JPS63169134A - Duplicated multiplexer/demultiplexer type single core two-way optical transmission equipment - Google Patents

Abstract

PURPOSE:To improve the operability and to reduce cost by switching an input electrical signal by a first switch circuit then inputting it, and switching an output electrical signal by a second switch circuit then outputting it. CONSTITUTION:In the titled transmitter which executes two-way multiplex transmission of an optical signal by using a single core fiber, the switch circuits 30-11, 30-12, 30-21, 30-22 are switched by using two pieces of optical transmitters 20-1, 20-2 of the same constitution and the single core optical fiber 21. Therefore, the transmitters 20-1, 20-2 mutually have interchangeability because two optical signals of wavelengths 1, 2 can be multiplex-transmitted in both directions, hence one kind of transmitters only are necessary to be prepared. As a result, the operability can be improved, and the cost of the system can be reduced. Also, by containing the components of the optical transmitters 20-1, 20-2 respectively in one module, the transmitters can be miniaturized.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a double-multiplex/branch-talk single-fiber bidirectional optical transmission device that performs multiplex bidirectional transmission of optical signals using a single-fiber optical fiber. be.

(Conventional technology) Conventionally, as a technology in this field, the 1985 IEICE General Conference, Yasuaki Tamura et al. r 2656
Bidirectional transmission multiplexer/demultiplexer with built-in light emitting and light receiving elements JP,
There was one described in 10-356. The configuration will be explained below using figures.

FIG. 2 is an optical transmission system diagram showing a configuration example of a conventional optical transmission device and an example of its use. This optical transmission system includes first and second optical transmission devices j-1 and 1-2, and both optical transmission devices 1-1 and 1-2 are connected to each other by a single-fiber optical fiber 2. The first optical transmission device 1-1 includes an electrical/optical converter (
Elo) 10-1, outputs an optical signal of λ2 as an electrical signal So
an optical/electrical converter (0/E) 11-1 for converting wavelengths λ1. It is composed of an optical multiplexer/demultiplexer 12-1 that multiplexes and demultiplexes optical signals of λ2.

Similarly, the second optical transmission device 1-2 receives the input electrical signal SiB
An electrical/optical converter (Elo
)10-2, outputs an optical signal of wavelength λ1 as an electrical signal SoB
an optical/electrical converter (0/E) 11-2 that converts the wavelength λ1. It is composed of an optical multiplexer/demultiplexer 12-2 that multiplexes and demultiplexes optical signals of λ2.

In the above configuration, when the input electrical signal SiA is supplied to the first optical transmission device 1-1, the input electrical signal SiA
is converted into an optical signal with a wavelength λ1 by the electrical/optical converter 10-1, which is transmitted to the second optical transmission device 1-2 through the optical multiplexer/demultiplexer 12-1 and the optical fiber 2. The optical signal of wavelength λ1 transmitted to the second optical transmission device 1-2 side is an optical/
The electrical converter 11-2 converts it into an electrical signal, which is output in the form of an output electrical signal SoB. Further, when the input electrical signal SiB is supplied to the second optical transmission device 1-2, the input electrical signal SiB is transmitted to the electrical/optical converter 10-2 with a wavelength λ
It is converted into an optical signal of 2, which is transmitted to the first optical transmission device 1-1 side through the optical multiplexer/demultiplexer 12-2 and the optical fiber 2, and optical/electrical conversion is performed through the optical multiplexer/demultiplexer 12-1 there. The output electric signal SOA is converted into an output electric signal SOA by the converter 11-1, and is output. In this way, one optical fiber 2 was used to perform two-wave multiplexed bidirectional transmission of wavelengths λ1 and λ2.

(Problems to be Solved by the Invention) However, in the device with the above configuration, the transmission light wavelength of the first optical transmission device 1-1 is λ1, and the wavelength of the transmission light of the first optical transmission device 1-1 is λ1,
Since the transmission light wavelength of -2 is λ2 and the wavelengths are different, there is no compatibility between the first and second optical transmission devices 1-1 and 1-2, which is disadvantageous and inconvenient.

The present invention provides a dual-polymerized and demultiplexed single-fiber bidirectional optical transmission device that solves the problem of incompatibility that the prior art had.

(Means for Solving the Problems) In order to solve the above-mentioned Z-point problem, the present invention provides a double-multiplexed, demultiplexed, single-fiber bidirectional optical fiber that performs bidirectional multiplex transmission of optical signals using a single-fiber optical fiber. In a transmission device, the device transmits at least an input electrical signal to a first . The first . a second electrical/optical converter; The first .
a second optical/electrical converter, and a first electrical/optical converter that performs demultiplexing and multiplexing of the optical signals of the first and second wavelengths to the first electrical/optical converter and the first optical/electrical converter. an optical multiplexer/demultiplexer, and a second optical multiplexer/demultiplexer that performs demultiplexing and multiplexing of the optical signals of the first and second wavelengths to the second electrical/optical converter and the second optical/electrical converter. a splitting means for distributing the input and output lights of the first and second optical multiplexers and demultiplexers to a single-core optical fiber;
a first switch circuit that switches and supplies electricity to the electrical/optical converter side of the first switch circuit; A second switch circuit switches and outputs the output electrical signal of the second optical/electrical converter.

(Function) According to the present invention, since the double-multiplexed waveform one-fiber bidirectional optical transmission device is configured as described above, the first switch circuit switches the input electric signal and sends it to the first or second one. 2 to an electrical/optical converter, which converts the first wavelength or the second wavelength.
output an optical signal having a wavelength of . The second switch circuit selects and outputs the output electrical signal photoelectrically converted by the first or second optical/'electrical converter. This first. By switching the second switch circuit, it is possible to make the optical transmission devices compatible, and bidirectional transmission can be performed using one type of optical transmission device. Therefore, the above-mentioned problem can be eliminated.

(Example) FIGS. 1 (1) and (2) are optical transmission system diagrams showing the configuration and usage example of a double-polymerized, demultiplexed, single-fiber bidirectional optical transmission device according to an example of the present invention, (1) in the same figure is the wavelength λ
1 shows a system for transmitting an optical signal of wavelength λ2 to the right and a system for transmitting an optical signal of wavelength λ2 to the left, and FIG. 2(2) shows a transmission system for the opposite direction.

In FIG. 1 (1), a double-combined, demultiplexed, single-fiber bidirectional optical transmission device 20-1 is connected to a single-fiber optical fiber 21, and a first... Second switch circuit 30-11゜30-12
, 1st. Second electrical/optical converter (Elo) 31-11
゜31-12, 1st. A second optical/electrical converter (Elo
)32-11°32-12, 1st. The second optical multiplexer/demultiplexer 33-11, 33-12 and distribution are provided with, for example, an optical switch 34-1 as means, and are housed in, for example, one module.

1st. The second switch circuits 30-11 and 30-12 are composed of transistors, etc., and the first switch circuit 30-11 switches the input electric signal SiA to the first or second electric/optical converter 31-11. , 31-12, and the second switch circuit 30-12 is a circuit that switches the output side of the first or second optical/electrical converter 32-11, 32-12 and outputs the output electrical signal SoA. be. 1st. Second electrical/optical converter 31-11, 31-1
2 converts the input electrical signal SiA into a wavelength λ1. 1. What converts each into an optical signal of λ2. Second optical/electrical converter 32
-11, 32-12 are wavelengths λ1. It converts each optical signal of λ2 into an output electric signal SoA, and the first
The electrical/optical converter 31-11 and the first optical/electrical converter 32-11 are connected to the first optical multiplexer/demultiplexer 33-1, and the second electrical/optical converter 31-12 and the second The optical/electrical converter 32-12 is connected to the second optical multiplexer/demultiplexer 33-12.

1st. The second optical multiplexer/demultiplexer 33-11, 33-12 is for multiplexing or demultiplexing optical signals, and the optical switch 34-
Connected to 1. The optical switch 34-1 distributes the input and output lights of the first and second optical multiplexers/demultiplexers to the single-core optical fiber 21 in response to a switching control signal.

When configuring a bidirectional two-wave multiplex transmission system using the optical transmission device 20-1 as described above, the optical transmission device 20-
An optical transmission device 20-2 having the same structure as 1 is connected to the optical fiber 21. This optical transmission device 20-2 has an input electrical signal S
a first switch circuit 30-21 that switches i8;
a second switch circuit 30-22 that switches the output electrical signal SoB; Second electrical/optical converter (Elo)
31-21.31-22, 1st. 2nd optical/electrical converter (0/E) 32-21.32-22, 1st. It is composed of second optical multiplexer/demultiplexers 33-21, 33-22, and an optical switch 34-2.

FIG. 1 (2) is a configuration diagram of the same bidirectional two-wave multiplex transmission system as in FIG. 1 (1), in which the optical transmission device 20-1
-2 switch circuits 30-11, 30-12, 3
0-21.

An example is shown in which optical transmission is performed in the opposite direction to that shown in FIG. 1 (1) by switching between 30 and 22.

FIG. 3 is a perspective view showing a mounting example of one of the optical transmission devices 20-1 and 20-2 in FIG. 1, for example.

This optical transmission device 20-1 includes a switch circuit 30-11
.

30-12, electrical/optical converter 31-11, 31-1
2, optical/electrical converters 32-11, 32-12, optical multiplexer/demultiplexer 33-11, 33-12, and optical switch 3
4-1 is composed of an opto-electronic integrated circuit (OEIC) and is formed on the substrate 40.

First, the operation shown in FIG. 1(1) will be explained.

The input electric signals SiA and SiB are set to wavelengths λ1. In the case of bidirectional multiplex transmission in the form of an optical signal of λ2, the first switch circuit 30-11 of one optical transmission device 20-1 is connected to the first electricity/rice exchanger 31-11 side, and the second switch circuit 30
-12 to the first optical/electrical converter 32-11, and the first optical transmission device 20-2 of the other optical transmission device 20-2.
The switch circuit 30-21 of the second electrical/optical converter 31
-22 side and the second switch circuit 30-22 to the second optical/electrical converter 32-22 side, and input electrical signal SiA to one optical transmission device 20-1. SiB is supplied to the other optical transmission device 20-2.

Input electrical signal S supplied to one optical transmission bag 220-1
iA passes through the first switch circuit 30-11, is converted into an optical signal of wavelength λ1 by the first electrical/optical converter 31-11, and is then sent to the first optical multiplexer/demultiplexer 33-11 and the optical switch 34-.
1 and is sent out to the optical fiber 21. optical fiber 21
The optical signal of wavelength λ1 transmitted through the optical transmission device 2
0-2, and passes through the optical switch 34-2 and the second optical multiplexer/demultiplexer 33-22 to the second optical/electrical converter 32-.
After being converted into an output electric signal SoB at 22, it is output to the outside through a second switch circuit 30-22.

Further, the input electrical signal SiB supplied to the other optical transmission device 20-2 passes through the first switch circuit 30-21 and is converted into an optical signal of wavelength λ2 by the second electrical/optical converter 31-22. , the second optical multiplexer/demultiplexer 33-22 and the optical switch 34-2, and then sent to the optical fiber 21.

The optical signal of wavelength λ2 in the optical fiber 21 enters one optical transmission device 20-1, passes through the optical switch 34-1 and the first optical multiplexer/demultiplexer 33-11, and then passes through the first optical/electrical converter 32-1.
11, it is converted into an output electrical signal SO^, and is output to the outside through a second switch 30-12. This results in 2
Bidirectional transmission of human-powered electrical signals SiA and SiB is performed.

Next, the operation in FIG. 1(2) will be explained.

The input electrical signals seA, sia are set to wavelengths λ2. When performing bidirectional multiplex transmission in the form of optical signals of λ1, the first . Second switch circuit 30-11.

30-12, and the first optical transmission device 20-2 of the other optical transmission device 20-2. Second
The switch circuits 30-21 and 30-22 are switched in the opposite direction to that shown in FIG. 1(1). One optical transmission device 2
The input electrical signal SiA given to 0-1 is passed through the first switch 30-11 to the second electrical/optical converter 31-1.
2, the optical signal is converted into an optical signal with a wavelength λ2, and the optical signal is sent to the optical fiber 21 through the second optical multiplexer/demultiplexer 33-12 and the optical switch 34-1, and then sent to the other optical transmission device 20.
-2 optical switch 34-2 and first optical multiplexer/demultiplexer 33
-21, the first optical/electrical converter 32-21 converts it into an output electrical signal So8, and the second switch circuit 30-
22. Similarly, the other optical transmission device 2
The input electric signal SiB given to the device 0-2 is
-2 into an optical signal of wavelength λ1, the optical fiber 2
Output electrical signal S at one optical transmission device 20-1 through 1
It is converted into oA and output.

In this embodiment, two optical transmission devices 20-1゜2 having the same structure are used.
Switch circuits 30-11, 30-12, 30-21, 30-2 using the optical fibers 0-2 and 1-core optical fiber 21
By switching wavelengths λ1 . Since optical signals of λ2 can be multiplexed in both directions, the optical transmission device 20-1.20
-2 is compatible, you only need to prepare one type,
This makes it possible to improve usability and reduce system costs. Furthermore, if the components of each optical transmission device 20-1 and 20-2 are accommodated in one module,
Each of the devices 20-1 and 20-2 can be made smaller.

Moreover, if the optical transmission devices 20-1 and 20-2 are constructed of opto-electronic integrated circuits as shown in FIG. 3, not only can the device be made smaller, but also higher accuracy and lower cost can be achieved.

FIGS. 4(1) and 4(2) are optical transmission system diagrams showing the configuration and usage example of a double-multiplexer-type single-fiber bidirectional optical transmission device according to another embodiment of the present invention, and FIG. (1) is a system for transmitting an optical signal of wavelength λ1 to the right and an optical signal of wavelength λ2 to the left, as in Fig. 1 (1); Similarly to FIG. 2), transmission systems in the opposite direction to FIG. 1(1) are shown.

4(1) and (2), the double-multiplexer type single-fiber bidirectional transmission devices 20-11 and 20-22 are the optical switch 34 in the optical transmission device 20-1 and 20-2 of FIG. -1.
In this configuration, an optical branching coupler 44-1 and 44-2 are provided in place of 34-2.

This optical branching coupler 44-1, 44-2 is an optical switch 2.
0-1゜20-2, the input and output light is distributed to the optical fiber 21, and the insertion loss of the optical signal is due to the optical switch 2.
Although it has the disadvantage that it is larger than the 0-1°20-2, it has the advantage that it does not require a switching control signal like the optical switch 20-1 or 20-21. Even when such optical branching couplers 44-1 and 44-2 are used, substantially the same functions and effects as in the above embodiment can be obtained.

Figure 5 shows the optical transmission devices 20-11 and 20-2 in Figure 4.
2 is a perspective view showing a mounting example of one optical transmission device 20-11, for example, in which each component is composed of an optoelectronic integrated circuit (OEIC), which is formed on a substrate 40, as in FIG. has been done.

(Effects of the Invention) As described above in detail, according to the present invention, the first switch circuit switches and inputs the input electrical signal, and the second switch circuit switches and outputs the output electrical signal. Therefore, one type of optical transmission equipment can be used to
Bidirectional transmission using optical fiber becomes possible. Furthermore, since the optical transmission equipment is compatible, it is expected that it will be easier to use and lower costs.

[Brief explanation of the drawing]

Figures 1 (1) and (2) are optical transmission system diagrams showing the configuration and usage example of a double-multiplexer type single-fiber bidirectional optical transmission device according to an embodiment of the present invention, and Figure 2 is a diagram of a conventional optical transmission system. Optical transmission system diagram showing the configuration and usage example of the transmission equipment, Figure 3 is similar to Figure 1.
FIG. 4 is a perspective view showing an example of mounting the optical transmission device in the figure.
1) and (2) are optical transmission system diagrams showing the configuration and usage example of a double-multiplexer-type single-fiber bidirectional optical transmission device showing other embodiments of the present invention, and FIG. 5 shows the optical system shown in FIG. FIG. 2 is a perspective view showing an example of implementation of a transmission device. 20-1.20-2.20-11, 20-22...
...Double multiplexer/demultiplexer single-core bidirectional optical transmission device, 21...
...1-core optical fiber, 30-11, 30-12,
30-21, 30-22... switch circuit,
31-11, 31-12, 31-21, 31-2
2...Electrical/optical converter, 32-11, 32-
12, 32-21, 32-22...Optical/electrical converter, 33-11, 33-12, 33-21
. 33-22... Optical multiplexer/demultiplexer, 34-1.34-
2... Hikari Sui Sochi, 44-1.44-2...
...Optical branching splicer, SiA, SiB -...
...Input electrical signal, SoA, SoB... Output electrical signal, λ1. λ2... Wavelength.

Claims (1)

[Claims] 1. First and second electrical/optical converters that convert input electrical signals into optical signals of first and second wavelengths, respectively;
a first converting each optical signal with a wavelength of
, a second optical/electrical converter, and a first optical/electrical converter that performs demultiplexing and multiplexing of optical signals of the and second wavelengths to the first electrical/optical converter and the first optical/electrical converter. an optical multiplexer/demultiplexer, and a second optical multiplexer/demultiplexer that performs demultiplexing and multiplexing of the optical signals of the first and second wavelengths to the second electrical/optical converter and the second optical/electrical converter. a distributing means for distributing input and output light of the first and second optical multiplexers and demultiplexers to a single-core optical fiber; and switching the input electrical signal to the first and second electrical/optical converters. and a second switch circuit that switches and outputs the output electrical signals of the first and second optical/electrical converters. Single-fiber bidirectional optical transmission device. 2. A double-polymer/demultiplexer type single-core bidirectional optical transmission device according to claim 1, wherein said distribution means is constituted by an optical switch. 3. The double-polymer/demultiplexer type single-core bidirectional optical transmission device according to claim 1, wherein the distribution means is constituted by an optical branching/coupling device. 4. The first and second electrical/optical converters, the first and second optical/electrical converters, the first and second optical multiplexer/demultiplexers, and the distribution means are housed in one module. A double-polymer/demultiplexer type single-fiber bidirectional optical transmission device according to claim 1. 5. The first and second electrical/optical converters, the first and second optical/electrical converters, the first and second optical multiplexer/demultiplexers, and the distribution means are constructed of optoelectronic integrated circuits. Claim 1
2. Double-multiplexer type single-fiber bidirectional optical transmission device as described in 2.