JPH04128812A - Assembling method for photosemiconductor module - Google Patents

Abstract

PURPOSE:To easily position the respective optical elements of the photosemiconductor module with high coupling efficiency by rotating a 1st holding part which holds an optical element and a 2nd holding part which holds an optical fiber at the inner circumference, positioning the optical axes in plane, and moving them in the optical axis direction and adjusting the optical axes. CONSTITUTION:The 1st holding part 2 which holds the optical element 1 is inserted from one end part of a sleeve 6 and the 2nd holding part 4 which holds the optical fiber 5 opposite the optical element 1 is inserted from the other end part. The inside diameter of the sleeve 6 is nearly equal to the outside diameters of the holding parts 2 and 4, so the centers of the optical axes of the optical element 1 and the tip of the optical fiber 5 are nearly aligned with each other, but optical noncoupling is caused depending upon the fitting positions or owing to variance at the time of assembly, so they are rotated at the inner circumference of the sleeve 6 as a countermeasure. Further, the holding part 2 or holding part 4 is slid in the optical axis direction. Consequently, the holding part 2 and holding part 4 can be arranged at the positions where the highest optical coupling efficiency is obtained.

Description

[Detailed Description of the Invention] [Summary] An object of the present invention is to provide a method for assembling an optical semiconductor module, in which the optical axis adjustment of an optical element and an optical fiber can be easily and efficiently combined. a cylindrical sleeve; a first holder having an outer diameter approximately the same as the inner diameter of the sleeve and holding the optical element; and a second holder having an outer diameter approximately the same as the inner diameter of the sleeve and holding the optical fiber. In the optical semiconductor module having a holding part, the first holding part is placed at one end of the sleeve, the second holding part is inserted into the other end, and the first holding part and/or the first holding part is inserted into the other end. Alternatively, the second holding portion may be rotated around the inner periphery of the sleeve to align the optical axes of the optical element and the optical fiber in a plane.

Furthermore, by moving the first holding part or the second holding metal in the optical axis direction, the holding part of the bore 1 and the second holding part of the hole 1 are moved so that the optical axes of the optical element and the optical fiber coincide. The optical axis of the second holding part is adjusted within the sleeve.

[Industrial application field]

The present invention relates to a method for assembling an optical semiconductor module, and more specifically, the present invention relates to a method for assembling an optical semiconductor module, and more specifically, the present invention relates to a method for assembling an optical semiconductor module, and more specifically, a first holding part for holding an optical element and a second holding part for holding an optical fiber, which are inserted and arranged inside a sleeve.
A method for assembling an optical semiconductor module in which the optical axes of the optical element and the optical fiber can be easily aligned with a high coupling efficiency by rotating the holding part on the inner periphery of the sleeve and moving it in the optical axis direction. Regarding.

In recent years, as optical communication technology has improved and spread, there has been a demand for cheaper optical semiconductor modules.

[Prior Art] FIG. 4 is a cross-sectional view of a conventional optical semiconductor module taken parallel to the optical axis.

In the figure, 1 is an optical element, 2 is a first holding part that holds an optical element, 3 is a spherical condenser lens, 5 is an optical fiber, and 4 is the optical fiber 5 at a position opposite to the optical element 1. A second holding part 6 holds a sleeve formed in the shape of a hollow cylinder, 7 a cap for hermetically sealing the optical element 1, and 8 a condensing lens frame that holds the condensing lens 3 at a low melting point. Glass and soldering are held in place by press fitting.

10 is a window made of glass bonded to the camp 7 through a low melting point glass.

13a and 13b are optical element terminals, and 13a is directly connected to the optical element. 13b is connected to the optical element 1 by a lead wire 15.

Reference numeral 9 denotes solder or adhesive resin for bonding the sleeve 6 and the second holding portion 4 together, and reference numeral 11 denotes an adhesive for bonding the second holding portion 4 and the optical fiber 5 together. 14 indicates an optical cable.

Hereinafter, the optical element 1 is metalized at the element mounting position of the first holding part 2, and is bonded to the camp 7 and the first holding part 2 through a brazing material made of Au-3n alloy or the like. Hermetically sealed.

The optical element I and the optical fiber 5 are connected to the condenser lens 3
A method for adjusting the optical axis via the following will be explained.

First, when the optical element 1 is a light emitting element, the light output emitted from it is received by a light receiving element provided at the output end of the optical cable 14, converted into an electrical signal, and measured by a power meter.

When the optical element 1 is a light receiving element, the light receiving element receives the incident light from the optical cable 14 side, and its output is measured by a power meter between the optical element terminals 13a and 13b.

While performing the above operations, the optical axis is adjusted at the connecting portion between the cap 7 and the condensing lens frame 8 and the connecting portion between the condensing lens frame 8 and the sleeve 6 so that the amount of light received is maximized. Planar alignment (i.e. X-Y plane adjustment)
By further moving the second holding part 4 in parallel within the sleeve 6, positioning in the optical axis direction (i.e. Z
(8 circumferential alignment in the axial direction).

Then, the first holding part 2 that holds the optical element 1 and the condenser lens that holds the condenser lens 3 in a state where the optical element 1 and the optical fiber 5 have maximum coupling efficiency. The frame 8 and the sleeve 6 that holds the second holding part 4 are firmly held.

In this state, the camp 7 and the condensing lens frame 8, the condensing lens frame 8 and the sleeve 6, and the second holding part 4 and the sleeve 6 are fixed by laser welding.

[Problem to be solved by the invention]

In the method for assembling an optical semiconductor module according to the prior art described above, the optical element bonded to the first holding part is hermetically sealed with a cap.

Therefore, the first holding section has the characteristics of being easy to handle (and capable of holding the optical element in a stable state).

However, in the optical semiconductor module having the above configuration, when adjusting the optical axes of the optical element and the optical fiber, the center of the optical axis is first roughly adjusted, and then the center of the optical axis and the direction of the optical axis are finely adjusted. After that, the first holding part, the condensing lens frame, and the sleeve must be fixed and held and welded so that the optical axis does not shift.

That is, there is a problem that the assembly process is complicated, and the assembly time and manufacturing cost are high.

SUMMARY OF THE INVENTION In view of these problems, it is an object of the present invention to provide a method for assembling an optical semiconductor module that allows each optical element within the optical semiconductor module to be easily aligned with high coupling efficiency.

[Means to solve the problem]

In order to achieve the above object, the present invention includes a hollow cylindrical sleeve, a first holding portion that holds an optical element and has an outer diameter that is approximately the same as the inner diameter of the sleeve, and a first holding portion that holds an optical element and has an outer diameter that is approximately the same as the inner diameter of the sleeve. a second holding part having an outer diameter and holding an optical fiber, the first holding part is inserted into one end of the sleeve, and the first holding part is inserted into the other end at a position facing the optical element. inserting a second holding part and rotating the first holding part and/or the second holding part on the inner periphery of the sleeve;
The optical axes of the optical element and the optical fiber are aligned in a plane.

Further, by moving the first holding part that holds the optical element or the second holding part that holds the optical fiber in the optical axis direction to adjust the optical axis, the optical element and the optical fiber can be moved. The present invention provides a method for assembling an optical semiconductor module characterized by optical coupling.

[Effect]

FIG. 1 is a diagram showing the principle of the present invention, and is a sectional view taken parallel to the optical axis of an optical semiconductor module.

Note that the same parts as in FIG. 4 are given the same numbers.

In the optical semiconductor module according to the present invention, the first holding part 2 that holds the optical element 1 is inserted from one end of the sleeve 6, and
It has a structure in which a second holding part 4 that holds the optical fiber 5 at a position facing the optical element 1 is inserted from the other end.

The inner diameter of the sleeve 6, the first holding part 2, the second
Since the outer diameter of the holding part 4 is almost the same, the first holding part 2 and the second holding part 4 are
At the time when the optical element 1 and the tip of the optical fiber 5 are inserted, the centers of the optical axes of the optical element 1 and the tip of the optical fiber 5 are approximately aligned.

However, since the mounting position of the optical element on the first holding part and the position where the optical fiber tip is held vary when they are assembled, it is difficult to achieve efficient optical coupling.

Therefore, in the present invention, when aligning the optical axes of the optical element 1 and the optical fiber 5 in a plane, they are rotated on the inner periphery of the sleeve 6.

Further, when adjusting the optical axis direction, the first holding part 2 or the second holding part 4 is slid in the optical axis direction within the sleeve.

According to the present invention, by performing the above operation, the first holding part 2 and the second holding part 2 are placed at a position where the optical coupling efficiency is highest.
This makes it possible to arrange the holding portion 4 in the following manner.

(Example) FIG. 2 is a block diagram of an optical semiconductor module assembly of the present invention.

In FIG. 2, the same parts as in FIG. 1 are given the same numbers.

In the figure, 16 is a stem chuck that fixes the first holding part 2, 17 is a sleeve chuck that is fixing the sleeve 6, 18 is a ferrule chuck that is fixing the second holding part 4, and 19 is a pulse chuck. Rotation control device using a motor, 20
is a control device in the Z-axis direction using a pulse motor, 21 is an induction coil for soldering, 22 is a sensor part that converts the optical output into an electrical signal and measures it, and 23 is a sensor part 22. A control unit controls the rotation control device 19 and the Z-axis direction control device 20, and 24 indicates a power source.

The inner diameter of sleeve 6 is φ2 (accuracy +0.005.-0)
mm, and the outer diameter of each of the first holding part 2 and the second holding part 4 has an accuracy of about φ2 (accuracy value: -0,005) mm.

In the structure of this embodiment, the optical element 1 is placed at the center of the first holding part 2 with a diameter of φ0.
The second holding part 4, which holds the first holding part 2 and the optical fiber 5 having a spherical tip via an adhesive 11, is attached with an accuracy of 0.02 mm or less, and the sleeve 6 is attached in a nitrogen atmosphere. Insert each from both ends.

When the optical element 1 is a light emitting element, the light output emitted from it is received by the sensor part 22 connected to the output end of the optical cable 14, converted into an electrical signal, and sent to the control unit 23.
The Z-axis control device 20 is controlled so that the amount of light received by the optical fiber 5 is maximized, and the second
The holding portion 4 and the optical element 1 are gradually brought closer together to adjust the optical axis direction. The light emitting surface or light receiving surface of the optical element 1 and the tip of the optical fiber 5 are brought close to each other by about 0.01 mm to 0.1 mm.

Similarly, the rotation control device 19 finely adjusts the center of the optical axis of the second holding part 4 along the inner circumference of the sleeve 6, and the first holding part 4 is held at a position where the light coupling efficiency is highest. part 2 and the second holding part 4 are arranged.

Further, when the optical element 1 is a light receiving element, the power source 24 is connected to the output end of the optical cable 14, and the sensor portion 22 is connected to the optical element terminal 13a.

13b and take the same method as above.

In this state, the first holding part 2 and the second holding part 4 are fixed to the sleeve 6 by the induction coil 21 via solder or adhesive resin 9, and hermetically sealed.

As described above, in the optical semiconductor module assembly method of this embodiment, the inner diameter of the sleeve 6 and the outer diameter of the first holding part 2 and the second holding part 4 are approximately the same diameter, and the sleeve 6, the first holding part 2 and the second holding part 4
When the optical element 1 and the tip of the optical fiber 5 are inserted, the centers of the optical axes of the optical element 1 and the optical fiber 5 are roughly aligned. This includes the task of detecting high-level positions.

Therefore, high optical coupling efficiency can be obtained, and the work is extremely simple.

FIG. 3 is a sectional view taken parallel to the optical axis to explain the second embodiment.

Note that the same parts as in Fig. 1.2 are given the same numbers.

In the figure, 3 indicates a condenser lens.

Reference numeral 12 indicates a metal tube, which is located between the first holding part 2 and the condensing lens 3, and between the second holding part 4 and the condensing lens 30.
It serves as a spacer to maintain a constant distance between the two.

This embodiment differs from the first embodiment in that a condenser lens 3 is interposed between the optical element 1 and the optical fiber 5.

In the first embodiment, the tip of the optical fiber 5 was spherical, but in this embodiment, the optical axes of the optical element 1 and the optical fiber 5 are aligned through the condenser lens 3. In this case, the tip of the optical fiber 5 facing the optical element 1 may have an inexpensive polished tapered shape instead of a spherical tip.

However, in the first embodiment, the spherical tip played the role of the condensing lens 5;
In this embodiment, since the condenser lens 3 and the optical fiber 5 are provided individually, it is necessary to align them.

Therefore, in this embodiment, the metal tube 12, which is the holding portion of the condensing lens 3, also serves as a spacer.

The condensing lens 3 has an outer diameter with an accuracy of about φ2 (accuracy 10, -0,005) mm relative to the inner diameter of the sleeve 6, and is placed at a predetermined position inside the sleeve 6. After the arrangement, the metal tube 12 is press-fitted from both ends of the sleeve 6 and fixed.

The method of assembling each holding part is the same as in the first embodiment, but with this configuration, the first holding part 2 and the second holding part 4 can be positioned at approximately appropriate positions through the condensing lens 3. Since the converging lens and optical fiber are separate parts, the complexity of alignment is reduced.

〔Effect of the invention〕

As explained above, according to the method for assembling an optical semiconductor module of the present invention, after inserting the first holding part and the second holding part into the sleeve, the first holding part and/or the second holding part It includes the work of rotating.

Therefore, the optical element and the optical fiber can be optically coupled within the sleeve with high coupling efficiency.

In particular, the optical semiconductor module used in fields where high optical coupling efficiency is not required and is used at low power (short-distance LAN, etc.) In optical coupling assembly with a characteristic of 20% or less (when 100% light is incident on the light incident part), the time and manufacturing cost are about half that of conventional optical semiconductor module optical coupling assembly. be able to.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional diagram showing the principle of the optical semiconductor module of the present invention, taken parallel to the optical axis. FIG. 2 is a configuration diagram showing the optical semiconductor module assembly method of the present invention. FIG. 4 shows a cross-sectional view of a conventional optical semiconductor module taken parallel to the optical axis. In the figure, 1 is an optical element, 2 is a first holding part, 3 is a condensing lens, 4 is a second holding part, 5 is an optical fiber, 6 is a sleeve, 7 is a cap, and 8 is a condensing lens frame. , 9 is solder or adhesive resin, 10 is a window, 11 is an adhesive, 12 is a metal tube, 13a, 13b are optical device terminals, 14 is an optical cable, 15 is a lead wire 16 is a stem chuck, 17 is a sleeve chuck, 18
is a ferrule chuck, 19 is an X-Y rotation control device, 2
0 is a Z-axis control device, 21 is an induction coil, 22 is a part of a sensor, 23 is a control unit, and 24 is a power source. Figure 1 of the present invention

Claims (2)

[Claims] (1) A hollow cylindrical sleeve (6), a first holding part (2) having an outer diameter that is approximately the same as the inner diameter of the sleeve (6) and holding the optical element (1), and a first holding part (2) that holds the optical element (1); ) has an outer diameter that is almost the same as the inner diameter of the optical fiber (5
) and a second holding part (4) that holds the first holding part (2) at one end of the sleeve (6).
and inserting the second holding part (4) into the other end of the first holding part (2) and/or the second holding part (
4) in a plane perpendicular to the optical axis direction (X-Y plane) to planarly align the optical axes of the optical element (1) and the optical fiber (5). How to assemble an optical semiconductor module. (2) In the method for assembling an optical semiconductor module according to claim (1), the first holding part (2) holding the optical element (1) and/or at a position facing the optical element (1) By moving the second holding part (4) that holds the optical fiber (5) in the optical axis direction (Z-axis direction), the optical element (1
) and the optical fiber (5) in the optical axis direction.