JP2002335242A - Optical signal transmission method, WDM network transmission device, and optical communication network system - Google Patents

Abstract

(57) [Summary] [PROBLEMS] In a WDM optical communication network system, an optical signal of a new wavelength for performing unauthorized communication unrelated to original communication is illegally intruded into an electrical network. To provide an optical signal transmission method, a WDM network transmission device, and an optical communication network system that prevent the above. SOLUTION: A router / servers 20 of a building 1 uses WDM optical communication by a photoelectric conversion unit 102 and a wavelength multiplexing / demultiplexing unit 101, for example, by using an optical signal of a wavelength λ2,
Information communication is performed with the router / servers 20 of the building 3 via the WDM network transmission device 6 and the wavelength multiplexing / demultiplexing unit 100 and the photoelectric conversion unit 102 of the building 3. On the other hand, an optical signal that has entered illegally from the wavelength multiplexing / demultiplexing unit 101 of the building 1 using the wavelength λ4 not used in this system is cut off by the hardware firewall 103 of the WDM network transmission device 6 of the building 2. Cannot enter the building 3 illegally.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an optical signal transmission method, a WDM network transmission apparatus, and an optical communication network system in WDM (Wavelength Division Multiplexer) optical communication using an optical fiber as a medium.

[0002]

2. Description of the Related Art A WDM optical communication network system using an optical fiber as a medium transmits a plurality of optical signals having different wavelengths through a single optical fiber. A transmitter is used to combine and transmit a plurality of optical signals having different wavelengths on the transmitting side, and separate and extract an optical signal having a desired wavelength on the receiving side. 5 and FIG.
In the DM optical communication network system, an example of an optical communication network system in which a plurality of conventional transmission devices are connected by an optical fiber cable is shown. FIG. 5 shows three transmission devices 10 and 11, which transmit optical signals having wavelengths λ1, λ2, and λ3 using an optical fiber as a medium.
FIG. 1 shows an optical communication network system in which transmission devices 12 are connected in series.
It is installed in building 1, building 2, and building 3, which are independent buildings, respectively, between the transmission device 10 and the transmission device 11 by the optical network 14, and between the transmission device 11 and the transmission device 12 by the optical network 15, Each is connected.

FIG. 6 shows an optical fiber as a medium.
For example, an optical communication network system in which three transmission devices 10, transmission devices 11, and transmission devices 12 that transmit optical signals having wavelengths λ1, λ2, and λ3 are connected in a ring shape is shown. Are installed in buildings 1, 2 and 3, which are independent buildings, respectively, and an optical network 16 is connected between the transmission device 10 and the transmission device 11.
Thus, the transmission device 10 and the transmission device 12 are connected by an optical network 17, and the transmission device 11 and the transmission device 12 are connected by an optical network 18. The optical network 14, the optical network 1
5. Each of the optical network 16, the optical network 17, and the optical network 18 is a transmission line including one optical fiber for transmitting an optical signal obtained by multiplexing a plurality of optical signals having different wavelengths.

FIG. 7 is a diagram showing an example of the wavelength of an optical signal transmitted in the above-described WDM optical communication network system. Optical signals transmitted by the optical communication network system and represented by, for example, wavelengths λ1, λ2, and λ3 are called C-band and L-band, and the wavelength is 1530
[Nm] to about 1610 [nm], and the wavelength of the optical signal in this range is 0.8 [n].
[m]].

Next, the details of the optical communication network system shown in FIGS. 5 and 6 will be described in more detail with reference to FIGS. 8 and 9. FIG. 8 is a diagram showing the details of the configuration of the optical communication network system corresponding to FIG. 5, and as shown in FIG. The optical communication network system including the transmission devices 10 to 12 is connected to the router / servers 20 forming the electric network of the building, and transmits the signal of the electric network in each building to the electric building of another building. It has the role of relaying to the system network. Further, a plurality of optical signals having different wavelengths input to the transmission device from an external optical network are demultiplexed for each wavelength,
In order to relay necessary signals to the electric network and output signals of the electric network to the optical network via the transmission device, the transmission devices 10 to 12 transmit the optical signals input to the transmission device, respectively. Wavelength multiplexing / demultiplexing unit A100 and wavelength multiplexing / demultiplexing unit B101 for multiplexing the optical signal output from the transmission device and the optical signal output from the transmission device. And a unit 102.

In such a configuration, the router / servers 20 of the building 1 communicate with the router / servers 20 of the building 2 using the optical signal of the wavelength λ1. Similarly, the router / servers 20 of the building 1 use the optical signal of the wavelength λ2 to
The communication with the router / servers 20 of the building 3 is performed via the transmission device 11 installed in the building 2. Similarly, the router / servers 20 of the building 2 communicate with the router / servers 20 of the building 3 using the optical signal of the wavelength λ3.

FIG. 9 is a diagram showing details of the configuration of the optical communication network system corresponding to FIG. FIG.
As shown in FIG. 8, in the configuration in which the same transmission devices 10 to 12 as in FIG. 8 are connected in a ring shape, the router / servers 20 of the building 1 directly use the optical signal of the wavelength λ1 to transmit 20. Further, the router / servers 20 of the building 1 uses the optical signal of the wavelength λ1 to
Can communicate with the router / servers 20 of the building 2 via the transmission device 11 installed in the building 2. Similarly, Building 1
The router / servers 20 communicate directly with the router / servers 20 of the building 3 using the optical signal of the wavelength λ2.
Further, the router / servers 20 of the building 1 can also communicate with the router / servers 20 of the building 3 via the transmission device 11 installed in the building 2 using the optical signal of the wavelength λ2. Similarly, the router / servers 20 of the building 2
The communication with the router / servers 20 of the building 3 is directly performed using the optical signal of the wavelength λ3. In addition, the router / servers 20 of the building 2 use the optical signal of the wavelength λ3 to transmit the router / servers 2 of the building 3 via the transmission device 11 installed in the building 1.
0 can also be communicated.

[0008]

However, in the above-described optical communication network system, as shown by a dotted line in FIG. 8, an illegal communication which is not related to the original communication is performed. New unused wavelength λ
4 enters the wavelength multiplexing / demultiplexing unit B101 of the building 1, for example.
1 to the transmission device 12 of the building 3, and the information accumulated in the router / servers 20 of the building 3 is illegally acquired. Similarly, in the optical communication network system shown in FIG. 9, an optical signal for performing illegal communication using the wavelength λ4 is entered into, for example, the wavelength multiplexing / demultiplexing unit A100 of the building 1, and from there, the transmission device of the building 2 is further transmitted. There is a problem that the information is accumulated in the router / servers 20 of the building 3 by being intruded into the transmission device 12 of the building 3 via the transmission line 11. Furthermore,
In the optical communication network system of FIG. 9, for example, an optical signal for performing unauthorized communication using the wavelength λ4 enters the wavelength multiplexing / demultiplexing unit A100 of the building 1 and the wavelength multiplexing / demultiplexing unit B101.
Then, there is a problem in that the information is further intruded into the transmission device 12 of the building 3 and the information stored in the router / servers 20 of the building 3 is illegally acquired.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and in a WDM optical communication network system, an optical signal of a new wavelength for performing unauthorized communication unrelated to the original communication is used for optical communication. An optical signal transmission method for preventing unauthorized intrusion into routers and servers constituting an electric network used in a network system and securing a security environment of the entire network, W
An object of the present invention is to provide a DM network transmission device and an optical communication network system.

[0010]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a WDM (wavelength division multiplexing) optical communication system which uses an optical fiber as a medium to multiplex and transmit a plurality of optical signals having different wavelengths. In order to relay signals inputted from one side of the optical network using the optical network to each other and output to the other side of the optical network, and to relay the optical network and the electrical network using the electrical signal, respectively, First and second optical multiplexing / demultiplexing means (for example, the wavelength multiplexing / demultiplexing unit A100 and the wavelength multiplexing / demultiplexing unit B101 in the embodiment) for multiplexing the demultiplexed optical signal and the output optical signal.
And converting the optical signal received from the first optical multiplexing / demultiplexing means or the second optical multiplexing / demultiplexing means into an electric signal and outputting it to an electric network, and converting the electric signal input from the electric network into an optical signal The first optical multiplexing / demultiplexing means or the second
An optical signal transmission method in a WDM network transmission apparatus including a photoelectric conversion unit (for example, the photoelectric conversion unit 102 of the embodiment) for outputting to the optical multiplexing / demultiplexing unit, wherein the first optical multiplexing / demultiplexing unit and the second optical Among the optical signals transmitted between the optical multiplexer / demultiplexer, the first optical multiplexer / demultiplexer, and the photoelectric converter, and between the second optical multiplexer / demultiplexer and the photoelectric converter. , An optical signal having a wavelength used for valid communication is selected, and other optical signals are excluded. With the configuration described above, an illegal optical signal using a wavelength unrelated to legitimate communication intruding from an arbitrary WDM network transmission device is cut off, and the optical signal is transmitted to the optical network via the optical multiplexing / demultiplexing means. Transmitted to another W
It is possible to prevent the security of the WDM network from being broken by invading a DM network transmission device or invading an electrical network using electrical signals that are converted into electrical signals and configured by routers and servers.

The present invention is characterized in that the wavelength of the selected optical signal is arbitrarily set in the selection of the optical signal in the optical signal transmission method. With the above configuration, it is possible to freely select an optical signal having a wavelength to be transmitted and an optical signal having a wavelength to be excluded.

The present invention relates to a WDM network transmission apparatus used in an optical network using WDM (wavelength division multiplexing) optical communication, which multiplexes and transmits a plurality of optical signals having different wavelengths using an optical fiber as a medium. Demultiplexing of optical signals input oppositely to relay signals inputted from one side of the optical network to each other and output to the other side of the optical network, and to relay the optical network and the electric network. First and second optical multiplexing / demultiplexing means for multiplexing an optical signal to be output, and an optical signal received from the first optical multiplexing / demultiplexing means or the second optical multiplexing / demultiplexing means, is converted into an electric signal. Photoelectric conversion means for converting the electric signal input from the electric network into an optical signal and outputting the converted signal to the first optical multiplexing / demultiplexing means or the second optical multiplexing / demultiplexing means. Means and the first optical demultiplexing means and the second
Among the optical signals transmitted between the optical multiplexer / demultiplexer, the first optical multiplexer / demultiplexer, and the photoelectric converter, and between the second optical multiplexer / demultiplexer and the photoelectric converter. From
Optical signal selecting means (for example, the hardware firewall 103 of the embodiment) for selecting an optical signal of a wavelength used for valid communication and excluding other optical signals is provided. With the above configuration, the WDM
It is possible to configure a network transmission device.

According to the present invention, in the WDM network transmission apparatus, the optical signal selecting means includes means for arbitrarily setting a wavelength of the optical signal to be selected. With the above configuration, it is possible to freely select an optical signal having a wavelength approved by the WDM network transmission device and an optical signal having a wavelength to be excluded according to the environment in which the WDM network transmission device is used.

The present invention relates to an optical communication network system using WDM (wavelength division multiplexing) optical communication, in which an optical fiber is used as a medium and a plurality of optical signals having different wavelengths are multiplexed and transmitted. Are arranged oppositely to relay the signals input from the optical network to each other and output to the other of the optical networks, and separate the input optical signals to relay the optical network and the electrical network using the electrical signals. First and second optical multiplexing / demultiplexing means for multiplexing a wave and an optical signal to be output; first optical multiplexing / demultiplexing means;
Alternatively, the optical signal received from the second optical multiplexer / demultiplexer is converted into an electrical signal and output to an electrical network, and the electrical signal input from the electrical network is converted into an optical signal and converted into an optical signal. Or between the first optical multiplexer / demultiplexer and the photoelectric converter, and between the first optical multiplexer / demultiplexer and the second optical multiplexer / demultiplexer, and between the first optical multiplexer / demultiplexer and the photoelectric converter. , And between each of the second optical multiplexing / demultiplexing means and the photoelectric conversion means, select an optical signal having a wavelength used for proper communication from the transmitted optical signals, and And a plurality of WDM network transmission devices having an optical signal selection unit for eliminating the above.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a WDM network transmission device according to an embodiment of the present invention will be described with reference to the drawings. In addition, in order to simplify the description, the W
In a WDM optical communication network system using a DM network device, the wavelength of an optical signal transmitted for original communication in the optical communication network system is λ1,
There are three wavelengths λ2 and λ3, and the wavelength of a new optical signal for performing unauthorized communication unrelated to the original communication is λ4. FIG. 1 shows a WDM according to an embodiment of the present invention.
FIG. 1 is a diagram illustrating a first embodiment of a WDM optical communication network system using a network transmission device. In FIG. 1, a building 1, a building 2, and a building 3 are W
It is an independent building in which the DM network transmission devices 5 to 7 are respectively installed. The WDM network transmission device 5 and the WDM network transmission device 6 are connected by an optical network 14, and the WDM network transmission device 6 and the WDM network transmission device 7 are connected by an optical network 15. Each of the WDM network transmission devices 5 to 7 is connected to a router / server 20 constituting an electric network in each building by an electric signal, and the WDM network transmission devices 5 to 7 include the WDM network transmission devices 5 to 7. The communication network system has a role of relaying an electric network signal in each building to an electric network in another building.

Also, a plurality of optical signals having different wavelengths input to the WDM network transmission device from an external optical network are demultiplexed for each wavelength, and necessary signals are relayed to an electrical network. In order to output the signal of the network of FIG. 1 to the optical network via the transmission device, the WDM network transmission devices 5 to 7 combine the demultiplexing of the optical signal input to the transmission device and the optical signal output from the transmission device. It comprises a wavelength multiplexing / demultiplexing unit A100 for performing a wave, a wavelength multiplexing / demultiplexing unit B101, and a photoelectric conversion unit 102 for converting an optical signal into an electric signal or converting an electric signal into an optical signal. Here, the wavelength multiplexing / demultiplexing unit A100 and the wavelength multiplexing / demultiplexing unit B101 are, for example, a dielectric multilayer type using a dielectric multilayer filter for selecting a wavelength or a waveguide type using the wavelength dispersion of an arrayed waveguide. Etc. Also, the photoelectric conversion unit 1
Reference numeral 02 denotes a semiconductor laser, a light emitting diode, or the like used for conversion from an electric signal to an optical signal, and an avalanche photodiode or a PIN for conversion from an optical signal to an electric signal.
A diode or the like is used.

Further, WDM network transmission devices 5 to 7
Is provided with a hardware firewall 103 having a wavelength discriminating function of blocking an optical signal for performing illegal communication by setting a used wavelength. The hardware firewall 103 includes a wavelength multiplexing / demultiplexing unit A100 and a wavelength multiplexing / demultiplexing unit B1.
01, the wavelength multiplexing / demultiplexing unit A100 and the photoelectric conversion unit 10
2, the wavelength multiplexing / demultiplexing unit B101 and the photoelectric conversion unit 1
In each of the intervals between 02 and 02, an optical signal having a wavelength used for legitimate communication is selected from among the transmitted optical signals, and other optical signals are excluded. Here, the wavelength of the optical signal used for the legitimate communication is set in advance, and the wavelength used for the legitimate communication and the transmission is allowed, and the wavelength cut off as the wavelength for performing the illegal communication. Can be changed.

For example, as shown in FIG. 2, the hardware firewall 103 determines the course of an optical signal using a mechanical or photoelectric type optical switch 200, and switches the optical switch to a CPU (Central Processing Unit). ), Etc., it is possible to freely control the optical signal as described above.
The setting of the hardware firewall 103 shown in FIG. 2 is a setting when used in the WDM network transmission device 6 of FIG. 1, and the optical signal of the wavelength λ1 is connected to the wavelength multiplexing / demultiplexing unit A with the wavelength multiplexing / demultiplexing unit A. The optical signal of the wavelength λ2 is transmitted between the wavelength multiplexing / demultiplexing unit A and the photoelectric conversion unit, and the optical signal of the wavelength λ3 is transmitted between the wavelength multiplexing / demultiplexing unit B and the photoelectric conversion unit. The optical signal of the wavelength λ4 transmitted between the optical network unit and the optical network unit is not connected to anywhere and is not output from the hardware firewall 103.

In such a configuration, the router / servers 20 of the building 1 communicate with the router / servers 20 of the building 2 using the optical signal of the wavelength λ1. Similarly, the router / servers 20 of the building 1 use the optical signal of the wavelength λ2 to
It communicates with the router / servers 20 in the building 3 via the WDM network transmission device 6 installed in the building 2. Similarly, the router / servers 20 of the building 2 communicate with the router / servers 20 of the building 3 using the optical signal of the wavelength λ3. However, as shown by the dotted line in FIG. 1, for example, the wavelength multiplexing / demultiplexing unit B101 of the building 1 is caused by an optical signal that performs unauthorized communication using the wavelength λ4 that is not used in this system.
, The illegal optical signal using the wavelength λ4 is cut off at the WDM network transmission device 6 of the building 2 and the WDM network transmission device 7 of the building 3 is not illegally entered.

FIG. 3 shows a first example of the WDM optical communication network system according to the present embodiment.
It is a figure which shows a mode that the optical signal of the unauthorized intrusion into the building 3 is interrupted. Like FIG. 1, as shown by the dotted line in FIG. 3, even if an illegal optical signal using the wavelength λ4 which is not used in this system enters the wavelength multiplexing / demultiplexing unit B101 of the building 2, for example, In the WDM network transmission device 7 of the building 3, an unauthorized optical signal using the wavelength λ4 is cut off, so that the router / servers 20 of the building 3 are not illegally invaded.

Further, in the above description of the first embodiment, an example of an optical signal that illegally enters the building 3 from the building 1 or the building 2 has been described. Unauthorized intrusion into the routers / servers 20 of the building 1 from the wavelength multiplexing / demultiplexing part of the building 1, unauthorized entry into the routers / servers 20 of the building 2 from the wavelength multiplexing / demultiplexing part of the building 1, and furthermore, From the branching unit to the routers and servers 20 of building 3
Or unauthorized intrusion into the routers / servers 20 of the building 1 from the wavelength multiplexing / demultiplexing part of the building 2 or into the router / servers 20 of the building 2 from the wavelength multiplexing / demultiplexing part of the building 2 Further, unauthorized intrusion into the router / servers 20 of the building 3 from the wavelength multiplexing / demultiplexing unit of the building 2 or unauthorized entry into the router / servers 20 of the building 1 from the wavelength multiplexing / demultiplexing unit of the building 3 Regarding the unauthorized intrusion into the router / servers 20 of the building 2 from the wavelength multiplexing / demultiplexing unit and the unauthorized intrusion into the router / servers 20 of the building 3 from the wavelength multiplexing / demultiplexing unit of the building 3,
The optical signal of the wavelength used for the unauthorized intrusion can be blocked.

Second Embodiment Next, a second embodiment of the WDM optical communication network system using the WDM network transmission apparatus according to the embodiment of the present invention will be described with reference to FIG. FIG. 4 shows a configuration in which the WDM network transmission devices 5 to 7 described in FIG. 1 are connected in a ring shape, and the router / servers 20 of the building 1 use the optical signal of the wavelength λ1 to directly Communicates with the router / servers 20 of the server. Further, the router / servers 20 of the building 1 can also communicate with the router / servers 20 of the building 2 via the WDM network transmission device 7 installed in the building 3 using the optical signal of the wavelength λ1. . Similarly, the router / servers 20 of the building 1 directly communicate with the router / servers 20 of the building 3 using the optical signal of the wavelength λ2. Further, the router / servers 20 of the building 1 can also communicate with the router / servers 20 of the building 3 via the WDM network transmission device 6 installed in the building 2 using the optical signal of the wavelength λ2. .

Similarly, the router / servers 20 of the building 2
Is the router of building 3 directly using the optical signal of wavelength λ3.
It communicates with the servers 20. Further, the router / servers 20 of the building 2 use the optical signal of the wavelength λ3 to transmit the building 3 via the WDM network transmission device 5 installed in the building 1.
Can also communicate with the router / servers 20 of the above. However, as shown by a dotted line in FIG. 4, an illegal optical signal using a wavelength λ4 not used in this system causes
For example, even if it enters the wavelength multiplexing / demultiplexing part A100 of the building 1,
In the WDM network transmission device 6 in the building 2, an illegal optical signal using the wavelength λ4 is cut off, and the WDM
There is no unauthorized intrusion into the network transmission device 7.
Further, even if an illegal optical signal using the wavelength λ4 enters the wavelength multiplexing / demultiplexing unit A100 of the building 1, for example, and enters the WDM network transmission device 7 of the building 3 from the wavelength multiplexing / demultiplexing unit B101, In the WDM network transmission device 7 of the building 3, an unauthorized optical signal using the wavelength λ4 is cut off, and no unauthorized intrusion into the router / servers 20 occurs.

Further, in the above description of the second embodiment, an example of an optical signal that illegally enters the building 3 from the building 1 has been described. However, the WDM network transmission apparatus of the present embodiment uses the wavelength Router / servers 20 of building 1 from branching section
Unauthorized intrusion into the router / servers 20 of the building 2 from the wavelength multiplexing / demultiplexing unit of the building 1, and unauthorized entry into the router / servers 20 of the building 3 from the wavelength multiplexing / demultiplexing unit of the building 1,
Alternatively, unauthorized intrusion into the router / servers 20 of the building 1 from the wavelength multiplexing / demultiplexing part of the building 2, unauthorized intrusion into the router / servers 20 of the building 2 from the wavelength multiplexing / demultiplexing part of the building 2, and furthermore, wavelength of the building 2 Unauthorized intrusion into the router / servers 20 of the building 3 from the multiplexer / demultiplexer, or unauthorized intrusion into the router / servers 20 of the building 1 from the wavelength multiplexer / demultiplexer of the building 3 or from the wavelength multiplexer / demultiplexer of the building 3 Unauthorized intrusion into the router / servers 20 of the building 2 and the router / servers 2 of the building 3 from the wavelength multiplexing / demultiplexing unit of the building 3
With respect to each of the unauthorized intrusions into 0, any path of the optical signal of the wavelength used for the unauthorized intrusion can be blocked.

The optical network 14, the optical network 15, and the optical network 1 in the above-described embodiment are described.
6, the optical network 17 and the optical network 18 are transmission lines each composed of one optical fiber for transmitting an optical signal obtained by multiplexing a plurality of optical signals having different wavelengths, similarly to the conventional example. Further, in the first and second examples of the above-described embodiment, the case where the number of building connections is three has been described. However, even when the number of building connections is two or four or more, the present embodiment is also applicable. The WDM network transmission device according to the above aspect can block an unauthorized optical signal using a wavelength not used in the system, and prevent the optical signal from entering the optical communication network system illegally.

[0026]

As described above, according to the present invention, in a WDM optical communication network system, a wavelength different from the wavelength of an optical signal used for the original communication for the purpose of illegally acquiring information existing on the network. If an optical signal intrudes into the optical communication network system, an optical signal of a wavelength for performing unauthorized communication is transmitted on the network,
It is possible to prevent an intrusion into an electric network connected to the optical communication network system, thereby improving network security.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a first example of a WDM optical communication network system using a WDM network transmission device according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating a configuration example of a hardware firewall according to the embodiment;

FIG. 3 is a diagram showing a manner in which an optical signal of unauthorized intrusion is cut off in the first example of the WDM optical communication network system of the embodiment.

FIG. 4 is a diagram showing a second example of the WDM optical communication network system using the WDM network transmission device of the embodiment.

FIG. 5 is a diagram illustrating a connection example of a conventional transmission device.

FIG. 6 is a diagram illustrating a ring-shaped connection example of a conventional transmission device.

FIG. 7 is a diagram illustrating wavelengths of optical signals transmitted in the WDM optical communication network system.

FIG. 8 is a diagram illustrating an intrusion route of an unauthorized communication in a connection example of a conventional transmission device.

FIG. 9 is a diagram illustrating an intrusion route of unauthorized communication in a ring-shaped connection example of a conventional transmission device.

[Explanation of symbols]

 1-3 building 5-7 WDM network transmission device 20 router / servers 100 wavelength multiplexing / demultiplexing unit A 101 wavelength multiplexing / demultiplexing unit B 102 photoelectric conversion unit 103 hardware firewall 200 optical switch

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Yasuhiro Maehara 2-3-1 Otemachi, Chiyoda-ku, Tokyo F-term in Nippon Telegraph and Telephone Corporation (reference) 5J104 AA05 BA04 5K002 DA02 DA09 FA01

Claims (5)

[Claims] 1. An optical fiber medium serving as a medium, a plurality of optical signals having different wavelengths are multiplexed and transmitted, and signals inputted from one side of an optical network using WDM (wavelength division multiplexing) optical communication are relayed to each other. In order to output the optical signal to the other side of the optical network, and to relay the optical network and the electrical network using the electrical signal, the demultiplexing of the input optical signal and the combining of the output optical signal are performed. First and second optical multiplexing / demultiplexing means for performing a wave; converting an optical signal received from the first optical multiplexing / demultiplexing means or the second optical multiplexing / demultiplexing means into an electric signal; And a photoelectric conversion unit that converts an electric signal input from the electric network into an optical signal and outputs the converted signal to the first optical multiplexing / demultiplexing unit or the second optical multiplexing / demultiplexing unit. An optical signal transmission method in a network transmission device, wherein: between the first optical multiplexing / demultiplexing means and the second optical multiplexing / demultiplexing means, between the first optical multiplexing / demultiplexing means and the photoelectric conversion means, And between each of the second optical multiplexing / demultiplexing means and the photoelectric conversion means,
An optical signal transmission method comprising selecting an optical signal having a wavelength used for legitimate communication and excluding other optical signals. 2. The optical signal transmission method according to claim 1, wherein in selecting the optical signal, a wavelength of the optical signal to be selected is arbitrarily set. 3. A WDM used in an optical network using WDM (wavelength division multiplexing) communication, in which a plurality of optical signals having different wavelengths are multiplexed and transmitted using an optical fiber as a medium.
In a network transmission device, signals input from one of the optical networks are arranged to face each other to relay each other and output to the other of the optical networks, and to relay the optical network and the electrical network, First and second for demultiplexing the input optical signal and multiplexing the output optical signal, respectively.
An optical multiplexing / demultiplexing means, and converting the optical signal received from the first optical multiplexing / demultiplexing means or the second optical multiplexing / demultiplexing means into an electric signal, outputting the electric signal to the electric network, and inputting the electric signal from the electric network. A photoelectric conversion unit that converts the obtained electric signal into an optical signal and outputs the electric signal to the first optical multiplexing / demultiplexing unit or the second optical multiplexing / demultiplexing unit; the first optical multiplexing / demultiplexing unit; Between the first optical multiplexing / demultiplexing means and the photoelectric conversion means, and between the second optical multiplexing / demultiplexing means and the photoelectric conversion means. From the optical signal,
A WDM network transmission device, comprising: an optical signal selection unit that selects an optical signal having a wavelength used for valid communication and excludes other optical signals. 4. The WDM network transmission apparatus according to claim 3, wherein said optical signal selecting means includes means for arbitrarily setting a wavelength of said optical signal to be selected. 5. A signal input from one side of an optical network using WDM (wavelength division multiplexing) optical communication, in which a plurality of optical signals having different wavelengths are multiplexed and transmitted using an optical fiber as a medium, and relayed to each other. In order to output the optical signal to the other side of the optical network, and to relay the optical network and the electrical network using the electrical signal, the demultiplexing of the input optical signal and the combining of the output optical signal are performed. First and second optical multiplexing / demultiplexing means for performing a wave; converting an optical signal received from the first optical multiplexing / demultiplexing means or the second optical multiplexing / demultiplexing means into an electric signal; Photoelectric conversion means for converting the electric signal input from the electric network into an optical signal and outputting the converted signal to the first optical multiplexing / demultiplexing means or the second optical multiplexing / demultiplexing means; Light of Between the demultiplexing means and the second optical multiplexing / demultiplexing means, between the first optical multiplexing / demultiplexing means and the photoelectric conversion means, and between the second optical multiplexing / demultiplexing means and the photoelectric conversion means In each of the transmitted optical signals,
An optical signal selecting means for selecting an optical signal of a wavelength used for legitimate communication and excluding other optical signals, and a plurality of WDM network transmission devices comprising: Optical communication network system.