6 October 2006 Material composition and structure design in PCVD silica-based single-mode fiber
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Proceedings Volume 6352, Optoelectronic Materials and Devices; 635236 (2006) https://doi.org/10.1117/12.688282
Event: Asia-Pacific Optical Communications, 2006, Gwangju, South Korea
Abstract
Single mode fiber (SMF) has been used widely in local and access network since the early 1980's. Fiber loss reduction will accelerate the construction of various transmission systems with longer repeater spacing. It has been reported that the transmission loss in SMF increases due to residual stress, which is caused by viscosity mismatch between the core and cladding material. The idea of viscosity matching is to match the viscosity of core and cladding doping to minimize the viscosity difference on the cross-section of the fiber or preform. The dopant concentrations can be chosen so that the viscosity of core and the cladding are equal in ideal step index fiber. However, all the reported viscosity-matching design is based on single dopant, for example, only GeO2 is doped in the central core and only F in the cladding. In this paper, optical loss reduction through viscosity-matched design for the SMF with GeO2-F codoped silica core and cladding is described. The impact of viscosity-matching on optical loss of silica-based single-mode fiber has been investigated in detail theoretically and experimentally based on PCVD fiber. For PCVD optical fiber, F is introduced in core is to reduce the water peak. Single mode optical fiber with low attenuation fabricated by PCVD process can be gotten through viscosity-matching design between core and cladding. Viscosity-matching can reduce the sensitivity of attenuation to drawing tension. The model for estimating the viscosity matching has been deduced, which can not only be used for conventional SMF but also for the fiber with arbitrary index profile.
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Qingrong Han, Xiujian Zhao, Feng Tu, Jie Luo, "Material composition and structure design in PCVD silica-based single-mode fiber", Proc. SPIE 6352, Optoelectronic Materials and Devices, 635236 (6 October 2006); doi: 10.1117/12.688282; https://doi.org/10.1117/12.688282
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