Abstract: A powered device includes a photoelectric conversion element, a thermoelectric conversion element and a first power line. The photoelectric conversion element receives and converts feed light into electric power. The thermoelectric conversion element is disposed such that heat can be conducted thereto from the photoelectric conversion element. The first power line transmits, to a load, electric power obtained by conversion by the thermoelectric conversion element.

Abstract: A power sourcing equipment includes a laser oscillator and a modulator. The laser oscillator converts electric power into feed light. The modulator modulates, based on transmission information, a phase of the feed light output from the laser oscillator. The feed light phase-modulated by the modulator is output to outside of the power sourcing equipment. A powered device includes a photoelectric conversion element and a demodulator. The photoelectric conversion element converts feed light input from outside of the powered device into electric power. The demodulator detects a phase of the feed light to restore transmission information.

Abstract: A power sourcing equipment includes a laser oscillator and a modulator. The laser oscillator converts electric power into feed light. The modulator modulates, based on transmission information, a phase of the feed light output from the laser oscillator. The feed light phase-modulated by the modulator is output to outside of the power sourcing equipment. A powered device includes a photoelectric conversion element and a demodulator. The photoelectric conversion element converts feed light input from outside of the powered device into electric power. The demodulator detects a phase of the feed light to restore transmission information.

Abstract: A power over fiber system includes a power sourcing equipment, a powered device, an extender, and first and second optical fiber cables. The power sourcing equipment outputs feed light. The extender extends a laser wavelength of the feed light. The first optical fiber cable transmits the feed light from the power sourcing equipment to the extender. The second optical fiber cable transmits the feed light from the extender to the powered device. Based on a loss-to-transmission-length characteristic of the laser wavelength before extended by the extender and a loss-to-transmission-length characteristic of the laser wavelength after extended by the extender, the first optical fiber cable has a length that is equal to or shorter than a transmission length where a loss due to the laser wavelength before extended by the extender is equal to a loss due to the laser wavelength after extended by the extender.

Abstract: A powered device includes a photoelectric conversion element, a detector and a signal outputter. The photoelectric conversion element converts feed light into electric power. The detector detects a magnitude of the electric power being transmitted from the photoelectric conversion element to a load. The signal outputter outputs a detection signal of the detector to outside of the powered device. The detection signal is a signal indicating an envelope of a modulated wave that is output by the load.

Abstract: A powered device includes a photoelectric conversion element, a thermoelectric conversion element and a first power line. The photoelectric conversion element receives and converts feed light into electric power. The thermoelectric conversion element is disposed such that heat can be conducted thereto from the photoelectric conversion element. The first power line transmits, to a load, electric power obtained by conversion by the thermoelectric conversion element.

Abstract: An optical transmission system includes light supply devices, light receiving devices, an optical fiber cable, an electric power combiner and a data processing unit. MIMO communication is performed by the light receiving devices receiving signal beams having signals different from one another, output from the light supply devices and transmitted through a single core or cladding of the optical fiber cable. The signal beams are feed beams. The light supply devices output the feed beams with signals different from one another superimposed thereon by modulation. The light receiving devices convert the feed beams transmitted thereto into electric powers. The electric power combiner combines the electric powers obtained by the conversion. The data processing unit obtains signals superimposed on the feed beams received by the light receiving devices, and based on the obtained signals, obtains the signals superimposed by the light supply devices on the feed beams.

Abstract: A powered device includes a photoelectric conversion element, a detector and a signal outputter. The photoelectric conversion element converts feed light into electric power. The detector detects a magnitude of the electric power being transmitted from the photoelectric conversion element to a load. The signal outputter outputs a detection signal of the detector to outside of the powered device. The detection signal is a signal indicating an envelope of a modulated wave that is output by the load.

Abstract: An optical transmission system includes light supply devices, light receiving devices, an optical fiber cable, an electric power combiner and a data processing unit. MIMO communication is performed by the light receiving devices receiving signal beams having signals different from one another, output from the light supply devices and transmitted through a single core or cladding of the optical fiber cable. The signal beams are feed beams. The light supply devices output the feed beams with signals different from one another superimposed thereon by modulation. The light receiving devices convert the feed beams transmitted thereto into electric powers. The electric power combiner combines the electric powers obtained by the conversion. The data processing unit obtains signals superimposed on the feed beams received by the light receiving devices, and based on the obtained signals, obtains the signals superimposed by the light supply devices on the feed beams.

Abstract: A power over fiber system includes a power sourcing equipment, a powered device, an extender, and first and second optical fiber cables. The power sourcing equipment outputs feed light. The extender extends a laser wavelength of the feed light. The first optical fiber cable transmits the feed light from the power sourcing equipment to the extender. The second optical fiber cable transmits the feed light from the extender to the powered device. Based on a loss-to-transmission-length characteristic of the laser wavelength before extended by the extender and a loss-to-transmission-length characteristic of the laser wavelength after extended by the extender, the first optical fiber cable has a length that is equal to or shorter than a transmission length where a loss due to the laser wavelength before extended by the extender is equal to a loss due to the laser wavelength after extended by the extender.

Abstract: A power over fiber system transmits feed light and signal light through an optical fiber. The optical fiber includes a first transmission path and a second transmission path. The first transmission path is a core or a cladding, and the second transmission path is a cladding located on a periphery of the first transmission path. The feed light propagates through the first transmission path, and the signal light propagates through the second transmission path.

Abstract: A power over fiber system transmits feed light and signal light through an optical fiber. The optical fiber includes a first transmission path and a second transmission path. The first transmission path is a core or a cladding, and the second transmission path is a cladding located on a periphery of the first transmission path. The feed light propagates through the first transmission path, and the signal light propagates through the second transmission path.

Abstract: A communication device according to the present invention which receives a reception signal, includes: an intermodulation oscillator that outputs a signal of a first frequency; an adding section that adds together the reception signal and the signal of the first frequency; an intermodulation wave generating section that generates an intermodulation wave signal from the reception signal and the signal of the first frequency that are added together; a local oscillator that outputs a local signal; a mixer that generates an intermediate frequency signal by mixing the local signal into the intermodulation wave signal; a bandpass filter that extracts a signal of a desired frequency from the intermediate frequency signal; a voltage level detection section that detects a voltage level of a desired signal; and a control section that causes the intermodulation oscillator to output the signal of the first frequency when the voltage level of the desired signal is greater than a saturation level of the receiving section,

Abstract: A communication device according to the present invention which receives a reception signal, includes: an intermodulation oscillator that outputs a signal of a first frequency; an adding section that adds together the reception signal and the signal of the first frequency; an intermodulation wave generating section that generates an intermodulation wave signal from the reception signal and the signal of the first frequency that are added together; a local oscillator that outputs a local signal; a mixer that generates an intermediate frequency signal by mixing the local signal into the intermodulation wave signal; a bandpass filter that extracts a signal of a desired frequency from the intermediate frequency signal; a voltage level detection section that detects a voltage level of a desired signal; and a control section that causes the intermodulation oscillator to output the signal of the first frequency when the voltage level of the desired signal is greater than a saturation level of the receiving section,

Abstract: A base station includes an adaptive control unit for obtaining weights (w1? to w4?) of antenna elements indicating an arrival direction of an interference signal detected on a radio channel that is not being used for communication, and weights (w1 to w4) indicating an arrival direction of a desired signal arriving from a mobile station. The base station further includes an interference signal suppressibility determining unit for determining, based on the weights (w1 to w4) and the weights (w1? to w4?), whether or not it is possible to form a direction pattern that directs a main beam toward the arrival direction of the desired signal and directs a null toward the arrival direction of the interference signal; and a channel allocation unit for determining, based on a result of the determination, whether to allocate the mobile station the radio channel on which the interference signal is detected.