These sites commonly
hub last-mile traffic and interconnect to each other using dedicated high-speed links,
commonly OC-192 PoS. However, many carriers are now scaling toward terabit-level
router setups to support growing inter-PoP traffic requirements over public networks.
Here EoF and EoWDM offer the most amenable strategies for high-density point-to-point
PoP interconnection. Foremost, 10G Base-LW/EW (WAN) interfaces will provide good
cost-effectiveness over more expensive OC-192 PoS router interfaces. Secondly, the use
of underlying WDM transport (via EoWDM) can extend such peering setups over much
larger domains.
Ongoing Developments
Future technology developments will continue to shape the EoF and EoWDM service
sectors. In particular, major advances are expected in three areas: improved DWDM
designs, higher-speed Ethernet interfaces, and evolutions in optical network control.
These areas are highlighted briefly.
Advances in WDM Networking
Ongoing advances in soft-optics for ROADM and OXC devices will continue to drive
improved DWDM-layer capabilities in the metro and long-haul space. In particular,
photonic integrated circuit (PIC) technologies hold much promise in coalescing multiple
discrete optical and electronic components onto a single substrate, for example,
lasers, amplifiers, photo-detectors, filters, switches, and so on.
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