光通信 発祥の地(川内)
ひかりつうしんはっしょうのち
西澤記念資料室が入る東北大学川内キャンパス内の入試センター棟近くに碑が建つ。
写真
碑文
光通信発祥の地
THE CRADLE OF OPTICAL COMMUNICATION
心を込めて
妻みつ子の霊と共に手島透
Professor Jun-ichi Nishizawa's Inventions and Distinguished Contributions in Optical Communication
1950 pin photodiode together with ion-implantation,
pin diode, pnip transistor, SIT
1952 Avalanche photodiode
1957 Semiconductor injection laser (external resonance)
1958 Tunnell diode
1960 Photo-coupler
Semiconductor laser (internal resonance)
1964 Fiber communication and graded index fiber
1965 Semiconductor Raman laser
1966 Laser flip-flop
1972 Vapor pressure control in the processing of Ⅲ - V compounds