Abstract: A reception device including a ball lens, light receivers, and a support column that movably supports the light receiver around the ball lens. The light receiver includes a substrate having a first face facing a ball lens and a second face facing the first face, the substrate having a through hole that penetrates the first face and the second face, integration light receiving elements disposed around the through hole on the first face of the substrate with a light reception part facing the ball lens, a light guide tube including a first opening end aligned with the through hole and a second opening end facing the first opening end, the light guide tube being disposed at the second face associated with the through hole, and a communication light receiving element disposed at the second opening end of the light guide tube with a light reception part facing the ball lens.

Abstract: A reception device that includes a first optical collector that collects an optical signal propagating in a space, a second optical collector that collects the optical signal collected by the first optical collector by compressing the optical signal in a second direction orthogonal to the first direction, a third optical collector that collects the optical signal collected by the second optical collector in a direction including at least the first direction, and a light-receiving element array including a plurality of light-receiving elements arranged along the first direction, the light-receiving element array receiving the optical signal collected by the third optical collector by at least one of the plurality of light-receiving elements.

Abstract: A communication system that includes a plurality of communication devices, each including a first transmission/reception unit that transmits and receives counterclockwise first circularly polarized optical signals as spatial optical signals and a second transmission/reception unit that transmits and receives clockwise second circularly polarized optical signals as spatial optical signals, in which the plurality of communication devices is arranged in such a way that, among the first transmission/reception units and the second transmission/reception units, transmission/reception units that transmit and receive circularly polarized optical signals rotating in the same direction face each other between each of the communication devices and another communication device that is a communication counterpart.

Abstract: Provided is a reception device that includes a ball lens that collects an optical signal propagating through a space, a light guide including a plurality of base-units annularly disposed around the ball lens, the light guide guiding the optical signal collected by the ball lens in a direction substantially perpendicular to an incidence direction of the optical signal, and a plurality of light receiving elements related to the plurality of respective base-units, the light receiving elements receiving the optical signal emitted from the base-units and outputting a signal derived from the received optical signal.

Abstract: A optical transmission device that includes a light source, a spatial light modulator including a modulation part where a plurality of modulation regions that is irradiated with light emitted from the light source is set, a wave plate disposed in an optical path of modulated light that is modulated in each of the modulation regions set in the modulation part of the spatial light modulator, the wave plate converting the modulated light that is modulated in each of the modulation regions to mutually different polarization states, and a curved surface mirror having a curved reflection surface irradiated with the modulated light that is converted to the mutually different polarization states, the curved surface mirror reflecting the modulated light converted to the mutually different polarization states at a projection angle in accordance with a curvature of the reflection surface.

Abstract: A optical transmission device comprising a light source, a spatial light modulator which has a modulation part onto which light emitted from the light source is radiated, and which modulates the phase of the radiated light by means of the modulation part, and a control unit which allocates modulation regions associated with respective communication targets to the modulation part of the spatial light modulator, configures, in each modulation region, a phase image for forming an image used in communication with the communication target in the position of the communication target, and controls the light source such that light is radiated onto the modulation part while the phase image is configured therein.

Abstract: A communication control device that causes a transmitting device to transmit a scanning signal of a pulse pattern different between a first period and a second period, specify a direction of transmission of the scanning signal transmitted from a communication target according to a reception interval between the pulse pattern of the scanning signal transmitted from the communication target in the first period and the pulse pattern of the scanning signal transmitted from the communication target in the second period in response to reception of the scanning signal transmitted from the communication target by a receiving device, and transmit a notification signal of the pulse pattern relevant to the specified direction of transmission of the scanning signal to a transmitting device toward the communication target.

Abstract: A projection device that includes a light source, a spatial light modulator including a modulation portion irradiated with a beam emitted from the light source, the spatial light modulator modulating a phase of the emitted beam in the modulation portion, a control unit that sets a phase image for forming a desired image in the modulation portion of the spatial light modulator, and controls the light source in such a way that the modulation portion, in which the phase image is set, is irradiated with the beam, and a curved mirror having a curved reflective surface irradiated with a modulated beam modulated by the modulation portion of the spatial light modulator, the curved mirror reflecting the modulated beam on the reflective surface, and projecting a projection beam having a projection angle enlarged according to a curvature of the reflective surface.

Abstract: A reception device that includes a ball lens that collects an optical signal propagating in a space, a light receiving element array that includes a plurality of light receiving elements that each receive the optical signal collected by the ball lens and outputs a signal derived from the optical signal received by each of the plurality of light receiving elements, and a reception circuit that decodes the signal output from the light receiving element array.

Abstract: A communication apparatus (10) includes: at least one communication means (21) that is configured to be capable of transmitting and receiving directional communication media; a provision means (22) that provides, to at least one communication destination with which to communicate by the at least one communication means, use information pertaining to a purpose of connection; an acquisition means (22) that from the at least one communication destination, acquires, as a response to the use information, related information related to the at least one communication destination; and a determination means (24) that determines connection/disconnection to/from the at least one communication destination with reference to the related information related to the at least one communication destination.

Abstract: A communication apparatus (10) according to an example aspect of the present invention includes: at least one communication means (21) that is configured to be capable of transmitting and receiving directional communication media; an acquisition means (22) that acquires related information related to at least one communication destination with which to communicate by the at least one communication means; and a determination means (23) that determines at least one connection destination with which to connect by the at least one communication means, the determination means referring to the related information related to the at least one communication destination, and determining, as the at least one connection destination, a communication destination that has more established connections.

Abstract: A receiving device includes a notification light transmitter that transmits notification light in a direction along a horizontal plane, a ball lens disposed below the notification light transmitter, a plurality of light receivers disposed in a condensing region of the ball lens and each including a first light receiving element that receives notification light transmitted from a communication target and a second light receiving element that receives communication light transmitted from the communication target, and a moving mechanism on which the ball lens is disposed and that movably supports the plurality of light receivers in accordance with the condensing region of the ball lens.

Abstract: Provided is a transmitter that includes a light source including a plurality of emitters, a spatial optical modulator including a modulating part in which a plurality of modulation regions to be irradiated with illumination light derived from light emitted from each of the plurality of emitters are set, and a reflector including a reflective surface that is irradiated with the modulated light modulated in each of the plurality of modulation regions and reflects the modulated light modulated in each of the plurality of modulation regions in a certain direction in a horizontal plane.

Abstract: Provided is a novel optical space communication apparatus which is capable of inferring a hindrance factor to communication carried out with laser light. An optical space communication apparatus includes light receiving sections that each receive laser light and at least one processor, the at least one processor carrying out: a measurement process of measuring light receiving states of laser light at the respective light receiving sections; a determination process; and an inference process of inferring, based on the light receiving states of laser light, a hindrance factor to communication carried out with laser light.

Abstract: A free-space optical communication apparatus control apparatus includes: a detecting section for detecting an impediment to laser communication of a free-space optical communication apparatus; and a judging section for judging, in accordance with the state of the impediment to the laser communication, whether pruning of a tree is necessary.

Abstract: A free-space optical communication apparatus includes: a light emission section; an optical phase modulation section; a light reception section; and at least one processor, the at least one processor carrying out: a communication control process of, by causing the light emission section to emit first communication light and causing the light reception section to receive second communication light from a communication counterpart, carrying out free-space optical communication with the communication counterpart; and a measurement control process of measuring a distance to a surrounding object by causing the light emission section to emit pulsed light and causing the light reception section to receive reflected light of the pulsed light.

Abstract: A light reception device includes a condenser lens that condenses a spatial light signal, a light reception unit including at least one light reception element of which a light reception part is disposed to face the condenser lens to receive an optical signal derived from the spatial light signal condensed by the condenser lens, and a reflection structure disposed in a dead region around the light reception part to reflect the optical signal condensed by the condenser lens toward the light reception part.

Abstract: A projection device includes a light source that emits parallel light, a spatial light modulator including a modulation part that modulates a phase of the parallel light emitted from the light source, a control unit that tiles the modulation part with tiles of at least two resolutions in which a phase image related to an image displayed by projection light being set, sets the phase image to each of the plurality of tiles that are tiled, and causes the light source to radiate the parallel light toward the modulation part in which the phase image is set; and, and a projection optical system that projects light modulated by the spatial light modulator as the projection light.

Abstract: A light-receiving device includes a condenser lens configured to condense a spatial optical signal, a variable lens in which a lens region is formed at an arbitrary position, the variable lens focusing an optical signal derived from the spatial optical signal condensed by the condenser lens in the lens region, a control unit configured to form the lens region at a desired position of the variable lens and control an emission direction of the optical signal emitted from the variable lens, and a light-receiving element that is disposed with a light-receiving part facing the variable lens and receives the optical signal focused by the variable lens.

Abstract: A reception device includes a ball lens, a first light receiver including a first annular body surrounding a periphery of the ball lens, and light receiving units including first light receiving elements disposed on an inner peripheral side surface of the first annular body, and a second light receiver including a second annular body surrounding an outer periphery of the first annular body and second light receiving elements disposed on an outer peripheral side surface of the second annular body. The first light receiving elements are disposed on the inner peripheral side surface of the first annular body with the light receiving part facing the ball lens. The second light receiving elements are disposed on the outer peripheral side surface of the second annular body with the light receiving part facing in a direction opposite to the ball lens.