JPH01129543A - Optical communication equipment - Google Patents

Abstract

PURPOSE:To constitute an economical optical reception part consisting of the smallest number of optoelectric converters by selecting only a desired light signal among light signals which are wavelength-multiplexed by the optical reception part and converting only the selected light signal into an electric signal. CONSTITUTION:Respective electric signals outputted by signal sources 9(1)-9(N) are converted by light sources 10(1)-10(N) into light signals with wavelengths lambda1-# l(N), which are inputted to an optical coupler 12 through input optical fibers 11(1)-11(N); and the optical coupler multiplexes them and the composite light is sent to optical reception parts 14(1)-14(N) through output optical fibers 13(1)-13(M). The respective reception parts are equipped with optical tubes 15(1)-15(M) and only desired light signals are selected among the light signals which are wavelength-multiplexed and sent to the optical reception parts and then converted into electric signals by the optoelectric converters O/E 16(1)-16(M).

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an optical communication device using an optical coupler.

Conventional technology Optical couplers are often used in star-type optical LANs or for optical distribution when transmitting to a large number of subscribers.In recent years, various optical couplers and various systems using optical couplers have been developed. is proposed.

The optical coupler functions as a splitter that distributes a plurality of optical signals with different wavelengths to a plurality of output sections.

A conventional optical communication device using these functions has the configuration shown in FIG. 2, for example.

Multiple signal sources 1 (1), 1 (2),...
, 1(N) are output from light sources 2(1'), 2(2), . . . each having a different wavelength.
, 2CN) respectively. λ2゜・・・・・・、
It is converted into an optical signal of λN. Each optical signal λ1゜λ2.・・・
..., λN are the input optical fibers 3' (1) and 3, respectively.
(2), . . . , 3 (N) and then to the optical coupler 4.

In the optical coupler 4, each optical signal λ1. λ2. River..., λN
is wavelength-multiplexed, and the wavelength-multiplexed optical signal is
Output optical fiber s (I>, s (2),...
, 5(M). A wavelength multiplexed optical signal is
Each optical receiver 6 (1), 6 (
2L..., transmitted to 6(M). Each optical receiver has a demultiplexer 7 (IL7(2),..., 7(M
) and optical/electrical converter (abbreviated as O/E in the diagram)
8 (IL 8 (2),..., 8 (M)), and each wavelength-multiplexed optical signal transmitted to each receiving section is divided into each wavelength by each demultiplexer. λ1.λ2
．． ......, is demultiplexed into λN optical signals, and further optical/
Each signal was converted into an electrical signal by an electrical converter. (For example, Japanese Patent Application No. 147348/1983).

Problems to be Solved by the Invention In a conventional optical communication device as shown in FIG. The optical signal is split into two, and each optical signal is converted into an electrical signal by an optical/electrical converter. However, for example, when information such as a television video signal is transmitted to each receiver with one channel assigned to each wavelength, the number of optical signals of the wavelength that you actually want to receive is limited, and optical/electrical conversion is required. The configuration in which all optical signals are converted into electrical signals by a device and the desired signals are then selected has the problem of being wasteful and inefficient in terms of cost.

The present invention provides an optical communication device that eliminates the above problems.

Means for Solving the Problems In order to solve the above problems, the optical communication device of the present invention includes:
The optical receiver is equipped with an optical tuner that can select only the desired optical signal from among the wavelength-multiplexed optical signals transmitted to the optical receiver, and only the selected optical signal is sent to the optical receiver by an optical/electrical converter. It converts it into a signal.

Effect: By the above means, it is possible to construct a small and economical optical receiving section in which the number of optical/electrical converters is minimized.

Embodiment Hereinafter, an optical communication device according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a system configuration diagram showing an embodiment of the present invention.

Multiple signal sources 9 (1), 9 (2),...
, 9(N), each electrical signal output from the light source 10 (
1), 10 (2),...

10(N), the wavelength λ1. λ2.・・・・・・
. , λN, and each optical signal is connected to the input optical fiber 11 (1) , 11 (2) , . . .
..., is input to 11(N). Each optical signal λ1. λ2
．． ......, λN are respectively input to the optical coupler 12 via human-powered optical fibers, wavelength-multiplexed in the optical coupler, and the wavelength-multiplexed optical signals are sent to a plurality of output optical fibers 13 (1 ), 1.3 (2).

・・・・・・Distributed to 13(M). The wavelength-multiplexed optical signal passes through each output optical fiber to each optical receiver 14(1), 14(,2),...
14(N). Each optical receiver has an optical tuner 15 (1), 15 (2), . . .
....

15 (M), which selects only the desired optical signal from among the wavelength-multiplexed optical signals transmitted to the optical receiving section, and selects only the desired optical signal from among the wavelength-multiplexed optical signals transmitted to the optical receiving section. ) 16
(1), 16(2), . . . , 16(M), each of which is converted into an electrical signal.

Effects of the Invention The present invention has a configuration in which only a desired optical signal is selected from among wavelength-multiplexed optical signals in an optical receiving section, and only the selected optical signal is optically/electrically converted. Compared to a configuration in which optical/electrical conversion is performed on each of the demultiplexed optical signals, an economical optical receiving section can be constructed in which the number of optical/electrical converters is minimized.

Furthermore, this also leads to miniaturization of the optical receiver.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an optical communication device according to an embodiment of the present invention, and FIG. 2 is a block diagram of a conventional optical communication device. 9 (L), 9 (2),..., 9 (N)・
...Signal source, 10(,1). 10 (2) ,..., 10 (N)...
...Light source, 12...Optical coupler, 15 (1)
, 15 (2) ,..., 45(M)...
...Optical tuner.

Claims (1)

[Claims] an optical transmitter comprising a plurality of signal sources to be transmitted and a light source that converts each of the signal sources into optical signals having different wavelengths;
an optical coupler that multiplexes each optical signal output from the light source and distributes it to a plurality of output parts; and a demultiplexer and demultiplexer that demultiplexes each optical signal distributed from the optical coupler into optical signals of each wavelength. and an optical receiving section equipped with an optical/electrical converter that converts optical signals of each wavelength into electrical signals, and the optical receiving section includes an optical tuner that can select only optical signals of desired wavelengths as a demultiplexer. and an optical/electrical converter that converts a selected optical signal into an electrical signal.