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AssigneeHitachi, Ltd.
InventorsTakahiro Nakayama, Kunihiro Tamahashi, Moriaki Fuyama, Hiroyuki Minemura, Yoshio Sato, Nobuyoshi Tsuboi, Hiroaki Koyanagi
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An optical modulation method and apparatus uses superconductive oxide material for the optical modulation element. The current, magnetic field, temperature or pressure applied to the superconductive oxide material is varied so as to induce a superconduction-normalconduction transition, and the resulting variation in optical characteristics such as the reflectivity, transmissivity or refractive index of the superconductive oxide material modulate the input light. The method and apparatus are fast in operation and simple in structure. The method and apparatus also detect the variation in the current, magnetic field, temperature or pressure as a change in the reflectivity, transmissivity or refractive index of the superconductive oxide material on the basis of a superconduction-normalconduction transition.
A method of optical modulation for producing modulated light, said method comprising the steps of:
A method of detecting an external input signal from an external input device using a superconductive oxide material having a T.sub.c of at least 30.degree. K., the superconductive oxide material having different optical properties depending upon whether the superconductive oxide material is in a superconductive state or not, said method comprising the steps of:
An optical modulation apparatus for producing modulated light, said apparatus comprising:
A method of detecting an external input signal from an external input device using a superconductive oxide material having a T.sub.c of at least 30.degree. K., the superconductive oxide material having different optical properties depending upon whether the superconductive oxide material is in a superconductive state or not, said method comprising the steps of:
Dependencies are inferred from the claim text.