Optical Receiver Training for Throughput Increases
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Solution Overview
Problem
Current optical communication systems face limitations in bandwidth utilization, particularly when using Wavelength Division Multiplexing (WDM), as they do not efficiently exploit the available bandwidth, leading to the need for additional fibers and increased costs, and existing amplitude modulation (AM) and digital domain power division multiplexing (DDPDM) schemes suffer from interference issues and complex decoding processes.
Innovation Solution
The system employs multiple light sources transmitting at different power levels on the same wavelength, using detection models based on Poisson probability distributions to differentiate between data streams, allowing for simultaneous transmission of multiple data streams on a single optical link, thereby increasing bandwidth without requiring additional fibers or complex interference cancellation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If Wavelength Division Multiplexing (WDM) is used to increase bandwidth, then more channels can be transmitted, but the system complexity and cost increase due to requiring additional fibers and infrastructure
Solution Approach 1:
The patent segments the optical signal into multiple discrete power levels (e.g., 0, 1, 2, 3 photons) that can be independently detected. By dividing the bandwidth utilization into distinct power level segments rather than requiring multiple wavelength channels, the system achieves high bandwidth utilization without the complexity of WDM infrastructure
Solution Approach 2:
The patent changes the parameter being modulated from wavelength (in WDM) to optical power level. By using different power levels of the same wavelength to encode multiple data streams, the system achieves multiplexing capability without requiring multiple wavelengths, thereby reducing system complexity while maintaining high productivity
2Productivity
If Amplitude Modulation (AM) or Digital Domain Power Division Multiplexing (DDPDM) is used to transmit multiple data streams, then bandwidth utilization improves, but interference issues and complex decoding processes arise
Solution Approach 1:
The patent replaces complex iterative decoding algorithms (mechanical/computational process) with a direct probabilistic detection approach. Instead of using successive interference cancellation or complex matrix inversion, the receiver directly computes probabilities based on Poisson statistics, significantly simplifying the decoding process while maintaining high bandwidth utilization
Solution Approach 2:
The detection model automatically accounts for interference from multiple transmitters by using probabilistic reasoning based on observed photon counts. The system self-corrects for interference without requiring explicit interference cancellation algorithms, reducing decoding complexity while maintaining high productivity
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 significantly increases bandwidth utilization, allowing for multiple data streams to be transmitted on a single channel, simplifies decoding, and adapts to varying transmitter conditions, reducing costs and complexity while maintaining high data transmission efficiency.
Implementation Method 1
a receiver which employs a photon detection module to detect the light signals
Implementation Method 2
a glass fiber with internally reflective surfaces (a fiber optic fiber) to a receiver
Data Source
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AI summary
Disclosed in some examples, are optical devices, systems, and machine-readable mediums that send and receive multiple streams of data across a same optical communication path (e.g., a same fiber optic fiber) with a same wavelength using different light sources transmitting at different power levels - thereby increasing the bandwidth of each optical communication path. Each light source corresponding to each stream transmits at a same frequency and on the same optical communication path using a different power level. The receiver differentiates the data for each stream by applying one or more detection models to the photon counts observed at the receiver to determine likely bit assignments for each stream.