JP4911026B2 - Optical transmission assembly - Google Patents

Description

  The present invention relates to an optical transmission assembly that reduces electromagnetic noise between transmission and reception.

  A light-emitting element and a light-receiving element are surface-mounted on an upper surface or a lower surface of an optical wiring substrate in which a core is wired in a clad to constitute an optical transmission assembly. By forming a reflecting surface on a part of the core, the light emitting element or the light receiving element and the optical axis in the longitudinal direction of the core can be optically coupled.

  A conventional optical transmission assembly of this type is designed to multiplex and transmit a transmission optical signal and a reception optical signal to a common core connected to an input / output port. For example, in the optical transmission assembly 51 shown in FIGS. 5 and 6, the light emitting element 53 and the light receiving element 54 are surface-mounted on the upper surface of the clad 52. A passing core 55 is wired. The reflection surface 56 is formed by forming a groove in an inverted V shape from the lower surface of the clad 52 to the core 55, so that the core 55 and a member having a lower refractive index than the core 55 (air in this case) are interposed via the groove slope. It comes to touch.

  The core 55 on the light emitting element 53 side and the core 55 on the light receiving element 54 side intersect with each other at a predetermined angle when viewed from above, and the intersection extends from the upper surface of the cladding 52 to the core 55 at a predetermined angle with respect to the core 55 when viewed from above. A square groove 57 is formed by dicing so that the wavelength filter 58 is inserted into the square groove 57. The transmission optical signal and the reception optical signal can be combined (separated) according to the angle formed by each core 55 and the wavelength filter 58. The opposite optical transmission assembly (not shown) has the same structure, and only the mode of the wavelength filter 58 is different in both optical transmission assemblies.

  For example, in the illustrated one-side optical transmission assembly 51, in order to transmit light having a wavelength of 1.5 μm and receive light having a wavelength of 1.3 μm, the light having a wavelength of 1.3 μm is reflected and light having a wavelength of 1.5 μm is reflected. A transmitting wavelength filter 58 is installed, and an optical transmission assembly on the opposite side (not shown) reflects light having a wavelength of 1.5 μm to transmit light having a wavelength of 1.3 μm and receives light having a wavelength of 1.5 μm. A wavelength filter that transmits light of 3 μm is installed. Thereby, in the optical transmission assemblies on both sides, the optical signal transmitted by itself is transmitted to the other party through the wavelength filter provided on itself, and the optical signal transmitted by the other party is provided on itself. The light is reflected by the wavelength filter, branched, and received. In this way, bidirectional transmission / reception can be performed at a common input / output port.

JP 2005-91460 A JP 2003-139799 A

  Incidentally, in the optical transmission assembly 51 of FIG. 5, both the light emitting element 53 and the light receiving element 54 are surface-mounted on the upper surface of the clad 52. A driver 58 for driving the light emitting element 53 and a preamplifier 59 for amplifying the light reception signal of the light receiving element 54 are also surface-mounted on the upper surface of the clad.

  While the drive current of the light emitting element 53 is about several tens of mA, the reception signal of the light receiving element 54 is about several μA, and the light reception signal has a current that is three orders of magnitude smaller than the drive current. For this reason, electromagnetic noise from the driver 58 adversely affects the operation of the preamplifier 59. That is, if a pre-amplifier 59 attempts to amplify a weak received signal with a gain of several hundred to several tens of thousands, the electromagnetic noise component is amplified in the same manner, and the signal-to-noise ratio is deteriorated.

  The simplest and known method for avoiding electromagnetic noise is to increase the distance between the driver and the preamplifier. However, when aiming at miniaturization and integration of the optical transmission assembly, it is desirable to avoid increasing the distance between the light emitting element and the light receiving element.

  Accordingly, an object of the present invention is to provide an optical transmission assembly that solves the above-described problems and reduces electromagnetic noise between transmission and reception.

In order to achieve the above object, according to the present invention, a first optical wiring board having a core wired in a clad is formed, and a second optical wiring board having a core wired in another cladding is formed. The second optical wiring board is overlapped on the upper surface of the wiring board and at least a part thereof is bonded and fixed, and the core longitudinal direction of both ends of the first optical wiring board in the core longitudinal direction from both ends of the core longitudinal direction of the second optical wiring board The first light receiving element is mounted on the upper surface of the protruding part at one end of the first optical wiring board, and the first light is provided at one end of the first optical wiring board directly below the first light receiving element. A first reflecting surface for reflecting an optical signal transmitted through the core of the wiring board to be incident on the first light receiving element is formed, and the first light emitting element is formed on the upper surface of the protruding portion on the opposite end of the first optical wiring board. Mounted on the opposite end of the first optical wiring board, directly below the first light emitting element, the first A second reflecting surface is formed to reflect an optical signal emitted from the light emitting surface of the light emitting element and enter the one end direction of the core of the first optical wiring board, and the second light emission is formed on the upper surface of one end of the second optical wiring board. An element is mounted, and at one end of the second optical wiring board, an optical signal emitted from the light emitting surface of the second light emitting element is reflected immediately below the second light emitting element to oppose the core of the second optical wiring board. A third reflecting surface is formed for incidence in a direction, a second light receiving element is mounted on the upper surface of the second optical wiring board opposite to the second optical wiring board, and the second light receiving element is disposed immediately below the second light receiving element on the opposite end of the second optical wiring board. A fourth reflecting surface is formed for reflecting the optical signal transmitted through the core of the second optical wiring board and entering the second light receiving element, and the first light receiving element and the first light emitting element are covered with a filler. In addition, the filler is provided with an electromagnetic shielding plate .

An electric wiring that extends in the longitudinal direction of the core and forms an electric transmission path in parallel with the optical transmission path by the core may be provided on either or either one of the first optical wiring board and the second optical wiring board.

According to the present invention, a first optical wiring board having a core wired in a clad is formed, a second optical wiring board having a core wired in another cladding is formed, and an upper surface of the first optical wiring board is formed. The second optical wiring board is overlapped and at least a part thereof is bonded and fixed, and the protruding portion that protrudes in the core longitudinal direction from the core longitudinal direction one end portion of the second optical wiring board in the core longitudinal direction one end portion of the first optical wiring board There is formed, is the first light receiving element (or the first light emitting element) is mounted on the protrusion upper surface of one end of the first optical wiring board, the one end of the first optical wiring substrate, the first light receiving element (or the first The light signal transmitted through the core of the first optical wiring board is reflected immediately below ( one light emitting element) and is incident on the first light receiving element (or emitted from the light emitting surface of the first light emitting element). The reflected optical signal is reflected and incident on the opposite end of the core of the first optical wiring board. Because of) the first reflecting surface is formed, is a second light emitting element (or the second light receiving element) is mounted at one end on surfaces of the second optical wiring board, the one end of the second optical wiring board, said first The light signal emitted from the light emitting surface of the second light emitting element is reflected directly below the two light emitting elements (or the second light receiving element) and is incident on the opposite end direction of the core of the second optical wiring board ( Alternatively, a second reflection surface (for reflecting an optical signal transmitted through the core of the second optical wiring board and entering the second light receiving element) is formed, and the first optical wiring board and the second optical wiring board are formed. A connector that can be fitted with a tape optical fiber connector is attached to the opposite end of the first light receiving element, the first light receiving element (or the first light emitting element) is covered with a filler, and an electromagnetic shielding plate is provided on the filler. Is.

  The present invention exhibits the following excellent effects.

  (1) Electromagnetic noise between transmission and reception can be reduced.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

  As shown in FIG. 1, the optical transmission assembly 1 according to the present invention includes a first optical wiring board 4 and a second optical wiring board 7. The first optical wiring substrate 4 has a core 3 wired in a clad 2. Similarly, the second optical wiring board 7 has a core 6 wired in a clad 5 different from the first optical wiring board 4. The second optical wiring board 7 is overlaid on the upper surface of the first optical wiring board 4 and is fixed by using an adhesive.

  Here, the first optical wiring board 4 has a longer length in the core longitudinal direction than the second optical wiring board 7. As a result, a protruding portion 8 a protruding in the core longitudinal direction from the core longitudinal direction one end portion of the second optical wiring substrate 7 is formed at one end portion (left end in the drawing) of the first optical wiring substrate 4. Further, a protruding portion 8 a that protrudes in the core longitudinal direction from the opposite end portion of the second optical wiring substrate 7 in the core longitudinal direction is formed at the opposite end portion (right end in the drawing) of the first optical wiring substrate 4.

  In the first optical wiring substrate 4, the first light receiving element 9 is mounted on the upper surface of the protruding portion 8 a at one end of the first optical wiring substrate 4, and the first light emission is performed on the upper surface of the protruding portion 8 b at the opposite end of the first optical wiring substrate 4. Element 10 is mounted.

  On the other hand, in the second optical wiring substrate 7, the second light emitting element 11 is mounted on the upper surface of one end of the second optical wiring substrate 7, and the second light receiving element 12 is mounted on the upper surface of the opposite end of the second optical wiring substrate 7. Is done.

  The first and second light receiving elements 9 and 12 are, for example, photodiodes, and the first and second light emitting elements 10 and 11 are, for example, VCSEL (surface emitting type) laser diodes (LD). The light receiving elements 9 and 12 and the light emitting elements 10 and 11 have a light receiving surface or a light emitting surface formed on the lower surface of the element package and electrical terminals provided on the lower surface. Implemented.

  As shown in the figure, the first light receiving element 9 mounted on the upper surface of the protruding portion 8 a at one end of the first optical wiring board 4 and the first light emission mounted on the upper surface of the protruding portion 8 b of the opposite end of the first optical wiring substrate 4. The optical signal is exchanged with the element 10 via the core 3. Similarly, the second light emitting element 11 mounted on the upper surface of one end of the second optical wiring substrate 7 and the second light receiving element 12 mounted on the upper surface of the opposite end of the second optical wiring substrate 7 are connected via the core 6. Exchange optical signals.

  Reflective surfaces 13a, 13b, 13c, and 13d are formed in the cores 3 and 6 of the optical wiring boards 4 and 7, respectively. That is, in the first optical wiring board 4, the light emitted from the light emitting surface of the first light emitting element 10 immediately below the first light emitting element 10 mounted on the upper surface of the protruding portion 8 b at the opposite end of the first optical wiring board 4. A reflection surface 13a is formed for reflecting the signal to enter the one end direction of the core 3.

  In addition, an optical signal transmitted through the core 3 is reflected and incident on the first light receiving element 9 immediately below the first light receiving element 9 mounted on the upper surface of the protruding portion 8 a at one end of the first optical wiring board 4. The reflection surface 13b is formed.

  Further, the second optical wiring board 7 reflects the optical signal emitted from the light emitting surface of the second light emitting element 11 directly below the second light emitting element 11 mounted on the upper surface of one end of the second optical wiring board 7. A reflective surface 13c for entering in the opposite end direction of the core 6 is formed.

  Further, a reflection surface for reflecting an optical signal transmitted through the core 6 and making it incident on the second light receiving element 12 immediately below the second light receiving element 12 mounted on the upper surface of the opposite end of the second optical wiring board 7. 13d is formed. Each reflective surface 13a, 13b, 13c, 13d is formed by dicing or drilling an inverted V-shaped groove.

  Thus, in the optical transmission assembly 1 of the present invention, the optical transmission path is a two-layer wiring, and the optical transmission path provided by the lower first optical wiring board 4 is dedicated to the optical transmission from the opposite end to the upper end. The optical transmission line provided by the second optical wiring board 7 is dedicated to optical transmission from one end to the opposite end.

  Here, focusing on the broken circle shown at one end, as shown in FIG. 2, the one end of the first optical wiring board 4 in the core longitudinal direction protrudes beyond the one end of the second optical wiring board 7 in the core longitudinal direction. A portion 8a is formed. On the upper surface of the protruding portion 8a, one set is composed of the first light receiving element 9 and the preamplifier 14 that amplifies the light reception signal of the first light receiving element 9, and two sets are mounted. The number of first light receiving elements 9 and preamplifiers 14 mounted on the first optical wiring board 4 is one or more. Furthermore, a second light emitting element 11 and a driver 15 for driving the second light emitting element 11 are mounted on the upper surface of one end of the second optical wiring board 7. The number of the second light emitting elements 11 and the drivers 15 mounted on the second optical wiring board 7 is one or a plurality.

  Electrical wirings 16 are provided on the upper surface of the first optical wiring substrate 4 and the upper surface of the second optical wiring substrate 7. The electrical wiring 16 is a signal line for transmitting electrical communication signals between a host communication device (not shown) and the preamplifier 14 and the driver 15, a signal line between the first light receiving element 9 and the preamplifier 14, and the driver 15 and the second light emitting element 11. Signal lines between them, power / ground lines, etc. The electrical wiring 16 may be a signal line or a power / ground line extending between one end and the opposite end of the optical transmission assembly 1.

  In the present embodiment, electromagnetic shielding plates 17 are provided above the first light receiving element 9 and the first light emitting element 10 at a height equal to or lower than the upper surface of the second optical wiring board 7. Here, the electromagnetic shielding plate 17 is formed of a metal plate.

  Furthermore, in this embodiment, the filler 18 is filled in the space above the protrusions 8a and 8b. That is, the filler 18 covers the first light receiving element 9 and the first light emitting element 10 and is filled up to a height equal to or lower than the upper surface of the second optical wiring board 7. Then, the electromagnetic shielding plate 17 is bonded and fixed on the filler 18 with an adhesive.

  Next, the operation of the optical transmission assembly 1 will be described.

  As shown in FIG. 1, the optical signal emitted from the first light emitting element 10 mounted on the upper surface of the protruding portion 8b at the opposite end (right end in the figure) of the first optical wiring board 4 is the thickness direction of the cladding 2 ( Downward), reflected by the reflecting surface 13a, and transmitted through the core 3 in one direction. At one end (the left end in the figure) of the first optical wiring board 4, the optical signal transmitted through the core 3 from the opposite end is reflected by the reflecting surface 13b and transmitted in the thickness direction (upward) of the clad 2, and the first light receiving Incident on the element 9.

  On the other hand, the optical signal emitted from the second light emitting element 11 mounted on the upper surface of one end (the left end in the drawing) of the second optical wiring board 7 is transmitted in the thickness direction (downward) of the cladding 5 and reflected by the reflecting surface 13c. And transmitted through the core 6 in the opposite end direction. At the opposite end (right end in the figure) of the second optical wiring board 7, the optical signal transmitted through the core 6 from one end is reflected by the reflecting surface 13d and transmitted in the thickness direction (upward) of the clad 5, and the second light receiving Incident on the element 12.

  At this time, as shown in FIG. 2, the second light emitting element 11 is driven by the driving current from the driver 15, and the light receiving current of the first light receiving element 9 is amplified by the preamplifier 14. The first light receiving element 9 and the preamplifier 14 are mounted on the upper surface of the protruding portion 8a of the first optical wiring board 4, and the second light emitting element 11 and the driver 15 are connected to the second light from the upper surface of the protruding portion 8a of the first optical wiring board 4. The first light receiving element 9 and the preamplifier 14 are not easily affected by the electromagnetic noise radiated from the driver 15 because it is mounted on the upper surface of the second optical wiring board 7 that is higher than the thickness of the wiring board 7.

  Conventionally, electromagnetic noise from the driver has an adverse effect on the operation of the preamplifier, so it has been difficult to reduce the distance between the driver and the preamplifier and reduce the size and integration of the optical transmission assembly. However, according to the present invention, since the driver 15 is mounted on the upper surface of the second optical wiring board 7 and the preamplifier 14 is mounted on the upper surface of the protruding portion 8a of the first optical wiring board 4, the vertical direction (height direction) ). With this structure, the distance between the driver 15 and the preamplifier 14 is longer than when they are arranged on the same plane, and the influence of electromagnetic noise is reduced. Therefore, the optical transmission assembly can be reduced in size and integrated by reducing the distance on the plane between the driver 15 and the preamplifier 14 without increasing the influence of electromagnetic noise.

  Further, when the electromagnetic shielding plate 17 is provided, the electromagnetic shielding plate 17 shields the electromagnetic noise radiated by the driver 15 from the preamplifier 14, so that the electromagnetic noise between transmission and reception can be further reduced.

  Conventionally, when transmitting optical signals having different optical wavelengths with a single core, a wavelength filter is required to multiplex / demultiplex the optical signals. However, in the present invention, since the cores 3 and 6 are separated into two upper and lower layers as optical transmission lines, there is no need to provide a wavelength filter as in the prior art, and therefore a groove for inserting the wavelength filter is formed by dicing. There is no need.

  Next, a method for manufacturing the optical transmission assembly 1 of the present invention will be described.

  A core film is formed by spin coating or the like on the upper surface of the base material that becomes the lower clad of the first optical wiring board 4. The core 3 is formed by transferring the optical circuit pattern (core pattern) onto the core film. Alternatively, the core film is exposed to a photomask having an optical circuit pattern on the core film, the core film is exposed, and the core film other than the core masked with the photomask is removed with a solvent or the like, thereby forming the core 3. Thereafter, the core 3 is formed in the clad 2 by applying an upper clad. A groove is formed by dicing from the lower clad side, and the surface of the groove is used as the reflecting surface 13. The process for forming the reflecting surface 13 is not limited to this. Thereby, the 1st optical wiring board 4 is manufactured. The method for forming the electrical wiring 14 on the first optical wiring board 4 may be the same as that of the prior art. In addition, a conventional method for forming a conductor pattern for surface mounting may be used.

  The second optical wiring board 7 is manufactured in the same manner as the first optical wiring board 4.

  Next, the first optical wiring board 4 and the second optical wiring board 7 are bonded with an adhesive. The first optical wiring board 4 and the second optical wiring board 7 are bonded on the entire surface, but each may be bonded only partially. When a part of each is bonded, wiring is easy because of excellent flexibility. At this time, the length of the core in the core longitudinal direction of the first optical wiring board 4 is made longer than the length of the core of the second optical wiring board 7 in the core longitudinal direction. Both ends of the wiring board 4 in the core longitudinal direction protrude in the core longitudinal direction, and the protruding portions 8a and 8b are formed.

  Next, another embodiment of the present invention will be described.

  As shown in FIG. 3, the optical transmission assembly 31 includes a first optical wiring board 34 and a second optical wiring board 37. The first optical wiring board 34 has a core 33 wired in a clad 32. The second optical wiring board 7 has a core 36 wired in a clad 35 different from the first optical wiring board 34. A second optical wiring board 37 is overlaid on the upper surface of the first optical wiring board 34.

  Here, the first optical wiring board 34 has a longer length in the core longitudinal direction than the second optical wiring board 37. Thus, a protruding portion 38 that protrudes in the core longitudinal direction from the one core longitudinal direction end of the second optical wiring substrate 37 is formed at one end (left end in the drawing) of the first optical wiring substrate 34. On the other hand, the end portion (the right end in the figure) of the first optical wiring board 34 is aligned with the end portion of the second optical wiring board 37 opposite to the core length direction.

  A light receiving element 39 is mounted on the upper surface of the protruding portion 38 that is one end of the first optical wiring board 34. The light emitting element 40 is mounted on the upper surface of one end of the second optical wiring board 37. On the other hand, a connector 42 that can be fitted to the tape optical fiber connector 41 a is attached to opposite ends of the first optical wiring board 34 and the second optical wiring board 37.

  The configuration of the optical transmission assembly 31 can be grasped as an image as if the optical transmission assembly 1 described with reference to FIG. That is, as shown in FIG. 4, the core longitudinal direction one end (left end in FIG. 4) of the first optical wiring board 34 protrudes from the core longitudinal direction one end (left end in FIG. 4) of the second optical wiring substrate 37. A protrusion 38 is formed on the first optical wiring board 34. A light receiving element 39 and a preamplifier 43 that amplifies the light reception signal of the light receiving element 39 are mounted on the upper surface of the protruding portion 38. A light emitting element 40 and a driver 44 for driving the light emitting element 40 are mounted on the upper surface of one end of the second optical wiring board 37.

  Cross sections of the cores 33 and 36 appear at opposite ends of the first optical wiring board 34 and the second optical wiring board 37. The cross section of the core 33 can be considered as an input port, and the cross section of the core 36 can be considered as an output port. An optical transmission assembly 31 is configured by attaching a connector 42 to opposite ends of the first and second optical wiring boards 34 and 37 having these input / output ports.

  As shown in FIG. 3, the connector 42 can be fitted to the double-layer board insertion port that can be attached to the opposite ends of the first optical wiring board 34 and the second optical wiring board 37, and the tape optical fiber connector 41. Connector fitting opening (or projection). On the other hand, the tape optical fiber connector 41 has a connector fitting protrusion (or port) that can be fitted to the connector 42 and a tape optical fiber insertion port in which the tape optical fiber 45 can be inserted in two layers. The tape optical fiber 45 is a parallel arrangement of a plurality of optical fibers having the same clad thickness and clad diameter of the first optical wiring board 34 and the second optical wiring board 37. Since the core width direction arrangement pitch of the plurality of cores 33 and 36 in the first optical wiring board 34 and the second optical wiring board 37 is the same as the optical fiber arrangement pitch in the tape optical fiber 45, The optical fiber core of the tape optical fiber 45 can be optically coupled.

  The tape optical fiber 45 has a tape optical fiber connector 41a fitted to the connector 42 of the optical transmission assembly 31 at one end and a tape optical fiber connector 41b attached to the opposite end.

  A connector of the other optical transmission assembly (not shown) is fitted into the tape optical fiber connector 41b at the opposite end of the tape optical fiber 45. The counterpart optical transmission assembly has a light emitting element mounted on the upper surface of one end of the first optical wiring board and a light receiving element on the upper surface of one end of the second optical wiring board in a complementary manner to the optical transmission assembly 31 of FIGS. 1 corresponds to the opposite end side of the optical transmission assembly 1 of FIG. 1 cut in the middle of the longitudinal direction. By connecting the optical transmission assembly 31 and the counterpart optical transmission assembly via the tape optical fiber 45 in this manner, the optical transmission path is formed in a two-layer wiring, as in the case of using the optical transmission assembly 1 of FIG. Thus, the optical transmission path provided by the lower first optical wiring board 4 is dedicated to optical transmission from the opposite end to one end, and the optical transmission path provided by the upper second optical wiring board 7 is provided from one end to the opposite end. It can be dedicated to optical transmission. The optical transmission assembly 31 and the counterpart optical transmission assembly may be connected by a connector without using the tape optical fiber 45.

  According to the optical transmission assembly 31, the driver 44 is mounted on the upper surface of the second optical wiring board 47 and the preamplifier 43 is mounted on the upper surface of the protruding portion 8 of the first optical wiring board 44. Separately arranged in the vertical direction (height direction). Therefore, the distance between the driver 44 and the preamplifier 43 is longer than when they are arranged on the same plane, and the influence of electromagnetic noise is reduced. Therefore, the optical transmission assembly can be reduced in size and integrated by reducing the planar distance between the driver 44 and the preamplifier 43 without increasing the influence of electromagnetic noise.

  Also in the optical transmission assembly 31, the electromagnetic noise can be further reduced by providing the filler 46 and the electromagnetic shielding plate 47.

  According to the optical transmission assembly 31, by combining with the counterpart optical transmission assembly, it is possible to obtain a configuration equivalent to that in which the tape optical fiber 45 is inserted in the middle of the optical transmission assembly 1 of FIG. The transmission distance can be freely set by adjusting the length of the tape optical fiber 45.

  The optical transmission assemblies 1 and 31 of the present invention can be installed between a higher-level communication device and another communication device, and can be used for optical transmission of communication signals between the two communication devices. Further, the optical transmission assemblies 1 and 31 of the present invention can be installed in an electronic device and used for optical transmission of communication signals between a certain electronic circuit and another electronic circuit. For example, the optical transmission assembly 31 is mounted on one electronic circuit board, the mating optical transmission assembly is mounted on the other electronic circuit board, and the optical fiber assembly 45 and the mating optical transmission assembly are connected to the tape optical fiber 45. Connect through. Thereby, optical communication between electronic circuit boards becomes possible.

  Further, the optical transmission assemblies 1 and 31 may be provided with electrical wiring extending in the longitudinal direction of the core so that the electrical transmission path is configured in parallel with the optical transmission path by the core. The electrical wiring is used for low-speed signal transmission and power supply. The optical transmission line is preferably used for high-speed signal transmission.

1 is a longitudinal cross-sectional view of an optical transmission assembly illustrating one embodiment of the present invention. FIG. 2 is a perspective view of the optical transmission assembly of FIG. 1. FIG. 6 is a longitudinal cross-sectional view of an optical transmission assembly showing another embodiment of the present invention. FIG. 4 is a perspective view of the optical transmission assembly of FIG. 3. It is a perspective view of the conventional optical transmission assembly. 1 is a longitudinal sectional view of a conventional optical transmission assembly.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Optical transmission assembly 2 Clad 3 Core 4 1st optical wiring board 5 Clad 6 Core 7 2nd optical wiring board 8a, 8b Protrusion part 9 1st light receiving element 10 1st light emitting element 11 2nd light emitting element 12 2nd light receiving element 13a , 13b, 13c, 13d Reflecting surface 14 Preamplifier 15 Driver 16 Electrical wiring 17 Electromagnetic shielding plate 18 Filler

Claims (3)

A first optical wiring board having a core wired in the cladding is formed;
A second optical wiring substrate having a core wired in another cladding is formed,
The second optical wiring board is overlapped on the upper surface of the first optical wiring board and at least a part thereof is bonded and fixed, and the both ends of the first optical wiring board in the longitudinal direction of the core are connected to both ends of the second optical wiring board in the longitudinal direction of the core. A protrusion protruding in the longitudinal direction of the core is formed,
A first light receiving element is mounted on the upper surface of the protruding portion at one end of the first optical wiring board,
A first reflecting surface for reflecting an optical signal transmitted through the core of the first optical wiring board and making it incident on the first light receiving element is provided at one end of the first optical wiring board immediately below the first light receiving element. Formed,
The first light emitting element is mounted on the upper surface of the protruding portion at the opposite end of the first optical wiring board,
An optical signal emitted from the light emitting surface of the first light emitting element is reflected at the opposite end of the first optical wiring board and incident on one end of the core of the first optical wiring board just below the first light emitting element. A second reflecting surface is formed,
A second light emitting element is mounted on the upper surface of one end of the second optical wiring board;
An optical signal emitted from the light emitting surface of the second light emitting element is reflected at one end of the second optical wiring board directly below the second light emitting element and is incident on the opposite end of the core of the second optical wiring board. A third reflecting surface is formed,
A second light receiving element is mounted on the upper surface of the opposite end of the second optical wiring board;
At the opposite end of the second optical wiring board, a fourth reflecting surface for reflecting an optical signal transmitted through the core of the second optical wiring board and making it incident on the second light receiving element immediately below the second light receiving element. Formed,
An optical transmission assembly, wherein the first light receiving element and the first light emitting element are covered with a filler, and an electromagnetic shielding plate is provided on the filler.   The first optical wiring board and / or the second optical wiring board is provided with an electrical wiring that extends in the longitudinal direction of the core and configures the electrical transmission path in parallel with the optical transmission path by the core. The optical transmission assembly of claim 1. A first optical wiring board having a core wired in the cladding is formed;
A second optical wiring substrate having a core wired in another cladding is formed,
The second optical wiring board is overlaid on the upper surface of the first optical wiring board, and at least a part thereof is bonded and fixed. From one end of the first optical wiring board in the core longitudinal direction, A protrusion protruding in the longitudinal direction of the core is formed,
A first light receiving element (or a first light emitting element) is mounted on the upper surface of the protruding portion at one end of the first optical wiring board,
The one end of the first optical wiring board, the right under the first light receiving element (or the first light emitting element), the reflected light signal transmitted the core of the first optical wiring substrate and the first light receiving element A first reflection surface is formed (or for reflecting an optical signal emitted from the light emitting surface of the first light emitting element and making it incident in the direction opposite to the core of the first optical wiring board). ,
The second light emitting element (or the second light receiving element) is mounted on one end on surfaces of the second optical wiring board,
The one end of the second optical wiring board, the right under the second light emitting element (or the second light receiving element), the second optical wiring board to reflect light emitted signals from the light emitting surface of the second light emitting element A second reflection surface is formed for making it incident in the opposite end direction of the core (or for reflecting the optical signal transmitted through the core of the second optical wiring board and making it incident on the second light receiving element). ,
A connector that can be fitted with a tape optical fiber connector is attached to opposite ends of the first optical wiring board and the second optical wiring board,
An optical transmission assembly, wherein the first light receiving element (or the first light emitting element) is covered with a filler, and an electromagnetic shielding plate is provided on the filler.

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