Japan Agency for Marine-earth Science and Technology

Shimadzu Corporation

Japan Agency for Marine-earth Science and Technolog

Takao Sawa

Naoki Nishimura

Keiko Sato

This optical communication device () is provided with a plurality of light-receiving elements () and a plurality of optical fibers (). The plurality of optical fibers each includes a light-incident end portion () for communication light and a light-emission end portion () for communication light. The plurality of light-emission end portions is each arranged near each of the plurality of light-receiving elements. The plurality of light-incident end portions is each configured to be capable of being arranged in a predetermined position in a predetermined direction.

Optical communication device

The present invention relates to a fiber branch structure for spatial optical communication for transmitting information by emitting communication light. The fiber branch structure is provided with: a light emitter configured to emit communication light; a light emission controller configured to control the light emitter; an optical fiber configured to transmit the light emitted from the light emitter; a distributor configured to distribute the light, the distributer being optically coupled to an output terminal of the optical fiber; and an optical fiber group optically coupled to a plurality of output terminals of the distributor. According to the present invention, a communication area can be established without blind spots. That is, the fiber branch structure for spatial optical communication according to the present invention includes an optical fiber group optically coupled to a plurality of output terminals of the distributor. A communication area can be established more assuredly by such an optical fiber group, which prevents the optical communication from being interrupted.

Fiber branch structure for spatial optical communication and optical communication system equipped with same

This optical communication device () is provided with: a plurality of light-receiving elements () configured to receive communication light, the plurality of light-receiving elements being provided so as to correspond to a plurality of channels; and a controller () configured to perform control to invalidate output from a light-receiving element that has received high-intensity light higher in light intensity than a predetermined value among the plurality of light-receiving elements.

This underwater optical wireless communication system () is provided with a plurality of moving bodies () capable of moving underwater. The plurality of moving bodies each includes a plurality of optical wireless communication units () each configured to perform bidirectional communication between the plurality of moving bodies using communication light beams () having wavelengths different from each other in a plurality of directions which are mutually opposite directions. The plurality of optical wireless communication units is configured to perform bidirectional communication between the plurality of moving bodies using communication light beams, the communication beams having the same wavelength with respect to each of the plurality of directions.

Underwater optical wireless communication system, underwater optical communication method, and underwater moving body

A synthetic aperture processing system that includes a signal transmission unit for generating and radiating a plurality of chirp waves to an irradiation region from measuring sites, a signal reception unit for receiving a plurality of reflected waves caused by the plurality of chirp waves, a range compression unit for range-compressing each of the reflected waves and generating reception data consisting of sinc functions, a cross-correlation computation unit for, based on a plurality of model data segments, calculating correlation values representing a degree of correlation between each of the model data segments and the reception data, and image output unit for outputting the correlation values calculated by cross-correlation computation unit.

Synthetic aperture processing system and synthetic aperture processing method

The present information comprises the stages of: applying frequency analysis to positional information on a platform, generating virtual positional information on the platform based on a frequency analysis result; extracting a signal based on the generated virtual positional information; and performing a synthetic aperture processing based on the extracted signal, and in this manner, even if the positional information lacking in precision and inaccurate is used, the shake compensation of the platform in the synthetic aperture processing system can be effectively performed.

Growing community of inventors

Yokosuka, Japan

Takao Sawa