Mode Crosstalk Matrix for Orthogonal Mode Multiplexing

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Solution Overview

Problem

Optical communications using Laguerre-Gaussian, Hermite-Gaussian, and Ince-Gaussian signals face issues with mode crosstalk, which affects the transmission link and requires a method to track and mitigate these effects for improved system performance.

Innovation Solution

A method involving the generation of a mode crosstalk matrix to identify and select adjacent modes for multiplexing with transmitted modes, based on predetermined criteria, to minimize crosstalk and enhance transmission efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If multiple orthogonal modes (LG, HG, IG signals) are multiplexed together to increase data capacity, then spectral efficiency is improved, but mode crosstalk between adjacent modes increases

Engineering Contradiction:

Improvedata capacityVSAvoidmode crosstalk

Core Design Contradiction:

ProductivityVSObject-generated harmful factors

Solution Approach 1:

The patent calculates mode crosstalk matrices beforehand to predict interference between modes before multiplexing occurs. This preliminary analysis allows the system to pre-identify which modes have low crosstalk and should be multiplexed together, preventing harmful interference before it affects data transmission.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent changes the selection parameters for mode multiplexing by using crosstalk matrix values as criteria. Instead of randomly or arbitrarily selecting modes, the system uses calculated crosstalk parameters to determine which modes to combine, thereby optimizing the balance between data capacity and interference minimization.

Inventive Principle:

Principle #35Parameter changes

2Object-generated harmful factors

If adjacent modes are selected for multiplexing based on crosstalk matrix entries, then mode crosstalk is reduced, but system complexity increases due to matrix generation and mode selection processes

Engineering Contradiction:

Improvemode crosstalkVSAvoidmode selection process

Core Design Contradiction:

Object-generated harmful factorsVSDevice complexity

Solution Approach 1:

The mode crosstalk matrix calculation process automatically provides the information needed for mode selection without requiring external intervention or complex decision-making algorithms. The matrix itself serves as the selection guide, where entries directly indicate suitable mode combinations, making the system self-directed in its mode selection process.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The mode crosstalk matrix acts as an intermediary between the available modes and the multiplexing decision. Rather than directly analyzing complex interference patterns, the matrix provides a simplified representation that mediates the selection process, making mode selection more straightforward despite the underlying complexity of mode interactions.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS10326526B2Method for muxing orthogonal modes using modal correlation matrices

Publication Date: 2019.06.18 NXGEN PARTNERS IP LLC

AI summary

A method for transmitting an orthogonal function processed signal over a communications link on a fiber involves generating at least one mode crosstalk matrix illustrating mode crosstalk between transmitted modes and adjacent modes within the fiber. Adjacent modes to be multiplexed together are selected based on entries within the generated mode crosstalk matrix being less than or equal to a predetermined value. The transmitted modes and the selected adjacent modes are multiplexed together into the orthogonal function processed signal for transmission on the communications link on the fiber.