability since there are no aircraft protrusions to generate a radar cross section. MOADS is also airframe independent, and is much less costly to calibrate, recalibrate or service due to this lack of dependence. The system uses a Fabry-Pérot interferometer to detect the (incoherent) Doppler shift from laser light backscattered by air molecules and aerosols (Rayleigh and Mie scattering).

Abstract: An apparatus and method for proactively identifying and initiating corrective actions for restoration of a primary wireless data link during adverse operation conditions. The scheme imparts dynamic adaptability to the wireless link architecture and can ensure overall wireless link availability of better than 99.999%.

Abstract: A method of eliminating the non-linearities associated with the remote feedback sensor, such as a quad position detector, used in a micro-electro-mechanical (MEM) mirror assembly. The incoming beam transmitted from a remote optical wireless link is first polarized, and then a single detector is employed to detect the polarization for the receiver. The single detector eliminates the non-linearity associated with a quad position detector, since the space between the quad detectors is eliminated.

Abstract: A free space optical communication system is disclosed whereby the received power at the receive optical fiber is reduced by adjusting the transmitted light beam and/or the receive optical fiber with respect to each other when a specified power threshold is exceeded. This reduction in received power is achieved by either increasing the cross section of the transmitted beam relative to the receive telescope or, alternatively, moving the receive optical fiber and thereby enlarge the cross section of the received beam incident upon the receive optical fiber.

Abstract: An optical bus system comprising an optical bus is furnished, along two opposed edges, with a plurality of signal light input/output portions for inputting and outputting signal light to and from the bus. Any one of the signal light input/output portions on one edge of the bus inputs signal light thereto and propagates the light to the opposite edge at which another signal light input/output portion outputs the propagated signal light from the bus. The system also comprises a plurality of light emitting/receiving circuits corresponding to the signal light input/output portions. Each light emitting/receiving circuit has a signal light sending unit and a signal light receiving unit. The signal light sending unit generates signal light and sends the generated signal light into the optical bus through the corresponding signal light input/output portion. The signal light receiving unit acquires a received light signal upon receipt of the signal light output by the corresponding signal light input/output portion.

Abstract: A packaging method of the optical transceiver module for transmitting optical signals is disclosed. The invention includes a base, a case, a transmission unit and a receiving unit. The transmission unit and the receiving unit contain a circuit board, respectively. The base provides two fixing positions for the installation of the two circuit boards. The two circuit boards are installed horizontally and vertically, respectively. This design increases the utilization of the inner space, providing ideal shielding for the elements and circuit boards. A central beam is used to fix the structure and case in a drawable way like a matchbox. This reduces covered area of the circuit board, making the elements easy to be tested and assembled.

Abstract: A wireless optical communication system can reduce the power consumption needed for light emission by a controlled node and suppress a modulated signal component, other than the modulated signal of input data for transmission, in the modulated signal components carried by the light output of the controlled node. The controlled node includes a transmission device for transmitting input data for transmission by an infrared ray amplitude-modulated by a modulated signal of a first frequency band and a light emission control device for suspending the light emission by the transmission device for a predetermined period based on a data amount of the input data for transmission. The light emission circuit generates a light emission control signal and the transmission device stops or starts the light emission based on the light emission control signal so that the modulated signal component in the second frequency band other than the first frequency band does not exceed a maximum allowable value.

Abstract: A free space optics communication apparatus is provided which allows flexible setting in accordance with the number or distances of other apparatuses in single-to-multipoint communication.

Abstract: The present invention provides a bilateral communication network system, particularly, a optical wireless communication system communicating information frames via an optical node mounted on a mobile object and a plurality of optical repeaters connected to a wired network, which can prevent transfer performance from deteriorating without increasing frames to be transferred. The optical wireless communication system is constituted as follows. A plurality of the optical repeaters having functions to switch information frames are attached to a ceiling. The optical node bilaterally communicating with the optical repeaters are mounted on a moving object such as a robot, a vehicle or the like. Information frames including address information of the optical node are periodically transmitted from an information processor connected to the optical node via optical wireless communication.

Abstract: There is a described a free space optical signalling system in which data is transmitted from an optical transmitter to an optical receiver. The optical transmitter includes means for modulating one or more light beams in accordance with the data to be transmitted so as to generate a plurality of modulated light beams which are output from the optical transmitter as substantially collimated, spatially-separated, parallel free-space light beams. The optical receiver includes a plurality of detectors, each detector detecting a corresponding one of the plurality of modulated, parallel, free-space light beams and converting the detected light beam into a corresponding electrical signal from which the data can be recovered.

Abstract: The invention solve the problems, such as imperfect connection and transmission error in the connector between the personal computer or other information appliance and the docking unit for its function expansion, and lowering of reliability in the contact portion of the connector by repeated insertion and pulling out, or lowering of reliability in the contact portion due to vibration, salt, or moisture. As the means of solving the problems, a serial signal of USB or IEEE1394 is converted into a signal for optical transmission, and it is transmitted, without making contact, between an emitter 52A and a receiver 52B disposed oppositely across a spatial gap. The transmission routes are prepared in two lines, and full duplex transmission is realized. Therefore, signals are connected and disconnected easily, and anytime, and a highly reliable transmission is realized.