Spatial Multiplexing Optical Fiber Crosstalk Assessment
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Solution Overview
Problem
Conventional optical transmission systems using spatial multiplexing optical fibers face challenges in accurately assessing the effect of crosstalk on transmission quality due to assuming constant crosstalk, which hinders high-quality signal light transmission.
Innovation Solution
An optical transmission system that modulates light using specific modulation formats based on defined signal light power and crosstalk levels, allowing for the selection of appropriate modulation formats for each propagation mode to optimize transmission quality, considering statistical dispersion of crosstalk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If constant crosstalk is assumed in simulations and experiments, then the analysis is simplified, but the accuracy of transmission quality assessment deteriorates
Solution Approach 1:
The patent changes the parameter assumption from constant crosstalk to statistically distributed crosstalk. Specifically, it models crosstalk as a random variable with statistical distribution characteristics, allowing for more accurate assessment of transmission quality while maintaining analytical tractability through statistical methods rather than requiring complex individual analysis of each crosstalk instance
2Reliability
If individual checks of signal light and modulation format are performed for all propagation modes, then transmission quality is optimized, but the system complexity and measurement time increase
Solution Approach 1:
The patent establishes a universal assessment method that can evaluate transmission quality across multiple propagation modes simultaneously using a single statistical framework. By modeling crosstalk statistics and using representative signal light parameters, the system can determine appropriate modulation formats for all modes without performing separate individual checks, thus reducing measurement time while maintaining optimization
Solution Approach 2:
The patent performs a partial check by evaluating representative signal light characteristics and crosstalk statistics to determine modulation formats for all propagation modes. Instead of exhaustively checking every single signal light instance in every mode, it uses statistical sampling and representative parameters to achieve sufficient transmission quality optimization with reduced measurement effort
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
Enables high-quality and efficient frequency utilization in spatial multiplexing transmission by accurately accounting for crosstalk effects, eliminating the need for individual checks of each signal light and modulation format across all propagation modes.
Implementation Method 1
a modulator to generate signal light by modulating light emitted from the light source, in accordance with a predetermined modulation format
Data Source
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Figure 3A~3C
AI summary
The present invention relates to an optical transmission system to which a spatial multiplexing optical fiber is applied as a transmission line. The optical transmission system performs optical transmission using the spatial multiplexing optical fiber as an optical transmission line for transmission of signal light. Namely, the optical transmission is carried out in accordance with a modulation format in which a Q-factor of the signal which propagates in only certain propagation mode of the spatial multiplexing optical fiber and a ratio of a signal light power to a square of the shortest distance between modulation symbols in the modulation format satisfy a predetermined relational expression.