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首页> 美国政府科技报告 >Haidensen tenka hikari cable senro no denso chien to ondo no hendo tokusei. (Transmission delay and temperature variations in overhead optic links installed along distribution lines due to meteorological effects).
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Haidensen tenka hikari cable senro no denso chien to ondo no hendo tokusei. (Transmission delay and temperature variations in overhead optic links installed along distribution lines due to meteorological effects).

机译：Haidensen tenka hikari cable senro no denso chien to ondo no hendo tokusei。 （由于气象效应，沿配电线安装的架空光纤链路的传输延迟和温度变化）。

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Transmission delay and temperature variation characteristics in overhead fiber optic links were measured by the whole system time synchronous network evaluation test unit, to clarify the relation between the above and meteorological conditions. The transmission delay measured in the round-trip 25 km overhead links showed daily variations, which was the same as the OPGW (optical ground wire) line. As a result of the regression analysis using meteorological conditions, the transmission delay variation at 5:00 in early morning was greatly affected by the atmospheric temperature, and that at 13:00 in the daytime was affected greatly by the atmospheric temperature and the solar radiation. The coefficients of delay variation with respect to atmospheric temperature were 82 to 97 ps/km/(degree)C for a 48-core cable with 6-core optical fiber unit structure, and 70 to 84 ps/km/(degree)C for a 128-core cable using two-package-core cable. The coefficients depended greatly on the cable structure including OPGW. For the relation between the transmission delay and the mean temperature of cable in the total length, or meteorological conditions, the cable temperature rose more than 10(degree)C at maximum due to solar radiation. Increase of the cable temperature due to solar radiation could be easily estimated only from the atmospheric temperature and delay data. 9 refs., 13 figs.

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