Transmission loss of coated single-mode fiber at low temperatures

Abstract

Coated single-mode fibers with various coating thicknesses were manufactured, and loss increases due to cooling were measured. It was found that the excess loss increases steeply in the small V-value region at low temperatures. A simple model for fiber bends in the coating was introduced, and the increases in loss were related to the strain resulting from use of the model. It would appear that the axial compressive strain has a serious influence on the loss increases. A suitable silicone buffer layer for preventing loss increases has been determined. The selected silicone layer diameter is 0.45 mm for a 0.9-mm nylon outer layer diam.

High-temperature stability of optical transmission properties attained by liquid-crystal polymer jacket

“…where E, and Ef are Young's moduli of the silicone rubber (approximately 7.8 X GPa) and the fiber (72 GPa), respectively (13). The calculated E, value (see (4)) is -0.18 percent and is in good agreement with the experimental value of -0.16 to -0.18 percent (Fig.…”

Loss Mechanisms In Monomode Fibers With A Loose Tube, Jelly-Filled Jacket

“…An effective excess length ex with reference to the outer curve of the tube can be defined as follows: ex= ac(To -T) -(ÿ )4(RH+ 7 t)t (1) Here ac is the thermal expansion coefficient or the cable, T the temperature, To the temperature at which the fiber is centered in the loose tube, S the stranding pitch, RH the helix radius and t the fiber clearance within the tube.…”

Transient thermal loading induced microbending loss in carbon-coated optical fibers

“…Since the thermal stresses affect the performance of the optical fibers, they have been extensively studied. Katsuyama et al 7 studied the influence of the axial compressive strain on the transmission loss of coated single-mode fibers at low temperatures. Suhir 8 proposed an analytical evaluation of the thermally induced microbending in dual-coated optical fibers, which are subjected to initial curvatures.…”