Abstract: An object of the present invention is to provide an ultraviolet light irradiation system and an ultraviolet light irradiation method, each of which is capable of reducing deterioration over time of transmission loss characteristics of an optical fiber due to ultraviolet rays and preventing a decrease in ultraviolet ray irradiation power.

Abstract: An object of the present invention is to provide an ultraviolet light irradiation system and an ultraviolet light irradiation method which can perceive a state of a region where ultraviolet light is irradiated to output/block the ultraviolet light. An ultraviolet light irradiation system 301 according to the present invention includes an ultraviolet light source unit 11 that produces ultraviolet light, an N (N is a natural number) irradiation unit 13 that irradiates an irradiation target region Ar with the ultraviolet light, a sensor unit 31 that detects whether or not an object that should avoid exposure is present in the irradiation target region Ar, and a blocking unit 30 that stops, in a case where the object that should avoid exposure is present in the irradiation target region Ar, irradiation of the ultraviolet light from the irradiation unit 13 to the irradiation target region Ar.

Abstract: An object of the present disclosure is to reduce transmission loss deviation between ports in an optical cross-connect device using a rotary optical switch. The present disclosure is an optical cross-connect device in which optical switches for switching a plurality of optical paths using optical fibers are connected to each other using optical paths, the optical switch collectively switches the plurality of optical paths using a rotating body, and the optical cross-connect device includes: a cross wiring part which connects an optical path having a large loss in one of the optical switches among the plurality of optical paths which are switched collectively and an optical path having a small loss in the other optical switch of the plurality of optical paths which are switched collectively to an optical path connecting the optical switches to each other.

Abstract: An object of the present disclosure is to provide a simple, compact optical switch with low power consumption.

Abstract: An objective of the present disclosure is to provide an optical coupler and an optical switch capable of achieving stable optical characteristics with low power consumption and more economical efficiency with respect to external factors.

Abstract: An object of the present disclosure is to enable monitoring of signal light transmitted through an optical cross-connect apparatus to be achieved with low loss and economically, in the optical cross-connect apparatus using a plurality of optical switches connected thereto. The present disclosure relates to an optical cross-connect apparatus including a plurality of optical path switching means on input/output sides, in which the optical path switching means includes two multi-core optical fibers having different core arrangements, optical coupling between cores of the two multi-core optical fibers is switchable by rotation of at least one of the two multi-core optical fibers, and a first multi-core optical fiber of the two multi-core optical fibers includes a first core that transmits signal light propagated by optical coupling between the cores of the two multi-core optical fibers, and a second core that propagates leakage light of the signal light.

Abstract: An object of the present disclosure is to enable a plurality of single-core fibers to be easily and collectively connected. The present disclosure relates to a cylindrical multi-core ferrule having a cylindrical shape and having through holes formed therein for holding a plurality of optical fibers on the same circle centered on a central axis of the cylindrical shape and an optical connector in which the cylindrical multi-core ferrule are disposed opposite to each other and a gap is formed between end surfaces of an optical fiber held by the cylindrical multi-core ferrule.

Abstract: The disclosure provides a monitoring control device and an optical power supply system in which a system capable of remotely controlling many optical power supply type optical nodes can be economically constructed. A monitoring control device according to the present disclosure includes control means for executing power supply and power supply time allocation for selecting a control target optical node based on the amount of stored energy of a plurality of optical nodes. According to the present disclosure, in a system that includes a monitoring control device installed in a power supply environment and one or a plurality of remotely arranged optical line switching nodes, optical power supply and control of a plurality of optical switches included in the nodes and management of an amount of stored power can be simultaneously implemented with a single laser. Thus, it is possible to provide an economical optical line switching node system.

Abstract: The present disclosure has an object to provide a multicore optical connector that can achieve size reduction and pitch reduction without performing highly accurate machining of V-grooves or the like. The present disclosure is a multicore optical connector including a holding member 11 having a flat bottom surface 14B, and provided with a groove that enables a plurality of optical fibers 91 to be arranged along the bottom surface 14B, the plurality of optical fibers 91 stored in a row on the bottom surface of the groove, and a lid 15 that is in contact with all the plurality of optical fibers 91 and is fixed to the plurality of optical fibers 91 and the holding member 11 in a state in which the plurality of optical fibers 91 are pressed against the bottom surface 14B of the groove to form a long hole 12 at the groove 14.

Abstract: An object is to provide an optical connector cleaning tool capable of simultaneously and appropriately cleaning an end surface and a side surface of a ferrule of an optical connector plug. The optical connector cleaning tool according to the present invention includes an end surface cleaning section including a cleaning sheet for cleaning a ferrule end surface of an optical connector plug, a side surface cleaning section including a cleaning thread bundle (or cleaning sheet) for cleaning a ferrule side surface of the optical connector plug, and a mechanism that reveals a new cleaning sheet and a new cleaning thread bundle (or cleaning sheet) at a predetermined position after each cleaning operation.

Abstract: An object of the present disclosure is to alleviate deterioration of transmission characteristics of a fiber due to transmission of ultraviolet light, and to eliminate complication of operation due to frequent replacement of an optical fiber in which deterioration has occurred. The present disclosure is an ultraviolet light irradiation system including: an optical transmission unit that propagates ultraviolet light using a plurality of optical transmission lines; an ultraviolet light source unit that inputs ultraviolet light to each of the optical transmission lines with arbitrary power; and an irradiation unit that irradiates a target location with the ultraviolet light propagated through the plurality of optical transmission lines.

Abstract: An object of the present invention is to provide an ultraviolet light irradiation system and an ultraviolet light irradiation method which are not limited in an ultraviolet light irradiation region and can be introduced economically. The present ultraviolet light irradiation system is a system configured to connect a single ultraviolet light source part and an irradiation part installed in the vicinity of an object place to be sterilized or the like by the optical cable formed by bundling a plurality of optical fibers (the single-core or the multi-core) or the multi-core optical fiber. Since the optical fiber is very thin and does not require power supply for transmitting the ultraviolet rays, even in a fine place where a person or a robot cannot enter, the ultraviolet light can be irradiated by laying the optical fiber or the optical cable.

Abstract: The present disclosure aims to provide an optical switch that has low power consumption, and can achieve stable optical characteristics to cope with external factors with a mechanism that does not require any complicated assembly process.

Abstract: An object of the present invention is to provide a light irradiation system capable of securing economic efficiency, flexibility, reliability, and safety, and further capable of reducing a transmission loss between a center side and a remote side. The present light irradiation system can secure economic efficiency by sharing a single light source installed on the center side with a plurality of irradiation places. The present light irradiation system can irradiate a place to be sterilized with ultraviolet light output by moving the optical fiber tip end on the remote side in a pinpoint manner, and can also secure flexibility. In addition, the present light irradiation system can secure reliability and safety by performing output control of the light source on the center side.

Abstract: In order to solve the above problems, an object of the present invention is to provide an ultraviolet light irradiation system and an ultraviolet light irradiation method with a few transmission losses in an optical fiber. The ultraviolet light irradiation system 301 includes: a light source unit 11 for injecting transmission infrared light into an optical fiber 50, a wavelength conversion unit 12 for converting the transmission infrared light propagated through the optical fiber 50 into ultraviolet light, and an irradiation unit 13 for irradiating the ultraviolet light on a desired place. The light source unit 11 has a polarization scrambler 11b, and infrared light output from one infrared light source 11a is made to be transmission infrared light by the polarization scrambler 11b.

Abstract: An object of the present invention is to provide an ultraviolet light irradiation system and a decontamination method that are economical and easy to operate, and that can perform decontamination without any input from a user. In the present invention, an optical fiber or an optical waveguide that radiates ultraviolet light in a lateral direction, the optical fiber or the optical waveguide is built in a sheet shape, and irradiates a surface with the ultraviolet light. Specifically, a material in which a material having a high scattering coefficient is added to the optical fiber is used, a grating is formed in the optical fiber, the optical fiber is given a minute bending with a minute ruggedness, and an arbitrary bending is given on the optical fiber, or the like, thereby achieving side radiation. By such a feature, it has the effect that ultraviolet light decontamination can be performed at all times or at necessary timing for an object touched by an unspecified number of people.

Abstract: An object of the present invention is to provide an ultraviolet light irradiation system and a decontamination method that can perform decontamination economically without any input from a user. The ultraviolet light irradiation system forms a linear or planar ultraviolet light irradiation space by spatially bundling a plurality of ultraviolet light beams with high energy density or moving the ultraviolet light with high energy density at high speed. The ultraviolet light irradiation system can decontaminate a human body and clothing simply by passing through the space. Further, since the ultraviolet light irradiation system performs decontamination in the space, bacteria and viruses emitted from a carrier are not passed through the space.

Abstract: An object is to provide a multifiber optical connector and an optical cable connection method capable of reducing a connection time and reducing an installation space of a connection portion. The multifiber optical connector according to the present invention includes three position adjustment units, and performs rough alignment to fine alignment of optical fiber end faces by using sequentially these position adjustment units when optical cables are connected. The multifiber optical connector simultaneously connects the end faces of the plurality of optical fibers included in the optical cables, and thus, an extra optical fiber tape is not present, and a closure needed in the related art is not necessary.

Abstract: An object is to provide an optical connector cleaning tool capable of cleaning both an end face and a side face of a ferrule of an optical connector plug simultaneously and simply and a method of cleaning an optical connector in such a manner. An optical connector cleaning tool according to the present invention includes superimposing a plurality of cleaning sheets on each other, the cleaning sheets each including a plurality of cleaning strings arranged so as to be parallel to each other in a sheet shape, such that orientations of the cleaning strings included in the respective cleaning sheets differ from each other, pressing an end face of a ferrule of an optical connector plug against the cleaning sheets to clean the end face of the ferrule, and subsequently, sticking the ferrule through the cleaning sheets to clean a side face of the ferrule.

Abstract: To provide a connector plug that makes it possible to facilitate a plurality of persons' confirmation of a connector plug before its removal or after its insertion and to prevent erroneous work. The connector plug according to the present invention has a discoloration member mounted on a gripping portion for pinching during work. The color of the discoloration member changes due to heat of a worker's fingertips when the worker pinches the connector plug or pressure when the worker pinches the connector plug. The discoloration member is discolored by one worker pinching the connector plug. Another worker looks at the discolored discoloration member, and then is able to confirm whether the connector plug is a work target.