Attochron, LLC

Other

Thomas Malcolm Chaffee

Wayne Harvey Knox

Taz M Colangelo

Brian M Gregory

Alexander B LeBon

Paul F Szajowski

Alexandre Braga

Isaac Kim

Jean-Claude M Diels

Ralph Bernstein

Karl Stahlkopf

Robert P Fleishauer

The present disclosure provides a free space optical system for optically transmitting processed radio frequency signals through a variably refractive medium. The system may include a transmitting element configured to receive a first signal and process it to generate a time-division combined signal. The transmitting element includes an optical source to generate a beam of light, a modulator to modulate the beam of light based on the time-division combined signal, and an amplifier to amplify the modulated beam of light, which is transmitted through the variably refractive medium. A receiving element includes a photoreceiver to receive the amplified beam of light and extract a second time-division combined signal, a correction unit to correct distortion in the second time-division combined signal, a mixer to multiply the corrected signal with a predetermined frequency signal, an amplifier to amplify the multiplied signal, and an antenna to emit a radio signal generated from the amplified multiplied signal.

Radio frequency signal transmission using free space optical communications

System, method, and instrumentalities are described herein for transmitting information optically. The optical source may be configured to generate a beam. The beam may include a series of light pulses. The beam of light may be modulated. A modulator may be configured to modulate the series of light pulses in response to a data transmission signal, thereby encoding transmission data into the series of light pulses. The modulated beam of light may be received and both amplified and filtered. The filtered beam of light may be transmitted from to a detector having a photoreceiver. The photoreceiver may be configured to extract the transmission data from the filtered beam of light.

Reducing scintillation noise in free-space optical communications

Enhancements in optical beam propagation performance can be realized through the utilization of ultra-short pulse laser (USPL) sources for laser transmit platforms, which are can be used throughout the telecommunication network infrastructure fabric. One or more of the described and illustrated features of USPL free space-optical (USPL-FSO) laser communications can be used in improving optical propagation through the atmosphere, for example by mitigating optical attenuation and scintillation effects, thereby enhancing effective system availability as well as link budget considerations, as evidenced through experimental studies and theoretical calculations between USPL and fog related atmospheric events.

USPL-FSO lasercom point-to-point and point-to-multipoint optical wireless communication

Systems and methods are described for transmitting information optically in free space. For instance, a system may include an optical signal generator to generate an amplified beam of light. A telescope transmits the amplified beam through the medium and receives an inbound beam of light. A detector system may include one or more (or multiple) detectors and a routing system that transmits the inbound beam to a selected set of detectors. In some cases, the system can determine a re-configuration condition based on control parameters and perform a system re-configuration to direct the inbound beam to a different set of detectors. In some cases, the system includes a remote fiber head or wavelength division multiplexing.

Broadband wavelength division multiplexing for free space optical communications

Systems and methods are described for transmitting information optically. For instance, a system may include an optical source configured to generate a beam of light. The system may include at least one modulator configured to encode data on the beam of light to produce an encoded beam of light/encoded plurality of pulses. The system may include a spectrally-equalizing amplifier configured to receive the encoded beam of light/encoded plurality of pulses from the at least one modulator and both amplify and filter the encoded beam of light/encoded plurality of pulses to produce a filtered beam of light/filtered plurality of pulses, thereby spectrally equalizing a gain applied to the encoded beam of light. In some cases, the system may slice the beam of slight, to ensure a detector has impulsive detection. In some cases, the system may include a temperature controller to shift a distribution curve of wavelengths of the optical source.

Temperature control of an optical source in free space optical communications

The present disclosure provides a free space optical communication system comprising a superluminescent light emitting diode (SLED) with an ultrashort coherence length configured to generate a broadband beam of light, a modulator configured to modulate the broadband beam of light to encode data and generate a modulated beam of light, a semiconductor optical amplifier (SOA) configured to amplify the modulated beam of light to generate an amplified beam of light, wherein the SOA has a bandwidth of at least 25, 50, or 100 nanometers, and an output configured to transmit the amplified beam of light through a variably refractive medium. The system enables high-bandwidth optical communication with improved performance in atmospheric turbulence.

Broadband optical system with semiconductor optical amplifier

Free space optical communications using a remote optical head

An optical system for transmitting a beam of light through a variably refractive medium includes an optical source configured to generate a first beam of light, a modulator system, and an amplifier. The modulator system includes a driver configured to generate a driver signal and at least one modulator. The at least one modulator is configured to receive the driver signal and the first beam of light, and time slice and encode data on the first beam of light to generate a second beam of light. An optical spectrum of the first beam of light is matched to a wavelength range of the at least one modulator. The amplifier is configured to amplify the second beam of light to generate a third beam of light. The optical system transmits the third beam of light through a variably refractive medium.

Broadband impulsive coding with amplified spontaneous emission source for free space optical communications

Free space optical communications using a spectrally-equalizing amplifier

Impulsive detection techniques in free space optical communications

The present disclosure provides systems and methods for FSO systems using active feedback noise reduction for light transmitted through a variably refractive medium. A telescope receives an inbound beam of light. A detector system includes a routing system, a noise reduction system, and a first detector. The noise reduction system has a splitter, a second detector, a controller, and a modulator. The second detector generates a sampled signal from a first portion of the inbound beam. The controller generates a control signal based on the sampled signal. The modulator attenuates a second portion of the inbound beam based on the control signal before detection by the first detector, thereby reducing variable noise caused by the variably refractive medium.

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Lexington, VA, United States of America

Thomas Malcolm Chaffee