scholarly journals Maximally Spatial-Disjoint Lightpaths in Optical Networks

2018 ◽  
Vol 10 (2) ◽  
pp. 733 ◽  
Author(s):  
M. Waqar Ashraf ◽  
Sevia M. Idrus ◽  
Farabi Iqbal
Keyword(s):  
Optical Networks ◽  
Optical Transmission ◽  
Routing Algorithm ◽  
Spatial Distance ◽  
Physical Plane ◽  
Network Nodes ◽  
Link Failures ◽  
All Optical ◽  
End To End

Lightpaths enable end-to-end all-optical transmission between network nodes. For survivable routing, traffic is often carried on a primary lightpath, and rerouted to another disjointed backup lightpath in case of the failure of the primary lightpath. Though both lightpaths can be physically disjointed, they can still fail simultaneously if a disaster affects them simultaneously on the physical plane. Hence, we propose a routing algorithm for provisioning a pair of link-disjoint lightpaths between two network nodes such that the minimum spatial distance between them (while disregarding safe regions) is maximized. Through means of simulation, we show that our algorithm can provide higher survivability against spatial-based simultaneous link failures (due to the maximized spatial distance).

Localizing link failures in all-optical networks using monitoring tours

2014 ◽  
Vol 58 ◽  
pp. 2-12 ◽  
Author(s):  
Sangman Cho ◽  
Srinivasan Ramasubramanian
Keyword(s):  
Optical Networks ◽  
Link Failures ◽  
All Optical

scholarly journals All-Optical VCSEL-to-VCSEL Injection Based on Cross Gain Modulation for Routing in Multinode Flexible Spectrum Optimization in Optical Fibre Transmission Links

2019 ◽  
Vol 2019 ◽  
pp. 1-11
Author(s):  
P. P. Dlamini ◽  
G. M. Isoe ◽  
D. Kiboi Boiyo ◽  
A. W. R. Leitch ◽  
T. B. Gibbon
Keyword(s):  
Optical Networks ◽  
Optical Fibre ◽  
Optical Transmission ◽  
Cavity Surface ◽  
Gain Modulation ◽  
Spectrum Assignment ◽  
Cross Gain Modulation ◽  
All Optical ◽  
Routing And Spectrum Assignment ◽  
Optical Fibre Transmission

In this paper, we experimentally present a novel, all-optical spectral efficient vertical-cavity surface-emitting laser- (VCSEL-) based technique for routing and spectrum assignment in optical networks. Exploiting all optical VCSEL-to-VCSEL injection to attain cross gain modulation, the optical transmitter is optimized for optical transmission paths to assure quality of service by overcoming blockage for differentiated bandwidth demands during network congestion incidences. A 10 Gbps directly modulated 1549 nm master VCSEL is optically injected into the 1549 nm side modes of a 1550 nm slave VCSEL. The Shannon limit is considered for higher transmission rates with the problem decomposed into degraded routing and spectrum assignment and chromatic dispersion in the optical transmission link penalties. In this work, the proposed technique achieved a 1.3 dB penalty for transmission over a 25 km G.655 nonzero dispersion-shifted single-mode optical fibre, a value within the transmission media and optical system characteristics of 3 dB as recommended by the International Telecommunication Union-Telecommunication (ITU-T). The number of transceivers, switches, and optical transmission links in the network was reduced, increasing the number of satisfied bandwidth requests, thus optimizing the spectral resource utilization.

scholarly journals Fuzzy-Based Adaptive Hybrid Burst Assembly Technique for Optical Burst Switched Networks

2014 ◽  
Vol 2014 ◽  
pp. 1-10
Author(s):  
Abubakar Muhammad Umaru ◽  
Muhammad Shafie Abd Latiff ◽  
Yahaya Coulibaly
Keyword(s):  
Optical Networks ◽  
Switched Networks ◽  
Assembly Algorithm ◽  
End To End Delay ◽  
All Optical ◽  
Assembly Technique ◽  
End To End ◽  
Burst Assembly ◽  
Fuzzy Adaptive ◽  
Optical Burst

The optical burst switching (OBS) paradigm is perceived as an intermediate switching technology for future all-optical networks. Burst assembly that is the first process in OBS is the focus of this paper. In this paper, an intelligent hybrid burst assembly algorithm that is based on fuzzy logic is proposed. The new algorithm is evaluated against the traditional hybrid burst assembly algorithm and the fuzzy adaptive threshold (FAT) burst assembly algorithm via simulation. Simulation results show that the proposed algorithm outperforms the hybrid and the FAT algorithms in terms of burst end-to-end delay, packet end-to-end delay, and packet loss ratio.

ON THE FAULT-TOLERANCE AND SIZE OF WDM OPTICAL NETWORKS

2011 ◽  
Vol 21 (01) ◽  
pp. 3-12
Author(s):  
PIETRO CERES ◽  
RAFFAELE CERES
Keyword(s):  
Optical Networks ◽  
Wavelength Division Multiplexing ◽  
Data Streams ◽  
Fault Tolerant ◽  
Wdm Optical Networks ◽  
Lower And Upper Bounds ◽  
Link Failures ◽  
Wavelength Division ◽  
Multiple Data ◽  
All Optical

In optical networks the approach called wavelength division multiplexing allows multiple data streams to be transmitted concurrently along a single optical link, with different streams assigned separate wavelengths. In this paper we refer to all-optical networks, in which each connection is totally optical except at the terminal nodes. For these networks we determine the minimum possible number of links required to perform a fault tolerant broadcast from any node, in terms of the number of nodes, the number of link failures to tolerate and the number of wavelengths to use. We also give lower and upper bounds on the number of wavelengths required for any broadcast which tolerates a given number of link failures on networks with arbitrary topologies.

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