A framework for analyzing in-band crosstalk accumulation in ROADM-based optical networks

Chentsho, Pema; Cancela, Luís; Pires, Joana

doi:10.1016/j.yofte.2020.102238

Cited by 3 publications

(2 citation statements)

References 24 publications

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“…This interference occurs due to imperfect isolation of optical devices like WSSs, resulting in signal leakages responsible for the impairment. Furthermore, crosstalk accumulates as the optical channel traverses multiple network nodes, which increases its damaging effect [22]. However, it is possible to reduce crosstalk to a negligible level by properly designing ROADMs and selecting high-quality WSSs.…”

Section: Major Physical Impairmentsmentioning

confidence: 99%

On the Capacity of Optical Backbone Networks

Pires

2024

Network

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Optical backbone networks, characterized by using optical fibers as a transmission medium, constitute the fundamental infrastructure employed today by network operators to deliver services to users. As network capacity is one of the key factors influencing optical network performance, it is important to comprehend its limitations and have the capability to estimate its value. In this context, we revisit the concept of capacity from various perspectives, including channel capacity, link capacity, and network capacity, thus providing an integrated view of the problem within the framework of the backbone tier. Hence, we review the fundamental concepts behind optical networks, along with the basic physical phenomena present in optical fiber transmission, and provide methodologies for estimating the different types of capacities, mainly using simple formulations. In particular, we propose a method to evaluate the network capacity that relies on the optical reach to account for physical layer aspects, in conjunction with capacitated routing techniques for traffic routing. We apply this method to three reference networks and obtain capacities ranging from tens to hundreds of terabits/s. Whenever possible, we also compare our results with published experimental data to understand how they relate.

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Section: Major Physical Impairmentsmentioning

confidence: 99%

On the Capacity of Optical Backbone Networks

Pires

2024

Network

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“…This interference occurs due to imperfect isolation of optical devices like WSSs, resulting in signal leakages responsible for the impairment. Furthermore, crosstalk accumulates as the optical channel traverses multiple network nodes, which increases its damaging effect [21]. However, it is possible to reduce crosstalk to a negligible level by properly designing ROADMs and selecting high quality WSSs.…”

Section: Major Physical Impairmentsmentioning

confidence: 99%

On the Capacity of Optical Networks

Pires

2023

Preprint

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Optical networks, characterized by using optical fibers as a transmission medium, constitute the fundamental infrastructure employed today by network operators to deliver services to users. As network capacity is one of the key factors influencing optical network performance, it is important to comprehend its limitations and have the capability to estimate its value. In this context, we revisit the concept of capacity from various perspectives, including channel capacity, link capacity, and network capacity, thus providing an integrated view of the problem. Hence, we review the fundamental concepts behind optical networks, along with the basic physical phenomena present in optical fiber transmission and provide methodologies for estimating the different types of capacities, mainly using simple formulations. In particular, we propose a method to evaluate the network capacity that relies on the optical reach to account for physical layer aspects, in conjunction with capacitated routing techniques for traffic routing. We apply this method to three reference networks and obtain capacities ranging from tens to hundreds of Terabits/s. Whenever possible, we also compare our results with published experimental data to understand how they relate.

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Dynamic routing and wavelength assignment for efficient traffic grooming

Mohan

Kaushal²

2020

Journal of Optical Communications

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The routing and wavelength assignment (RWA) schemes play an important role in all computer networks. The performance of a computer network and resource utilization largely depend on the RWA. The demand for higher bandwidth is increasing with each passing day, so more efficient RWA schemes need to be devolved to cater the increasing requirements. RWA becomes more challenging for dynamic traffic as the nature and flow of data are not known in advance. In this paper, a dynamic RWA scheme has been proposed for establishing a path in optical networks. The proposed scheme is based upon dynamic conversion sensing algorithm. It can be applied on a number of different network topologies. The proposed scheme is dynamic in nature, which is significantly useful for dynamic traffic grooming. The proposed scheme has been applied on 14 nodes National Science Foundation Network (NFSNet). Simulation results have shown that the blocking probability of this scheme is very low as compared to the existing schemes. So, the proposed dynamic RWA scheme enhances the network efficiency. It is useful for congestion hit networks. The reduced blocking probability in wavelength division multiplexing optical networks leads to better resource utilization and enhanced performance.

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A framework for analyzing in-band crosstalk accumulation in ROADM-based optical networks

Cited by 3 publications

References 24 publications

On the Capacity of Optical Backbone Networks

On the Capacity of Optical Backbone Networks

On the Capacity of Optical Networks

Dynamic routing and wavelength assignment for efficient traffic grooming

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