Wavelength Allocation Device Using 3R Converter
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Solution Overview
Problem
In high-speed optical communication networks using wavelength division multiplexing (WDM), the limited wavelength conversion range of 3R wavelength converters and the need to maintain signal quality over maximum transmission distances pose challenges in efficiently allocating wavelengths, especially in mesh-type networks where resource wastage and high costs are concerns.
Innovation Solution
A method and device for allocating wavelengths in a WDM network by strategically disposing 3R wavelength converters with a limited wavelength conversion range, selecting paths that satisfy the maximum transmission distance for signal quality, and using a first-fit wavelength allocation approach to minimize the number of converters needed, thereby optimizing resource use and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If 3R wavelength converters are provided for all wavelength channels at each node to enable full wavelength conversion, then wavelength consecutive condition can be satisfied and network flexibility is improved, but device cost and complexity increase significantly
Solution Approach 1:
The wavelength conversion capability is segmented and distributed only to specific nodes (converter nodes) rather than all nodes. The network is divided into segments where wavelength conversion is performed only when necessary, reducing the total number of converters while maintaining end-to-end wavelength consecutiveity through strategic placement of converters at intermediate nodes.
Solution Approach 2:
Intermediate converter nodes act as mediators to perform wavelength conversion when the source and destination nodes cannot directly establish a wavelength-consecutive path. These intermediary nodes enable wavelength conversion only when required, reducing the overall need for converters at every node while still satisfying the wavelength consecutive condition.
2Quantity of substance
If the number of wavelengths per link is rapidly increased to improve network capacity, then more optical paths can be established, but the need for full wavelength conversion at all nodes becomes more costly and resource-intensive
Solution Approach 1:
As the number of wavelengths per link increases, the wavelength conversion function is segmented and provided only at specific converter nodes rather than all nodes. This segmentation allows the network to handle increased wavelength capacity without proportionally increasing the number of converters at each node, as converters are strategically placed only where wavelength conversion is actually needed.
3Device complexity
If wavelength converters are limited to a predetermined number or location in the network, then cost is reduced, but the ability to satisfy wavelength consecutive condition and accommodate all optical path requests is compromised
Solution Approach 1:
The wavelength conversion capability is dynamically allocated to specific nodes based on network conditions and path requirements. Converter nodes are strategically positioned and activated only when needed to satisfy wavelength consecutive conditions, allowing the limited number of converters to adaptively serve multiple optical path requests rather than being statically deployed at all nodes.
Solution Approach 2:
Limited converter nodes serve as intermediaries that are activated selectively to enable wavelength conversion only when required for specific optical paths. This intermediary approach allows a small number of converters to satisfy wavelength consecutive conditions for multiple different paths by dynamically participating in path establishment when needed.
Data Source
AI summary
In a wavelength allocation method in a wavelength division multiplexing network, a 3R wavelength converter having a limited wavelength conversion range is disposed according to a wavelength conversion band of each node, at least one path set between transmitting/receiving nodes is selected, routing paths corresponding to the number of the selected at least one path set between the transmitting/receiving nodes having a request for a new optical path generation are extracted, it is determined whether there is a wavelength consecutive segment set that satisfies a maximum transmission distance for guaranteeing transmission quality of an optical signal and that includes one consecutive wavelength among the extracted routing paths, and a path using a first-fit wavelength is selected from paths of each wavelength consecutive segment and the wavelength is allocated when determining that there is a wavelength consecutive segment set.