Abstract
G.652 standard single-mode fiber (SSMF) is today considered as the most efficient
solution to transport 40 Gbps and 100 Gbps data traffic over ultra long-haul distances
on terrestrial transport networks. In the early 2000s, there was a trend to replace
legacy G.652 fibers, which were strongly impaired by polarization mode dispersion (PMD),
by G.655 fibers. For economic reasons, incumbent operators decided to keep their legacy
G.652 fiber infrastructure, while replacing gradually the most impaired fibers by low
PMD G.652 fibers over the links transporting the highest amount of traffic. In this
context, we performed in 2009 an experimental evaluation of the performance of a new
ultra low loss (ULL) and low PMD G.652 fiber to carry 40 Gbps WDM systems over ultra
long-haul distances by using various modulation formats (NRZ-OOK and NRZ-DPSK) and
amplification schemes (hybrid Raman-EDFA and EDFA only). We demonstrated record
transmission distance of 4400 km at 40 Gbps line rate when NRZ-DPSK was combined with
hybrid Raman-EDFA amplification. We complete here this previous study with new results,
coming in particular from an extensive experimental and numerical comparison of the
transmission performance of this new ULL G.652 fiber with the legacy G.652 fiber, used
in the field for 20 years. We demonstrate in particular that this new SMF-28® ULL
optical fiber increases the maximum transmission reach by ~30%, whatever
the amplification scheme, when NRZ-DPSK is used.
© 2011 IEEE
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