Splitting-Half Dispersion Search for Optical Signal Quality
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Solution Overview
Problem
Conventional dispersion compensation techniques require a long time to search for and set the optimal amount of dispersion control, especially at high transmission speeds like 40 Gb/s, due to variations in temperature and polarization mode dispersion, leading to instability and increased error rates.
Innovation Solution
A dispersion compensation controlling apparatus with a splitting-half searching unit and sweep searching unit that rapidly searches for an optimal amount of dispersion control by generating a quality index and narrowing the search range, allowing for faster initial setting and adaptation to changing conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional dispersion compensation techniques are used to search for optimal dispersion control, then compensation accuracy is improved, but the time required for searching increases
Solution Approach 1:
The patent divides the dispersion control search process into two distinct stages: a rough search stage that quickly identifies a candidate range, and a fine search stage that precisely determines the optimal value within that range. This segmentation allows the system to balance speed and accuracy by performing coarse adjustments first, then refined adjustments only where needed.
Solution Approach 2:
The patent performs preliminary rough search actions before the final fine search. By first conducting a broad search to identify a narrowed candidate range, the system prepares the search space in advance, allowing the subsequent precise search to operate efficiently within a smaller, pre-identified domain rather than searching the entire range from scratch.
2Productivity
If the transmission speed is increased to 40 Gb/s, then productivity is improved, but the stability of dispersion compensation deteriorates due to temperature and polarization mode dispersion variations
Solution Approach 1:
The patent implements a dynamic two-stage search mechanism that can adapt to changing conditions. The system transitions from a static single-stage search to a dynamic process that first performs rough search to establish a baseline, then performs fine search to track and compensate for variations in temperature and polarization mode dispersion, enabling stable operation at high transmission speeds.
Solution Approach 2:
The patent employs feedback mechanisms where the results of the rough search inform the fine search parameters, and the quality index measurements from both stages provide feedback for optimizing dispersion control. This feedback loop allows the system to continuously adjust and maintain stability despite environmental variations at high transmission speeds.
3Reliability
If a comprehensive search range is used to ensure optimal dispersion control, then reliability is improved, but the complexity of the searching process increases
Solution Approach 1:
The patent segments the comprehensive search range into an initial broad search phase and a subsequent focused fine search phase. This segmentation maintains reliability by ensuring the full range is initially considered, then reduces complexity by concentrating detailed search efforts only within a narrowed candidate range identified in the first phase.
Solution Approach 2:
The patent performs preliminary exploration of the comprehensive search range to identify promising regions before conducting detailed searches. This preliminary action ensures that the full search space is adequately covered for reliability, while the subsequent fine search is confined to smaller, pre-identified regions, reducing the overall computational complexity.
Data Source
AI summary
In order to enhance dispersion control, the apparatus includes a dispersion controller; a quality index generator generating a quality index representing a quality of an optical signal output from the dispersion controller; and a searching unit searching for an amount of dispersion control applying to the dispersion controller which amount optimizes the quality index, wherein the searching unit includes a splitting-half searching unit roughly searching, in a splitting half method, a range in which dispersion is controllable by the dispersion controller for an amount of dispersion control such that the quality index generated by the quality index generator becomes preferable, and a sweep searching unit thoroughly searching, by sweeping, a limited range based on the amount of dispersion searched by the splitting-half searching unit for an amount of dispersion control that optimizes the quality index generated by the quality index generator.