His inventions contributed to the development of internet technology and the Information Age.

In 1953, he joined the Research Institute of Electrical Communication at Tohoku University.

In 1950, the static induction transistor was invented by Jun-ichi Nishizawa and Y.

[8] Nishizawa invented other technologies in the 1960s that contributed to the development of optical fiber communications, such as the graded-index optical fiber as a channel for transmitting light from semiconductor lasers.

Nishizawa was decorated with Order of Culture by the emperor of Japan in 1989.