JPH0242402A - Simplified light attenuator - Google Patents

Abstract

PURPOSE:To configure a system configuration flexibly and economically by providing several types of liquids of different densities and obtaining an optimum attenuation quantity with one attenuator. CONSTITUTION:The title device consists of vessels 1-4 storing liquids 1a-4a of the different densities provided in contact with light passing spaces 1'-4'. The vessels 1-4 are provided with liquid injecting pins 5-8. That is to say, the liquid 1a-4a of the different densities has different attenuation quantities to passing light. Consequently, in order to obtain the necessary light attenuation quantity, only the liquid of the relevant density or the liquids of the plural densities are combined and injected to the light passing spaces 1'-4'. Thus, it can be made possible to get in the reaction range of a light reception circuit.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an optical attenuator, and more particularly to a simple optical attenuator that obtains a predetermined amount of attenuation in an optical transmission system.

[Conventional technology]

In general, optical transmission type receiving circuits cannot receive light even if the reception level of light is too high or too low, and their response range is limited. Its response range is -18 to -3Q cl
It is about Bm. On the other hand, the transmitting circuit is designed to output as high a level as possible to enable long-distance transmission, and if the optical transmission line is short, the attenuation of the optical transmission line is small and the output exceeds the response range of the receiving circuit. Put it away. At this time, conventionally, an optical attenuator is inserted into the optical transmission line to bring it within the response range.

[Problem to be solved by the invention]

The conventional optical attenuator described above has a fixed attenuation amount,
For example, they are configured individually as 5 dB, 10 dB, and 20 dB, and in order to obtain the optimal attenuation for the transmission path, the optimal attenuation is selected from multiple fixed attenuations, so several types of attenuation are available. This method requires an attenuator, is economical, and has the disadvantage of lack of flexibility in system construction.

[Means to solve the problem]

The simple optical attenuator of the present invention includes a light passage space through which transmitted light passes, a plurality of liquid containers provided in contact with the light passage space, and a liquid container containing different concentrations. and a plurality of liquids injected into the light passage space, each having a concentration corresponding to a required amount of light attenuation.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of the present invention.

This embodiment includes light passing spaces 1', 2', 3', and 4' through which the transmitted light passes from the input side to the output side, and the light passing spaces 1', 2', 3', and 4' that are in contact with the light passing spaces 1', 2', 3', and 4'. Containers 1 each containing liquids 1a, 2a, 3a, and 4a having different concentrations.
, 2, 3.4, and containers 1, 2, 3.4.
are respectively provided with liquid injection bottles 5.6, 7.8.

In this embodiment with such a configuration, the liquids 1a, 2a, 3a, and 4a having different concentrations are liquids that have different attenuation amounts for the light passing through them. It is assumed that the attenuation amount is 20 dB.

Here, if we want to set the amount of attenuation of light passing from the input side to the output side to be 10 dB, we will move the liquid 2a into the light passage space 2'.
You can inject it into. In this injection method, pressure is applied from above using the liquid injection bottle 6, and the liquid is injected through the container 2.

In this way, in order to obtain the necessary amount of light attenuation in this embodiment, a single liquid of the corresponding concentration or a combination of liquids of multiple concentrations should be injected into the light passage spaces 1'2'', 3', and 4'. This achieves the objective and allows it to be within the response range of the optical receiver circuit.

〔Effect of the invention〕

As explained above, the present invention has several types of liquids with different concentrations, and by making it possible to obtain the optimal amount of attenuation with a single sterilization device, the present invention has the advantage that it can be economically constructed and the system configuration can be flexibly constructed. There is.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention. 1.2, 3.4... Container, la, 2a,, 3a. 4a...Liquids with different attenuation amounts, 5, 6, 7.8...
Liquid injection bottle, 1' space. 2'3'4'... Light passage

Claims (1)

[Claims] A light passing space through which the transmitted light passes; a plurality of liquid containers provided in contact with the light passing space; A simple optical attenuator comprising a plurality of liquids having corresponding concentrations injected into the light passage space.