Abstract
Telephone companies serving rural and suburban communities have significant numbers of interoffice trunks that are 20 km or greater. The application of long-wavelength (1300-nm) fiber-optic trans- mission becomes essential if nonrepeatered links are to be utilized which reduce installation and maintenance costs and significantly Improve reliability. Two such links have been installed by Continental Telephone Co. of Virginia: 18.7 km long and 23.5 km long. These systems represent the longest unrepeatered links operating in North America. A fiber type specifically optimized for ultralow loss and high bandwidth at 1300 nm was incorporated into a 4-fiber filled cable (Fig. 1) so that the average cable attenuation measured 0.66 dB/km and the average cable bandwidth exceeded 900 MHz km.
© 1982 Optical Society of America
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