Fujikura Patente

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A multicore fiber (1) includes two to four core elements (10) each including a core (11) and a trench layer (13) that surrounds an outer circumferential surface of the core (11), and a cladding (20) that surrounds the outer circumferential surface of each core element (10) without any gap. The diameter of the core element (10) is equal to or smaller than a size smaller by 1 µm than a core pitch A between the core element (10) and another core element (10) adjacent thereto at a shortest distance, the mode field diameter of light that propagates through the core (11) is 8.2 µm or more and 8.8 µm or less, and a trench volume TV that is a product of a cross-sectional area of the trench layer (13) in a cross section perpendicular to the longitudinal direction of the cladding (20) and a relative refractive index difference of the trench layer (13) with respect to the cladding (20) is 105 µm²% or more and 350 µm²% or less.

An optical connector cleaning tool 1 includes a cleaning shaft 20, a feeding bobbin 33, a winding bobbin 31, a support body 40, a case 60, the rotation mechanism 91 that rotates the cleaning shaft 20 around a rotation axis RA in accordance with a relative movement of the support body 40 with respect to the case 60, and a gear 32 attached to the winding bobbin 31, the cleaning shaft 20 includes a supply port 252 and a collection port 253, and the rotation mechanism 91 rotates the cleaning shaft 20 around the rotation axis RA so that the collection port 253 moves away from the gear 32 when the relative movement of the support body 40 with respect to the case 60 starts.

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A fiber laser device includes: a first amplification optical fiber (61); a first FBG (51) and a second FBG (52) sandwiching the first amplification optical fiber (61); a second amplification optical fiber (62) disposed on the opposite side of the second FBG (52) from the first amplification optical fiber (61); a first pumping light source (11) that introduces pumping light into the first amplification optical fiber from the side of the first FBG (51); and a second pumping light source (12) that introduces pumping light into the second amplification optical fiber (62) from the opposite side from the second FBG (52), in which the concentration of an active element added to the core of the second amplification optical fiber (62) is higher than the concentration of an active element added to the core of the first amplification optical fiber (61), and part of the pumping light from the first pumping light source (11) passes through the first amplification optical fiber (61) and propagates to the second amplification optical fiber (62).

Provided is a fiber laser and the like in which occurrence of a giant pulse is suppressed. A fiber laser (1) includes an MO section (11), a PA section (12), a voltage detection section (12b3), and a control section (12b2). The PA section (12) includes an optical fiber (12a), a pumping light source (LD), a capacitor (C), and a switch (SW2). The voltage detection section (12b3) detects a voltage of a direct-current power supply (PS) which supplies an electric current to the MO section (11) and the pumping light source (LD). The control section (12b2) carries out control to open the switch (SW2) in response to a transition from a state where the voltage detected by the voltage detection section (12b3) is higher than a predetermined threshold to a state where that voltage is lower than the threshold.

The optical connector cleaning tool 1 includes a cleaning unit 10 including: a cleaning head 21 that includes a pressing surface 221 and that holds a cleaning element 5 so that the cleaning element 5 is turned back at the pressing surface 221 that presses the cleaning element 5 against a connection end surface 811 of the optical connector 80; a shaft member 26 that supports the cleaning head 21 so that the cleaning head 21 is relatively movable with respect to the shaft member 26; and bobbins 31 and 32 that supplies and collects the cleaning element 5 to and from the pressing surface 221, a guide nozzle 50 that accommodates the cleaning unit 10 so that the cleaning unit 10 is relatively movable with respect to the guide nozzle 50 and that has a front end portion 51 through which the cleaning head 21 can protrude and retract, and a rack gear 52 and a pinion gear 23 that drives the bobbins 31 and 32 in accordance with a relative movement of the cleaning unit 10 with respect to the guide nozzle 50.

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According to the present invention, an antenna substrate includes a core layer, a first buildup layer laminated on one surface of the core layer and a second buildup layer laminated on the other surface of the core layer. An antenna is formed on the first buildup layer. A high-frequency integrated circuit (IC) is mounted on the second buildup layer. A ground layer formed away from the antenna in a thickness direction and a power-supply wiring layer formed on an opposite side of the antenna with respect to the ground layer in the thickness direction are provided in an inner layer of the core layer. The core layer includes a first through-hole via configured to pass through the core layer in the thickness direction from the one surface to the other surface and electrically connect the power-supply wiring layer and the high-frequency integrated circuit (IC).

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