In 1968, he first proposed that optical fiber can be used for long-distance communication as long as the loss of optical fiber is reduced to a certain extent. Two years later, in 1970, corning company made his prediction of low-loss optical fiber, which changed the world and the life of all mankind, so he was called the father of optical fiber. At present, optical fiber communication is developing in the direction of DWDM and OTDM, that is, one optical fiber can transmit 40Tbit/s information, and China's optical fiber communication network is roughly synchronized with developed countries.