Abstract
This paper extends a recent demonstration of a 2-line side 15-mode spatial division multiplexing network node. The node is based on fifteen 2×2 wavelength cross-connects (WXCs) to direct up to six 5 Tb/s, 15-mode, spatial super channels (SSCs). For this demonstration, we consider full add and drop, full express and partial add and drop network scenarios. The WXCs were made using three commercial 4×16 wavelength cross-connects, which were reprogrammed to each implement five identical 2×2 WXCs. The network node is demonstrated using a 6.1 km, 15-mode, multi-mode fiber (MMF) with a standard cladding diameter of 125 <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$µ$</tex-math></inline-formula> m. This is the first field-deployed MMF and is installed in an underground tunnel in the city of L'Aquila, Italy. We further extend the network node to support up to 20 SSCs for a throughput per line side of 100 Tb/s. It is shown that the MIMO requirements for this type of systems is strongly dependent on the differential delays of the different modes propagating within the network node.
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