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Tensile strength of tailored optical fibres

Romaniuk R.

Opto-Electronics Review

2000

Vol. 8, No. 2

101-116

Data are presented characterising of few groups of compound glass, special, optical fibres designed for photonic functional components and sensors. Tensile strengths exceeding 2 GPa were obtained in these fibres by careful multi-parameter optimisation of the modified multi-crucible technological process. The dependence of tensile strength on fibre material and particular process parameters were measured and assessed for a broad range of process modifications, giving several basic answers concerning the phenomena underpinning the building of internal strength of an optical fibre. Not only the resulting tensile strength was treated as a measure of technological quality but also as an integrated indicator of building a fibre of engineered characteristics from quite distant materials. The difference of thermal expansion coefficients as large as 20%, for some core-cladding glass sets of adjusted technological lengths, resulted in quite durable samples. Multi-layered and shaped-noncircular-core optical fibres showed the strength lesser by 10-40% to reference ones. The expected lifetime characteristics of a reference multicomponent glass fibre, after prooftesting with the load 0.35 GPa was estimated for 25 years under the service load of 0.1 GPa. Analogous measured and calculated data for high silica fibre give service load around 0.2 GPa or only two times bigger than for the multicomponent glass fibre case. The domination of high silica fibres is revealed at higher loads.