Free-Space Optical RF Transmission Through Atmospheric Distortion
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Solution Overview
Problem
Current FSO communication systems face limitations due to atmospheric interference, which reduces transmission distance and introduces bit errors, and alternative technologies like radiofrequency and microwave communications face spectrum limitations, failing to meet data demand.
Innovation Solution
A free space optical communication system that includes a transmitting element with a processor to separate signals, modulate and amplify light, and a receiving element to correct distortion, using short coherence length sources and optical amplifiers to transmit data through a variably refractive medium.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If free space optical communication is used to increase data throughput, then data transmission capacity is improved, but atmospheric interference reduces transmission distance and introduces bit errors
Solution Approach 1:
The patent changes the coherence length parameter of the optical source to be shorter than 1 millimeter, which fundamentally alters how the light propagates through the atmosphere. This parameter change enables the system to tolerate atmospheric turbulence and interference while maintaining long transmission distances and high data throughput, thus resolving the contradiction between productivity and reliability
Solution Approach 2:
The patent employs dynamic signal processing techniques including quadrature modulation, time-division multiplexing, and adaptive equalization to continuously adjust to atmospheric conditions. The system dynamically compensates for phase and amplitude variations caused by atmospheric interference, maintaining reliable transmission over long distances while preserving high data throughput
2Ease of manufacture
If free space optical communication is used to decrease cost, then system cost is reduced, but transmission distance is limited by atmospheric interference
Solution Approach 1:
By changing the coherence length parameter to shorter than 1 millimeter, the patent enables cost-effective FSO systems to achieve extended transmission distances. This parameter change allows the use of simpler, more affordable optical components while overcoming atmospheric limitations that previously constrained transmission distance
Solution Approach 2:
The patent introduces an intermediary optical source with specific coherence properties that mediates between the transmitter and receiver. This intermediate optical element enables long-distance transmission through atmospheric conditions while maintaining system cost-effectiveness by avoiding the need for expensive alternative technologies
3Productivity
If superluminescent diodes are used in FSO communication, then optical signal generation is achieved, but substantial noise from random power fluctuations reduces transmission quality
Solution Approach 1:
The patent changes the coherence length parameter of the optical source to be shorter than 1 millimeter, which fundamentally alters the noise characteristics. This parameter change suppresses random power fluctuations while preserving the signal generation capability, thereby improving signal quality and transmission reliability
Solution Approach 2:
The patent replaces traditional optical sources with short coherence length sources that inherently suppress noise. This substitution eliminates the random power fluctuation problem associated with conventional sources like superluminescent diodes while maintaining effective optical signal generation for FSO communication
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables highly reliable and available data transmission over long distances, overcoming atmospheric interference and spectrum limitations, and supports data rates exceeding 50 Mbps.
Implementation Method 1
an optical source configured to generate a beam of light
Implementation Method 2
a modulator configured to receive the first time-division combined signal and the beam of light, and modulate the beam of light based on the time-division combined signal to form a modulated beam of light
Implementation Method 3
a first amplifier configured to receive the modulated beam of light from the modulator and amplify the modulated beam of light to produce an amplified beam of light
Implementation Method 4
a photoreceiver configured to receive the amplified beam of light and extract a second time-division combined signal from the amplified beam of light
Data Source
AI summary
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.