JPS5810368Y2 - optical coupler - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an optical coupler that can directly connect a fiberless optical semiconductor element and an optical transmission fiber.

Conventionally, in order to connect a fiberless optical semiconductor element and an optical transmission fiber, as shown in FIG. .25, and the surface coupling element was coupled by a coupling nut 26.

In the figure, 20 is a circuit package.

Conventionally, there has been a problem that it is difficult to align the optical semiconductor element 21 and the fiber 22 when they come into contact, resulting in deterioration of the characteristics. We had no choice but to adopt the configuration shown in Figure 1.

However, when the optical semiconductor element 21 is used as a light-receiving element, it is not necessary to attach the fiber 22 to the optical semiconductor element 21 in advance because the alignment accuracy is sufficient as long as the fiber is located on the semiconductor element surface.

The purpose of the present invention is to provide an optical coupler that takes this point into consideration.In order to further achieve this objective, two concentric holes, one large and one small, are provided in the coupling sleeve. The structure is such that a fiberless optical semiconductor element can be fitted into the large hole, and an optical transmission fiber holder can be fitted into the small hole without play.

Next, embodiments of the present invention will be described with reference to FIGS. 2 to 4.

In FIG. 2, reference numeral 1 denotes an optical coupler, and the optical coupler 1 includes a coupling sleeve 2, a fixing screw 4 that is screwed into a threaded portion 3 on the inner wall of the coupling sleeve 2, and a mechanism for tightening the fixing screw 4. It consists of an optical semiconductor device 5 fixed to a coupling sleeve 2 by.

As shown in detail in FIG. 3, the coupling sleeve 2 has a threaded portion 3 on one side and a hole 7 into which the optical semiconductor device 5 is fitted and inserted, and a hole 7 concentrically with the hole 7 from the other side. The inner periphery is smaller than that of the optical fiber holder, and has a hole 6 into which a fiber holder 12 holding an optical transmission fiber is fitted and inserted, and a threaded portion 8 on the outer periphery.

Further, the optical semiconductor device 5 is concentrically fitted and fixed to a retaining ring 9, as shown in detail in FIG.
is protected by a glass plate 11.

The outer diameter of the retaining ring 9 is sized to fit into the hole 7 of the coupling sleeve 2 without play, so that the optical semiconductor device 5 is
The center of the light receiving source 10 coincides with the center of the hole 6 when it is assembled into the coupling sleeve 2 as shown in the figure.

The optical semiconductor device 5 incorporated in such an optical coupler 1 and the optical transmission fiber 23 are connected as follows.

That is, as shown in FIG. 2, the optical transmission fiber 23 is inserted and fixed into the center hole 13 of the fiber holder 12, which has an outer diameter that fits into the hole 6 of the coupling sleeve 2 without play, and the fiber 23 is fixed. The tool 12 is inserted into the hole 6 until its distal end surface contacts the glass plate 11, and the connection is made.

Although not shown, the fiber holder 12 is fixed by an optical coupling element that holds the fiber holder 12 and a coupling sleeve 2.
are tightened and fixed by a coupling nut screwed into the threaded portion 8 of the coupling sleeve 2.

In this case, as mentioned above, the center of the light receiving source 10 coincides with the center of the hole 6, so the optical transmission fiber 23 in the center of the fiber holder 12, which fits into the hole 6 without play, is connected to the optical semiconductor device 5. Connected concentrically.

As explained above, the present invention provides a first
a fiber holder 12 that is concentric with the hole 7 and has a smaller inner circumference than the hole 7 and holds the optical transmission fiber 23.
A coupling sleeve 2 having a second hole 6 for inserting the threaded part 8 on the outer periphery, and a first hole 7 of the coupling sleeve 2.
an optical semiconductor device 5 that is inserted into the optical fiber 23 to be optically coupled to the optical transmission fiber 23; and a fixing screw that is screwed into the threaded portion 3 of the first hole 7 to fix the optical semiconductor device 5 to the first hole 7. 4, an optical semiconductor device 5 and an optical transmission fiber 2.
It becomes easy to align the optical axes with 3 and connect them, and the connection can be easily performed without deteriorating the optical characteristics.

Furthermore, it has the advantage of being simple in structure and easy to manufacture.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of a connection procedure between a conventional fiberless optical semiconductor element and an optical transmission fiber. 2 to 4 show an embodiment of the optical coupler according to the present invention, in which FIG. 2 is a front sectional view, FIG. 3 is a detailed view of the coupling sleeve, and FIG. 4 is an explanation of the optical semiconductor device. It is a sectional view of the main part. In the figure, 1 is an optical coupler, 2 is a coupling sleeve, 3 and 8 are screw parts, 4 is a fixing screw, 5 is an optical semiconductor device, 6 and 7 are holes, 1
2 is a fiber holder, and 23 is an optical transmission fiber.

Claims (1)

[Scope of utility model registration request] A first hole having a threaded portion on one side and into which an optical semiconductor device is fitted and inserted; and a first hole from the other side that is concentric with the first hole and has a smaller inner circumference than the first hole for optical transmission. a second hole into which a fiber holder holding the fiber is fitted and inserted, and a coupling sleeve with a threaded portion on the outer periphery; a coupling sleeve which is fitted and inserted into the first hole and optically coupled with the optical transmission fiber; an optical semiconductor device in which the optical semiconductor element is located concentrically with the hole as shown in FIG. An optical coupler characterized by comprising: