Free-Space Optical Network Path Management via Wavelength Switching
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Solution Overview
Problem
Existing directional point-to-point networks, particularly in aerospace and mobile environments, face challenges in efficiently managing optical signal transmission and reception due to factors like weather conditions and fading, which affect communication reliability and efficiency in free-space optical communication systems.
Innovation Solution
A system comprising a central control system and multiple stations equipped with wavelength selectable switches, optical-electrical-optical modules, and processors that determine and manage paths for optical signal transmission, perform error/fade detection and correction, and adjust pointing directions and port assignments to optimize communication conditions, including using high-altitude platform stations and ground stations for optical circuit switching and conversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If optical circuit switching is used in free-space optical communication networks, then communication efficiency is improved, but system complexity increases due to the need for wavelength selectable switches and path management
Solution Approach 1:
The system segments the optical network into multiple wavelength channels and divides path management into discrete segments controlled by wavelength selectable switches at each node. This allows independent control of different wavelengths and paths, improving efficiency while managing complexity through modular segmentation.
Solution Approach 2:
The system implements dynamic path selection and wavelength assignment based on real-time communication conditions. The central control system dynamically adjusts paths and wavelength allocations to optimize communication efficiency, adapting to changing network conditions without requiring static complex infrastructure.
2Reliability
If dynamic path management is implemented to mitigate weather and fading effects, then communication reliability is improved, but control system complexity increases
Solution Approach 1:
The system implements feedback mechanisms where stations report communication conditions (weather, fading) to the central control system, which then adjusts paths and wavelength assignments accordingly. This feedback loop improves reliability by adapting to real-time conditions while centralizing control logic to manage complexity.
Solution Approach 2:
The central control system acts as an intermediary between individual stations, managing path selection and wavelength allocation centrally. This mediator approach improves reliability through coordinated path management while reducing the complexity burden on individual stations by centralizing control intelligence.
3Adaptability or versatility
If optical-electrical-optical conversion is used at intermediate stations, then signal processing capability is improved, but energy consumption increases
Solution Approach 1:
The system implements OEO conversion only at specific intermediate stations where signal processing is needed, rather than at all stations. This localized approach improves signal processing capability where required while minimizing energy consumption by avoiding unnecessary conversions at stations where optical switching alone suffices.
Solution Approach 2:
The system dynamically determines which stations perform OEO conversion based on communication conditions, path requirements, and signal quality. By changing the operational parameters of intermediate stations (whether to perform OEO or just OCS), the system optimizes the balance between processing capability and energy consumption.
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
Enhances communication reliability and efficiency by dynamically managing paths and signal processing to mitigate the impact of weather and fading conditions, ensuring robust data transmission across the network.
Implementation Method 1
an optical-electrical-optical (OEO) module... process an electrical signal, the electrical signal being extracted, using the OEO module, from an optical signal received
Implementation Method 2
The wavelength selectable switch is optionally configured to receive a first signal having a first wavelength and a second signal having the first wavelength, and transmit a combination of the first signal and the second signal
Data Source
AI summary
The disclosure provides for a system that includes a plurality of stations equipped for free-space optical communications (FSOC) in a network and a central control system. At least one station in the plurality of stations includes a wavelength selectable switch, an OEO module, and one or more first processors. The one or more first processors are configured to control the wavelength selectable switch, process an electrical signal that is extracted using the OEO module, and communicate with the central control system. The central control system includes one or more second processors that are configured to receive data regarding FSOC communication conditions at the plurality of stations, determine a path between stations through the network based on the received data, and transmit instructions to the plurality of stations.