Wave-front Multiplexing for PON Bandwidth Allocation
Find Innovative SolutionsGenerate Solutions
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 bandwidths, enabling multi-dimensional signal propagation and configurable power allocations for optical lasers, thereby breaking bandwidth limits and enhancing resource utilization in PON systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If time division multiplexing is used to share fiber infrastructure among multiple users, then fiber infrastructure efficiency is improved, but bandwidth allocation is limited and subscribers achieve only around 30 Mbps sustained data rates
Solution Approach 1:
The patent transitions from traditional time-division multiplexing (one-dimensional time sharing) to wavefront multiplexing that utilizes multiple spatial dimensions and angles of arrival. By encoding signals with unique angular signatures and using lens arrays to spatially separate them, the system creates additional multiplexing dimensions, enabling simultaneous high-bandwidth transmission to multiple subscribers without time slot restrictions.
Solution Approach 2:
The patent segments the optical signal processing into distinct functional components: lens arrays for angular separation, wavefront multiplexers for spatial signal combination, and wavefront demultiplexers for signal separation at receivers. This segmentation allows independent optimization of each component and enables flexible reconfiguration of bandwidth allocation to different subscribers based on demand.
2Device complexity
If a common optical wavelength is shared among all subscribers, then system complexity is reduced, but bandwidth limits are imposed on individual subscribers
Solution Approach 1:
The patent employs universal optical components (lens arrays, wavefront multiplexers/demultiplexers) that can handle multiple wavelengths and spatial modes simultaneously. These components are designed to work with any combination of subscribers and data rates, providing a scalable architecture that maintains relatively simple system design while enabling high bandwidth allocation to individual users through spatial multiplexing.
3Ease of operation
If fixed time slots are allocated to each subscriber, then resource management is simplified, but bandwidth flexibility and power allocation adaptability are reduced
Solution Approach 1:
The patent implements dynamic resource allocation where the wavefront multiplexer can reconfigure signal routing in real-time based on subscriber demand. Power allocation to different spatial channels and bandwidth assignment to time slots are dynamically adjustable, allowing the system to adapt to varying traffic patterns while maintaining manageable complexity through centralized control of the optical switching fabric.
Data Source
AI summary
A data communication system comprises an optical transferring device, optical network units, and user processors. The optical transferring device splits a received optical signal into split optical signals. Each optical network unit transforms a respective split optical signal into M first electronic signals, M>1. Each user processor comprises an input mapping unit to map the respective M first electronic signals into N second electronic signals, N≥M; an equalization processor to equalize the N second electronic signals and generate a set of N equalized electronic signals; a wave-front demultiplexer to perform a wave-front demultiplexing transform on the N equalized electronic signals, and output N wave-front demultiplexed signals, each of the N wave-front demultiplexed signals being a unique linear combination of the N equalized electronic signals; and an output mapping unit to map the N wave-front demultiplexed signals into at least M third digital electronic data signals.