JPS5892157A - System for space propagating of optical signal - Google Patents

Abstract

PURPOSE:To make the adjustment of light output direction easy, by collecting and synthesizing optical signals outputted spreadably from a terminal with a plurality of light collectors. CONSTITUTION:An optical signal is transmitted from a terminal 4 with a certain spread an incident to a plurality of light collectors near the upper side of the terminal 4, out of light collectors 2-1-2-n at a ceiling 1. In this case, the length of fibers F1-Fn connecting the collectors 2-1-2-n an a light synthesizer 7a are made equal with each other. Thus, outputs of each collector receiving the optical signal reach the synthesizer 7a at the same time, and the synthesized light is led to a photodetector 7b.

Description

Detailed Description of the Invention (1) Technical Field of the Invention The present invention relates to an optical signal spatial propagation system that transmits and receives optical signals through space in order to make terminals cordless and to facilitate the movement of terminals. It is about improvement.

(2) Background of the Technology Recently, when a terminal used in an office is moved due to a layout change or the like, a spatial propagation method has been adopted in order to omit cable installation work.

(3) Prior Art and Problems This spatial propagation method will be explained with reference to FIG. 1. For example, a condenser 2 is installed on the ceiling 1 of an office, and a terminal 4 is installed on the floor 3.

The condenser 2 is connected to a light receiving element 6 through a light 7 eyeper 5. When transmitting data from the terminal 4, an optical signal is projected toward the condenser 2.

In the space propagation method such as 0 or more, in which a part of the projected optical signal enters the condenser 2 and is guided to the light receiving element 6 by the optical fiber 5, there is no need to install a cable when moving the terminal. On the other hand, it is easy to move because of the
When the terminal moves, it becomes necessary to adjust the output direction of the optical signal from the terminal.In order to make this adjustment easier, the optical signal from the terminal should be diffused. However, in order to ensure the minimum reception level of the light-receiving element, an unnecessary large output is required, and safety for the eyes 1 Lifespan of the light-emitting element, reliability 8 Price, il
There was a problem with selectivity.

(4.Object of the invention) The present invention aims to eliminate such drawbacks.

(6) Structure of the Invention According to the present invention, an optical signal from a terminal is incident on a condenser through space, the condenser collects the light, and the optical signal is received via an optical fiber. In the spatial propagation method in which optical signals are guided to an element, a plurality of such condensers are arranged side by side, and the outputs of all the concentrators are combined by a light combiner, and the optical signal that spreads from the terminal is (6) Embodiments of the Invention The present invention will be described below. An explanation will be given based on an example.

Figure 2 is a diagram showing an example of non-invention, and 2-1 to 2-2 in the figure
-n is a condenser, F1%Fn is an optical fiber, 1 is a receiver, and the same parts as in Fig. 1 have the same numbers. Figure 3 is a diagram showing details of the receiver, and 7a is a diagram showing details of the receiver. In the photosynthesizer, 7b indicates a light receiving element. Here, optical signals are transmitted from the terminal number with a certain degree of spread. A plurality of light concentrators 2-1 are installed on the ceiling 1.
.about.2-n are arranged, the optical signal enters several concentrators near the top of the terminal number. Here, concentrator 2-
1 to 2-n and the optical fiber F1 to which the light combiner 7ai is coupled
Make all IFn lengths the same.

As a result, the light traveling signals are incident on a plurality of condensers and simultaneously reach a light combiner F a, where they are combined and guided to a light receiving element 7b.

(η Effects of the invention As stated above, according to the invention, the spread optical signals from the terminal are collected and synthesized by a plurality of condensers, so when a beam light is used It is easier to adjust the direction of light output compared to the above method.Furthermore, since the optical signal is given a certain degree of spread and is not diffused, all of the drawbacks of diffusion can be eliminated.

[Brief explanation of the drawing]

Figure 1 is a diagram to explain the optical signal space propagation method, Figure 2
The figure shows an embodiment of the present invention, and FIG. 3 is a diagram showing details of the receiving section.

Claims (1)

[Claims] In an optical signal space propagation method, an optical signal from a terminal is incident on a condenser through space, the condenser collects the light, and the nine optical signals are guided to a light receiving element via an optical fiber. , a plurality of these condensers are arranged in parallel, and the outputs of all the condensers are combined by a light combiner, nine optical signals with a spread are emitted from the terminal, and the outputs of each concentrator are combined. An optical signal spatial propagation method characterized in that the optical signal is guided to the light receiving element.