JP2012159709A - Optical connector and method of assembling the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical connector capable of achieving preferable PC connection through a simple structure and a method of assembling the same.SOLUTION: An optical connector includes a ferrule for holding one end side of an optical fiber and an optical fiber holding part for holding and fixing the optical fiber extending from the ferrule. The optical fiber is fixed by the optical fiber holding part under a state of projecting from the tip of the ferrule for a predetermined projection amount ΔL. When a connection destination and the optical fiber are connected, the optical fiber is depressed up to the end face of the ferrule, resulting in elastic deformation with no bending from the tip of the optical fiber to the fixed end of the optical fiber holding part.

Description

  The present invention relates to an optical connector for an optical fiber and a method for assembling the optical connector, and more particularly to a technique useful for connecting an optical fiber to a PC (Physical Contact).

  In recent years, with the spread of FTTH (Fiber To The Home) and the like, a large number of optical communication networks have been used in general homes. Connectors) have been developed and put into practical use (for example, Patent Documents 1 to 4).

In the optical connector described in Patent Document 1, a short optical fiber (hereinafter referred to as a built-in optical fiber) is attached in advance to a ferrule, and the optical fiber to be connected (hereinafter referred to as a connection optical fiber) is abutted against the built-in optical fiber. It is assembled by connecting. In this case, by polishing the end face of the built-in optical fiber together with the ferrule end face with high accuracy, a good PC connection with the connection destination (for example, an optical connector) is realized.
On the other hand, Patent Documents 2 to 4 disclose optical connectors having a built-in optical fiber-less structure. In the case of this type of optical connector, the PC connection with the connection destination is realized by using the pressing force generated by buckling the connecting optical fiber in the optical connector.

JP 2009-139981 A JP 2008-292710 A JP 2009-128422 A JP 2010-96981 A

However, in the optical connector described in Patent Document 1, it is necessary to polish the end face of the optical fiber together with the end face of the ferrule after the built-in optical fiber is mounted on the ferrule and positioned and fixed, so that the manufacturing cost becomes very high. There is.
In the optical connectors described in Patent Documents 2 to 4, if the pressing force generated by buckling the optical fiber is too weak, good PC connection cannot be obtained. Therefore, a matching sheet must be attached to the end face of the ferrule to reduce the return loss, or the end face of the connecting optical fiber must be polished into a specific shape.

  SUMMARY An advantage of some aspects of the invention is that it provides an optical connector and an optical connector assembling method capable of realizing good PC connection with a simple structure.

The invention according to claim 1 is a ferrule that holds one end of an optical fiber;
An optical fiber gripper that holds and fixes the optical fiber extending from the ferrule, and
The optical fiber is fixed by the optical fiber gripping portion in a state where the optical fiber protrudes from the tip of the ferrule by a predetermined protrusion amount ΔL,
When the connection destination and the optical fiber are connected, the optical fiber is pressed to the end face of the ferrule, and is elastically deformed without bending between the tip of the optical fiber and the fixed end of the optical fiber gripping portion. An optical connector characterized by the above.

  According to a second aspect of the present invention, in the optical connector according to the first aspect, when the distance from the tip of the optical fiber to the fixed end of the optical fiber gripping portion is L, the optical fiber is elastically deformed. The strain ΔL / L is 0.06% or more.

  According to a third aspect of the present invention, in the optical connector according to the first or second aspect, the protrusion amount ΔL is 10 μm or more and 30 μm or less.

  According to a fourth aspect of the present invention, in the optical connector according to any one of the first to third aspects, the optical fiber and the connection destination are PC-connected.

Invention of Claim 5 is the assembly method of the optical connector as described in any one of Claim 1 to 4, Comprising:
Inserting one end side of the optical fiber into the ferrule, and projecting from the tip of the ferrule longer than the projection amount ΔL;
A step of pushing back while bending the optical fiber by bringing a positioning member into contact with the tip of the optical fiber;
And a step of fixing the optical fiber by the optical fiber gripping portion when the protruding amount of the optical fiber reaches the protruding amount ΔL.

  According to the present invention, when the optical fibers are connected to each other by PC, a very large pressing force is generated by elastic deformation of the connecting optical fibers, so that good PC connection can be realized.

It is a figure which shows schematic structure of the optical connector which concerns on 1st Embodiment. It is a figure which shows the state of the optical connector when connecting with a connecting point and PC. It is a figure which shows the relationship of the distortion | strain (epsilon) of the connection optical fiber F1, and the pressing force F. FIG. It is a figure shown about an example of the assembly process of the optical connector 10 which concerns on 1st Embodiment. It is a figure shown about an example of the assembly process of the optical connector 10 which concerns on 1st Embodiment. It is a figure which shows schematic structure of the optical connector which concerns on 2nd Embodiment. It is a figure which shows the relationship between the space length (space | interval) in which the connection optical fiber F1 at the time of connecting with a connecting point and PC can bend, and buckling force (buckling load).

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[First Embodiment]
FIG. 1 is a diagram showing a schematic configuration of a mechanical splice type optical connector (for example, an SC connector) according to the first embodiment. In the present embodiment, a case where a single-core optical fiber in which a primary coating (for example, a UV resin coating, a coating outer diameter of 250 μm) is applied to a bare optical fiber having an outer diameter of 125 μm will be described as the connecting optical fiber F1.

As shown in FIG. 1, the optical connector 10 includes a ferrule 101, a base member 102, fiber pressing members 103 and 104, a clamp member 105, and the like.
The ferrule 101 is a substantially cylindrical member made of a ceramic material such as zirconia, for example, and has a pore 101a formed along the central axis. One end side of the connecting optical fiber F1 (the bare fiber portion from which the coating has been removed) is inserted and held in the pore 101a.

The base member 102 is a substantially semi-cylindrical member made of a resin material such as polyphenylene sulfide (PPS) or polyetherimide (PEI). The base member 102 includes a ferrule holding portion for holding the ferrule 101, a bare fiber holding portion for holding the bare fiber portion (portion from which the coating has been removed) of the connecting optical fiber F1, and a covering fiber portion (primary coating is applied to the connecting optical fiber F1). The coated fiber holding portion that holds the portion as is) is partitioned.
The ferrule holding portion of the base member 102 is formed with a flange portion 102a, and the ferrule 101 is fitted and held in the flange portion 102a. The base member 102 and the ferrule 101 may be bonded and fixed.

On the surfaces of the bare fiber holding portion and the coated fiber holding portion of the base member 102, fiber fixing grooves 102b and 102c having a V-shaped cross section are formed along the longitudinal direction. The fiber fixing grooves 102b and 102c may be U-shaped or trapezoidal in cross section, and are not particularly limited as long as the connecting optical fiber F1 can be sandwiched and fixed between the fiber pressing members 103 and 104.
Specifically, the fiber fixing groove 102b on which the bare fiber portion of the connection optical fiber F1 is placed is a small-diameter groove corresponding to the outer diameter (for example, 125 μm) of the bare optical fiber, and the coated fiber portion is placed. The fiber fixing groove 102c is a large-diameter groove corresponding to the coating outer diameter (for example, 250 μm) of the connecting optical fiber F1. Further, the entrance of the fiber fixing groove (groove for large diameter) 102c is expanded toward the outside so that the connection optical fiber F1 can be easily inserted.

  The fiber pressing members 103 and 104 are lid members made of, for example, a resin material such as PPS or PEI, and are disposed to face the fiber fixing grooves 102b and 102c of the base member 102. Specifically, the fiber holding member 103 is placed on the base member 102 so as to cover the fiber fixing groove (small diameter groove) 102b, and the fiber holding member 104 covers the fiber fixing groove (large diameter groove) 102c. Is mounted on the base member 102. A space sandwiched between the inner surfaces of the fiber pressing members 103 and 104 and the fiber fixing grooves 102b and 102c of the base member 102 is an insertion path of the connection optical fiber F1.

The clamp member 105 is a member having a C-shaped cross section (a U-shape) made of a metal material such as stainless steel, and a part of the side surface is opened. The clamp member 105 presses and holds the fiber pressing members 103 and 104 placed on the base member 102. At this time, the joint surface between the base member 102 and the fiber retainer member 103 and the joint surface between the base member 102 and the fiber retainer member 104 are exposed to the outside from the opening of the clamp member 105, and a wedge (not shown) can be inserted. Become.
The bare fiber portion of the connecting optical fiber F1 is held by the base member 102 and the fiber pressing member 103, and the coated fiber portion of the connecting optical fiber F1 is held and fixed by the base member 102 and the fiber pressing member 104. That is, the base member 102, the fiber pressing members 103 and 104, and the clamp member 105 constitute an optical fiber gripping part that holds and fixes the connection optical fiber F1 extending from the fail 101.

An optical fiber mounting portion in which the ferrule 101, the fiber pressing members 103 and 104, and the clamp member 105 are attached to the base member 102 is fixed to the frame 106 while being pressed with a constant load by the coil spring 107. Specifically, the coil spring 107 and the stop ring 108 are disposed at the rear end of the base member 102, and the coil spring 107 is compressed by moving the stop ring 108 forward (to the ferrule 101 side). Then, by locking the locking piece of the stop ring 108 in the locking hole of the frame 106, the optical fiber connection portion 11 is fixed to the frame 106 in a pressed state.
A so-called housing is configured by the frame 106 and the stop ring 108, and the tip of the frame 106 serves as an interface with a connection destination (for example, an optical connector). Further, a slider 109 is slidably disposed on the outside of the frame 106 and the stop ring 108 to constitute a so-called slide lock structure.

In the present embodiment, the connection optical fiber F1 is fixed by the optical fiber gripping portion in a state where the connection optical fiber F1 protrudes from the tip of the ferrule 101 by a predetermined protrusion amount ΔL. Further, in the optical fiber gripping portion, the connecting optical fiber F1 is fixed so that it cannot be elastically deformed as well as moved in the longitudinal direction.
Therefore, as shown in FIG. 2, when the PC is connected to the connection destination (for example, an optical connector), the connection optical fiber F <b> 1 is pushed back to the end face of the ferrule 101. At this time, the connection optical fiber F1 is elastically deformed without being bent between the front end of the connection optical fiber F1 and the fixed end P of the optical fiber gripping portion (distance L). That is, the connecting optical fiber F1 is elastically deformed from the tip to the fixed end P of the optical fiber gripping part to absorb the protrusion amount ΔL.

  Here, the pressing force F generated by the elastic deformation of the connection optical fiber F1 is defined as E, the Young's modulus of the bare optical fiber of the connection optical fiber F1, S as the cross-sectional area, and ε (= ΔL / L) as the strain. Where F = ε × S × E. When the bare optical fiber diameter of the connecting optical fiber F1 is 125 μm and the Young's modulus E is 72 GPa, the relationship between the strain ε and the pressing force F of the connecting optical fiber F1 is as shown in FIG.

  Generally, in order to realize a good PC connection, the pressing force F is required to be 0.5 N or more. In order to satisfy this, as shown in FIG. 3, the strain ε of the connecting optical fiber F1 should be 0.06% or more. That is, in the optical connector 10, from the tip of the connection optical fiber F1 to the fixed end P of the optical fiber gripping portion so that the strain ε of the connection optical fiber F1 when connecting to the connection destination and the PC is 0.06% or more. Distance L and the protrusion amount ΔL of the connecting optical fiber F1 are set.

  However, if the protrusion amount ΔL of the connection optical fiber F1 is too large, the end surface of the connection optical fiber F1 is easily damaged and handling becomes difficult. Therefore, it is desirable that the protrusion amount ΔL of the connection optical fiber F1 is 30 μm or less. Further, since the distance L from the distal end of the connection optical fiber F1 to the fixed end P of the optical fiber gripping portion is limited due to the structure of the optical connector 10, the protrusion amount ΔL of the connection optical fiber F1 is preferably 10 μm or more. .

In the optical connector 10 of the present embodiment, the fiber insertion / extraction port formed by the base member 102 and the fiber pressing member 103 to facilitate the insertion of the connection optical fiber F1 is directed forward (to the tip side of the optical connector 10). On the contrary, the diameter of the fiber insertion port of the ferrule 101 is reduced toward the front. That is, since the inner diameter of this portion is larger than the diameter of the bare optical fiber of the connection optical fiber F1, it can be said that a space in which the connection optical fiber F1 can be bent is formed.
In order that the connection optical fiber F1 does not bend when the connection destination is connected to the PC, it is preferable that there is no such bendable space. However, if a space in which the connecting optical fiber F1 can be bent is formed due to the configuration of the parts, the space length may be adjusted to be appropriately shortened. For example, in the case of a bare optical fiber having an outer diameter of 125 μm, if the space length is 5 mm or less, it does not buckle even when a force of 1 N is applied (see FIG. 7). In FIG. 7, the buckling force P of the optical fiber is expressed by P = 4π ² EI / L ² (E: Young's modulus of optical fiber, I: second moment of section, L: length of optical fiber). In the case of a bare optical fiber having an outer diameter of 125 μm, E = 76 GPa and I = 1.2 × 10 ⁻¹⁷ m ⁴ .

  In order to prevent the connecting optical fiber F1 from being displaced in the longitudinal direction when the connecting optical fiber F1 is connected to the connection destination by the PC, the connecting optical fiber F1 and the base are used by the pressing force F generated by elastic deformation of the connecting optical fiber F1. It is necessary to increase the frictional force between the member 102 and the fiber pressing member 103 (= μN, μ: friction coefficient of the member, N: clamping force).

4 and 5 are diagrams illustrating an example of an assembly process of the optical connector 10 according to the first embodiment. Here, the case where the protrusion amount ΔL of the connection optical fiber F1 is controlled using the positioning member 53 will be described.
As shown in FIGS. 4 and 5, the positioning member 53 is a lid member that can be fitted into an engagement space provided at the tip of the optical connector 1 for attaching a split sleeve or the like. The positioning member 53 includes a first inner diameter portion 53a having a first inner diameter substantially the same as the outer diameter of the ferrule 11, and a second inner diameter smaller than the first inner diameter and larger than the bare optical fiber diameter of the connecting optical fiber F1. An inner diameter portion 53b is continuously provided in a step shape. Further, the height of the second inner diameter portion 53b is set according to the protrusion amount ΔL of the connection optical fiber F1.

When assembling the optical connector 10, first, the jacket is removed from the tip of the connection optical fiber F1 by a predetermined length (for example, 20 to 25 mm). The protruding amount of the connection optical fiber F1 is determined by the jacket removal length at this time.
On the other hand, in the main body of the optical connector 10, the fiber pressing members 103 and 104 are arranged to face the fiber fixing grooves 102 b and 102 c of the base member 102 to which the ferrule 101 is fixed. Further, the clamp member 105 is fitted around the base member 102 and the fiber pressing members 103 and 104 to assemble the optical fiber mounting portion. This optical fiber mounting portion is inserted into the frame 106 and fixed with a stop ring 108 via a coil spring 107. Then, a wedge (not shown) is pushed into the joint surface between the base member 102 exposed to the outside and the fiber pressing members 103 and 104, and the joint surface is slightly separated so that the connecting optical fiber F1 can be inserted. .

  Next, as shown in FIG. 4, the connection optical fiber F <b> 1 from which the outer sheath of the tip portion has been removed is inserted into the optical connector 1 along the guide member 51. Specifically, the connecting optical fiber F1 is inserted until the end surface of the coated fiber portion of the connecting optical fiber F1 reaches the small diameter groove 102b of the base member 102 and cannot be inserted any more. At this time, the tip of the connection optical fiber F1 is in a state of protruding from the tip of the ferrule 11 longer than ΔL. In this state, the connection optical fiber F1 is held and fixed by the guide lid 52.

  Next, after dust attached to the end face of the connection optical fiber F1 is removed with air or the like, as shown in FIG. 5, the positioning member 53 is fitted into the distal end portion of the optical connector 1, and the first inner diameter portion 53a and the second inner diameter The stepped portion that becomes the boundary of the portion 53 b is inserted until it hits the end face of the ferrule 101. Since the connection optical fiber F1 is pressed by the guide lid 52 and fixed to the guide member 51, the connection optical fiber F1 is bent when pushed back by the positioning member 53. In this state, the wedge is removed, and the connecting optical fiber F1 is fixed to the optical connector 10.

The positioning member 53 is removed, and the assembly of the optical connector 10 is completed. The connecting optical fiber F1 protrudes from the end face of the ferrule 101 by the height of the second inner diameter portion 53b of the positioning member 53. That is, if the height of the second inner diameter portion 53b is set to ΔL, the final protrusion amount of the connection optical fiber F1 can be easily controlled to ΔL.
Note that it is desirable to clean the end face of the connection optical fiber F1 when making a PC connection with the connection partner.

As described above, the optical connector 10 according to the first embodiment includes a ferrule 101 that holds one end of the connection optical fiber F1, and an optical fiber gripping part (base member) that holds and fixes the connection optical fiber F1 extending from the ferrule 101. 102, fiber pressing members 103 and 104, and a clamp member 105). Further, the connection optical fiber F1 is fixed by the optical fiber gripping portion in a state where the connection optical fiber F1 protrudes from the tip of the ferrule 101 by a predetermined protrusion amount ΔL.
When the connection destination (for example, the optical connector) and the connection optical fiber F1 are connected to the PC, the connection optical fiber F1 is pressed to the end face of the ferrule 101, and the fixed end P of the optical fiber gripping portion from the tip of the connection optical fiber F1. Elastic deformation without bending between
According to the optical connector 10, a very large pressing force can be obtained by a simple structure in which the connection optical fiber F1 is protruded from the end face of the ferrule 101 by a predetermined protrusion amount ΔL, and good PC connection is realized. Can do.

  Further, in the optical connector 10, since the strain ε (= ΔL / L) when the connecting optical fiber F1 is elastically deformed is 0.06% or more, a pressing force of 0.5 N or more can be reliably obtained. As a result, a good PC connection is realized.

[Second Embodiment]
FIG. 6 is a diagram illustrating a schematic configuration of the optical connector according to the second embodiment. In FIG. 6, the same or corresponding components as those of the optical connector 10 of the first embodiment are denoted by reference numerals in which the leading numeral is replaced with “2”, and redundant description is omitted.

In the optical connector 20 of the second embodiment, the ferrule 201 is a covered cylindrical member, and a pore 201a is formed in the lid portion along the central axis. A coating removal member 210 that removes the coating of the connection optical fiber F1 when the connection optical fiber F1 is inserted into the hollow portion of the ferrule 201 with a predetermined pressing load, and the connection optical fiber F1 as a coating removal member 210 A fiber guide member 211 for guiding is incorporated.
The sheath removing member 210 and the fiber guide member 211 may be members different from the ferrule 201 or may be molded integrally with the ferrule 201. Further, the fiber guide member 211 can be omitted.

The coating removal member 210 is made of, for example, a metal material such as stainless steel, a ceramic material such as zirconia, or a synthetic resin material such as PPS, and is capable of passing through the bare optical fiber of the connection optical fiber F1 along the central axis. A fiber insertion hole 210a is formed. The bare optical fiber insertion hole 210a is formed to be larger than the bare optical fiber diameter of the connection optical fiber F1 and smaller than the coating outer diameter of the connection optical fiber F1. That is, when the connection optical fiber F1 is to be inserted into the coating removal member 210, the coating of the connection optical fiber F1 comes into contact with the peripheral edge of the insertion port of the bare optical fiber insertion hole 210a, and the coating is peeled off and removed when further pressed. It has become.
The detailed configuration of the coating removal unit 210 is disclosed in Japanese Patent Application No. 2010-127235 filed earlier by the present applicant.

  The fiber guide member 211 is a part that guides the connection optical fiber F1 to the coating removal member 211. The fiber guide member 211 has a substantially cylindrical shape, and is formed with a coated fiber insertion hole 211a through which the coated fiber portion of the connection optical fiber F1 can be inserted along the central axis. That is, the coated fiber insertion hole 211a is formed larger than the coated outer diameter of the connection optical fiber F1.

  The coating removal member 210 and the fiber guide member 211 are arranged apart from each other by a predetermined length in a state where the central axes of the bare fiber insertion hole 210a and the coated fiber insertion hole 211a coincide. In the space between the coating removal member 210 and the fiber guide member 211, the coating from which the connection optical fiber F1 has been removed is accommodated.

  In the second embodiment, the base member 102 is partitioned into a ferrule holding part that holds the ferrule 201 and a coated fiber holding part that holds the coated fiber part of the connection optical fiber F1. A convex portion 202 a is formed in the ferrule holding portion of the base member 102, and the ferrule 201 is held by inserting the convex portion 202 a into the hollow portion of the ferrule 101.

A fiber fixing groove 202c is formed on the surface of the coated fiber holding portion of the base member 202 along the longitudinal direction. The fiber fixing groove 102c is a large-diameter groove corresponding to the coating outer diameter (for example, 250 μm) of the connection optical fiber F1. The entrance of the fiber fixing groove (groove for large diameter) 202c is expanded toward the outside so that the connection optical fiber F1 can be easily inserted.
A fiber pressing member 203 is disposed opposite to the fiber fixing groove 202c of the base member 202. A space sandwiched between the inner surface of the fiber pressing member 203 and the fiber fixing groove 202c of the base member 202 becomes an insertion path of the connection optical fiber F1.

  The optical connector 20 is assembled in the same manner as the optical connector 10 of the first embodiment. At this time, when the connection optical fiber F1 is press-fitted into the coating removal member 210 along with the insertion operation of the connection optical fiber F1, the coating of the connection optical fiber F1 is automatically removed. Therefore, the assembly work of the optical connector 20 is greatly facilitated.

In the optical connector 20, as in the optical connector 10 of the first embodiment, the optical fiber gripping portion (base member 202, fiber pressing member) with the connection optical fiber F 1 protruding from the tip of the ferrule 201 by a predetermined protrusion amount ΔL. 203 and a clamp member 205).
When the connection destination (for example, an optical connector) and the connection optical fiber F1 are connected to the PC, the connection optical fiber F1 is pressed to the end surface of the ferrule 201, and the fixed end P of the optical fiber gripping portion from the tip of the connection optical fiber F1. Elastic deformation without bending between
According to the optical connector 20, a very large pressing force can be obtained by a simple structure in which the connection optical fiber F1 is protruded from the end face of the ferrule 201 by a predetermined protrusion amount ΔL, and good PC connection is realized. Can do.

  Further, in the optical connector 20, from the tip of the connection optical fiber F1 to the fixed end P of the optical fiber gripping portion so that the strain ε of the connection optical fiber F1 when connecting to the connection destination to the PC is 0.06% or more. Distance L and the protrusion amount ΔL of the connecting optical fiber F1 are set. In this case, unlike the first embodiment, the bare fiber portion and the coated fiber portion are mixed in the portion from the tip of the connection optical fiber F1 to the fixed end P of the optical fiber gripping portion, but the connection destination and the PC are connected. In this case, the Young's modulus of the coating material is extremely small compared to the Young's modulus of glass, and can be ignored.

As mentioned above, although the invention made by this inventor was concretely demonstrated based on embodiment, this invention is not limited to the said embodiment, It can change in the range which does not deviate from the summary.
For example, in the second embodiment, the coating removal member 210 and the fiber guide member 211 are built in the ferrule 201. However, the coating removal member 210 and the fiber guide member 211 are placed on the base member 202 and fixed. May be. In this case, the coating removing member 210 and the fiber guide member 211 may be separate members from the base member 202, or may be molded integrally with the base member 202.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

10 optical connector 101 ferrule 101a pore 102 base member 102a flange 102b fiber fixing groove (groove for small diameter)
102c Fiber fixing groove (groove for large diameter)
103 Fiber holding member 104 Fiber holding member 105 Clamp member 106 Frame 107 Coil spring 108 Stop ring 109 Slider F1 Connecting optical fiber

Claims (5)

A ferrule that holds one end of the optical fiber;
An optical fiber gripper that holds and fixes the optical fiber extending from the ferrule, and
The optical fiber is fixed by the optical fiber gripping portion in a state where the optical fiber protrudes from the tip of the ferrule by a predetermined protrusion amount ΔL,
When the connection destination and the optical fiber are connected, the optical fiber is pressed to the end face of the ferrule, and is elastically deformed without bending between the tip of the optical fiber and the fixed end of the optical fiber gripping portion. Optical connector characterized by.   The strain ΔL / L when the optical fiber is elastically deformed is 0.06% or more, where L is the distance from the tip of the optical fiber to the fixed end of the optical fiber gripping portion. Item 4. The optical connector according to Item 1.   The optical connector according to claim 1, wherein the protrusion amount ΔL is 10 μm or more and 30 μm or less.   The optical connector according to any one of claims 1 to 3, wherein the optical fiber and the connection destination are PC-connected. An optical connector assembling method according to any one of claims 1 to 4,
Inserting one end side of the optical fiber into the ferrule, and projecting from the tip of the ferrule longer than the projection amount ΔL;
A step of pushing back while bending the optical fiber by bringing a positioning member into contact with the tip of the optical fiber;
And a step of fixing the optical fiber by the optical fiber gripping portion when the protruding amount of the optical fiber reaches the protruding amount ΔL.

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