JPH0610328Y2 - Semiconductor module for optical fiber communication - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a semiconductor module for optical fiber communication using a semiconductor laser.

<Prior Art> When performing two-way communication in optical fiber communication, a method of separately transmitting upstream and downstream signals by using two optical fibers and transmitting both upstream and downstream signals with one fiber There is a way to do it. In the latter case, both the light source and the light receiver must be coupled to the end of the optical fiber. An example of this type of transmission / reception module is shown in FIG.

In FIG. 2, the light from the semiconductor laser 11, which is the light source, is
It passes through the beam splitter 12, is condensed by the lens 13, and is sent out to the optical fiber 14. On the other hand, the light transmitted from another transmission / reception module and transmitted through the optical fiber 14 passes through the lens 13, is reflected by the beam splitter 12, and enters the photodiode 15.

<Problems to be Solved by the Invention> However, in a transmission / reception module using such a beam splitter 12, since the directions of transmission light and reception light are at right angles to each other, the size of the entire module becomes large. There was a problem.

The present invention has been made in view of the above points, and an object thereof is to provide a miniaturized transceiver module.

<Means for Solving Problems> Between the semiconductor laser and the photodiode and the optical system including the lens, the transmission light emitted from the semiconductor laser is sent to the optical system, and the received signal passing through the optical system is sent to the photodiode. A diffraction grating for guiding is provided.

<Operation> With the above configuration, the diffraction angle by the diffraction grating is generally small, and the angle formed by the traveling directions of the transmitted light and the received light can be reduced. Therefore, the size of the entire module can be reduced.

<Embodiment> FIG. 1 shows an embodiment of the present invention.

In this example, the semiconductor laser chip 1 and the photodiode chip 2 are mounted on the same mount material. The diffraction grating 3 is arranged between these and the range 4 forming the optical system, and is further optically connected to the optical fiber 5.

In the above description, the transmission light emitted from the semiconductor laser chip 1 passes through the diffraction grating 3, but the zero-order component, that is, the component that passes straight through is transmitted to the optical fiber 5 through the lens 4. On the other hand, the received light transmitted through the optical fiber 5
It is incident on the diffraction grating 3 through the lens 4, but here it is 1
The next diffracted light enters the photodiode chip as received light.

In this way, the angle formed by the transmitted light and the received light can be made small, and in some cases it is possible to mount the semiconductor laser and the photodiode on the same mount material as in the above embodiment, and the size of the entire module can be increased. Can be made smaller, and further downsizing can reduce material costs and assembly costs.

<Effect of the Invention> As described above, according to the present invention, it is possible to provide a small-sized and useful semiconductor module for optical fiber communication capable of transmitting and receiving.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a block diagram showing a conventional example: 1 ... semiconductor laser chip, 2 ... photodiode chip, 3 ... diffraction grating, 4 ... Lens, 5 ... Optical fiber.

Claims (1)

[Scope of utility model registration request] 1. A semiconductor laser, a photodiode, an optical fiber for transmitting an optical signal bidirectionally, an optical system for condensing transmitted and received light, and a semiconductor laser, a photodiode and the optical system. A semiconductor module for optical fiber communication, comprising: a transmission grating emitted from the semiconductor laser, to the optical system, and a diffraction grating for guiding the received light passing through the optical system to the photodiode. .