Optical Network Design Apparatus for WDM Cost Minimization
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Solution Overview
Problem
Current WDM network design methods fail to optimize the placement of optical transmission equipment across multiple sub-networks, leading to increased costs and suboptimal transmission quality due to the need for additional OEO regenerators, as they do not accurately account for impairments such as OSNR, PMD, and crosstalk.
Innovation Solution
A network design apparatus that divides the optical network into linear sections and determines the optimal combination of optical transmission equipment using integer programming to minimize the total cost of equipment and OEO regenerators, considering noise and impairment constraints, thereby optimizing equipment placement and reducing the number of necessary OEO regenerators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If optical transmission equipment is placed at multiple stations to improve transmission quality, then transmission quality is improved, but network cost increases
Solution Approach 1:
The network is divided into multiple linear sections, and equipment placement is optimized independently for each section. This segmentation allows the system to identify the minimum necessary equipment placement to maintain transmission quality while reducing overall network cost by avoiding redundant equipment in overlapping sections.
Solution Approach 2:
Different types of optical transmission equipment are selectively placed at different stations based on local transmission requirements. The system evaluates noise accumulation and impairment characteristics of each linear section to determine the optimal equipment type and placement location, rather than uniformly deploying equipment across all stations.
2Reliability
If OEO regenerators are increased to reduce noise accumulation, then transmission quality is maintained, but equipment cost increases
Solution Approach 1:
The system calculates noise accumulation and determines the minimum number of OEO regenerators needed for each linear section before equipment placement. By performing this preliminary calculation based on the noise amount upper limit values, the system avoids over-provisioning regenerators while ensuring transmission quality requirements are met.
Solution Approach 2:
The system uses noise amount upper limit values as critical parameters to determine equipment placement. By changing the approach from uniform equipment deployment to parameter-based placement (using calculated noise thresholds), the system optimizes the balance between transmission quality and equipment cost.
3Reliability
If equipment placement is optimized for one sub-network, then local transmission quality improves, but overall network cost increases due to lack of coordination
Solution Approach 1:
The system merges the optimization of multiple linear sections into a unified integer programming problem. By combining the equipment placement decisions across all sections and solving them simultaneously using the objective function that minimizes total network cost, the system achieves coordinated optimization that reduces overall network cost while maintaining local transmission quality.
Data Source
AI summary
A network design apparatus includes an information acquiring unit acquiring optical network information, a section dividing unit dividing an optical network into linear sections, a combination candidate determining unit determining candidates for combinations of various kinds of optical transmission equipment to be placed in each station in each of the linear sections, a noise amount upper limit determining unit determining an upper limit to the amount of noise allowed for each wavelength path, and an equipment placement unit solving an integer programming problem having an objective function that minimizes the cost of the optical transmission equipment and OEO regenerators, subject to the constraints that one optical transmission equipment combination is selected for each linear section and that the number of OEO regenerators necessary for each wavelength path is determined by the cumulative amount of noise of the wavelength path and the noise upper limit determined for the wavelength path.