Intra-Node Contention in Dynamic Photonic Networks

Feuer, M.D.; Woodward, S.L.; Palacharla, Paparao; Wang, Xi; Kim, Inwoong; Bihon, Daniel

doi:10.1109/jlt.2010.2101048

Cited by 48 publications

(29 citation statements)

References 10 publications

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“…In addition, use can also be made of broadcasting and selecting [6]- [8] to achieve the directionless operation. Furthermore, the contentionless operation is typically accomplished via pre-installing redundant components such as direction-independent add/drop access stages [9], optical transponders cascaded with optical switches [10] and extra contention-resolution banks [11]. Finally, flexiblegrid ROADMs are often constructed utilizing filterless coherent transponders [6], tunable optical filters [12] and flexible-grid wavelength-selective switches [13].…”

mentioning

confidence: 99%

DSP-Enabled Flexible ROADMs Without Optical Filters and O-E-O Conversions

Jin

Duan

Dong

et al. 2015

J. Lightwave Technol.

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Utilizing Hilbert-pair-based digital filtering, intensity modulation and passive optical coupling, optical filterand O-E-O conversion-free ROADMs with excellent flexibility, colorlessness, gridlessness, contentionlessness, adaptability, and transparency to physical-layer network characteristics are proposed and evaluated, for the first time, which offer DSP-enabled dynamic add/drop operations at wavelength, subwavelength, and orthogonal subband levels. Extensive numerical simulations are undertaken to explore the operation characteristics of the proposed ROADMs in IMDD-based optical network nodes. It is shown that the add/drop operation performance is independent of the signal's location in the digital filtering space. In addition, the results also indicate that the drop operation introduces negligible optical power penalties, while for the worst-case scenarios, optical power penalties induced by the add operation can be 3.5 dB. Furthermore, the impacts of key digital filter parameters and intensity modulation-associated drop RF signals on the ROADM add/drop performance are also investigated, based on which optimum ROADM design criteria are identified not only for effectively reducing the digital filter DSP complexity but also simultaneously improving the ROADM performance.Index Terms-Digital filtering, digital signal processing (DSP), intensity modulation, reconfigurable optical add/drop multiplexer (ROADM).

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mentioning

confidence: 99%

DSP-Enabled Flexible ROADMs Without Optical Filters and O-E-O Conversions

Jin

Duan

Dong

et al. 2015

J. Lightwave Technol.

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“…More precisely, the capabilities to reuse the same node add/drop port in different intervals of time, for different wavelength channels (colorless ports), for different directions (directionless ports), and for both of these without further limitations (contentionless ports) have been the focus of study. The performance improvements provided by the contentionless property in a standalone DWDM node are reported in [6], whereas our work [7] and also the work of [8] assess the network-wide blocking probability achieved with different node architectures and considering multiple network topologies, showing that both the colorless and directionless properties are fundamental to attaining reduced connection blocking probability.…”

Section: Introductionmentioning

confidence: 93%

“…3R regeneration at intermediate nodes can be realized using two transponders (e.g., interconnected via a switch [6]). Optical connections are routed individually on a first come, first routed basis: (i) the shortest hop count routing path (SPR) is used (unless stated otherwise); (ii) only the minimum number of 3Rs required for signal regeneration can be allocated to a connection (no extra 3Rs are used only for the purpose of wavelength conversion); and (iii) for each lightpath of a connection, first-fit wavelength assignment is enforced.…”

Section: A Network and Traffic Setupmentioning

confidence: 99%

Impact of Add/Drop Port Utilization Flexibility in DWDM Networks [Invited]

Pedro

Pato

2012

J. Opt. Commun. Netw.

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Optical transport networks are at the turning point from providing semi-permanent connections to being engineered to efficiently support dynamic optical connection services. Vital to this transition is the availability of node architectures that improve the flexibility of add/drop port utilization, thereby enabling the transponder connected to a port to be reused to realize connections with different wavelength channels or using different input/output fiber links (directions). This paper assesses the network-wide blocking performance provided by node architectures with different degrees of freedom for port reuse. The performance assessment not only clearly highlights the relevance of maximizing the chances of transponder sharing in transport networks, but also shows that the network topology determines which of the degrees of freedom for port reuse is more relevant.

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“…Some studies exist evaluating the impact of intra-node contention on the lightpath blocking performance for a single node [4]- [5]. However, these studies are mostly based on simulations.…”

Section: Introductionmentioning

confidence: 99%

Lightpath blocking performance analytical model for a single ROADM node with intra-node add/drop contention

Gao

Shen

2014

2014 IEEE/CIC International Conference on Communications in China (ICCC)

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In colorless and directionless ROADMs based on broadcast-and-select architectures, due to the intra-node contention, the number of lightpaths that can be added/dropped with the same wavelength is limited by the add/drop contention factor. In this paper, we develop an analytical model to evaluate the lightpath blocking performance for a single ROADM node with intra-node add/drop contention. The study indicates that the model is accurate to effectively predict the simulation results. Also, the add/drop contention factor shows an important impact on the lightpath blocking performance and properly raising contention factor can significantly improve the lightpath blocking performance.

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Intra-Node Contention in Dynamic Photonic Networks

Cited by 48 publications

References 10 publications

DSP-Enabled Flexible ROADMs Without Optical Filters and O-E-O Conversions

DSP-Enabled Flexible ROADMs Without Optical Filters and O-E-O Conversions

Impact of Add/Drop Port Utilization Flexibility in DWDM Networks [Invited]

Lightpath blocking performance analytical model for a single ROADM node with intra-node add/drop contention

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