Scalability analysis of WSS-based ROADMs

Reconfigurable Optical Add/Drop Multiplexers (ROADMs) are becoming the industry standard for optical transparent switching in long-haul networks. ROADMs introduce new flexibility features towards full dynamic networks. In this paper, we investigate the scalability limits of the ROADM. We introduce a method to compute the number of ROADM internal subsystems (namely the wavelength selective switches) for a given traffic request. We evaluate the working and the blocking states of the ROADM with relation to its features of colorless, directionless and contentionless. We propose a method to compute the node requirements for a given set of network parameters.

[1]  Chris Matrakidis,et al.  Routing in dynamic future flexi-grid optical networks , 2012, 2012 16th International Conference on Optical Network Design and Modelling (ONDM).

[2]  S. Tibuleac,et al.  Transmission Impairments in DWDM Networks With Reconfigurable Optical Add-Drop Multiplexers , 2010, Journal of Lightwave Technology.

[3]  GringeriSteven,et al.  Flexible architectures for optical transport nodes and networks , 2010 .

[4]  Masahiko Jinno,et al.  Enabling technologies for adaptive resource allocation in elastic optical path network (SLICE) , 2010, Asia Communications and Photonics Conference and Exhibition.

[5]  Fred Heismann.  System requirements for WSS filter shape in cascaded ROADM networks , 2010, 2010 Conference on Optical Fiber Communication (OFC/NFOEC), collocated National Fiber Optic Engineers Conference.

[6]  K. Venkataramaniah,et al.  Versatility of a colorless and directionless WSS based ROADM architecture , 2009, 2009 First International Communication Systems and Networks and Workshops.

[7]  Thomas A. Strasser,et al.  ROADMS Unlock the Edge of the Network , 2008, IEEE Communications Magazine.

[8]  S.K. Korotky,et al.  Network global expectation model: a statistical formalism for quickly quantifying network needs and costs , 2004, Journal of Lightwave Technology.

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

[10]  Lei Zong,et al.  Statistical method for ROADM cascade penalty , 2010, 2010 Conference on Optical Fiber Communication (OFC/NFOEC), collocated National Fiber Optic Engineers Conference.