In 1970, Corning, an American glass company, was the first to use highly purified quartz to make an optical fiber which only lost twenty decibels of transmission per kilometer.
一九七○年，美國康齡（Corning）玻璃公司，首先用高純度的石英玻璃製成每公里僅損失廿分貝的導光纖維。