摘要:
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. The free space optics communication apparatus has a movable mirror array which has a plurality of mirrors capable of reflecting a light signal from a light source and arranged in a matrix-like form, and a mirror control circuit for controlling the directions of the respective mirrors to form a plurality of mirror groups which reflect the light signal toward the other apparatuses in the movable mirror array. The number of the mirror groups formed in the movable mirror array through the control of the directions of the mirrors by the mirror control circuit is changeable.
摘要:
An apparatus includes a controller for controlling operation of an appliance, an indicator light coupled to the controller to provide a visible indication of an operator selection in response to the controller energizing the indicator light, and a driver coupled to the controller and the indicator light so that the controller may communicate data through the indicator light by controlling the driver. The indicator light may be a light emitting diode or a segment of an alphanumeric display of an appliance control panel. A detector LED may also be coupled to the controller so the controller may receive data from an external device that communicates by flashing light on the detector LED. A terminal for communicating with the appliance may include a detector LED and a conductor that couples the detector LED to a diagnostic tool. The detector LED may receive data from an optical transmitter of the appliance control panel. The terminal may also include a LED that is coupled to the diagnostic tool by a conductor so the LED may be selectively energized by the diagnostic tool to communicate with an optical receiver of the appliance control panel. The detector LED and LED coupled to the diagnostic tool may be located within a housing having apertures for the transmission of visible light to and from the detector LED and LED. The housing may be mounted to the appliance control panel and aligned for communication by means of a magnet or engagement with supports on the appliance control panel.
摘要:
An optical transmitter is provided with: an optical signal generator for generating a main signal to be transmitted and its inversion signal as optical signals of different wavelengths; and a wavelength division multiplexer for wavelength division multiplexing the optical signals of different wavelengths generated by the optical signal generator and transmitting the multiplexed optical signal. By transmitting the main signal to be transmitted and its inversion signal as the wavelength division multiplexed optical signal (containing optical signals of different wavelengths corresponding to the main signal and the inversion signal), nullinter-channel crosstalknull which occurs during multi-wavelength batch amplification by an optical amplifier (Raman amplifier, semiconductor optical amplifier, etc.) can be suppressed effectively, independently of the performance/characteristics of optical devices.
摘要:
An lens for correcting human vision, for example an IOL, contact lens or corneal inlay or onlay, that carries and interior phase or layer comprising a pattern of individual transparent adaptive displacement structures. In one embodiment, the displacement structures are actuated by a shape memory polymer (SMP) material or other polymer that is adjustable in shape in response to applied energy. The SMP can be designed to be selectively adjustable in volumetric dimension, modulus of elasticity and/or permeability. The adaptive optic means of the invention can be used to create highly localized surface corrections in the lens to correct higher order aberrations-which types of surfaces cannot be fabricated into and IOL and then implanted. The system of displacement structures also can provide spherical corrections in the lens.
摘要:
A method and apparatus for transmitting information using the phenomenon of quantum entanglement. Two streams of quantum-entangled particles are emitted from a source. Performing a measurement on one of the streams results in the observable destruction of interference on the other stream. Information is transmitted by modulating the performance of the measurement on the first stream, and received by observing the presence or absence of interference in the second stream.
摘要:
The present invention relates to a node which is used in the structure of an optical communication network. This node has a signal transmission function for performing data transfer and a signal receiving function for performing data signal reception, and includes a unit for establishing and releasing a cut through path to a next stage node. Moreover, it includes a unit for detecting the arrival of a leading packet of burst data, and the unit for establishing and releasing the cut through path includes a unit for establishing a cut through path to the next stage node, when the arrival of a leading packet of burst data is detected by the leading packet arrival detection unit.
摘要:
An optical signaling header technique applicable to optical networks wherein packet routing information is embedded in the same channel or wavelength as the data payload so that both the header and data payload propagate through network elements with the same path and the associated delays. The technique effects survivability and security of the optical networks by encompassing conventional electronic security with an optical security layer by generating replicated versions of the input data payload at the input node, and the transmission of each of the replicated versions over a corresponding one of the plurality of links. Moreover, each of the links is composed of multiple wavelengths to propagate optical signals or optical packets, and each of the replicated versions of the data payload may be propagated over a selected one of the wavelengths in each corresponding one of the plurality of links.
摘要:
A detector is provided for short wave fiber optic communication having compensation to reduce detector jitter. The detector includes a photodetector providing a modulated current. A transimpedance amplifier is coupled to the photodetector receiving the modulated current and providing an output voltage signal. An output buffer is coupled to the transimpedance amplifier receiving the output voltage signal. The output buffer includes a differential transistor pair; a pair of source degeneration resistors connected to the differential transistor pair; and a capacitor coupled between connections of the differential transistor pair and the source degeneration resistors. The value of the capacitor coupled between connections of the differential transistor pair and the source degeneration resistors is selected to reduce jitter. The capacitor passes high slew rate transimpedance amplifier output voltage signals more readily than low slew rate transimpedance amplifier output voltage signals. The effect of the capacitor is to bypass the gain limiting effects of the source degeneration resistors. As a result the differential transistor pair accentuates high slew rates over lower ones so that detector jitter is reduced.
摘要:
A fiber optic transceiver array and a fiber optic transceiver channel are provided for short wave fiber optic communications. A fiber optic transceiver array for short wave fiber optic communications includes a series of fiber optic transceiver channels. Each fiber optic transceiver channel includes a plurality of test pads. A power distribution bypass capacitor is distributed along the series of fiber optic transceiver channels. A plurality of high voltage power supply and ground connections are coupled through the power distribution bypass capacitor and distributed around the series of fiber optic transceiver channels. A threaded high voltage power supply connection is provided to alternating ones of the series of fiber optic transceiver channels. A threaded ground connection is provided to alternating other ones of the series of fiber optic transceiver channels to reduce power noise generation and susceptibility to noise between adjacent channels. A power to ground decoupling capacitor included with each fiber optic transceiver channel also enhances power noise sensitivity reduction. A fiber optic transceiver channel for short wave fiber optic communications includes at least a high voltage power supply connection and a ground connection. A plurality of test pads includes at least a ground connection and a pair of differential output connections. A channel decoupling capacitor is positioned proximate to the pair of differential output connections.
摘要:
An apparatus for detecting cutoff of an optical signal includes an optical power monitoring circuit for producing an output voltage corresponding to power of an input optical signal, a threshold voltage setting circuit for setting a threshold voltage Vth corresponding to the power of the input optical signal so that the threshold voltage Vth is lower than the output voltage produced by the optical power monitoring circuit during receiving the optical signal, the threshold voltage setting circuit having a time constant larger than that of the optical power monitoring circuit, and a comparing circuit for comparing the output voltage produced by the optical power monitoring circuit with the threshold voltage Vth set by the threshold voltage setting circuit and for outputting an optical cutoff alarm signal indicating a cutoff of the optical signal according to a comparison result.