Wavelength-Multiplexed Relay Nodes for Satellite Optical Networks
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Solution Overview
Problem
In free space optical communications networks, existing systems face inefficiencies in data transmission and reconfiguration due to the need for crosslinking between relay nodes, which increases payload size, weight, and power requirements, especially when establishing multiple transmission paths between satellites and ground stations.
Innovation Solution
A constellation of relay nodes is configured for wavelength-multiplexed bidirectional optical paths using optical add-drop multiplexers to manage bent pipe channels, allowing data to be transmitted in specific directions based on wavelength, reducing the need for direct crosslinks between next near neighbors and enabling efficient data routing and re-routing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If crosslinks are established between relay nodes to enable multiple transmission paths, then data transmission flexibility is improved, but payload size, weight, and power requirements increase
Solution Approach 1:
Multiple bent pipe channels carrying different wavelengths are combined into a single optical path using wavelength-division multiplexing. The optical add-drop multiplexer merges channels from different directions, allowing multiple transmission paths to share the same physical infrastructure, thereby reducing payload weight while maintaining transmission flexibility.
Solution Approach 2:
The optical add-drop multiplexer serves multiple functions: it adds new bent pipe channels to the optical path, drops existing channels, and passes through channels from other directions. This multi-functional device eliminates the need for separate crosslink equipment at each relay node, reducing overall payload weight and complexity.
2Adaptability or versatility
If crosslinks are established between relay nodes to enable multiple transmission paths, then data transmission flexibility is improved, but power requirements increase
Solution Approach 1:
Multiple bent pipe channels carrying different wavelengths are combined into a single optical path using wavelength-division multiplexing. The optical add-drop multiplexer merges channels from different directions, allowing multiple transmission paths to share the same physical infrastructure, thereby reducing power requirements while maintaining transmission flexibility.
Solution Approach 2:
The optical add-drop multiplexer serves multiple functions: it adds new bent pipe channels to the optical path, drops existing channels, and passes through channels from other directions. This multi-functional device eliminates the need for separate crosslink equipment at each relay node, reducing overall power consumption.
3Device complexity
If conventional relay nodes are used with separate crosslinks for each transmission path, then device complexity is reduced, but transmission efficiency decreases
Solution Approach 1:
The system changes the wavelength parameter to create multiple bent pipe channels. By assigning different wavelengths to different channels, the system enables multiple transmission paths without increasing device complexity, as the optical add-drop multiplexer handles all wavelengths through a unified structure.
Solution Approach 2:
The system adds the wavelength dimension to the transmission medium, allowing multiple channels to coexist in the same spatial path. This transforms the problem from managing multiple separate physical links to managing multiple wavelengths within a single optical path, improving transmission efficiency while maintaining manageable device complexity.
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
This configuration reduces the payload size, weight, and power requirements by utilizing relay nodes as repeaters, enhancing data transmission efficiency and flexibility within the network while maintaining a smaller, lighter, and less expensive satellite payload.
Implementation Method 1
the relay nodes are configured to wavelength-multiplex a plurality of wavelength-dependent optical bent pipe channels into and out of the optical path
Data Source
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AI summary
A free space optical communications network comprises a constellation of relay nodes in serial optical communication to form an optical path. The relay nodes are configured to wavelength-multiplex a plurality of wavelength-dependent optical bent pipe channels into and out of the optical path.