15 - Degree-4 Photonic Cross-Connect for Flexible provision of Logical Configurations

Prasanna A. Gamage and Huug De Waardt (COBRA Research Institute), Roeland Nuijts (SURFnet)

The number of deployments of reconfigurable photonic cross-connects (PXCs) is increasing due to their ability to economically enable flexible topology evolution and handle rapid, yet unpredictable, bandwidth growth trends. Supporting mesh network architectures, these networks allow the replacement of costly opto-electronic conversions between previously optically isolated network domains with reconfigurable all-optical interconnections. Also, network operators can increase the efficiency and utilization of their networks by strategically increasing the mesh connectivity between nodes. The key component of reconfigurable PXCs is the Wavelength Selectable Switch (WSS), which manages the routing of the wavelength channels within the network. A PXC switch with 100
GHz channel spacing that can grow in-service to higher degree has been proposed in to meet the traffic growth demand. Advances in fiber optic components and demand for increasing channel counts has shrunk channel spacing from 100 GHz to 50 GHz. Further, advanced modulation formats have successfully enabled 40 Gb/s and 100 Gb/s channels to be accommodated with 50 GHz channel spacing. In this context, PXCs with 50 GHz channel spacing can provide future-proof cost effective solution as it provides seamless capacity upgrades and higher channel count in the network.
In this poster, we demonstrate a rack-mounted degree-4 PXC with a channel spacing of 50 GHz and the capacity to reconfigure logically in a predetermined fashion. We also show that 10 Gb/s (NRZ) optical channels can be routed with satisfactory OSNR performance and input power dynamic range.

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