Wavelength Contention-Free via Optical Bypass Within a Colorless and Directionless ROADM [Invited]

Way, W.I.; Ji, Philip N.; Patel, Ankitkumar N.

doi:10.1364/jocn.5.00a220

Cited by 18 publications

(9 citation statements)

References 9 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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show abstract

“…Contentionless ROADM operation means that any port can be routed on any wavelength (color) in any direction without causing resource contention. Designs for such Colorless-Directionless-Contentionless (CDC) ROADMs have been proposed in [168], [169]. In general, the ROADM designs consist of an express bank that interconnects the input and output ports coming from/leading to other ROADMs, and an add-drop bank that connects the express bank with the local receivers for dropped wavelength channels or transmitters for added wavelength channels.…”

Section: B Space Division Multiplexing (Sdm)-sdnmentioning

confidence: 99%

“…In general, the ROADM designs consist of an express bank that interconnects the input and output ports coming from/leading to other ROADMs, and an add-drop bank that connects the express bank with the local receivers for dropped wavelength channels or transmitters for added wavelength channels. The recent designs have focused on the adddrop bank and explored different arrangements of wavelength selective switches and multicast switches to provide add-drop bank functionality with the CDC property [168], [169].…”

Section: B Space Division Multiplexing (Sdm)-sdnmentioning

confidence: 99%

Software Defined Optical Networks (SDONs): A Comprehensive Survey

Thyagaturu

Mercian

McGarry

et al. 2016

IEEE Commun. Surv. Tutorials

305

129

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The emerging Software Defined Networking (SDN) paradigm separates the data plane from the control plane and centralizes network control in an SDN controller. Applications interact with controllers to implement network services, such as network transport with Quality of Service (QoS). SDN facilitates the virtualization of network functions so that multiple virtual networks can operate over a given installed physical network infrastructure. Due to the specific characteristics of optical (photonic) communication components and the high optical transmission capacities, SDN based optical networking poses particular challenges, but holds also great potential. In this article, we comprehensively survey studies that examine the SDN paradigm in optical networks; in brief, we survey the area of Software Defined Optical Networks (SDONs). We mainly organize the SDON studies into studies focused on the infrastructure layer, the control layer, and the application layer. Moreover, we cover SDON studies focused on network virtualization, as well as SDON studies focused on the orchestration of multilayer and multidomain networking. Based on the survey, we identify open challenges for SDONs and outline future directions

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“…In [17], the authors conclude two typical structures for next-generation ROADM. The first one uses optical MCS (multicast switches) and optical amplifiers array as the basic building block.…”

Section: Related Workmentioning

confidence: 99%

“…The second one uses a broadcast-and-select CD-ROADM based on RWA (routing and wavelength assignment) algorithm and a set of contention mitigation hardware. The new ROADM structure proposed in [17] aggregates the two structures mentioned above together by using optical bypass routes within the ROADM itself that can provide N-degree contentionless capability and achieves significant CAPEX saving compared to traditional architectures. But we think the complex structure with vast optical components is far from technical feasibility of realizing small integrated equipment.…”

Section: Related Workmentioning

confidence: 99%

Evaluations for transponder utilizations of two active–standby banks in CD-ROADM optical networks with traffic grooming

et al. 2016

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Reconfigurable optical add/drop multiplexers (ROADMs) are being widely deployed by network carriers in transparent optical networks to increase dynamicity and flexibility. Next-generation ROADMs request colorless, directionless, and contentionless (CDC) features. We evaluate static lightpath blocking performance with different transponder (TP) bank sizes (i.e., number of TP used), to optimize the TP configuration in colorless and directionless ROADMs (CD-ROADMs), while maintaining similar blocking performance as that for a pure contentionless ROADM. In this paper, we introduce an integer linear programming model considering intra-node resource limitations. To achieve scalability, we develop an efficient heuristic algorithm which also takes into account the ROADM add/drop structure. Simulation results show that the two active-standby banks in the CD-ROADM node are able to provide the contentionless feature. Furthermore, the number of TPs in the standby bank can be reduced to 37.5 % of that in the active bank, where TP number is same as the number of wavelengths in each fiber link, in order to simplify CD-ROADM configurations and to reduce its implementation cost. The causes of traffic blocking in the CD-ROADM optical networks are also analyzed. B Min Zhu

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Wavelength Contention-Free via Optical Bypass Within a Colorless and Directionless ROADM [Invited]

Cited by 18 publications

References 9 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

Software Defined Optical Networks (SDONs): A Comprehensive Survey

Evaluations for transponder utilizations of two active–standby banks in CD-ROADM optical networks with traffic grooming

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