研究目的
To minimize the cost and power consumption of a hybrid optical network architecture using ILP and compare it with pure EON and MLR WDM networks.
研究成果
The hybrid optical network offers superior spectral efficiency and performance of an EON with lower cost and comparable energy efficiency, making it a promising candidate for next-generation optical networks. It consistently outperforms pure EON and MLR WDM networks in combined cost evaluations over 5 and 10 years.
研究不足
The ILP model has high complexity and may not scale to large networks; simplifications are made (e.g., limiting allocated frequency slots) to reduce complexity. Wavelength conversion during 3R regeneration is not considered, and the model assumes colorless, directionless, and contentionless ROADMs, which may not reflect all real-world scenarios.
1：Experimental Design and Method Selection:
An integer linear programming (ILP) model is developed to minimize capital expenditure (CAPEX) and power consumption for hybrid optical networks. Multipath routing is used instead of single path to handle high traffic loads.
2：Sample Selection and Data Sources:
Simulations are conducted on two network topologies: NSFNET with 14 nodes and 21 links, and JPN-12 with 12 nodes and 17 links. Traffic matrices are based on actual population estimates.
3：List of Experimental Equipment and Materials:
Optical transponders (WDM and BVT types), optical amplifiers (e.g., EDFA), reconfigurable optical add/drop multiplexers (ROADM), 3R regenerators, and IBM ILOG CPLEX V
4：6 ILP solver. Experimental Procedures and Operational Workflow:
Pre-compute k-shortest routes for node pairs, define ILP variables and constraints, run simulations with CPLEX to minimize cost and power consumption under different objectives.
5：Data Analysis Methods:
Compare results for pure EON, pure MLR WDM, and hybrid networks in terms of cost, power consumption, and combined long-term costs using normalized values and electricity prices.
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IBM ILOG CPLEX
V12.6
IBM
ILP solver used for optimization in the simulations.
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Intel CPU
Quad-core at 2.66GHz
Intel
Processing unit for running the ILP solver.
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RAM
12GB
Memory for computational processes.
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WDM Transponder
40Gb/s, 100Gb/s, 400Gb/s
Transmits and receives optical signals at fixed data rates.
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Bandwidth Variable Transponder
BVT
Adjusts data rate and modulation scheme for flexible transmission.
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Optical Amplifier
EDFA
Amplifies optical signals in the network.
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ROADM
CDC (Colorless, Directionless, Contentionless)
Reconfigurable optical add/drop multiplexer for switching and adding/dropping wavelengths.
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3R Regenerator
Regenerates optical signals to extend reach.
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