JPH05333251A - Optical array module and optical array link - Google Patents

Abstract

(57) [Abstract] [Object] To prevent crosstalk from occurring in an optical array module and an optical array link in which a light emitting element array and an optical fiber array are optically coupled or an optical fiber array and a light receiving element array are optically coupled. To aim. [Structure] In a module in which an optical fiber array 40 and a light receiving element array 50 are arranged so as to face each other, and a light receiving element 55 facing each optical fiber 45 is optically coupled, the substrate 41 of the optical fiber array 40 is emitted. A wedge-shaped protrusion 46 is provided on one of the intermediate portion of each of the optical fibers 45 on the side end surface 43 or each intermediate portion of each of the light-receiving elements 55 on the incident-side end surface of the light-receiving element array 50, and the wedge-shaped protrusion is provided on the other. A wedge-shaped concave portion 56 that fits into 46 is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical array module and an optical array link in which a light emitting element array and an optical fiber array are optically coupled, or an optical fiber array and a light receiving element array are optically coupled.

With the increase in speed of electronic devices and the simplification of circuits,
An optical array link including a light emitting element array, an optical fiber array, and a light receiving element array tends to be used as a transmission circuit of electronic equipment.

Such an optical array module is required to have no crosstalk in another adjacent optical transmission line.

[0004]

2. Description of the Related Art FIGS. 6A and 6B are views of a conventional example, in which FIG. 6A is a perspective view and FIG. In FIG. 6, reference numeral 10 denotes a light emitting element array in which a plurality of light emitting elements 15 for converting an electric signal into an optical signal are arranged in a horizontal row, and the light emitting end face (vertical surface in the figure) emits light at an equal pitch. Part 11 is arranged.

Reference numeral 20 denotes a circuit board made of ceramics or the like having a drive circuit provided on the surface thereof, and a light emitting element array on the surface.
Lead patterns 21 are formed in parallel on the 10 side so as to correspond to the electrodes 12 of the respective light emitting elements 15.

Reference numeral 2 is a square plate-shaped carrier having a ground electrode 13 provided on the surface thereof. The carrier 2 is mounted on the base 1, so that the lead pattern 21 and the electrode 12 are located on a straight line.
The light emitting element array 10 and the circuit board 20 are mounted on the carrier 2 by soldering or the like.

The lead pattern corresponding to the electrode 12
21 is connected to a connecting wire 22 such as a gold wire. On the other hand, 30 is
V-grooves 32 are provided in parallel on the upper surface of the substrate 31 at a pitch equal to the parallel pitch of the emitting portions 11, and the optical fibers are provided in the respective V-grooves 32.
It is an optical fiber array in which 35 is inserted and fixed.

Then, the incident side end face 33 has the light emitting element array 10
Optical fiber array so that it closely faces the output surface of the
After mounting the 30 on the base 1 and adjusting the optical axes of the respective optical fibers 35 so as to match the optical axes of the emitting portions 11 of the corresponding light emitting elements 15, the back surface of the substrate 31 is soldered to the base 1. Etc. are used to fix and form an optical array module.

[0009]

However, the light beam emitted from the light emitting element spreads in a substantially elliptical cone shape and is projected on the incident side end surface of the optical fiber array.

Therefore, as shown by the dotted line in FIG. 6B, a part of the light emitted from the light emitting element is reflected by the end face on the incident side and projected on the end face on the emitting side of the light emitting element, and is emitted on the end face on the emitting side. Further, there is a problem that so-called crosstalk occurs because the light is reflected and leaks into an adjacent optical fiber to enter.

On the other hand, although not shown in the drawing, similarly, between the optical fiber array and the light receiving element array, there is a problem that light emitted from the optical fiber leaks into an adjacent light receiving element and is incident to cause crosstalk.

The present invention has been made in view of the above circumstances, and crosstalk occurs in an optical array module including a light emitting element array and an optical fiber array, and an optical array module including an optical fiber array and a light receiving element array. An object of the present invention is to provide an optical array module and an optical array link that are free from the risk of

[0013]

In order to achieve the above-mentioned object, according to the present invention, as shown in FIG. 1, an optical fiber array 40 and a light receiving element array 50 are arranged so as to face each other, and the optical fibers 45 and In a module configured to optically couple with a light receiving element 55 facing each other, light is received at an intermediate portion of each of the optical fibers 45 of the output side end surface 43 of the substrate 41 of the optical fiber array 40 or the incident side end surface of the light receiving element array 50. A wedge-shaped protrusion 46 is provided on either one of the intermediate portions of the element 55, and a wedge-shaped recess 56 that fits into the wedge-shaped protrusion 46 is provided on the other.

As illustrated in FIG. 2, the light emitting element array 10
And the optical fiber array 30 are arranged so as to face each other, and in the module configured to optically couple the respective light emitting elements 15 and the facing optical fibers 35, in the middle of each of the light emitting elements 15 on the emission side end face of the light emitting element array 10. Or a middle portion of each of the optical fibers 35 on the incident side end face 33 of the substrate 31 of the optical fiber array 30 is provided with a wedge-shaped protrusion 36, and the other is provided with a wedge-shaped recess that fits into the wedge-shaped protrusion 36. 16 is provided.

As illustrated in FIG. 3, an optical fiber array
40 and the light receiving element array 50 are arranged so as to face each other, and in a module configured to optically couple the respective light receiving elements 55 with the respective optical fibers 45, an optical fiber is formed with the emission end face of each optical fiber 45 as an axis. A light-receiving element array with the conical trapezoidal projections 48 formed in parallel on the emission end face side of the substrate 41 of the array 40 and the incident surfaces of the respective light-receiving elements 55 as axes.
The truncated cone-shaped protrusions 58 formed in parallel on the incident end face side of 50 and the holes 71 in which the light shielding film P is formed on the inner wall are arranged at a pitch equal to the parallel pitch of the optical fibers 45, and the optical fiber array 40 and the light receiving element are arranged. The block 70 interposed between the arrays 50 is provided, the frustoconical projection 48 of the optical fiber array 40 is fitted into one opening of each hole 71, and the light receiving element array 50 is fitted into the other opening. The configuration is such that the truncated cone-shaped protrusion 58 is fitted.

As illustrated in FIG. 5, the light emitting element array 10
And the optical fiber array 30 are arranged so as to face each other, and in the module configured so that the respective light emitting elements 15 and the facing optical fibers 35 are optically coupled, each light emitting element array
An optical fiber array 30 with the conical protrusions 18 formed in parallel on the emitting end face side of the light emitting element array 10 and the incident end faces of the respective optical fibers 35 as the axial center with the emitting part of 10 as the axial center.
Frustoconical protrusions 38 formed in parallel on the incident end face side of the substrate 31 of
And the holes 71 in which the light shielding film P is formed on the inner wall are arranged at a pitch equal to the parallel pitch of the light emitting elements 15, and the light emitting element array 10
And a block 70 interposed between the optical fiber array 30 and the conical trapezoidal projection 18 of the light emitting element array 10 is fitted into one opening of each hole 71 and the optical fiber is fitted into the other opening. The frustoconical projections 38 of the array 30 are fitted together.

Alternatively, although not shown, an optical array in which the optical array module according to claim 2 or 4 is configured on the transmitting side and the optical array module according to claim 1 or 3 is configured on the receiving side. Make it a link.

[0018]

According to the present invention as set forth in claim 1, since the incident surface of each light receiving element and the emitting end surface of the optical fiber closely face each other, the light emitted from the optical fiber is incident on the corresponding light receiving element. To do.

On the other hand, since the wedge-shaped protrusion and the wedge-shaped recess are provided in the intermediate portion of the optical fibers arranged in parallel with the intermediate portion of the light-receiving elements arranged in parallel, and the wedge-shaped protrusion and the wedge-shaped recess are fitted together, The emitted light is blocked from entering another light receiving element which is diagonally opposed. That is, crosstalk does not occur.

According to the second aspect of the present invention as well, since the wedge-shaped protrusion and the wedge-shaped recess are fitted together, the light emitted from the light emitting element is prevented from entering another optical fiber that is obliquely opposed. .. Therefore, crosstalk does not occur.

According to the third aspect of the invention, the emitting end surface of the optical fiber is located at the tip surface of the truncated cone-shaped projection, and the incident surface of the light receiving element is also located at the tip surface of the truncated cone-shaped projection. Then, both of the truncated cone-shaped projections are closely faced and optically coupled in the hole of the block.

Therefore, of the light emitted from the optical fiber, the light that has spread to the periphery is prevented from expanding further by the light shielding film of the hole. That is, crosstalk does not occur.

Also in the fourth aspect of the invention, similarly, the emitting portion of the light emitting element and the incident end face of the optical fiber closely face and oppose each other in the hole of the block. Therefore, crosstalk does not occur.

[0024]

The present invention will be described in detail with reference to the drawings. The same reference numerals denote the same objects throughout the drawings.

FIG. 1 is a perspective view showing the invention of claim 1 in a separated form, FIG. 2 is a plan view of an embodiment of the invention of claim 2, and FIG.
Is a diagram of an embodiment of the invention of claim 3, (A) is a partially cutaway plan view, (B) is a sectional view, FIG. 4 is a perspective view of a block, and FIG. 5 is a partially broken view of the invention of claim 4. It is a top view.

In FIG. 1, reference numeral 50 denotes a light emitting element array in which a plurality of light receiving elements 55 for converting an optical signal into an electric signal are arranged side by side in a row, and the incident side end surface (vertical surface in the figure) of
Circular incident surfaces 51 are arranged at equal pitches.

A wedge-shaped recess 56 having a V-shape in plan view is provided in the intermediate portion of each of the light-receiving elements 55 on the incident side end surface of the light-receiving element array 50. Reference numeral 60 is a circuit board made of ceramics or the like having an amplification circuit 65 on the surface thereof. A ground electrode 63 is provided on one vertical surface, and the light receiving element array 50 is soldered on the ground electrode 63 so that the optical axis becomes horizontal. It is mounted by attaching.

Lead patterns 61 are formed in parallel on the surface of the circuit board 60 on the side of the light receiving element array 50 corresponding to the electrodes 52 of the respective light receiving elements 55, and the electrodes 52 and the corresponding lead patterns 61 are formed by gold wires. Etc. are connected by a connecting line 62.

Reference numeral 40 denotes an optical fiber in which V grooves 42 are provided in parallel on the upper surface of the substrate 41 at a pitch equal to the parallel pitch of the incident surfaces 51 of the light receiving element array 50, and an optical fiber 45 is inserted and fixed in each V groove 42. It is an array.

Emitting-side end surface of the substrate 41 of the optical fiber array 40
In the optical fiber 43, a wedge-shaped protrusion 46 that fits into the wedge-shaped recess 56 of the light-receiving element array 50 is provided in each intermediate portion of the optical fiber 45.

After mounting the circuit board 60 on the base 5, the wedge-shaped recess 46 of the light receiving element array 50 is fitted with the wedge-shaped projection 46 to mount the optical fiber array 40 on the base 5 to form an optical array module.

As described above, since the wedge-shaped protrusion 46 and the wedge-shaped recess 56 are fitted properly, the optical fibers corresponding to the optical axes of the respective light receiving elements 55 can be obtained without special adjustment work. The optical axis of 45 coincides with high accuracy, and the incident surface 51 and the emitting end surface of the optical fiber 45 closely oppose each other.

Therefore, the optical fiber 45 and the light receiving element 55 are efficiently optically coupled. On the other hand, since the wedge-shaped projections 46 and the wedge-shaped recesses 56 that are fitted to each other are provided at the intermediate portion of the light receiving elements 55 arranged in parallel and the intermediate portion of the optical fiber 45 arranged in parallel, the light emitted from the optical fiber 45 opposes diagonally. It is blocked from entering the other light receiving element 55.

A wedge-shaped recess is provided on the optical fiber array side.
Even if a wedge-shaped protrusion is provided on the light receiving element array side, the same effect can be obtained. In FIG. 2, the light emitting element array 10 in which a plurality of light emitting elements 15 for converting an electric signal into an optical signal are arranged side by side in a row has a light emitting element face 10 (vertical surface in the figure) at the same pitch on the light emitting end face.
11 are arranged.

Light-Emitting Element on Emitting Side of Light-Emitting Element Array 10
Wedge-shaped recesses 16 with inverted trapezoidal plan views
Is provided. Lead patterns 21 are formed in parallel on the light emitting element array 10 side on the surface of a circuit board 20 made of ceramics or the like having a drive circuit 25 provided on the surface thereof so as to correspond to the electrodes 12 of the respective light emitting elements 15.

Then, a square plate-shaped carrier 2 having a ground electrode on the surface is mounted on the base 1, and the light emitting element array 10 is provided on the carrier 2 so that the lead pattern 21 and the electrode 12 are aligned with each other. The circuit board 20 is mounted by soldering or the like.

The lead pattern 21 corresponding to the electrode 12
And a connecting wire 22 such as a gold wire. On the other hand, the V grooves 32 are provided in parallel on the upper surface of the substrate 31 at a pitch equal to the parallel pitch of the emitting portions 11, and the optical fibers 35 are inserted and fixed in the respective V grooves 32 to form the optical fiber array 30.

In this optical fiber array 30, a wedge-shaped protrusion 36 that fits into the above-mentioned wedge-shaped recess 16 is provided at the intermediate portion of each of the optical fibers 35 on the incident side end surface 33 of the substrate 31. Then, the optical fiber array 30 is placed on the base 1 so that the incident side end face 33 closely faces and faces the emission face of the light emitting element array 10, and the respective wedge-shaped protrusions 36 are fitted into the opposed wedge-shaped recesses 16. Then, the back surface of the substrate 31 is bonded to the base 1 with an adhesive or the like to form an optical array module.

As described above, since the wedge-shaped recess 16 and the wedge-shaped protrusion 36 are fitted properly, the optical fiber corresponding to the optical axis of each light emitting element 15 can be obtained without special adjustment work. The optical axes of 35 coincide with each other with high accuracy. Further, the emitting portion 11 and the incident end face of the optical fiber 35 are close to each other.

Therefore, the light emitting element 15 and the optical fiber 35 are efficiently optically coupled. On the other hand, since the wedge-shaped concave portion 16 and the wedge-shaped protrusion 36 which are fitted to each other are provided in the intermediate portion of the arranged light emitting elements 15 and the intermediate portion of the optical fibers 35 arranged in parallel, the light emitting element 15
The outgoing light is blocked from entering another optical fiber 35 that is diagonally opposed.

A wedge-shaped recess is provided on the optical fiber array side.
Even if a wedge-shaped protrusion is provided on the light emitting element array side, the same effect can be obtained. In FIGS. 3 and 4, circular incident surfaces are arranged at equal pitches on the incident-side end surface (vertical surface in the figure) of the light-receiving element array 50 in which a plurality of light-receiving elements 55 are arranged side by side in a row.

On the incident side end surface of the light receiving element array 50,
A frustoconical projection 58 having an incident surface of each light receiving element 55 as an axis is provided. A ground electrode is provided on one vertical surface of a circuit board 60 made of ceramics or the like having an amplifier circuit 65 on the surface, and the light receiving element array 50 is mounted by soldering so that the optical axis becomes horizontal on the ground electrode. is doing.

The light receiving element array on the surface of the circuit board 60
On the side of 50, lead patterns are formed in parallel corresponding to the electrodes 52 of the respective light receiving elements 55, and the electrodes of the light receiving elements 55 and the corresponding lead patterns are connected by connecting lines 62 such as gold wires.

On the other hand, the incident surface of the light receiving element array 50 on the substrate 41
The fine holes 42-2 are provided in parallel at a pitch equal to the parallel pitch of 51, and the optical fibers 45 are inserted and fixed in the respective fine holes 42-2 to form the optical fiber array 40.

A truncated cone-shaped protrusion 48 is provided in parallel with the emission end face side of the substrate 41 with the emission end face of each optical fiber 45 as an axis. Reference numeral 70 is a horizontally elongated rectangular parallelepiped block made of glass. Holes 71 that horizontally penetrate the block 70 are formed in a horizontal row at a pitch equal to the parallel pitch of the light receiving elements 55 of the light receiving element array 50 in the block 70, and metal or the like is vapor-deposited on the inner wall of each hole 71 to block light. Membrane P
Is provided.

The light-shielding film P is preferably black. In addition, as shown in FIG.
A groove 72 is provided on the upper side of this to serve as a relief portion for the above-mentioned wired connection line 62.

Then, as shown in FIG. 3, the circuit board
60 is mounted on the base 5, and the block 70 is placed on the side of the photo detector array 50
Are arranged, the block 70 is pressed against the light receiving element array 50 side, the respective holes 71 are fitted into the truncated cone-shaped projections 58, then the optical fiber array 40 is placed on the base 5, and the blocks 70 are pressed against each other. Block corresponding to the truncated cone-shaped protrusion 48
The optical fiber array 40 is fixed to the base 5 while being fitted in the hole 71 of the 70.

Therefore, the optical axis of each optical fiber 45 and the optical axis of the light receiving element 55 coincide with each other without any adjustment work, and the emission end face and the incident surface of the light receiving element 55 are close to each other in the hole 71. And face each other. Therefore, the light is efficiently coupled.

On the other hand, of the light emitted from the optical fiber, the light that has spread to the periphery is projected and absorbed by the light-shielding film P provided on the inner wall of the hole 71, so that it may be incident on another adjacent light receiving element 55. Be blocked.

In FIG. 5, in the light emitting element array 10 in which the light emitting elements 15 are arranged side by side in a row, the emitting portions 11 are arranged at equal intervals on the emitting end surface (vertical surface in the figure). A frustoconical projection 18 is provided on the emission end face side of the light emitting element array 10 with the emission portion of each light emitting element array 10 as the axis.

On the surface of the circuit board 20 made of ceramics or the like on the surface of which the drive circuit 25 is provided, on the light emitting element array 10 side,
Lead patterns 21 are formed in parallel corresponding to the electrodes 12 of each light emitting element 15.

A square plate-shaped carrier (not shown) having a ground electrode on its surface is mounted on the base 1, and the light emitting element array 10 and the circuit board are mounted on the carrier so that the lead pattern and the electrode are aligned with each other. 20 and so on are mounted by soldering.

Further, the electrodes and the corresponding lead patterns are connected by connecting wires such as gold wires. On the other hand, fine holes 32-2 are formed on the substrate 31 at a pitch equal to the parallel pitch of the emitting portions of the light emitting element 15.
Are installed in parallel, and the optical fiber 35 is
The optical fiber array 30 is made by inserting and fixing.

Then, with the incident end faces of the respective optical fibers 35 as axes, the conical trapezoidal projections 38 are provided in parallel on the incident end face side of the substrate 31. As described above, the block 70 is arranged corresponding to the light emitting element array 10 mounted on the base 1.
The block 70 is pressed toward the light emitting element array 10 side so that the respective holes 71 are fitted into the truncated cone-shaped protrusions 18, and then the optical fiber array 30 is placed on the base 1 and pressed against the block 70, and the respective truncated cone-shaped protrusions 38. The optical fiber array 30 is fixed to the base 1 while being fitted in the holes 71 of the corresponding block 70.

Therefore, the optical axis of the emitting portion of each light emitting element 15 and the optical axis of the optical fiber 35 coincide with each other without performing adjustment work, and the emitting portion and the incident end surface of the optical fiber 35 in the hole 71. And closely face each other. Therefore, the light is efficiently coupled.

On the other hand, of the light emitted from the light emitting element 15, the light that has spread to the periphery is projected and absorbed by the light shielding film P provided on the inner wall of the hole 71, so that it may be incident on another adjacent optical fiber 35. Be blocked.

Although not shown, in the optical array link in which the transmitting side and the receiving side are connected via an optical fiber, the transmitting side is the optical array module shown in FIG. 2 or 5, and the receiving side is the optical array module shown in FIG. By using the optical array module shown in FIG. 3, an optical array link having no crosstalk can be obtained.

[0058]

As described above, according to the present invention, the light emitting element array or the light receiving element array is provided with the wedge-shaped projections or the wedge-shaped recesses, and the optical fiber array is provided with the wedge-shaped recesses or the wedge-shaped projections. It has an excellent effect that there is no crosstalk between the arranged optical transmission lines.

On the other hand, both optical axes coincide with each other with almost no position adjustment, and the optical coupling efficiency is high. Further, the light emitting element array, the light receiving element array, and the optical fiber array are each provided with a truncated cone-shaped projection, and the light emitting element array and the optical fiber array are provided through a block in which a light shielding film is provided on the inner wall of the hole
By combining the optical fiber array and the light receiving element array, there is an excellent effect that there is no crosstalk between the arranged optical transmission lines.

On the other hand, both optical axes coincide with each other without any position adjustment, and the optical coupling efficiency is high.

[Brief description of drawings]

FIG. 1 is a perspective view showing the invention of claim 1 in a separated form.

FIG. 2 is a plan view of an embodiment of the invention of claim 2;

FIG. 3 is a diagram of an embodiment of the invention of claim 3 (A) is a partially cutaway plan view (B) is a sectional view

FIG. 4 is a perspective view of a block

FIG. 5 is a partially cutaway plan view of the invention of claim 4;

FIG. 6 is a view of a conventional example, (A) is a perspective view, and (B) is a plan view of a main part.

[Explanation of symbols]

1,5 Base 2 Carrier 10 Light emitting element array 11 Emitting part 12 Electrode 13 Earth electrode 15 Light emitting element 16,56 Wedge-shaped recess 20,60 Circuit board 21,61 Lead pattern 22,62 Connection line 25 Drive circuit 30,40 Optical fiber Array 31,42 Substrate 32 V-groove 33 Incident end face 35,45 Optical fiber 36,46 Wedge-shaped protrusion 38 Frustum-conical protrusion 50 Photodetector array 51 Incident surface 55 Photodetector 60 Circuit board 65 Amplification circuit 70 Block 71 Hole P Shading film

Claims (5)

[Claims] 1. An optical fiber array (40) and a light receiving element array
(50) is arranged so as to face each other, and in a module configured to optically couple the respective optical fibers (45) and the facing light receiving element (55), the output of the substrate (41) of the optical fiber array (40) One of the intermediate portions of the optical fibers (45) on the side end surface (43) or the intermediate portions of the light receiving elements (55) on the incident side end surface of the light receiving element array (50) is wedge-shaped. An optical array module comprising a protrusion (46) and a wedge-shaped recess (56) fitted to the wedge-shaped protrusion (46) on the other side. 2. A light emitting element array (10) and an optical fiber array
(30) is disposed so as to face each other, and the light emitting element (15) and the optical fiber (35) facing each other are configured to optically couple with each other. The middle part of each element (15) or the substrate (3) of the optical fiber array (30).
A wedge-shaped protrusion (36) is provided on any one of the intermediate portions of the optical fiber (35) of the incident side end face (33) of (1), and the other is fitted to the wedge-shaped protrusion (36). An optical array module having a wedge-shaped recess (16). 3. An optical fiber array (40) and a light receiving element array
(50) are arranged so as to oppose each other, and in a module configured to optically couple the respective light receiving element (55) with the respective optical fiber (45), the output end face of each of the optical fibers (45) is axially centered. As
The light receiving element array with the conical protrusions (48) formed in parallel on the output end surface side of the substrate (41) of the optical fiber array (40) and the incident surfaces of the respective light receiving elements (55) as the axes. The truncated conical protrusions (58) formed in parallel on the incident end face side of (50) and the holes (71) in which the light shielding film (P) is formed on the inner wall have a pitch equal to the parallel pitch of the optical fiber (45). The optical fiber array (40) and the block (70) interposed between the light receiving element array (50) are arranged in one opening of each of the holes (71). The optical array module is characterized in that the truncated cone-shaped protrusion (48) of (1) is fitted and the truncated cone-shaped protrusion (58) of the light receiving element array (50) is fitted in the other opening. 4. A light emitting element array (10) and an optical fiber array
(30) are arranged so as to oppose each other, and in the module configured to optically couple each light emitting element (15) with the opposing optical fiber (35), the emitting portion of each light emitting element array (10) is axially coupled. As a core, the truncated cone-shaped protrusions (18) formed in parallel on the emission end face side of the light emitting element array (10), and the incident end face of each of the optical fibers (35) as an axis,
The conical protrusions (38) formed in parallel on the incident end face side of the substrate (31) of the optical fiber array (30) and the hole (71) in which the light shielding film (P) is formed on the inner wall are the light emitting device.
Arranged at a pitch equal to the parallel pitch of (15), the light emitting element array (10) and a block (70) interposed between the optical fiber array (30), the one of each of the holes (71) The light emitting element array in the opening
An optical array module, characterized in that the truncated cone-shaped protrusion (18) of (10) is fitted, and the truncated cone-shaped protrusion (38) of the optical fiber array (30) is fitted in the other opening. .. 5. An optical array comprising the optical array module according to claim 2 or claim 4 on the transmitting side and the optical array module according to claim 1 or claim 3 on the receiving side. Link.