JPH0298986A - Semiconductor laser device - Google Patents

Abstract

PURPOSE:To enable fine adjustment of a position in the directions of X, Y, Z while monitoring optical axis alignment, to reduce irregularity in coupling efficiency with optical fiber, and to improve mass producibility by attaching a wedge type projection and a lens to a cap. CONSTITUTION:A heat sink 2 is assembled on a stem 6 so that a light emitting point of an LD chip 1 aligns with the center axis of the stem 6. A cap 8 is provided with a lens 3 and a wedge type projection 9. Fine adjustment is performed with the cap 8 in directions of X, Y while making the LD emit light, and optical axis alignment is monitored by a photo sensitive device which is arranged in opposition to the lens 3. The cap 8 is fixed at a position whereat the optical axis in the directions of X, Y are aligned with each other. A soldering is performed while monitoring optical axis alignment in a direction of Z axis, with the cap 8 fixed in directions of X, Y. According to this constitution mass producibility can be improved and good coupling efficiency with optical fiber can be acquired.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a semiconductor laser device for optical communication that is used in conjunction with an optical fiber.

[Conventional technology]

FIG. 3 is a sectional view showing a conventional semiconductor laser device.

In the figure, (1) is a semiconductor laser (hereinafter referred to as LD) chip, (2) is a heat sink to which the LD chip (1) is bonded, and this heat sink (2) is a semiconductor laser (hereinafter referred to as LD) chip.
The chip (1) is assembled on the stem A (6) so that its light emitting point coincides with the central axis of the stem (6). (4) is a lens holder fixed to the LD via solder material (5) with its optical axis aligned, and (8) is a cap with a window glass (γ) welded to the stem (6). It is.

Next, the operation will be explained. A light receiving device is installed facing the LD, and a heat sink (
2) With the lens holder (4) installed above, the LD is made to emit light, the lens holder (4) is slightly moved in the X and Y directions, and the optical axis alignment is monitored by the light receiving device.

Rotate the lens holder (4) where the optical axes match.

The lens holder (4) is heated up in the fixed state, and the lens holder (4) is fixed to the heat sink (2) with the solder material (6).

[Problem to be solved by the invention]

Conventional semiconductor laser devices are configured like a stopper, which results in poor work efficiency and poor mass production.
There was a problem that alignment in the axial direction could not be performed and the coupling efficiency with the optical fiber varied greatly.

This invention was made in order to solve the above-mentioned problems, and it has high mass productivity, enables optical axis alignment in the Z-axis direction, has small variations in coupling efficiency with optical fibers, and has good coupling efficiency. The object of the present invention is to obtain a semiconductor laser device that provides the following.

(Means for Solving the Problems) A semiconductor laser device according to the present invention has a cap (8) equipped with a wedge-shaped projection and a lens.

[Effect]

The semiconductor laser device according to the present invention is manufactured by:
Since the position can be finely adjusted in the three directions of X, Y, and Z while monitoring the optical axis alignment, variations in the coupling efficiency with the optical fiber are small, and mass productivity is good.

〔Example〕

Hereinafter, this invention will be explained with reference to the drawings. FIG. 1 is a sectional view showing a semiconductor laser device according to an embodiment of the present invention, and FIG.
The figure is an enlarged view of the main part of FIG. 1, and is constructed as follows.

The LD tube (1) is bonded to the heat sink (2), and the heat sink (2) is assembled to the stem (6) so that the light emitting point of the LD chip (1) matches the central axis of the stem (6). ing. The cap (8) is provided with a lens (8) and a sag-shaped projection (9).

In the above state, the cap (8) is slightly moved in the X and Y directions while the LD emits light, and the optical axis alignment is monitored by a light receiving device installed opposite the lens (8). X,
Fix the cap (8) where the optical axes in the Y direction are aligned. Welding is performed while keeping the beam fixed in the X and Y directions while monitoring the alignment of the optical axis in the Z-axis direction. This welding is performed by melting the tip of the wedge-shaped projection (9) while adjusting the current, and the welding is repeated step by step until the optical axis alignment in the Z-axis direction is completed.

〔Effect of the invention〕

As described above, according to the present invention, since the wedge-shaped projection and the lens are attached to the cap, the optical axis can be aligned in the three directions of x, y, and z, and the optical axis can be aligned in the L direction.
Since the cap can be finely adjusted while monitoring the D light, mass productivity is high and good coupling efficiency with the optical fiber can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a semiconductor laser device according to an embodiment of the present invention, FIG. 2 is an enlarged view of the main part of FIG. 1, and FIG. 3 is a sectional view showing a conventional semiconductor laser device. In the figure, (1) is the LD chip, (2) is the heat sink, (8) is the lens, (6) is the stem, (8) is the cap, (9) is the wedge-shaped projection ring, and (9) is the welding part. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] A semiconductor laser device comprising a laser diode chip assembled to a stem via a heat sink and a cap welded to the stem, characterized in that the cap is equipped with a lens and a wedge-shaped projection ring. Device.