Inter-Spacecraft Optical Link Using Shared Wavelength-Selective Optics
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Solution Overview
Problem
Existing inter-satellite communication systems face challenges with latency and bandwidth limitations, particularly in outer space, where size, weight, and power constraints necessitate improvements in laser terminal architecture and network architecture.
Innovation Solution
Implementing an optical device for inter-spacecraft communication that generates and detects multi-wavelength signals propagating collinearly in opposite directions, using a low component count design with shared optical components to discriminate and redirect signals, enabling high-power, multiband, bidirectional communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional inter-satellite communication systems are used, then communication can be established, but bandwidth is limited and latency is high
Solution Approach 1:
The patent changes the fundamental parameter of signal transmission from radio frequency to optical frequency (light). By using lasers operating at optical wavelengths instead of traditional radio waves, the system achieves significantly higher bandwidth and lower latency, as optical frequencies carry more information and travel faster through the communication channel.
Solution Approach 2:
The patent replaces electronic/radio-based communication systems with optical communication systems. This substitution involves using laser transmitters and photodetectors instead of radio transceivers, fundamentally changing the physical mechanism of signal transmission to achieve superior performance in bandwidth and latency.
2Productivity
If high-performance laser terminal architecture is implemented, then communication performance improves, but size, weight and power consumption increase
Solution Approach 1:
The patent combines multiple optical components into integrated modules. The laser transmitter, photodetector, and associated optics are merged into compact terminal units that can be mounted on satellites. This integration reduces the overall size and weight while maintaining high communication performance.
Solution Approach 2:
The optical terminal design incorporates multi-functional components that serve multiple purposes. For example, the same optical bench and mounting structure support both the transmitter and receiver subsystems, reducing redundant components and overall system mass.
3Device complexity
If optical components are shared between transmitting and receiving functions, then device complexity reduces, but signal discrimination becomes more difficult
Solution Approach 1:
The patent applies wavelength-specific optical filters at each terminal to distinguish between transmitted and received signals. The transmitter is configured to emit at a specific wavelength while the receiver uses a filter tuned to a different wavelength, allowing shared optical components to handle both functions without signal interference.
Solution Approach 2:
The patent introduces wavelength division multiplexing as an intermediary mechanism. By assigning different wavelengths to transmit and receive paths, the system enables single-ended operation where one terminal can simultaneously transmit and receive using shared optics, with the wavelength acting as the discriminating mediator.
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 approach enhances communication bandwidth and reduces costs, weight, and power consumption, allowing for scalable data transmission with reduced interference and increased efficiency in satellite networks.
Implementation Method 1
Free-space optical communication uses light propagating in free space to wirelessly transmit data
Implementation Method 2
a first receiver for detecting a second multi wavelength signal composed of a second set of wavelengths
Implementation Method 3
at least one first optical component configured for propagating the first multi wavelength signal into free space and for capturing the second multi-wavelength signal from free space
Implementation Method 4
at least one second optical component coupled between the first transmitter, the first receiver, and the at least one first optical component, and configured for discriminating between the first multi-wavelength signal and the second multi-wavelength signal
Data Source
AI summary
Methods and devices for inter-spacecraft optical communication are described. The device includes a transmitter for generating a first multi-wavelength signal composed of a first set of wavelengths; a receiver for detecting a second multi-wavelength signal composed of a second set of wavelengths mutually exclusive from the first set of wavelengths; at least one first optical component configured for propagating the first multi-wavelength signal into free space and for capturing the second multi-wavelength signal from free space, the first and second multi-wavelength signals propagating collinearly in free space in opposite directions; and at least one second optical component coupled between the transmitter, the receiver, and the at least one first optical component, and configured for discriminating between the first multi-wavelength signal and the second multi-wavelength signal and redirecting the first multi-wavelength signal to the at least one first optical component and the second multi-wavelength signal to the receiver.