JPS6029260B2 - Optical fiber communication method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION '1) Field of Application of the Invention The present invention relates to a method of configuring a wired communication system using optical fibers.

{2) Prior Art In conventional wired communication systems, for example telephones, a wire is used to connect a telephone office to a telephone in a home.

Similarly, in wired communication using optical fiber, the transmitter is connected to the receiver using the optical fiber. However, when wiring optical fibers inside a building or home, it may be necessary to bend the optical fibers with a small radius of curvature, or shearing force or stretching force may be applied to the optical fibers. Optical fibers are easily damaged by the above-mentioned forces, and their characteristics deteriorate. To prevent these, optical fibers are generally coated with a strong jacket material or sometimes further reinforced with metal wire. Even with these reinforcements, it is not possible to completely eliminate the deterioration of the characteristics of the optical fiber, and there are disadvantages in that it is not possible to completely eliminate the possibility of breakage. Moreover, these reinforcements increase the cost of the optical fiber as a whole, which undermines the low cost characteristic of the material of the optical fiber body. '31 OBJECTS OF THE INVENTION An object of the present invention is to compensate for the drawbacks of optical fibers and to provide a wired communication system that is easy to handle and has stable characteristics.

■ General description of the invention The present invention is a communication method using optical fiber, in which an optical conversion part (electrical-
The optical conversion section (or optical-to-electrical conversion section) and the terminal section are separated, the optical conversion section is installed outdoors, and the terminal section indoors is connected with an electric wire.

{5} Examples Hereinafter, the present invention will be explained in detail with reference to Examples.

FIG. 1 is a diagram in which the present invention is implemented on a transmitting side and a receiving side. There is an electrical-to-optical converter 4 outside the building 1, and an optical-to-electrical converter 6 outside the building 2. The converters 4 and 6 are connected by an optical fiber 3. They are connected to indoor terminal devices 5 and 7 by electric wires 6 and 9, respectively. According to this embodiment, electric wires are used for indoor wiring in buildings 1 and 2, which are less likely to be damaged than optical fibers, and whose characteristics are less likely to deteriorate due to bending, so that they are easy to handle and have stable characteristics.
FIG. 2 shows an embodiment in which the present invention is applied to the receiving side in, for example, public communication.

Several optical fibers are taken out from the trunk cable 10 in which a plurality of optical fibers are connected to the east, and a light-electric conversion device 6 corresponding to those optical fibers is installed on a utility pole 11, for example, and the conversion device 6 is and a terminal device 7 located in each individual's home are connected by an electric wire 9. In addition to the drawbacks mentioned above, optical fibers have the disadvantage that connecting optical fibers together is not as easy as connecting electric wires because their diameters are very small and precision is required. However, when an optical fiber is brought into each individual's home as in public communication, it becomes necessary to connect the optical fiber for introduction to the optical fiber in the trunk cable 10. However, according to this embodiment, since the optical-to-electrical converter 6 is installed right next to the trunk cable, there is an advantage that there is no need to connect optical fibers together. Although Fig. 2 shows the case where the trunk cable 10 is an overhead cable, if the trunk cable is an underground cable, the same effect as in this embodiment can be obtained by installing the optical power converter inside the manhole. is clear. It is clear that the indoor wiring of this embodiment has the same advantages as the embodiment shown in Fig. 1, and therefore, in this embodiment as well, depending on the case, the lead-in optical fiber may be branched from the main cable to connect it directly to the building. A photoelectric conversion device may be installed outside. (6}
Summary As explained above, according to the present invention, electric wires are used in place of optical fibers, which tend to deteriorate in characteristics due to external stress and are difficult to connect to indoor wiring in buildings, and are difficult to connect. It is also possible to realize a stable wired communication method.

[Brief explanation of drawings]

FIGS. 1 and 2 are diagrams showing a method of configuring a wired communication system embodying the present invention. In FIG. 1, 3 is an optical fiber, 4 is an electrical-to-optical converter, 5 is a transmitter terminal device, and 8 is an electric wire. In FIG. 2, 10 is a main cable including a plurality of optical fibers. In FIGS. 1 and 2, 6 is a photoelectric conversion device;
7 is a receiving side terminal device, and 9 is an electric wire. 1 diagram x 2 diagrams

Claims (1)

[Claims] 1. In a communication system using optical fiber, an optical-to-electrical converter on the receiving side is installed outdoors, and the optical-to-electrical converter is connected to a terminal device indoors using an electric wire, or an electric-to-optical converter is installed on the transmitting side. An optical fiber communication system characterized in that a device is installed outdoors and the electrical-to-optical conversion device is connected to a terminal device indoors using an electric wire, or the above-mentioned technology is applied to both the receiving and transmitting sides.