Wave-front Multiplexing for PON Bandwidth Limits
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Solution Overview
Problem
Traditional Passive Optical Networks (PON) architectures face limitations in bandwidth allocation, resulting in subscribers achieving only around 30 Mbps of sustained data rates due to shared optical wavelengths and time division multiplexing, which restricts fiber infrastructure efficiency.
Innovation Solution
The implementation of wave-front multiplexing and demultiplexing techniques to dynamically allocate time slots and bandwidth, allowing for multi-dimensional signal propagation and configurable power allocations, thereby breaking bandwidth limits for subscribers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If time division multiplexing is used to share the optical fiber among multiple users, then the fiber infrastructure cost is reduced, but the bandwidth available to each subscriber is limited to around 30 Mbps
Solution Approach 1:
The patent applies wavefront multiplexing to add spatial dimensionality to the traditional time-division multiplexed optical fiber system. By encoding data across multiple spatial modes (wavefronts) of the optical signal simultaneously, the system achieves multi-dimensional signal propagation, allowing multiple data streams to coexist on the same fiber without temporal separation, thereby breaking the 30 Mbps bandwidth limit while maintaining fiber sharing
Solution Approach 2:
The invention changes the fundamental parameters of optical signal transmission by utilizing multiple spatial modes and wavefront characteristics instead of relying solely on temporal slot allocation. This parameter transformation enables higher data rates by exploiting the spatial structure of optical waves, converting a single-dimensional (time) multiplexing system into a multi-dimensional (space-time) system
2Device complexity
If a common optical wavelength is used by all subscribers, then the system complexity is minimized, but the data transmission capacity is constrained
Solution Approach 1:
The patent introduces spatial mode dimensionality to the optical transmission system, allowing multiple independent data streams to propagate simultaneously through different spatial modes of the same optical wavelength. This enables the system to achieve high transmission capacity without requiring multiple wavelengths or complex wavelength management, maintaining relative system simplicity while dramatically increasing data rates
3Ease of operation
If fixed time slots are allocated to each subscriber, then the network management is simplified, but the bandwidth allocation cannot adapt to varying user需求的
Solution Approach 1:
The patent implements dynamic wavefront multiplexing configurations that can adaptively adjust the number of active spatial modes and their corresponding data rates in real-time. The system can dynamically reconfigure which spatial modes are used and how data is distributed across them, enabling flexible bandwidth allocation that responds to varying user demands while maintaining manageable network operations through centralized control
Data Source
AI summary
A data communication system comprises a wave-front multiplexer configured to wave-front multiplex first electronic signals into second electronic signals. An electronic-to-optical converter is configured to convert a third electronic signal carrying information associated with the second electronic signals into a first optical signal. An optical transferring module is configured to split the first optical signal into second optical signals, wherein each of the second optical signals carries the same data as the first optical signal carries. Optical-to-electronic converters are configured to convert the second optical signals into fourth electronic signals. Wave-front demultiplexers each are configured to wave-front demultiplex the fourth electronic signals into fifth electronic signals equivalent to the first electronic signals respectively.