JPH0756060A - Optical package - Google Patents

Abstract

PURPOSE:To provide an optical package which is easy to produce and is connected with a small loss and facilitates installation of an optical fiber while holding the optical axis adjustment of high precision by constituting a part of a package body and/or a cover body of an optical waveguide, a diffraction type optical element, or a refraction type optical element. CONSTITUTION:The optical package consists of a package body 1, where an optical integrated circuit A is mounted, and a cover body 2 covering the upper face of the package body 1, and the package body 1 consists of a plate-shaped substrate 3, terminal pins 4 for connection between the optical integrated circuit A provided on or in the substrate 3 and the outside, a frame part 5 for mounting of the optical integrated circuit A, and an optical waveguide 6 which is interposed between an optical fiber B and the optical integrated circuit A as a part of the frame part 5. Since the optical waveguide 6 is formed in this manner, it is unnecessary to uniformly and precisely form grooves at the time of working of V grooves or holes or the like, and the production is facilitated. When correlations between the optical waveguide 6 and the optical fiber B are preliminarily determined, it can be installed as an optical fiber array.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an optical signal to an electric signal,
Or, it relates to an improved optical package for connecting an optical fiber and an optical integrated circuit for converting an electric signal into an optical signal.

[0002]

2. Description of the Related Art A conventional optical package has a V-groove 103 for mounting an optical fiber and a terminal pin 104 connected to an optical integrated circuit, as shown in a schematic perspective view of FIG. It is composed of a mounting body 101 and a lid 102 for covering the upper surface of the mounting body 101. An optical integrated circuit is mounted in the mounting body 101, an optical fiber is placed in the V groove 103, and then mounted by an adhesive or the like. A configuration in which the body 101 and the lid body 102 are integrated and at the same time the optical fiber is fixed in the V groove 103 (see Japanese Utility Model Laid-Open No. 61-176512), or as shown in the perspective schematic view of FIG. A hole 105 is provided on the bottom surface of the mounting body 101, and the optical integrated circuit A
Was installed, and the optical fiber B was inserted into the hole 105 and fixed by an adhesive (see Japanese Utility Model Laid-Open No. 61-144658).

[0003]

However, the conventional configuration as shown in FIGS. 9 and 10 requires a step of processing the V groove 103 or the hole 105 in a part of the mounting body 101. In order to connect B and the optical integrated circuit A with low loss, it is necessary to form a plurality of V-grooves 103 or holes 105 uniformly and precisely, which requires a very long time and labor during processing, and There is also a problem that it takes much time and labor to install and fix the plurality of optical fibers B one by one in the V groove 103 or the hole 105 at a desired position.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems and provides an optical package including a mounting body for mounting an optical integrated circuit and a lid body for covering the upper surface of the mounting body. And an optical package in which a part of the mounting body and / or the lid body is configured by an optical waveguide, a diffractive optical element, or a refractive optical element. Note that the diffractive optical element is an optical element that uses the diffraction phenomenon of light to convert the deflection angle of the optical path and the light flux, and the refractive optical element uses the refraction phenomenon of light to convert the light flux. It is an optical element.

[0005]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 8 show an embodiment of the present invention, showing seven configurations and one manufacturing method, and the same members are denoted by the same reference numerals in the drawings. The schematic perspective view of FIG. 1 is a structure showing a first embodiment of the present invention. An optical package includes a mounting body 1 for mounting an optical integrated circuit A and a lid body 2 for covering an upper surface of the mounting body 1.
The mounting body 1 mounts a plate-like substrate 3, an optical integrated circuit A provided on the substrate 3 or inside the substrate 3 and terminal pins 4 for connecting to the outside, and an optical integrated circuit A provided on the substrate 3. And a light guide 6 interposed between the optical fiber B and the optical integrated circuit A as a part of the frame 5.

In order to manufacture an optical package using the mounting body 1 and the lid body 2, the optical integrated circuit A is installed inside the frame 5, and the optical fiber B is used for optical signal transmission through the optical waveguide 6. The optical integrated circuit A, the optical fiber B, or the optical waveguide 6 is installed at a position on the substrate 3 where it can be performed and the optical axis is adjusted to adjust the optical loss. The optical fiber B is fixed by an adhesive or soldering, and the mounting body 1 and the lid 2 are integrated by an adhesive or the like. It should be noted that the optical waveguide 6 may be installed or processed by selecting one which has a lower loss connection than the optical integrated circuit A and the optical fiber B used in advance, or the optical integrated circuit A.
Alternatively, after the optical fiber B is installed, the optical fiber B may be installed or processed so as to have a low loss connection.

When the optical waveguide 6 is formed in a part of the frame portion 5 as in the above structure, it is not necessary to form the groove uniformly and precisely as in the case of processing a V groove or a hole, and When such a material is fitted into the frame portion 5, the optical waveguide 6 having a shape that can be easily fitted is used, and the groove has a processing accuracy such that the optical waveguide 6 can be fixed and can be hermetically sealed with an adhesive. When a part of the above is used as the optical waveguide 6 by processing or the like, it is not necessary to form the groove at all, and therefore the manufacturing is very easy. In addition, when installing the optical fibers B, it is not necessary to mount them one by one, and the optical waveguide 6 and the optical fibers B,
Further, by determining the correlation with the optical waveguide 6 in advance, a low-loss connection and a highly accurate optical axis adjustment can be made only by directly installing the optical fiber array in which the optical fibers B are put together on the substrate 3. It becomes very easy to install the optical fiber B while holding the.

In the above embodiment, the lid 2 is constructed so as to cover it from the upper surface of the mounting body 1. However, the same applies to the configuration of the mounting body 1 or other side surfaces as required. Is. Further, the optical waveguide 6 may have any size, number, and location as long as it can be interposed between the optical integrated circuits A to be connected and the plurality of optical fibers B, for example, When the surface emitting optical integrated circuit A is used, the optical waveguide 6 may be formed on the bottom surface of the mounting body 1 or the lid body 2. Then, the mounting body 1 may be made of a material such as quartz glass, silicon, or ceramics, but the optical waveguide 6 is made of the same material as the core of the optical fiber B to be used, or a material more refracted than the material of the mounting body 1. It is sufficient to form the optical waveguide 6 by using a material having a high rate. To form the optical waveguide 6, a groove is provided in the frame portion 5, and the optical waveguide 6 is fitted and adhered.
Alternatively, a part of the frame portion 5 may be formed as the optical waveguide 6 by doping or etching. Furthermore, the optical waveguide 6
Assuming that an expanded waveguide such as a taper type, a multi-core type, or a distributed coupling type is used, and both ends have an optimum coupling diameter of both the optical integrated circuit A and the optical fiber B, the tolerance in the direction perpendicular to the optical axis is It is possible to improve the characteristics,
For example, in the Ti-diffused LiNbO ₃ waveguide or the glass waveguide, the material that has been added to the core and enhances the refractive index may be diffused by heat from the outside to expand the core.

Instead of the optical waveguide 6, a diffractive optical element or a refractive optical element may be used. A diffractive optical element is an optical element that utilizes the diffraction phenomenon of light, such as a relief hologram or Fresnel lens in which fine grooves are periodically cut, or a refractive index in which the refractive index is changed at regular intervals with a minute interval. There are variable holograms and photorefractive crystals. By using this diffractive optical element, it is possible to polarize the optical path of the light emitted from the optical fiber B or the optical integrated circuit A, and connect the light emitting or light receiving portions of the plurality of optical integrated circuits A to the optical fiber B. You will be able to make many combinations. Furthermore, a light beam conversion function can be added to this diffractive optical element, and the optical fiber B and the optical integrated circuit A can be efficiently connected by the lens function. Further, the refraction type optical element is an optical element utilizing the phenomenon of refraction of light, for example,
There are a lens, a resin-molded lens integrally molded with a light-transmissive resin, and a cylindrical lens in which the curvature of the lens is changed in the X-axis direction and the Y-axis direction. By using this refraction type optical element, the optical fiber B and the optical integrated circuit A can be efficiently connected. In particular, if a cylindrical lens is used, one-to-many connection between the optical fiber B and the optical integrated circuit A becomes possible.

The schematic sectional view of FIG. 2 shows the structure of the second embodiment of the present invention. The mounting body 1 includes a substrate 3, terminal pins 4,
The frame portion 5, an optical waveguide 6 formed in a part of the frame portion 5, an electrode 7 connected to the terminal pin 4 and bonded to the optical integrated circuit A, and a portion of the inner surface of the frame portion 5 including at least the optical waveguide 6. It is composed of an antireflection film 8.

As described above, by coating the antireflection film 8 effective for the wavelength of the optical integrated circuit A, leakage light or the like generated in optical transmission is repeatedly reflected in the package to become scattered light, It is possible to prevent the characteristics of the device from being adversely affected by the noise component of the signal of. The antireflection film 8 is also formed on the back surface of the lid 2.
By coating with, it becomes possible to more reliably prevent the reflection of light.

Further, by sloping the outside of the frame portion 5 and connecting and fixing the optical fiber array C to the frame portion 5, the connection surface D of the optical fiber array C is inclined with respect to the optical axis direction. Since the structure having an angle can be adopted, the influence of the reflected return light on the connection surface D can be reduced.

The schematic cross-sectional view of FIG. 3 shows the structure of a third embodiment of the present invention, in which a lens 9 is installed in the optical waveguide 6 inside the frame 5. Such a lens 9
By configuring the above, the coupling efficiency between the optical integrated circuit A and the optical waveguide 6 can be improved. Further, if another refractive optical element or diffractive optical element is installed instead of the lens 9, it becomes possible to make many combinations of the light emitting or light receiving portions of the plurality of optical integrated circuits A and the optical fiber B.

The perspective schematic view of FIG. 4 shows the structure of a fourth embodiment of the present invention, in which the lid body 2 has a concave portion corresponding to the outside of the frame portion 5 of the mounting body 1, and the lid body is formed. The optical fiber array C is integrated with a part of the frame portion 2 of FIG. By thus forming the lid body 2 with the concave portion and integrating the optical fiber array C, the joint surface between the optical fiber array C and the optical waveguide 6 can be protected,
In addition, the position where the optical fiber array C is installed can be accurately determined.

The perspective schematic view of FIG. 5 (a) shows the fifth embodiment of the present invention.
In this structure, the mounting body 1 has a disc shape, the lid body 2 has a hemispherical shape, and the diffractive optical element 16 is formed on a part of the lid body 2. With such a configuration, by varying the optical path changing degree of the diffractive optical element 16, it is possible to make many combinations of the light emitting or light receiving portion of the optical integrated circuit A and the optical fiber B, and moreover, the lid. Since the body 2 has a hemispherical shape, it becomes possible to secure the transmission of the optical signal in a wide angle range. Here, if the lid 2 is made of a material that passes only the wavelength of light used, the influence of external light can be removed, and for example, optical glass molded of GaAs or Si may be used. When a relief type diffractive optical element is used as the diffractive optical element 16, it can be formed by a transfer method. Further, when a material capable of transmitting light is used for the mounting body 1, or when the optical integrated circuit A is installed also on the back surface of the mounting body 1, as shown in the schematic perspective view of FIG. In addition, two hemispherical lids 2 can be combined to form a spherical lid.

A perspective schematic view of FIG. 6 shows a structure showing a sixth embodiment of the present invention, in which the lid 2 is a cube and the portion where the optical fiber B and the optical integrated circuit need to be connected is ion-exchanged. Refractive optical element 2 such as a planar microlens
This is the case where 6 is formed. By thus forming the lid body 2 into a cube, the optical integrated circuit A can be mounted in a high space and can be miniaturized. Further, when the optical integrated circuit A is not mounted inside and only the lid body 2 is configured, optical transmission between a plurality of optical fibers can be performed three-dimensionally.

The schematic sectional view of FIG. 7 is a schematic sectional view showing a method of manufacturing an optical package when an optical resin which is the diffractive optical element 16 of the present invention is used, and is shown in FIG. 7 (a). As described above, the optical integrated circuit A is installed in the mounting body 1 in a state where the optical axis adjusting light source 11 is preset on the optical axis of the light emitting or light receiving portion a of the optical integrated circuit A. At this time, the diffractive optical element 16 has not yet received the information on the change in the refractive index and remains as a mere transmitting object. Then, as shown in FIG. 7B, an optical fiber array C composed of a plurality of optical fibers B is installed at a target position, and a light beam having the same wavelength as the light beam from the optical axis adjusting light source 11 is arranged in the optical fiber array. When the optical integrated circuit A is irradiated with light from C, interference fringes of two light beams having the same wavelength are stored inside the diffractive optical element 16 as a change in refractive index.
At this time, even if there is an error in the pitch of each optical fiber B of the optical fiber array C, due to the principle of interference, the direction of the interference fringes of the two light fluxes is formed in a direction that corrects the error. Further, as shown in FIG. 7C, the optical fiber fixing block 12 for fixing the optical fiber array C is fixed to the optical fiber B, and the mounting body 1 and the lid body 2 are integrally manufactured.

A partially enlarged sectional schematic view of FIG. 8 shows a structure showing a seventh embodiment of the present invention, and by using a diffractive optical element 16 similar to that shown in FIG. Even when the optical fiber array C including the optical fibers B is connected, the optical fiber array C can be installed very easily while maintaining low-loss connection and maintaining highly accurate optical axis adjustment.

[0019]

As described above, according to the optical package of the present invention, a part of the mounting body and / or the lid body is an optical waveguide,
By constructing with a diffractive optical element or a refractive optical element, it is very easy to manufacture, and it is possible to install the optical fiber very easily while maintaining low loss connection and highly accurate optical axis adjustment. An optical package can be provided.

[Brief description of drawings]

FIG. 1 is a schematic perspective view showing a first embodiment of an optical package of the present invention.

FIG. 2 is a schematic sectional view showing a second embodiment of the optical package of the present invention.

FIG. 3 is a schematic cross-sectional view showing a third embodiment of the optical package of the present invention.

FIG. 4 is a schematic perspective view showing a fourth embodiment of the optical package of the present invention.

FIG. 5 is a schematic perspective view showing a fifth embodiment of the optical package of the present invention.

FIG. 6 is a schematic perspective view showing a sixth embodiment of the optical package of the present invention.

FIG. 7 is a schematic cross-sectional view showing the manufacturing process of the optical package of the present invention.

FIG. 8 is a partially enlarged sectional schematic view showing a seventh embodiment of the optical package of the present invention.

FIG. 9 is a schematic perspective view showing a conventional optical package.

FIG. 10 is a schematic perspective view showing a conventional optical package.

[Explanation of symbols]

 1, 101: Mounted body 2, 102: Lid body 3: Substrate 4, 104: Terminal pin 5: Frame part 6: Optical waveguide 7: Electrode 8: Antireflection film 9: Lens 11: Optical axis adjusting light source 12: Optical fiber Fixed block 16: Diffractive optical element 26: Refractive optical element 103: V groove 105: Hole A: Optical integrated circuit a: Light emitting or light receiving portion B: Optical fiber C: Optical fiber array D: Connection surface

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[Procedure amendment]

[Submission date] April 15, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0018

[Correction method] Change

[Correction content]

A partially enlarged sectional schematic view of FIG. 8 shows a structure showing a seventh embodiment of the present invention, and by using a diffractive optical element 16 similar to that shown in FIG. Even when the optical fiber array C including the optical fibers B is connected, the optical fiber array C can be installed very easily while maintaining low-loss connection and maintaining highly accurate optical axis adjustment. The optical waveguide in the present invention is an optical element that utilizes the light guiding phenomenon, and is an element that changes the optical path according to the shape and direction of the waveguide made of a medium having a higher refractive index than the surroundings. Further, the diffractive optical element is an optical element that utilizes the diffraction phenomenon of light in order to convert the deflection angle of the optical path and conversion of the light flux, and forms interference fringes of light on the substrate by irradiation of light, or on the substrate. It is an element that changes the optical path by diffracting light by a diffraction grating formed with unevenness.
A refraction-type optical element is an element that utilizes the phenomenon of refraction of light to convert a light beam, and refracts light by obtaining refraction according to the shape of the incident surface of the light or the angle of incidence on the incident surface. This is an element that changes the optical path.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Akira Kashiwazaki 2-14-9 Tamagawadai, Setagaya-ku, Tokyo Kyocera Corporation Tokyo Yoga Works

Claims (3)

[Claims] 1. An optical package comprising a mount body for mounting an optical integrated circuit and a lid body for covering the mount body, wherein the mount body and / or a part of the lid body is constituted by an optical waveguide. Optical package. 2. An optical package comprising a mounting body for mounting an optical integrated circuit and a lid body for covering the mounting body, wherein the mounting body and / or part of the lid body is constituted by a diffractive optical element. And optical package. 3. An optical package comprising a mounting body for mounting an optical integrated circuit and a lid body for covering the mounting body, wherein the mounting body and / or a part of the lid body is constituted by a refraction type optical element. And optical package.