Free space optics coherent receiver architecture using optical injection locking
AssigneeGeneral Dynamics Mission Systems, Inc.
InventorsJuan C. Juarez, Claudia Ann Gamble, Matthew L. Heston
Life of this patent
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Abstract
A method for controlling a free space optical receiver including receiving an optical signal including a digital information by an optical terminal, detecting a phase and an amplitude of the optical signal, generating an optical local oscillator signal in response to the phase and amplitude, extracting an optical baseband signal in response to a superposition of the optical signal and the optical local oscillator signal, converting, by a photodiode, the optical baseband signal into a digital baseband signal, and extracting, by a digital signal processor, the digital information from the digital baseband signal.
Claims20
A method for controlling a free space optical receiver comprising:
- receiving an optical signal including a digital information by an optical terminal;
- detecting, by a first photodiode, a phase and a frequency of the optical signal;
- generating, by a laser diode, an optical local oscillator signal in response to the phase and the frequency;
- extracting, by a quadrature optical hybrid, an optical baseband signal in response to a superposition of the optical signal and the optical local oscillator signal;
- converting, by a second photodiode, the optical baseband signal into a digital baseband signal;
- and
- extracting, by a digital signal processor, the digital information from the digital baseband signal.
A free space optical receiver comprising:
- an optical terminal configured for receiving an optical signal including a digital information;
- a photodetector configured for detecting a phase and a frequency of the optical signal;
- a laser diode configured for generating an optical local oscillator signal in response to the phase and the frequency;
- a quadrature optical hybrid configured for extracting an optical baseband signal in response to a superposition of the optical signal and the optical local oscillator signal;
- converting, by a photodiode, the optical baseband signal into a digital baseband signal;
- and
- extracting, by a digital signal processor, the digital information from the digital baseband signal.
A communications receiver comprising:
- an optical terminal for receiving an optical signal transmitted within a free space environment wherein the optical signal includes a data packet;
- an optical signal conditioner including an optical amplifier, an optical bandpass filter, and an optical attenuator for generating a conditioned optical signal;
- an optical splitter for dividing the conditioned optical signal into a first conditioned optical signal and a second conditioned optical signal;
- a laser diode configured for generating an optical local oscillator signal in response to the phase and the frequency of the incoming signal;
- a ninety-degree optical hybrid configured for extracting an optical baseband signal in response to a superposition of the first conditioned optical signal and the optical local oscillator signal;
- a photodiode configured for converting the optical baseband signal into a digital baseband signal;
- and
- a digital signal processor configured for extracting the data packet from the digital baseband signal.
Dependencies are inferred from the claim text.