Nippon Telegraph and Telephone Corporation

Shiori Konisho

Toshikazu Hashimoto

Mitsumasa Nakajima

Soichi Oka

Masashi Miyata

Kazunori Seno

Takuya Otsuka

An optical operational element which enables a multilayered optical neural network to be constructed without using an optical amplifier is provided. The optical operational element includes: a photothermal conversion unitwhich converts light energy of input light A into thermal energy; a light intensity variation unitwhich is in contact with the photothermal conversion unitand which varies, in accordance with a temperature variation accompanying heat generation or heat absorption by the photothermal conversion unit, intensity of external light B that is introduced from the outside; and a housing unitwhich houses the light intensity variation unitand which introduces the external light B from one side and outputs output light C obtained by attenuating intensity of the external light B to the outside on an opposite side to the one side.

Optical computing element and multi-neural network

An optical transmission and reception system includes an optical transmitter including an optical modulator that optically modulates a transmission signal containing a known signal inserted at predetermined intervals and transmits it to an optical transmission line, and an optical receiver including an optical RC circuit that converts an optical modulation signal received from the optical transmission line into a complex time series signal, a photoelectric conversion element that converts the complex time series signal into an electrical intensity signal, and a digital signal processing unit that performs learning using the known signal as a teaching signal and performs demodulation, based on learning results, using the electrical intensity signal received from the photoelectric conversion element.

Wavelength conversion apparatus

An input/output, a wavelength multiplexer/demultiplexer, and a spatial light modulator are provided. The input/output is configured by an optical waveguide into which multiplex light with multiple wavelengths enters. The wavelength multiplexer/demultiplexer performs demultiplexing for forming a plurality of signal lights by spatially demultiplexing the multiplex light emitted from the input/output, by one diffraction, into light of each wavelength, and multiplexing for multiplexing the spatially demultiplexed plurality of signal lights that are different in wavelength. The wavelength multiplexer/demultiplexer is configured by a metasurface. The spatial light modulator reflects each of the plurality of signal lights in a set direction.

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Tokyo, Japan

Shiori Konisho