Hybrid Optical Add-Drop Multiplexing Network Bandwidth Allocation
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Solution Overview
Problem
Existing optical add-drop multiplexing systems face inefficiencies in wavelength utilization due to the need for guard bands, which limit the capacity of optical fiber transmission systems and complicate filtering processes.
Innovation Solution
A hybrid optical add-drop multiplexing network with a wavelength allocation scheme that separates system bandwidth into dedicated channels, re-used channels, and guard bands, allowing for efficient filtering and maximizing the use of system bandwidth by minimizing guard band usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If re-used channels are provided in a system to increase system capacity, then system capacity is improved, but guard bands must be provided in the system bandwidth to allow for filtering of the channels by re-used add/drop filters
Solution Approach 1:
The system bandwidth is segmented into multiple distinct bands: a first band for dedicated channels, a second band for re-used channels, and guard bands separating these bands. This segmentation allows re-used channels to be filtered efficiently while minimizing the total bandwidth consumed by guard bands, as each band can be optimized independently for its specific function.
Solution Approach 2:
Different portions of the system bandwidth are allocated with different qualities and functions: dedicated channels receive full protection and isolation, while re-used channels share bandwidth more efficiently. The guard bands are strategically placed only where needed to separate functional bands, providing local filtering protection rather than uniform protection across the entire bandwidth, thus optimizing the balance between capacity and filtering requirements.
2Reliability
If guard bands are provided to allow for filtering of re-used channels, then filtering reliability is improved, but wavelength efficiency deteriorates
Solution Approach 1:
By segmenting the bandwidth into dedicated and re-used channel bands separated by strategically placed guard bands, the system achieves reliable filtering only where necessary. The guard bands provide sufficient isolation for filter operation while minimizing the total bandwidth consumed, thereby maintaining filtering reliability while maximizing usable bandwidth for actual channel transmission.
Solution Approach 2:
The system changes the parameter of guard band placement from uniform distribution across all channels to selective placement only between functional bands (dedicated and re-used channels). This parameter change optimizes the balance between filtering reliability and wavelength efficiency, as guard bands are provided only where they are functionally necessary to separate different channel types.
3Reliability
If dedicated channels are used for communication between terminals, then communication reliability is improved, but system capacity deteriorates
Solution Approach 1:
The system segments channel allocation into dedicated channels for reliable point-to-point communication and re-used channels for multi-terminal communication. This segmentation allows the system to provide dedicated channels where high reliability is required while utilizing re-used channels to increase overall system capacity, achieving a balance between reliability and capacity through functional band separation.
Solution Approach 2:
The re-used channel bands provide multi-functionality by serving multiple terminal-to-terminal connections across different connectivity patterns. These bands can be dynamically allocated to serve various communication pairs, increasing system capacity while the dedicated channel bands maintain communication reliability for specific connections that require guaranteed performance.
Data Source
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AI summary
An optical add-drop network and wavelength allocation for the same wherein the system bandwidth is separated into a dedicated channel band and re-used channel bands, separated by guard bands, to allocate terminal connections to achieve a minimum number of re-used channels bands for the desired terminal connectivity.