Abstract: A digital phase shifter includes a bend-type connection portion configured to connect a first digital phase shift circuit located at an end of a first digital phase shift circuit group and a second digital phase shift circuit located at an end of a second digital phase shift circuit group and include a third digital phase shift circuit. A capacitor is connected in parallel to at least one of a first connection line of a first connection portion, a first connection line of a second connection portion, a region in a vicinity of a connection position between two digital phase shift circuits constituting a first digital phase circuit group, and a region in a vicinity of a connection position between two adjacent digital phase shift circuits constituting a second digital phase circuit group.

Abstract: A ferrule holding structure includes a ferrule into which an optical fiber is inserted from a rear end of the ferrule to a connection surface at a front end of the ferrule and that holds the optical fiber, a biasing member that biases the ferrule in a forward direction from the rear end toward the connection surface, a housing that accommodates the biasing member and at least a part of the ferrule, and a support member that engages with the housing and that supports a rear end side of the biasing member. The support member includes a guide portion that guides the support member into the housing in an intersecting direction and a pressing face that presses the biasing member in the forward direction along with a movement of the support member in the intersecting direction to a position where the support member engages with the housing.

Abstract: An optical fiber cable including an optical fiber ribbon in a pipe, wherein the ribbon includes at least two optical fibers arranged side by side, and wherein at least two of the optical fibers are bonded intermittently along a length of the fibers.

Abstract: A ferrule holding structure includes an optical fiber, a ferrule into which the optical fiber is inserted from a rear end of the ferrule to a connection surface at a front end of the ferrule and that holds the optical fiber, a biasing member biasing the ferrule in a forward direction from the rear end toward the connection surface, a housing accommodating the biasing member and at least a part of the ferrule, a support member engaged with the housing and supporting a rear end side of the biasing member, and a rotation mechanism, structured with a part of the support member and a part of the housing, that rotatably attaches the support member to the housing. The support member includes a pressing surface that presses the biasing member in the forward direction along with a rotation of the support member with respect to the housing.

Abstract: An active element-doped optical fiber includes: a core that includes first and second regions. The first region ranges from a central axis to a predetermined radius, and is doped with an active element excited by excitation light. The second region surrounds the first region with no gap, extends to an outer peripheral surface of the core, and is not doped with the active element. The core satisfies 0.1 d<ra<d, where ra is a radius of the first region and d is a radius of the core. The core has, in a region of 0.2 d<r?0.9 d, a maximum value position at which a refractive index becomes maximum, where r is a distance from a central axis of the core in a radial direction.

Abstract: A digital phase shifter includes a first row, a second row arranged to extend in parallel to the first row, and a connection unit electrically connecting one ends of the first and second rows. Each of the first and second rows is configured by connecting a plurality of digital phase shift circuits in cascade, and each digital phase shift circuit includes an outer line and the like. For the digital phase shift circuits adjacent to each other in each of the first and second rows, outer lines adjacent to each other are separated, a first ground conductor and a second ground conductor adjacent to each other are separated, and positional relationships of the outer line to a signal line are reversed. A plurality of the outer lines included in the first row are not adjacent to a plurality of the outer lines included in the second row.

Abstract: A fiber assembly includes multi-core fibers each having a first end and a second end. The first end and the second end are distinguishable from each other. The multi-core fibers are bundled such that: the first end of one of the multi-core fibers is closer to a first end of the fiber assembly than to a second end of the fiber assembly, and the second end of another of the multi-core fibers is closer to the first end of the fiber assembly than to the second end of the fiber assembly.

Abstract: A digital phase shifter (100) includes a bend-type connection unit (e.g., a connection unit (20-1)) connecting a first digital phase shift circuit (e.g., a digital phase shift circuit (10-10)) located at an end portion of a first digital phase shift circuit group and a second digital phase shift circuit (e.g., a digital phase shift circuit (10-11)) located at an end portion of a second digital phase shift circuit group, and a capacitor (50) is connected in parallel to at least one of a first connection line of the connection unit (20), a position in the vicinity of a connection position between signal lines of two adjacent digital phase shift circuits (10) constituting the first digital phase shift circuit group, and a position in the vicinity of a connection position between signal lines of two adjacent digital phase shift circuits (10) constituting the second digital phase shift circuit group.

Abstract: A digital phase shift circuit including a first ground conductor connected to one end of each of the two inner lines and the two outer lines, a second ground conductor connected to the other end of each of the two outer lines, and two electronic switches, one thereof being provided between the other end of one of the two inner lines and the second ground conductor, the other thereof being provided between the other end of the other of the two inner lines and the second ground conductor, the first ground conductor being configured of a plurality of conductive layers; and an output circuit including an output signal line connected to the signal line and configured to increase output impedance as compared with that of an input matching load connected to an input stage of the digital phase shift circuit.

Abstract: In an array antenna device, a third power supply line includes an extension portion, a first branch line overlapping a first slot and a second branch line overlapping a second slot in a plan view, the first branch line and the second branch line branching from an extension portion. The length of the first branch line up to the first slot is equal to the length of the second branch line up to the second slot. In a plan view, a direction in which a tip end portion of the first branch line enters the first slot is opposite to a direction in which the extension portion extends in the first direction. In a plan view, a direction in which a tip end portion of the second branch line enters the second slot is opposite to a direction in which the extension portion extends in the first direction.

Abstract: A cleaning tool includes a head, a take-up reel, a driven roller, and a passthrough component. The head presses a cleaning element, having a tape shape, onto an optical connector. The take-up reel reels the cleaning element retrieved from the head. The driven roller guides the cleaning element on a convey path from the head to the take-up reel. The pass-through component includes a slit through which the cleaning element is extended, and the pass-through component is located between the driven rollers and the take-up reel.

Abstract: The power splitter-combiner (1) includes one combining terminal (11), two split terminals (12a, 12b), an absorption resistance (13) connected between the two split terminals, a first transmission line (14a) connected between the combining terminal and one split terminal of the two split terminals, a second transmission line (14b) connected between the combining terminal and the other split terminal of the two split terminals and having a length shorter than that of the first transmission line, and at least one first open stub (15) connected to the second transmission line.

Abstract: A phased array antenna module includes an analog circuit portion that adjusts at least one of an intensity and a phase of a signal transmitted or received by each of a plurality of antenna elements, a digital control portion that controls the analog circuit portion, a strobe mechanism portion that is provided between the analog circuit portion and the digital control portion, latches a control signal output from the digital control portion when a strobe latch signal is input, and outputs the control signal to the analog circuit portion, a state determination portion that determines whether or not the control signal is in a fixed state, and a timing adjustment portion that outputs the strobe latch signal to the strobe mechanism portion when a ready signal is output from the state determination portion.

Abstract: A superconducting wire includes: a superconductor laminate including a metal substrate and an oxide superconducting layer; and a stabilizing portion that covers the superconductor laminate and that has a thermal expansion coefficient larger than a thermal expansion coefficient of the metal substrate. The superconductor laminate has: a first main surface on which the oxide superconducting layer is disposed, and a second main surface on which the metal substrate is disposed. The stabilizing portion includes: a first portion facing the first main surface; and a second portion facing the second main surface. A thickness of the second portion is larger than a thickness of the first portion.

Abstract: An optical memory includes a support and nanoparticles, each of which changes between a crystal phase and an amorphous phase when irradiated with light. The nanoparticles are supported by the support and spaced apart from each other in one or both of an in-plane direction of a face of the support and a direction normal to the face of the support.

Abstract: An optical connection structure includes a substrate, an optical integrated circuit, including a reception/emission portion that receives and emits an optical signal, that is electrically connected to the substrate, a microlens array including a first lens disposed at a position corresponding to the reception/emission portion, a ferrule including a fiber hole into which an optical fiber is inserted and a second lens into which an optical signal from the optical fiber is input, and a receptacle that holds the ferrule. The optical integrated circuit and the receptacle are fixed to the microlens array. The second lens faces the first lens when the receptacle holds the ferrule.

Abstract: An optical fiber measurement device includes a light source, a light detector, a direction-changing member, and a tension-applying member. The light source emits light toward an optical fiber. The light detector receives the light that has propagated through the optical fiber. The optical fiber is hung on the direction-changing member. The direction-changing member changes an extending direction of the optical fiber to extend downward, the optical fiber being optically connected to the light source and the light detector at each of two end parts of the optical fiber. The tension-applying member applies a tension to the optical fiber hanging from the direction-changing member.

Abstract: A temperature measuring device includes a heat pipe having a container in which a working fluid is enclosed, a temperature sensor that detects a temperature of the heat pipe, and a wire portion connected to the temperature sensor, in which the heat pipe receives heat from a plurality of heat sources.

Abstract: An optical computing device includes an optical modulation element group including optical modulation elements. The optical modulation element group executes first optical computing with respect to a first signal light traveling along an optical path and second optical computing with respect to a second signal light traveling along the optical path in a direction opposite to a traveling direction of the first signal light.

Abstract: A bobbin for winding optical fiber includes: a body around which an optical fiber is wound; a flange that extends in a radial direction from the body; and a seal that is bonded to an axially outer side surface of the flange. The flange has a void penetrating the flange. A part of the seal covers at least a part of the void. At least a part of a portion of the seal is non-adhesive. The portion covers the void.