Branch Ratio Calculation for Unsymmetrical Optical Splitters
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Solution Overview
Problem
A method for calculating the optimum branch ratio of each unsymmetrical optical splitter to maximize the transmission distance of optical signals in a PON system has not been established.
Innovation Solution
A branch ratio calculation method for unsymmetrical optical splitters in a tree-structured optical communication network, where the branch ratios are calculated based on the length of the transmission path to ensure that leaf nodes receive light at a target intensity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If symmetrical optical splitters are used to branch optical signals, then the optical signal intensity is evenly distributed to all output ports, but the transmission distance is limited due to excessive signal loss in long-distance branches
Solution Approach 1:
The patent applies asymmetry by using unsymmetrical optical splitters instead of symmetrical ones. Each unsymmetrical splitter has different branch ratios for different output ports, allowing signals to be distributed unequally based on transmission distance requirements. This resolves the contradiction by enabling longer transmission distances for remote ONUs while maintaining adequate signal intensity, without compromising reception reliability at closer locations.
Solution Approach 2:
The patent implements local quality by optimizing the branch ratio of each optical splitter according to the specific transmission distance and signal requirements of each ONU. Instead of uniform signal distribution, each splitter port is configured with a tailored branch ratio to compensate for transmission losses at different distances, ensuring reliable reception at each local position along the optical network.
2Length of moving object
If unsymmetrical optical splitters are used to extend transmission distance, then signal loss is reduced for distant ONUs, but the complexity of calculating optimal branch ratios increases
Solution Approach 1:
The patent applies preliminary action by pre-calculating the optimal branch ratios for all unsymmetrical optical splitters before network operation. The calculation considers the complete network topology, transmission distances, and signal loss characteristics in advance. This resolves the complexity issue by performing the complex calculation once during network planning, rather than requiring real-time adjustments during operation.
Solution Approach 2:
The patent segments the optical network into hierarchical levels based on transmission distance, with multiple stages of optical splitters. Each stage handles a specific segment of the network with optimized branch ratios. This segmentation approach simplifies the overall calculation complexity by breaking down the large-scale optimization problem into smaller, manageable segments that can be calculated and configured independently.
Data Source
AI summary
A branch ratio calculation method in an optical communication system constituting a tree-structured network in which a first communication device is used as a root node, a plurality of optical splitters are used as intermediate nodes, and a plurality of second communication devices are used as leaf nodes, the method including a calculation step of calculating branch ratios of the plurality of optical splitters based on a length of a transmission path between the first communication device and the optical fiber in order from a hierarchy of the tree-structured network so that the second communication device receives light transmitted by the first communication device at a target intensity.