JPS6281136A - Wavelength multiplex optical receiver - Google Patents

Abstract

PURPOSE:To obtain a simple and inexpensive wavelength multiplex optical receiver by constituting a receiver with a branching device branching N-channel of different wavelengths, an N:1 optical switch selecting N-output of the branching device and an photoelectric converter converting the optical signal being an output of the optical switch into an electric signal. CONSTITUTION:The N-channel electric signal is converted into a different wavelength of optical signals by N-set of electroopic converters 2-1 2-N in an optical transmitter 1, the signals are synthesized by a synthesizer 3, branched into M-set of optical fibers by plural demultiplexer devices 5 provided on the way of an optical fiber 4 while passing through the fiber 4, and each optival fiver is connected to an optical receiver 6. The signal is branched into N-set of wavelength channels by an optical branching device 7, one of optical switches 8 is selected and extracted by an photoelectric converter 9 as the original electric signal.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a wavelength multiplexed optical transmission system for transmitting optical signals of a plurality of different wavelengths through a single source fiber, and more particularly to a wavelength multiplexed optical receiver for the same. It is.

2. Description of the Related Art Conventionally, wavelength division multiplexing optical transmission systems of this type, such as CAT
A receiving device such as the V system includes a demultiplexer that receives a transmitted optical signal and demultiplexes it into multiple different wavelengths, an optical-to-electrical converter corresponding to each optical wavelength, and these components. (!) It had an electrical switch that changed the output of the optical-to-electrical converter. Therefore, the receiving device requires as many optical-to-electrical converters as the number of channels of the optical wavelength to be transmitted. Since this optical-to-electrical converter has a conversion circuit and an amplifier circuit for amplifying the converted 11Ll signal, it has a fairly complicated circuit configuration.

When the number of channels is about 2 to 3 waves, there is not as much of a problem as on the left, but in recent years, light sources with a narrow wavelength width per wavelength and fewer wavelengths f@ have been developed, and the number of wavelength multiplexing is increasing. However, providing as many optical-to-electrical converters as there are channels rarely results in a large scale and high cost.

Problems to be Solved by the Invention The object of the present invention is to provide a wavelength multiplexed light beam which solves the above-mentioned drawbacks, namely, the problem of increased size and cost due to the provision of as many optical-to-electrical converters as the number of channels. The purpose of the present invention is to provide a receiving device.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention has an object of the present invention, in which a receiving device connected to each optical fiber branched by a branching device of a wavelength multiplexed optical transmission line is capable of transmitting N channels of different wavelengths. an N-to-1 optical switch that selects N outputs of this splitter, and an optical-to-electrical converter that converts the optical signal output from this optical switch into an electrical signal. The following configuration is adopted.

Operation Since the present invention uses phosphoric acid as described above, the wavelength multiplexed element from the optical fiber of the transmission line is divided into N channels by the demultiplexer 6.
This output is switched and selected by an N to 1 source switch, and the selected optical wavelengths are both 1F! 1 of 1
It is converted into an electrical signal using several atomic-to-electrical converters.

Example Next, embodiments of the present invention will be described with reference to the drawings.

Referring to FIG. 1, which shows a system configuration diagram of an embodiment of the present invention, a wavelength multiplexed optical receiving device 6 of the present invention includes one branched optical transmission line 4 branched from an optical transmission device 1 by each branching device 5. Connected to the source fiber, optical demultiplexer 7 and source switch 8
and a source-to-electrical converter 9.

In the optical transmitter [1, N channels of electrical signals are
The electrical-to-optical converters 2-1 to 2-N convert the signals into original signals of different wavelengths, which are combined by the multiplexer 3, pass through the same original fiber 4, and connect to a plurality of original signals provided along the way. The optical branching device 5 branches the optical fibers into M optical fibers, each of which is connected to an optical receiver 6.

In the optical receiving device 6, the optical branching device 7 outputs the signal into Nld wavelength channels, the optical switch 8 selects one of them, and the optical-to-electrical converter 9 extracts the signal as the original electrical signal.

Therefore, there is no need for each receiving device to have an optical-to-electrical converter, which is equal to the number of channels, as in the conventional case.
This has the advantage that the device is simple.

Effects of the Invention As explained above, according to the present invention, by using an optical switch after an optical demultiplexer, a simple and inexpensive wavelength-multiplexed optical receiver can be obtained.

[Brief explanation of drawings]

Figure @1 is a system diagram of an embodiment of the present invention. 1... Optical transmitter, 2-1 to 2-N...
・Electricity-optical converter, 3... Optical multiplexer, 4...
... Optical transmission line (original fiber), 5 ... Optical splitter, 6 ... Optical receiver, 7 ... Optical demultiplexer, 8 ... ... Optical switch, 9... Optical-electrical converter.

Claims (1)

[Claims] An optical transmitter that includes a plurality of N electrical-to-optical converters and an optical combiner that combines N-channel optical signals of different wavelengths from these electrical-to-optical converters, and outputs them to a single optical fiber. and a transmission line connected to the one optical fiber and branched into a plurality of M optical fibers by an optical splitter, and connected to each of these branched M optical fibers,
A wavelength multiplexing optical transmission system consisting of an optical demultiplexer that demultiplexes the input into N-channel optical signals, and an optical-to-electrical converter, and M receiving devices that selectively receive N-channel electrical signals. In the receiving device, N of the optical demultiplexer is provided.
An N-to-1 optical switch having N input terminals and one output terminal connected to each of the N optical output terminals is provided, and the output terminal of this optical switch is connected to the optical-to-electrical converter. Features of wavelength multiplexed optical receiver.