Computing approximate blocking probability of inverse multiplexing and sub-band conversion in the flexible-grid optical networks

2016 ◽  
Vol 371 ◽  
pp. 243-247 ◽  
Author(s):  
Yamei Gu ◽  
Shanhong You
Keyword(s):  
Optical Networks ◽  
Blocking Probability ◽  
Inverse Multiplexing ◽  
Flexible Grid

scholarly journals Dynamic Routing and Spectrum Assignment based on the Availability of Consecutive Sub-channels in Flexible-grid Optical Networks

2021 ◽  
Author(s):  
Varsha Lohani
Keyword(s):  
Optical Networks ◽  
Orthogonal Frequency Division Multiplexing ◽  
Blocking Probability ◽  
Frequency Division ◽  
Recent Past ◽  
Spectrum Assignment ◽  
Rsa Algorithm ◽  
Adaptive Parameters ◽  
Routing And Spectrum Assignment ◽  
Flexible Grid

Variable bandwidth channels can be created in Flexible Grid Optical Networks using Optical Orthogonal Frequency Division Multiplexing (O-OFDM). This allows more efficient use of spectrum by allocating integral multiple of basic bandwidth slot to the lightpath requests. In these networks, the constraint of keeping all the allocated slots together is added when deciding the routes for the requests. This constraint is called the contiguity constraint, which makes the routing and spectrum arrangement algorithms more challenging. In any network, the lightpath requests will arrive and depart dynamically and invariably lead to spectrum fragmentation. Hence network will have to reduce the maximum possible utilization as well as increased blocking probability. In this paper, we have presented an improvised Routing and Spectrum Assignment (RSA) algorithm using consecutive spectrum slots that leads to lesser fragmentation. It is evident from the results that the presented RSA algorithm uses adaptive parameters to reduce the blocking probability and fragmentation compared to the other algorithms reported in the recent past.

scholarly journals Dynamic Routing and Spectrum Assignment based on the Availability of Consecutive Sub-channels in Flexible-grid Optical Networks

2021 ◽  
Author(s):  
Varsha Lohani
Keyword(s):  
Optical Networks ◽  
Orthogonal Frequency Division Multiplexing ◽  
Blocking Probability ◽  
Frequency Division ◽  
Recent Past ◽  
Spectrum Assignment ◽  
Rsa Algorithm ◽  
Adaptive Parameters ◽  
Routing And Spectrum Assignment ◽  
Flexible Grid

Variable bandwidth channels can be created in Flexible Grid Optical Networks using Optical Orthogonal Frequency Division Multiplexing (O-OFDM). This allows more efficient use of spectrum by allocating integral multiple of basic bandwidth slot to the lightpath requests. In these networks, the constraint of keeping all the allocated slots together is added when deciding the routes for the requests. This constraint is called the contiguity constraint, which makes the routing and spectrum arrangement algorithms more challenging. In any network, the lightpath requests will arrive and depart dynamically and invariably lead to spectrum fragmentation. Hence network will have to reduce the maximum possible utilization as well as increased blocking probability. In this paper, we have presented an improvised Routing and Spectrum Assignment (RSA) algorithm using consecutive spectrum slots that leads to lesser fragmentation. It is evident from the results that the presented RSA algorithm uses adaptive parameters to reduce the blocking probability and fragmentation compared to the other algorithms reported in the recent past.

scholarly journals LBFA: A Load-Balanced and Fragmentation-Aware Resource Allocation Algorithm in Space-Division Multiplexing Elastic Optical Networks

Photonics ◽  
2021 ◽  
Vol 8 (10) ◽  
pp. 456
Author(s):  
Shengyu Zhang ◽  
Kwan Lawrence Yeung ◽  
Along Jin
Keyword(s):  
Optical Networks ◽  
Blocking Probability ◽  
Optical Network ◽  
Computation Method ◽  
Resource Allocation Algorithm ◽  
Space Division Multiplexing ◽  
Space Division ◽  
Critical Issues ◽  
Joint Load ◽  
Load Balanced

We consider a space-division multiplexing elastic optical network (SDM-EON) that supports super-channels (SChs). A Sch comprises a set of contiguous frequency slots on multiple cores in a multi-core fiber. The problem of finding a lightpath using SChs involves routing, modulation, spectrum and core assignment (RMSCA). To minimize the request blocking probability (RBP), two critical issues must be addressed. First, routing and modulation assignment (RMA) should not cause hotspots, or overutilized links. Second, spectrum and core assignment (SCA) should aim at minimizing fragmentation, or small frequency slot blocks that can hardly be utilized by future requests. In this paper, a pre-computation method is first proposed for better load balancing in RMA. Then an efficient fragmentation-aware SCA is proposed based on a new fragmentation metric that measures both the spectral and spatial fragmentation. With the enhanced RMA and SCA, a joint load-balanced and fragmentation-aware algorithm called LBFA is designed to solve the RMSCA problem. As compared with the existing algorithms, simulation results show that our LBFA provides significant reduction in RBP.

scholarly journals Routing Strategies in Survivable Optical Networks

2013 ◽  
Vol 9 (2) ◽  
pp. 1055-1062
Author(s):  
Ifrah Amin ◽  
Gulzar Ahmad dar ◽  
Hrdeep singh Saini
Keyword(s):  
Optical Networks ◽  
Blocking Probability ◽  
Optical Network ◽  
Routing And Wavelength Assignment ◽  
Wavelength Assignment ◽  
Routing Problem ◽  
Routing Strategy ◽  
Survivable Optical Networks ◽  
Conventional Algorithm ◽  
Better Than

Routing and wavelength assignment problem is one of the main problem in optical networks. The foremost problem is the routing problem after which the wavelength assignment is to be decided. In this paper we have proposed a routing strategy for optimization of the performance of the optical network in terms of blocking probability. The strategy proposed is better than the conventional algorithm in terms of blocking. 

Slot assignment strategy to reduce loss of capacity of contiguous‐slot path requests in flexible grid optical networks

2013 ◽  
Vol 49 (5) ◽  
pp. 359-361 ◽  
Author(s):  
R.C. Almeida ◽  
A.F. Santos ◽  
K.D.R. Assis ◽  
H. Waldman ◽  
J.F. Martins‐Filho
Keyword(s):  
Optical Networks ◽  
Slot Assignment ◽  
Assignment Strategy ◽  
Flexible Grid

VON Provisioning Over Co-Existing Fixed/Flexible Grid Optical Networks

2021 ◽  
Author(s):  
Xiaosong Yu ◽  
Lu Lu ◽  
Yongli Zhao ◽  
Jie Zhang
Keyword(s):  
Optical Networks ◽  
Flexible Grid

Blocking probability analysis model for flexible spectrum optical networks

2014 ◽  
Vol 12 (7) ◽  
pp. 070601-70606 ◽  
Author(s):  
Yongli Zhao Yongli Zhao ◽  
Jie Zhang Jie Zhang
Keyword(s):  
Optical Networks ◽  
Blocking Probability ◽  
Probability Analysis ◽  
Analysis Model

On the Performance of Protected and Online Routing Enabled Translucent Space Division Multiplexing-Based Elastic Optical Networks

2019 ◽  
Vol 0 (0) ◽  
Author(s):  
Sridhar Iyer
Keyword(s):  
Optical Networks ◽  
Blocking Probability ◽  
Optical Network ◽  
Routing Algorithm ◽  
Modulation Formats ◽  
Space Division Multiplexing ◽  
Space Division ◽  
Spatial Modes ◽  
Variability Level ◽  
Network Topologies

AbstractIn this article, we focus on the optimization of lightpath routing in an online Space Division Multiplexing-based Elastic Optical Network (SDM-b-EON) which is protected by the dedicated route protection (DRP) strategy. In view of the aforementioned, the Online Protection and Routing Algorithm with Regeneration (OPaRAwR) method is proposed which (i) protects the lightpaths through DRP, (ii) accounts for the presence of transceivers in the network, and (iii) ensures the routing of translucent lightpaths through the spectral super-channels over the spatial modes links. In regard to regeneration, we investigate two scenarios which differ in their regeneration variability level in addition to the adjustment of modulation formats (MFs) as per the transmission route characteristics. Extensive simulation experiments are conducted considering realistic transmission reach values and two realistic network topologies. The obtained simulation results demonstrate that the proposed OPaRAwR method significantly outperforms various reference techniques in terms of bandwidth blocking probability (BwBP). In addition, the results also show that significant benefits can be obtained in regard to the utilization of resources (spectrum and transceivers) with much lesser BwBP when the regeneration is conducted with complete flexibility and MF conversion is also permitted at every node of the SDM-b-EON.

Analytical models of blocking probability for multi-granularity cross-connect-based optical networks

2009 ◽  
Vol 3 (11) ◽  
pp. 1716 ◽  
Author(s):  
Y. Zhao ◽  
J. Zhang ◽  
D. Han ◽  
X. Zhang ◽  
Y. Yao ◽  
...  
Keyword(s):  
Optical Networks ◽  
Blocking Probability ◽  
Analytical Models ◽  
Cross Connect
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