Ultra Low Loss (0.1484 dB/km) Pure Silica Core Fiber

摘要

Low loss optical fibers are now indispensable transmission media for long-reach transmission systems. Ultra low loss of 0.1484 dB/km, which breaks the previous record of 0.154 dB/km in 1986, has been achieved. This ultra low loss fiber was obtained by improving pure silica core fiber. Its large effective area of 118 mm{sup}2 contributes to suppress the nonlinear effects. Its possible impact on transmission systems is also described. The transmission loss is below 0.160 dB/km over a wide wavelength range (C and L bands), which is attractive for the EDFA systems, in unrepeatered transmission system, the low loss fiber will extend transmission distance by 33% compared to the conventional GeSMF, and 400 km transmission is possible when it is combined with backward pumped distributed Raman amplification.