Ultra-low loss fibres allow cable systems to achieve longer transmission distances without optical signal regeneration and reduce the overall network construction costs. At the same time, terrestrial optical cables have to operate over a wide range of temperatures, have medium or high fibre density and maintain their loss performance after installation. In this paper, we show results of the attenuation measurements of terrestrial cables with ultra-low loss fibres after field installation. The mean fibre attenuation used for the deployment discussed in this paper was less than 0.163 dB/km, excluding splices. The mean value for attenuation in the installed optical ground wire (OPGW) cables including splice losses was measured to be 0.165 dB/km at 1,550nm wavelength. Such a low level of cable attenuation enables 100+ G unrepeatered signal transmission at distances longer than 500 km.
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