) Such extreme demands are being
motivated by projections for massive data-center aggregation needs, i.e., large numbers
of 10 Gigabit Ethernet ports. While some support maintaining Ethernet??âĒs traditional
???10x??? scaling factor, others are contemplating a break from tradition in light of technological
and cost factors.
There have been some impressive achievements in 40 Gbps OC-768/STM-256 transport
with vendors demonstrating ultra-long haul reach and many tens of channels per
fiber. In fact, some OC-768/STM-256 products are even coming to market (e.g., DWDM
transport and router interfaces), and various carriers are planning 40 Gbps backbones.
Nevertheless, others are actively studying long-haul 100 Gbps transmission via either
serial or parallel interfaces [15]. Expectedly, serial transmission is much more challenging
as it poses extreme constraints on associated serializer/deserializer devices, optical
modulators, detectors, and so on. Moreover, related SMF dispersion effects will mandate
extensive compensation at much closer distances (10??â20 km). Alternatively, parallel
transmission ameliorates electronic barriers by streaming multiple data paths over separate
DWDM wavelengths, for example, 10 ?â 10 Gbps or 4 ?â 25 Gbps.
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