JP2007052194A - Waveguide type single core bidirectional communication module - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a waveguide type single core bidirectional communication module in which the mix rate of the light to be transmitted to received light is reduced. <P>SOLUTION: An optical waveguide 49 is composed by dividing a path into a light emitting side and a light receiving side, and has an incident end face 58 opposing to a light emitting element 47, an emitting end face 59 opposing to a light receiving element 48 and an incident/emitting end face 57 opposing to the end face of the optical fiber. An optical waveguide member 50 is so arranged that the incident end face 58 and the emitting end face 59 of the optical waveguide 49 are arranged on the side of a member end part 61 and the incident/emitting end face 57 is arranged on the side of the other member end part 60. An optical waveguide base 52 has an element arranging part 62 on which the light emitting element 47 and the light receiving element 48 are arranged side by side and an optical fiber side connecting part 63. A recessed housing part 51 has a fixing structure which fixes the optical waveguide member 50 matching it with the positions of the light emitting element 47, the light receiving element 48 and the optical fiber. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a single-core bidirectional communication module that performs two-way communication by transmitting two light beams having different wavelengths to a single-core optical fiber, and more particularly, a light-emitting element, a light-receiving element, and an optical waveguide having an optical waveguide. The present invention relates to a waveguide-type single-core bidirectional communication module including a waveguide member and an optical waveguide base having a storage recess for storing the optical waveguide member.

  As a conventional single-core bidirectional communication module, one disclosed in Patent Document 1 below is known. In FIG. 14, the conventional single-core bidirectional communication module 1 has an optical waveguide member 2. A multilayer optical filter 4 is provided on the end surface 3 of the optical waveguide member 2. The optical waveguide member 2 has a first optical waveguide 5 and a second optical waveguide 6 which are coupled in a V shape on the end surface 3. The single core bidirectional communication module 1 includes a light emitting element 7 and a light receiving element 8. The light emitting element 7 is disposed at the end of the first optical waveguide 5. In addition, the light receiving element 8 is disposed on the back side of the multilayer optical filter 4. The light emitting element 7 and the light receiving element 8 are disposed at different positions as shown in the figure.

In the conventional single-core bidirectional communication module 1, when the first wavelength light A from the light emitting element 7 is incident on the end face 3 via the first optical waveguide 5, the first wavelength light A is emitted from the multilayer optical filter. 4, and is coupled to the optical fiber 9 through the second optical waveguide 6. In addition, when the second wavelength light B from the optical fiber 9 is incident on the end face 3 via the second optical waveguide 6, the conventional single-core bidirectional communication module 1 causes the second wavelength light B to be multilayered. The light passes through the optical filter 4 and passes through the air layer 10 to be coupled to the light receiving element 8. Note that reference numeral 11 in FIG. 14 indicates an optical resin layer covering the multilayer optical filter 4.
JP 2004-287186 A (page 3, FIG. 1)

  By the way, the prior art has a problem regarding the V-shaped coupling between the first optical waveguide 5 and the second optical waveguide 6. That is, since the coupling between the first optical waveguide 5 and the second optical waveguide 6 is a considerably acute angle, the first wavelength light A from the light emitting element 7 is emitted from the multilayer optical filter 4. If the first wavelength light A passes through the multilayer optical filter 4 and is coupled by the light receiving element 8, there is a problem that it becomes noise light.

  With regard to the V-shaped coupling, it has been found that a highly accurate filter is necessary in order to sufficiently reflect the first wavelength light A. However, there is a problem that it leads to a significant cost increase.

  In the above prior art, the second wavelength light B transmitted through the multilayer optical filter 4 is coupled to the light receiving element 8 only after passing through the optical resin layer 11 and the air layer 10. There is a problem in that the distance between the second optical waveguide 6 and the light receiving element 8 increases due to the presence of the optical resin layer 11 and the air layer 10, resulting in a decrease in optical coupling efficiency.

  Further, in the above prior art, since the arrangement of the light emitting element 7 and the light receiving element 8 is opposed to each other, this arrangement has a problem that the module size is increased. .

  Furthermore, in the above prior art, regarding the arrangement of the light emitting element 7 and the light receiving element 8, etc., if the arrangement is made by active alignment, there is a problem that an expensive device is required, or production It has a problem of affecting the sex.

  This invention is made | formed in view of the situation mentioned above, and makes it a subject to provide the waveguide type single core bidirectional | two-way communication module which reduces the mixing rate to the received light of the light which should be transmitted. It is another object of the present invention to provide a small waveguide type single-core bidirectional communication module having high optical coupling efficiency. It is another object of the present invention to provide a waveguide type single-core bidirectional communication module that is easy to align and has good productivity.

  The waveguide type single-core bidirectional communication module according to claim 1, which has been made to solve the above-described problems, includes a light emitting element and a light receiving element, an optical waveguide member having an optical waveguide, and the optical waveguide member. And an optical waveguide base having a storage recess for branching, wherein the optical waveguide is branched from the light emitting side and the light receiving side, and is opposite to the light receiving element and the incident end surface facing the light emitting element. The optical waveguide member has the incident end surface and the output end surface of the optical waveguide disposed on one end side of the optical waveguide, and the incident end surface is opposed to the end surface of the optical fiber. An emission end face is arranged on the other member end side, and the optical waveguide base includes an element arrangement part in which the light emitting element and the light receiving element are arranged side by side, and an optical fiber side connection part on the optical fiber side. And the above The receiving recess has a fixing structure that fixes the optical waveguide member in accordance with the positions of the light emitting element, the light receiving element, and the optical fiber. .

  According to the present invention having such characteristics, the light emitting element and the light receiving element are arranged side by side. Further, the optical waveguide of the optical waveguide member has a path branched to the light emitting side and the light receiving side, the incident end face of the light emitting side path is opposed to the light emitting element, and the light emitting end face of the light receiving side path is opposed to the light receiving element. It has a structure.

  According to the present invention, the received light emitted from the optical fiber and incident on the optical waveguide via the incident / exit end face passes through the path on the light receiving side, and is emitted from the exit end face and coupled to the light receiving element. ing. On the other hand, the transmission light from the light emitting element enters the optical waveguide through the incident end face, and is emitted from the exit end face through the branch portion of the optical waveguide and coupled to the optical fiber. Since the light emitting element and the light receiving element are arranged side by side, the structure is such that the transmitted light from the light emitting element does not go directly to the light receiving element.

  According to the present invention, there is a possibility that slight Fresnel reflection at the incident / exit end face or the end face of the optical fiber becomes noise light. Thus, the noise light can be remarkably reduced as compared with the case where the light is reflected by the multilayer optical filter in front of this.

  According to the present invention, the optical waveguide member is housed in the housing recess of the optical waveguide base. The light emitting element and the light receiving element are arranged in an element arrangement portion that is continuous with the housing recess, and the optical fiber side connection portion is continuous with the housing recess. When the optical waveguide member is stored in the storage recess, the optical waveguide member is positioned and fixed in accordance with a predetermined position, that is, the positions of the light emitting element, the light receiving element, and the optical fiber. The optical waveguide member is structured to be positioned and fixed in the storage recess without using a special device.

  In the present invention, although not particularly limited, optical fiber: PCS (Polymer Clad Silica), core diameter φ200 μm, clad diameter φ230 μm, optical waveguide: polymer optical waveguide, light emitting element: VCSEL (Vertical Cavity Surface Emitting Laser), As an example, two wavelengths of 805 nm and 855 nm, a light receiving element: Si PIN photodiode, an optical waveguide base: a resin molded product, and a transmission speed: 500 Mbps are exemplified.

  A waveguide-type single-core bidirectional communication module according to a second aspect of the present invention is the waveguide-type single-core bidirectional communication module according to the first aspect, wherein noise light is present in the middle of the path on the light receiving side or on the emission end face. An optical filter for removal is provided, or the entrance / exit end face is formed obliquely.

  According to the present invention having such a feature, a slight Fresnel reflection at the input / output end face or the optical fiber end face is removed by the optical filter. Further, in the case of an oblique shape, the structure is such that Fresnel reflected light at the incident / exit end face exits from the optical waveguide. In other words, the structure is difficult to return to the optical waveguide. In the present invention, an example of the optical filter is a dielectric multilayer filter.

  A waveguide-type single-core bidirectional communication module according to a third aspect of the present invention is the waveguide-type single-core bidirectional communication module according to the first or second aspect, wherein the light-receiving side path is connected to the light-emitting side. It is characterized by being formed thicker than the path.

  According to the present invention having such a feature, the ratio of the received light passing through the path on the light receiving side is increased. As a result, the power of light coupled to the light receiving element is increased and the optical coupling efficiency is improved. In the case where a laser is used for the light emitting element, the structure is such that erroneous modulation due to incidence of return light to the laser during operation is reduced.

  A waveguide-type single-core bidirectional communication module according to a fourth aspect of the present invention is the waveguide-type single-core bidirectional communication module according to the first or second aspect, wherein the light receiving side path is linearly formed. In addition, the light-emitting side path and the light-receiving side path are formed asymmetrically.

  According to the present invention having such characteristics, the optical coupling efficiency is improved. As an asymmetric shape, a substantially y-shape or the like is given as an example. The asymmetric shape naturally includes a shape in which the light receiving side path is thicker than the light emitting side path.

  The waveguide type single core bidirectional communication module according to claim 5 of the present invention is the waveguide type single core bidirectional communication module according to any one of claims 1 to 4, wherein the width of the incident end face is set to the light emitting side. It is characterized by being formed wider than the width of the path.

  According to the present invention having such a feature, the width of the incident end face is made wider than the width of the path on the light emitting side, and the allowable value of the deviation of the optical axis between the light emitting element and the optical waveguide is increased. It has become. Note that a structure in which the width of the emission end face is narrower than the width of the light receiving side path and the received light is condensed on the light receiving element may be added to the light receiving side path.

  According to the first aspect of the present invention, the mixing ratio of the light to be transmitted to the received light can be remarkably reduced as compared with the prior art. Therefore, there is an effect that it is possible to provide a waveguide type single-core bidirectional communication module in which noise light countermeasures are taken. In addition, according to the present invention, there is an effect that it is possible to provide a small waveguide type single-core bidirectional communication module with high optical coupling efficiency. Furthermore, according to the present invention, there is an effect that it is possible to provide a waveguide type single-core bidirectional communication module that is easy to align and has good productivity.

  According to the second aspect of the present invention, there is an effect that the influence of Fresnel reflection can be suppressed. According to the present invention described in claims 3 and 4, there is an effect that the optical coupling efficiency can be improved. According to the fifth aspect of the present invention, there is an effect that the allowable value of the deviation of the optical axis between the light emitting element and the optical waveguide can be increased.

  Hereinafter, description will be given with reference to the drawings. 1 is a perspective view of an optical connector comprising an optical connector plug and an optical connector receptacle, FIG. 2 is an exploded perspective view of the optical connector receptacle of FIG. 1 including the waveguide type single-core bidirectional communication module of the present invention, and FIG. 4 is a perspective view of the waveguide type single-core bidirectional communication module in a state where the ferrules are opposed to each other, and FIG. 5 is a perspective view of the waveguide type single-core bidirectional communication module according to the invention. FIG. 6 is a plan view of a module, FIG. 6 is a plan view of an optical waveguide member and an optical waveguide base, and FIG.

  In FIG. 1, reference numeral 21 indicates an optical connector for single-core bidirectional communication used for optical communication in a moving body such as an automobile, optical communication in a house / building, and the like. The optical connector 21 includes an optical connector plug 23 provided on the terminal side of the optical fiber 22 and an optical connector receptacle 24 provided on the substrate side (not shown). The optical connector 21 is optically coupled (connected) by fitting between the optical connector plug 23 and the optical connector receptacle 24. Hereafter, each said structural member is demonstrated.

  The optical fiber 22 has a core and a clad having a refractive index lower than that of the core. The optical fiber 22 is, for example, PCS (Polymer Clad Silica) and has a core diameter of φ200 μm and a clad of φ230 μm (an example is assumed. Using other general optical fibers) Be good). A ferrule 25 (see FIG. 4) is provided at the end of the optical fiber 22. The ferrule 25 (see FIG. 4) is configured such that the end face of the optical fiber 22 is exposed from this end face.

  The optical connector plug 23 includes a synthetic resin housing 26, a spring (not shown), and a synthetic resin spring cap 27. Here, when the front side of the optical connector plug 23 is defined as the front side with the optical connector receptacle 24, a fitting space (not shown) is formed in the front of the housing 26. In addition, a ferrule storage chamber (reference numeral omitted) is formed at the rear inside the housing 26. The fitting space (not shown) and the ferrule storage chamber (not shown) are formed so as to be continuous in the front-rear direction. A locking arm 28 for fitting with the optical connector receptacle 24 and a locking portion 29 for locking the spring cap are formed outside the housing 26.

  It is assumed that the spring (not shown) and the spring cap 27 are attached to the optical fiber 22 in advance before attaching the ferrule 25 (see FIG. 4). The spring cap 27 is formed in a plate shape so as to cover the opening portion of the ferrule storage chamber (reference numeral omitted) at the rear portion of the housing 26. The spring cap 27 is formed with a locking projection 30 that is hooked to the locking portion 29. Reference numeral 31 in the spring cap 27 indicates a through hole for the optical fiber 22.

  The optical connector plug 23 is assembled when the ferrule 25 (see FIG. 4) of the end of the optical fiber 22 is housed in the ferrule housing chamber (not shown) and the spring cap 27 is fitted and locked to the rear portion of the housing 26. It is supposed to be. A spring (not shown) exists between the ferrule 25 (see FIG. 4) and the spring cap 27. When a pressure is received from the optical connector receptacle 24 side, the ferrule 25 (see FIG. 4) returns to its original position. The power to return is generated.

  1 and 2, an optical connector receptacle 24 includes a synthetic resin casing 33 having a connector housing portion 32, a waveguide type single-core bidirectional communication module 34 of the present invention, a transmitter circuit portion 35, And a receiver circuit unit 36. The optical connector receptacle 24 is assembled by housing and fixing the waveguide type single-core bidirectional communication module 34 in a state where the transmitter circuit unit 35 and the receiver circuit unit 36 are connected in the housing 33. The casing 33 includes a casing main body 37 and a cover 38. The connector housing portion 32 is coupled to the housing body 37 side. Here, as the front-rear direction of the optical connector receptacle 24, the fitting side with the optical connector plug 23 is defined as the front.

  The connector housing portion 32 is formed in a box-like shape with an open front surface so as to have a fitting space 39 with the optical connector plug 23. The connector housing portion 32 is formed with a locking portion 40 where the locking arm 28 of the optical connector plug 23 is hooked and locked. The housing main body 37 is a shallow box-shaped member having an open top surface, and a connector housing portion 32 is coupled to the front surface. Inside the housing body 37, a module housing part 41, a circuit mounting part 42, and a board connecting part 43 are formed. A plurality of locking portions 44 for the cover 38 are formed outside the housing body 37.

  The connector housing portion 32 and the module housing portion 41 are formed so as to communicate with each other having an opening (not shown) that opens at least to the size of the ferrule 25 (see FIG. 4). The module housing part 41 and the board connecting part 43 are formed in a recessed shape that is one step lower than the circuit mounting part 42. A plurality of through holes (reference numerals omitted) are formed at the bottom of the substrate connecting portion 43. The connection portions 45 of the transmitter circuit portion 35 and the receiver circuit portion 36 are electrically connected to a circuit on a substrate (not shown) through the through-hole (not shown). The transmitter circuit unit 35 and the receiver circuit unit 36 are both formed in a plate shape (separate in the figure, but the circuit units can also be integrated).

  The cover 38 is formed in a shape that can cover the upper surface opening of the housing body 37. The cover 38 is formed with a plurality of locking projections 46 that are hooked to the corresponding locking portions 44 of the housing body 37. The cover 38 and the housing main body 37 are formed such that when they are fitted and locked, the waveguide type single-core bidirectional communication module 34 and the like housed therein can be fixed without looseness.

  2 to 6, the waveguide type single-core bidirectional communication module 34 includes a light emitting element 47 and a light receiving element 48, an optical waveguide member 50 having an optical waveguide 49, and a storage for storing the optical waveguide member 50. An optical waveguide base 52 having a recess 51 and an optical filter 53 are provided. Although not particularly limited, in this embodiment, the light emitting element 47: VCSEL (Vertical Cavity Surface Emitting Laser), wavelengths of 805 nm and 855 nm, the light receiving element 48: Si PIN photodiode, and the optical waveguide 49: made of polymer An optical waveguide, an optical waveguide base 52: a resin molded product, and an optical filter 53: a dielectric multilayer filter are used (assumed to be an example).

  2 to 7, the optical waveguide member 50 is a plate-like member having a rectangular shape in plan view (the shape is an example. In this embodiment, the ridge is also formed as a chip-like member), An optical waveguide 49 is formed. The optical waveguide 49 has a core and a clad having a refractive index lower than that of the core. The optical waveguide 49 is formed to have a desired path.

  In this embodiment, the optical waveguide 49 has a common path 54, a light emitting side path 55, and a light receiving side path 56 and is formed in a substantially y shape. Specifically, the path is branched from a common path 54 into a light-emitting side path 55 and a light-receiving side path 56 (see FIGS. 5 to 7). The common path 54 and the light-receiving side path 56 are formed straight and thicker than the light-emitting side path 55. The light-emitting side path 55 is thin and has a bent portion.

  The branching ratio (thickness ratio) between the light-emitting side path 55 and the light-receiving side path 56 is 1: 3 in this embodiment (this is an example. In this embodiment, the branching ratio is 1). : 3, the loss of received light guided to the light receiving element 47 side can be reduced to 1 dB or less). The optical waveguide 49 is formed so that the light-emitting side path 55 and the light-receiving side path 56 are asymmetrical.

  The common path 54 has an incident / exit end face 57 that faces the end face of the optical fiber 22. The light-emitting side path 55 has an incident end face 58 that faces the light-emitting element 47. The light receiving side path 56 has an emission end face 59 that faces the light receiving element 48. The incident / exit end face 57 is arranged and formed so as to be flush with the flat member end 60 existing on the front side of the optical waveguide member 50. The incident end face 58 and the outgoing end face 59 are arranged and formed so as to be flush with the flat member end 61 existing on the rear side of the optical waveguide member 50.

  In this embodiment, the optical waveguide 49 is formed in a substantially y-shape (lower-case y), but this is not restrictive. For example, a Y shape (uppercase Y), a V shape, or the like may be used. However, the positional relationship among the incident end face 58, the outgoing end face 59, and the incoming / outgoing end face 57 is assumed to be the same as described above. In addition, regarding the material and manufacturing method of the optical waveguide member 50, the technique previously proposed by the applicant of the present application and disclosed in Japanese Patent Laid-Open No. 2005-165181 is given as an example.

  2 to 6, the optical waveguide base 52 includes an accommodation recess 51, an element placement portion 62 continuous with the accommodation recess 51, and an optical fiber side connection portion 63 communicating with the accommodation recess 51. It is formed in such a shape (assumed to be an example). The housing recess 51 is formed so that the optical waveguide member 50 can be fixed in accordance with the positions of the light emitting element 47, the light receiving element 48, and the optical fiber 22 (not particularly shown, A structure for mounting and fixing the optical waveguide member 50 in the press-fitting type is provided.The mounting and fixing in the press-fitting type has an advantage that productivity is improved because active alignment is not required. Is surrounded by the front wall of the optical waveguide base 52 and the left and right side walls.

  An optical fiber side connection portion 63 is formed through the front wall of the optical waveguide base 52. The optical fiber side connection part 63 is formed according to the shape of the ferrule 25. The element placement portion 62 is formed at the rear portion of the optical waveguide base 52. The element arrangement portion 62 is formed so that the light emitting element 47 and the light receiving element 48 can be arranged and fixed side by side. Since the light emitting element 47 and the light receiving element 48 are arranged side by side, the structure is such that the transmitted light from the light emitting element 47 does not go directly to the light receiving element 48.

  The optical filter 53 is fixed to a boundary portion between the storage recess 51 and the element arrangement portion 62. Specifically, it is arranged so as to be in contact with the emission end face 59 of the optical waveguide 49 facing the light receiving element 48 (assumed as an example. It may be arranged in the middle of the path 56 on the light receiving side. To do). The optical filter 53 is an optical filter for removing noise light.

  In the above configuration, the signal light transmitted by the optical fiber 22 is emitted from the end face of the optical fiber 22 and enters the inside through the incident / exit end face 57 of the optical waveguide 49. The received light that has entered the optical waveguide 49 passes through the light receiving side path 56 and exits from the exit end face 59. Then, the light passes through the optical filter 53 and is coupled to the light receiving element 48. On the other hand, the transmission light from the light emitting element 47 enters the inside through the incident end face 58 of the optical waveguide 49. Then, the light exits from the exit end face 57 through the branch portion of the optical waveguide 49 and is coupled to the optical fiber 22.

  According to the present invention, since the light emitting element 47 and the light receiving element 48 are arranged side by side, the structure is such that transmission light from the light emitting element 47 does not go directly to the light receiving element 48. That is, the arrangement structure is different from the conventional example. In the configuration and structure described above, slight Fresnel reflection occurs at the incident / exit end face 57 or the end face of the optical fiber 22, but since the optical filter 53 is provided, noise light does not enter the light receiving element 48. .

  Here, an example in which the optical filter 53 is not used will be described. In FIG. 8, the incident / exit end face 57 of the optical waveguide 49 is formed in an oblique shape as shown. Such an incident / exit end face 57 has a structure in which Fresnel reflection exits the optical waveguide 49 (see the broken arrow). In addition, as a case where the optical filter 53 is not used, there may be a case where the optical filter 53 is not necessary depending on the communication speed.

  FIG. 9 is an explanatory diagram when the entrance end face 58 and the exit end face 59 are tapered. In FIG. 9, the width of the incident end face 58 is formed wider than the width of the light-emitting side path 55. In other words, the incident end face 58 is coupled with a taper 64 having an interval extending toward the incident end face 58. The taper 64 is formed to allow a larger deviation of the optical axis between the light emitting element 47 and the optical waveguide 49. On the other hand, the width of the emission end face 59 is formed narrower than the width of the path 56 on the light receiving side. A taper 65 whose width is narrowed toward the emission end face 59 is coupled to the emission end face 59. The taper 65 is formed to collect the received light on the light receiving element 48. Here, both the tapers 64 and 65 are formed, but only the taper 64 may be formed.

  FIG. 10 is a plan view showing an example in which a transceiver of a resin package is mounted. As described above, the waveguide type single-core bidirectional communication module 34 may be mounted with a resin package transmitter 66 and receiver 67 instead of the light emitting element 47 and the light receiving element 48 described above.

  As described above with reference to FIGS. 1 to 10, according to the present invention, there is an effect that the mixing ratio of the light to be transmitted to the received light can be significantly reduced as compared with the conventional case. Therefore, there is an effect that it is possible to provide the waveguide type single-core bidirectional communication module 34 in which measures against noise light are taken compared with the conventional one. In addition, according to the present invention, as can be seen from the above-described configuration and structure, there are the effects that the optical coupling efficiency can be increased and the size can be reduced, and that the productivity can be increased with ease of alignment.

  Next, another example of the waveguide type single-core bidirectional communication module of the present invention will be described with reference to FIGS. 11 is a perspective view showing another example, FIG. 12 is an exploded perspective view of the waveguide type single core bidirectional communication module of FIG. 11, and FIG. 13 is a perspective view of the waveguide type single core bidirectional communication module of FIG. is there. In addition, the same code | symbol shall be attached | subjected to the same fundamental component as the above-mentioned, and description shall be abbreviate | omitted.

  11 to 13, a waveguide type single-core bidirectional communication module 71 includes a light emitting element 47 and a light receiving element 48, an optical waveguide member 73 having an optical waveguide 72, an optical filter 53, and an optical waveguide base 74. It is prepared for.

  The optical waveguide member 73 is a plate-like member having a rectangular shape in plan view (the shape is an example. In this embodiment, the optical waveguide member 73 is also formed as a chip-like member), and the optical waveguide 72 is formed. The optical waveguide 72 has a core and a clad having a refractive index lower than that of the core. The optical waveguide 72 is formed to have a desired path.

  In this embodiment, the optical waveguide 72 has a light emitting side path 75 that is slightly bent and a light receiving side path 76 that is also slightly bent, and is formed in a substantially V shape. Specifically, the path is branched into a path 75 on the light emitting side and a path 76 on the light receiving side (see FIG. 12). The light receiving side path 76 is formed to be slightly thicker than the light emitting side path 75 (the same thickness may be used).

  The optical waveguide 72 has an incident / exit end face 77 that faces the end face of the optical fiber 22. The light emitting side path 75 has an incident end face 78 that faces the light emitting element 47. The light receiving side path 76 has an emission end face 79 facing the light receiving element 48. The incident / exit end face 77 is arranged and formed so as to be flush with the flat member end 80 existing on the front side of the optical waveguide member 73. The incident end face 78 and the outgoing end face 79 are arranged and formed so as to be flush with the flat member end 81 existing on the rear side of the optical waveguide member 73.

  The optical waveguide base 74 has a base body 82 and a pair of substrate fixing portions 83 that are continuous with the base body 82. The base body 82 has a storage recess 84, an element placement portion 85 that communicates with the storage recess 84, and an optical fiber side connection portion 86 that communicates with the storage recess 84, and is formed in a shape as illustrated. . The housing recess 84 is formed so that the optical waveguide member 73 can be fixed in accordance with the positions of the light emitting element 47, the light receiving element 48, and the optical fiber 22 (the optical waveguide member 73 is provided in the housing recess 84. A structure for mounting and fixing with a press-fitting type is applied.)

  A substrate fixing portion 83 that is continuous with the base body 82 is formed with a substrate insertion slit 87 and a screw hole 88 in a direction perpendicular to the slit 87. Although not particularly illustrated, the transmitter circuit unit 35 and the receiver circuit unit 36 (see FIG. 2) are inserted into the slit 87.

  In the above configuration, when the light emitting element 47 and the light receiving element 48 are fixed to the element arrangement portion 85 of the optical waveguide base 74 and the optical waveguide member 73 is attached and fixed to the housing recess 84 of the optical waveguide base 74, the waveguide type single core is obtained. The assembly of the bidirectional communication module 71 is completed. The assembled waveguide type single-core bidirectional communication module 71 is connected to the transmitter circuit unit 35 and the receiver circuit unit 36 (see FIG. 2) via the lead frames 89 of the light emitting element 47 and the light receiving element 48. When the optical waveguide base 74, the transmitter circuit unit 35, and the receiver circuit unit 36 are fixed, and the ferrule 25 at the end of the optical fiber 22 is connected via the optical fiber side connection unit 86, the optical Connection is completed and transmission / reception light can be transmitted.

  It goes without saying that the waveguide type single-core bidirectional communication module 71 having the above configuration and structure also has the same effect as the above-described waveguide type single-core bidirectional communication module 34.

  In addition, it goes without saying that the present invention can be variously modified without departing from the spirit of the present invention.

It is a perspective view of the optical connector which consists of an optical connector plug and an optical connector receptacle. FIG. 2 is an exploded perspective view of the optical connector receptacle of FIG. 1 including the waveguide type single-core bidirectional communication module of the present invention. It is a perspective view of the waveguide type single core bidirectional communication module of the present invention. It is a perspective view which shows the waveguide type single core bidirectional | two-way communication module (except a light emitting element and a light receiving element) of the state which made the ferrule oppose. It is a top view (only an optical waveguide member is sectional drawing) of a waveguide type single core bidirectional communication module. It is a top view (only an optical waveguide member is sectional drawing) of an optical waveguide member and an optical waveguide stand. It is explanatory drawing regarding an optical waveguide. It is explanatory drawing which forms an incident / exit end surface diagonally. It is explanatory drawing which forms a taper in an incident end surface and an output end surface. It is a top view which shows the example which mounted the transceiver of the resin package. It is a perspective view which shows the other example of the waveguide type single core bidirectional | two-way communication module of this invention. It is a disassembled perspective view of the waveguide type single core bidirectional communication module of FIG. It is a perspective view of the waveguide type single core bidirectional communication module of FIG. It is a perspective view of the conventional single-core bidirectional communication module.

Explanation of symbols

DESCRIPTION OF SYMBOLS 21 Optical connector 22 Optical fiber 23 Optical connector plug 24 Optical connector receptacle 25 Ferrule 26 Housing 27 Spring cap 28 Locking arm 29 Locking part 30 Locking projection part 31 Through-hole 32 Connector housing part 33 Housing 34 Both waveguide type single cores Communication module 35 Transmitter circuit section 36 Receiver circuit section 37 Housing body 38 Cover 39 Fitting space 40 Locking section 41 Module storage section 42 Circuit mounting section 43 Substrate connection section 44 Locking section 45 Connection section 46 Locking Projection 47 Light-Emitting Element 48 Light-Receiving Element 49 Optical Waveguide 50 Optical Waveguide Member 51 Housing Concavity 52 Optical Waveguide Base 53 Optical Filter 54 Common Path 55 Light-Emitting Side Path 56 Light-Receiving Side Path 57 Incident End Face 59 Entrance End Face 60 , 61 Member end 62 Element arrangement part 63 Optical fiber side connection 64, 65 Taper 66 Resin package transmitter 67 Resin package receiver 71 Waveguide type single-core bidirectional communication module 72 Optical waveguide 73 Optical waveguide member 74 Optical waveguide base 75 Light emitting side path 76 Light reception Side path 77 incident / exit end face 78 incident end face 79 exit end face 80, 81 member end part 82 base body 83 substrate fixing part 84 housing recess 85 element placement part 86 optical fiber side connection part 87 slit 88 screw hole 89 lead frame

Claims (5)

A light-emitting element and a light-receiving element, an optical waveguide member having an optical waveguide, and an optical waveguide base having an accommodating recess for accommodating the optical waveguide member,
The optical waveguide has a path branched into a light emitting side and a light receiving side, an incident end face facing the light emitting element, an emitting end face facing the light receiving element, and an incident / exit end face facing the end face of the optical fiber. And
The optical waveguide member is configured such that the incident end face and the emission end face of the optical waveguide are arranged on one member end side, and the incident / exit end face is arranged on the other member end side,
The optical waveguide base has an element arrangement part for arranging the light emitting element and the light receiving element side by side and an optical fiber side connection part on the optical fiber side so as to be continuous with the housing recess. ,
The waveguide recess has a fixing structure for fixing the optical waveguide member in accordance with the positions of the light emitting element, the light receiving element, and the optical fiber. In the waveguide type single core bidirectional communication module according to claim 1,
A waveguide-type single-core bidirectional communication module characterized in that an optical filter for removing noise light is provided in the middle of the path on the light receiving side or on the exit end face, or the entrance / exit end face is formed obliquely. In the waveguide type single core bidirectional communication module according to claim 1 or 2,
The waveguide type single core bidirectional communication module, wherein the light receiving side path is formed thicker than the light emitting side path. In the waveguide type single core bidirectional communication module according to claim 1 or 2,
The waveguide type single-core bidirectional communication module, wherein the light receiving side path is formed linearly, and the light emitting side path and the light receiving side path are formed asymmetrically. In the waveguide type single core bidirectional communication module according to any one of claims 1 to 4,
A waveguide-type single-core bidirectional communication module, wherein the width of the incident end face is formed wider than the width of the path on the light emitting side.

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