JPH01508A - optical coupling device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an optical coupling device that couples the emitted light of two light-emitting semiconductor elements used in optical communication to an optical fiber.

[Conventional technology]

FIG. 2 is a sectional view showing a conventional optical coupling device.

A metal carrier (2) on which a light emitting semiconductor element (1) (hereinafter referred to as rLDJ) is mounted, and a metal holder (3)
is the welding point (4a), and an optical fiber (5) whose tip is processed into a spherical shape (hereinafter referred to as "spherical tip fiber") is soldered! The metal sleeve (7) fixed at (6) and the holder (3) are each fixed at the welding point (4b).

It is housed in an airtight container (8).

The reason for using the tipped fiber (5) as the optical fiber is as follows.
This is because the spherical surface at the tip allows the emitted light from the LD (1) to efficiently enter the optical fiber. First ball fiber (5
), the ratio of the power of the light emitted from the LD (1) to the power of the light incident on the tip fiber (5),
In other words, the coupling efficiency is between the LD (1) and the tip fiber (5)
depends largely on the relative position of the Depending on the conditions of L D +1) and the tip fiber (5), the tip fiber (5)
Even if the position with respect to LD (1) is just 1μ away from the position where maximum coupling efficiency can be obtained, the coupling efficiency will decrease significantly.
The practical purpose may not be achieved.

Now, the second assembly procedure consists of the carrier (2) on which the LD (11 is mounted), the sleeve (7) to which the tip fiber (5) is fixed in advance with a hammer (6), and the holder (
3) are held independently, and the relative positions of the LD (11) and the tip fiber (5) are set to the position where the maximum coupling efficiency is obtained!I!
After adjusting.

The sleeve (7) and holder (3) are fixed by welding. At this point, the distance between L D +11 and the tip fiber (5) is fixed.

Next, weld and fix the holder (3) and carrier (2), and
The relative positions of D (1) and the tip fiber (5) should be completely fixed.

The reason why fixing by welding is used here is that it is more reliable than fixing methods using adhesives or solder.

Solder (
61 is used because the tip fiber (5) is taken out of the airtight container (8), so it is necessary to fix the gap between the tip fiber (5) and the sleeve (7) in an airtight manner. be.

Furthermore, the space between the sleeve (7) and the airtight volume N (8) is also airtightly fixed.

[Problem that the invention seeks to solve]

Since the conventional optical coupling device is configured as described above,
When there is a temperature fluctuation, the solder fixed between the tipped fiber and the sleeve will be deformed due to the creep phenomenon, and the relative position of the LD and the tipped fiber will move, thus reducing the coupling efficiency and reducing the optical coupling. There was a problem that the device could no longer be put to practical use.

This invention was made to solve the above-mentioned problems, and even if the solder that fixed the tip fiber and the sleeve is deformed, the relative position of the LD and the tip fiber does not change. The objective is to obtain a stable optical coupling device.

[For production]

In this invention, the tightening and fixing portion of the tipped fiber and the holder can maintain the position of the tipped fiber stably with respect to the holder even if the solder between the tipped fiber and the sleeve is deformed. I can do it.

Moreover, since the holder and the carrier on which the LD is mounted are fixed by welding and are stable, the positional relationship between the tip fiber and the LD is maintained stably.

[Embodiments of the invention]

FIG. 1 shows an embodiment of the present invention. Tip fiber (
5) Hant! (8) to the sleeve (7) and optically coupled to the L D [11 on the carrier (2), the sleeve (7) and the holder (3) are welded and fixed, and the carrier (2) and holder (3) are fixed by welding.

In addition, the tip fiber (5) is attached to a metal holding plate (9).
It is directly tightened and fixed to the holder (3) with screws aO1.

If temperature fluctuations occur, generally [6] is susceptible to deformation due to creep, etc. For this reason, the positional relationship between the tip spherical fiber (5) and the sleeve (7) changes. However, the holding plate (9) and the screws that directly fix the tip fiber (5) and the holder (3) do not deform easily. Further, the holder (3) and the carrier (2) are fixed by welding, and their relative positions do not change due to deformation. From the above, the positional relationship between the L D (1) mounted on the carrier (2) and the tip fiber (5) is stable despite the deformation of the solder (6).

In the above embodiment, the case where the optical fiber is fixed to the holder using the holding plate and screws has been explained, but the same effect can be obtained when using other tightening and fixing means such as welding and fixing the holding plate to the bolt. can get.

〔Effect of the invention〕

As described above, according to the present invention, since the LD and the bulbous fiber are fixed only by welding and clamping, an optical coupling device with stable optical coupling can be obtained.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an optical coupling device according to an embodiment of the present invention, and FIG. 2 is a sectional view showing a conventional optical coupling device. In the figure, (1) is L D , (21 is carrier,
(3) is the Holter p ('a) p (4b) is the welding point,
(5) is a tipped fiber t (6) solder, (7) is a sleeve, (8) is an airtight container, (9) is a holding plate, Qol
is a screw. Note that the same reference numerals in the two figures indicate the same or equivalent parts.

Claims (1)

[Claims] A light emitting semiconductor element, a metal carrier on which the light emitting semiconductor element is mounted, an optical fiber whose tip is processed into a spherical shape and optically coupled to the light emitting semiconductor element, and the optical fiber is fixed using solder. a held metal sleeve; a metal holder welded to the sleeve and welded to the carrier; and at least the above-mentioned 5.
An optical coupling device comprising an airtight container in which an element is housed and one end of which the optical fiber is taken out to the outside, wherein the optical fiber is fastened and fixed to the holder. .