Optical fibers of Datang, Corning and Huiyuan and fibers of Sumitomo rank the third and the fourth of the country, one of the three major optical cable producing bases.

• 大唐；康宁；汇源的光缆和中住的光纤分列全国第三位和第四位；是国内三大光纤；光缆生产基地之一.