Broadband Impulsive Optical Coding for Long-Distance FSO Links
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Solution Overview
Problem
FSO communication systems face limitations due to atmospheric interference, which reduces transmission distance and introduces bit errors, and existing optical systems are not reliable for long-distance data transmission, while radiofrequency and microwave systems cannot meet data demand.
Innovation Solution
An optical system using a modulator system to time slice and encode data on a beam of light, matched to a specific wavelength range, and amplify it for transmission through a variably refractive medium, enhancing optical transport efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If atmospheric transmission is used for FSO communication, then data throughput is increased, but transmission distance is reduced and bit errors are introduced
Solution Approach 1:
The patent applies parameter changes by switching from coherent laser sources to incoherent superluminescent diode sources with broad spectral bandwidth. This fundamental parameter change in the optical source allows the system to achieve both high data throughput and extended transmission distance by matching the broad spectrum to the atmospheric transmission window, thereby resolving the contradiction between productivity and reliability.
2Reliability
If superluminescent diodes are used as optical sources, then transmission distance is extended, but noise in the form of random power fluctuations is produced
Solution Approach 1:
The patent implements feedback mechanisms through coherent detection and signal processing systems that continuously monitor and compensate for power fluctuations. The receiver system uses feedback from the transmitted signal to dynamically adjust detection parameters, thereby suppressing the harmful noise effect while maintaining extended transmission distance capability.
Solution Approach 2:
The patent introduces an intermediary signal processing layer between the superluminescent diode source and the detection system. This intermediary includes broadband filtering and coherent detection mechanisms that act as mediators to separate the useful signal from the harmful random power fluctuations, allowing distance extension while suppressing noise.
3Productivity
If currently available optical systems are used, then some data transmission is achieved, but sufficiently accurate and reliable transmission over long distances is not possible
Solution Approach 1:
The patent applies segmentation by dividing the optical transmission system into distinct functional segments: broadband optical source generation, spectral filtering, modulation, transmission through atmospheric window, and coherent detection. This segmentation allows each component to be optimized independently, achieving high transmission accuracy over long distances while maintaining productivity.
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 achieving high data throughput.
Implementation Method 1
an amplifier configured to amplify the second beam of light to generate a third beam of light
Implementation Method 2
an optical source configured to generate a first beam of light wherein an optical spectrum of the first beam of light is matched to a wavelength range of the at least one modulator
Implementation Method 3
at least one modulator 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
Data Source
AI summary
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.