Other

Yoshinobu Maeda

Akio Konishi

Hajimu Wakabayashi

Hidekazu Hashima

In the three-terminal optical signal amplifying device, a portion of the neighboring light Lat other wavelength than that of the first wavelength &#x3bb;that is selected from the output light from the elementby the optical add drop filter, and the control light Lat the second wavelength &#x3bb;input from the external are together input to the second semiconductor optical amplifying element. The output light including the output signal light Lat the second wavelength &#x3bb;and the neighboring light at the neighboring wavelength to the second wavelength &#x3bb;that is modulated and controlled by the control light Lin the cross gain modulation is output from the second semiconductor optical amplifying element. And the output signal light Lat the second wavelength &#x3bb;passes through the wavelength selecting filter

Three-terminal optical signal amplifying device

A novel amorphous optical device contributes to economic construction of optical computers. Since economic parallel processing of signals such as image information is made possible, the novel amorphous optical device contributes also to development of optical computers capable of performing ultra-high speed and parallel processing, object recognizing apparatuses in which image optical signals are processed by using image optical signals, motion picture extracting apparatuses used for eyes of robots and object movement monitors and optical surge absorbers. An amorphous optical device which is doped with an element having a negative optical input-output characteristic to incident light, wherein the number of ions and/or atoms of the element is 1&times;10 to 2.8&times;10 per 1 m of an amorphous material, and has a negative optical input-output characteristic to incident light, an amorphous optical device which comprises amorphous optical device described above and shaped two dimensionally and controls image optical signals directly by using image optical signals and an amorphous optical device described above which uses light obtained by spectrally splitting or filtering the sunlight, thermal radiation light or light emitted from a fluorescent material by electrons emitted by electric field, or laser light as the light source are provided.

Amorphous optical device

The present invention provides an optical function device which is capable of inverting and amplifying an optical signal of the optical communication wavelength band, and executing operation of an image optical signal, and is operable in a wide temperature range, said optical function device composed of a light transmitting medium containing a rare earth element, comprising a portion thereof doped with per m or more of the rare earth element for inverting an optical signal and a portion thereof doped with per m or more of the rare earth element for amplifying the optical signal with an excitation light superposed thereto.

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Yokkaichi-shi, Mie, Japan

Yoshinobu Maeda