JPS6060605A - Optical signal multiplexer and demultiplexer - Google Patents

Abstract

PURPOSE:To eliminate the need for a dichroic mirror and to reduce the number of parts by collimating optical signals of different wavelength from plural light emission diodes through corresponding collimator lenses, and making them incident to the corresponding parts of a condenser lens. CONSTITUTION:The optical signals of different wavelength are emitted by the respective light emission diodes 11-15 and those five kinds of optical signals are collimated by the corresponding collimator lenses 16-20 and made incident to the corresponding parts of the condenser lens 21. The respective signals are refracted by the lens surface 23 of this condenser lens 21 and photodetected in common by an optical fiber placed at the focus position of the lens. Thus, the five kinds of optical signal are multiplexed easily.

Description

[Detailed description of the invention] The present invention relates to an optical signal mixer and splitter.

As shown in FIG. 1, a conventional optical signal mixer converts the light emitted from one light emitting diode 1 into parallel light using a collimating lens 2 and reflects it onto a dichroic mirror 3, and then combines this reflected light with another light emitting diode 4. The light is parallelized by a collimating lens 5 and further transmitted through the dichroic ink mirror 3, and is condensed by a condensing lens 6, and is made to enter a light receiving section such as an original fiber 7. Therefore, both the condenser lens 6 and the dichroic mirror 3 were necessary. Also, half-missy usage) “Ci, 1”’J
.

A mixer that mixes also realizes σn, but in this case,
2 independent '1's Tsu0i 1 with different wavelengths. The limit was only mixed ingredients.

The present invention has been made in view of these circumstances, and provides an optical signal mixer and splitter that eliminates the need for dichroic mirrors, reduces the number of parts, and allows mixing of three or more types of optical signals. The purpose is to

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In FIGS. 2 and 3, a plurality of light emitting units, for example, five light emitting diodes 11, 12, 13, 14, 15, each emitting light of different wavelengths. The five optical signals are collimated into parallel light by five collimating lenses 16° 17.1B and 19.20, and are further incident on an optical fiber 22 as a single light receiving section through a condensing lens 21. A mixture of five types of optical signals is obtained.

The optical fiber 22 is connected to the lens surface 23 of the condenser lens 21.
placed opposite to n. 5 collimating lenses 16~
20, on the opposite side of the original fiber 220 with respect to the condenser lens 21, their positions are shifted so as to face the condenser lens 21. For example, four collimating lenses 16 to 19
are arranged on a virtual circle with central angles set at 90 degrees each, and the remaining collimating lenses 20 are arranged at the center of the virtual circle, that is, at the center position of each of the collimating lenses 16 to 19. . Moreover, each collimating lens 16~
20 denotes each collimating lens 16 to 16 on the outer periphery of the condensing lens.
If projected onto the 20 side, the power is distributed within the range of α.

At the focal position of each collimating lens 16-20, light emitting diodes 11-15 as a light emitting section are arranged facing each collimating lens 16-20. Therefore, the optical signal from each light emitting diode 11-15 is , the parallel light is collimated by the corresponding collimating lenses 16 to 20, and is incident on the condenser lens 21.

Next, to explain the operation of this embodiment, each of the light emitting diodes 11 to 15 emits optical signals with different wavelengths, and these five types of optical signals are converted into parallel light by the corresponding collimating lenses 16 to 2o. Rear, condenser lens 2
1 is input into the corresponding portion of 1. In this condensing lens 21, each original signal is refracted at a lens surface 23, and is received in common at its focal position, that is, at the original fiber 22. Therefore, five types of optical signals are commonly received by the original fiber 22, and mixing of five types of optical signals can be achieved extremely easily.

In the above embodiment, the mixing of five types of original signals has been described, but according to the present invention, by adjusting the diameter of the condenser lens 21, any number of types of optical signals can be mixed extremely easily.

As another embodiment of the present invention, by using the original fiber 22 as a light emitting part and arranging the original fiber or photodiode as a light receiving part in place of each of the light emitting diodes 11 to 15, the apparatus of the present invention can be used as a source signal branch. It can also be used as a container.

As described above, according to the present invention, the single light receiving section or the light emitting section is disposed at the focal position of the condensing lens, facing the lens surface of the condensing lens. On the side opposite to the section, a plurality of collimating lenses for inputting parallel light into the condensing lens or narrowing down the parallel light from the condensing lens are arranged opposite to the condensing lens with their positions shifted from each other. f. At the focal position of each collimating lens, other light emitting parts or light receiving parts are individually arranged facing the corresponding collimating lens, so the conventionally used dichroic mirror is no longer required, reducing the number of parts. At the same time, mixing of three or more types of original signals, which has been difficult in the past, can be achieved extremely easily.

[Brief explanation of the drawing]

FIG. 1 is a layout diagram showing the configuration of a conventional device, FIG. 2 is a layout diagram showing the configuration of an embodiment of the present invention, and FIG. 3 is a diagram showing the arrangement 1σ of the collimating lens. 11-15... Light-emitting diode as a light-emitting part, 16
~20...-"J me-) lens, 21...condensing lens, 22...original fiber as light receiving section, 23.Lens surface patent applicant Toyodenso Co., Ltd.

Claims (1)

[Claims] A single light receiving section or a light emitting section is disposed at the focal point of the lens facing the lens surface of the condensing lens, and a single light receiving section or a single light emitting section is disposed at the focal point position of the lens with respect to the condensing lens. A plurality of collimating lenses for collimating incident light or collimated light from a condensing lens are arranged opposite to the condensing lens with their positions shifted from each other, and the focal position of each collimating lens is , an optical signal mixing characterized in that the other light emitting parts or the light receiving parts are individually arranged facing the corresponding collimating lenses;
Turnout.