Multi-Detector Free-Space Optical Links for Atmospheric Interference
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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 systems cannot meet data demand, while Superluminescent diodes produce substantial noise, making them unsuitable for carrier-grade FSO communications.
Innovation Solution
An optical communication system utilizing a waveguide, modulator, amplifier, telescope, detector system, and routing system to transmit and receive data through a variably refractive medium, with features like wavelength channels, combiners, and polarization multiplexing to enhance data transmission reliability and distance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If FSO communication systems are used to transmit data over long distances, then data throughput is increased, but atmospheric interference reduces transmission distance and introduces bit errors
Solution Approach 1:
The patent divides the detection function into multiple independent detectors, each sensitive to different wavelength channels. This segmentation allows the system to distribute the detection load across multiple detectors, improving reliability by reducing the impact of atmospheric interference on any single detection path while maintaining high data throughput through parallel wavelength channels.
Solution Approach 2:
The patent introduces wavelength diversity as an additional dimension to the communication system. By transmitting data across multiple wavelength channels simultaneously and using detectors sensitive to different wavelengths, the system adds a spectral dimension that provides redundancy and resilience against atmospheric interference, thereby improving transmission reliability without sacrificing throughput.
2Productivity
If radiofrequency and microwave communications are used to meet data demand, then existing infrastructure is utilized, but spectrum limitations prevent sufficient data delivery
Solution Approach 1:
The patent replaces radiofrequency and microwave mechanical/electromagnetic wave propagation with optical wave propagation. By using optical communications with multiple wavelength channels, the system achieves significantly higher data delivery capacity while avoiding the spectrum limitations of radiofrequency and microwave systems. The optical domain provides a vastly larger bandwidth resource that can meet future data demands.
3Ease of manufacture
If Superluminescent diodes are used as optical sources, then cost is reduced, but substantial noise is produced making them unsuitable for carrier-grade communications
Solution Approach 1:
The patent changes the key parameter of the optical source from Superluminescent diodes to laser sources. This parameter change transforms the source characteristics by eliminating the substantial noise production of SLEDs while maintaining cost-effectiveness. The laser source provides the coherent, low-noise optical signal required for carrier-grade FSO communications, directly resolving the contradiction between cost and signal quality.
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
The system provides highly reliable and available data transmission over long distances, overcoming atmospheric interference and noise issues, enabling efficient data offloading from radiofrequency and microwave systems.
Implementation Method 1
an optical source configured to generate a beam of light, the optical source comprising a waveguide that amplifies emitted light
Implementation Method 2
a telescope, wherein the telescope is configured to: transmit the amplified beam of light through a variably refractive medium
Implementation Method 3
a detector system, wherein the detector system includes: a plurality of detectors
Data Source
AI summary
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.