Optical Multiplexer Switch for Space Communication
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Solution Overview
Problem
Current Optical Cross-Connect (OXC) Switch technology is inadequate for space systems due to its ground-based design, lack of redundancy, and limited flexibility in handling noise and signal splitting, which are critical for reliable high-speed data exchange in space environments.
Innovation Solution
A combined optical device that integrates a demultiplexer with a two-dimensional directional light switch, utilizing microelements like Digital Micro-mirror Devices (DMD), Optical Phased Arrays (OPA), or Liquid Crystal on Silicon (LCoS) to enable high-bandwidth switching, noise filtering, and multicasting, while providing redundancy and graceful degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional OXC switch designs are used, then optical switching functionality is provided, but the weight of the payload increases and performance is reduced
Solution Approach 1:
The patent combines multiple optical functions (demultiplexing, switching, filtering) into a single integrated optical device. The demultiplexer separates WDM channels, while the spatial light modulator performs switching and the filter reduces ASE noise, all within one compact system rather than using separate ground-based OXC components.
Solution Approach 2:
The optical device performs multiple functions simultaneously: demultiplexing WDM channels, switching optical signals to different destinations, filtering ASE noise, and providing redundant signal paths. This multi-functionality replaces what would traditionally require multiple separate ground-based optical components.
2Adaptability or versatility
If ground-based OXC switch technology is used, then optical signal switching is achieved, but flexibility in handling noise and signal splitting is limited
Solution Approach 1:
The spatial light modulator provides dynamic, reconfigurable control over optical signal routing and filtering. Unlike fixed ground-based OXC designs, this device can be dynamically adjusted to switch between different demultiplexed channels, modify signal paths, and adapt filtering characteristics in real-time based on operational requirements.
Solution Approach 2:
The device enables flexible control of optical parameters including wavelength channel selection, signal routing destinations, and filtering characteristics. The spatial light modulator can change its transmission pattern to dynamically adjust which wavelengths are switched to which outputs, providing adaptable noise filtering and signal splitting capabilities.
3Reliability
If traditional optical components are used, then basic switching is provided, but redundancy and graceful degradation are not achieved
Solution Approach 1:
The demultiplexer separates the optical signal into individual WDM channels, creating distinct signal paths for each wavelength. This segmentation allows the system to selectively route or filter specific channels while maintaining others, providing inherent redundancy where individual channel failures do not compromise the entire system.
Solution Approach 2:
The device provides built-in redundant signal paths and filtering capabilities that prepare the system in advance for potential failures. The spatial light modulator can be configured to route signals through alternative paths or apply filtering to mitigate the impact of radiation-induced damage or component failures, enabling graceful degradation.
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
The solution enhances the reliability and performance of optical communication networks by allowing individual channel switching, reducing noise, and offering flexible multicasting and redundancy, thereby improving the reliability and longevity of space-based optical communication systems.
Implementation Method 1
receiving a plurality of optical input signals, each comprising a subset of available channel frequencies
Implementation Method 2
a comb filter to remove Amplified Spontaneous Emission (ASE) noise from each channel
Implementation Method 3
a two-dimensional spatial light modulator to direct the optical signals to different output paths
Data Source
Figure 1
Figure 2A~2B
Figure 3A~3B
AI summary
Device and method for optically switching a plurality of optical input signals include: receiving the plurality of optical input signals, wherein one or more of the optical input signals represent multiple channels at different channel frequencies; collimating the received plurality of optical input signals; removing noise between the channels by a comb filter; dispersing the collimated optical signals so that signals of different wavelength are separated by different angles; focusing the optical signals separated by different angles on a light switch device having a plurality of micromirrors; and controlling the light switch by a control signal to direct one or more of the optical signals separated by different angles to one or more output fibers for multicasting of the optical input signals.