JP7130574B2 - Optical connector structure - Google Patents

Description

The present invention relates to an optical connector structure.

When attaching and fixing an optical member such as an optical connector to the end of an optical fiber, a liquid material such as an adhesive is interposed between them and cured. For example, Patent Document 1 discloses that the outer peripheral surface of an optical fiber is coated with a silica microporous solution, passed through an optical member, and fired to form a silica microporous layer.

JP 2007-279613 A

For example, in an optical fiber cable for laser light transmission, an optical connector is usually provided at the end of the optical fiber, and the optical fiber and the optical connector are fixed with an adhesive layer interposed therebetween. . However, when a laser beam is transmitted through an optical fiber cable, the temperature of the optical fiber rises, which causes the adhesive layer to soften.

SUMMARY OF THE INVENTION An object of the present invention is to provide an optical connector structure capable of suppressing deterioration in fixation between an optical fiber and an optical connector due to temperature rise.

The present invention provides an optical connector structure comprising an optical fiber and a tubular optical connector provided to cover an end of the optical fiber, wherein the optical fiber comprises a bare optical fiber and the bare optical fiber. The optical connector has a tubular connector main body and a tubular fiber holding sleeve fitted in the connector main body, and the end portion of the optical fiber is , the connector main body of the optical connector includes a tip side portion where the jacket is peeled off and the bare optical fiber protrudes and is exposed, and a rear portion covered with the jacket behind the tip side portion, and the tip side portion is the connector body of the optical connector. and said rear portion is provided to extend axially within said fiber retaining sleeve of said optical connector, said fiber retaining sleeve extending axially within said sleeve distal portion. and a sleeve intermediate portion provided on the rear side of the sleeve distal end portion, and a sleeve rear end portion provided on the rear side of the sleeve intermediate portion, and the optical fiber is provided in the sleeve intermediate portion. Adhesive injection portions for injecting heat dissipating adhesive communicating with the portion of the end where the rear portion is provided are perforated, and the light is provided in the front end portion of the sleeve and the rear end portion of the sleeve, respectively. A tip-side adhesive inlet hole and a rear-side adhesive inlet hole communicating with the portion of the end of the fiber where the rear portion is provided are drilled. In the portion on the rear side of the rear side adhesive inflow hole in the end side portion, an adhesive is provided between the rear portion of the end portion of the optical fiber and the fiber holding sleeve so as to fill the rear portion. and a fixing adhesive layer is provided on the sleeve, and between the front end side adhesive inlet hole in the sleeve front end side portion on the front end side of the fixing adhesive layer and the rear side adhesive inlet hole in the sleeve rear end side portion A heat dissipating adhesive layer is provided between the rear portion of the end portion of the optical fiber and the fiber holding sleeve so as to fill the rear portion .

According to the present invention, the fixing adhesive layer is provided in the optical connector so as to be interposed between the optical fiber and the optical connector, and the fixing adhesive layer is provided on the tip side of the fixing adhesive layer to connect the optical fiber and the optical connector. By providing the heat-dissipating adhesive layer so as to be interposed therebetween, it is possible to suppress deterioration in the degree of fixation between the optical fiber and the optical connector due to temperature rise.

1 is a longitudinal sectional view of an optical connector structure according to an embodiment; FIG. 1 is a perspective view of an optical fiber; FIG. FIG. 3 is a front view of a fiber retaining sleeve; Fig. 2 is a plan view of a fiber retaining sleeve; It is IV-IV sectional drawing in FIG. FIG. 2 is a cross-sectional view taken along line V-V in FIG. 1; It is the 1st figure which shows the assembly method of the optical connector structure which concerns on embodiment. It is a second diagram showing the method of assembling the optical connector structure according to the embodiment. It is a third diagram showing the method of assembling the optical connector structure according to the embodiment. It is a fourth diagram showing the method of assembling the optical connector structure according to the embodiment. It is a longitudinal cross-sectional view of the 1st modification of the optical connector structure which concerns on embodiment. FIG. 10 is a vertical cross-sectional view of a second modified example of the optical connector structure according to the embodiment;

Hereinafter, embodiments will be described in detail based on the drawings.

FIG. 1 shows an optical connector structure C according to an embodiment. The optical connector structure C according to the embodiment is provided at the end of an optical fiber cable for laser beam transmission, which is mounted on, for example, a laser processing machine.

An optical connector structure C according to the embodiment includes an optical fiber 10 and a cylindrical optical connector 20 provided to cover the end of the optical fiber 10 .

FIG. 2 shows optical fiber 10 . The optical fiber 10 has a bare optical fiber 11 and a jacket 12 covering it. The outer diameter of the optical fiber 10 is, for example, 1.3 mm.

The bare optical fiber 11 includes a relatively high refractive index core 111 and a relatively low refractive index cladding 112 covering it. The bare optical fiber 11 has, for example, a core 111 made of undoped pure silica, and a clad 112 made of silica doped with a dopant (F, B, etc.) that lowers the refractive index. The outer diameter of the bare optical fiber 11 is, for example, 500 μm. The diameter of core 111 is, for example, 100 μm. Note that the bare optical fiber 11 may be a multi-core optical fiber having a plurality of cores.

The jacket 12 may be composed of a single layer formed of a fluorine resin such as PFA, an ultraviolet curable resin, a thermosetting resin, or the like. It may be composed of two layers including an outer coating layer of resin or fluororesin. The thickness of the jacket 12 is, for example, 400 μm.

At the end of the optical fiber 10, the jacket 12 is peeled off and the bare optical fiber 11 protrudes and is exposed. A cladding mode stripper 13 is provided on the outer peripheral surface of the bare optical fiber 11 exposed at the end of the optical fiber 10 to remove the cladding mode light by radiating it to the outside.

The optical connector 20 has a connector body 21 , a fiber holding sleeve 22 , a nut member 23 and a skirt member 24 .

The connector main body 21 is composed of a tubular member made of, for example, a metal material such as aluminum or stainless steel. The connector main body 21 has a cylindrical main body front end portion 211 having a large outer diameter on the front end side, and a cylindrical main main body middle portion having a smaller outer diameter than the main main body front end side portion 211 provided continuously on the rear side. It includes a portion 212 and a main body rear side portion 213 having a cylindrical outer shape and having an outer diameter smaller than that of the main body intermediate portion 212 provided continuously on the rear side. A step for attaching the skirt member 24 is provided at the rear end portion of the main body front end portion 211 . A male screw for attaching the nut member 23 is provided on the outer peripheral surface of the main body rear side portion 213 .

In the inner hole of the connector main body 21, a cylindrical bare fiber insertion portion 214 is formed so as to extend in the axial direction toward the distal end side, and a sleeve accommodation portion 215 is formed continuously on the rear side thereof. ing. The sleeve accommodating portion 215 has a conical hole portion 215a formed so that the inner diameter gradually increases toward the rear side from the rear end of the bare fiber insertion portion 214 on the distal side, and a conical hole portion 215a continuing to the rear side. and a cylindrical hole portion 215b formed so as to extend rearward from the rear end thereof with the same inner diameter. The connector main body 21 is provided with a main body side adhesive injection portion 216 that is bored in the main body intermediate portion 212 so as to communicate with the conical hole portion 215 a of the sleeve accommodating portion 215 .

3A and B show a fiber retaining sleeve 22. FIG. The fiber holding sleeve 22 is composed of a tubular member made of, for example, a highly elastic and highly thermally conductive metal material such as oxygen-free copper, phosphor bronze, or brass. From the viewpoint of efficiently radiating the heat of the optical fiber 10, the fiber holding sleeve 22 is preferably made of oxygen-free copper. The thermal conductivity of the fiber holding sleeve 22 is preferably 80 W/m·K or more, more preferably 200 W/m·K or more, and even more preferably 300 W/m·K or more.

The fiber holding sleeve 22 is provided continuously with a cylindrical sleeve distal end portion 221 having a small outer diameter on the distal end side and the rear side thereof, and the outer diameter increases from the rear end of the sleeve distal end portion 221 toward the rear side. A sleeve first intermediate portion 222 having a conical outer shape formed to gradually expand, and a second sleeve intermediate portion having a cylindrical outer shape and having a larger outer diameter than the sleeve distal end side portion 221 continuously provided on the rear side thereof. and a cylindrical outer sleeve rear end portion 224 having an outer diameter larger than that of the sleeve distal end portion 221 and smaller than that of the second sleeve intermediate portion provided continuously on the rear side thereof. The shapes of the sleeve distal end portion 221, the sleeve first intermediate portion 222, and the second sleeve intermediate portion are the bare fiber insertion portion 214 of the connector main body 21, the conical hole portion 215a of the sleeve accommodating portion 215, and the sleeve accommodating portion, respectively. 215 corresponds to the shape of the cylindrical hole portion 215b.

Inside the fiber holding sleeve 22, a fiber is formed to extend axially from the tip of the sleeve tip side portion 221 to the tip side portion of the sleeve second intermediate portion 223 via the sleeve first intermediate portion 222. A fiber insertion hole 225 having a circular cross section is formed. The inner diameter of the fiber insertion hole 225 is slightly larger than the outer diameter of the optical fiber 10 . The sleeve second intermediate portion 223 is provided with a sleeve-side adhesive injection portion 226 that is bored so as to communicate with the fiber insertion hole 225 . The rear portion of the sleeve second intermediate portion 223 and the sleeve rear end portion 224 are axially continuous with the fiber insertion hole 225 so as to open in the same circumferential direction as the sleeve side adhesive injection portion 226 . There is provided a fiber guide groove 227 formed so as to extend to the . The cross-sectional shape of the fiber guide groove 227 may be U-shaped or the like in which the groove bottom is formed in an arc corresponding to the shape of the optical fiber 10, in addition to being U-shaped.

A pair of distal end side adhesive inflow holes 228 are bored in the distal end side portion 221 of the sleeve so as to communicate with the fiber insertion hole 225 from the outer peripheral surface thereof, and are provided facing each other via the fiber insertion hole 225 . . The tip-side adhesive inlet hole 228 is preferably formed so as to extend in a direction different from the punching direction of the sleeve-side adhesive injection portion 226 (for example, a direction shifted by 90° in the circumferential direction). A pair of rear adhesive inflow holes 229 are formed in the rear end portion 224 of the sleeve so as to communicate with the fiber guide groove 227 from the outer peripheral surface of the sleeve, and are opposed to each other via the fiber guide groove 227 . there is The rear adhesive inflow hole 229 is preferably formed so as to extend in a direction different from the drilling direction of the sleeve adhesive injection portion 226 (for example, a direction shifted by 90° in the circumferential direction). Note that the tip-side adhesive inlet hole 228 and the rear-side adhesive inlet hole 229 may be bottomed holes that open to the fiber insertion hole 225 .

With respect to the connector body 21, the fiber holding sleeve 22 has a bare fiber insertion portion 214 at the sleeve distal end side portion 221, a conical hole portion 215a of the sleeve accommodating portion 215 at the first intermediate portion 222 of the sleeve, and a second intermediate portion 223 at the sleeve. Most of the tip side is fitted in the cylindrical hole portion 215b of the sleeve accommodating portion 215, and a rear side portion of the sleeve second intermediate portion 223 and the sleeve rear end side portion 224 are provided so as to protrude rearward. , and the sleeve-side adhesive injection portion 226 is aligned so as to communicate with the main body-side adhesive injection portion 216 .

The nut member 23 is, for example, a screw member made of a metal material such as aluminum or stainless steel. The nut member 23 includes a cylindrical portion 231 on the tip side and an annular plate portion 232 integrally provided on the rear end. The inner peripheral surface of the cylindrical portion 231 is provided with a female thread into which the male thread of the body rear side portion 213 of the connector body 21 is screwed. A sleeve insertion hole 233 is formed in the center of the annular plate portion 232 and has an inner diameter intermediate between the outer diameter of the sleeve second intermediate portion 223 of the fiber holding sleeve 22 and the outer diameter of the sleeve rear end side portion 224 . .

The nut member 23 has a cylindrical portion 231 covering the body rear side portion 213 of the connector body 21 with respect to the connector body 21 and the fiber holding sleeve 22, and the female thread of the former is screwed with the male thread of the latter. The sleeve rear end side portion 224 of the fiber holding sleeve 22 is inserted through the sleeve insertion hole 233 of the plate portion 232 to protrude rearward, and the peripheral portion of the sleeve insertion hole 233 of the annular plate portion 232 is provided behind the sleeve second intermediate portion 223 . It is provided so that the ends abut.

The skirt member 24 is, for example, a cylindrical member made of a metal material such as aluminum or stainless steel. The front end of the skirt member 24 is fitted to the connector body 21 or the like on the rear end of the front end portion 211 of the connector body 21, and the skirt member 24 accommodates the rear portion of the front end portion 211 of the connector body 21. is provided in

In the optical connector structure C according to the embodiment, the end surface of the jacket 12 of the optical fiber 10 is positioned at the tip of the fiber holding sleeve 22 of the optical connector 20, and the bare optical fiber 11 on the tip side is exposed at the connector. A portion of the main body 21 extending axially through the bare fiber insertion portion 214 and covered with the jacket 12 on the rear side is provided so as to extend axially within the fiber holding sleeve 22 . The optical fiber 10 is fusion-spliced to a quartz block (not shown) provided at the tip of the optical connector 20 on the front end side, and pulled out from the rear end of the optical connector 20 on the rear side. ing.

In the optical connector structure C according to the embodiment, a fixing adhesive layer 31 is provided in the optical connector 20 so as to be interposed between the optical fiber 10 and the optical connector 20 . Specifically, the fixing adhesive layer 31 is placed in the fiber guide groove 227 of the rear end portion 224 of the fiber holding sleeve 22 protruding rearward from the nut member 23, as shown in FIG. is provided to fill the The optical connector 20 is adhesively fixed to the optical fiber 10 by this fixing adhesive layer 31 . The fixed adhesive layer 31 is preferably made of a cured liquid adhesive. Examples of the liquid adhesive that forms the fixed adhesive layer 31 include photocurable adhesives such as ultraviolet curable adhesives and acrylic adhesives, thermosetting adhesives such as epoxy adhesives and phenolic adhesives, and the like. is mentioned.

A heat-dissipating adhesive layer 41 is provided on the distal end side of the fixing adhesive layer 31 so as to be interposed between the optical fiber 10 and the fiber holding sleeve 22 of the optical connector 20 . Specifically, the heat-dissipating adhesive layer 41 allows the fiber to pass through a portion from the tip-side adhesive inlet hole 228 in the sleeve tip-side portion 221 of the fiber holding sleeve 22 to the rear-side adhesive inlet hole 229 in the sleeve rear-end portion 224 . It is provided in the hole 225 and the fiber guide groove 227 so as to bury the optical fiber 10 as shown in FIG.

According to the optical connector structure C according to the embodiment, in the optical connector 20, the heat dissipation adhesive layer 41 is provided on the distal end side of the fixing adhesive layer 31 so as to be interposed between the optical fiber 10 and the optical connector 20. With the provision of Even if the optical fiber 10 generates heat due to the cladding mode light propagating from the front end side to the rear side, the heat is efficiently radiated to the fiber holding sleeve 22 by the heat radiation adhesive layer 41, and then transferred through the connector main body 21. As a result, high heat is not transmitted to the fixing adhesive layer 31 and softening is regulated. can be suppressed.

The heat-dissipating adhesive layer 41 may be in contact with the fixed adhesive layer 31 or may be out of contact with the fixed adhesive layer 31 . is preferably in contact with the fixed adhesive layer 31 without intervening the The heat radiating adhesive layer 41 has a higher thermal conductivity than the fixed adhesive layer 31, preferably 0.20 W/m·K or more, more preferably 3 W/m·K or more. This thermal conductivity is measured according to the hot disk method. From the viewpoint of obtaining high heat dissipation, the heat dissipation adhesive layer 41 preferably has a higher refractive index than the jacket 12 of the optical fiber 10, and the refractive index is preferably 1.42 or more, more preferably 1.50 or more. be. This refractive index is measured based on an Abbe refractometer. The light transmittance of the heat dissipation adhesive layer 41 in the 1.06 μm band is preferably 70% or more, more preferably 80% or more, from the viewpoint of obtaining high heat dissipation. This light transmittance is measured based on spectral characteristics.

The heat-dissipating adhesive layer 41 is preferably made of a cured liquid adhesive. Examples of the liquid adhesive that forms the heat-dissipating adhesive layer 41 include liquid resin adhesives with high thermal conductivity, such as silicone-based adhesives and epoxy-based adhesives. The heat dissipation adhesive layer 41 may have lower adhesive performance between the optical fiber 10 and the optical connector 20 than the fixing adhesive layer 31 . From the viewpoint of obtaining high heat dissipation, it is preferable that the heat-dissipating adhesive layer 41 has a heat-conductive filler dispersed therein. Examples of thermally conductive fillers include metal oxide powders such as aluminum oxide, aluminum hydroxide, magnesium oxide, magnesium hydroxide, silicon oxide, and zinc oxide; metal powders of aluminum and copper; carbon fibers; and graphite. .

Next, a method for assembling the optical connector structure C according to the embodiment will be described.

First, the optical fiber 10 is passed through the skirt member 24, the nut member 23, the fiber holding sleeve 22, and the connector main body 21 in order. At this time, a portion of the fiber holding sleeve 22 is inserted into the connector main body 21 to temporarily attach it, and the portion of the fiber holding sleeve 22 protruding rearward from the connector main body 21 is inserted into the nut member 23 so that the cylindrical shape of the nut member 23 is inserted. It is preferable to temporarily attach the nut member 23 to the connector body 21 by covering the body rear portion 213 of the connector body 21 with the portion 231 and lightly screwing the latter male thread into the former female thread.

Next, a quartz block is fusion-spliced to the tip of the optical fiber 10 protruding from the tip of the connector main body 21, and then, as shown in FIG. .

Next, as shown in FIG. 6B, the female thread of the cylindrical portion 231 of the nut member 23 and the male thread of the main body rear side portion 213 of the connector body 21 are further tightened, so that the annular plate portion 232 of the nut member 23 is tightened. until the rear end of the sleeve second intermediate portion 223 of the fiber holding sleeve 22 is brought into contact with the peripheral edge of the sleeve insertion hole 233 of the fiber holding sleeve 22 until the main body side adhesive injection portion 216 and the sleeve side adhesive injection portion 226 are communicated with each other. The fiber holding sleeve 22 is moved distally together with the nut member 23 . At this time, the sleeve tip end portion 221 of the fiber holding sleeve 22 is fitted to the rear end portion of the bare fiber insertion portion 214 of the connector main body 21 . In addition, the first intermediate portion 222 of the sleeve having a conical outer shape is fitted into the conical hole portion 215a of the sleeve accommodating portion 215, thereby forming a wide surface contact, so that the connector main body 21 and the fiber holding sleeve 22 are in contact with each other. High heat dissipation can be obtained.

Subsequently, as shown in FIG. 6C, a liquid-state adhesive layer 31 is formed in the fiber guide groove 227 of the sleeve rear end side portion 224 of the fiber holding sleeve 22 protruding rearward from the sleeve insertion hole 233 of the nut member 23 . The fixing adhesive layer 31 is formed by injecting and curing the fixing adhesive 31'. At this time, the fixing adhesive 31 ′ flows into the rear adhesive inflow hole 229 , thereby restricting the flow of the fixing adhesive 31 ′ toward the tip side of the rear adhesive inflow hole 229 .

Then, as shown in FIG. 6D, the liquid heat radiation adhesive 41′ forming the heat radiation adhesive layer 41 is injected into the main body side adhesive injection portion 216 and the sleeve side adhesive injection portion 226, and then cured to form heat radiation bonding. A layer 41 is formed. At this time, the heat-dissipating adhesive 41' flows into the tip-side adhesive inflow hole 228, thereby restricting the flow of the heat-dissipating adhesive 41' to the tip side of the tip-side adhesive inflow hole 228, thereby dissipating heat. It is possible to prevent the adhesive 41' from flowing out of the tip of the fiber holding sleeve 22 and hardening. Further, the heat-dissipating adhesive 41' flows into the rear-side adhesive inflow hole 229, thereby restricting the flow of the heat-dissipating adhesive 41' to the rear side of the rear-side adhesive inflow hole 229. Agent 41 ′ can be prevented from contacting fixed adhesive layer 31 . Furthermore, since the front end side adhesive inlet hole 228 and the rear side adhesive inlet hole 229 are formed to extend in a direction different from the drilling direction of the sleeve side adhesive injection part 226, the heat dissipation adhesive 41' A flow path is formed along the circumferential direction of the fiber 10 so that the heat-dissipating adhesive 41 ′ can be spread over the entire circumference of the optical fiber 10 .

Finally, the front end portion of the skirt member 24 is externally fitted to the rear end portion of the main body front end portion 211 of the connector main body 21 and fixed.

In addition, as shown in FIG. 7 , a second heat-dissipating adhesive layer 42 may also be provided on the rear side of the fixing adhesive layer 31 so as to be interposed between the optical fiber 10 and the optical connector 20 . That is, the heat dissipation adhesive layer 41 may be provided on both the front end side and the rear side of the fixing adhesive layer 31 . If the second heat radiation adhesive layer 42 is provided, even if the optical fiber 10 generates heat due to the cladding mode light propagating from the rear side to the tip side, the heat is absorbed by the heat radiation adhesive layer 41 to the fiber holding sleeve. 22 can efficiently dissipate heat. In this case as well, the second heat dissipation adhesive layer 42 may be in contact with the fixed adhesive layer 31 or may be out of contact with the fixed adhesive layer 31. From the viewpoint of heat dissipation, it is preferable to contact the fixed adhesive layer 31 without interposing an air layer. Other configurations of the second heat-dissipating adhesive layer 42 are the same as those of the heat-dissipating adhesive layer 41 on the tip side of the fixed adhesive layer 31 .

As shown in FIG. 8, the fiber holding sleeve 22 is positioned between the second sleeve intermediate portion and the sleeve rear end side portion 224 so that the outer diameter gradually increases from the rear end of the second sleeve intermediate portion toward the rear side. It includes a sleeve third intermediate portion 233a having a conical outer shape formed to reduce, and the sleeve insertion hole 233 of the annular plate portion 232 of the nut member 23 is formed so that the inner diameter gradually decreases toward the rear side. Alternatively, the sleeve third intermediate portion 233 a of the fiber holding sleeve 22 may be fitted into the sleeve insertion hole 233 of the annular plate portion 232 of the nut member 23 . In this manner, the conical sleeve third intermediate portion 233a of the fiber holding sleeve 22 is fitted into the sleeve insertion hole 233 of the annular plate portion 232 of the nut member 23 to form a wide surface contact. High heat dissipation between the nut members 23 can be obtained.

INDUSTRIAL APPLICABILITY The present invention is useful in the technical field of optical connector structures.

C Optical connector structure 10 Optical fiber 20 Optical connector 31 Fixing adhesive layer 41 Heat dissipation adhesive layer

Claims (8)

An optical connector structure comprising an optical fiber and a tubular optical connector provided to cover an end of the optical fiber,
The optical fiber has a bare optical fiber and a jacket covering the bare optical fiber,
The optical connector has a connector main body that is a tubular member and a fiber holding sleeve that is a tubular member that is fitted inside the connector main body,
The end portion of the optical fiber includes a tip side portion where the jacket is peeled off and the bare optical fiber protrudes and is exposed, and a rear portion covered with the jacket behind the tip side portion, and the tip side portion is provided to extend axially within the connector body of the optical connector, and the rear portion is provided to extend axially within the fiber holding sleeve of the optical connector,
the fiber holding sleeve includes a sleeve distal end portion, a sleeve intermediate portion provided on the rear side of the sleeve distal portion, and a sleeve rear end portion provided on the rear side of the sleeve intermediate portion; An adhesive injection part for injecting a heat-dissipating adhesive communicating with a portion of the end of the optical fiber provided with the rear portion of the optical fiber is bored in the intermediate portion of the sleeve, and the tip portion of the sleeve and the a front-side adhesive inlet and a rear-side adhesive inlet are bored in the rear-end portion of the sleeve, respectively communicating with the portion of the end portion of the optical fiber where the rear-side portion is provided;
In the fiber holding sleeve of the optical connector, the rear portion of the end portion of the optical fiber and the fiber holding sleeve are provided in the rear side portion of the sleeve rear end side portion in the rear side of the rear side adhesive inlet hole. and a fixing adhesive layer is provided so as to fill the rear portion by interposing between the fixing adhesive layer and the tip side adhesive inlet of the sleeve tip side portion on the tip side of the fixing adhesive layer and the sleeve In a portion of the rear end side portion between the rear side adhesive agent inlet hole, an adhesive is inserted between the rear side portion of the end portion of the optical fiber and the fiber holding sleeve so as to fill the rear side portion. An optical connector structure in which a heat-dissipating adhesive layer is provided on the optical connector structure. In the optical connector structure according to claim 1,
The optical connector structure, wherein the heat-dissipating adhesive layer is made of a cured liquid resin adhesive. In the optical connector structure according to claim 1 or 2,
The optical connector structure, wherein the heat dissipation adhesive layer has higher thermal conductivity than the fixing adhesive layer. In the optical connector structure according to claim 1 or 2,
The optical connector structure, wherein the heat dissipation adhesive layer has a higher refractive index than the jacket of the optical fiber. In the optical connector structure according to any one of claims 1 to 4,
The optical connector structure, wherein the heat dissipating adhesive layer has thermally conductive filler dispersed therein. In the optical connector structure according to any one of claims 1 to 5,
An optical connector structure, wherein a cladding mode stripper is provided on the outer peripheral surface of the bare optical fiber at the tip side portion of the end of the optical fiber. In the optical connector structure according to any one of claims 1 to 6,
The optical connector structure according to claim 1, wherein the front-side adhesive inlet hole and/or the rear-side adhesive inlet hole are formed to extend in a direction that deviates from the perforation direction of the adhesive injection portion in the circumferential direction. In the optical connector structure according to any one of claims 1 to 7,
An optical connector structure according to claim 1, wherein said fiber holding sleeve is provided such that said sleeve front end side portion is fitted in said connector main body and said sleeve rear end side portion protrudes rearward.

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