A Closer Look at ROADM Contention

ROADMs provide the wavelength-switching capability in the optical layer of most transport networks. As the need for greater network configurability grows, ROADMs continue to evolve to provide greater flexibility. More specifically, ROADMs that provide colorless, directionless, gridless, and contentionless operation are on the roadmap of many equipment vendors and service providers. The first three of these properties are easy to define. ROADM contention, however, can take on many forms, which has led to some misconceptions regarding the contentionless property. We examine ROADM contention in more detail in order to provide greater clarity regarding contentionless ROADMs.

[1]  Adel A. M. Saleh,et al.  Wavelength-Selective CDC ROADM Designs Using Reduced-Sized Optical Cross-Connects , 2015, IEEE Photonics Technology Letters.

[2]  Simon Poole,et al.  Bandwidth-flexible ROADMs as network elements , 2011, 2011 Optical Fiber Communication Conference and Exposition and the National Fiber Optic Engineers Conference.

[3]  B. C. Collings.  Wavelength selectable switches and future photonic network applications , 2009, 2009 International Conference on Photonics in Switching.

[4]  P. Palacharla,et al.  Performance of colorless, non-directional roadms with modular client-side fiber cross-connects , 2012, OFC/NFOEC.

[5]  Thierry Zami.  Contention simulation within dynamic, colorless and unidirectional/multidirectional optical cross-connects , 2011, 2011 37th European Conference and Exhibition on Optical Communication.

[6]  J. M. Simmons,et al.  Cost vs. Capacity Tradeoff with Shared Mesh Protection in Optical-Bypass-Enabled Backbone Networks , 2007, OFC/NFOEC 2007 - 2007 Conference on Optical Fiber Communication and the National Fiber Optic Engineers Conference.

[7]  Brandon C. Collings.  Advanced ROADM technologies and architectures , 2015, 2015 Optical Fiber Communications Conference and Exhibition (OFC).

[8]  Paparao Palacharla,et al.  Blocking performance in dynamic optical networks based on colorless, non-directional ROADMs , 2011, 2011 Optical Fiber Communication Conference and Exposition and the National Fiber Optic Engineers Conference.

[9]  Tiejun J. Xia,et al.  Flexible architectures for optical transport nodes and networks , 2010, IEEE Communications Magazine.

[10]  O. Gerstel.  Flexible use of Spectrum and Photonic Grooming , 2010 .

[11]  W. I. Way.  Optimum architecture for M×N multicast switch-based colorless, directionless, contentionless, and flexible-grid ROADM , 2012, OFC/NFOEC.

[12]  Thierry Zami,et al.  Fair comparison of the contentionless property in OXC , 2015 .

[13]  E. Riccardi,et al.  Add and drop architectures for multi-carrier transponders in EONs , 2016, IEEE/OSA Journal of Optical Communications and Networking.

[14]  Ioannis Tomkos,et al.  Optical add/drop multiplexers and optical cross-connects for wavelength routed networks , 2003, Proceedings of 2003 5th International Conference on Transparent Optical Networks, 2003..

[15]  H. Hasegawa,et al.  Evaluations of OXC hardware scale and network resource requirements of different optical path add/drop ratio restriction schemes [Invited] , 2012, IEEE/OSA Journal of Optical Communications and Networking.