JPS58105642A - Space propagation system for optical signal - Google Patents

Abstract

PURPOSE:To improve SN, by arranging plural condensers to condense optical signals propagated through a space from a terminal, and selectively coupling optical fibers connected to the respective condensers with a photodetector. CONSTITUTION:An optical fiber F of which one end is optically coupled with a laser diode LD built in a terminal T is penetrated into a flexible tube CH and opposed to a lens fitted to the top of the tube. Condensers CO1-CO4 are arranged on a ceiling CE and coupled with an exchange EXC through optical fibers F1-F4. Light from the terminal T is penetrated into one of the condensers CO1-CO4 by operating the tube CH. The incident light is inputted to a detector DTE through one of the optical fibers F1-F4 and the exchange EXC and converted into an electric signal. At low SN, the optical signal is projected to other condensers to select a condenser having the highest SN.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Technical aspects of the invention The present invention provides cordless IIK terminals that can be easily moved, especially in offices.

This invention relates to an optical space propagation method for spatially propagating optical signals from a terminal or a center.

(2) Prior art and its problems In this optical space propagation method, the original signal from a terminal installed on the floor is collected by a condenser installed on the ceiling.

However, since there was a one-to-one correspondence between the condenser and the terminal, if a party were to enter the concentrator from the outside, 8A would deteriorate, but communication would have to be carried out even if the S/'H was poor. ◇ The present invention takes these points into consideration, and 87M is a good spatial propagation method'f! (4) Structure of the Invention According to the present invention, the above object is to arrange a plurality of concentrators to condense the original signal propagated through the space from the terminal. However, this is achieved by an optical signal spatial propagation method in which the original fibers connected to the condensers are selectively optically coupled to the light receiving elements.

(5) Examples of the invention The present invention will be explained below based on examples.

The figure shows an embodiment of the present invention, in which on is the ceiling of an office, 001 to 004 are concentrators, and pIY1 to F.

is the original 7 Aipa, nxc is the switch, D is the detector, T
is a terminal, LD is a laser diode, OH is a flexible tube, and LIC is a lens;

First, let's talk about the original signal transmitter of the terminal.

Connect the original fiber F, one end of which is optically coupled to the laser diode LD built into the terminal T, into a flexible chain O.
It passes through the inside of CH and faces the lens Lm attached to the tip of CH.

This makes it possible to change the output direction of the original signal by bending the chip.

On the other hand, on the ceiling O1 there is a condenser 5cox including a lens (not shown).
~004 meeting was installed, and each concentrator 001~C04 and the switch were connected to the original fiber? , ~F4.

The switch RXO and the detector DET are installed on the wall.

Now, to explain the operation, first, with respect to the terminal T, the nearest collector jt, 1iir, in the example shown in the figure, the collector 002 [operate the tube OH so that the lens Lm faces it], and the switch! Optical fiber due to KO? , and detector D
In this state 11, the laser diode LD is driven to emit light. The optical signal from the laser diode passes through the original fiber 1 and is directed to the condenser 002 via the lens LB'j-. At the condenser QO2, the optical signal propagated through the space is condensed and sent to the original fiber. , the optical signal is input to the detector DKT via the switch RXCt-, and is converted into an electrical signal. If 8A is bad when condenser CO2 is selected, the optical signal will be emitted to another concentrator, and the original signal with strong directivity will be emitted if 0 is the best concentrator. In this case, the length of all the original fibers may be set to 4-, and the plurality of original fibers may be optically coupled to the detector. (6) Effects of the Invention As stated above, According to the present invention, the original signal can be emitted to the best condenser for 8/'MO, so that the 8/' MO operation is improved.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing one embodiment of the present invention, and FIG. 2 is a diagram showing a terminal used in another embodiment. In the figure, T is the terminal, 001-(!04 is the concentrator, 1, F, ~
IF4 is the original fiber, RXC is the switch, and DItT is the detector.

Claims (1)

[Claims] A concentrator j' that condenses the original signal propagating through space from the terminal
An optical signal spatial propagation method in which a plurality of e-devices are arranged, and the original fibers connected to the condensers are selectively optically coupled to the light-receiving elements, and the t% value is determined.