JP2001208929A - Optical fiber fixing member and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical fiber fixing member capable of easily performing its fixing work without damaging optical fiber. SOLUTION: The optical fiber fixing member is provided with a base member 4 having a groove part 4a of a V-shaped cross section and pressing members 106, 107 for fixing a coated optical fiber 105 (optical fiber 105a) which is pressed against the base member 4 and to be housed in the groove part 4a. The groove part 4a is provided with an optical fiber storing part 4b for storing and fixing the optical fiber 105a, a coated layer storing part 4c for storing a part in which the coated layer 105b of the coated optical fiber 105 is formed, an optical fiber guide part 4d formed between 4c and 4b, a first deep groove part 4e formed between the coated layer storing part 4c and the optical fiber guide part 4d, and a second deep groove part 4f formed in mid-way of the coated layer storing part 4c. Depths of the grooves of the first deep groove part 4e and the second deep groove part 4f are both deeper than the depth of the groove of the coated layer storing part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical fiber fixing member for fixing an end of an optical fiber having an optical fiber and a coating layer formed around the optical fiber, a method for manufacturing the same, and an optical connector.

[0002]

2. Description of the Related Art When handling an optical fiber, it may be necessary to fix the end of the optical fiber. For example, when optical fibers are optically connected to each other, there is a case where connection loss is reduced by accurately positioning and fixing each end. For example, a connection using a mechanical splice corresponds to the ease of the connection work. As a connection method using a mechanical splice, JP-A-9-297242
And Japanese Unexamined Patent Application Publication No. 10-170748 are known. FIG. 4 shows an example of the mechanical splice. The mechanical splice 100 shown in FIG. 4 is such that a pair of optical fiber cores having an optical fiber exposed at the distal end are inserted from both ends, and the optical fiber is fixed with the end faces of the optical fibers abutting inside. It is a kind of member.

An optical connector having a connection structure using a mechanical splice described above has been put to practical use. Such an optical connector is disclosed in Japanese Patent Application Laid-Open No. H10-170756.
And the like are known. An optical connector 101 of this type is shown in FIGS. FIG. 5 shows the appearance of the optical connector 101, FIG. 5 (a) is a front view, and FIG.
Is a plan view, and FIG. 5C is a left side view (the optical connection surface side of the optical connector). FIG. 6 is a sectional view taken along the line AA in FIG.

As shown in FIGS. 5 and 6, an optical connector 101 has a ferrule 102 made of zirconia having an optical connection surface 102a at a tip. This ferrule 1
The short optical fiber 103 is fixed in the inside of the optical fiber 02 by an adhesive. The base end of the ferrule 102 is connected to a base member 104, and the short optical fiber 103 extending from the inside of the ferrule 102 is
04 is housed in a groove 104a having a V-shaped cross section formed on the upper surface.

In the groove 104a, an optical fiber core 10 inserted into the optical connector 101 from the right in the figure is inserted.
5 optical fibers 105a are also accommodated. Optical fiber 10
5 a is exposed at the tip of the optical fiber core 105. End face of short optical fiber 103 and optical fiber 105a
The end faces of the optical fibers 103 and 105a are fixed by being pressed by the optical fiber pressing member 106 from above in the groove 104a. Groove 1
Reference numeral 04a denotes a portion where the coating layer of the optical fiber core 105 is formed on the side where the optical fiber core 105 is inserted. This portion is pressed from above by the coating layer pressing member 107, and the optical fiber core wire 105 is fixed.

The clamp member 108 having a spring property is used.
Sandwiches the optical fiber pressing member 106, the coating layer pressing member 107, and the base member 104. Due to the elastic restoring force of the clamp member 108, the optical fiber pressing member 1
06 and the coating layer pressing member 107 are pressed against the base member 104 to fix the short optical fiber 103 and the optical fiber core 105 (optical fiber 105a). The mechanical splice 100 shown in FIG. 5 described above employs a substantially similar fixing method.

[0007] As shown in FIG.
By inserting the wedge 110 into the wedge insertion hole 109 of
A gap can be formed between the optical fiber pressing member 106 and the coating layer pressing member 107 and the base member 104. When a gap is formed in this manner (FIG. 8)
(Refer to (a)).
5a) is inserted from the right side in FIG. 6, the wedge 110 is removed, and the optical fiber 105a is fixed (see FIG. 8B), and the end of the optical fiber core 105 is connected to the optical connector 101.
Can be Note that the optical connector 101 described here is an SC type connector having coupling compatibility with a so-called SC connector, and FIG. 7 also shows a knob 111 and a boot 112 when the SC connector is used.

[0008]

However, the fixing member (optical connector 10) for the optical fiber core 105 as described above.
Since 1) had the following inconveniences, further improvement was demanded.

As described above, the optical fiber pressing member 10
The optical fiber 105a exposed at the tip by the base member 6 and the base member 104 is sandwiched and fixed. Further, the portion where the coating layer 105b is formed is sandwiched and fixed by the coating layer pressing member 107 and the base member 104. As a result, the entire end of the optical fiber core 105 is fixed. At this time, the groove 10 having a V-shaped cross section
4a and optical fiber core wire 105 (optical fiber 105a)
9 is shown in FIG. FIG. 9A is a cross-sectional view at the center of the groove 104a, and FIG. 9B is a plan view of the groove 104a. The length of the groove 104a is shorter than that shown in FIG. 6 for ease of explanation.

As can be seen from FIG. 9, in such an optical connector (fixing member) 101, an optical fiber
At the time of fixing the end portion 05, both the optical fiber 105a and the portion where the coating layer 105b is formed are positioned and fixed. For this reason, the groove 104a is
In order to cope with the difference in outer diameter between the optical fiber 105a and the coating layer 105b, the optical fiber receiving portion 104b for fixing the optical fiber 105a and the coating layer receiving portion 1 for fixing the portion where the coating layer 105b is formed.
04c, the depth is changed. Needless to say, the optical fiber housing portion 104b is provided with the coating layer housing portion 104c.
The groove depth is shallower than that.

An optical fiber 10 inserted between the optical fiber housing portion 104b and the coating layer housing portion 104c.
Optical fiber guide 104d for smoothly guiding 5a
Is also formed. The groove depth of the optical fiber guiding portion 104d is gradually changed from the groove depth of the optical fiber housing portion 104b to the groove depth of the coating layer housing portion 104c. The cross-sectional shapes of the optical fiber housing portion 104b and the coating layer housing portion 104c are as follows:
As described above, the optical fiber 105a and the coating layer 105b are pressed against the columnar optical fiber 105a and the coating layer 105b, so that the entire end of the optical fiber core wire 105 is formed. Can be accurately positioned.

The end of the optical fiber core 105 is fixed as described above and connected to the optical component on the other side (here, the short optical fiber 103). In order to suppress the connection loss, accurate positioning is performed. Must be done. For this reason,
Particularly, high dimensional accuracy and high surface accuracy are required for the optical fiber housing portion 104b of the groove portion 104a. Further, if the optical fiber core wire 105 is bent, a loss occurs (bending loss), so that the optical fiber housing portion 104b and the coating layer housing portion 1 are bent.
04c needs to be formed such that their central axes coincide. Furthermore, the inner surface of the groove 104a needs to be formed with a surface with little unevenness so that the optical fiber 105a is not caught when the optical fiber core 105 is inserted.

[0013] The optical fiber 105a is
Even when the optical fiber housing 104b is pressed and aligned, the unevenness of the inner surface of the optical fiber housing 104b affects the transmission loss. That is, if the inner surface of the optical fiber housing 104b has irregularities, a minute bent portion (microbend) is generated in the optical fiber 105a, and transmission loss is deteriorated. Optical fiber 105a
Depending on the length of pressing the optical fiber housing 104b,
The surface roughness (maximum height) Rmax of the inner surface is preferably 1 μm or less.

In most cases, the base member 104 is a resin molded product, and is formed by a mold. Therefore, the surface roughness of the inner surface of the groove 104a depends on the state of the surface of the mold. If the mold is manufactured by electric discharge machining, the surface roughness (maximum height) Rmax of the inner surface of the groove 104a
Is undesirably 4 to 6 μm, and the flatness is 10 μm or more. On the other hand, when the mold is not a discharge machining but a grinding process and a polishing finish, the surface roughness (maximum height) Rm of the inner surface of the groove portion 104a.
ax can be less than 1 μm and flatness can be less than 1 μm.
In short, a high-precision groove for a high-performance optical fiber fixing member is essential, but the groove 104 having a fine V-shaped cross section is required.
In order to form a, a mold having a high-precision V-shaped projection is required.

However, in the grinding process, it is difficult to integrally process convex portions having different heights. Therefore, FIG.
As shown in the figure, the mold is formed by a mold 113 having a convex portion for forming the optical fiber housing portion 104b and a coating layer housing portion 104c.
It is inevitable to take a method of separately processing and assembling the mold 114 having the convex portion for forming.

However, it is very difficult to completely match the dies 113 and 114 (without deviation of several μm). Further, since the molds 113 and 114 slightly expand due to heat at the time of molding, a slight gap is easily formed at the boundary between the molds 113 and 114. Further, as shown in part B in FIG.
A gap is also formed due to the wear of the edge of No. 4.
In order to improve the dimensional stability of the molded product, it is common to mix a glass filler into the resin. In such a case, the edges of the dies 113 and 114 are easily shaved by the glass filler, and the , 114 are more likely to be worn.

As a result, as shown in FIG. 11A, forming burrs 115 (about 20 to 30 μm in height) are formed in the groove 104a of the formed base member 104.
When such molding burrs 115 occur, the optical fiber core 105 is obstructed when the optical fiber core 105 is inserted. Also, when such molding burrs 115 occur,
When the optical fiber core 105 is inserted, not only is the insertion hindered, but in the worst case, the end face of the optical fiber 105a is damaged by the molding burr 115, so that the connection loss deteriorates. Also, as described above, the mold 11
Since it is very difficult to make the 3,114s completely coincide with each other, a gap G (about 10 μm at maximum) as shown in FIG. 11B may actually occur. Such a case is not preferable because the end face of the optical fiber 105a is damaged by the gap G.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an optical fiber fixing member capable of easily fixing an optical fiber without damaging the optical fiber, an optical connector using the optical fiber fixing member, and an optical fiber fixing member. A method of manufacturing a member.

[0019]

According to a first aspect of the present invention, there is provided an optical fiber fixing member for fixing an end of an optical fiber having a coating layer around the optical fiber, and exposing the optical fiber to the end. A base member having a groove having a V-shaped cross-section for accommodating the formed optical fiber core, and a pressing member disposed opposite to the groove and pressed against the base member to fix the optical fiber core housed in the groove. And a member. And, the groove portion is an optical fiber housing portion for housing and fixing the optical fiber exposed at the tip of the optical fiber core wire, the coating layer housing portion for housing the portion where the coating layer of the optical fiber core wire is formed, and both of them. And an optical fiber guide formed between them. The groove depth of the optical fiber housing is shallower than the groove depth of the coating layer housing, and the depth of the optical fiber guide is gradually changed from the groove depth of the coating layer housing to the groove depth of the optical fiber housing. I have. And the above-mentioned groove part is a first deep groove part deeper than the groove depth of the coating layer accommodation part formed between the coating layer accommodation part and the optical fiber guide part, and the coating formed in the middle of the coating layer accommodation part. And a second deep groove portion that is deeper than the groove depth of the layer accommodating portion.

The optical connector according to the second aspect is the first aspect.
And a ferrule having an optical connection surface at the distal end, housed and fixed inside the ferrule, exposing the distal end surface to the optical connection surface, and fixing the base end side of the optical fiber to the groove. It is characterized by comprising a short optical fiber housed inside the portion and an elastic member for urging the ferrule toward the optical connection surface.

According to a third aspect of the present invention, there is provided a method for manufacturing an optical fiber fixing member according to the first aspect of the present invention, wherein at least a groove from the coating layer housing to the optical fiber housing is formed. It is characterized by being formed by three dies, and arranging a mold crack between the dies in the first deep groove and the second deep groove, respectively.

[0022]

Embodiments of the present invention will be described below with reference to the drawings. The fixing member of the present embodiment includes:
It is an optical connector having a mechanical splice structure inside. The configuration of the optical connector of this embodiment is substantially the same as that of the optical connector 101 shown in FIGS. 5 and 6 described above. The optical connector of this embodiment is different from the optical connector 101 shown in FIGS. 5 and 6 only in the shape of the portion corresponding to the groove 104a. Therefore, in the following, the groove 1
A detailed description of components other than the portion corresponding to the groove 104a will be omitted, and only a detailed description of the portion corresponding to the groove 104a will be given. 5 and 6, the reference numeral used in the description is the groove 104a on the base member 104 in the optical connector 101 shown in FIGS. 5 and 6, but in the present embodiment, the corresponding portion is described as the groove 4a on the base member 4. I do. Note that components other than the base member 4 are shown in FIG.
The same components as those of the optical connector 101 shown in FIG. 6 will be described using the same reference numerals.

FIG. 1 shows a groove 4a on the base member 4 in this embodiment. FIG. 1A is a sectional view, and FIG. 1B is a plan view. Similarly to the groove 104a shown in FIG. 9, the groove 4a of the present embodiment also includes an optical fiber housing 4b for housing and fixing the optical fiber 105a exposed at the tip of the optical fiber core 105, and the optical fiber core 105 There is provided a coating layer housing portion 4c for housing a portion where the coating layer 105b is formed, and an optical fiber guide portion 4d formed between the both. The groove 4a of the present embodiment is
A first deep groove 4e is provided between the optical fiber guide 4d and the optical fiber guide 4d. Further, the groove 4a of the present embodiment also has a second deep groove 4f in the middle of the coating layer housing 4c.

The groove depth of the optical fiber housing portion 4b is smaller than the groove depth of the coating layer housing portion 4c, and the depth of the optical fiber guide portion 4d is determined from the groove depth of the coating layer housing portion 4c. Is gradually changed to the groove depth. Further, the groove depth of each of the first deep groove portion 4e and the second deep groove portion 4f is set to be deeper than the groove depth of the coating layer housing portion 4c. Each of these grooves has a similar V-shaped cross section.

Since at least the optical fiber housing 4b and the coating layer housing 4c have a V-shaped cross section, the optical fiber core 105 (the optical fiber 105) is inserted inside the groove 4a.
a) When the optical fiber pressing member 1 is housed from above,
06 and the covering layer pressing member 107, the optical fiber core 105 (optical fiber 105a) is aligned and fixed. In addition, an insertion portion 4g having a semicircular cross-sectional shape is formed at a further base end side of the groove portion 4a (a further base end side of the coating layer housing portion 4c). The inserted optical fiber 105a is smoothly inserted into the groove 4 by the insertion portion 4g.
a.

The base member 4 and the optical fiber pressing member 106 integrated by a pair of clamp members 108
The coating layer pressing member 107 is accommodated in a cylindrical stop ring 117 (see FIG. 6). A coil spring 118 is attached to the base end side of the integrated base member 4, the optical fiber pressing member 106, and the coating layer pressing member 107, and the integrated base member 4, the optical fiber pressing member 106, and the coating layer. The pressing member 107 and the entire ferrule 102 are urged toward the distal end of the optical connector 101.

At the distal ends of the optical fiber pressing member 106 and the ferrule 102, a plug frame 116 is fitted to the stop ring 117.
The optical fiber pressing member 106, the coating layer pressing member 107 and the entire ferrule 102 are held inside the optical connector 101. The ferrule 10 is moved by the coil spring 118.
Good optical connection is realized by pressing the second optical connection surface 102a against the optical component on the other side.

As shown in FIG. 2, the coating layer housing 4c
The groove 4a extending from the groove 4a to the optical fiber housing 4b is formed by three molds X, Y and Z. The mold cracks between the molds (that is, the mold cracks α between the mold X and the mold Y and the mold cracks β between the mold Y and the mold Z)
The first deep groove portion 4e and the second deep groove portion 4f are arranged at positions where they are to be formed.

As shown in FIG. 3, molding burrs 115 are inevitably formed at the mold cracks α and β.
Shows only the mold cracking part α). Molding burr 115
Is formed for the same reason as described with reference to FIG. However, in this embodiment,
The molding burr 115 due to the mold cracking part α has the first deep groove 4e.
And the molding burr due to the mold cracking part β is also in the second deep groove part 4f.
Will be located. Therefore, the tip of the inserted optical fiber 105a does not come into contact with the molding burr 115 (see FIG. 3A). As a result, the optical fiber core 10
The insertion workability of the optical fiber core 105 is improved without preventing the insertion of the optical fiber 5. Optical fiber 1
05a is not damaged and the transmission characteristics are not deteriorated. Further, the work of fixing the end of the optical fiber core wire 105 becomes easy to perform.

Also, as shown in FIG. 3B, when the dies cannot be completely aligned at the time of positioning, and a gap G is generated, the tip of the inserted optical fiber 105a is also used. Does not come into contact with the molding burr 115. Here, the depth d of the first deep groove portion 4e and the second deep groove portion 4f with respect to the coating layer housing portion 4c is equal to the gap G described above.
In consideration of this, it is preferable that the thickness be 0.1 mm or more. Although only the first deep groove 4e is shown in FIG. 3, the same applies to the second deep groove 4f.

Further, here, the dies X and Y are manufactured by grinding and polishing. The molds X and Y are sections for molding a portion having a substantially constant groove depth of the groove 4a, and the mold itself is not a complicated shape. In this way, the dies X and Y are divided and subjected to grinding and polishing, whereby the dimensional accuracy and the surface accuracy of the dies X and Y can be made high. As a result, the dimensional accuracy and the surface accuracy of the distal end sides of the optical fiber housing portion 4b and the coating layer housing portion 4c can be made high.

Since the optical fiber housing 4b can be formed with high precision, the optical fiber 105a can be accurately positioned.
In addition, since the coating layer housing portion 4c can be formed with high accuracy, the optical fiber core 105 is not bent and the bending loss is not increased. Further, the grinding and polishing finish allows the optical fiber housing 4
The surface roughness of the inner surface of b (coating layer housing 4c) can be reduced, and microbend loss can also be suppressed.

On the other hand, the mold Z has an insertion portion 4g having a semicircular cross section.
Since it is used to mold a complicated shape portion that shifts from the V-shaped cross section to the coating layer housing portion 4c, it is manufactured by electric discharge machining. Since the base end side of the groove 4a formed by the mold Z is a part that is not so important in terms of accuracy, there is no problem if it is manufactured by electric discharge machining. By dividing the mold in this way, it is possible to employ optimal mold processing corresponding to each part of the groove 4a, and as a result, deterioration of transmission loss does not increase.

The above-described optical connector 1 of the present embodiment
In 01, the material of the base member 4 is a thermosetting epoxy resin containing glass filler. Ferrule 102
Is made of zirconia or crystallized glass. The short optical fiber 103 is an SM (single mode) optical fiber or a GI (graded index) optical fiber having an outer diameter of 0.125 mm. The core diameter of the SM optical fiber is 10 μm, and the core diameter of the GI optical fiber is 50 μm or 62.5 μm. The plug frame 116 is made of PBT (polybutylene terephthalate)
It is made. The stop ring 117 is formed of any of PPS (polyphenylene sulfide), PBT, brass, and stainless steel.

The present invention is not limited to the above embodiment. For example, with respect to the optical fiber fixing member according to the first aspect, the above-described embodiment is an optical connector, but it may be a simple mechanical splice or another optical component. In the above-described embodiment, two members, the optical fiber pressing member 106 and the coating layer pressing member 107, are set as members for pressing the optical fiber core wire 105. However, these members are configured by one continuous member. Is also good.

[0036]

As described above, the optical fiber fixing member and the optical connector according to the present invention have a base member having a groove having a V-shaped cross section, and an optical fiber core (optical fiber) pressed against the base member and housed in the groove. And a pressing member for fixing the pressure. The groove portion is an optical fiber housing portion for housing and fixing the optical fiber, a coating layer housing portion for housing the portion where the coating layer of the optical fiber core is formed, and an optical fiber guide portion formed therebetween. It has a first deep groove portion formed between the coating layer housing portion and the optical fiber guide portion, and a second deep groove portion formed in the middle of the coating layer housing portion. Here, since the groove depths of the first deep groove portion and the second deep groove portion are both deeper than the groove depth of the coating layer housing portion, the optical fiber fixing member of the present invention may damage the optical fiber. According to the optical connector of the present invention, the operation of connecting the optical fiber to the optical connector can be easily performed without damaging the optical fiber.

In the method of manufacturing an optical fiber fixing member according to the present invention, the groove from the coating layer housing to the optical fiber housing is formed by at least three dies. Then, the mold crack portions of the respective dies are arranged in the first deep groove portion and the second deep groove portion, respectively. Therefore, according to the method for manufacturing an optical fiber fixing member of the present invention, an optical fiber fixing member that can easily perform an optical fiber fixing operation without damaging the optical fiber can be reliably manufactured.

[Brief description of the drawings]

FIG. 1 shows a groove in an embodiment of an optical fiber fixing member of the present invention, wherein (a) is a cross-sectional view and (b) is a plan view.

FIG. 2 is a side view of a mold for forming a groove shown in FIG.

FIGS. 3A and 3B are enlarged cross-sectional views showing the vicinity of a first deep groove in the groove shown in FIG. 1, wherein FIG. 3A shows a state when an optical fiber is inserted, and FIG. .

FIG. 4 Mechanical splice (optical fiber fixing member)
FIG.

5A and 5B show the appearance of the optical connector (optical fiber fixing member), wherein FIG. 5A is a front view, FIG. 5B is a plan view, and FIG.

FIG. 6 is a sectional view taken along line AA in FIG.

7 is an optical connector (optical fiber fixing member) shown in FIG.
FIG. 3 is an exploded perspective view of FIG.

8 is an optical connector (optical fiber fixing member) shown in FIG.
FIG. 3 is a cross-sectional view when fixing an optical fiber in FIG.

9A and 9B show a groove in a conventional optical fiber fixing member, wherein FIG. 9A is a cross-sectional view and FIG. 9B is a plan view.

FIG. 10 is an enlarged cross-sectional view of a mold (portion forming an optical fiber guide) for forming a groove shown in FIG.

FIGS. 11A and 11B are enlarged cross-sectional views showing the vicinity of the optical fiber guide in the groove shown in FIG. 9; FIG. 11A shows a state when an optical fiber is inserted, and FIG. .

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 4 ... Base member, 4a ... Groove part, 4b ... Optical fiber accommodation part, 4c ... Coating layer accommodation part, 4d ... Optical fiber guide part, 4
e: first deep groove portion, 4f: second deep groove portion, 4g: insertion portion, 1
00: mechanical splice, 101: optical connector, 1
02: ferrule, 102a: optical connection surface, 103: short optical fiber, 104: base member, 104a: groove, 1
04b: optical fiber housing, 104c: coating layer housing,
104d: optical fiber guide, 105: optical fiber core, 105a: optical fiber, 105b: coating layer, 106
... Optical fiber pressing member, 107 ... Coating layer pressing member, 10
8 Clamping member, 109 Wedge insertion hole, 110 Wedge, 1
11 Knob, 112 Boots, 113 Mold, 114
... mold, 115 ... molded burr, 116 ... plug frame,
117: stop ring, 118: coil spring, X,
Y, Z: mold, α, β: mold crack.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Toshiaki Kakii 1-chome, Taya-cho, Sakae-ku, Yokohama-shi, Kanagawa F-term in Sumitomo Electric Industries, Ltd. Yokohama Works 2H036 LA03 LA08 MA01 NA01 QA16 QA18 QA22 QA31

Claims (3)

[Claims] 1. An optical fiber fixing member for fixing an end of an optical fiber core having a coating layer around an optical fiber, wherein a V-shaped cross-section for accommodating the optical fiber core with the optical fiber exposed at the end. A base member having a groove portion, and a pressing member arranged to face the groove portion and fixing the optical fiber core housed in the groove portion by being pressed against the base member; An optical fiber housing for accommodating and fixing the optical fiber exposed at the tip of the fiber core, a coating layer housing for accommodating the portion where the coating layer of the optical fiber core is formed, and formed between the two. An optical fiber guide portion, wherein the groove depth of the optical fiber housing portion is smaller than the groove depth of the coating layer housing portion, and the depth of the optical fiber guide portion is determined from the groove depth of the coating layer housing portion. Up to groove depth of optical fiber housing Wherein the groove portion is gradually changed, wherein the groove portion is a first deep groove portion which is deeper than a groove depth of the coating layer accommodation portion formed between the coating layer accommodation portion and the optical fiber guide portion, and the coating layer accommodation portion. An optical fiber fixing member, further comprising a second deep groove portion formed in the middle of the groove and deeper than the groove depth of the coating layer housing portion. 2. The optical fiber fixing member according to claim 1, a ferrule having an optical connection surface at a tip, and housed and fixed inside the ferrule, exposing the tip surface to the optical connection surface, and An optical connector comprising: a short optical fiber whose base end is housed inside an optical fiber fixing portion of the groove portion; and an elastic member for urging the ferrule toward the optical connection surface. . 3. The method for manufacturing an optical fiber fixing member according to claim 1, wherein the groove from the coating layer housing to the optical fiber housing is formed by at least three molds. A method for manufacturing an optical fiber fixing member, wherein a mold crack portion of each mold is disposed in each of the first deep groove portion and the second deep groove portion.