SEI Optifrontier Co.

Japan

SEI Optifrontier Co.

Japan

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Patent
SEI Optifrontier Co. | Date: 2015-12-03

An optical fiber with a connector includes a first connector and a plurality of optical fibers attached to the first connector. The first connector includes: at least one fiber-shaped member; and a ferrule including a first end surface and a second end surface arranged in a first direction, and a holding portion holding the optical fibers and the fiber-shaped member. In the holding portion, a plurality of fiber insertion holes extending from the first end surface in the first direction is formed such that the optical fibers and the fiber-shaped member are insertable thereinto. One end of the optical fiber and one end of the fiber-shaped member are held by the holding portion in a state of being inserted into the fiber insertion hole. The optical fiber extends to the outside of the ferrule. The other end of the fiber-shaped member is located inside the ferrule.


Patent
SEI Optifrontier Co. | Date: 2017-07-19

An optical connector 1 is an optical connector connected to an external optical adapter. The optical connector 1 is provided with: an inner housing 3, in a surface of which engaging holes for engaging the optical adapter is provided; a boot 6 connected to the inner housing 3 on a side opposite the optical adapter in a forward/backward direction; and a first outer housing 4 and a second outer housing 5 covering the engaging holes and mounted on the inner housing 3 to be freely movable in the forward/backward direction. As the second outer housing 5 moves backward, the engaging holes of the inner housing 3 are exposed. The second outer housing 5 has cutout parts 5c which are cut out from a back end surface 5f in the forward direction and which a front end part of the boot 6 enters.


Patent
Sumitomo Electric Industries and SEI Optifrontier Co. | Date: 2016-04-13

An OCT catheter and a method for manufacturing the OCT catheter, with which the operation time, manufacturing cost, and the risk of breakage of a spliced portion between a short-length fiber and an optical fiber contained in an interior member can be reduced, are provided. An OCT catheter 1 A includes an interior member 10 that contains an optical fiber and that is to be inserted into a body, a metal tube 20 that guides the interior member 10, and an optical connector 30. The optical connector 30 includes a ferrule assembly including a short-length fiber and a ferrule fixed to one end of the short-length fiber, and is connectable to a rotary joint of an OCT system. The other end of the short-length fiber and one end of the optical fiber contained in the interior member 10 are fusion-spliced together to form a spliced portion. The spliced portion is disposed in the metal tube 20.


Patent
Sei Optifrontier Co. and Sumitomo Electric Industries | Date: 2014-05-29

An OCT catheter and a method for manufacturing the OCT catheter, with which the operation time, manufacturing cost, and the risk of breakage of a spliced portion between a short-length fiber and an optical fiber contained in an interior member can be reduced, are provided. An OCT catheter includes an interior member that contains an optical fiber and that is to be inserted into a body, a metal tube that guides the interior member, and an optical connector. The optical connector includes a ferrule assembly including a short-length fiber and a ferrule fixed to one end of the short-length fiber, and is connectable to a rotary joint of an OCT system. The other end of the short-length fiber and one end of the optical fiber contained in the interior member are fusion-spliced together to form a spliced portion. The spliced portion is disposed in the metal tube.


Patent
SEI Optifrontier Co. and Sumitomo Electric Industries | Date: 2014-06-18

An optical fiber cleaver capable of precisely counting and indicating the number of cuts of an optical fiber is provided. An optical fiber cleaver 1 includes a cleaver base body 3 having a holder guide portion 7 which positions a fiber holder 6 holding an optical fiber 2, and a cleaver lid body 4 attached to the cleaver base body 3 to be openable and closable. A slider having a blade member piercing the optical fiber 2 is attached to the cleaver base body 3 to be movable in a width direction. A pawl member 20 is arranged in one sidewall of the holder guide portion 7. Further, a count indication mechanism 21 which counts and indicates the number of times the slider returns to an initial position is provided in the cleaver base body 3. The optical fiber cleaver 1 is configured to enable a counting operation of the count indication mechanism 21 only when the fiber holder 6 is set in the holder guide portion 7 such that the pawl member 20 is pressed.


Patent
SEI Optifrontier Co. | Date: 2016-01-22

An optical fiber fusion splicer disclosed. The optical fiber fusion splicer includes: a first microscope configured to observe first and second optical fibers from a first direction by receiving light emitted from a first light source; a second microscope configured to observe the first and second optical fibers from a second direction by receiving light emitted from a second light source, the second direction crossing the first direction; a fusion splicing mechanism configured to fusion-splice an end portion of the first optical fiber and an end portion of the second optical fiber; and a control unit configured to control the fusion splicing mechanism. The first microscope is movable in the first direction. The second microscope is secured to not move in the second direction.


Patent
SEI Optifrontier Co. | Date: 2016-03-02

A splicer and a method for fusion-splicing optical fibers are provided, in which the disconnection of a fusion spliced portion of optical fibers can be prevented when the windbreak cover is opened upon fusion splicing. A method for fusion-splicing optical fibers includes: holding optical fibers on optical fiber holders which are arranged on a pair of movable stages, respectively and covering the holders with a windbreak cover; and butting the optical fibers each other by bringing the pair of movable stages mutually closer; fusion-splicing the butted optical fibers together; and loosening, before opening the windbreak cover 4, the tension applied to optical fibers between the fiber holding parts and positions at which the windbreak cover contacts with the optical fibers.


Patent
SEI Optifrontier Co. | Date: 2016-02-25

A method for fusion-splicing optical fibers and a fusion splicer are provided, which enable preventing a fusion spliced portion from disconnecting when the optical fiber is removed from the fusion splicer. A fusion-splicing method for optical fibers comprises: holding optical fibers and on optical fiber holding parts respectively provided on a pair of movable stages; butting ends of optical fibers by bringing the pair of movable stages mutually closer; fusion-splicing butted optical fibers to form a fusion spliced portion S; carrying out a proof test, the proof test including applying a tension to the fusion spliced portion S by moving the pair of movable stages so as to distance them from each other; and bringing the pair of movable stages mutually closer by a predetermined distance upon completion of the proof test.


Patent
SEI Optifrontier Co. | Date: 2016-02-26

The present embodiment relates to an optical amplifier which can perform an amplification operation equivalent to a normal operation even with an increase of dark current in a PD forming a part of a light detection circuit for monitoring signal light as an amplification object. In the optical amplifier, a detection controller performs an anomaly determination on a light detection circuit due to an increase of dark current in the PD based on a difference between temporal change amounts of a signal component of a voltage of output signal from a light receiving unit including the PD, and a voltage component in a high frequency region included in the signal component. An amplification controller can perform suitable switching of control on a drive current to a pumping light source, based on the result of the determination.


Patent
SEI Optifrontier Co. | Date: 2014-06-04

An object of the invention is to provide a fusion splicer capable of fusing optical fibers smoothly and well even in the case of working from any of the front and the back. A fusion splicer (10) includes a pair of holder installation parts (13) for mutually butting optical fibers (12) in a first direction (X), and a fusion splicing part (11) for mutually fusing and splicing the optical fibers (12) by a pair of electrodes (16) opposed along a second direction (Y), and the holder installation part (13) includes a base (51) fixed to a body, and a positioning member (50) in which a base fitting part (65) fitted into the base (51) is formed in a lower side, and the positioning member (50) can be attached to and detached from both of the bases (51) after an attitude is reversed, and a center position in a width direction along the second direction (Y) in the base fitting part (65) is arranged in a straight line of the first direction (X) passing through a center position between the electrodes (16) even in a state in which the positioning member is fitted into any of the bases (51).

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