Wavelength assignment scheme for WDM networks with limited-range wavelength converters

2006 ◽  
Vol 5 (5) ◽  
pp. 410 ◽  
Author(s):  
Sho Shimizu ◽  
Yutaka Arakawa ◽  
Naoaki Yamanaka
Keyword(s):  
Limited Range ◽  
Wavelength Assignment ◽  
Wdm Networks ◽  
Wavelength Converters ◽  
Assignment Scheme

A collision-aware wavelength assignment scheme for GMPLS based WDM networks

2008 ◽  
Vol 12 (8) ◽  
pp. 593-595 ◽  
Author(s):  
Lei Wang ◽  
Jie Zhang ◽  
Guanjun Gao ◽  
Yongjun Liu ◽  
Xiuzhong Chen ◽  
...  
Keyword(s):  
Wavelength Assignment ◽  
Wdm Networks ◽  
Assignment Scheme

scholarly journals Wavelength Converter Based Optimized RWA for All Optical Networks

2019 ◽  
Vol 8 (2) ◽  
pp. 111-115
Author(s):  
Shilpa S. Patil ◽  
Bharat S. Chaudhari
Keyword(s):  
Optical Networks ◽  
Network Performance ◽  
Blocking Probability ◽  
Wavelength Assignment ◽  
Wdm Networks ◽  
Optimal Placement ◽  
Wavelength Converters ◽  
Wavelength Converter ◽  
Call Blocking ◽  
Call Blocking Probability

Wavelength converters are used in WDM networks to avoid call blocking and minimizing the blocking probability. Optimal placement of wavelength converters restricts the call blocking probability, the complexity and improves the overall network performance of the network. In this paper, we propose a new weight dependent routing and wavelength assignment algorithm for the optimal placement of the wavelength converters. The wavelength converter placement was considered separately at all the nodes and the partial nodes. Our algorithm outperforms the previously reported studies and requires a lesser number of wavelength converters to achieve the required performance. It reduces the blocking probabilities up to 5.4% and shows that the first four nodes primarily control the blocking performance of the network. The study also reveals that instead of merely increasing the number of converters, their placement at the right location plays a crucial role in improving the performance. Initially, although an increase in the number of the wavelengths also improves the network performance, the further increase does not contribute much to the reduction of the blocking probability.

A controlled deflection routing and wavelength assignment based scheme in Optical Burst Switched (OBS) networks

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Bakhe Nleya ◽  
Philani Khumalo ◽  
Andrew Mutsvangwa
Keyword(s):  
Wavelength Conversion ◽  
Wavelength Assignment ◽  
Wavelength Converters ◽  
Core Network ◽  
Least Cost Path ◽  
Deflection Routing ◽  
Backbone Networks ◽  
The Core ◽  
Optical Burst

AbstractHeterogeneous IoT-enabled networks generally accommodate both jitter tolerant and intolerant traffic. Optical Burst Switched (OBS) backbone networks handle the resultant volumes of such traffic by transmitting it in huge size chunks called bursts. Because of the lack of or limited buffering capabilities within the core network, burst contentions may frequently occur and thus affect overall supportable quality of service (QoS). Burst contention(s) in the core network is generally characterized by frequent burst losses as well as differential delays especially when traffic levels surge. Burst contention can be resolved in the core network by way of partial buffering using fiber delay lines (FDLs), wavelength conversion using wavelength converters (WCs) or deflection routing. In this paper, we assume that burst contention is resolved by way of deflecting contending bursts to other less congested paths even though this may lead to differential delays incurred by bursts as they traverse the network. This will contribute to undesirable jitter that may ultimately compromise overall QoS. Noting that jitter is mostly caused by deflection routing which itself is a result of poor wavelength and routing assigning, the paper proposes a controlled deflection routing (CDR) and wavelength assignment based scheme that allows the deflection of bursts to alternate paths only after controller buffer preset thresholds are surpassed. In this way, bursts (or burst fragments) intended for a common destination are always most likely to be routed on the same or least cost path end-to-end. We describe the scheme as well as compare its performance to other existing approaches. Overall, both analytical and simulation results show that the proposed scheme does lower both congestion (on deflection routes) as well as jitter, thus also improving throughput as well as avoiding congestion on deflection paths.

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