JP2002169045A - Optical transmitting and receiving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a miniaturized optical transmitting and receiving device which reduces electric and optical crosstalk. SOLUTION: The optical transmitting and receiving device 1 is provided with a first under clad layer 10, a first upper clad layer 20, a shield layer 30, an optical filter layer 40, a second upper clad layer 50 and a second under clad layer 60. An optical filter 12 which reflects only light of wavelength λ2 is formed in mid-way of an optical waveguide 11. Also, a slope 62 is formed at the end part of an optical waveguide 61. Light of wavelength λ1 exited from a light emitting element 3 is made incident on the optical waveguide 11 and propagates an optical fiber 2 after passing through the optical filter 12. Also, light of wavelength λ2 is made incident on the optical waveguide 11 from the optical fiber 2, propagates the optical waveguide 61 after being reflected by the optical filter 12 and the slope 61 and is made incident on a light receiving element 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical transmission / reception device, and more particularly, to an optical transmission / reception device used for a bidirectional optical communication system in the field of optical communication and an optical measurement system in the field of applied optical measurement.

[0002]

2. Description of the Related Art Hitherto, bidirectional optical transmission, in which an optical signal is bidirectionally propagated in one optical transmission line, is considered to be an important method for expanding the application area of optical communication. . In this optical bidirectional transmission, there is a method of multiplexing optical signals having different wavelengths, and a method of separating channels according to a difference in wavelength. An optical transmitter and an optical receiver are required as devices that enable this optical bidirectional transmission. In addition, in order to realize the optical bidirectional transmission using one optical fiber, a device that splits and extracts multiplexed light and simultaneously multiplexes and multiplexes light is also required. In order to reduce the size of such a device, a device using an optical waveguide in which an optical transmitter and an optical receiver are integrated has been considered.

As a conventional example of the above device, Japanese Patent Laid-Open No.
There is a wavelength division multiplexing transmission / reception device disclosed in Japanese Patent No. 100132. FIG. 9 is a plan view of a main part in which the wavelength multiplexing transmission / reception device is simplified. In FIG. 9, in the wavelength multiplexing transmission / reception device, a waveguide substrate 101 is fixed to a module package 100. Waveguide type substrate 10
In FIG. 1, a multiplexing waveguide 103a and a demultiplexing waveguide 103b are formed, and one end of each of the waveguides is coupled by a directional coupler 102 and is fused to the optical fiber 200. Here, the directional coupler 102 includes a multiplexing waveguide 103
By bringing a and the demultiplexing waveguide 103b close to each other by a certain length, light propagating through the inside is multiplexed and demultiplexed. Further, an anti-reflection coated glass 106 is attached to the other end of the multiplexing waveguide 103a. Further, the module package 100 includes an aspheric lens holder 10.
Light-Emitting Element Package 104a with 4b and Light-receiving Element Package 105 with Aspheric Lens Holder 105b
a is fixed. Here, the light emitting element package 1
Reference numeral 04a is arranged so that light emitted from the light emitting element package 104a passes through the aspheric lens holder 104b and the non-reflection coated glass 106 and enters the multiplexing waveguide 103a. Also, the light receiving element package 105
a is arranged such that light emitted from the other end of the branching waveguide 103b enters the light receiving element package 105a through the aspheric lens holder 105b.

Next, light propagation in the wavelength multiplexing transmission / reception device will be described. Light emitting device package 10
The light of wavelength λ1 emitted from 4a is emitted from the aspheric lens holder 104b, passes through the non-reflection coated glass 106, and enters the multiplexing waveguide 103a. After that, the wavelength λ1
Is propagated through the directional coupler 102 and the optical fiber 20
It is emitted to 0. On the other hand, the light of wavelength λ2 that has propagated through the optical fiber 200 is transmitted to the directional coupler 102 and the branching waveguide 1
03b. After that, the light having the wavelength λ2 passes through the aspheric lens holder 105b and passes through the light receiving element package 105.
a.

[0005]

However, in the conventional wavelength multiplexing transmission / reception device, the directional coupler 102 requires a certain length, and the demultiplexing waveguide 103b also requires a distance for bending the optical path. Therefore, there is a limit to miniaturization of the entire device. When the device is downsized, the distance between the light emitting element package 104a and the light receiving element package 105a becomes short. Further, the light emitting element package 104a and the light receiving element package 105a
Is that they are arranged on adjacent side surfaces of the module package 100, and thus have a problem that electrical and optical crosstalk occurs.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide an optical transmitting and receiving device that reduces electrical and optical crosstalk and is downsized.

[0007]

Means for Solving the Problems and Effects of the Invention In order to achieve the above object, the present invention has the following features. A first invention is a device for transmitting and receiving light of a plurality of wavelengths from a light propagation medium, wherein the device is formed near a top surface of a first optical waveguide substrate and a first optical waveguide substrate,
A first optical waveguide optically coupled to the light propagation medium;
An optical filter that is provided in the middle of the optical waveguide and reflects light having the first wavelength, a second optical waveguide substrate joined to the upper surface of the first optical waveguide substrate, and a second optical waveguide substrate And a second optical waveguide formed near the lower surface of the first optical waveguide and having a total reflection surface at an end thereof, and a mutual positional relationship between the optical filter and the total reflection surface is determined from the light propagation medium in the first optical waveguide. Is adjusted so that at least a part of the light reflected by the optical filter after passing through the optical filter crosses the total reflection surface and propagates through the second optical waveguide.

According to the first aspect, the optical transmitting / receiving device can emit light of a certain wavelength to the light propagation medium, and can receive and receive light of a different wavelength from the light propagation medium. Device. In addition, since the light emitting element and the light receiving element connected to the optical transmitting and receiving device can be freely arranged at different locations by changing the shapes of the first and second optical waveguides, the overall size of the device can be reduced. Is possible.

A second invention is an invention according to the first invention, wherein light having a first wavelength is incident from a light propagation medium and transmits a second wavelength different from the first wavelength. The emitted light is emitted to a light propagation medium.

According to the second invention, the light incident from the light propagation medium enters the first optical waveguide, is reflected by the optical filter, and then propagates to the second optical waveguide. Light emitted to the medium propagates through the first optical waveguide, passes through the optical filter, and can realize an optical transmission / reception device emitted from the first optical waveguide.

A third invention is an invention according to the second invention, wherein the light-emitting element is optically coupled to the first optical waveguide;
A light receiving element optically coupled to the second optical waveguide;
And the second optical waveguide substrate have a rectangular parallelepiped shape, and the light-emitting element and the light-receiving element are arranged in a diagonal positional relationship on opposite side surfaces of the joined first and second optical waveguide substrates. It is characterized by the following.

According to the third aspect, the light emitting element and the light receiving element can be arranged on opposite sides of the optical transmitting and receiving device and at the place where the distance is the longest, so that electrical and optical crosstalk is reduced. can do.

A fourth invention is an invention according to the first invention, wherein light having a first wavelength is emitted to a light propagation medium, and a second wavelength different from the first wavelength is emitted. The light
It is characterized by being incident from a light propagation medium.

According to the fourth aspect, the light incident from the optical propagation medium enters the first optical waveguide, passes through the optical filter, and then propagates to the first optical waveguide. The light emitted to the medium propagates through the second optical waveguide, is reflected by the optical filter, and can realize an optical transmission / reception device emitted from the first optical waveguide.

A fifth invention is an invention according to the fourth invention, wherein a light receiving element optically coupled to the first optical waveguide,
A light-emitting element optically coupled to the second optical waveguide;
And the second optical waveguide substrate have a rectangular parallelepiped shape, and the light-emitting element and the light-receiving element are arranged in a diagonal positional relationship on opposite side surfaces of the joined first and second optical waveguide substrates. It is characterized by the following.

According to the fifth aspect, the light emitting element and the light receiving element can be arranged on opposite sides of the optical transmitting and receiving device and at the place where the distance is the longest, so that electrical and optical crosstalk is reduced. can do.

A sixth invention is according to the first invention, and further comprises a shield layer between the first and second optical waveguide substrates for blocking an electrostatic magnetic field. And

According to the sixth aspect of the present invention, since the shield layer for blocking the electrostatic magnetic field is provided between the first and second optical waveguide substrates inside the optical transmitting / receiving device, the electrical cross-connect is further provided. Talk can be prevented.

A seventh invention is an invention according to the sixth invention, wherein the shield layer has a hole formed at least in a portion through which light propagating between the first and second optical waveguides passes. It is characterized by being performed.

An eighth invention is an invention according to the sixth invention, wherein the shield layer is formed at a portion other than an intersection plane between the first and second optical waveguides. .

According to the seventh and eighth aspects, light propagating between the first and second optical waveguides passes through a portion where the shield layer is not formed. It can be propagated without receiving a physical loss.

A ninth invention is an invention according to the eighth invention, wherein the shield layer is formed on the upper surface of the first optical waveguide substrate and at a portion other than the upper surface of the first optical waveguide. A first shield layer and a lower surface of the second optical waveguide substrate.
And a second shield layer formed at a portion excluding the lower surface of the second optical waveguide.

According to the ninth aspect, the first and second shield layers can be easily formed by forming the substrate using known patterning. Further, the first and second shield layers can easily form a shield layer that is not formed at a portion where the first and second optical waveguides in the seventh invention intersect.

A tenth invention is an invention according to the first invention, wherein a second wavelength different from the first wavelength is further provided between the first and second optical waveguide substrates. It is characterized by comprising an optical filter layer that reflects light.

According to the tenth aspect, an optical filter layer for reflecting light of the first wavelength is provided between the first and second optical waveguide substrates inside the optical transmitting / receiving device. Optical crosstalk can be prevented.

An eleventh invention is an invention according to the first invention, wherein the first and second optical waveguides are surrounded by a cladding layer.

According to the eleventh aspect, since the first and second optical waveguides are surrounded by the cladding layer,
In addition, loss of light propagating through the second optical waveguide can be reduced, and imbalance in light intensity distribution and optical waveguide mode distribution can be prevented.

[0028]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) FIGS.
FIG. 1 is a diagram illustrating an optical transmission / reception device according to a first embodiment of the present invention. 1 is a perspective view of the optical transmitting and receiving device, FIG. 2 is a perspective view of the optical transmitting and receiving device exploded for each layer, FIG. 3 is a side sectional view of the optical waveguide of the optical transmitting and receiving device cut along each optical axis, FIG. 4 is a perspective view of the optical transmitting / receiving device as viewed from the direction t in FIG. Hereinafter, FIGS. 1 to 4
The first embodiment will be described with reference to FIG.

In FIG. 1, the optical transmitting / receiving device 1 includes:
The optical fiber 2, the light receiving element 3, and the light emitting element 4 are optically coupled (the details of the optical coupling will be described later). The optical waveguides 11 and 61 are formed inside the optical transmitting and receiving device 1.

Next, the internal detailed structure of the optical transmitting / receiving device 1 will be described. FIG. 2 is an exploded perspective view of the optical transmitting / receiving device 1 for each layer for simplifying the description.
2, the optical transmitting and receiving device 1 includes a first under cladding layer 10, a first upper cladding layer 20, a shield layer 30, an optical filter layer 40, and a second upper cladding layer 5.
0 and the second under cladding layer 60. Hereinafter, the directions will be described using the X, Y, and Z directions shown in FIG.

An optical waveguide 11 is formed on the first under cladding layer 10 so as to be in contact with the first upper cladding layer 20. The optical waveguide 11 has end faces 11 a and 11 b formed on opposite side faces of the first under cladding layer 10. The end surface 11a is provided at the center of the side surface of the first under cladding layer 10, and the end surface 11b is provided at a position closer to the opposite side surface in the + Z direction, so that the optical waveguide 11 smoothly connects both end surfaces. Is formed. In the middle of the optical waveguide 11, an optical filter 12 that reflects only light of the wavelength λ2 is provided at an end face 11 of the optical waveguide 11.
The light incident from the a side is formed to be reflected in the + Y direction.

On the + Y direction side surface of the first upper clad layer 20, a shield layer 30 is deposited. The shield layer 30 is provided with a material that blocks an electrostatic magnetic field, such as Cu, Cr, Ti, or Al. A hole 31 is formed in the center of the shield layer 30, and an adhesive (not shown) having the same refractive index as that of the first upper clad layer 20 is provided in the space of the hole 31.
Is filled. In addition, as the adhesive, an acrylic ultraviolet curable resin or an epoxy ultraviolet curable resin whose refractive index can be adjusted is used. It is desirable that the first under cladding layer 10 and the first upper cladding layer 20 have the same refractive index.

The optical filter layer 40 is a multilayer filter that reflects light of wavelength λ1 emitted from the light emitting element 3,
It is arranged on the + Y direction side of the shield layer 30 described above.

In the second under cladding layer 60, an optical waveguide 61 is formed so as to be in contact with the second upper cladding layer 50. In the optical waveguide 61, an end face 61a is formed on the same side surface on the + X direction side as the end face 11a of the second under cladding layer 60. It is formed so as to smoothly connect with the surface 62. This inclined surface 6
Reference numeral 2 is provided to totally reflect light traveling in the + Y direction and propagate the light to the optical waveguide 61. It is desirable that the second under cladding layer 60 and the second upper cladding layer 50 have the same refractive index.

The first under cladding layer 10 and the first upper cladding layer 20 and the second under cladding layer 60 and the second upper cladding layer 50 are joined by an adhesive (not shown) having the same refractive index. You. In addition, as the adhesive, an acrylic ultraviolet curable resin or an epoxy ultraviolet curable resin whose refractive index can be adjusted is used. Further, the shield layer 30 and the optical filter layer 40, and the optical filter layer 40 and the second upper clad layer 50 are joined with an appropriate adhesive (not shown). Note that the first upper clad layer 20 and the shield layer 30 may be formed in separate steps, respectively, and joined with an appropriate adhesive. Also,
The first under cladding layer 10 and the first upper cladding layer 20 and the second under cladding layer 60 and the second upper cladding layer 50 may be simultaneously formed by a deposition method.

Next, connection between the optical transmitting / receiving device 1 and the optical fiber 2, the light emitting element 3, and the light receiving element 4 will be described. In FIG. 3, the optical fiber 2 is joined to the optical waveguide 11 at the end face 11a and optically coupled. The light emitting element 3 is joined to the optical waveguide 11 at the end face 11b and optically coupled. The first upper cladding layer 20 and the shield layer 30 are larger than the first under cladding layer 10 so as to cover the side surface in the + Y direction of the light emitting element 3 in order to reduce electrical and optical crosstalk to the light emitting element 3. Have been created. The light receiving element 4 is joined to the optical waveguide 61 at the end face 61a and optically coupled. Note that the second upper cladding layer 50, the optical filter layer 40, and the shield layer 30 cover the side surface of the light receiving element 4 in the −Y direction in order to reduce electrical and optical crosstalk to the light receiving element 4. It is made larger than the under cladding layer 60. When the optical fiber 2 and the first upper cladding layer 20 interfere with each other in the optical axis adjustment between the optical fiber 2 and the optical waveguide 11, the interference is prevented by forming the first upper cladding layer 20 into a concave shape. It doesn't matter.

Next, the positions of the optical filter 12, the hole 31, and the inclined surface 62 will be described with reference to FIGS. FIG. 4A shows the shield layer 30, the hole 31, the optical waveguides 11 and 6, for the sake of simplicity.
1, only the optical filter 12, the inclined surface 62, the optical fiber 2, the light emitting element 3, and the light receiving element 4 are shown in a perspective view as viewed from the direction t in FIG. 1, and FIG. It is the figure which expanded the part. 3 and 4, as described above, the optical filter 12 reflects the light of the wavelength λ2 propagating from the end face 11a side of the optical waveguide 11 in the + Y direction. Hole 31 is
The light path is larger than the light path through which the light passes, and
Are provided so that they do not interfere with each other. In addition, as described above, the inclined surface 62 reflects the light, and
1 is provided.

Next, propagation of light in the optical transmitting / receiving device 1 will be described. In FIG. 3, light of wavelength λ1 emitted from the light emitting element 3 enters the optical waveguide 11 from the end face 11b. Thereafter, the light of wavelength λ1 is
1 is transmitted to the optical filter 12. Since the optical filter 12 reflects the light having the wavelength λ2, the light having the wavelength λ1 passes through the optical filter 12, propagates through the optical waveguide 11, and reaches the end face 11a. Then, the light having the wavelength λ1 is emitted to the optical fiber 2 and propagates.

On the other hand, the wavelength λ propagating through the optical fiber 2
Light 2 enters from the end face 11 a of the optical waveguide 11. The light having the wavelength λ2 propagates through the optical waveguide 11 and enters the optical filter 12. Since the optical filter 12 reflects the light having the wavelength λ2, the light having the wavelength λ2 is reflected in the + Y direction. The reflected light having the wavelength λ2 passes through the holes 31 of the first upper cladding layer 20 and the shield layer 30, and then passes through the optical filter layer 40.
Incident on. Since the optical filter layer 40 reflects the light having the wavelength λ1, the light having the wavelength λ2 passes through the optical filter layer 40. Thereafter, the light having the wavelength λ2 passes through the second upper cladding layer and enters the inclined surface 62 of the optical waveguide 61. As described above, the inclined surface 62 is provided so that the light traveling in the + Y direction is totally reflected and propagated to the optical waveguide 61. Therefore, the light having the wavelength λ2 is totally reflected by the inclined surface 62 and propagates through the optical waveguide 61. After that, the light having the wavelength λ2 enters the light receiving element 4.

As described above, the optical transmitting / receiving device 1
The light having the wavelength λ1 can be emitted to the optical fiber 2, and the light having the wavelength λ2 can be incident and received from the optical fiber 2, thereby realizing a device for optical bidirectional transmission. Further, since the light emitting element 3 and the light receiving element 4 can be arranged freely by changing the shapes of the optical waveguides 11 and 61, the size of the entire device can be reduced. As a result, the light emitting element 3 and the light receiving element 4 are
Can be arranged on the opposite side and at the place where the distance is the longest, so that electrical and optical crosstalk can be reduced. In addition, the optical transmitting and receiving device 1
An optical filter layer for reflecting light having a wavelength of λ1;
Since leakage to the light receiving element 4 inside can be prevented, optical crosstalk can be further reduced. Further, inside the optical transmitting / receiving device 1, a light emitting element 3 is provided.
Since the shield layer 30 is provided between the light receiving element 4 and the light receiving element 4, electric crosstalk can be further prevented.

In the present embodiment, the light emitting element 3 is disposed on the first under cladding layer 10 and the light receiving element 4 is disposed on the second under cladding layer 60. However, the wavelength characteristics of the optical filter 12 and the optical filter layer 40 are different. May be changed, and the light receiving element 4 may be arranged on the first under cladding layer 10 and the light emitting element 3 may be arranged on the second under cladding layer 60. Also,
In the present embodiment, a device that emits light of wavelength λ1 and receives light of wavelength λ2 has been described. However, the optical waveguide 61
An optical filter that reflects light of a predetermined wavelength that propagates through the optical waveguide 61 in the + Y direction is disposed in the optical waveguide 61, and the above-described shield layer 3 is disposed on the + Y direction side of the second under cladding layer 60.
0, the optical filter layer 40, and the layer having the same structure as the second under-cladding layer 60 are further stacked (N-1) to realize an optical transmitting / receiving device capable of coping with demultiplexing or multiplexing of N wavelengths. It goes without saying that you can do it.

(Second Embodiment) Next, a second embodiment will be described as an embodiment in which the components of the optical transmitting and receiving device according to the first embodiment described above are reduced.
FIGS. 5 to 8 are views showing an optical transmitting and receiving device according to the second embodiment of the present invention. 5 is a perspective view of the optical transmitting and receiving device, FIG. 6 is a perspective view of the optical transmitting and receiving device opened in a central layer, and FIG. 7 is a side cross section of the optical waveguide of the optical transmitting and receiving device cut along each optical axis. FIG. 8 and FIG. 8 are perspective views of the optical transmitting and receiving device as viewed from the u direction in FIG. Hereinafter, the second embodiment will be described with reference to FIGS.

In FIG. 5, the optical transmitting / receiving device 5 includes:
The optical fiber 2, the light receiving element 3, and the light emitting element 4 are optically coupled (the details of the optical coupling will be described later). Optical waveguides 11 and 61 are formed inside the optical transmitting / receiving device 5.

Next, the internal detailed structure of the optical transmitting / receiving device 1 will be described. FIG. 6 is a perspective view of the optical transmitting and receiving device 5 in which the optical transmitting and receiving device is opened in a central layer for the sake of simplicity. In FIG. 6, the optical transmitting / receiving device 5 includes a first under cladding layer 10, shield layers 35 and 36, and a second under cladding layer 60. Hereinafter, the directions will be described using the X, Y, and Z directions shown in FIG.

The first under cladding layer 10 has an optical waveguide 11 formed near the upper surface in the + Y direction. The optical waveguide 11 has end faces 11 a and 11 b formed on opposite side faces of the first under cladding layer 10. The end face 11a is provided at the center of the side face of the first under clad layer 10, and the end face 11b is provided at a position closer to the opposite side face in the + Z direction so that the optical waveguide 11 smoothly connects both end faces. Is formed. In the middle of the optical waveguide 11, an optical filter 12 that reflects only the light of the wavelength λ2 is formed so as to reflect the light incident from the end face 11a side of the optical waveguide 11 in the + Y direction.

The shield layer 35 is deposited on the surface of the first under cladding layer 10 on the + Y direction side. The shield layer 35 is provided with a material that blocks an electrostatic magnetic field such as Cu, Cr, Ti, or Al, and is not formed on the upper surface of the optical waveguide 11. In this case, the shield layer 35 can be easily formed by forming a substrate using known patterning. If there is a concave portion on the upper surface of the optical waveguide 11, the space is filled with an adhesive (not shown) having the same refractive index as the first under cladding layer 10. Further, as the adhesive, an acrylic ultraviolet curable resin or an epoxy ultraviolet curable resin whose refractive index can be adjusted is used.

In the second under cladding layer 60, an optical waveguide 61 is formed near the lower surface in the -Y direction. The optical waveguide 61 has an end face 1 of the second under cladding layer 60.
An end face 61a is formed on the same side surface on the + X direction side as 1a,
The optical waveguide 61 is formed so as to smoothly connect with the inclined surface 62 formed at the center of the second under cladding layer 60. The inclined surface 62 is provided so that the light traveling in the + Y direction is totally reflected and propagated to the optical waveguide 61.

The shield layer 36 is deposited on the surface on the −Y direction side of the second under cladding layer 60. The shield layer 36 is provided with a material having an electric shielding effect such as Cu, Cr, Ti, and Al, and is not formed on the lower surface of the optical waveguide 61. In this case, the shield layer 36 can be easily formed by forming a substrate using known patterning. When there is a concave portion on the lower surface of the optical waveguide 61, the second under-cladding layer 6 is formed in that space.
Filled with an adhesive (not shown) having the same refractive index as 0. Further, as the adhesive, an acrylic ultraviolet curable resin or an epoxy ultraviolet curable resin whose refractive index can be adjusted is used.

The above-mentioned shield layers 35 and 36 are joined with an adhesive (not shown) having the same refractive index as the first or second under cladding layer 10 or 60. In addition,
As the adhesive, an acrylic UV curable resin or an epoxy UV curable resin whose refractive index can be adjusted is used. The first under-cladding layer 10 and the shield layer 35 and the second under-cladding layer 60 and the shield layer 3
6 may be prepared in separate steps and joined with an appropriate adhesive.

Next, the connection between the optical transmitting / receiving device 5 and the optical fiber 2, the light emitting element 3, and the light receiving element 4 will be described. In FIG. 7, the optical fiber 2 is optically coupled to the optical waveguide 11 at the end face 11a. Light emitting element 3
Is optically coupled to the optical waveguide 11 at the end face 11b. The light receiving element 4 is joined to the optical waveguide 61 at the end face 61a and optically coupled.

Next, the positions of the optical filter 12, the shield layers 35 and 36, and the inclined surface 62 will be described with reference to FIGS. In addition, FIG.
For ease of explanation, shield layers 35 and 36,
Optical waveguides 11 and 61, optical filter 12, inclined surface 6
2, only the optical fiber 2, the light emitting element 3, and the light receiving element 4 are shown in FIG.
8 (b) is a perspective view seen from the u direction of FIG.
It is the figure which expanded the B section of (a). 7 and 8, as described above, the optical filter 12 includes the optical waveguide 1.
The light of wavelength λ2 propagating from the end surface 11a side of the first X-ray 1 is reflected in the + Y direction. Also, as described above, the shield layer 35
Are not deposited on the surface of the optical waveguide 11 on the + Y direction side, and the shield layer 36 is not deposited on the surface of the optical waveguide 61 on the −Y direction side, so that the optical waveguides 11 and 61 overlap. There are no shield layers 35 and 36 in the part. Further, as described above, the inclined surface 62 is provided to reflect the light and propagate the light to the optical waveguide 61.

Next, propagation of light in the optical transmitting / receiving device 5 will be described. In FIG. 7, light of wavelength λ1 emitted from the light emitting element 3 enters the optical waveguide 11 from the end face 11b. Thereafter, the light of wavelength λ1 is
1 is transmitted to the optical filter 12. Since the optical filter 12 reflects the light having the wavelength λ2, the light having the wavelength λ1 passes through the optical filter 12, propagates through the optical waveguide 11, and reaches the end face 11a. Then, the light having the wavelength λ1 is emitted to the optical fiber 2 and propagates.

On the other hand, the wavelength λ propagating through the optical fiber 2
Light 2 enters from the end face 11 a of the optical waveguide 11. The light having the wavelength λ2 propagates through the optical waveguide 11 and enters the optical filter 12. Since the optical filter 12 reflects the light having the wavelength λ2, the light having the wavelength λ2 is reflected in the + Y direction. The reflected light of the wavelength λ2 enters the optical waveguide 61 from a portion where the shield layers 35 and 36 do not exist. At this time, the light having the wavelength λ2 is transmitted to the first or second under cladding layer 10.
Alternatively, it passes through a space filled with an adhesive (not shown) having the same refractive index as 60, or directly enters the optical waveguide 61. Then, the light having the wavelength λ2 is incident on the inclined surface 62 of the optical waveguide 61. As described above, the inclined surface 62 is provided so that the light traveling in the + Y direction is totally reflected and propagated to the optical waveguide 61. Therefore, the light having the wavelength λ2 is totally reflected by the inclined surface 62 and propagates through the optical waveguide 61. After that, the light having the wavelength λ2 enters the light receiving element 4.

Thus, the optical transmitting / receiving device 5
The light having the wavelength λ1 can be emitted to the optical fiber 2, and the light having the wavelength λ2 can be incident and received from the optical fiber 2, thereby realizing a device for optical bidirectional transmission. Further, since the light emitting element 3 and the light receiving element 4 can be arranged freely by changing the shapes of the optical waveguides 11 and 61, the size of the entire device can be reduced. As a result, the light emitting element 3 and the light receiving element 4 are
Can be arranged on the opposite side and at the place where the distance is the longest, so that electrical and optical crosstalk can be reduced. Further, inside the optical transmitting and receiving device 1, a shield layer 3 is interposed between the light emitting element 3 and the light receiving element 4.
5 and 36, electric crosstalk can be further prevented.

Note that the optical transmitting / receiving device 5 does not have an optical filter layer inside the device as compared with the above-described first embodiment, so that the effect of improving optical crosstalk is inferior. However, when such an effect is not expected, the optical transmitting and receiving device 5 is realized as a very inexpensive optical transmitting and receiving device because the number of components is smaller and the shield layer can be easily formed as compared with the first embodiment. can do.

In the present embodiment, the light emitting element 3 is disposed on the first under cladding layer 10 and the light receiving element 4 is disposed on the second under cladding layer 60. The light receiving element 4 may be arranged on the first under cladding layer 10 and the light emitting element 3 may be arranged on the second under cladding layer 60. In the present embodiment, the wavelength λ
The device that emits one light and enters the light of wavelength λ2 has been described. However, an optical filter that reflects light of a predetermined wavelength propagating through the optical waveguide 61 in the + Y direction is arranged in the optical waveguide 61, and the above-mentioned shield layers 35 and 36 are provided on the + Y direction side of the second under cladding layer 60. And a layer having the same structure as the second under cladding layer 60,
1) It is needless to say that an optical transmitting and receiving device that can cope with demultiplexing or multiplexing of N wavelengths can be realized by stacking in stages.

[Brief description of the drawings]

FIG. 1 is a perspective view of an optical transmitting and receiving device according to a first embodiment of the present invention.

FIG. 2 is an exploded perspective view of the optical transmitting and receiving device according to the first embodiment of the present invention for each layer.

FIG. 3 is a side sectional view cut along each optical axis of an optical waveguide of the optical transmitting and receiving device according to the first embodiment of the present invention.

FIG. 4 is a perspective view of FIG. 1 viewed from a direction t.

FIG. 5 is a perspective view of an optical transmitting and receiving device according to a second embodiment of the present invention.

FIG. 6 is a perspective view of an optical transmitting and receiving device according to a second embodiment of the present invention, which is opened at a central layer.

FIG. 7 is a side sectional view cut along each optical axis of an optical waveguide of an optical transmitting and receiving device according to a second embodiment of the present invention.

FIG. 8 is a perspective view of FIG. 5 viewed from the u direction.

FIG. 9 is a plan view of a main part of a simplified wavelength multiplex transmission / reception device disclosed in Japanese Patent Application Laid-Open No. 5-100132.

[Explanation of symbols]

 1, 5: Optical transmitting and receiving device 2: Optical fiber 3: Light emitting element 4: Light receiving element 10: First under cladding layer 11, 61 ... Optical waveguide 12: Optical filter 20: First upper cladding layer 30, 35, 36 ... Shield Layer 31 Hole 40 Optical filter layer 50 Second upper clad layer 60 Second under clad layer 62 Slope

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H01L 33/00 H01L 31/02 CF term (Reference) 2H037 AA01 BA02 BA11 BA24 CA00 CA37 DA40 2H047 KA03 KA12 KB08 LA09 MA05 MA07 RA08 TA01 TA23 TA43 5F041 AA47 DA57 EE08 FF14 5F088 BA03 BA15 BA16 EA11 JA03 JA11 JA13 JA14

Claims (11)

[Claims] 1. A device for transmitting and receiving light of a plurality of wavelengths from an optical propagation medium, comprising: a first optical waveguide substrate; a first optical waveguide substrate formed near an upper surface of the first optical waveguide substrate; A first optical waveguide to be optically coupled, an optical filter provided in the middle of the first optical waveguide and reflecting light having a first wavelength, and joined to an upper surface of the first optical waveguide substrate A second optical waveguide substrate, and a second optical waveguide formed near a lower surface of the second optical waveguide substrate and having a total reflection surface at an end thereof, wherein the optical filter and the total reflection surface are provided. The mutual positional relationship with
A positional relationship such that at least a portion of light that propagates through the first optical waveguide from the light propagation medium and is reflected by the optical filter intersects the total reflection surface and propagates through the second optical waveguide. An optical transmitting and receiving device, characterized in that it is adjusted to: 2. The light having the first wavelength is incident from the light propagation medium, and the light having a second wavelength different from the first wavelength is:
The light is emitted to the light propagation medium.
An optical transmitting / receiving device according to claim 1. 3. A light emitting device optically coupled to the first optical waveguide, and a light receiving device optically coupled to the second optical waveguide, wherein the first and second optical waveguide substrates are: The light-emitting element and the light-receiving element have a rectangular parallelepiped shape.
The optical transmission / reception device according to claim 2, wherein the optical transmission / reception device is arranged in a diagonal positional relationship on opposite side surfaces of the first and second optical waveguide substrates. 4. The light having the first wavelength is emitted to the light propagation medium, and the light having a second wavelength different from the first wavelength is:
The optical transmitting / receiving device according to claim 1, wherein the light is transmitted from the light propagation medium. 5. A light receiving element optically coupled to the first optical waveguide, and a light emitting element optically coupled to the second optical waveguide, wherein the first and second optical waveguide substrates are: The light-emitting element and the light-receiving element have a rectangular parallelepiped shape.
The optical transmission / reception device according to claim 4, wherein the optical transmission / reception device is arranged in a diagonal positional relationship on opposite side surfaces of the optical waveguide substrate and the second optical waveguide substrate. 6. The optical transmitting and receiving device according to claim 1, further comprising a shield layer between the first and second optical waveguide substrates for blocking an electrostatic magnetic field. 7. The method according to claim 7, wherein the shield layer includes at least the first
The optical transmitting / receiving device according to claim 6, wherein a hole is formed at a portion where light propagating between the first optical waveguide and the second optical waveguide passes. 8. The optical transmitting and receiving device according to claim 6, wherein the shield layer is formed at a portion other than an intersection plane between the first and second optical waveguides. 9. A first shield layer formed on an upper surface of the first optical waveguide substrate and at a portion excluding an upper surface of the first optical waveguide, wherein the second light guide is provided. 9. The optical transmitting and receiving device according to claim 8, wherein the optical transmitting and receiving device is constituted by a second shield layer formed on a lower surface of the waveguide substrate except for a lower surface of the second optical waveguide. 10. The semiconductor device according to claim 1, further comprising an optical filter layer between said first and second optical waveguide substrates, the optical filter layer reflecting light having a second wavelength different from said first wavelength. ,
The optical transmitting / receiving device according to claim 1. 11. The optical transceiver according to claim 1, wherein the first and second optical waveguides are surrounded by a cladding layer.