Fujikura Patente

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

A crosstalk measurement device (1) for an optical device including a core (11) and a core (12) that each include one end and other end and are parallel to each other, the crosstalk measurement device including a connection optical fiber (51) optically connecting the other end (18) of the core (11) and the other end (18) of the core (12), an optical component provided closer to the core (11) than a midpoint (C) of the connection optical fiber (51), the optical component having a larger loss of light incident from the core (11) side toward the core (12) side than a loss of light incident from the core (12) side toward the core (11) side, an OTDR (20) that causes incident light to enter from the one end (17) of the core (11), and measures power of emitted light emitted from the one end (17) of the core (11), the emitted light including crosstalk light (CL1) generated by crosstalk of the incident light from the core (11) to the core (12), and a processing unit (25) that obtains a magnitude of crosstalk between the core (11) and the core (12) by using the measured power of the emitted light.

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

A sub-array antenna device includes an antenna array formed by a plurality of sub-arrays including a plurality of radiating elements, an IC that supplies RF signals to the plurality of sub-arrays, and a substrate on which the plurality of sub-arrays and the IC are provided. The sub-array antenna device is capable of tilting a peak direction of electromagnetic waves radiated from the antenna array with respect to a direction orthogonal to the substrate.

Zusammenfassung wird geladen …

A power detector according to an aspect of the present invention includes a main current mirror circuit that outputs a detection current indicating power of a high-frequency signal from an output end, a reference current mirror circuit that is the same as the main current mirror circuit, a current mirror circuit for connection that has an input end connected to an output end of the reference current mirror circuit and has an output end connected to the main output end to output a reference current, and a differential amplifier that generates a power detection signal based on an input voltage of an initial-stage transistor, to which the high-frequency signal is input, in the main current mirror circuit and an input bias voltage of a corresponding transistor, which corresponds to the initial-stage transistor, in the reference current mirror circuit, in which the input bias voltage of the initial-stage transistor in the main current mirror circuit is set based on a first reference current, and the input bias voltage of the corresponding transistor in the reference current mirror circuit is set based on a total current of a deviation current between the detection current and the reference current and a second reference current.

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

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.

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

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.

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.

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).

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …