JPH11149018A - Receptacle type surface-mount opto-coupler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a receptacle type surface-mount opto-coupler which is simplified in the structure and precisely coupled to an outside optical connector. SOLUTION: A receptacle type surface-mount opto-coupler transmitting an optical signal comprises an optical fiber 13 in the surface-mount opto-couper receptacle part, and also comprises a resin molded case 16 in which a guide hole 16a is formed and an opto-coupler plug 17 capable of being easily aligned and matched with the optical fiber 13 inside the guide hole 16a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of an optical coupler used for optical communication.

[0002]

2. Description of the Related Art As a signal light source used in optical communication, an optical coupler equipped with a semiconductor laser (hereinafter, referred to as LD) is generally used. Since an optical fiber is usually used as a transmission medium, the output of the optical coupler is performed via the optical fiber, and an optical connector having an alignment function is used for connection with the transmission medium.

A conventional receptacle type surface mount optical coupler will be described below with reference to FIG. FIG. 3 is a configuration diagram of such a conventional receptacle type surface mount optical coupler. In the figure, 1 is an LD, 2 is a photodiode (PD) for monitoring the output of LD1, and 3 is an optical fiber for transmitting the optical output from LD1. It has been processed. Reference numeral 4 denotes a Si substrate having an index marker for mounting the LD 1 with high precision, and having a V-groove formed by anisotropic etching with the index marker and sub-μm accuracy.

The LD 1 is mounted on the Si substrate 4 with an index marker of the Si substrate 4 and a marker formed on the LD 1 with a sub-μm accuracy using an infrared transmissive die bonder or the like. Is fixed with solder or the like. The optical fiber 3 is regulated and positioned by being fixed to the V groove of the Si substrate 4 with an adhesive or the like. The optical coupling portion between the LD1, PD2 and optical fiber 3 is potted and sealed with a transparent resin or the like.

[0005] Further, reference numeral 5 indicates that the optical fiber 3 is bonded and fixed inside, and the outside is fixed to the Si substrate 4 with an adhesive or the like.
Ferrule whose end face is mirror-finished together with the optical fiber 3,
Reference numeral 6 denotes a lead frame for mounting the Si substrate 4 on which each component is mounted, wiring by wire bonding or the like, and taking out an electrode to the outside, and 7 denotes a groove 7a for locking an external connector.
Is a resin-molded housing integrally formed.

Reference numeral 8 denotes a split sleeve, and 9 denotes an external optical connector plug. The ferrule 5 and the optical connector plug 9 are aligned and connected by the split sleeve 8.
The optical signal of the LD 1 is transmitted to the outside.
Further, as a signal light source used for optical communication,
An optical coupler equipped with a semiconductor laser (hereinafter, referred to as an LD) is used. Particularly, in the case of long-distance digital transmission or analog transmission, the DFB-LD has a single oscillation wavelength.
Is used. When this DFB-LD is used, since the reflected return light from the outside causes fluctuation of single oscillation, an optical isolator for cutting the return light is usually mounted in front of the LD element.

[0007]

However, in the structure of the conventional receptacle type surface mount optical coupler described above,
Inevitably, expensive components such as ferrules and split sleeves are required for centering coupling with an external optical fiber, and it has been difficult to reduce the cost. Further, since an optical fiber is usually used as the transmission medium, the output of the optical coupler is performed via the optical fiber, and an optical connector having an alignment function is used for connection with the transmission medium. However, in the case of a surface mount optical coupler, an optical isolator could not be mounted due to its configuration.

Usually, an optical isolator is used by inserting it into a space between an LD and an optical fiber. In the case of an optical coupler using a Si substrate as in the conventional example, the coupling between the LD and the optical fiber is directly. Because of the bonding, the gap is several μm to 10 μm.
There is a problem that the optical isolator cannot be inserted because it is only about 0 μm. SUMMARY OF THE INVENTION An object of the present invention is to provide a receptacle type surface mount optical coupler which eliminates the above problems, has a simplified structure, and can be accurately coupled to an external optical connector plug.

[0009]

According to the present invention, there is provided a receptacle type surface mount optical coupler for transmitting an optical signal, wherein an optical fiber is provided inside a surface mount optical coupler receptacle. Having, and a resin mold housing in which a guide hole is formed, externally mounted in the guide hole,
An optical connector plug that can be aligned with the optical fiber inside the guide hole is provided.

Therefore, the structure is simplified, and the optical connector plug attached from the outside can be accurately coupled to the optical fiber. That is, by forming the guide hole integrally with the optical fiber, expensive ferrules and split sleeves conventionally required can be eliminated. [2] The receptacle type surface mount optical coupler according to [1], wherein the guide hole has a tapered surface in which a space is formed outside the optical fiber as a center.

As described above, since the guide hole has a tapered surface in which a space is formed outwardly from the optical fiber as a center, the mounting of the optical connector plug into the guide hole becomes smooth, and the optical fibers are connected to each other. Can be performed accurately. [3] In the receptacle type surface mount optical coupler according to the above [1] or [2], a locking groove is formed in the resin mold housing, and the engagement for fixing the optical connector plug in the locking groove. The nail is locked.

Therefore, the locking groove can also be formed integrally with the resin mold housing, and the locking claw for fixing the optical connector plug can be locked in this locking groove.
The structure is simplified, and accurate alignment of the internal optical fiber and the optical connector plug is possible. [4] In a receptacle-type surface-mount optical coupler for transmitting an optical signal, a ferrule-shaped cylindrical portion capable of aligning an external optical connector plug with an internal optical fiber in a surface-mount optical coupler receptacle portion is formed by resin molding. This is formed integrally with the mold housing.

Therefore, when the resin molded casing is formed by transfer molding or the like, by simultaneously forming the high-precision ferrule-shaped cylindrical portion integrally with the optical fiber,
Expensive ferrules can be reduced. [5] In the receptacle type surface mount optical coupler according to the above [4], a locking groove is formed in the resin mold housing, and an engaging claw for fixing the optical connector plug is locked in the locking groove. It is made to be done.

Therefore, the locking groove can also be formed integrally with the resin mold housing, and the locking claw for fixing the optical connector plug can be locked in this locking groove.
The structure is simplified, and accurate alignment of the internal optical fiber and the optical connector plug is possible. [6] In a receptacle type surface mount optical coupler for transmitting an optical signal, an optical isolator having a receptacle and a connector function is provided in a surface mount optical coupler receptacle portion, and an optical connector plug capable of aligning with the optical isolator is provided. It was made.

Therefore, by connecting an optical isolator having a receptacle and a connector function to the optical coupler receptacle, it becomes possible to give the surface-mounted optical coupler an isolator function. [7] In the receptacle type surface mount optical coupler according to [6], a locking groove is formed in a housing of the optical isolator, and an engaging claw for fixing the optical connector plug is engaged with the locking groove. It is intended to be stopped.

Therefore, the locking groove can be formed integrally with the housing of the optical isolator, and the locking claw for fixing the optical connector plug can be locked in this locking groove, so that the structure is improved. The simplification and accurate alignment of the internal optical fiber and the optical connector plug are possible.

[0017]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a configuration diagram of a receptacle type surface mount optical coupler showing a first embodiment of the present invention, and FIG. 2 is a cross-sectional view showing a structure of a connection portion between the optical module and an optical connector. In FIG. 1, 11 is an LD, 12
Is a photodiode (P) for monitoring the output of LD11.
D) and 13 are optical fibers for transmitting the optical output from the LD 11, and the end face on the LD 11 side is machined into a spherical, oblique, or flat mirror face, and the opposite end is machined into a flat mirror face, spherical face, or the like. Reference numeral 14 denotes a Si substrate having an index marker for mounting the LD 11 with high precision, and having a V-groove formed by anisotropic etching with the index marker and sub-μm accuracy.

The LD 11 is mounted on the Si substrate 14 with an index marker of the Si substrate 14 and a marker formed on the LD 11 with sub-μm accuracy using an infrared transmissive die bonder or the like. It is fixed with solder or the like. The optical fiber 13 is a Si substrate 1
By being fixed to the V groove of No. 4 with an adhesive or the like, it is regulated and positioned. The optical coupling portion of the LD 11, PD 12, and optical fiber 13 is potted and sealed with a transparent resin or the like.

Further, reference numeral 15 denotes a Si substrate 1 on which each component is mounted.
4, a lead frame for wiring by wire bonding or the like and taking out electrodes to the outside, and 16 is a guide hole 16a for guiding a ferrule portion of the connector from the outside.
And a resin molded housing integrally formed with a locking groove 16b for locking an engagement claw for fixing an optical connector plug described later. Reference numeral 17 denotes an optical connector plug that is externally mounted in the guide hole 16a.
The engaging claw 18 is provided.

Here, the guide hole 16a will be described with reference to FIG. As shown in FIG.
Optical fiber 13, Si substrate 14, lead frame 1
5 are integrated by transfer molding of a thermosetting resin. At this time, the optical fiber 13 can be centered by the tapered guide portion (concave tapered surface) 21 a of the insert 21, and the optical connector plug 17 ( By using the molding die insert 21 having a diameter slightly larger than the outer shape of the optical fiber 13 and the guide hole 16a with high accuracy.
Can be formed.

Here, a concave tapered surface 21a whose central portion is depressed is formed at the end surface of the insert 21, and a space is formed outside the optical fiber 13 at the bottom of the guide hole 16a. A conical (convex) tapered surface 16c is formed. Optical connector plug 1 thus formed
The guide hole 7 can be aligned with the internal optical fiber 13 by using the guide hole 16a without using a split sleeve or a ferrule, and can accurately transmit the optical signal of the LD 11 to the outside.

Since the guide hole 16a has the conical (convex) tapered surface 16c in which a space is formed outside the optical fiber 13 as a center, the optical connector plug to the guide hole 16a is formed. 17 can be mounted smoothly, and the optical fibers 13 can be accurately coupled to each other. Further, the locking groove 16b can also be formed integrally with the resin mold housing 16, and the locking claw 18 for fixing the optical connector plug 17 can be locked in the locking groove 16b, thus providing a structure. Is simplified, and accurate alignment and alignment between the internal optical fiber 13 and the optical connector plug 17 are possible.

Next, a second embodiment of the present invention will be described. FIG. 4 is a configuration diagram of a receptacle type surface mount optical coupler showing a second embodiment of the present invention, and FIG. 5 is a cross-sectional view showing a structure of a connection portion between the optical module and an optical connector. FIG.
Reference numeral 31 denotes an LD; 32, a photodiode (PD) for monitoring the output of the LD 31; 33, an optical fiber for transmitting the optical output from the LD 31;
It is machined into a mirror surface oblique, mirror surface flat or the like, and the opposite end is machined into a mirror surface flat or spherical surface. Reference numeral 34 denotes an Si substrate having an index marker for mounting the LD 31 with high precision, and having a V groove formed by anisotropic etching with the index marker and sub-μm accuracy.

The LD 31 has an index marker on the Si substrate 34 and a marker formed on the LD 31 mounted on the Si substrate 34 with an accuracy of sub-μm using an infrared transmissive die bonder or the like. It is fixed with solder or the like. The optical fiber 33 is a Si substrate 3
By being fixed to the V groove of No. 4 with an adhesive or the like, it is regulated and positioned. The optical coupling portion of the LD 31, PD 32 and optical fiber 33 is potted and sealed with a transparent resin or the like.

Further, 35 is a Si substrate 3 on which each component is mounted.
4, a lead frame for wiring by wire bonding or the like and taking out the electrodes to the outside, and 36 is a resin molded case formed by transfer molding or the like. A ferrule-shaped cylindrical portion 36a as shown in the outside of the detailed sectional view of FIG.

The output end of the optical fiber 33 to the outside is processed before molding or the back end of the mold is polished. The ferrule-shaped cylindrical portion 36a of the resin mold housing 36 also has a locking groove 36b for locking an external optical connector plug. 37 is a split sleeve for aligning the optical connector plug from the outside with the optical fiber 33 held in the ferrule-shaped cylindrical portion 36a, 38 is an external optical connector plug, and 39 is formed on the optical connector plug 38. The engaging claw is locked by the locking groove 36b and coupled to the optical module.

As described above, according to the second embodiment, when forming the resin mold housing by transfer molding or the like,
At the same time, by forming the high-precision ferrule-shaped cylindrical portion 36a integrally with the optical fiber 33, expensive ferrules can be reduced. Next, a third embodiment of the present invention will be described. FIG. 6 is a configuration diagram of a receptacle type surface mount optical coupler showing an embodiment of the present invention, and FIG. 7 is a cross-sectional view showing a structure of a connection portion between the optical module and an optical connector.

In FIG. 6, reference numeral 41 denotes an LD, 42 denotes a photodiode (PD) for monitoring the output of the LD 41, and 43 denotes an LD.
And an optical fiber for transmitting the optical output from the LD 41.
The one side end surface is machined into a spherical end, a mirror surface oblique, a mirror surface flat, or the like. Reference numeral 44 denotes a Si substrate having an index marker for mounting the LD 41 with high precision, and having a V-groove formed by anisotropic etching with the index marker and sub-μm accuracy.

The LD 41 has an index marker on the Si substrate 44 and a marker formed on the LD 41 mounted on the Si substrate 44 with sub-μm accuracy using an infrared transmission die bonder or the like. It is fixed with solder or the like. The optical fiber 43 is a Si substrate 4
By being fixed to the V groove of No. 4 with an adhesive or the like, it is regulated and positioned. The optical coupling portion of the LD 41, PD 42, and optical fiber 43 is potted and sealed with a transparent resin or the like.

Reference numeral 45 denotes a ferrule in which the optical fiber 43 is adhered and fixed inside, and the outside is fixed to the Si substrate 44 with an adhesive or the like, and the end surface is mirror-finished together with the optical fiber 43; Equipped with 44,
A lead frame for wiring by wire bonding or the like and taking out the electrodes to the outside, and a resin mold housing 47 integrally formed with a locking groove 47a for fixing a connector from the outside. 48 is a split sleeve, 49 is an optical connector plug from outside, and 50 is an optical isolator assembly having a receptacle function.

The receptacle type optical isolator will be described with reference to the longitudinal sectional view of FIG. Reference numeral 51 denotes an optical fiber connected to the optical fiber 43 of the optical coupler. The opposite end of the optical fiber is processed with a spherical lens to convert the light from the optical coupler into a parallel beam. Reference numeral 52 denotes a ferrule for holding the optical fiber 51 and connecting to the ferrule 45 holding the optical fiber by the split sleeve 48; 53, an optical isolator; and 54, a sleeve for adjusting and fixing the ferrule 52 to the isolator.

Reference numeral 55 denotes an optical fiber for converging and propagating a parallel beam from the optical fiber 51 that has passed through the optical isolator 53 to connect to an external optical connector plug 49;
Reference numeral 56 denotes a ferrule for connecting to the external optical connector plug 49 with the same function as the ferrule 52, reference numeral 57 denotes a sleeve for adjusting a parallel beam from the optical fiber 51, and reference numeral 58 denotes a ferrule 45 to the ferrule 45 of the optical coupler.
A spring for applying a pressing force when inserting the optical module, 60 is a housing for integrating the above members, has an engaging claw 59 connected to the locking groove 47a, and locks the optical module. It has a function to do.

The external optical connector plug 49 is aligned with the ferrule 56 by the split sleeve 70, and the optical signal of the LD 41 is transmitted to the outside. Further, the external optical connector plug 49 has an engagement claw 62 and is configured to be connected to the locking groove 61 of the housing 60 of the optical isolator assembly 50. As described above, according to the third embodiment, the surface mount optical coupler can be provided with the isolator function by connecting the optical isolator having the receptacle and the connector function to the optical coupler receptacle.

It should be noted that the present invention is not limited to the above embodiment, but various modifications are possible based on the spirit of the present invention, and these are not excluded from the scope of the present invention.

[0035]

As described above, according to the present invention, the following effects can be obtained. (1) According to the first aspect of the present invention, the structure is simplified, and the optical connector plug can be accurately connected to an external optical connector plug. That is, by forming the guide hole integrally with the optical fiber, it is possible to reduce expensive ferrules and split sleeves which are conventionally required.

(2) According to the second aspect of the present invention, since the guide hole has a tapered surface in which a space is formed outwardly from the optical fiber as a center, the optical connector plug is mounted in the guide hole. And the optical fibers can be accurately coupled. (3) According to the third aspect of the invention, the locking groove can also be formed integrally with the resin mold housing, and the locking claw for fixing the optical connector plug is locked in this locking groove. Accordingly, the structure is simplified, and accurate alignment of the internal optical fiber and the optical connector plug is possible.

(4) According to the fourth aspect of the present invention, when forming the resin-molded casing by transfer molding or the like, the high-precision ferrule-shaped cylindrical portion is formed integrally with the optical fiber at the same time, so that an expensive ferrule is formed. Can be reduced. (5) According to the fifth aspect of the invention, the locking groove can also be formed integrally with the resin mold housing, and the locking claw for fixing the optical connector plug is locked in this locking groove. Accordingly, the structure is simplified, and accurate alignment of the internal optical fiber and the optical connector plug is possible.

(6) According to the invention described in claim 6, by connecting the optical isolator having the receptacle and the connector function to the optical coupler receptacle, it is possible to make the surface mount optical coupler have the isolator function. Becomes (7) According to the invention of claim 7, the locking groove can be formed integrally with the housing of the optical isolator, and the locking claw for fixing the optical connector plug is locked in this locking groove. Therefore, the structure can be simplified, and accurate alignment of the internal optical fiber and the optical connector plug can be achieved.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a receptacle type surface mount optical coupler showing a first embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a structure of a connecting portion between the optical module and the optical connector of the receptacle type surface mount optical coupler according to the first embodiment of the present invention.

FIG. 3 is a configuration diagram of a conventional receptacle type surface mount optical coupler.

FIG. 4 is a configuration diagram of a receptacle type surface mount optical coupler showing a second embodiment of the present invention.

FIG. 5 is a cross-sectional view showing a structure of a connecting portion between an optical module and an optical connector of a receptacle type surface mount optical coupler according to a second embodiment of the present invention.

FIG. 6 is a configuration diagram of a receptacle type surface mount optical coupler showing a third embodiment of the present invention.

FIG. 7 is a sectional view showing a structure of a connection portion between an optical module and an optical connector of a receptacle type surface mount optical coupler according to a third embodiment of the present invention.

[Explanation of symbols]

 11, 31, 41 LD 12, 32, 42 Photodiode (PD) 13, 33, 43, 51, 55 Optical fiber 14, 34, 44 Si substrate 15, 35, 46 Lead frame 16, 36, 47 Resin molded housing 16a Guide holes 16b, 36b, 47a, 61 Locking groove 16c Conical (convex) tapered surface 17, 38, 49 Optical connector plug 18, 39, 59, 62 Engaging claw 21 Insert 21a Tapered guide portion (concave tapered surface) ) 36a Ferrule-shaped cylindrical portion 37, 48, 70 Split sleeve 45, 52, 56 Ferrule 50 Optical isolator assembly 53 Optical isolator 54, 57 Sleeve 58 Spring 60 Housing

Claims (7)

[Claims] 1. A receptacle type surface mount optical coupler for transmitting an optical signal, comprising: (a) a resin mold housing having an optical fiber inside a surface mount optical coupler receptacle portion and having a guide hole formed therein; (B) An optical connector plug mounted on the guide hole from the outside and having an optical connector plug capable of aligning with the optical fiber inside the guide hole. 2. The receptacle type surface mount optical coupler according to claim 1, wherein said guide hole has a tapered surface with a space formed outside said optical fiber as a center. Optical coupler. 3. The receptacle type surface mount optical coupler according to claim 1, wherein a locking groove is formed in said resin mold housing, and said engaging claw fixes said optical connector plug in said locking groove. A receptacle type surface mount optical coupler, wherein 4. A receptacle type surface mount optical coupler for transmitting an optical signal, wherein a ferrule-shaped cylindrical portion capable of aligning an external optical connector plug with an internal optical fiber is resin-molded on a surface mount optical coupler receptacle. A receptacle type surface mount optical coupler characterized by being integrally formed with a resin mold housing by using the above method. 5. The receptacle type surface mount optical coupler according to claim 4, wherein a locking groove is formed in the resin mold housing, and an engaging claw for fixing the optical connector plug is engaged with the locking groove. A receptacle type surface mount optical coupler characterized in that it is stopped. 6. A receptacle type surface mount optical coupler for transmitting an optical signal, wherein: (a) an optical isolator having a receptacle and connector function in a surface mount optical coupler receptacle portion; and (b) alignment alignment with the optical isolator. A receptacle type surface mount optical coupler comprising: an optical connector plug. 7. The receptacle type surface mount optical coupler according to claim 6, wherein a locking groove is formed in a housing of the optical isolator, and an engaging claw for fixing the optical connector plug is formed in the locking groove. A receptacle type surface mount optical coupler characterized by being locked.