Abstract: The embodiment relates to an optical connection component including a bent optical fiber having a bent portion including a region where a curvature of the bent portion is maintained at 0.4 [l/mm] or more while substantially no bending stress remains. The bent optical fiber comprises a core, a first cladding, a second cladding, and a third cladding. Based on the third cladding, a relative refractive index difference ?1 of the core, a relative refractive index difference ?2 of the first cladding, and a relative refractive index difference ?3 of the second cladding satisfy relationships of ?1>?2>?3 and ?3<?0.5[%]. The product V3 of the ?3 and a cross-sectional area S of the second cladding is less than ?200[%·?m2]. The curvature in the bent portion is 0.6 [l/mm] or less over an entire length of the bent portion.

Abstract: The present embodiment achieves effective height reduction of an entire optical connection component constituted by a bent optical fiber and a fiber fixing component. The fiber fixing component includes a first portion and a second portion which constitute the holding portion in a state of being arranged in a manner interposing an installation plane in order to hold one of non-bent sections positioned at both ends of a bent portion in a state where the one of non-bent sections is arranged on the installation plane. Total lengths of the first portion and the second portion are different from each other, and effective height reduction of the entire optical connection component can be achieved by arranging the bent portion in a stepped portion formed by the total length difference.

Abstract: One or more embodiments of an operation table may include a table on which a patient is to be placed; a base fixed on a floor; and a robot arm comprising joints, a first end supported by the base, and a second end supporting the table, wherein the robot arm takes a first posture in which the robot arm is stored in a storage space that is a space under the table when the table is positioned at a first position, and the robot arm moves the table to a second position which is away from the first position by taking a second posture in which at least part of the robot arm horizontally protrudes from the storage space.

Abstract: There is provided a method for producing a low-loss alkali metal-doped silica core optical fiber having excellent hydrogen resistance. The method for producing the optical fiber according to the present invention includes a drawing step of drawing an optical fiber preform in a drawing furnace to produce a silica glass-based optical fiber including a core region containing an alkali metal with an average concentration of 0.5 atomic ppm or more and a cladding region that surrounds the core region and a heating step of heating the optical fiber in a heating furnace through which the optical fiber drawn from the drawing furnace passes.

Abstract: The present embodiment relates to a method of directly measuring a leakage loss from a peripheral core in a MCF with a coating to the coating. In the measurement method, in a high refractive-index state in which the coating is present on an outer periphery of a common cladding, first transmission power of measurement light, which propagates through the peripheral core of the MCF, is measured. On the other hand, in a low refractive-index state in which a low-refractive-index layer with a lower refractive index than the common cladding is provided on the outer periphery of the common cladding, second transmission power of the measurement light, which propagates through the peripheral core of the MCF, is measured. The leakage loss LL from the peripheral core to the coating is calculated as a difference between the first transmission power and the second transmission power.

Abstract: An embodiment of the invention enables each core in an end face to be readily identified by observation of either one end face, regardless of the presence or absence of a twist of a pertinent MCF and difference of ends. In a cross section of the MCF, a core group constellation has symmetry but each core in a core group is identifiable by breaking of all types of symmetry in a common cladding, defined by a combination of the core group constellation with the common cladding, or, by making the fiber ends distinguishable.

Abstract: One or more embodiments provide medical tool grip mechanism to which multiple types of medical instruments can be attached. A grip mechanism grips an instrument. The instrument has a shaft extending in a longitudinal direction, a treatment tool arranged at a distal end of the shaft, and a treatment tool control portion that is arranged at a proximal end of the shaft and controls the treatment tool. The grip mechanism has a gripping portion. The gripping portion grips the treatment tool control portion such that the treatment tool control portion is rotatable about a rotational axis extending in the longitudinal direction of the shaft, and movable in the longitudinal direction with respect to the shaft.

Abstract: The present embodiment relates to a method of directly measuring a leakage loss from a peripheral core in a MCF with a coating to the coating. In the measurement method, in a high refractive-index state in which the coating is present on an outer periphery of a common cladding, first transmission power of measurement light, which propagates through the peripheral core of the MCF, is measured. On the other hand, in a low refractive-index state in which a low-refractive-index layer with a lower refractive index than the common cladding is provided on the outer periphery of the common cladding, second transmission power of the measurement light, which propagates through the peripheral core of the MCF, is measured. The leakage loss LL from the peripheral core to the coating is calculated as a difference between the first transmission power and the second transmission power.

Abstract: The present embodiment relates to an MCF having a low transmission loss and having a structure for reducing a transmission loss and effectively suppressing an inter-core XT. The uncoupled MCF includes alkali metal having a predetermined concentration in which each of a plurality of cores contributes to reduction in the transmission loss, and a core pitch is set so that a sum h_total of power coupling coefficients of a specific core and the remaining all cores of the plurality of cores is 2.3×10?4/km or less.

Abstract: Light output from a light source is distributed to intensity modulators that are associated with different spatial modes and that have different modulation conditions. An operation for receiving modulated light from each of the intensity modulators is performed for SDM fibers of different lengths while the light source is in operation, and pieces of optical power information are determined for respective spatial modes to be measured, from difference information regarding the lengths and the received optical powers.

Abstract: Light output from a light source is distributed to intensity modulators that are associated with different spatial modes and that have different modulation conditions. An operation for receiving modulated light from each of the intensity modulators is performed for SDM fibers of different lengths while the light source is in operation, and pieces of optical power information are determined for respective spatial modes to be measured, from difference information regarding the lengths and the received optical powers.

Abstract: The present embodiment relates to a CMCF including a structure to achieve more efficient reduction in transmission loss by suppressing decrease in concentration of alkali metal due to diffusion of alkali metal. In the CMCF including a plurality of cores, a power coupling coefficient h between adjacent cores is set to 1×10?3/m or more, to maintain an optical coupling state between the adjacent cores. In addition, alkali metal contributing to reduction in transmission loss is added to each of the cores such that a stress maximum value ?_max between adjacent cores has a negative value.

Abstract: An embodiment relates to a method for manufacturing an optical module having an MCF and two connection components, and enables rotational alignment of the MCF to be implemented with high accuracy even in short-haul optical wiring. The MCF is arranged in a region between the two connection components while an end thereof projects from one connection component. As this arrangement state is maintained, array positions of cores in the projecting end are observed from a side face and the MCF is rotationally aligned by a rotation grasp jig grasping the projecting end to adjust the array positions of the cores, based on the observation result.

Abstract: A remote control apparatus may transmit, to a surgical manipulator, a movement type instruction to be executed by the surgical manipulator. The apparatus may comprise a movable operating handle positioned within an operation area. The movable operating handle may receive the movement type instruction. The apparatus may further comprise a support mechanism that supports and transforms the operating handle between a first posture in which the operating handle at a center position of the operation area is positioned and held at a first vertical position located at a height of 85 centimeters or more from a floor surface where the remote control apparatus is placed, and a second posture in which the operating handle is shifted down by 48 centimeters or more from the first vertical position to a second vertical position at which the operating handle at the center position of the operation area is positioned and held.

Abstract: Disclosed is a medical robot system including medical robots placed at different locations and a data analysis apparatus. Each of the medical robots includes a controller that transmits data on a state of operation of the medical robot to the data analysis apparatus. The data analysis apparatus includes a data analysis unit that generates a reference for determining whether or not the medical robots are normal, based on the data transmitted from the medical robots. The data analysis unit monitors the data transmitted from each of the medical robots in operation based on the reference.

Abstract: An embodiment of the invention relates to a bent optical fiber manufacturing method for manufacturing a bent optical fiber in which a bent region with a desired radius of curvature is formed, while maintaining an optical transmission loss within a permissible range. The method has a pre-step of preparing an optical fiber comprised of silica-based glass, a bend portion forming step of forming a bend portion in a partial region of the optical fiber, and a laser light irradiating step of irradiating the thus-formed bend portion with laser light.

Abstract: The present invention relates to an MCF and others with a structure for accurately aligning each of core arrangement directions of one or more MCFs to be fixed in a connector. Each of the MCFs has a marker as an index for rotational position. The ends of the MCFs are rotated while monitoring positions of the respective markers with a CCD camera or the like, whereby each of the core arrangement directions is aligned with a specific direction.