Method for manufacturing optical fibre with output point for stray light and measuring fibre optical power, with optical fibre contiguous core , and surrounding sleeve with second lower refraction index, while fibre section

摘要

The method concerns optical fibre (200) with output point for stray light, with core (201) with first refraction point surrounded by sleeve (202) with second smaller refracting point. The section of fibre, contiguous. output point is straight. The method provides electro-thermal treatment within straight section so that a boundary region (203) is formed, within which materials of core and sleeve are mixed together to form stray centers as output point for stray light. Independent claims are included for use of manufactured. optical fibre and for apparatus. for light control for light conducted through fibre.