JPH10160959A - Optical multiplexing and demultiplexing structure and optical multiplexing and demultiplexing module using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a simple structure which demultiplexes or multiplexes only a specific light from an optical fiber that transmits lights of different wavelength. SOLUTION: In the optical multiplexing and demultiplexing structure which demultiplexes or multiplexes the lights of different wavelengths transmitted in the optical fiber 20, the optical finer 20 is provided with a cut part 21 in a V-shaped flank shape having a vertical surface 20a perpendicular to the optical axis as one end surface and a slanting surface 20b slanting the optical axis as the other surface across the core part of the optical fiber 20, and a reflecting filter 22 which reflects only the specific light transmitted in the optical fiber 20 selectively and totally is provided on the slanting surface 20b to demultiplex the light.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical multiplexing / demultiplexing structure which can be used for an optical subscriber terminal and an optical multiplexing / demultiplexing module using the same.

[0002]

2. Description of the Related Art In optical communication, various signals are transmitted and received by transmitting light through an optical fiber. In communication using this optical fiber, a method of transmitting and receiving signals by transmitting light of different wavelengths through the same optical fiber is generally used. An optical subscription terminal (Optical Network Unit) is a terminal module used for transmitting and receiving optical communication signals in each home and the like.

FIG. 18 shows a conventional configuration of an optical subscriber terminal module. In the figure, reference numeral 10 denotes a common port optical fiber. The common port optical fiber 10 has 1.3 μm and 1.0 μm.
Light having a wavelength of 55 μm is transmitted. Reference numeral 12 denotes a light multiplexing / demultiplexing module for multiplexing / demultiplexing light having wavelengths of 1.3 μm and 1.55 μm. The 1.3 μm light demultiplexed by the multiplexing / demultiplexing module unit 12 is introduced into the receiving port 14, and
The 5 μm light is guided to a 1.55 μm port optical fiber 16. Signal from light emitting element 18 (wavelength 1.3 μm)
Are multiplexed with light of 1.55 μm via the waveguide 19 and transmitted from the common port.

[0004] As described above, the optical subscribing terminal module transmits / receives a signal by multiplexing / demultiplexing light, and the most important part of its function is the optical multiplexing / demultiplexing module 12. It is. As a device for multiplexing and demultiplexing light, a device using a light waveguide has been used. The method of using the light waveguide is such that a dielectric multilayer film is provided on a substrate, light is transmitted in the waveguide, and the light is totally reflected by a cut surface provided in the waveguide. (Japanese Patent Laid-Open No. 3-103804).

[0005]

It is an essential operation for transmitting and receiving signals to combine and demultiplex light in optical communication. However, the above-described device using an optical waveguide requires a high technology. However, there is a problem that the production cost increases. Since the optical subscription terminal is generally used for optical communication, a module that can be manufactured at a lower cost as a popular module is desired. The present invention can be mass-produced at a low cost by simplifying the configuration compared with the conventional optical multiplexing / demultiplexing element, and can be used for general purposes. It is an object of the present invention to provide an optical multiplexing / demultiplexing structure that can be suitably used as a module and an optical multiplexing / demultiplexing module using the same.

[0006]

The present invention has the following arrangement to achieve the above object. That is, in an optical multiplexing / demultiplexing structure in which light of different wavelengths transmitted in an optical fiber is demultiplexed or multiplexed, one end face of the optical fiber is perpendicular to the optical axis across the core of the optical fiber. A V-shaped cut portion is provided as a vertical surface and the other surface is an inclined surface inclined with respect to the optical axis, and selectively reflects only specific light transmitted through the optical fiber on the inclined surface. A feature is added. Further, a reflection filter is provided on the inclined surface. In addition, a half mirror that transmits the specific light incident on the inclined surface by transmitting through the optical fiber to the inclined surface and totally reflects the specific light incident on the inclined surface from the opposite side is provided. It is characterized by. Further, the cut portion is filled with a medium having a predetermined refractive index in order to set conditions for total reflection from an inclined surface and the like.

In addition, as an optical multiplexing / demultiplexing module, an optical fiber for transmitting an optical signal is provided such that one end face is perpendicular to the optical axis, and the other face is perpendicular to the optical axis. On the other hand, a cut portion having a V-shaped side surface provided as an inclined surface is provided, and a function of selectively totally reflecting only specific light transmitted through the optical fiber is provided to the inclined surface to form an optical multiplexing / demultiplexing structure. And a light receiving or light emitting element that receives light reflected from the inclined surface of the cut portion or emits light toward the inclined surface of the cut portion, and is mounted in alignment with the cut portion. I do. In addition, a plurality of optical multiplexing / demultiplexing structures are provided for splitting and extracting specific light from an optical fiber transmitting a plurality of lights of different wavelengths, and a light receiving element is arranged in each of the optical multiplexing / demultiplexing structures. . Further, a light emitting element for transmitting an optical signal toward an end face of the optical fiber is arranged. Further, the optical fiber is characterized in that the outer surface of the optical fiber has a rectangular cross section, and the optical fiber is supported by a support substrate provided with a concave groove for accommodating and supporting the optical fiber. Further, the optical fiber is supported on a film with a wiring pattern. In addition, an optical multiplexing / demultiplexing module configured by aligning a light receiving or light emitting element with respect to an optical multiplexing / demultiplexing structure for splitting or multiplexing light of different wavelengths transmitted through an optical fiber supports the optical fiber. A guide block formed in a frame shape is used as a member, and a concave portion for guiding and supporting the optical fiber is provided in one of the opposing frame portions of the guide block, and between the other opposing frame portions of the guide block. In a direction orthogonal to the longitudinal direction of the optical fiber, and aligned with the mounting position of the light receiving or light emitting element, one surface is formed as a vertical surface perpendicular to the optical axis, and the other surface is A guide prism formed on an inclined surface that is inclined with respect to the optical fiber is supported, and one optical fiber having an end surface perpendicular to one surface of the guide bism is brought into contact with and supported by the guide prism. The other surface of the prism is contacted with and supported by the other surface of the optical fiber having an end surface inclined, and a light receiving or light emitting element is received from a side opposite to a side on which the guide prism is supported, within a frame portion of the guide block. It is characterized by being mounted by being guided on the inner surface of the part. Also,
The guide prism is formed integrally with the guide block by resin molding using a light transmitting resin material forming the guide prism. Further, the guide block is mounted in an element hole provided on the film with a wiring pattern, and the conductor pattern provided on the film with a wiring pattern is electrically connected to the light receiving or light emitting element.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of an optical multiplexing / demultiplexing structure according to the present invention will be described below in detail with reference to the accompanying drawings. The optical multiplexing / demultiplexing structure according to the present invention is obtained by providing a light multiplexing / demultiplexing structure on an optical fiber itself used as an optical signal transmission path. FIG. 1 shows an embodiment in which an optical fiber 20 is provided with a light demultiplexing structure. That is, 1.3 μm and 1.5 μm introduced from the optical fiber 20 on the common port side.
The 5 μm light is split into 1.55 μm and 1.3 μm light at the splitting structure portion, and the 1.55 μm light is reflected and received by the light receiving element 30, and the 1.3 μm light remains in the optical fiber 20. Is configured to proceed.

The light demultiplexing structure crosses the core of the optical fiber 20 and has one end surface from which light exits from the common port side as a vertical surface 20a perpendicular to the optical axis and the other surface on which light enters. An inclined surface 20b inclined with respect to the optical axis is provided with a V-shaped cut portion 21. The 1.55 μm light is selectively totally reflected on the surface of the inclined surface 20b, and 1.3 μm light is transmitted. The reflective filter 22 is provided.

The reflection filter 22 only needs to have a function of totally reflecting light of 1.55 μm and transmitting light of 1.3 μm, and the material and the like are not particularly limited. The condition of total reflection on the inclined surface 20b varies depending on the refractive index of the medium on both sides of the reflection surface (boundary surface), the inclination angle of the inclined surface 20b, and the like. The condition setting can also be changed by filling the cut portion 21 cut into a V shape with a light-transmitting medium having a predetermined refractive index. Although 1.3 μm light is refracted by the inclined surface 20 b, it does not matter much for the light traveling in the optical fiber 20. In addition, it is also possible to arrange the optical fiber 20 on the emission side slightly inclined in accordance with the refraction angle on the inclined surface 20b.

In the example shown in FIG. 1, the light introduced from the optical fiber 20 on the common port side into the branching structure is split into 1.55 μm light and 1.3 μm light by the above configuration.
A light signal of 1.55 μm is detected by the light receiving element 30.
The 3 μm light travels further through the optical fiber 20. Of course, it is also possible to adopt a configuration in which a light emitting element is mounted instead of the light receiving element 30 and the light of the light emitting element is transmitted to the common port side due to the regression of light. That is, if the light emitting element is mounted at the position of the light receiving element 30 and the light is sent from the light emitting element toward the reflection filter 22 in the same direction as in FIG. 1, the light totally reflected by the reflection filter 22 becomes the light on the common port side. It is sent into the fiber 20. This effect is a light multiplexing effect. That is, the demultiplexing structure shown in FIG. 1 is also a light multiplexing / demultiplexing structure.

FIG. 2 shows a structure in which the light receiving element 32 receives 1.3 μm light that has been split by the splitting structure shown in FIG. That is, in this multiplexing / demultiplexing structure portion, a V-shaped cut portion 21 having a cross-sectional shape is provided in the optical fiber 20, and 1.3 μm light is reflected by the light receiving element 32 by totally reflecting 1.3 μm light on the inclined surface 20 d. Detect. 1. Injected from the vertical surface 20c to the inclined surface 20d
A half mirror 24 that totally reflects 3 μm incident light and transmits 1.3 μm light entering from the opposite side of the optical fiber 20 is provided. The 1.3 μm light that enters from the opposite side of the optical fiber 20 is light emitted from the light emitting element and is transmitted as signal light or the like. The structure shown in FIG. 2 is also a light multiplexing / demultiplexing structure.

The above optical multiplexing / demultiplexing structure is 1.55 μm and 1.
Although the light is multiplexed / demultiplexed with respect to light of 3 μm, this optical multiplexing / demultiplexing structure can be commonly used as a structure for multiplexing / demultiplexing light having different wavelengths. That is, it can be used when three or more different lights are transmitted to one optical fiber 20 and only one light is selectively demultiplexed, and when the light other than the above wavelength is multiplexed / demultiplexed, the inclined surface 20b can be used. , 20 d, and the functions of the reflection filter 22 and the half mirror 24, can be selectively combined and demultiplexed.

FIGS. 3 and 4 show examples in which the above-described optical multiplexing / demultiplexing structure is applied to an optical multiplexing / demultiplexing module of an actual optical access terminal. FIG. 3 is a plan view of the optical multiplexing / demultiplexing module, and FIG. 4 is a side view. Reference numeral 40 denotes a support substrate of the optical multiplexing / demultiplexing module, which supports the optical fiber 20 and the light receiving elements 30 and 32.
The support substrate 40 is formed in a rectangular plate shape, and the optical fiber 20
As shown in FIG. 3, one end of the support substrate 40 is arranged linearly toward the other end of the support substrate 40 at a substantially center in the width direction of the support substrate 40 using one end of the support substrate 40 as a common port. Reference numeral 34 denotes a light-emitting element that emits light (1.3 μm) toward the other end surface of the optical fiber 20.

The optical fiber 20 is provided with two cut portions 21 as the above-described optical multiplexing / demultiplexing structure. The cut portions 21 are aligned with the cut portions 21 as shown in FIG. 32 is installed. Light receiving element 30 is 1.55μ
The light receiving element 32 is a light receiving unit for 1.3 μm light. Lights of 1.55 μm and 1.3 μm are incident from the common port side, and in the multiplexing / demultiplexing structure at the cutting portion 21 provided with the light receiving element 30, the light having the structure shown in FIG.
55 μm light is demultiplexed and received, and in the multiplexing / demultiplexing structure provided with the light receiving element 32, 1.3 μm is obtained by the configuration of FIG.
m is received. The 1.3 μm light emitted from the light emitting element 34 passes through the cutting section 21 and is sent to the common port side. Thereby, a signal can be transmitted from the light emitting element 34.

In FIG. 3, reference numeral 36 denotes a conductor pattern for connecting the light receiving elements 30, 32 and the light emitting element 34 to an external electric circuit. These conductor patterns 36 are formed on the upper surface of the support substrate 40, and the light receiving elements 30, 32 and the light emitting element 34 are electrically connected to these conductor patterns 36 and mounted.
As the support substrate 40, for example, a substrate obtained by forming a conductive pattern 36 on a surface of a glass plate by sputtering, vapor deposition, plating, or the like can be used.

FIG. 5 shows light receiving elements 30, 32 and light emitting element 34.
A plan view of the support substrate 40 before mounting the
The method of assembling is shown. A concave groove 42 for mounting the optical fiber 20 is provided at the center of the support substrate 40.
An element recess 44 for mounting the light emitting element 34 is provided at an end of the device. In the present embodiment, a pair of assembly substrates 40a and 40b having a conductor pattern
The assembly substrates 40a and 40b are combined from the left and right with a space serving as a concave groove 42 provided on the
The assembly substrates 40a and 40b are fixed to
Get. 36a and 36b are electrode portions electrically connected to the light receiving elements 30 and 32. The light receiving elements 30, 32 are connected to the electrode portions 36a, 36b by flip chip bonding.

The concave groove 42 is formed in a space in which the optical fiber 20 can be inserted just according to the outer diameter of the optical fiber 20. That is, the width and the depth of the concave groove 42 are made to match the diameter of the optical fiber 20. Since the optical fiber 20 has a light multiplexing / demultiplexing structure, the optical fiber 20 is
2, the position of the multiplexing / demultiplexing structure is set to the light receiving element 30,
At the same time, the optical fiber 20 is fixed to the installation position of the optical fiber 20 with an adhesive or the like, and the reflection surface or the like in the multiplexing / demultiplexing structure is accurately set. In the light multiplexing / demultiplexing structure, light is split by using reflection on an inclined surface, so that the reflected surface must be accurately set with respect to the optical axis in order to make the split light enter the light receiving elements 30 and 32 accurately. There is. As shown in FIG. 6, the inclined surfaces 20b and 20d are displaced (rotated) with respect to the optical axis.
Then, the incident position of the reflected light on the light receiving elements 30 and 32 is shifted.

FIG. 7 shows an embodiment in which the optical fiber 20 is correctly set in the concave groove 42. In this embodiment, the outer surface of the optical fiber 20 is formed in a rectangular shape having the same shape as the cross-sectional shape of the concave groove 42, and the inclined surface 20b of the optical fiber 20 is automatically aligned by setting the optical fiber 20 in the concave groove 42. I can do it. By supporting the optical fiber 20 having a rectangular cross-sectional shape so as to be sandwiched between the assembly substrates 40a and 40b, the optical fiber 20 can be prevented from rotating and set accurately.

FIG. 8 shows a method of processing the optical fiber 20 having a rectangular cross section. The optical fiber 20 on the side provided with the reflection surface used in the optical multiplexing / demultiplexing structure functions to accurately set the angle of the light reflection surface and to perform evaporation and the like on the reflection surface to function as a reflection filter or a half mirror. Must be granted. The processing method shown in FIG. 8 is an efficient method in which the outer surface of the optical fiber 20 can be formed in a rectangular shape, the light reflection surface can be formed at a predetermined angle, and a reflection filter and a half mirror can be easily formed. It is.

FIG. 8A shows an alignment jig for aligning and supporting the optical fibers 20 constituting the light multiplexing / demultiplexing structure. The alignment jig 50 is provided with a concave groove 50a for arranging a plurality of optical fibers 20 one by one in parallel. The cross-sectional shape of the concave groove 50a corresponds to the supporting substrate 4 of the optical multiplexing / demultiplexing module.
This is the same as the concave groove 42 provided in “0”. FIG. 8B shows a state in which the concave groove 50a is filled with an ultraviolet curable resin 52 in order to make the outer surface of the optical fiber 20 rectangular. Note that the rectangular shape of the outer surface of the optical fiber 20 means that the ultraviolet curing resin 5 is used.
2 means that the outer surface of the optical fiber 20 is coated, and the outer surface of the coated ultraviolet curable resin 52 is made rectangular in cross section.

FIG. 8C shows a state in which one optical fiber 20 is inserted into each concave groove 50a filled with the ultraviolet curing resin 52. The width and depth of the concave groove 50a are determined by the optical fiber 2
0, the optical fiber 20
Is arranged at the center of the concave groove 50a. Next, as shown in FIG. 8D, a glass plate 54 is placed on the alignment jig 50 to press the ultraviolet curable resin 52, and the concave groove 50a is filled with the ultraviolet curable resin 52. FIG. 9 shows a groove 50a formed by a glass plate 54.
FIG. 3 is an end view of a state where the inside is filled with an ultraviolet curable resin 52. The optical fiber 20 having a circular cross-sectional shape is supported just between the side surfaces, the upper surface, and the bottom surface of the concave groove 50a.

While the optical fiber 20 and the ultraviolet curable resin 52 are held down by the glass plate 54, the ultraviolet light is irradiated through the glass plate 54 to cure the ultraviolet curable resin 52. Accordingly, the outer surface of the optical fiber 20 can be formed in a rectangular cross-section in the same manner as the concave groove 42 provided in the support substrate 40. In the present embodiment, the ultraviolet curable resin 52 is used to make the cross-sectional shape of the optical fiber 20 rectangular. However, if the resin has a certain shape retaining property, a simple curable resin is used instead of the ultraviolet curable resin. Of course, it doesn't matter.

In this processing method, next, the end face of the optical fiber 20 is processed into a predetermined inclined surface. As shown in FIG. 10 (a), the end face of the optical fiber 20 is polished at a predetermined angle while the optical fiber 20 is pressed between the alignment jig 50 and the glass plate 54 as shown in FIG. Do by doing. By this polishing, the end face of the optical fiber 20 is also formed with a predetermined inclined surface at the same time as the alignment jig 50. Then
A reflection filter or a half mirror is formed on the inclined surface of the optical fiber by a vapor deposition method or the like. This operation such as vapor deposition may be performed on the end face 50b of the optical fiber 20 in a state where the optical fiber 20 is supported by the alignment jig 50 as shown in FIG. Thus, the same function can be given to all the optical fibers 20 supported by the alignment jig 50.

After these operations are completed, the alignment jig 50
By removing the optical fiber 20 from each of the concave grooves 50a, as shown in FIG. 10 (c), the end surface is formed at a predetermined inclination angle, and a function of a required reflection filter or the like is provided. An optical fiber 20 having a rectangular shape is obtained. As shown in FIG. 7, the optical fiber 20 is provided with concave grooves 42 so as to be sandwiched from both sides by the assembly substrates 40a and 40b.
By setting the optical fiber inside the optical fiber 20, it is possible to function as an optical fiber 20 having a predetermined optical multiplexing / demultiplexing function. The above-described method of manufacturing the optical fiber 20 has an advantage that it is extremely efficient as a method of producing the optical fiber 20 used in the optical multiplexing / demultiplexing module.

The optical multiplexing / demultiplexing module of the above embodiment is configured by supporting the optical fiber 20 on a rigid support substrate 40. 11 and 12 show an embodiment in which an optical multiplexing / demultiplexing module is configured using a flexible TAB tape.
FIG. 11 is a plan view of an optical multiplexing / demultiplexing module in which an optical fiber 20 is supported on a film with a wiring pattern such as a TAB tape 60, and FIG. 12 is a side view. As in the above-described embodiment, the optical fiber 20 is provided with a cut portion 21 as a multiplexing / demultiplexing structure, and each cut portion 21 is positioned and attached to the light receiving elements 30 and 32. A light emitting element 34 is provided at the end of the optical fiber 20.
Is also the same as in the above-described embodiment. The light receiving element 30 receives the light of 1.55 μm by the multiplexing / demultiplexing structure of the light transmitted from the common port side, and the light receiving element 32 receives the light of 1.3 μm. The optical fiber 2
Alternatively, the cut portion 21 of 0 and the light receiving portions of the light receiving elements 30 and 32 may be aligned and fixed with a light-transmitting adhesive.

In the present embodiment, the light receiving elements 30 and 32 and the light emitting element 34 are housed in an element hole 62 provided in a TAB tape 60, and are suspended by bonding to a lead 64 extending inside the element hole 62. Lead 64 is TAB tape 6
0 and are formed integrally with and electrically connected to the conductor pattern 36 provided on the surface. FIG. 13 shows a state where the light receiving elements 30 and 32 are supported by the TAB tape 60 when viewed from the side, and FIG. 14 shows a state when viewed from the front. The optical fiber 20 is formed in a rectangular cross section in the same manner as in the above-described embodiment, and both sides are supported by the fiber guide 66 and supported by the TAB tape 60. As shown in FIG. 12, the optical fiber 20 is supported by fiber guides 66 at both side edges in the longitudinal direction. The fiber guide 66 can be formed at the same time when the copper foil is etched with the TAB tape 60 to form the conductor pattern 36.

FIG. 14 shows an enlarged structure in which the optical fiber 20 is guided by the fiber guide 66 and the light receiving elements 30 and 32 are bonded to and suspended from the leads 64. Light demultiplexed by the light multiplexing / demultiplexing structure enters the light receiving elements 30 and 32 and is received. Reference numeral 68 denotes a bonding portion between the lead 64 and the light receiving elements 30 and 32. As shown in FIG. 12, the light emitting element 34 is attached with the end face of the optical fiber 20 as an inclined surface, and the light projected into the optical fiber 20 from the light emitting element 34 is totally reflected by the inclined surface and passes through the optical fiber 20. Transmit.

The optical multiplexing / demultiplexing module according to the present embodiment uses the flexible TAB tape 60 as a base material, so that the optical fiber 20 can be easily installed with a slight inclination. TAB tape 60 having conductive pattern 36 and element hole 62 can be easily obtained by applying a method for manufacturing a TAB tape used in a conventional semiconductor device, and high-density wiring can be easily achieved. .

FIG. 15 shows still another embodiment of the optical multiplexing / demultiplexing module. In this embodiment, a frame-shaped guide block 70 is used in order to facilitate the alignment between the light multiplexing / demultiplexing structure and the light receiving elements 30 and 32. The guide block 70 has one facing frame 70
a, 70a, concave portions 71, 71 for guiding and supporting the optical fiber 20 in accordance with the outer diameter of the optical fiber 20.
Is provided on the same side as the side on which the concave portions 71, 71 are provided, and is passed between the other facing frame portions 70b, 70b.
The guide prism 72 is arranged in a direction orthogonal to the longitudinal direction of the zero. The concave portions 71, 71 and the guide prism 72 are
The positional relationship is set so that the optical axes coincide when the optical fiber 20 is attached to the first and the first 71.

The guide prism 72 is a guide block 70
The frame portions 70a, 70b are formed separately from the frame portions 70a, 70b.
Although it may be fixed to 70b, it is possible to easily and accurately position the concave portion 71 by molding the resin integrally with the frame portions 70a and 70b using a transparent resin to be the guide prism 72. The inner dimensions of the guide block 70 are set to the dimensions in which the light receiving elements 30 and 32 are just stored, and when the light receiving elements 30 and 32 are mounted on the guide block 70, the light receiving portions of the light receiving elements 30 and 32 are aligned with the optical axis. The positional relationship with the guide prism 72 is set so as to automatically match.

The guide block 70 is used together with the guide block 70 in the element hole 62 of the TAB tape 60 on which the required conductor pattern 36 is formed, as in the above-described embodiment. 16 and 17 show the guide block 70 with TAB.
Affixed to the tape 60, the optical fiber 20 and the light receiving element 30,
FIG. 3 is a side view and a cross-sectional view of a state where 32 is mounted. FIG.
As shown in FIG. 17, the light receiving elements 30 and 32 are inserted into and mounted on the guide block 70 from the side opposite to the side where the guide prism 72 is provided, and the leads 64 are bonded. By inserting the light receiving elements 30 and 32 into the guide block 70 and mounting them, the light receiving elements 30 and 32 are automatically aligned with the multiplexing / demultiplexing structure.

When the optical fiber 20 is mounted, the optical fiber 20 is inserted into the concave portion 70a of the guide block 70, and the end face of the optical fiber 20 is brought into contact with the guide prism 72.
At that position, the optical fiber 20 is fixed with an optically transparent adhesive. The guide prism 72 has one surface formed perpendicular to the optical axis and the other surface inclined with respect to the optical axis. The end face of the optical fiber 20 is formed in a vertical plane and an inclined plane, respectively, in accordance with the vertical plane and the inclined plane of the guide prism 72. The inclined surface at the end face of the optical fiber 20 is provided with a function of splitting predetermined light such as a reflection filter or a half mirror similar to the above-described embodiment.

In the optical multiplexing / demultiplexing module according to this embodiment, the optical axis of the optical fiber 20 and the light receiving elements 30 and 32 can be matched by abutting the optical fiber 20 against the guide prism 72. There is an advantage in that the optical multiplexing / demultiplexing structure portion and the light receiving elements 30 and 32 can be easily positioned by mounting the guide block 32 on the guide block 70. In the above embodiment, the optical fiber 20 having a circular cross section is used. However, by using the optical fiber 20 having a rectangular cross section, the optical fiber 20 can be prevented from rotating and the alignment can be further facilitated.

In each of the above embodiments of the optical multiplexing / demultiplexing module, the optical fiber 20 is arranged linearly, and the light receiving elements 30, 32 and the light emitting element 34 are arranged in the same direction (parallel).
The optical multiplexing / demultiplexing structure described above is
Need not be arranged linearly. That is, the optical fiber 20 can be arranged in a bent shape, and the light receiving elements 30, 32 and the light emitting element 34 can be oriented differently. In addition, it is also possible to adopt a configuration in which a light emitting element is mounted in place of the light receiving element in the above-described embodiment due to the regression of light, or a configuration in which a light receiving element is mounted in place of the light emitting element. .

[0036]

According to the optical multiplexing / demultiplexing structure according to the present invention, as described above, the optical fiber for transmitting the optical signal is provided with the optical multiplexing / demultiplexing function, so that the multiplexing / demultiplexing of the light is simplified. This is made possible by the configuration, and the manufacturing cost of the optical multiplexing / demultiplexing module can be suitably reduced. Further, by utilizing this optical multiplexing / demultiplexing structure, it is easy to manufacture an optical multiplexing / demultiplexing module which is a main component of the optical subscription terminal module, and it is possible to provide a product which can be suitably used for general use. And so on.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing an embodiment of a light multiplexing / demultiplexing structure.

FIG. 2 is an explanatory diagram showing an embodiment of a light multiplexing / demultiplexing structure.

FIG. 3 is a plan view of an optical multiplexing / demultiplexing module using an optical fiber.

FIG. 4 is a side view of an optical multiplexing / demultiplexing module using an optical fiber.

FIG. 5 is a plan view and a front view of a support substrate of the optical multiplexing / demultiplexing module.

FIG. 6 is an explanatory diagram showing a state in which a reflection surface of an optical fiber is shifted from a normal position.

FIG. 7 is an explanatory diagram showing a state in which an optical fiber having a rectangular cross section is installed in a concave groove.

FIG. 8 is an explanatory view showing a method of manufacturing an optical fiber used in the optical multiplexing / demultiplexing module.

FIG. 9 is an explanatory diagram showing a state in which an ultraviolet curable resin is irradiated with ultraviolet light.

FIG. 10 is an explanatory diagram showing a method of forming an end surface of an optical fiber on an inclined surface.

FIG. 11 is a plan view of an optical multiplexing / demultiplexing module using a TAB tape.

FIG. 12 is a side view of an optical multiplexing / demultiplexing module using a TAB tape.

FIG. 13 is an enlarged side view showing a mounting portion of the light receiving element.

FIG. 14 is an enlarged front view showing a mounting portion of the light receiving element.

FIG. 15 is an assembly diagram of an optical multiplexing / demultiplexing module configured using a guide block.

FIG. 16 is a side view of an optical multiplexing / demultiplexing module using a guide block.

FIG. 17 is a front view of an optical multiplexing / demultiplexing module using a guide block.

FIG. 18 is an explanatory diagram showing a configuration of an optical subscription terminal module.

[Explanation of symbols]

 Reference Signs List 10 optical fiber 12 multiplexing / demultiplexing module 20 optical fiber 20a, 20c vertical plane 20b, 20d inclined plane 21 cut section 22 reflection filter 24 half mirror 30, 32 light receiving element 34 light emitting element 36 conductor pattern 36a, 36b electrode section 40 support substrate 40a , 40b Assembly board 42 Depressed groove 44 Element concave part 50 Alignment jig 50a Recessed groove 52 UV curable resin 60 TAB tape 62 Element hole 64 Lead 66 Fiber guide 70 Guide block 70a, 70b concave part 72 Guide prism

Claims (12)

[Claims] 1. An optical multiplexing / demultiplexing structure for splitting or multiplexing light of different wavelengths transmitted through an optical fiber, wherein the optical fiber traverses a core portion of the optical fiber and has one end face as an optical axis. A V-shaped cut portion is provided in which a vertical surface is perpendicular to the other surface and the other surface is an inclined surface inclined with respect to the optical axis, and only the specific light transmitted through the optical fiber is selectively provided on the inclined surface. An optical multiplexing / demultiplexing structure characterized by having a function of total reflection. 2. The optical multiplexing / demultiplexing structure according to claim 1, wherein a reflection filter is provided on the inclined surface. 3. A half mirror that transmits the specific light incident on the inclined surface through the optical fiber to the inclined surface and totally reflects the specific light incident on the inclined surface, and passes the specific light incident on the inclined surface from the opposite side. The optical multiplexing / demultiplexing structure according to claim 1, wherein the optical multiplexing / demultiplexing structure is provided. 4. The optical multiplexing / demultiplexing structure according to claim 1, wherein the cut portion is filled with a medium having a predetermined refractive index in order to set conditions for total reflection from an inclined surface and the like. 5. An optical fiber for transmitting an optical signal, comprising an inclined surface having one end face perpendicular to the optical axis and the other face inclined with respect to the optical axis, across the core of the optical fiber. A cut portion having a V-shaped side surface is provided, and the inclined surface is provided with a function of selectively totally reflecting only specific light transmitted through the optical fiber to constitute an optical multiplexing / demultiplexing structure. An optical multiplexing / demultiplexing module characterized in that a light receiving or light emitting element that receives light reflected from the inclined surface or emits light toward the inclined surface of the cut portion is mounted in alignment with the cut portion. 6. A plurality of optical multiplexing / demultiplexing structures for demultiplexing and extracting specific light from an optical fiber transmitting a plurality of light beams having different wavelengths, and a light receiving element is arranged in each of the optical multiplexing / demultiplexing structures. The optical multiplexing / demultiplexing module according to claim 5, wherein: 7. A light-emitting device for transmitting an optical signal toward an end face of the optical fiber, wherein a light-emitting element is provided.
Or the optical multiplexing / demultiplexing module according to 6. 8. The optical fiber according to claim 5, wherein the outer surface of the optical fiber is rectangular in cross section, and the optical fiber is supported by a support substrate provided with a concave groove for accommodating and supporting the optical fiber. 8. The optical multiplexing / demultiplexing module according to claim 6, 6 or 7. 9. The optical multiplexing / demultiplexing module according to claim 5, wherein the optical fiber is supported on a film with a wiring pattern. 10. An optical multiplexing / demultiplexing module in which a light receiving or light emitting element is positioned with respect to an optical multiplexing / demultiplexing structure for demultiplexing or multiplexing light of different wavelengths transmitted in an optical fiber. A guide block formed in a frame shape is used as a member for supporting the optical fiber, and a concave portion for guiding and supporting the optical fiber is provided in one of the opposite frame portions of the guide block, and the other opposite frame of the guide block is provided. Between the sections, in a direction perpendicular to the longitudinal direction of the optical fiber, and aligned with the mounting position of the light receiving or light emitting element, one surface is formed as a vertical surface perpendicular to the optical axis, the other surface Supports a guide prism formed on an inclined surface that is inclined with respect to the optical axis, and supports one optical fiber having an end surface perpendicular to one surface of the guide bism. In addition, the other surface of the guide prism is in contact with and supports the other optical fiber having an end surface inclined, and inside the frame of the guide block, light is received or received from the opposite side of the side where the guide prism is supported. An optical multiplexing / demultiplexing module, wherein a light emitting element is mounted while being guided by an inner surface of the frame portion. 11. The optical multiplexing / demultiplexing module according to claim 10, wherein the guide prism is formed integrally with the guide block by resin molding using a light-transmissive resin material constituting the guide prism. . 12. The device according to claim 1, wherein the guide block is mounted in an element hole provided in the film with a wiring pattern, and the conductor pattern provided in the film with a wiring pattern is electrically connected to the light receiving or light emitting element. The optical multiplexing / demultiplexing module according to claim 10.