WDM Fiber Line Using Segmented Dispersion Management
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Solution Overview
Problem
Conventional wavelength division multiplexing optical fiber transmission lines face signal deterioration due to interactions between accumulated dispersion and nonlinear effects, particularly at high-speed transmission rates like 40 G b/s, where dispersive flatness and low nonlinearity are insufficient for long-distance transmission.
Innovation Solution
A wavelength division multiplexing optical fiber transmission line is configured with 3 to 6 pairs of alternating positive and negative dispersion fiber sections, each pair consisting of positive and negative dispersion fibers with identical characteristics, and a block dispersion compensator is added to ensure optimal dispersion compensation, reducing signal deterioration by periodically compensating accumulated dispersion across multiple stages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single stage of dispersion management transmission line is used, then the structure is simple, but signal deterioration occurs due to large accumulated dispersion and nonlinear effects
Solution Approach 1:
The transmission line is divided into multiple stages (first stage, second stage, etc.) with each stage containing positive and negative dispersion fibers. This segmentation allows cumulative dispersion to be managed at each stage rather than accumulating over the entire transmission distance, thereby maintaining signal quality without requiring excessive complexity in a single stage.
Solution Approach 2:
The patent implements periodic dispersion compensation by alternating positive and negative dispersion fibers in each stage. This periodic arrangement of dispersion compensation allows the system to continuously manage accumulated dispersion throughout the transmission line, preventing signal deterioration while maintaining a relatively simple overall structure.
2Reliability
If multiple stages of dispersion management transmission line are used, then signal quality is maintained, but the structure becomes complex
Solution Approach 1:
The transmission line is divided into multiple stages (first stage, second stage, etc.) with each stage containing positive and negative dispersion fibers. This segmentation allows cumulative dispersion to be managed at each stage rather than accumulating over the entire transmission distance, thereby maintaining signal quality without requiring excessive complexity in a single stage.
Solution Approach 2:
The patent implements periodic dispersion compensation by alternating positive and negative dispersion fibers in each stage. This periodic arrangement of dispersion compensation allows the system to continuously manage accumulated dispersion throughout the transmission line, preventing signal deterioration while maintaining a relatively simple overall structure.
3Length of moving object
If dispersion compensation is increased to handle large accumulated dispersion, then transmission distance is extended, but nonlinear effects are enhanced
Solution Approach 1:
The transmission line is divided into multiple stages (first stage, second stage, etc.) with each stage containing positive and negative dispersion fibers. This segmentation allows cumulative dispersion to be managed at each stage rather than accumulating over the entire transmission distance, thereby maintaining signal quality without requiring excessive complexity in a single stage.
Solution Approach 2:
The patent implements periodic dispersion compensation by alternating positive and negative dispersion fibers in each stage. This periodic arrangement of dispersion compensation allows the system to continuously manage accumulated dispersion throughout the transmission line, preventing signal deterioration while maintaining a relatively simple overall structure.
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
This configuration effectively suppresses signal deterioration by reducing the maximum accumulated dispersion and nonlinear effects, maintaining transmission quality over long distances at high-speed rates, with the optimal number of dispersion turnarounds and compensator settings ensuring minimal transmission penalty.
Implementation Method 1
a positive dispersion fiber section, of which a wavelength dispersion value is positive, and a negative dispersion fiber section for compensating for accumulated dispersion and the dispersive slope
Data Source
AI summary
A wavelength division multiplexing optical fiber transmission line that reduces signal deterioration caused by dispersion even in a transmission system having a high-speed transmission rate, and is suited to a long-distance transmission. A dispersion management transmission line is connected between optical repeaters. The dispersion management transmission line has 3 to 6 pairs of fiber sections, of which each has a positive dispersion fiber and a negative dispersion fiber, connected in series. Dispersion compensation is made step by step over four (4) times for dispersion and a dispersive slope, which were accumulated by the front-stage positive dispersion fiber, by the next-stage negative dispersion fiber.