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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).


Patent
Sei Optifrontier Co. | Date: 2014-11-26

An optical-fiber fusion-splicing device includes: a first heating device in which a fusion-splicing operation of heating and fusing abutting parts of at least a pair of optical fibers with end faces brought into contact with each other is performed; a second heating device in which a reinforcing operation of heating and shrinking a heat-shrinkable resin which covers a site where the optical fibers are fusion-spliced to each other is performed; and a CPU which controls the first heating device and the second heating device, wherein the CPU preheats a heater of the second heating device so as to reach a predetermined first temperature, if the CPU receives a heating end signal from the first heating device, and thereafter, heats the heater of the second heating device so as to reach a second temperature higher than the first temperature, if the CPU receives a reinforcement start signal.


Patent
Sei Optifrontier Co. | Date: 2014-11-26

This reinforcement device includes: a first heater (9A) on which a fusion-spliced section of an optical fiber covered with a protective member is disposed and which heats a central portion of the protective member at a first temperature (T1); second heaters (9B) which are respectively provided on both sides of the first heater (9A) along a longitudinal direction of the optical fiber and respectively heat both end portions of the protective member at a second temperature (T2); and a CPU (14) which performs energization control for heating each of the first heater (9A) and the second heaters (9B), wherein the CPU (14) makes an energizing time of the first heater (9A) and an energizing time of each of the second heaters (9B) at least partially overlap.

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