Blocking and Waveband Assignment in WDM Networks with Limited Reconfigurability

Turkcu, Onur; Subramaniam, Suresh

doi:10.1109/ofc.2007.4348779

Cited by 7 publications

(7 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…An alternative approach to analytically predicting lightpath blocking with the intra-node contention is a novel contribution of this paper. As mentioned in general in [26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43], this would be more desirable for the design and planning of networks as analytical methods not only give results faster and more conveniently than simulations, they would also allow a better understanding of the underlying behavior of the system. This has been attempted, for the first time in this paper, for ROADM nodes with intra-node contention.…”

Section: Prior Workmentioning

confidence: 99%

“…The studies in [35] evaluated the performance of wavelength-routed optical networks both with and without wavelength conversion capability where the number of wavelengths per link and the number of add/drop ports per node are limited. Subramiam et al [36] also examined the limitations from add/drop ports and their tunabilities. They also compared the performance between the cases of Share-Per-Link (SPL, the ports are dedicated to each link) and Share-Per-Node (SPN, all the links at a node share a pool of ports) in [36].…”

Section: Prior Workmentioning

confidence: 99%

See 1 more Smart Citation

Lightpath blocking analysis for optical networks with ROADM intra-node add-drop contention

Gao

Bose

et al. 2016

Sci. China Inf. Sci.

View full text Add to dashboard Cite

The contention factor limits the extent to which lightpaths using the same wavelength can be added/dropped in a Reconfigurable Optical Add/Drop Multiplexer (ROADM) when it is operated in a colorless and directionless fashion. This paper presents an analysis to estimate the probability of blocked lightpath requests when a node of this type is used and validates the results for three traffic models. Simulations confirm the validity of the analytical results for lightpath blocking both for various values of the add/drop contention factor C and for changing load distribution in the network. We observe a saturation trend in the lightpath blocking performance as the add/drop port count per bank increases and that a high enough value of C reduces lightpath blocking to levels obtainable from an ideal, comntentionless ROADM. When C is small, limitations on the add/drop port count per bank is observed to be the dominant cause of blocking lightpaths while intra-node contention effects have only a limited impact. With increasing C, blocking is caused more because sufficient link capacity is not available and not because free add/drop ports are not available

show abstract

Section: Prior Workmentioning

confidence: 99%

Section: Prior Workmentioning

confidence: 99%

Lightpath blocking analysis for optical networks with ROADM intra-node add-drop contention

Gao

Bose

et al. 2016

Sci. China Inf. Sci.

View full text Add to dashboard Cite

show abstract

“…However, in the case of LTTs if the terminal nodes of a lightpath request do not have transponders that can tune to the same waveband, then that lightpath cannot be established. In [5], we proposed algorithms for assigning wavebands to transponders so that they share more common wavebands and these methods were shown to reduce the blocking.…”

Section: Introductionmentioning

confidence: 99%

Alternate Multihop Routing in Limited Reconfigurable Optical Networks

Turkcu

Subramaniam

2009

IEEE INFOCOM Workshops 2009

Self Cite

View full text Add to dashboard Cite

Abstract-In this paper, we investigate the performance of limited reconfigurable optical networks when multihopping is used. Multihopping is achieved by dropping a wavelength at an intermediate node and transmitting on another wavelength at that node (O-E-O). A route can consist of several such hops each obeying the wavelength continuity constraint individually. Considering that a receiver and a transmitter are used for add/drop at a node, multihopping is restricted by the number of transponders and their tunabilities. We develop a dynamic routing strategy based on the availability and tunability of transponders as well as the wavelength availability. We adopt a Share-Per-Link model for the usage of transponders within a reconfigurable node, and each node is assumed to be equipped with a ROADM which can add/drop any wavelength to any of the ports. We show that the proposed routing strategy improves the blocking performance significantly compared to fixed routing with or without multihopping or alternate routing methods without multihopping.

show abstract

“…In that paper, all the L-ROADMs are identical in that they all can add/drop from the same band of wavelengths. Other related work on limited reconfigurability has appeared in [5] [6].…”

Section: Introductionmentioning

confidence: 99%

Wavebanding in Bi-Directional WDM Ring Networks with Limited Reconfigurability

Alnaimi

Subramaniam

2008

2008 Proceedings of 17th International Conference on Computer Communications and Networks

View full text Add to dashboard Cite

An important factor that affects the cost of WDM networks is the number of wavelengths to be added/dropped by reconfigurable optical add drop multiplexers (ROADMs). Limiting the range of wavelengths that can be accessed at a node reduces costs. In this paper, we study wavelength assignment (WA) in WDM bi-directional ring networks with limited reconfigurability and take up the problem of supporting two traffic types -permutation traffic and all-to-all traffic -while minimizing the worst-case wavelength range of the ROADMs and respecting the wavelength termination and continuity constraints. ROADMs can be limited in tuning range (L-ROADMs) or have full range (FROADMs). In this work, a node can either possess a limited-add L-ROADM or an F-ROADM. For permutation traffic, we show that at least one F-ROADM is necessary, and we also give an upper bound on the number of F-ROADMs needed as a function of the range of L-ROADMs at other nodes. For all-to-all traffic, we develop an integer linear programming (ILP) formulation,and also propose a new wavelength assignment algorithm that uses W u = N 2 4 − N 2 + 1 4 wavelengths. Our heuristic's results are similar to the ILP's. The results show that a saving of 85-93.3% in tuning range is achievable for this type of traffic.

show abstract

Blocking and Waveband Assignment in WDM Networks with Limited Reconfigurability

Cited by 7 publications

References 2 publications

Lightpath blocking analysis for optical networks with ROADM intra-node add-drop contention

Lightpath blocking analysis for optical networks with ROADM intra-node add-drop contention

Alternate Multihop Routing in Limited Reconfigurable Optical Networks

Wavebanding in Bi-Directional WDM Ring Networks with Limited Reconfigurability

Contact Info

Product

Resources

About