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Temperature optical fiber

Temperature of an optical fiber.

Symbol
$\theta_{fo}$
Unit
°C
Formulas
$\theta_{a}+v_{4} \Delta \theta_{p}-\left(v_{4}-1\right) \Delta \theta_{x}$fiber optic cable buried
$\frac{\theta_{t} T_{sa}+\theta_{at} T_{st}}{T_{sa}+T_{st}}$fiber optic cable in ventilated tunnel
$\theta_{t}$fiber optic cable in channel (Heinhold)
$\theta_{at}$fiber optic cable in air-filled trough, in air-filled pipe with objects
$\theta_{a}+v_{4} \Delta \theta_{p}-\left(v_{4}-1\right) \Delta \theta_{x}$fiber optic cable in filled troughs
Related
$\Delta \theta_{p}$
Temperature rise by other buried objects [K]
$\Delta \theta_{x}$
Critical soil temperature rise [K]
$T_{sa}$
Thermal resistance convection object—air [K.m/W]
$T_{st}$
Thermal resistance radiation object—tunnel [K.m/W]
$\theta_{a}$
Ambient temperature [°C]
$\theta_{at}$
Air temperature with load [°C]
$\theta_{t}$
Temperature wall (inner) [°C]
$v_{4}$
Ratio thermal resistivity dry/moist soil
Used in
$\Delta \theta_{max}$
Maximum permissible conductor temperature rise [K]