WO2013099756A1

WO2013099756A1 - Optical-cable terminal structure and optical module

Info

Publication number: WO2013099756A1
Application number: PCT/JP2012/083081
Authority: WO
Inventors: 寿久横地; 肇荒生
Original assignee: 住友電気工業株式会社
Priority date: 2011-12-28
Filing date: 2012-12-20
Publication date: 2013-07-04

Abstract

Provided is an optical-cable (20) terminal structure for connecting the optical cable (20) to a housing (31), the optical cable having an optical fiber core (22) and an outer cover (25). The optical cable (20) is held by an optical cable holder (35) fixed to the housing (31). The optical fiber core (22) is guided into the housing (31) by way of an optical fiber guide section. The optical fiber guide section includes an inner tube (23) provided between the optical fiber core (22) and an outer cover (26), and an end of the inner tube (23) protrudes into the housing (31).

Description

Optical cable terminal structure and optical module

The present invention relates to an optical cable terminal structure and an optical module.

An optical module that photoelectrically converts an optical signal transmitted through an optical cable is known (see, for example, Patent Document 1).
In such an optical module, the end portion of the optical fiber exposed by removing the jacket of the cable is optically connected to the photoelectric conversion element in the optical module.

Japanese Unexamined Patent Publication No. 2011-112898

Incidentally, in the optical module having the connection structure between the optical cable and the housing as described above, there is a problem that the optical fiber and the tensile fiber are damaged.

For example, when the housing vibrates due to an external force, the optical fiber core wire violated inside the housing and collided with the circuit board, etc., and could be damaged.

Some optical cables are provided with a layer made of a bundle of tensile strength fibers between the jacket and the optical fiber. When the optical cable is connected to the optical module, such a tensile strength fiber may be pulled out from the end of the optical cable and fixed to the optical module housing or the like in order to increase the strength of the connection portion against the tension.
However, for example, when a bundle of tensile strength fibers pulled out from the end of the optical cable is pulled and fixed to the housing, the tensile strength fibers may be rubbed and damaged at the corners of the housing.

An object of the present invention is to provide an optical cable terminal structure and an optical module that can prevent the optical fiber core wire and the tensile fiber from being damaged.

The terminal structure of the optical cable of the present invention is:
An optical cable terminal structure for connecting an optical cable having an optical fiber core and a jacket to a housing,
The optical cable is held by an optical cable holding part fixed to the housing,
The optical fiber core wire is introduced into the housing through an optical fiber introducing portion,
The optical fiber introduction portion includes an inner tube provided between the optical fiber core wire and the outer jacket,
The end portion of the inner tube protrudes into the housing.

According to the terminal structure of the optical cable of the present invention,
The optical fiber core wire has an extra length and is introduced into the housing through an optical fiber introduction portion;
The end of the optical fiber core wire may be bonded and fixed to the inner tube.

According to the terminal structure of the optical cable of the present invention,
It is good also as a structure by which the intervening layer containing a tensile strength fiber is provided between the said inner tube and the said jacket.

According to the terminal structure of the optical cable of the present invention,
The inner tube may be configured to be bonded and fixed to the optical cable holding portion.

According to the terminal structure of the optical cable of the present invention,
The optical cable has an intervening layer containing tensile strength fibers between the optical fiber and the jacket,
At least a part of the tensile strength fiber may be bonded and fixed to the end face of the inner tube.

According to the terminal structure of the optical cable of the present invention,
The optical fiber core is inclined from the region bonded to the end portion of the inner tube toward the article to which the optical fiber core is fixed on the substrate accommodated in the housing. It is good also as a structure currently fixed to.

The optical module of the present invention is
An optical module in which a connector portion is provided at an end of an optical cable,
The optical cable includes a jacket and an optical fiber core wire that is covered with the jacket except for an end,
The connector portion includes a housing having an internal space, and an optical cable holding portion that holds the optical cable and is fixed to the housing.
The optical fiber core wire is introduced into the housing through an optical fiber introducing portion,
The optical fiber introduction portion includes an inner tube provided between the optical fiber core wire and the outer jacket,
The end portion of the inner tube protrudes into the housing.

According to the optical cable terminal structure and the optical module of the present invention, it is possible to prevent the optical fiber core wire and the tensile fiber from being damaged.

1 is a perspective view of an optical module according to a first embodiment of the present invention. It is sectional drawing of an optical cable. It is sectional drawing which shows the modification of FIG. 2A. It is a disassembled perspective view of a connector module. It is sectional drawing along the longitudinal direction of an optical module. FIG. 5 is a cross-sectional view taken along the line II shown in FIG. 4. FIG. 5B is a cross-sectional view taken along the line II of FIG. 5A showing a modified example. It is the front view which looked at the fixing member from the housing side. (A) is a top view of the connection part of an optical cable and a connector module, (B) is a side view of a circuit board. It is sectional drawing along the longitudinal direction of the optical module which concerns on 2nd embodiment of this invention. It is the figure which expanded the connection part vicinity of the optical cable and housing in sectional drawing of FIG. FIG. 10 is a sectional view taken along the line II-II shown in FIG. 9. FIG. 11B is a sectional view taken along the line II-II showing a modification of FIG. 10A. It is the front view which looked at the fixing member concerning a second embodiment from the housing side.

Hereinafter, an example of an embodiment of an optical cable terminal structure and an optical module according to the present invention will be described with reference to the drawings.

(First embodiment)
As shown in FIG. 1, the optical module 10 according to the first embodiment includes an optical cable 20 and a connector module (connector unit) 30 attached to an end of the optical cable 20. The optical module 10 can be used for transmission of signals (data) in optical communication technology and the like, and is electrically connected to an electronic device such as a connected personal computer, and converts input / output electric signals into optical signals. Transmit optical signals.

As shown in FIG. 1 and FIG. 2A, the optical cable 20 has an optical fiber ribbon 21 at the center as seen in its cross section. The optical fiber ribbon 21 is obtained by integrating a plurality (four in this example) of optical fibers 22 (optical fibers) 22 in parallel on a plane and integrating them in a tape shape with a coating resin. The optical fiber ribbon 21 is accommodated inside the inner tube 23. An intervening layer 24 is provided around the inner tube 23 along a bundle of tensile strength fibers 241 (see FIG. 6). A metal layer 25 made of a plurality of metal strands is provided on the outer periphery of the intervening layer 24. A jacket 26 made of an insulating resin is provided on the outer periphery of the metal layer 25. As shown in FIG. 2B, the intervening layer 24 may be provided inside the inner tube 23 so as to be in contact with the optical fiber ribbon 21.

As the optical fiber core 22, an optical fiber whose core and clad are quartz glass (AGF: All ある Glass Fiber), an optical fiber whose clad is made of hard plastic (HPCF: Hard Clad Fiber), and the like can be used. When a thin HPCF having a glass core diameter of 80 μm is used, it is difficult to break even if the optical fiber core wire 22 is bent to a small diameter. The plurality of optical fiber core wires 22 can be accommodated in the inner tube 23 as a single core without being taped. However, since the plurality of optical fiber cores 22 are taped, it is possible to prevent the occurrence of microbend loss due to crossing between the single optical fiber cores 22 and applying a side pressure. A plurality of optical fiber ribbons 21 may be provided.

The inner tube 23 is made of an insulating resin such as PVC (Polyvinylchloride) which is a non-halogen flame retardant resin. For example, the inner tube 23 has an outer diameter of 2.0 mm and a thickness of 0.55 mm.
The intervening layer 24 is, for example, an ultrafine-diameter aramid fiber, and is built in the optical cable 20 in a bundled state. The intervening layer 24 has a tensile strength function in the optical cable 20.

The metal layer 25 is formed by braiding a plurality of tin-plated conductive wires, for example, and has a function as a heat dissipation layer. The braid density of the metal layer 25 is 70% or more, and the knitting angle is 45 ° to 60 °. The outer diameter of the metal wire constituting the metal layer 25 is about 0.05 mm. The thermal conductivity of the metal layer 25 is 400 W / m · K, for example. The metal layer 25 is preferably arranged at a high density in order to ensure good heat conduction. For example, the metal layer 25 is preferably composed of a rectangular tin-plated lead wire.
The jacket 26 is made of an insulating resin such as polyolefin. The jacket 26 has, for example, an outer diameter of 4.2 mm and a thickness of 0.5 mm.
The optical cable 20 having such a configuration is excellent in lateral pressure characteristics of the optical fiber core wire 22 and flexibility as a cable, and is also excellent in heat dissipation.

As shown in FIG. 1, the connector module 30 includes a housing 31, an electrical connector 32 provided on the front end (left end in FIG. 1) side of the housing 31, and a circuit board 33 (see FIG. 3) accommodated in the housing 31. It has.

As shown in FIGS. 3 and 4, the housing 31 includes a metal housing 311 and a resin housing 312. A fixing member (optical cable holding portion) 35 for holding and fixing the optical cable 20 is attached to the rear end portion of the metal housing 311.

The metal housing 311 has a housing portion main body 311a having a substantially U-shaped cross section opened downward and a base plate 311b having a substantially U-shaped cross section opened upward, and has an internal space S for housing the circuit board 33 and the like. Form. An electrical connector 32 is provided on the front end side of the metal housing 311, and a fixing member 35 is attached on the rear end side of the metal housing 311. In the present embodiment, the metal housing 311 is made of a metal material having high thermal conductivity (preferably 100 W / m · K or more) such as steel (Fe-based), tin (tin-plated copper), stainless steel, copper, brass, and aluminum. It is formed and plays a role of radiating heat generated from the circuit board 33 and the like to the outside.

The resin housing 312 is made of a resin material such as polycarbonate and covers the metal housing 311.
The boot 36 is connected to the rear end portion of the resin housing 312 and covers the fixing member 35 attached to the rear end portion of the metal housing 311. The rear end portion of the boot 36 and the outer cover 26 of the optical cable 20 are bonded with an adhesive (not shown).

The fixing member 35 has a plate-like base portion 351 and a cylindrical tube portion 352. A boot 36 (see FIG. 1) is provided around the fixing member 35. The boot 36 is connected to the resin housing 312. The cylindrical portion 352 has a substantially cylindrical shape and is provided so as to protrude rearward from the base portion 351. The cylindrical portion 352 holds a part (the jacket 26 and the metal layer 25) of the optical cable 20 with the caulking ring 353 (see FIG. 4) extending rearward from both sides of the base portion 351.

As shown in FIG. 6, the intervening layer 24 of the optical cable 20, the inner tube 23, and the optical fiber ribbon 21 are inserted into the cylindrical portion 352 of the fixing member 35. Of these, the tensile strength fibers 241 of the intervening layer 24 are drawn to the housing 31 side from the opening 354 of the fixing member 35 and are drawn outward along the inner surface of the base 351 (the surface on the housing 31 side). ing. The tensile strength fiber 241 is bonded and fixed to the base portion 351 with the adhesive 50 on the inner surface of the base portion 351.

The electrical connector 32 is a component that is inserted into an external device (such as a personal computer) and electrically connects the device and the optical module 10, and extends forward from the front end (left end in FIG. 4) of the housing 31. It is provided to protrude. Moreover, the electrical connector 32 has the contact terminal 321 as shown in FIG. 4 and FIG. The contact terminal 321 is soldered to the front end side of the circuit board 33. Thereby, the electrical connector 32 is electrically connected to the circuit board 33.

The circuit board 33 is accommodated in the internal space S of the metal housing 311. As shown in FIG. 7, the control semiconductor 38 and the light receiving and emitting element 39 (optical element) are mounted on the circuit board 33. The circuit board 33 electrically connects the control semiconductor 38 and the light emitting / receiving element 39. The circuit board 33 has a substantially rectangular shape in plan view and has a predetermined thickness. The circuit substrate 33 is an insulating substrate such as a glass epoxy substrate or a ceramic substrate, and circuit wiring is formed on the surface or inside thereof by gold (Au), aluminum (Al), copper (Cu), or the like. . The control semiconductor 38 and the light emitting / receiving element 39 constitute a photoelectric conversion unit. A heat radiation sheet 43 (see FIG. 3) is disposed between the circuit board 33 and the metal housing 311.

As shown in FIG. 7, the control semiconductor 38 includes a drive IC (Integrated Circuit) 381, a CDR (Clock Data Recovery) device 382 that is a waveform shaper, and the like. The control semiconductor 38 is disposed on the front end side of the mounting surface 331 on the circuit board 33. The control semiconductor 38 is electrically connected to the electrical connector 32.

The light receiving / emitting element 39 includes a plurality (two in the present embodiment) of light emitting elements 391 (see FIG. 7) and a plurality (two in the present embodiment) of light receiving elements 392. The light emitting element 391 and the light receiving element 392 are disposed on the rear end side of the mounting surface 331 on the circuit board 33. As the light emitting element 391, for example, a light emitting diode (LED: Light Emitting Diode), a laser diode (LD: Laser Diode), a surface emitting laser (VCSEL: Vertical Cavity Surface Emitting LASER), or the like can be used. As the light receiving element 392, for example, a photodiode (PD: Photo Diode) can be used. In this example, the control semiconductor 38 and the light receiving / emitting element 39 convert an electrical signal input from an external device via the electrical connector 32 into an optical signal and input from the optical cable 20 via the light receiving / emitting element 39. It functions as a photoelectric conversion unit that converts the optical signal to be converted into an electrical signal.

The light emitting / receiving element 39 is optically connected to the optical fiber core wire 22 of the optical cable 20. Specifically, as shown in FIG. 7B, a lens array component 41 is arranged on the circuit board 33 so as to cover the light emitting / receiving element 39 and the driving IC 381. A connector part 42 is positioned and fixed to the lens array part 41. The connector part 42 is fixed with the end portions of a plurality (four in this example) of the optical fiber cores 22 separated from the optical fiber tape core 21 into a single core. More specifically, the end portion of the optical fiber core wire 22 inserted into each of a plurality of (four in this example) through holes 422 provided in the connector part 42 is the surface of the connector part 42. It is fixed by bonding at a recess 423 provided in the. Note that at least a portion of the end portion 221 of the optical fiber core wire 22 inserted into the through hole 422 of the connector component 42 has the coating resin removed to expose the optical fiber.

The heat radiation sheet 43 is disposed between the circuit board 33 and the metal housing 311 in the internal space S of the metal housing 311 as shown in FIGS. 3 to 5. The heat radiating sheet 43 plays a role of releasing heat generated from the control semiconductor 38 and the light emitting / receiving element 39 of the circuit board 33 to the metal housing 311.

The lens array component 41 has a plurality of lens surfaces 412 formed on the surface facing the connector component 42 and on the surfaces facing the light emitting element 391 and the light receiving element 392. In addition, a reflection surface 411 is formed in the center of the upper surface of the lens array component 41 along the width direction. The light emitted from the light emitting element 391 enters the lens array component 41 through the lens surface 412 formed on the opposing surface. The light incident on the lens array component 41 is reflected by the reflecting surface 411, and then the corresponding optical fiber core fixed to the connector component 42 by the lens surface 412 formed on the surface facing the connector component 42. Optically coupled to the end face of line 22.

On the other hand, the light emitted from the end face of the optical fiber core wire 22 enters the lens array component 41 through the corresponding lens surface 412. The light incident on the lens array component 41 is reflected by the reflecting surface 411 and then received by the light receiving element 392 through the lens surface 412 formed on the surface facing the light receiving element 392. That is, the plurality of optical fiber core wires 22 fixed to the connector part 42 and the light emitting / receiving element 39 are optically connected via the lens array part 41. The plurality of lens surfaces 412 formed on each surface of the lens array component 41 are, for example, collimating lenses that emit incident diffused light as parallel light and collect and emit incident parallel light. . Such a lens array component 41 is integrally molded by, for example, resin injection molding.

In this example, the inner tube 23 protrudes further toward the housing 31 than the inner surface of the base 351 of the fixing member 35. The adhesive 50 is also applied to the end surface 231 and the outer peripheral surface 232 of the inner tube 23 together with the inner surface of the base portion 351. Since the tensile strength fiber 241 is bonded not only to the inner surface of the base portion 351 but also to the end surface 231 and the outer peripheral surface 232 of the inner tube 23, the area of the adhesion surface of the tensile strength fiber 241 is increased, and the tensile strength fiber 241 is made stronger. Can be glued.

When the tensile strength fiber 241 (intervening layer 24) is provided inside the inner tube 23 as shown in FIG. 2B, the tensile strength fiber 241 includes the end surface 231 and the outer peripheral surface 232 of the inner tube 23 as shown in FIG. 5B. The bonding area to the inner surface increases, and the bonding area to the inner surface of the base 351 decreases. Thereby, since the tensile strength fiber 241 is bonded to the resin inner tube 23, even if the tensile strength fiber 241 is impacted by the optical cable 20 being pulled or the like, and the tensile strength fiber 241 is rubbed with the inner tube 23, The tensile strength fiber 241 is less likely to be damaged.

The procedure for holding the optical cable 20 using the fixing member 35 is, for example, as follows. That is, first, the outer cover 26 is peeled off from the end face of the optical cable 20 to a certain length to expose the inner metal layer 25, and then the intervening layer 24, the inner tube 23, and the optical fiber ribbon 21 of the optical cable 20 are placed in the cylinder. The outer cover 26 and the metal layer 25 are disposed along the outer peripheral surface of the cylindrical portion 352 while being inserted into the portion 352. At this time, the inner tube 23 is further protruded toward the housing 31 than the inner surface of the base 351 of the fixing member 35, and the tensile fiber 241 of the intervening layer 24 is drawn out from the opening 354 of the fixing member 35 to the housing 31 side. . Further, as shown in FIG. 4, the extra length portion of the metal layer 25 extending from the end surface of the outer cover 26 is folded back at the end surface of the outer cover 26 so as to be along the outer surface of the outer cover 26.

Next, caulking rings 353 extending from both sides of the base portion 351 are caulked so as to be pressed against the cylindrical portion 352 side. As a result, as shown in FIG. 4, the jacket 26 and the metal layer 25 are sandwiched between the cylindrical portion 352 and the caulking ring 353, and as a result, the optical cable 20 is held and fixed by the fixing member 35.

Note that the end of the metal layer 25 may be soldered to one surface (rear surface) of the base 351. Thereby, the fixing member 35 and the metal layer 25 are thermally connected. In this example, a fixing member 35 is coupled to the rear end portion of the metal housing 311. Therefore, the metal housing 311 and the fixing member 35 are physically and thermally connected. The metal layer 25 of the optical cable 20 is also thermally connected to the metal housing 311 via the fixing member 35.
Next, the tensile strength fiber 241 of the intervening layer 24 drawn out from the opening 354 of the fixing member 35 to the housing 31 side is drawn outward along the inner surface of the base portion 351 (surface on the housing 31 side), and on the inner surface of the base portion 351. The base 351 and the adhesive 50 are used for adhesive fixing. At this time, the adhesive 50 is applied and adhered to the end surface 231 and the outer peripheral surface 232 of the inner tube 23 together with the inner surface of the base portion 351. In this way, the optical cable 20 is held using the fixing member 35.

As described above, according to the terminal structure of the optical cable 20 according to the first embodiment, the optical fiber core wire 22, the outer sheath 26, and the tensile fiber provided between the optical fiber core wire 22 and the outer sheath 26. The optical cable 20 having the intervening layer 24 composed of 241 is connected to the housing 31 of the connector module 30. At this time, the end portion of the inner tube 23 provided between the intervening layer 24 and the jacket 26 protrudes to the inside of the housing 31. Therefore, it is possible to prevent the optical fiber core wire 22 from being rubbed and damaged by the fixing member 35 or the housing 31 due to deformation or vibration of the terminal portion of the optical cable 20.

Further, since at least a part of the tensile strength fiber 241 is fixed to the fixing member 35 that holds the optical cable 20 by being fixed to the housing 31, the tensile strength fiber 241 is fixed to the fixing member 35 due to deformation or vibration of the end portion of the optical cable 20. It is possible to prevent damage by rubbing with the housing 31 or the like.

In addition, since at least a part of the tensile strength fiber 241 is bonded and fixed to the end surface 231 of the inner tube 23, both the fixing member 35 and the end surface 231 of the inner tube 23 are used as the bonding surface of the tensile strength fiber 241. Thereby, the adhesive force of the tensile strength fiber 241 to the fixing member 35 is improved.

Further, since the end portion of the inner tube 23 protrudes to the inside of the housing 31 from the portion where the tensile strength fiber 241 of the fixing member 35 is bonded and fixed, in addition to the fixing member 35 and the end surface 231 of the inner tube 23, The outer peripheral surface 232 at the end of the inner tube 23 can be used as an adhesive surface of the tensile strength fiber 241. Thereby, the adhesive force of the tensile strength fiber 241 to the fixing member 35 is further improved.

Furthermore, in the optical module 10 according to the embodiment of the present invention, the intervening layer 24 including the optical fiber core wire 22, the jacket 26, and the tensile fiber 241 provided between the optical fiber core wire 22 and the jacket 26 is provided. The optical cable 20 is connected to the housing 31 of the connector module 30. At this time, the end portion of the inner tube 23 provided between the intervening layer 24 and the jacket 26 protrudes to the inside of the housing 31. Therefore, it is possible to prevent the optical fiber core wire 22 from being rubbed and damaged by the fixing member 35 or the housing 31 due to deformation or vibration of the terminal portion of the optical cable 20.

(Second embodiment)
Next, a second embodiment will be described. As in the first embodiment, the fixing member 35 that is an optical cable holding portion holds the end portion of the optical cable 20, and the intervening layer 24, the inner tube 23, and the optical fiber core wire 22 are arranged on the inner side of the cylindrical portion 352. (See FIGS. 4 to 7). The inner tube 23 disposed outside the optical fiber core 22 protrudes further from the inner surface of the base 351 of the fixing member 35 to the connector module 30 side, that is, to the internal space S of the housing 31. The fixing member 35 and the inner tube 23 are an example of an optical fiber introducing portion in the present invention, and the optical fiber tape core wire 21 including a plurality of optical fiber core wires 22 passes through the fixing member 35 and the inner tube 23 and is a housing. It is introduced into the internal space S of 31.

At the end of the optical fiber ribbon 21 introduced into the internal space S of the housing 31, the coating resin is removed and the four optical fibers 22 are separated into a single core. The end portions 221 of the four optical fiber core wires 22 are inserted into the through holes 422 of the connector part 42 and are bonded and fixed to the recesses 423 provided on the surface of the connector part 42.

In the second embodiment, as shown in FIGS. 8 to 11, the adhesive 51 is not only the inner surface 233 of the inner tube 23 and the outer peripheral surface of the optical fiber core wire 22 but also the end surface 231 and the outer peripheral surface of the inner tube 23. 232, and also applied to the surface of the base portion 351 of the fixing member 35 (the surface on the housing 31 side). For example, an epoxy adhesive is preferably used as the adhesive 51.

Further, in the present embodiment, as shown in FIGS. 8 and 9, the concave portion 423 of the connector part 42 on which the optical fiber core wire 22 is placed, the fixing member 35 that is the optical fiber introduction portion, and the inner tube 23 include: The optical cable 20 is arranged so as to be shifted in the height direction of the terminal structure. The optical fiber core wire 22 (end portion 221) in the internal space S of the housing 31 has an extra length from the end portion of the inner tube 23 to the portion fixed to the connector part 42. However, as shown in FIGS. 8 to 11, the optical fiber core wire 22 is firmly bonded and fixed to the inner tube 23 by the adhesive 51.

As described above, according to the terminal structure of the optical cable 20 according to the second embodiment, for example, even when the housing 31 vibrates due to an external force, the extra length portion of the optical fiber core wire 22 in the housing 31 is unlikely to vibrate. Therefore, the extra length portion of the optical fiber core wire 22 can be prevented from colliding with the circuit board 33 and being damaged.

Further, in this embodiment, the end portion of the inner tube 23 protrudes further into the housing 31 than the inner surface of the base portion 351 of the fixing member 35. As shown in FIGS. 8 and 9, the adhesive 51 is introduced into a gap between the end of the inner tube 23 protruding into the housing 31 and the optical fiber core wire 22. The inner surface 233 (see FIG. 11) and the outer peripheral surface of the optical fiber core wire 22 are bonded and fixed. Therefore, the extra length portion of the optical fiber core wire 22 is less likely to vibrate within the housing 31.

In the present embodiment, as shown in FIGS. 8 to 11, the adhesive 51 includes the inner surface 233 of the inner tube 23 and the outer peripheral surface of the optical fiber core wire 22, the end surface 231 and the outer peripheral surface 232 of the inner tube 23, and It is integrally applied to the surface of the base portion 351 of the fixing member 35 (the surface on the housing 31 side). Therefore, the inner tube 23 is bonded and fixed to the fixing member 35. Thereby, the extra length portion of the optical fiber core wire 22 bonded and fixed to the inner tube 23 is configured to be less susceptible to vibration in the housing 31.

Further, in the present embodiment, the cushioning action of the tensile strength fiber 241 constituting the intervening layer 24 provided between the inner tube 23 and the outer sheath 26 causes the optical fiber 22 to vibrate with the vibration of the housing 31. Even if it is, the vibration can be absorbed.

Further, the optical fiber core wire 22 is fixed so as to be inclined from the region bonded to the end portion of the inner tube 23 toward the connector part 42 on which the optical fiber core wire 22 is placed. Is preferred. In this way, the connector part 42 on which the optical fiber core wire 22 is placed, the fixing member 35 that is the optical fiber introduction portion, and the inner tube 23 are shifted in the height direction of the terminal structure of the optical cable 20. Even in this case, the bending radius of the optical fiber core 22 can be increased, and the transmission loss of the optical fiber core 22 can be reduced.

When the tensile strength fiber 241 (intervening layer 24) is provided inside the inner tube 23 as shown in FIG. 2B, the tensile strength fiber 241 includes the end surface 231 and the outer peripheral surface 232 of the inner tube 23 as shown in FIG. 10B. The bonding area to the inner surface increases, and the bonding area to the inner surface of the base 351 decreases. Thereby, since the tensile strength fiber 241 is bonded to the resin inner tube 23, even if the tensile strength fiber 241 is impacted by the optical cable 20 being pulled or the like, and the tensile strength fiber 241 is rubbed with the inner tube 23, The tensile strength fiber 241 is less likely to be damaged.

The optical cable terminal structure and the optical module according to the present invention are not limited to the above-described embodiments, and appropriate modifications and improvements can be made. For example, in the optical module 10 according to the above embodiment, the inner tube 23 is provided on the outer periphery of the optical fiber ribbon 21 in the optical cable 20. However, an optical cable without an inner tube can be used for the optical module 10. In this case, the optical fiber core wire 22 may be directly bonded to the fixing member 35 by the

adhesives

50 and 51.

The optical cable terminal structure and the optical module of the present invention are not limited to the above-described embodiments, and appropriate modifications and improvements can be made. For example, in the above embodiment, the optical fiber core wire 22 and the light emitting / receiving element 39 are optically coupled using the lens array component 41, but the lens array component 41 may not be used. For example, the optical fiber core 22 and the light emitting / receiving element 39 may be optically coupled by bonding the optical fiber core 22 to the light receiving / emitting element 39 without using the lens array component 41. Moreover, in the said embodiment, although the optical fiber core wire 22 and the light emitting / receiving element 39 are optically coupled using the connector component 42, the connector component 42 does not need to be used. For example, the optical fiber core 22 may be held by bonding the optical fiber core 22 to the lens array component 41 without using the connector part 42.

This application is based on Japanese patent applications (Japanese Patent Application Nos. 2011-287083 and 2011-287085) filed on Dec. 28, 2011, the contents of which are incorporated herein by reference.

Claims

An optical cable terminal structure for connecting an optical cable having an optical fiber core and a jacket to a housing,
The optical cable is held by an optical cable holding part fixed to the housing,
The optical fiber core wire is introduced into the housing through an optical fiber introducing portion,
The optical fiber introduction portion includes an inner tube provided between the optical fiber core wire and the outer jacket,
An end structure of an optical cable, wherein an end portion of the inner tube protrudes into the housing.
The optical fiber core wire has an extra length and is introduced into the housing through an optical fiber introduction portion;
The terminal structure of the optical cable according to claim 1, wherein an end portion of the optical fiber core wire is bonded and fixed to the inner tube.
3. The optical cable terminal structure according to claim 2, wherein an intervening layer including a tensile strength fiber is provided between the inner tube and the jacket.
The optical cable terminal structure according to any one of claims 1 to 3, wherein the inner tube is bonded and fixed to the optical cable holding portion.
The optical cable has an intervening layer including a tensile fiber between the optical fiber core and the outer jacket,
The terminal structure of an optical cable according to claim 1, wherein at least a part of the tensile strength fiber is bonded and fixed to an end face of the inner tube.
The optical fiber core is inclined from the region bonded to the end portion of the inner tube toward the article to which the optical fiber core is fixed on the substrate accommodated in the housing. The terminal structure of an optical cable according to claim 5, wherein the terminal structure is fixed to the optical cable.
An optical module in which a connector portion is provided at an end of an optical cable,
The optical cable includes a jacket and an optical fiber core wire that is covered with the jacket except for an end,
The connector portion includes a housing having an internal space, and an optical cable holding portion that holds the optical cable and is fixed to the housing.
The optical fiber core wire is introduced into the housing through an optical fiber introducing portion,
The optical fiber introduction portion includes an inner tube provided between the optical fiber core wire and the outer jacket,
An end of the inner tube protrudes into the housing.