Optical Communication Relay Payload for High-Bandwidth Satellite Networks
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Solution Overview
Problem
Current satellite communication systems, particularly in equatorial regions, face limitations in bandwidth and connectivity due to the use of Radio Frequency signals, leading to high latency and restricted access, which is exacerbated by the lack of inter-satellite links and inadequate infrastructure, making it difficult to provide high-bandwidth internet connectivity to rapidly growing business centers and underserved markets.
Innovation Solution
A high-bandwidth transparent optical communication relay architecture utilizing a constellation of Medium Earth Orbit (MEO) satellites with inter-satellite laser communication links, enabling redundant connections and rapid reconfiguration, and supporting multiple ground sites with up/down-link telescopes to achieve high throughput and flexibility, independent of optical format and modulation schemes, using C-band or L-band spectral bands with potential expansion to other bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If Radio Frequency signals are used for satellite communication, then coverage area is improved, but bandwidth is restricted to hundreds of MHz to a few GHz
Solution Approach 1:
The patent replaces Radio Frequency electromagnetic signals with Optical Frequency electromagnetic signals for satellite communication. This substitution transitions from RF-based communication systems to optical communication systems, enabling significantly higher bandwidth (at least 100 Gbps per channel) while maintaining coverage capabilities through the satellite constellation architecture
Solution Approach 2:
The patent changes the fundamental parameter of signal frequency from Radio Frequency range to Optical Frequency range. This parameter change enables the system to achieve at least 100 Gbps per channel bandwidth, representing a substantial increase from the hundreds of MHz to a few GHz bandwidth available with RF signals
2Area of stationary object
If Geostationary Earth Orbit satellites are used, then coverage area is improved, but signal latency increases to at least 120 msec per path
Solution Approach 1:
The patent segments the single GEO satellite coverage approach into a constellation of multiple MEO satellites. This segmentation allows the system to provide comparable coverage area while reducing signal latency by positioning satellites closer to Earth (Medium Earth Orbit at 5,000-20,000 km altitude) compared to GEO satellites (36,000 km altitude)
Solution Approach 2:
The patent transitions from a two-dimensional coverage approach (single satellite footprint) to a three-dimensional constellation architecture. By distributing multiple satellites across different orbital positions and using inter-satellite optical links, the system achieves both comprehensive coverage and reduced latency through shorter signal paths
3Device complexity
If inter-satellite links are not implemented, then device complexity is reduced, but connectivity and bandwidth are limited
Solution Approach 1:
The patent merges multiple satellite communication paths into an integrated optical network. By implementing inter-satellite optical links between MEO satellites and integrating them with ground-based optical networks, the system creates a unified high-bandwidth communication infrastructure that provides worldwide connectivity with aggregate bandwidth of at least 100 Gbps per ground site
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 solution provides significantly improved throughput, with the ability to offer at least 800 Gbps to ground sites and 1,600 Gbps between neighboring satellites, ensuring continuous coverage and rapid network reconfiguration, reducing latency and enhancing connectivity while being agnostic to future optical communication standards.
Implementation Method 1
Some limited experiments were conducted for free-space optical communication (FSO), also sometimes referred to as laser communication, or lasercom for short
Data Source
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AI summary
A free space optical communication system (100) and method including: several optical beam expanders (414) for receiving incoming optical signals from ground sites and neighboring satellites; several optical preamplifiers (412) for preamplifying the received optical signals; one or more optical main amplifiers (404) for amplifying the preamplified optical signals; and an optical switch (408) for directing respective amplified optical signals to respective destinations via a respective optical beam expander. The respective amplified optical signals are inputted to a respective optical beam expander (414) for transmission to said respective destinations, as outgoing optical signals.