Full-Duplex MIMO Optical Links for Low-Distortion Satellite Relay
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Solution Overview
Problem
Conventional satellite communication systems face limitations in communication range, bandwidth, and power consumption, particularly in space environments, and the single-input single-output relay method leads to communication distortion and limitations in building inter-satellite networks.
Innovation Solution
A full-duplex multi-input multi-output (MIMO) optical communication system utilizing multiple optical system units that control transmission/reception directions based on communication targets, enabling flexible data transmission and reception through a plurality of paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of stationary object
If a single-input single-output relay method is used, then the antenna size and power consumption are reduced, but the communication distortion increases and reception sensitivity is limited
Solution Approach 1:
The patent divides the single antenna system into multiple optical system units (transmitting units and receiving units), where each unit operates independently to transmit or receive optical signals through different spatial paths, thereby reducing communication distortion while maintaining compact size
Solution Approach 2:
The patent transitions from a single-dimensional SISO approach to a multi-dimensional MIMO optical communication system by utilizing multiple transmitting and receiving units that operate in different spatial dimensions and wavelengths, enabling diverse signal paths and improved reception sensitivity
2Device complexity
If a single-input single-output relay method is used, then the device complexity is reduced, but the diversity in building inter-satellite communication networks is limited
Solution Approach 1:
The patent designs optical system units that can function as both transmitting units and receiving units, allowing each unit to perform multiple functions depending on the communication mode (full-duplex or half-duplex), thereby enabling flexible network configuration and enhanced adaptability for inter-satellite communication networks
Solution Approach 2:
The patent implements dynamic switching between full-duplex and half-duplex communication modes, and between different wavelength assignments, allowing the system to adapt its complexity and functionality based on specific communication requirements and network conditions
3Productivity
If multiple optical system units are used for full-duplex MIMO communication, then the data transmission capacity and reception sensitivity are improved, but the device complexity increases
Solution Approach 1:
The patent utilizes different wavelengths for transmitting and receiving optical signals in full-duplex mode, allowing simultaneous transmission and reception without interference, thereby doubling data transmission capacity while managing system complexity through wavelength division multiplexing
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 data transmission capacity, reduces error rates, and improves reception sensitivity by allowing simultaneous data transmission and reception through multiple paths, thereby increasing system reliability and efficiency.
Implementation Method 1
communication using laser light, which has high directivity and a narrow divergence angle
Implementation Method 2
allow light of at least one first wavelength into a free space and receive light of at least one second wavelength from the free space
Data Source
AI summary
An optical communication apparatus according to one embodiment disclosed herein includes a first optical system unit and a second optical system unit that allow light of at least one first wavelength is transmitted into a free space and receive light of at least one second wavelength from the free space; and a modulation module that provides data which is transmitted to the first and second optical system units, wherein the first and second optical system units are arranged to control transmission/reception directions according to a communication target.