Multimode Optical Switching Module for Mode Crosstalk Resolution
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Solution Overview
Problem
Optical networks face challenges in efficiently switching optical signals transmitted in various modes due to wavelength conflicts and limited channel budgets, especially in mesh networks where mode crosstalk and traffic congestion are prevalent.
Innovation Solution
A multimode optical switching module with multi-mode and single-mode ports, incorporating a bidirectional optical mode processor and a controllable switching device that performs mode processing, multiplexing, demultiplexing, and mode conversion to enable controlled switching between different propagation modes, allowing independent switching of optical signals on the same wavelength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wavelength conversion or rerouting is used to resolve conflicts, then signal transmission is enabled, but network complexity and resource consumption increase
Solution Approach 1:
The patent introduces mode division multiplexing as a new dimension for signal transmission. Instead of resolving conflicts through wavelength conversion or rerouting in the traditional spatial/wavelength domain, the system multiplexes signals across multiple propagation modes (LP01, LP11a, LP11b) within the same wavelength and fiber path, effectively adding a new degree of freedom to the transmission space.
Solution Approach 2:
The optical switching module is designed to handle multiple propagation modes simultaneously through a single device structure. The mode-selective switching mechanism allows the same physical device to route different modes (LP01, LP11a, LP11b) to different outputs, eliminating the need for separate switching devices for each mode and reducing overall network complexity.
2Productivity
If more optical channels are allocated to handle increased traffic, then network capacity increases, but the limited wavelength budget is exhausted faster
Solution Approach 1:
The patent multiplexes multiple optical signals across different propagation modes within the same wavelength channel and fiber infrastructure. This mode-division approach allows the network to transmit more signals without requiring additional wavelength channels, effectively utilizing the underutilized spatial mode dimension to expand capacity.
Solution Approach 2:
The system segments the transmission capacity by separating different propagation modes (LP01, LP11a, LP11b) as distinct channels. This segmentation allows independent switching and routing of each mode while maintaining them within the same physical fiber and wavelength framework, enabling finer-grained resource allocation.
3Productivity
If mode division multiplexing is implemented, then transmission capacity increases, but mode crosstalk occurs between signals
Solution Approach 1:
The switching module incorporates feedback mechanisms that monitor signal quality and mode distribution. Based on this feedback, the control system dynamically adjusts the switching decisions to minimize mode crosstalk, selecting optimal mode combinations and routing paths that reduce interference between co-transmitted signals.
Solution Approach 2:
The system dynamically adapts the mode allocation and switching decisions based on real-time network conditions. The controllable switching mechanism can reconfigure which modes are activated and how they are routed, allowing the system to optimize performance and minimize crosstalk under varying traffic patterns and fiber conditions.
4Adaptability or versatility
If optical signals are switched in mesh networks, then network flexibility increases, but conflicts arise at every node
Solution Approach 1:
The optical switching module is designed as a universal device that can handle multiple propagation modes (LP01, LP11a, LP11b) simultaneously through a single integrated structure. This multi-mode capability allows the same switching node to manage diverse signal types without requiring mode-specific handling, simplifying operations and improving reliability in mesh network configurations.
Data Source
AI summary
A method and module for affecting controlled switching of optical signals having different modes of propagation, wherein the module being provided with at least two multi-mode ports MMPs and a plurality of single-mode ports SMPs, the method comprises: inputting at least one multimode optical signal to an MMP of said MMPs; inputting the single mode optical signals to the SMPs; performing mode processing of one or more of the single mode and multi mode optical signals within the switching module, controllably and selectively switching different optical signals inputted to different ports of the module, preferably based on received feedback related to quality information, thereby allowing switching between single mode ports, between multi-mode ports, and between single mode and multi mode ports.