JPH08338929A - Receptacle type module and its production - Google Patents

Abstract

PURPOSE: To obtain a module which is low in light loss, has high accuracy, is improved in yield, and is reduced in its cost so as to be inexpensively embodied by aligning a marking to an insertion guide and building a short-sized ferrule into a sleeve. CONSTITUTION: The eccentricity of the core of an optical fiber 6 mounted at the short-sized ferrule 5 is checked by, for example, a tool maker's microscope, etc., which check the eccentric direction with respect to the center of the short- sized ferrule 5 before the optical fiber is built together with the short-sized ferrule 5 into the sleeve 7. The end face of the short-sized ferrule 5 is subjected to marking 30 thereon by ink, etc., simultaneously therewith. The eccentricity of the core of the optical fiber 6 is also simultaneously inspected in this checking work. The optical fiber having the eccentricity of, for example, <=0.47μm is accepted as a nondefective article and is rejected as a defective article in other occasions. Further, the short-sized ferrule 5 is press fitted into the sleeve 7 by aligning the marking 30 indicating the eccentric direction into the position corresponding to a key groove 12 in a assembling stage.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a receptacle type module used for optical communication and a method for manufacturing the same.

[0002]

2. Description of the Related Art Today, as a module used in the field of optical communication, a pigtail type, a receptacle type and the like are known. Of these, the receptacle type does not require extra length treatment of the optical fiber as compared with the big tail type, and the mounting area is small, so it is possible to expect miniaturization and low cost. Therefore, the receptacle type module is being put to practical use. .

9 and 10 show an example of a conventional receptacle type module using an SC type optical connector. FIG. 9 is a front view thereof, and FIG. 10 is a sectional view taken along line EE of FIG. is there. Note that FIG. 12 shows an example of an SC type optical connector used in the receptacle type module shown in FIGS. 9 and 10. Therefore, first, the structure of the SC type optical connector will be described with reference to FIG. In FIG. 12, this SC type optical connector 100 is a commercially available product, in which a key 101 is formed on the outer side of one end face, and a pair of outer faces on the other side face each of which is displaced by 90 degrees. Locked portions 102 are formed in the respective. An optical fiber element wire (not shown) is fixedly attached to the center in a state of being extended in its longitudinal direction.

Next, the structure of the receptacle type module shown in FIGS. 9 and 10 will be described. Reference numeral 51 is a compact CD header on which a semiconductor laser element 52 is mounted, and 53 is light from the semiconductor laser element 52. It is a lens for doing. Reference numeral 54 denotes a holder that holds the lens 53 at the center, and the header 51 is fixedly attached to one end of the holder 54 by, for example, resistance welding, welding, or soldering. Reference numeral 55 denotes a short ferrule in which an optical fiber strand 56 is fixed and attached to the center with an adhesive. One end side of the short ferrule 55 facing the lens 53 is formed in a slantingly polished state and the other end side. Is formed in a convex spherical shape. Then, the light from the semiconductor laser element 52 is condensed by the lens 53 and is incident on one end of the optical fiber element wire 56, which propagates through the optical fiber element wire 56 to the other end side of the optical fiber element wire 56. Reportedly. 57
Is a precision-processed sleeve. A short ferrule 55 is press-fitted and fixed in the center of the sleeve 57, and an optical fiber element wire is passed through the sleeve 57. Part 103
Has a removable structure. It should be noted that the end of the connector convex portion 103, which is abutted with the end of the short ferrule 55 formed in the convex spherical shape, has the short ferrule 55.
It has a convex spherical shape similar to the end portion of. Reference numeral 58 denotes a receptacle, and a sleeve 57 is press-fitted and fixed to the center of the receptacle 58. Reference numeral 59 denotes an SC type housing, which is fixedly attached to one end side of the receptacle 58, and an SC type optical connector 100 which is inserted inside the connector convex portion 103 in the direction of arrow F in FIG. A recess 60 is formed for receiving.
In addition, when the SC optical connector 100 is inserted to a predetermined position in the recess 60, a pair of claws 61 are provided at the tips of the claws 61 for engaging with the locked portion 102 and preventing the same from coming off. The hook piece 59a is integrally provided corresponding to the locked portion 102 of the SC optical connector 100. Furthermore, S
The SC type optical connector 10 is provided on the peripheral surface of the C type housing 59.
A key groove (slit) 62 is formed to correspond to the key 101 formed on the outer side of one side of No. 0 (see FIG. 9). The core of the optical fiber element wire 56 fixedly mounted in the short ferrule 55 is usually slightly decentered in terms of accuracy, and the decentering direction is also shown in FIG.
As schematically shown in FIG. 3, the sleeve 57 is press-fitted and fixed in the sleeve 57 while remaining random.

In the module thus constructed, when the SC type optical connector 100 is coupled, the key 101 is made to correspond to the key groove 62 and the SC type optical connector 100 is inserted in the direction of arrow F in FIG. Let At this time, the connector convex portion 103 is inserted into the sleeve 57, and the key groove 62 and the key 101 are engaged with each other to guide the insertion. Furthermore, SC type optical connector 10
When 0 is inserted to a predetermined position, the claw 60 of the hook piece 59a is engaged with the engaged portion 102 to prevent it from coming off, and the SC
The optical connector 100 and the module are combined. When combined, the optical fiber element wire 56 exposed on the other end side of the short ferrule 55 and the SC optical connector 10 are also exposed.
The optical fiber strand on the 0 side is opposed to the optical fiber strand 5
6, the semiconductor laser device 52 being propagated to the other end
Light is further propagated to the SC optical connector 100 side.

14 and 15 show another example of a receptacle type module using a conventional FC type optical connector. FIG. 14 is a front view thereof, and FIG. 15 is a line GG of FIG.
It is sectional drawing which follows the line. It should be noted that FIG. 16 shows an F inserted into the receptacle type module shown in FIGS. 14 and 15.
It shows an example of a C-type optical connector. Therefore, first, the structure of the FC type optical connector will be described with reference to FIG. In FIG. 16, this FC type optical connector 200 is a commercially available product, and a key 201 is formed on the outer surface of one end surface thereof, and a tightening nut 202 is rotatably attached to the outer peripheral surface thereof. An optical fiber element wire (not shown) is fixedly attached to the center in a state of being extended in the longitudinal direction.

Next, the structure of the receptacle type module shown in FIGS. 14 and 15 will be described. Note that FIG. 9 and FIG.
Portions corresponding to the receptacle module shown in 0 will be described with the same reference numerals. 14 and 15, reference numeral 51 is a compact CD header on which the semiconductor laser element 52 is mounted, and 53 is a lens for collecting light from the semiconductor laser element 52. 54 is the lens 5 in the center
3, a header 51 is fixedly attached to one end of the holder 54 by, for example, resistance welding, welding or soldering. Reference numeral 55 is a short-length short ferrule in which an optical fiber element wire 56 is fixed at the center with an adhesive, and one end side of the short-length ferrule 55 facing the lens 53 is formed in a slantingly polished state. The end side is formed in a convex spherical shape. Then, the light from the semiconductor laser element 52 is condensed by the lens 53 and is incident on one end of the optical fiber element wire 56, which is propagated through the optical fiber element wire 56 and the optical fiber element wire 56.
Is transmitted to the other end of the. 57 is a precision-machined sleeve, and at the center of this sleeve 57 is a short ferrule 55.
FC type optical connector 20 in which the optical fiber element wire is passed through the sleeve 57.
It has a structure in which the connector protrusion 203 of 0 is detachable. It should be noted that the end of the connector convex portion 203 that is abutted with the end of the short ferrule 55 formed in the convex spherical shape is formed in the same convex spherical shape as the end of the short ferrule 55 (FIG. 14). Reference numeral 79 is a receptacle which also serves as an FC type housing. A sleeve 57 is press-fitted and fixed to the center of the receptacle 79, and the connector convex portion 203 is inserted into the inside from the direction of arrow H in FIG. A recess 60 for receiving the FC optical connector 200 is formed. Further, on the outer peripheral surface of the portion where the recess 60 is formed, a male screw portion 71 with which the tightening nut 202 on the FC optical connector 200 side is screwed is formed. Further, a key groove (slit) 72 is formed on the peripheral surface of the receptacle 79 so as to correspond to the key 201 formed on the outer side of one side surface of the FC optical connector 200. Here, the optical fiber strand 56 fixedly mounted in the short ferrule 55 is attached.
However, the eccentricity is usually slightly decentered in terms of accuracy, and the eccentricity direction is randomly fixed in the sleeve 57 in the same manner as in the SC type receptacle module.

In the module constructed as described above, when the FC type optical connector 200 is coupled, the key 201 is made to correspond to the key groove 72 and the FC type optical connector 200 is inserted in the direction of arrow H in FIG. Let At this time, the connector protrusion 203 is inserted into the sleeve 57, and the key groove 72 and the key 201 are engaged with each other to guide the insertion. Furthermore, FC type optical connector 20
When 0 is inserted to a predetermined position, the nut 202 is brought into contact with the receptacle 79, and when the tightening nut 202 is rotated, the nut 202 is screwed to the male screw portion 71, and by this screwing, F
The C-shaped optical connector 200 and the module are securely coupled. Further, when coupled, the optical fiber element wire 56 exposed on the other end side in the short ferrule 55 and the optical fiber element wire on the FC optical connector 200 side face each other, and the other end of the optical fiber element wire 56. The light from the semiconductor laser element 52 that has been propagated up to is further propagated to the FC optical connector 100 side.

[0009]

However, as shown in FIG.
In the structure of the conventional module shown in FIGS. 9 and 10 using the SC type optical connector 100 shown in FIG. 10, the eccentric direction of the core of the optical fiber strand 56 formed in the short ferrule 55 is random. When connecting the SC optical connector 100 in the direction of arrow F in FIG. 10, the core portion 56a (see FIG. 13) of the optical fiber strand 56 on the short ferrule 55 side and the optical fiber strand on the SC optical connector 100 side. The positional relationship with the core portion 100a (see FIG. 13) of the SC type optical connector 100 has a large optical output variation (hereinafter referred to as “attachment / detachment variation”) due to repeated attachment / detachment of the module and the SC optical connector 100, and stable optical output. Was not obtained. Note that FIG. 13 shows a state in which when the eccentric directions of the optical fiber strands 56 are random in this way, the loss of light (non-coupling) occurs due to the variation in attachment / detachment of the module to be connected and the SC optical connector 100. Shows. That is, the hatched portion in FIG. 13 is a light loss portion (non-coupling portion) caused by the displacement between the core portion 56a and the core portion 100a. As can be seen from this figure, since the eccentric direction of the optical fiber element wire 56 is random, the optical coupling state changes with each attachment / detachment variation, and a stable optical output cannot be obtained. For this reason, a method is adopted in which the dimensional accuracy of each component is increased to reduce the deviation for each attachment / detachment variation, and thus the yield at the time of manufacturing is deteriorated, but this yield also has a limit, In addition, defective products were discarded, which was uneconomical.

On the other hand, the FC type optical connector 2 shown in FIG.
Also in the conventional module structure shown in FIGS. 14 and 15 using 00, the eccentric directions of the optical fiber strands 56 formed in the short ferrule 55 are random. Therefore, from the direction of the arrow H in FIG.
When connecting 0, and then screwing, the core portion 5 of the optical fiber strand 56 on the short ferrule 55 side
6a (see FIG. 17) and the core portion 200a (see FIG. 17) of the optical fiber strand on the FC optical connector 200 side generate movement. In other words, the positional relationship is such that the module to be connected and the FC optical connector 200 are repeatedly attached and detached, and each time the tightening nut 200 is rotated, the core portion 200a also slightly moves in the rotation direction in accordance with the rotation, and stable light is obtained. No output is obtained. In addition, in FIG. 17, when the eccentric directions of the optical fiber strands 56 are thus random, the module to be connected and the FC type optical connector 2 are connected.
00 shows a state in which a loss part (non-coupling part) of light occurs due to the fluctuation of attachment and detachment of 00. That is, the hatched portion in FIG. 17 is a light loss portion (non-coupling portion) caused by the deviation between the core portion 56a and the core portion 200a. As can be seen from this figure, since the eccentric direction of the optical fiber strand 56 is random, the core portion 200a is repetitively attached and detached.
Rotation changes the optical coupling state, and stable light output cannot be obtained. For this reason, a method is adopted in which the dimensional accuracy of each component is increased to reduce the deviation for each attachment / detachment variation, and the yield at the time of manufacturing is deteriorated by this, but this yield also has a limit, In addition, defective products were discarded, which was uneconomical.

The present invention has been made in view of the above-mentioned problems, and an object thereof is a receptacle-type module which can be realized at a low cost with high accuracy and low optical loss, and at a low cost by improving the yield. It is to provide a manufacturing method.

[0012]

In order to achieve the above object, the module of the present invention has a sleeve held by a housing, and an optical fiber element wire arranged at the center thereof and fixedly mounted in the sleeve. A short ferrule which is inserted into the sleeve until the connector convex portion of the optical connector is brought into contact with the short ferrule to be optically coupled, and between the housing side and the optical connector side. In a receptacle type module provided with an insertion guide made up of a key and a key groove, the short ferrule is provided with a marking indicating the eccentric direction of the core of the optical fiber element wire.

Further, the manufacturing method of the present invention has a sleeve held by a housing, and a short ferrule in which an optical fiber element wire is arranged at the center and fixedly mounted in the sleeve. A connector convex portion of an optical connector is inserted into the sleeve until it comes into contact with the short-length ferrule for optical coupling, and a key and a key groove are inserted between the housing side and the optical connector side. A method of manufacturing a receptacle-type module provided with a guide, wherein an eccentric direction of a core of the optical fiber strand with respect to a center of the short ferrule is detected, and marking indicating the eccentric direction is provided on the short ferrule, Align the marking with the reference position on the housing side and incorporate the short ferrule into the sleeve. Those were.

[0014]

According to this, by incorporating the marking into the insertion guide and incorporating the short ferrule into the sleeve, the eccentric directions of the cores of the optical fiber wires can be made substantially the same in all the receptacle type modules. As a result, it is possible to stably and easily manufacture the receptacle type module with less light loss.

[0015]

Embodiments of the present invention will be described in detail below with reference to the drawings. 1 to 3 show a first embodiment of a receptacle type module according to the present invention. FIG. 1 is an enlarged view of a main part thereof, FIG. 2 is a front view thereof, and FIG.
It is sectional drawing which follows the E line. The receptacle type module shown in the first embodiment is of a type using the SC type optical connector shown in FIG. Therefore, in the following explanation, the same reference numerals as those shown in FIG.
It is compatible with optical connectors.

In FIGS. 1 to 3, reference numeral 1 is a compact CD header on which the semiconductor laser element 2 is mounted, and 3 is a lens for condensing light from the semiconductor laser element 2.
Reference numeral 4 denotes a holder that holds the lens 3 at the center, and the header 1 is attached to one end of the holder 4 by, for example, resistance welding,
It is fixedly attached by welding, soldering, or the like.
Reference numeral 5 is a short ferrule in which an optical fiber element wire 6 is fixed and attached to the center with an adhesive. One end side of the short ferrule 5 facing the lens 3 is formed in a slantingly polished state, and the other end side. Is formed in a convex spherical shape. Then, the light from the semiconductor laser element 2 is condensed by the lens 3 and is incident on one end of the optical fiber element wire 6, which is propagated in the optical fiber element wire 6 to the other end side of the optical fiber element wire 6. Reportedly. Reference numeral 7 denotes a precision-machined sleeve. A short ferrule 5 is press-fitted and fixed in the center of the sleeve 7, and an optical fiber element wire is passed through the sleeve 7. Part 1
03 is a structure that can be inserted. Reference numeral 8 is a receptacle, and a sleeve 7 is press-fitted and fixed to the center of the receptacle 8. Reference numeral 9 denotes an SC type housing, which is fixedly attached to one end side of the receptacle 8 and has an SC type optical connector 100 inserted therein in the direction of arrow B in FIG. A recess 10 is formed for receiving. In addition, when the SC optical connector 100 is inserted to a predetermined position in the recess 10, a pair of claws 11 are provided at the tips thereof, which are engaged with the locked portion 102 to prevent it from coming off. The hook piece 9a is S
It is integrally provided corresponding to the locked portion 102 of the C-shaped optical connector 100. Further, a key groove (slit) 12 is formed on the peripheral surface of the SC type housing 9 so as to correspond to the key 101 formed on the outer side of one side surface of the SC type optical connector 100.

Here, the core of the optical fiber element wire 6 fixedly mounted in the short ferrule 5 is usually slightly decentered in terms of accuracy. Therefore, short ferrule 5
The eccentricity of the core of the optical fiber strand 6 attached to the
The eccentric direction with respect to the center of the short ferrule 5 is confirmed by, for example, a tool microscope, and at the same time, the marking 30 is formed on the end face of the short ferrule 5 with ink or the like (see FIGS. 1 and 2). Further, in the confirmation work here, the eccentricity of the core of the optical fiber element wire 6 is also inspected at the same time, and if the eccentricity is 0.4 μm or less, it is judged as a good product, and if it is more than that, it is rejected as a defective product. Further, in the assembly process, the sleeve 7 is fixed to the receptacle 8 in advance, and the short ferrule 5 is press-fitted and fixed to the sleeve 7 fixed to the receptacle 8. At this time,
The marking 30 representing the eccentric direction is aligned with the position corresponding to the key groove 12, and the short ferrule 5 is attached to the sleeve 7.
Press in. That is, in this receptacle module, the core of the optical fiber element wire 6 is always eccentric in a fixed direction, that is, in the direction corresponding to the key groove 12 (the "eccentric direction" indicated by the arrow in FIG. 1). .

In the module thus constructed, when the SC type optical connector 100 is coupled, the key 101 is made to correspond to the key groove 12 and the SC type optical connector 100 is inserted in the direction of arrow B in FIG. Let At this time,
The connector convex portion 103 is inserted into the sleeve 7, and the key groove 12 and the key 101 are engaged with each other to guide the insertion. Further, when the SC type optical connector 100 is inserted to a predetermined position, the claw 10 of the hook piece 9a is engaged with the engaged portion 102 and prevented from coming off, so that the SC type optical connector 100 and the module mechanically. Be combined. Further, when this mechanical coupling is made, the optical fiber strand 6
The end on the SC type optical connector 100 side is brought into contact with the other end of the short ferrule 5 whose end is exposed. Note that the abutting portion here is subjected to biconvex spherical surface polishing to enable light coupling. Hereinafter, this abutting portion is referred to as an "optical coupling portion", and the direction of the eccentric direction of the core of the optical fiber element wire 6 toward the key groove 12 is referred to as the "eccentric direction". Further, when optically coupled in this manner, the light from the semiconductor laser element 2 is condensed by the lens 3 and the optical fiber element wire 6 is formed.
Is transmitted to the other end side of the optical fiber elemental wire 6 and is further transmitted to the SC type optical connector 100 side through the optical coupling portion.

Therefore, when the eccentric direction is defined in this way, the core portion 6a (see FIG. 4) of the optical fiber element wire 6 on the short ferrule 5 side and the SC type optical connector 10 are provided.
Even if the module to be connected and the SC-type optical connector 100 are repeatedly attached and detached, the positional relationship between the core side 100a (see FIG. 4) of the optical fiber wire on the 0 side is unidirectional and is tolerable. Since it is regulated within the range of the eccentricity, the area of the light loss portion (the portion shown by hatching in FIG. 4) is reduced, and a stable light output can be obtained. In addition, FIG. 4 shows a state where a loss part (non-coupling part) of light occurs due to attachment / detachment variation of the module to be connected and the SC optical connector 100 when the eccentric direction of the core of the optical fiber element wire 6 is defined. Shows. That is, compared to the conventional structure shown in FIG. 13, that is, the conventional structure in which the eccentric direction of the core of the optical fiber element wire 6 is random, the area of the light loss portion is smaller and a stable light output can be obtained. It will be. Therefore, since the dimensional accuracy of each component can be made relatively gentle, the yield at the time of manufacturing can be improved, the manufacturing can be simplified, and the cost can be reduced and the cost can be provided at low cost.

FIGS. 5 to 7 show a second embodiment of the receptacle type module according to the present invention. FIG. 5 is an enlarged view of a main part thereof, FIG. 6 is a front view thereof, and FIG. It is sectional drawing which follows the C line. Further, the receptacle type module shown in the second embodiment is an example of a type using the FC type optical connector shown in FIG. Therefore, in the following description, the parts denoted by the same reference numerals as those shown in FIG. 16 correspond to the FC type optical connector shown in FIG. Further, parts corresponding to those of the second embodiment shown in FIGS. 5 to 7 and the first embodiment shown in FIGS. 1 to 3 will be described with the same reference numerals.

In FIGS. 5 to 7, reference numeral 1 is a compact CD header on which the semiconductor laser device 2 is mounted.
Is a lens for collecting the light from the semiconductor laser element 2. Reference numeral 4 denotes a holder that holds the lens 3 in the center, and the header 1 is fixedly attached to one end of the holder 4 by, for example, resistance welding, welding, soldering, or the like. Reference numeral 5 is a short ferrule in which an optical fiber element wire 6 is fixed and attached to the center with an adhesive. One end side of the short ferrule 5 facing the lens 3 is formed in a slantingly polished state, and the other end side. Is formed in a convex spherical shape. Then, the light from the semiconductor laser element 2 is condensed by the lens 3 and is incident on one end of the optical fiber element wire 6, which is propagated in the optical fiber element wire 6 to the other end side of the optical fiber element wire 6. Reportedly. Reference numeral 7 is a precision-machined sleeve. A short ferrule 5 is press-fitted and fixed in the center of the sleeve 7, and an optical fiber element wire is passed through the sleeve 7. The structure is such that the portion 203 can be press-fitted. Reference numeral 29 is a receptacle that also serves as an FC type housing. A sleeve 7 is press-fitted and fixed in the center of the receptacle 29, and the connector convex portion 203 is inserted into the inside in the direction of arrow D in FIG. The recess 10 for receiving the FC type optical connector 200 is formed.
Further, on the outer peripheral surface of the portion where the recess 10 is formed, the tightening nut 202 on the FC optical connector 200 side is provided.
Is formed with a male screw portion 21. further,
The FC type optical connector 200 is provided on the peripheral surface of the receptacle 29.
A key groove (slit) 22 is formed corresponding to the key 201 formed on the outer side of one side surface.

Here, the core of the optical fiber element wire 6 fixedly mounted in the short ferrule 5 is usually slightly decentered in terms of accuracy. Therefore, short ferrule 5
The eccentricity of the core of the optical fiber strand 6 attached to the
The eccentric direction with respect to the center of the short ferrule 5 is confirmed by, for example, a tool microscope, and at the same time, the marking 30 is formed on the end face of the short ferrule 5 with ink or the like (see FIGS. 5 and 6). Also, in the confirmation work here, the eccentricity of the core of the optical fiber element wire 6 is inspected at the same time, and if the eccentricity is 0.4 μm or less, it is judged as a good product, and if it is more than that, it is rejected as a defective product. Further, in the assembly process, the sleeve 7 is previously fixed to the receptacle 29, and the sleeve 7 fixed to the receptacle 29 is fixed.
On the other hand, the short ferrule 5 is press-fitted and fixed. At this time, the marking 30 showing the eccentric direction is attached to the key groove 22.
The short ferrule 5 is press-fitted into the sleeve 7 at a position corresponding to. That is, in this receptacle module, the core of the optical fiber element wire 6 is always eccentric in a fixed direction, that is, in the direction corresponding to the key groove 22 (the "eccentric direction" indicated by the arrow in FIG. 5). .

In the module thus constructed, when the FC type optical connector 200 is coupled, the key 201 is made to correspond to the key groove 22 and the FC type optical connector 200 is inserted in the direction of arrow D in FIG. Let At this time,
The connector protrusion 203 is pressed into the sleeve 7, and the key groove 22 and the key 201 are engaged with each other to guide the insertion. Further, when the FC type optical connector 200 is inserted to a predetermined position, the nut 202 is brought into contact with the receptacle 29. Further, when the tightening nut 202 is rotated, the tightening nut 202 is screwed into the male screw portion 21, and by this screwing, the FC optical connector 200 and the module are mechanically coupled. When this mechanical connection is made, the end on the FC optical connector 200 side is brought into contact with the other end of the short ferrule 5 where the end of the optical fiber element wire 6 is exposed. The abutting portion here is polished on both convex spherical surfaces, so that light can be coupled. Hereinafter, this contact portion
As in the case of the above embodiment, the "optical coupling portion" is referred to, and the eccentric direction of the core of the optical fiber element wire 6 is referred to as the "eccentric direction". Further, when optically coupled in this way, the light from the semiconductor laser element 2 is condensed by the lens 3 and is incident on one end of the optical fiber element wire 6, which is propagated in the optical fiber element wire 6 to be propagated in the optical fiber element wire 6. 6 is transmitted to the other end side and further transmitted to the FC type optical connector 200 side through the optical coupling portion.

Therefore, when the eccentric direction is defined in this way, the core portion 6a (see FIG. 8) of the optical fiber element wire 6 on the short ferrule 5 side and the FC type optical connector 20 are provided.
Even if the module to be connected and the FC type optical connector 200 are repeatedly attached and detached due to the positional relationship with the core portion 200a (see FIG. 8) of the optical fiber strand on the 0 side, the deviation between the two is allowed in one direction and allowed. Since it is regulated within the range of the eccentricity, the area of the light loss portion (the portion shown by hatching in FIG. 8) is reduced, and a stable light output can be obtained. In addition, FIG. 8 shows a state in which when the eccentric direction of the core of the optical fiber element wire 6 is defined, the loss of light (non-coupling) occurs due to the variation in attachment / detachment of the module to be connected and the FC optical connector 200. Shows. That is, in the conventional structure shown in FIG. 13, that is, in comparison with the conventional structure in which the eccentric direction of the core of the optical fiber element wire 6 is random, the area in the light loss portion is smaller and a stable optical output can be obtained. It will be. Therefore, since the dimensional accuracy of each component can be made relatively gentle, the yield at the time of manufacturing can be improved, the manufacturing can be simplified, and the cost can be reduced and the cost can be provided at low cost.

In the above embodiment, the structure in which the SC type optical connector is used is the first embodiment, and
The structure using the C-type optical connector has been described as the second embodiment, but other optical connectors such as an MU-type optical connector and an ST-type optical connector can also be applied. .

[0026]

As described above, according to the present invention,
By incorporating the marking into the sleeve and incorporating the short ferrule into the sleeve, the eccentric directions of the cores of the optical fiber wires can be made substantially the same in all the receptacle modules. As a result, it is possible to stably and easily manufacture the receptacle type module with less light loss, and it is possible to improve the quality and stabilize the quality.

[Brief description of drawings]

FIG. 1 is an enlarged view of a main part of a module shown as a first embodiment of the present invention.

FIG. 2 is a front view of the module shown as the first embodiment of the present invention.

3 is a sectional view taken along the line AA of FIG.

FIG. 4 is a diagram for explaining the effect obtained in the first embodiment of the present invention.

FIG. 5 is an enlarged view of a main part of a module shown as a second embodiment of the present invention.

FIG. 6 is a front view of a module shown as a second embodiment of the present invention.

7 is a cross-sectional view taken along the line CC of FIG.

FIG. 8 is a diagram for explaining the effect obtained in the second embodiment of the present invention.

FIG. 9 is a front view of a module shown as a conventional example.

10 is a cross-sectional view taken along the line EE of FIG.

FIG. 11 is an explanatory diagram of an eccentric direction of an optical fiber element wire in a conventional module.

FIG. 12 is a side view showing an example of an SC optical connector.

FIG. 13 is an explanatory diagram of problems in the conventional module.

FIG. 14 is a front view of a module shown as another conventional example.

15 is a cross-sectional view taken along the line GG of FIG.

FIG. 16 is an explanatory diagram of a problem in a module shown as another example of the related art.

FIG. 17 is a side view showing an example of an FC type optical connector.

[Explanation of symbols]

 2 Semiconductor laser element 3 Lens 5 Short ferrule 6 Optical fiber element wire 7 Sleeve 8 Receptacle 12, 22 Key groove 30 Marking 100, 200 SC optical connector 101, 201 Key 103, 203 Connector protrusion

Claims (8)

[Claims] 1. A sleeve, which is held by a housing, and a short ferrule, in which an optical fiber element wire is arranged at the center and is fixedly mounted in the sleeve, wherein an optical connector of the optical connector is provided in the sleeve. A receptacle-type module in which a connector protrusion is inserted until it comes into contact with the short-length ferrule for optical coupling, and a insertion guide made up of a key and a key groove is provided between the housing side and the optical connector side. 2. The receptacle-type module, wherein the short ferrule is provided with a marking indicating the eccentric direction of the core of the optical fiber element wire. 2. The receptacle-type module according to claim 1, wherein the marking is defined in the insertion guide direction. 3. The receptacle type module according to claim 1, wherein an SC type optical connector is used as the optical connector. 4. The receptacle type module according to claim 1, wherein an FC type optical connector is used as the optical connector. 5. The receptacle type module according to claim 1, wherein a MU type optical connector is used as the optical connector. 6. The receptacle type module according to claim 1, wherein an ST type optical connector is used as the optical connector. 7. A sleeve held by a housing, and a short ferrule in which an optical fiber element wire is arranged at the center and fixedly mounted in the sleeve, and an optical connector of the optical connector is provided in the sleeve. A receptacle-type module in which a connector protrusion is inserted until it comes into contact with the short-length ferrule for optical coupling, and a insertion guide made up of a key and a key groove is provided between the housing side and the optical connector side. In the manufacturing method, the eccentric direction of the core of the optical fiber strand with respect to the center of the short ferrule is detected, and markings indicating the eccentric direction are provided on the short ferrule, and the marking is provided on a reference position on the housing side. A receptacle-type module characterized in that the short ferrule is also incorporated in the sleeve. Manufacturing method Le. 8. The method of manufacturing a receptacle-type module according to claim 7, wherein the marking is defined in the insertion guide direction.