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Figure 1 | EPJ Quantum Technology

Figure 1

From: Quantum technologies in the telecommunications industry

Figure 1

Simplified view of an optical communications network. A Metropolitan area network links several access networks, where users are connected to the Optical Network Units (ONU). High bandwidth links are required, so typically Wavelength Division Multiplexing technologies are used. Topologies include rings, multi-homed rings and grids. Wavelengths are added/dropped using (Reconfigurable) Optical Add and Drop Modules ((R)OADMS). The access networks aggregate the user traffic at the Optical Line Terminal (OLT) points in the Central Offices (CO). Different metropolitan area networks connect among themselves using the very high-bandwidth long haul connections of the core network, a grid network which heavily use WDM technologies and optical amplifiers

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