JP2004117794A - Method and device for processing end of plastic optical fiber - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for processing the end of a plastic optical fiber (optical fiber) and a device therefor which can efficiently perform a polishing process in particular of an optical fiber and which can efficiently perform the end processing easily in a short period of time. <P>SOLUTION: In this end processing method of an optical fiber, two or more optical fibers are fixedly projected at right angles in a desired length from the fiber projecting plane of a fixing jig. While the side of the projected optical fiber is held with a fiber holder having a blade-receiving face orthogonal to the fiber projecting plane of the fixing jig, the optical fiber is cut off with a thin blade which is parallel to the fiber projecting plane. This end face processing device is composed of a fixing jig for the end face processing, the cutter and the fiber holder. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for treating an end face of a plastic optical fiber and an apparatus therefor.
[0002]
[Prior art]
For connecting optical fibers, a smooth end face perpendicular to the fiber axis is required. In order to obtain such an end face, the conventional quartz fiber has a thin fiber diameter of about 125 μm and is easy to break. Therefore, after attaching the quartz fiber to the ferrule and fixing it, the unnecessary tip is accurately positioned. Then, it is carefully polished using three or more types of polishing sheets from coarse to fine so as not to crack the quartz fiber.
[0003]
On the other hand, in the case of a plastic optical fiber, since its diameter is about 500 μm, which is larger and more flexible than a quartz fiber, complicated end face treatment like a quartz fiber is not required. Without being fixed to the ferrule, it can be cut freely such as nippers and scissors, and polishing is also easy. Usually, a plurality of optical fibers are fixed to a polishing jig and cut with nippers, scissors or the like, or a plurality of cut optical fibers are fixed to a polishing jig and the end face is polished. Several methods have been proposed as this cutting method (see, for example, Patent Documents 1 to 3).
However, the end face of the plastic optical fiber cut by nippers, scissors, etc. is cracked and has a disordered shape. All of these are removed by polishing, and a long polishing time is required to make the surface perpendicular to the fiber axis and smooth. Needed. Further, in simultaneous polishing of a plurality of optical fibers, if the protruding lengths from the jig are not uniform, unnecessary polishing is performed until the end face of the fiber with the shortest protruding amount can be polished. For this reason, it cannot be said that the work efficiency of the end face processing including the polishing step is necessarily good.
[0004]
In addition, the transmission distance of plastic optical fiber, which is about 50 m in the conventional general acrylic fiber, is transparent fluorine having excellent near-infrared light transmission characteristics disclosed in JP-A-8-5848 (Patent Document 4) and the like. According to the resin fiber, transmission is possible up to about 200 m. With a plastic optical fiber having such a transmission distance, floor wiring for a plurality of floors can be covered with a single optical cable. In this case, end face processing for classifying (branching) to each floor and connecting to a terminal on each floor is also required.
For this reason, with the increase in the transmission distance of plastic optical fiber, the end face processing frequency is expected to increase more and more, and there is a need for a method capable of performing end face processing of plastic optical fiber simply and efficiently in a short time, and an apparatus therefor. The nature is increasing.
[0005]
[Patent Document 1]
Japanese Patent Laid-Open No. 10-307213 [Patent Document 2]
Japanese Patent Laid-Open No. 2002-71967 [Patent Document 3]
JP 2002-258061 A [Patent Document 4]
JP-A-8-5848 [0006]
[Problems to be solved by the invention]
The present invention has been made in view of the circumstances as described above, and is a plastic optical fiber that can efficiently perform a polishing process particularly for a plastic optical fiber, and can perform end face processing easily and efficiently in a short time. An object is to provide an end face processing method and an apparatus therefor.
[0007]
[Means for Solving the Problems]
The plastic optical fiber end face processing method according to the present invention includes:
Fix two or more plastic optical fibers by projecting them at a right angle and a desired length from the fiber projection plane of the fixture,
The plastic optical fiber is cut with a thin blade parallel to the fiber protruding plane while pressing the side surface of the protruding plastic optical fiber with a fiber holder having a blade receiving surface perpendicular to the fiber protruding plane of the fixing jig.
[0008]
The plastic optical fiber fixed to the fixing jig can be subjected to a polishing process as it is after being cut.
[0009]
In this invention, it is preferable to perform the end surface processing method of the above plastic optical fibers using the following end surface processing apparatus. That is, the plastic optical fiber end face processing apparatus of the present invention is:
A fixing jig for fixing two or more plastic optical fibers, a cutter for cutting the plastic optical fibers, and a fiber presser for cutting the plastic optical fibers perpendicularly to the longitudinal direction thereof,
The fixing jig includes a first base having a fiber holding plane for holding the plastic optical fiber, and a second base having a groove for holding the plastic optical fiber together with the fiber holding plane, The first base and the second base have the same surface, and each has a fiber protruding plane perpendicular to the longitudinal direction of the groove,
The cutter includes a guide plane that guides a fiber protruding plane of the fixing jig, a cutter base having an opening formed by cutting out at least a part of the guide plane, and the cutter is fixed to the cutter base. A thin blade disposed so as to project a blade edge parallel to the guide plane into the opening,
The fiber retainer has a plane that comes into contact with the fiber protruding plane of the fixing jig and a blade receiving surface that is flush with the fiber holding plane of the first base of the fixing jig.
[0010]
In the end face processing apparatus, the cutter has a spacer that constitutes at least a part of the guide plane, and the thin blade is fixed by the spacer and the cutter base.
When the average diameter of the plastic optical fiber is D, the height of the spacer is preferably 0.1D to 3D.
[0011]
According to the plastic optical fiber end face processing method and the end face processing apparatus of the present invention as described above, a plurality of plastic optical fibers fixed to a fixing jig can be cut at the same end and at a perpendicular cutting surface. Polishing efficiency can be improved by subjecting the plastic optical fiber fixed and cut to the fixing jig to the polishing step as it is, and the end face treatment of the plastic optical fiber can be performed easily and in a short time.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
The plastic optical fiber end face processing method according to the present invention fixes two or more plastic optical fibers by projecting them at a right angle from the one end face of the fixing jig and by a desired length, and perpendicularly fixing the one end face of the fixing jig. The plastic optical fiber is cut with a thin blade parallel to the one end face while pressing one side of the protruding plastic optical fiber with a fiber holder having a simple blade receiving surface. The plastic optical fiber fiber cut as described above is directly subjected to a polishing process and polished at the same time.
[0013]
In the present invention, a plastic optical fiber (hereinafter abbreviated as a fiber) is an optical fiber made of a plastic material, and the plastic material is not particularly limited. Specific examples include acrylic resin, polycarbonate, and transparent fluorine-containing resin. The end face processing method according to the present invention is particularly suitable for end face processing of an optical fiber made of a transparent fluorine-containing resin, which enables long-distance transmission and tends to increase the number of connection points.
[0014]
Hereinafter, the present invention will be specifically described with reference to the drawings showing preferred embodiments of the end face processing apparatus of the present invention. In each figure, the same code | symbol shows the same or an equivalent part. In the following, description will be given by taking as an example the case where the end faces of four fibers are processed simultaneously.
FIG. 1 is a side sectional view of a preferred embodiment of the end face processing apparatus according to the present invention in use, and FIG. 2 shows an end face processing apparatus 1 for explaining the configuration of the end face processing apparatus 1 shown in FIG. It is a schematic perspective view of the component before an assembly.
The end surface processing apparatus 1 includes a fixing jig 2 that fixes four fibers 5, 6, 7, and 8, a cutter 3 that cuts the fibers 5 to 8, and the fibers 5 to 8 that are perpendicular to the longitudinal direction thereof. And a fiber presser 4 for cutting.
3 to 5 show the fixing jig 2, the fiber retainer 4, and the cutter 3 separately.
[0015]
FIG. 3A is a front view of the fixing jig 2. The fixing jig 2 includes a first base 20 having a fiber holding plane 201 for holding the fibers 5 to 8 and a second base 21 having grooves 211 and 212 for holding the fiber together with the fiber holding plane 201. Become.
The first base 20 and the second base 21 are integrated by screws 22 and 23 and springs 24 and 25. At this time, the first base body 20 and the second base body 21 have the same surface, and each has a fiber protruding plane 2a orthogonal to the longitudinal direction of the groove.
By sandwiching the four fibers 5 to 8 between the fiber holding plane 201 of the first base 20 and the grooves 211 and 212 of the second base 21, the fiber protruding plane 2a of the integrated fixing jig 2 can be removed. The ends of each fiber are fixed at right angles and projecting a desired length.
[0016]
A partially enlarged sectional view in the vicinity of the grooves 211 and 212 is shown in FIG. The grooves 211 and 212 preferably have a V-shaped cross section. As shown in FIG. 3 (B), even if the diameters of the fibers 5 and 6 are different, the second base 21 has the grooves 211 and 212, so that the fibers can be pressed in a triangular shape. Four fibers can be fixed with the fibers 7 and 8 in the other groove aligned in the groove. Under the present circumstances, the force which clamps the fibers 5-8 can be adjusted by urging | biasing and integrating the said 1st base | substrate 20 and the 2nd base | substrate 21 with a spring. In addition, the number of fibers held per groove can be securely held by one or two or more, but it is desirable that the number of fibers be two or more.
[0017]
The opening angle of the grooves 211 and 212 can be set as appropriate, but is preferably about 50 to 110 ° and more preferably about 70 to 100 ° in order to stably hold the plurality of fibers 5 and 6 having different diameters. The grooves 211 and 212 may be enlarged in diameter by fiber insertion portions 211a and 212a opened on the side other than the fiber protruding flat surface 2a. For example, in order to facilitate insertion of the fiber, a taper or the like can be attached.
[0018]
The width of each groove is preferably about nD to about 1.5 nD, where n is the number of fibers placed in the groove and D is the average fiber diameter. Specifically, the preferable groove width of the groove 211 when the average diameter of the two fibers 5 and 6 shown in the figure is 0.5 mm is about 1 to 1.5 mm.
Further, the number of grooves of the fixing jig 2 is not particularly limited and is not limited to the embodiment shown in FIGS. 1 to 3, but is usually 1 to 4.
[0019]
The material of the fixing jig 2 only needs to have a hardness capable of holding the fiber, but a transparent material capable of visually checking the held fiber from the outside is preferable. Further, it is desirable that it is easy to handle and process, and when the fixing jig 2 is used as a polishing jig after the cutting step, it is less likely to cause unnecessary scratches on the end surface due to the shaving. Specifically, transparent resins such as acrylic resin and polycarbonate are preferably used.
[0020]
4A is a perspective view similar to the cutter 3 shown in FIG. 2, and FIG. 4B is a plan view thereof. The cutting device 3 in FIG. 1 is a side sectional view along II in FIG. 4 (B).
The cutter 3 includes a guide plane 3a for guiding the fiber protruding plane 2a of the fixing jig 2, a cutter base 30 having an opening 31 formed by cutting out at least a part of the guide plane 3a, and the cutter base 30. And a thin blade 32 arranged so as to protrude from the opening 31 with a blade edge 321 parallel to the guide plane 3a.
The cutting device 3 shown in FIG. 4 is a mode in which the thin blade 32 is a double-blade razor and has two openings 31 in which both blade edges 321 are disposed.
[0021]
The cutter 3 according to a preferred embodiment of the present invention has a spacer 33 whose upper surface 33a constitutes at least a part of the guide plane 3a. The protrusion 322 without the cutting edge 321 of the thin blade 32 is inserted into the gap 301 of the cutter base 30, and the thin blade 32 is held by the cutter base 30 and the spacer 33.
By selecting the thickness of the spacer 33, the protruding amount of the cut fibers 5 to 8 from the fiber protruding plane 2a can be controlled. Therefore, the polishing process can be efficiently performed by controlling the protrusion amount to a length suitable for the polishing operation.
[0022]
The protrusion amount is difficult to polish if the fiber protrusion amount from the fixing jig 2 is too long, and it is easy to buckle, so that it is difficult to finish the end face at a right angle. On the other hand, a certain length is required to polish the end face sufficiently. .
According to the study by the present inventors, when the average diameter of the fiber is D, the protrusion amount for polishing needs to be at least 0.1D. That is, in the present invention, the height of the spacer 33, that is, the distance from the guide plane 3a to the thin blade 32 (blade edge 321) is usually 0.1D to 3D, preferably 0.1D to 1D, particularly preferably 0.1D to 0. .5D.
[0023]
Although one embodiment of the cutter 3 has been described above, the guide plane is essentially the same plane in which the cutting means is a thin blade and the cutter base 30 can guide the fiber protruding plane 2a of the fixture 2. The shape of the cutter 3 is not particularly limited as long as it has the opening 3 that can move horizontally toward the cutting edge 321, and the fiber retainer 4 that moves in parallel with the fixing jig 2. It is not limited to the embodiment.
[0024]
FIG. 5 is a perspective view similar to the fiber retainer 4 shown in FIG.
The fiber retainer 4 has a flat surface 4 a that contacts the fiber protruding flat surface 2 a of the fixing jig 2, and a blade receiving surface 4 b that is flush with the fiber holding flat surface 201 of the first base 20 of the fixing jig 2.
2 and 4, the U-shaped opening 41 is provided on the upper surface side, and the opening 42 that straddles the side wall 34 of the cutter 3 is provided on the lower surface side, and the U-shaped opening 41 and the opening 42 are provided. And shows a mode in which they communicate with each other at the central portion. In this aspect, the plane 4a corresponds to the bottom surface of the U-shaped opening 41, and the blade receiving surface 4b extends downward from the open end of the plane 4a.
[0025]
As shown in FIG. 1, in use, the first base 20 of the fixing jig 2 is held in the U-shaped opening 41 of the fiber presser 4, and the fiber protrusion plane 2 a of the first base 20 and the fiber presser 4 The flat surface 4a comes into contact. At this time, the blade receiving surface 4 b is flush with the fiber holding plane 201 of the first base 20.
The blade receiving surface 4 b that is coplanar with the fiber holding plane 201 of the fixing jig 2 is disposed in the opening 31 of the cutter 3. The blade receiving surface 4b has a length that can receive the blade edge 321 when the fibers 5 to 8 are cut.
The blade receiving surface 4b of the fiber retainer 4 only needs to be able to move along with the fixing jig 2. When the fiber retainer 4 is set in the cutter 3, the protruding end surface 4c of the fiber retainer 4 in the opening 31 of the cutter 3 and the opening are opened. There may be a gap between the bottom surface 31a and the bottom surface 31a.
[0026]
You may have the surface which contact | abuts the guide plane 3a of the cutting device 3 in the cutting device 3 side of the fiber holding | suppressing 4.
2 and 4 show the fiber presser 4 in a form in which the first base 20 of the fixing jig 2 is held by the U-shaped opening 41, but the blade receiving surface 4b that receives the blade edge 321 is fixed. The shape is not limited as long as the jig 2 can move in parallel.
[0027]
In order to cut the four fibers 5 to 8 fixed to the fixing jig 2 using the end face processing apparatus 1 including the fixing jig 2, the cutter 3 and the fiber presser 4 as described above, the fixing jig 2 The fiber protruding plane 2a of the second base 21 is slid on the guide plane 3a (spacer upper surface 33a) of the cutter 3 from the opening 31 toward the thin blade 32 until the cutting edge 321 hits the blade receiving surface 4b.
At the time of cutting, since the side surfaces of the fibers 5 to 8 are supported by the blade receiving surface 4b, the fibers are not bent and can be cut at a right angle.
[0028]
Moreover, if it cut | disconnects once, a little deformation | transformation will occur in the blade edge | tip 321, and if it cut | disconnects repeatedly in the same location, sharpness may become dull and a favorable cut surface may not be obtained. The width of the blade edge 321 is preferably wider than the diameter of the optical fibers 5-8. If it is a double blade, you may make it use a single blade. When the width of the fiber is even smaller, the cutting device 3 may be marked at several places and cut at several places on the cutting edge 321. Thereby, one thin blade can be used for multiple times of fiber cutting.
[0029]
The adjustment of the protruding amount after cutting may be performed simultaneously with cutting using the spacer 33 as described above, or may be performed after cutting. For example, when it is not necessary to polish after cutting, the spacer 33 is not provided, and the thin blade 32 surface is used as the uppermost guide plane 3a of the cutter 3, and the fibers 5 to 8 are cut along the fiber protruding plane 2a. You can also. Conversely, it can be cut longer.
[0030]
If it is necessary to adjust the protruding amount after cutting, the protruding amount from the fixing jig 2 is adjusted using a protruding amount adjusting plate 10 having a flat bottom concave portion 11 as shown in FIGS. be able to.
6 is a plan view of the protrusion amount adjusting plate 10, and FIG. 7 is a side sectional view for explaining adjustment of the protrusion amount. In this case, if it is for grinding | polishing, it is desirable for the height of the recessed part 11 to be equivalent to the height of the said spacer 33. FIG.
[0031]
In the present invention, it is preferable to adjust the protrusion amount simultaneously with the cutting because the working time can be shortened. As described above, a very flat polished surface can be easily obtained from the end face cut with the thin blade 32 using the fiber holder 4 in combination with the fixing jig 2 to which the fiber is fixed.
In particular, in the present invention, the fiber fixed to the fixing jig 2 can be used for the polishing process as it is after cutting, and the entire end face processing process including cutting and polishing of the plastic optical fiber can be simplified and efficiently performed. .
[0032]
In the present invention, the polishing process for the cut surfaces of the fibers 5 to 8 can use the same abrasive as that used for conventional plastic optical fiber polishing. Usually, abrasive paper (sheet) is used, which may be carried out either in a wet state with water or in a dry state.
Polishing of the cut surface with nippers and scissors is performed in two stages, first, polishing with abrasive paper having a nominal particle size of 9 μm, and then final polishing with abrasive paper having a nominal particle size of 1 μm in order to remove cracks, disturbances, and the like. The cut surface obtained as described above according to the present invention can be directly polished using polishing paper having a nominal particle diameter of 1 μm, and the polishing process can be efficiently performed in a short time.
[0033]
According to the present invention, a smooth and optical plane can be obtained. Specifically, when the polished end faces are connected by a mechanical splice, the connection can be made with a connection loss of 0.1 dB or less. When a smooth surface is not necessary, the polishing step may be omitted.
[0034]
【Example】
EXAMPLES Next, although an Example demonstrates this invention concretely, this invention is not limited to these Examples.
(Example 1)
An end face treatment of a fluorine-containing resin optical fiber (plastic optical fiber) having a diameter of 0.5 mm was performed.
A cutter base 30 of the cutter 3 having the shape shown in FIG. 4 was prepared using an acrylic resin. The protruding portion 322 of the double-blade razor 32 was placed in the gap 301 of the cutter base 30, and a spacer 33 having a height of 0.2 mm was placed on the double-blade razor 32 and fixed so as not to be displaced from front to back and from side to side. Further, the guide plane 3 a of the cutter base 30 including the upper surface 33 a of the spacer 33 was configured.
[0035]
A block made of an acrylic resin (second base 21) was processed, and V grooves 211 and 212 were dug at a depth of 0.6 mm and a V angle of 90 ° to produce a fixing jig 2 having the shape shown in FIG. The fiber insertion portions 211a and 212a of the V-grooves 211 and 212 are tapered to facilitate fiber insertion.
The two fibers 5 and 6 (7, 8) were inserted from the fiber insertion portions 211a and 212a of the V-groove 211 (212) and held by the first base 20 with two fingers. The tips of the optical fibers 5 to 8 were held by protruding from the fiber protruding plane 2a of the fixing jig 2 by about 4 mm. The fixing jig 2 was used after the base bodies 20 and 21 were previously brought into contact with the screws 22 and 23 and the springs 24 and 25 and the holding force of the fiber was adjusted with the screws 22 and 23.
[0036]
5 is attached to the fixing jig 2, and the fiber protrusion plane 2a of the first base 20 of the fixing jig 2 is placed on the guide plane 3a, so that the end surface processing apparatus 1 shown in FIG. To construct.
The blade receiving surface 4a of the fiber retainer 4 was placed in the opening 31 of the cutter 3, and slid on the guide plane 3a toward the blade edge 321 of the razor 32, and the protruding fibers 5 to 8 were cut. At this time, the fibers 5 to 8 were not bent by the blade edge 321 and could be cut at a right angle by the blade receiving surface 4b of the fiber retainer 4 arranged on the side surfaces of the fibers 5 to 8.
[0037]
After cutting, the fiber retainer 4 was removed from the fixing jig 2, and the fibers 5 to 8 fixed to the fixing jig 2 were directly subjected to a polishing process, and the cut end surface was polished using a polishing sheet having a particle diameter of 1 micron. All four optical fibers could be polished smoothly.
When the obtained polished surfaces were connected by a mechanical splice, the connection loss was 0.1 dB or less.
[0038]
【The invention's effect】
According to the present invention, a plurality of plastic optical fibers can be cut vertically by aligning the positions of the cut surfaces. Further, since the fixing jig at the time of cutting is used as it is as a polishing jig, the end face treatment of the plastic optical fiber can be completed in a short time.
In particular, when a plurality of plastic optical fibers are fixed to a fixing jig and cut, it is difficult to align the ends of the fibers after cutting because the fibers do not slip easily. According to the method, it can be easily aligned and cut.
Further, the cutting device according to the present invention includes a thin blade (razor blade), but the blade tip is not exposed and is safe, and the thin blade can obtain a cut surface free from cracks and disturbances. It can be omitted.
[Brief description of the drawings]
FIG. 1 is a side sectional view showing an example of an embodiment of an end face processing apparatus of the present invention.
FIG. 2 is a perspective view for explaining the configuration of the end surface processing apparatus of the present invention.
3A is a front view of a fixing jig according to the present invention, and FIG. 3B is a partially enlarged sectional view thereof.
FIG. 4A is a perspective view showing a cutter according to the present invention, and FIG. 4B is a plan view thereof.
FIG. 5 is a perspective view of a fiber presser according to the present invention.
FIG. 6 is a plan view of a protrusion amount adjusting plate according to the present invention.
FIG. 7 is a side cross-sectional view for explaining the operation of an embodiment in which the protrusion amount is adjusted after cutting in the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... End surface processing apparatus 2 ... Fixing jig 2a ... Fiber protrusion plane 20 ... 1st base | substrate 201 ... Fiber holding | maintenance plane 21 ... 2nd base | substrate 211,212 ... Groove 211a, 212a ... Fiber insertion part 22,23 ... Screw 24,25 ... Spring 3 ... Cutter 3a ... Guide plane 30 ... Cutter base 301 ... Cavity 31 ... Opening 31a ... Opening bottom 32 ... Thin blade 321 ... Cutting edge 322 ... Protrusion 33a ... Spacer upper surface 34 ... Side wall 4 ... Fiber presser 41 ... U-shaped opening 42 ... opening 4a ... plane 4b ... blade receiving surface 5, 6, 7, 8 ... plastic optical fiber 10 ... projection amount adjusting plate 11 ... concave

Claims (6)

A fixing jig for fixing two or more plastic optical fibers, a cutter for cutting the plastic optical fibers, and a fiber presser for cutting the plastic optical fibers perpendicularly to the longitudinal direction thereof,
The fixing jig includes a first base having a fiber holding plane for holding the plastic optical fiber, and a second base having a groove for holding the plastic optical fiber together with the fiber holding plane, The first base and the second base have the same surface, and each has a fiber protruding plane perpendicular to the longitudinal direction of the groove,
The cutter includes a guide plane that guides a fiber protruding plane of the fixing jig, a cutter base having an opening formed by cutting out at least a part of the guide plane, and the cutter is fixed to the cutter base. A thin blade disposed so as to project a blade edge parallel to the guide plane into the opening,
The fiber presser has a flat surface that comes into contact with a fiber projecting flat surface of the fixing jig, and a blade receiving surface that is coplanar with the fiber holding plane of the first base of the fixing jig. End face processing equipment. 2. The end face treatment of a plastic optical fiber according to claim 1, wherein the cutter has a spacer constituting at least a part of the guide plane, and the thin blade is fixed by the spacer and the cutter base. apparatus. The plastic optical fiber end face processing apparatus according to claim 2, wherein a height of the spacer is 0.1D to 3D, where D is an average diameter of the plastic optical fiber. Fix two or more plastic optical fibers by projecting them at a right angle and a desired length from the fiber projection plane of the fixture,
While holding the side surface of the protruding plastic optical fiber with a fiber holder having a blade receiving surface perpendicular to the fiber protruding plane of the fixing jig, the plastic optical fiber is cut with a thin blade parallel to the fiber protruding plane.
End face processing method of plastic optical fiber. The method for treating an end face of a plastic optical fiber according to claim 4, wherein the end face treating apparatus according to claim 1, 2, or 3 is used. The plastic optical fiber end face processing method according to claim 4 or 5, wherein the plastic optical fiber fixed to the fixing jig is subjected to polishing as it is after being cut.

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