JP5108738B2 - Optical connector and optical connector assembling method - Google Patents

Description

  The present invention relates to an optical connector to which a coated optical fiber having a coating on the outer periphery of a bare optical fiber is attached, and an optical connector assembling method.

  2. Description of the Related Art An optical connector that can be joined to a built-in optical fiber without using an adhesive by bending and fixing the coated optical fiber is known. For example, an optical connector 100 disclosed in Patent Document 1 shown in FIG. 9 includes a ferrule 101 having a short built-in optical fiber 101a, and a splice that holds the ferrule 101 and the built-in optical fiber 101a protruding from the rear end face of the ferrule 101. The coated optical fiber 102 is introduced into the splice member 104 from the rear, the built-in optical fiber 101a and the coated optical fiber 102 are brought into contact with each other, and the splice member 104 is clamped and fixed to the coated optical fiber 102. . A boot 103 that covers the coated optical fiber 102 led rearward is attached to the rear portion of the optical connector 100. The joining position of the built-in optical fiber 101a and the coated optical fiber 102 is filled with a refractive index matching agent 110 to achieve low loss and low reflection of transmitted light at the joining surface.

The coated optical fiber 102 can be bonded to the built-in optical fiber 101a without using an adhesive by fixing the optical fiber 102 with a surplus length so as to bend inside the boot 103 and fixing it to the rear end portion of the boot 103. By bending the coated optical fiber 102, a pressing force can always be applied from the rear side of the coated optical fiber 102 to the joint surface between the coated optical fiber 102 and the built-in optical fiber 101a. The bonding state can be maintained. Further, when a tension acts on the coated optical fiber 102, the tension acting on the joint surface can be reduced.
JP 2005-345753 A

By the way, in order to connect the coated optical fiber 102 with high accuracy with a simple connection operation, the coated optical fiber 102 is bent by an insertion force to the optical connector for fixing the coated optical fiber with bending. An optical connector 100 </ b> A is proposed in which the coating 106 at the tip of the coated optical fiber 102 is removed by the coating removing unit 105 shown in FIG. 10 and the bare optical fiber 107 is inserted into the optical fiber holding hole 108. The coated optical fiber 102 is deflected inside the boot 103, so that a pressing force is always applied from the rear side of the coated optical fiber 102, and when the connector is not connected, the coated tip is applied to the coated removal portion 105. Maintain a contact state.
However, in this type of optical connector 100A, as shown in FIG. 10A, there is no gap between the coating removal portion 105 and the coating 106 as described above at room temperature. Therefore, as shown in FIG. 10B, when the temperature is high, the coating 106 is in contact with the coating removal portion 105 due to the difference in thermal expansion between the optical connector 100A and the bare optical fiber 107. By drawing from the surface and opening the fiber end surfaces, the characteristics become unstable, and there is a possibility that the optical coupling loss increases.
The present invention has been made in view of the above circumstances, and provides an optical connector and a method for assembling the optical connector in which a bare optical fiber is not drawn into the ferrule at a high temperature, and thereby to stabilize optical coupling characteristics. Objective.

The above object of the present invention is achieved by the following configuration.
(1) An optical connector comprising a ferrule having an optical fiber holding hole, a coated optical fiber, and a fixing means for fixing the coated optical fiber derived from the rear end face of the ferrule in a predetermined bending shape There,
The bare optical fiber from which the coating portion at the tip of the coated optical fiber has been removed protrudes from the tip surface of the optical fiber holding hole, and the end face of the bare fiber does not recede from the tip surface of the optical fiber holding hole in use. An optical connector characterized by being set to a protruding amount.

  According to this optical connector, the bare optical fiber protrudes slightly from the front end surface of the ferrule (with a protrusion amount that does not retract from the front end surface in the usage state). The optical fiber retracts into the ferrule, and a gap is generated between the ferrule coating removal portion 105 and the coating tip. This gap makes it possible to absorb the difference in thermal expansion between the ferrule and the coated optical fiber generated at a high temperature. That is, the ferrule and the coating tip come into contact at an early stage, and the tip of the bare optical fiber is not drawn into (retreated by) the ferrule as the ferrule expands.

(2) The protruding amount L is the length of the small-diameter hole portion of the ferrule that can accommodate the bare optical fiber, with the thermal expansion coefficient of the ferrule as α1 and the thermal expansion coefficient of the coated optical fiber as α2. When L is 1 and the temperature when the optical connector is assembled is T1 and the maximum temperature is T2 when the optical connector is used, L ≧ (α1−α2) × (T2−T1) × l. The optical connector according to (1).

  According to this optical connector, the bare optical fiber is not drawn into the ferrule due to the fact that the difference in thermal expansion at a high temperature when the protrusion amount L is less than the value of the inequality right expression cannot be absorbed.

(3) The optical connector according to (2), wherein the protrusion L at normal temperature during assembly is 200 μm or less.

  According to this optical connector, buckling or bending due to collision between bare optical fibers at the time of optical coupling when the protruding amount L is 200 μm or more does not occur.

(4) The ferrule includes a first hole that can accommodate the coated optical fiber, a second hole that can accommodate the bare optical fiber from which the coated optical fiber is removed, and the first hole. The light of any one of (1) to (3), further comprising: a coating removing portion that is formed between the one hole portion and the second hole portion and removes the coating portion of the coated optical fiber. connector.

  According to this optical connector, it is possible to perform a simple connection operation in which the coating is removed at the coating removal unit, and avoid the drawing of the bare optical fiber into the ferrule due to the expansion of the ferrule at a high temperature.

(5) A ferrule having an optical fiber holding hole, a coated optical fiber, and a fixing means for fixing the coated optical fiber led out from a rear end surface of the ferrule in a predetermined bending shape, the coated An optical connector assembling method for projecting a bare optical fiber from which a coating portion at the tip of an optical fiber is removed from a tip surface of the optical fiber holding hole,
A step of attaching a position restricting member in which a concave portion having a predetermined depth is formed at a position facing the optical fiber holding hole to the tip surface of the ferrule;
Inserting the coated optical fiber into the optical fiber holding hole until the fiber tip abuts against the bottom of the recess of the position regulating member;
Fixing the coated optical fiber derived from the rear end surface of the ferrule to a predetermined bending shape by the fixing means;
Excluding the position regulating member from the ferrule;
An optical connector assembling method comprising:

  According to this optical connector assembling method, when the bare optical fiber protrudes from the front end surface of the ferrule when the coated optical fiber is inserted, the front end of the bare optical fiber enters the concave portion of the position regulating member and contacts the bottom. Any further protrusion is restricted. Thereby, the protrusion amount from the front end surface of the bare optical fiber is restricted to a protrusion amount that does not recede from the front end surface in the use state.

(6) The ferrule includes a first hole that can accommodate the coated optical fiber, a second hole that can accommodate the bare optical fiber from which the coated optical fiber is peeled, and the first hole. A coating removal portion that is formed between the first hole portion and the second hole portion and removes the coating portion of the coated optical fiber, and the depth of the concave portion of the position regulating member is determined by the coating removal portion. The method of assembling an optical connector according to (5), wherein the optical connector is set in consideration of the spring action of the coated portion of the coated optical fiber to be removed.

  According to this optical connector assembling method, the depth of the concave portion is set deep enough to take into account the spring action of the covering portion (mainly spring back due to the removal of the removed covering residue), and the bare light abutting on the bottom portion is set. The protruding amount of the fiber takes into account the springback amount. Thereby, even if the bare optical fiber is retracted by the spring back, the bare optical fiber is not retracted from the front end surface in the use state.

  According to the optical connector of the present invention, in the optical connector in which the bare optical fiber protrudes from the tip surface of the optical fiber holding hole, the bare optical fiber is set to a protruding amount that does not recede from the tip surface in the use state. Even if a difference in thermal expansion between the ferrule and the optical fiber sometimes occurs, the bare optical fiber is not drawn into the ferrule and the characteristics are stabilized.

  According to the method of assembling an optical connector according to the present invention, the position restricting member is attached to the tip surface of the ferrule, and the coated optical fiber is inserted until the fiber tip comes into contact with the bottom of the concave portion of the position restricting member. Since the position restricting member is excluded after the fiber is fixed to the bent shape by the fixing means, the bare optical fiber can be set with high accuracy to an optimum protruding amount that does not retreat from the distal end surface in a simple operation.

Preferred embodiments of an optical connector and an optical connector assembling method according to the present invention will be described below with reference to the drawings.
FIG. 1 is a longitudinal sectional view of a first embodiment of an optical connector according to the present invention.
The optical connector 31 of this embodiment is an optical connector to be attached to the coated optical fiber 19, and is fitted into the main body 33 for inserting and fixing the coated optical fiber 19, The main body 33 includes a ferrule 38 that communicates with a coaxial optical fiber holding hole 37, and a main body 33 and a housing 41 that covers a part of the ferrule 38 protruding from the main body 33.

2 is an exploded perspective view of the main body of the optical connector shown in FIG.
The main body 33 includes a base member 42 to which a ferrule 38 is fitted and attached at the tip, an extra-length accommodating portion lid member 44 that is superimposed on a notch 42a behind the base member 42, and a fixing lid that is a fixing means. A member 45 and a clamp member 46 that clamps and fixes each of the lid members 44 and 45 stacked on the base member 42 integrally with the base member 42 are configured.

The base member 42 has a fiber insertion portion 47 through which the coated optical fiber 19 is inserted, and a ferrule fitting hole 48 (see FIG. 1) into which the proximal end portion of the ferrule 38 is fitted is formed on the distal end side. Has been.
Further, the rear half of the base member 42 has a half-cracked structure in which the upper portion of the fiber insertion portion 47 is opened by the notch 42a.

  As shown in FIG. 1, the surplus length accommodating portion lid member 44 that covers the substantially first half of the notch 42 a has a structure in which the center portion on the inner surface side is removed, and is covered above the fiber insertion portion 47. A surplus length accommodating space 51 for accommodating the surplus length (bent portion) 19a of the attached optical fiber 19 is defined.

  The fixing lid member 45 has a coated optical fiber in a state where the outer peripheral surface of the coated optical fiber 19 placed on the fiber insertion portion 47 having a V-groove structure is pressed and positioned by the inner surface 45a against the V-groove. 19 fixed.

  Each lid member 44, 45 has a width at the time of abutment by fitting positioning protrusions 44b, 45b projecting on the lower surface thereof into a guide groove 42b formed on the abutment surface of the notch 42a. Misalignment in the direction (in FIG. 1, the direction perpendicular to the paper surface) is prevented.

  The clamp member 46 is formed by, for example, press molding of a metal plate for a spring, and the lid members 44 and 45 are clamped by sandwiching the upper surface of the lid members 44 and 45 and the lower surface of the base member 42. The base member 42 is fixed.

FIG. 3 is an enlarged view of the ferrule shown in FIG. 1, and FIG. 4 is an enlarged view showing the configuration of the ferrule coating removal unit shown in FIG.
As shown in FIGS. 1 and 3, the optical fiber holding hole 37 of the ferrule 38 has an inner diameter that is substantially the same (exactly slightly larger) as the outer diameter of the coated optical fiber 19 (the outer diameter d1 in FIG. 4). And the inner diameter of the bare optical fiber 20 from which the coating of the coated optical fiber 19 is removed (the outer diameter d3 in FIG. 4) is substantially the same (exactly slightly larger). A second hole 55 and a sheath receiving portion 57 that is located between the first hole 53 and the second hole 55 and is a space for accommodating the sheath 19b removed at the tip of the sheathed optical fiber 19; I have. As shown in the figure, the coating receiving portion 57 is formed in a space wider than the first hole portion 53.

  Further, as shown in FIGS. 3 and 4, the end of the second hole 55 facing the coating receiving portion 57 is covered with a coating 19b (first coating) of the coated optical fiber 19 inserted from the first hole 53 side. 19b1 and second coating 19b2) are in contact with each other to form a coating removal portion 61 for removing the coating 19b.

  As shown in an enlarged view in FIG. 4, the tip end of the sheath removing portion 61 includes a tapered portion 61 a formed on the inner peripheral surface of the end portion of the second hole portion 55, and a sheath receiving portion continuous with the end portion of the second hole portion 55. The taper portion 61b formed on the wall surface on the 57th side forms an acute angle. In the present embodiment, the tip of the coating removing unit 61 is set in a conical shape.

Further, the shape of the coating removal portion 61 will be described in detail as follows.
The end portion of the second hole 55 having an inner diameter D1 substantially equal to (slightly larger than) the outer diameter of the bare optical fiber 20 is larger than the inner diameter d3 of the first coating 19b1 of the coated optical fiber 19 by the tapered portion 61a. The dimension D2 is set to be smaller than the outer diameter d2 of the first coating 19b1.
On the other hand, the taper portion 61b formed on the wall surface on the side of the coating receiving portion 57 connected to the end portion of the second hole 55 is gradually larger than D2 and gradually from the position of the dimension D3 smaller than the outer diameter d2 of the first coating 19b1. It has an inclined taper surface.
Therefore, the distal end portion of the sheath removing portion 61 has a shape in which a flat surface 61c that receives a collision with the coated optical fiber 19 is left, although it is a slight width sandwiched between D2 and D3.

By adopting the above-described configuration, the flat surface 61c of the coating removing unit 61 is in contact with the coating position of the coated optical fiber 19 inserted through the first hole 53, and the second outer peripheral side of the coating 19b. Since it is in contact with the position of the first coating 19b1 on the inner peripheral side, which is lower in hardness than the coating 19b2, the coating can be removed easily.
Further, since the inner peripheral surface of the end portion of the second hole 55 is set to the tapered portion 61 a, the bare optical fiber 20 from which the coating has been removed can be favorably guided into the second hole 55.

  As shown in FIG. 3, a refractive index matching film 63 is affixed to the distal end surface of the ferrule 38 from which the end surface of the bare optical fiber 20 protrudes in order to prevent a decrease in transmission characteristics when joined to a mating connector or the like. May be.

FIG. 5 is a sectional view of a ferrule in which the protruding amount of the bare optical fiber is set by the position regulating member.
The optical connector 31 is set to a protruding amount L in which the bare optical fiber 20 does not retreat from the distal end surface 38a of the ferrule 38 in which the optical fiber holding hole 37 is opened in the use state.

The protruding amount L is such that the thermal expansion coefficient of the ferrule 38 is α1, the thermal expansion coefficient of the bare optical fiber 20 is α2, and the small-diameter hole portion (second hole portion 55) of the ferrule 38 that can accommodate the bare optical fiber 20 is used. The length when the optical connector is assembled is T1, the temperature when the optical connector is assembled, and the maximum temperature T2 when the optical connector is used.
L ≧ (α1−α2) × (T2−T1) × l Equation 1
Set to

  The optical connector 31 is configured so that the protruding amount L is set to Equation 1 so that the difference in thermal expansion at high temperatures when the protruding amount L is less than the value of the right equation of the inequality 1 cannot be absorbed. There is no retraction inside the ferrule.

  Moreover, it is preferable that the protrusion amount L at normal temperature during assembly has a lower limit value of 20 μm and an upper limit value of 200 μm or less. The lower limit value of 20 μm is a protruding amount considering the thickness of the refractive index matching film 63. Therefore, when the refractive index matching film 63 is not used, the lower limit is increased by the thickness. By setting the upper limit value to 200 μm or less, buckling or bending due to the collision of the bare optical fibers at the time of optical coupling when the protruding amount L is 200 μm or more does not occur. That is, as shown in FIG. 11 (a) as a reference example, when the bare optical fiber 107 protrudes excessively, the optical fiber is coupled as shown in FIG. 11 (b) when optically coupled regardless of the difference in thermal expansion. Although 107 may buckle and break, there is no such inconvenience if the protrusion L is set to 200 μm or less.

  For setting the protrusion amount L, a position regulating member 71 in which a concave portion 70 having a predetermined depth is formed at a position facing the optical fiber holding hole 37 is used. The position regulating member 71 is attached to the distal end surface 38a of the ferrule 38 by attachment means (not shown). As a mounting means, a slide mounting structure from the direction orthogonal to the axis of the bare optical fiber 20 can be applied in addition to a threaded structure using an elastic locking claw and a male and female screw. The bare optical fiber 20 has its tip abutting against the concave portion 70 of the position regulating member 71 attached to the tip surface 38a, so that the protruding amount L from the tip surface 38a is set. That is, the predetermined depth of the recess 70 is the protrusion amount L.

FIG. 6 is a cross-sectional view of a ferrule in which the protrusion amount is set by the position restricting member in which the spring back amount is considered.
The depth of the concave portion 70 of the position restricting member 71 is set in consideration of the spring action of the coating 19b of the coated optical fiber 19 removed by the coating removing unit 61 (mainly spring back by the removed coating residue). May be. That is, in the position restricting member 71A shown in FIG. 6, the recess 70A has a depth obtained by adding the springback amount S to the protrusion amount L (L + S). According to this position restricting member 71A, the amount of protrusion of the bare optical fiber 20 in contact with the bottom of the recess 70A takes into account the springback amount S. Thereby, even if the bare optical fiber 20 is retracted by the spring back, the bare optical fiber 20 is not retracted from the distal end surface 38a in the use state.

Next, a method for assembling the optical connector 31 and the coated optical fiber 19 described above will be described.
FIG. 7 is an explanatory view of a method of assembling the optical connector and the coated optical fiber shown in FIG.
This assembling method includes a ferrule 38 in which an optical fiber holding hole 37 is formed, and a fixing lid member 45 for fixing the coated optical fiber 19 led out from the rear end face of the ferrule 38 to a predetermined bending shape, and is provided with a coating. The bare optical fiber 20 from which the coating portion at the tip of the optical fiber 19 is removed is projected from the tip surface 38 a of the optical fiber holding hole 37.

  First, as shown in FIG. 7A, a position restricting member 71 in which a concave portion 70 having a predetermined depth is formed at a position facing the optical fiber holding hole 37 is attached to the distal end surface 38a (see FIG. 5) of the ferrule 38. . The coated optical fiber 19 is inserted into the first hole 53 of the optical fiber holding hole 37 of the ferrule 38 fitted and attached to the tip of the base member 42.

  As shown in FIG. 7B, the tip of the coated optical fiber 19 is brought into contact with the coating removal portion 61 at the rear end of the second hole 55 to remove the coating 19b on the tip side and to cover the removed coating 19b. It is accommodated in the receiving part 57. The bare optical fiber 20 exposed after the coating 19 b is removed enters the second hole 55.

  The coated optical fiber 19 is inserted until the end of the bare optical fiber 20 abuts against the bottom of the recess 70 of the position regulating member 71. When the bare optical fiber 20 protrudes from the distal end surface 38a of the ferrule 38 by insertion of the coated optical fiber 19, the distal end of the bare optical fiber 20 enters the recess 70, and further protrusion is restricted by contacting the bottom. The Thereby, the protrusion amount L from the front end surface 38a of the bare optical fiber 20 is regulated to a protrusion amount L that does not retreat from the front end surface 38a of the ferrule 38 in the use state.

  When the protruding bare optical fiber 20 is completely inserted into the second hole 55, the cover members 44 and 45 are placed on the notches 42a of the base member 42 as shown in FIG. 7C. Further, as shown in FIG. 7 (d), the lid members 44 and 45 are fixed to the base member 42 by the clamp member 46, and the coated optical fiber 19 is fixed to a predetermined bending shape, and then the housing 41 is provided on the outer periphery thereof. And the position restricting member 71 is removed (detached) from the ferrule 38, and the mounting operation of the optical connector 31 to the coated optical fiber 19 is completed.

  In the above assembling method, the position restricting member 71 not including the amount of spring back is used. However, if the position restricting member 71A is used, the protruding amount of the bare optical fiber 20 includes the amount of spring back. (S + L). As a result, even if the bare optical fiber 20 is retracted by the spring back, the bare optical fiber 20 is not retracted from the distal end surface 38a in the use state.

FIG. 8 is a cross-sectional view of the ferrule set at an appropriate protrusion amount when the room temperature is normal (a) and when the temperature is high (b).
In the optical connector 31 assembled in this way, the bare optical fiber 20 protrudes slightly (with a protruding amount that does not retract from the distal end surface 38a in use) from the distal end surface 38a of the ferrule 38. FIG. When the optical connectors 31, 31 are connected to each other, the bare optical fiber 20 corresponding to the protruding amount L is retracted into the ferrule 38, and a gap T is generated between the coating removal portion 61 of the ferrule 38 and the coating tip. This gap T makes it possible to absorb the difference in thermal expansion between the ferrule 38 and the coated optical fiber 19 that occurs at a high temperature shown in FIG. Therefore, even if the ferrule 38 expands and the gap T decreases to become the gap t (T> t), the coating removal portion 61 does not come into contact with the coating tip and is not strongly pressed. As a result, the ferrule 38 and the coated tip contact each other at an early stage, and the bare optical fiber 20 is not drawn into the ferrule (retreats from the tip surface 38a) as the ferrule 38 expands.

  According to the optical connector 31 configured as described above, in the optical connector 31 in which the bare optical fiber 20 from which the coating portion at the tip of the coated optical fiber 19 has been removed is projected from the tip surface 38a of the optical fiber holding hole 37, the bare optical fiber 20 However, since the protruding amount L is set so as not to retreat from the distal end surface 38a of the ferrule 38 in the use state, the bare optical fiber 20 is drawn into the ferrule even if a thermal expansion difference occurs between the ferrule 38 and the optical fiber 19 at a high temperature. The characteristic is stabilized.

  In particular, in the optical connector 31 in which the coating removal portion 61 is formed on the ferrule 38 and the bare optical fiber 20 is not fixed, a simple connection operation in which the coating 19b is removed by the coating removal portion 61 is possible. However, it is possible to avoid the bare optical fiber 20 from being drawn into the ferrule due to the expansion of the ferrule 38 at a high temperature.

  Further, according to the method for assembling the optical connector 31, the position regulating member 71 is attached to the distal end surface 38 a of the ferrule 38, and the coated optical fiber 19 is inserted until the fiber distal end abuts against the bottom of the concave portion 70 of the position regulating member 71. Then, after fixing the coated optical fiber 19 in a bent shape by the fixing lid member 45 and the clamp member 46, the position restricting member 71 is excluded. The optimum protrusion amount L that does not retreat from 38a can be set with high accuracy.

It is a longitudinal cross-sectional view of 1st Embodiment of the optical connector which concerns on this invention. It is a disassembled perspective view of the main-body part of the optical connector shown in FIG. It is an enlarged view of the ferrule shown in FIG. It is an enlarged view which shows the structure of the coating removal part of the ferrule shown in FIG. It is sectional drawing of the ferrule by which the protrusion amount of a bare optical fiber is set with a position control member. It is sectional drawing of the ferrule by which protrusion amount is set with the position control member in which the springback amount was considered. It is explanatory drawing of the assembly method of the optical connector and coated optical fiber which were shown in FIG. It is sectional drawing which represented the time of normal temperature of the ferrule set to a suitable protrusion amount at (a), and the time of high temperature by (b). It is sectional drawing of the conventional optical connector. It is principal part sectional drawing which represented the time of normal temperature in the conventional optical connector with insufficient protrusion amount at (a), and high temperature (b). It is a reference view of a cross-section of the main part, in which (a) shows a connection with an optical connector with an excessive protrusion and (b) shows a broken bare optical fiber.

Explanation of symbols

DESCRIPTION OF SYMBOLS 19 Optical fiber with coating 19b Coating 20 Bare optical fiber 31 Optical connector 37 Optical fiber holding hole 38 Ferrule 38a Tip surface 45 Fixing lid member (fixing means)
53 1st hole 55 2nd hole 61 Cover removal part 70 Recess 71 Position restriction member L Projection amount T1 Temperature when assembling optical connector T2 Maximum temperature when using optical connector l Length of narrow hole of ferrule α1 Ferrule Coefficient of Thermal Expansion of α2 Coated Optical Fiber

Claims (3)

An optical connector comprising a ferrule having an optical fiber holding hole, a coated optical fiber, and a fixing means for fixing the coated optical fiber derived from the rear end surface of the ferrule in a predetermined bending shape,
The bare optical fiber which the covering portion is removed the tip of the coated optical fiber protrudes from the distal end surface of the optical fiber holding hole,
The protruding amount L of the bare optical fiber is such that the thermal expansion coefficient of the ferrule is α1 so that the end face of the bare optical fiber does not always recede from the tip face of the optical fiber holding hole in the operating temperature range of the optical connector. The coefficient of thermal expansion of the bare optical fiber is α2, the length of the small-diameter hole of the ferrule that can accommodate the bare optical fiber is l, the temperature when the optical connector is assembled is T1, and the optical connector is used. An optical connector characterized in that L ≧ (α1−α2) × (T2−T1) × 1 when the maximum temperature T2 is satisfied . The projecting amount of the room temperature at the time of assembly L is the optical connector according to claim 1, wherein a is 200μm or less.   A first hole that allows the ferrule to receive the coated optical fiber; a second hole that allows the bare optical fiber from which the coated optical fiber is removed; and the first hole 3. The optical connector according to claim 1, further comprising: a coating removal portion that is formed between the first hole portion and the second hole portion and removes the coating portion of the coated optical fiber.

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