KR20200084610A - Optical network for preventing frame collision and communication method in the same - Google Patents

Abstract

Disclosed are an optical network for preventing frame collision and an optical communication method in the same. The optical network includes a plurality of optical nodes and a wavelength conversion node. Here, at least one of the plurality of optical nodes uses a different wavelength. When an optical signal is received from a specific optical node among the plurality of optical nodes, the wavelength conversion node converts a wavelength of the received optical signal into a wavelength of a destination node and forwards the optical signal having the converted wavelength to a destination node.

Description

Optical network for preventing frame collision and optical communication method therefor{OPTICAL NETWORK FOR PREVENTING FRAME COLLISION AND COMMUNICATION METHOD IN THE SAME}

The present invention relates to an optical network for preventing frame collision and a communication method therefor.

High-avaliablity sealess redundancy (HSR) technology that can be implemented in a general network existed, but there was no optical HSR (optical HSR) technology that was practically implemented in an optical network, and only a concept was presented. It is important to prevent frame collision even in such an optical network, but such a developed technology does not exist to date.

KR 10-2018-0135045 A

The present invention provides an optical network capable of preventing frame collision and a communication method therefor.

In order to achieve the above object, an optical network according to an embodiment of the present invention includes a plurality of optical nodes; And a wavelength conversion node. Here, at least one of the optical nodes uses a different wavelength, and the wavelength conversion node converts the wavelength of the received optical signal to the wavelength of the destination node when an optical signal is received from a specific optical node among the optical nodes. The optical signal having the converted wavelength is forwarded to the destination node.

An optical network according to another embodiment of the present invention includes a plurality of optical nodes; And a wavelength conversion node. Here, when the wavelength conversion node receives an optical signal from a specific optical node among the optical nodes, the wavelength of the received optical signal is converted to wavelengths of other optical nodes except the specific optical node, and the converted wavelengths are Branches forward optical signals.

An optical network according to another embodiment of the present invention includes a plurality of optical nodes; And a wavelength conversion node, wherein the wavelength conversion node converts a wavelength of the received optical signal into a basic wavelength when an optical signal is received from a specific optical node among the optical nodes, and an optical signal having the converted basic wavelength. Forwarding. Here, the fundamental wavelength is different from the wavelengths of the optical nodes.

A wavelength conversion node according to an embodiment of the present invention includes a communication unit that receives an optical signal from an optical node; And a wavelength converter configured to convert the wavelength of the received optical signal to one of a wavelength of a destination node, a wavelength of an optical node different from the optical node, or a fundamental wavelength. Here, the wavelength conversion unit forwards the optical signal having the converted wavelength through the communication unit, and the converted wavelength is different from the wavelength of the received optical signal.

An optical node according to an embodiment of the present invention includes a communication unit for forwarding a first optical signal; And a signal processor which receives and processes the second optical signal transmitted from the wavelength conversion node. Here, the wavelength of the first optical signal is different from the wavelength of the second optical signal.

A communication method in an optical network according to an embodiment of the present invention includes: a wavelength conversion node receiving an optical signal having a first wavelength transmitted from a source node; Converting a wavelength of the received optical signal to a second wavelength of a destination node by the wavelength conversion node; And the wavelength conversion node forwarding the optical signal having the second wavelength to a destination node. Here, the source node and the destination node use different wavelengths as optical nodes, and the first wavelength and the second wavelength are different wavelengths.

A communication method in an optical network according to another embodiment of the present invention includes: a wavelength conversion node receiving an optical signal transmitted from a source node; Converting the wavelength of the received optical signal to wavelengths of other optical nodes except the source node by the wavelength conversion node; And the wavelength conversion node broadcasting the optical signals having the converted wavelengths and the optical signal transmitted from the source node. Here, at least one of the optical nodes uses a different wavelength.

In another embodiment of the present invention, a communication method in an optical network includes: a wavelength conversion node receiving an optical signal transmitted from an optical node; Converting the wavelength of the received optical signal to a basic wavelength by the wavelength conversion node; And the wavelength conversion node forwarding the optical signal having the basic wavelength. Here, the optical node may receive and process the optical signal having the basic wavelength, but cannot generate and forward the optical signal having the basic wavelength.

Since the optical network according to the present invention uses a wavelength division multiplexing technique, since each optical node uses a different wavelength and the wavelength conversion node controls the optical signal transmitted to the optical node in the middle, collision of frames can be prevented.

1 is a diagram showing an optical network according to a first embodiment of the present invention.
2 is a diagram illustrating an optical network to which a collision avoidance technique is not applied.
3 is a diagram showing an optical network according to a second embodiment of the present invention.
4 is a diagram showing an optical network according to a third embodiment of the present invention.

As used herein, a singular expression includes a plural expression unless the context clearly indicates otherwise. In this specification, the terms "consisting of" or "comprising" should not be construed as including all of the various components, or various steps described in the specification, among which some components or some steps It may not be included, or it should be construed to further include additional components or steps. In addition, terms such as “... unit” and “module” described in the specification mean a unit that processes at least one function or operation, which may be implemented in hardware or software, or a combination of hardware and software. .

The present invention relates to an optical network and a communication method therefor, and can prevent frame collision.

According to one embodiment, the optical network may prevent frame collision by setting each optical node to have a different wavelength using a wavelength division multiplexing technique. This frame collision avoidance technique is applicable to both unicast and broadcast communication schemes.

Hereinafter, various embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a diagram illustrating an optical network according to a first embodiment of the present invention, and FIG. 2 is a diagram illustrating an optical network to which a collision avoidance technique is not applied. Meanwhile, for convenience of description, it is assumed that the optical network uses unicast communication and includes 7 optical nodes. However, the number of optical nodes is sufficient, and is not limited to seven optical nodes.

Referring to Figure 1, the optical network of the present embodiment is a plurality of optical nodes (A to G), a wavelength conversion node (narrator node, 100) and couplers (110, 112, 114, 116, 118, 120, 122 and 124).

The optical nodes A to G may each perform optical communication, and may be connected by one channel. Accordingly, the optical nodes A to G can transmit and receive optical signals including frames through the channel.

According to an embodiment, the optical nodes A to G may use different wavelengths, that is, they may transmit or receive optical signals of different wavelengths. For example, the first optical node A can transmit and receive an optical signal having a first wavelength λ1, and the second optical node B can transmit and receive an optical signal having a second wavelength λ2. In addition, the third optical node C may transmit and receive an optical signal having a third wavelength λ3. The fourth optical node D can transmit and receive optical signals having a fourth wavelength λ4, and the fifth optical node E can transmit and receive optical signals having a fifth wavelength λ5, and the sixth The optical node F can transmit and receive optical signals having the sixth wavelength λ6, and the seventh optical node G can transmit and receive optical signals having the seventh wavelength λ7.

According to an embodiment, couplers 110, 112, 114, 118, 120, 122 or 124 may be connected to the optical nodes A to G, respectively. The coupler (110, 112, 114, 118, 120, 122 or 124) transmits the optical signal transmitted from the optical node connected to it to the next coupler, and some of the received optical signals are transmitted to the optical node connected to it Other optical signals can be sent to the next coupler. Here, some optical signals may mean optical signals having a wavelength of an optical node connected to them.

When the optical signal is received, the wavelength conversion node 100 analyzes the optical signal to identify the destination node of the optical signal, converts the wavelength of the optical signal to the identified wavelength of the destination node, and has the converted wavelength An optical signal can be transmitted to the destination node. That is, for example, when the wavelength of the received optical signal is λ6 and the wavelength of the destination node is λ1, the wavelength conversion node 100 converts the wavelength of the optical signal from λ6 to λ1, and has a wavelength of λ1 The signal may be forwarded to the destination node F.

According to an embodiment, the wavelength conversion node 100 may control not only wavelength conversion but also optical signals not colliding at the destination node. That is, the wavelength conversion node 100 may control that the same optical signals to the destination node are not received at the same time or at a similar time. This function is possible because all optical signals are controlled by the wavelength conversion node 100.

In addition, the wavelength conversion node 100 may have a termination function. That is, the wavelength conversion node 100 may perform a function of terminating the transmission of the optical signal to prevent the optical signal from infinitely circulating through the optical network.

The coupler 116 is connected to the wavelength conversion node 100, transmits all received optical signals to the wavelength conversion node 100, and forwards the optical signals transmitted from the wavelength conversion node 100 in a predetermined direction. . Of course, the forwarded optical signal is received by the destination node.

In summary, the optical network of the present invention can prevent frame collision through a method in which each optical node uses a different wavelength and the wavelength conversion node 100 controls optical signals.

Hereinafter, the operation of the optical network of the present invention using the wavelength division multiplexing technique and the optical network not using the wavelength division multiplexing technique will be compared.

2 shows an optical network in which all optical nodes use the same wavelength without using the wavelength division multiplexing function. Couplers 210, 212, 214, 218, 220, 222, 224, or 216 may be connected to the optical nodes A to G and the terminal node 200, respectively.

In this optical network, when the optical node A and the optical node B transmit the same signal (frame) to the same destination node D, the frames transmitted from the optical nodes A and B are simultaneously or at a similar time. When received by the destination node D, the frames may collide and communication may fail. This occurs because the signal processing time of the destination node D is relatively longer than the optical transmission time.

To solve this problem, the optical network of the present invention uses different wavelengths for each optical node (A to G). Of course, it is an optimal technique to prevent frame collision when all of the optical nodes A to G use different wavelengths, but some of the optical nodes A to G may use the same wavelength.

According to an embodiment, the optical nodes A to G use different wavelengths, but after the wavelength conversion node 100 converts the wavelength of the optical signal transmitted from the source node to the wavelength of the destination node, the converted wavelength It is possible to transmit an optical signal having a to the destination node. That is, the wavelength conversion node 100 may perform a relay and control role of an optical signal.

For example, as the source node, the optical node A forwards the first optical signal having the wavelength of λ1 to the destination node D in a unicast manner, and the second optical beam as the source node B has the wavelength of λ2. When the signal is forwarded to the destination node D in a unicast manner, the optical signals are not directly received by the destination node D, but are received by the wavelength conversion node 100, and the wavelength conversion node 100 receives the received light. The wavelength of the signals is converted to the wavelength λ4 of the destination node D. Subsequently, the wavelength conversion node 100 forwards the optical signals having the wavelength λ4 to the destination node D.

At this time, the wavelength conversion node 100 may control the optical signals to not collide at the destination node D in consideration of the signal processing time of the destination node D. For example, after the wavelength conversion node 100 predicts the time when the optical signals arrive at the destination node D, the forwarding time may be controlled so that collision does not occur.

Meanwhile, since the optical network uses a unicast method, the wavelength conversion node 100 forwards the first optical signal transmitted from the optical node A in the direction of the optical node C after wavelength conversion, and then the optical node B After the wavelength conversion of the second optical signal transmitted from can be forwarded in the direction of the optical node (D).

3 is a diagram showing an optical network according to a second embodiment of the present invention. Here, the optical network uses a broadcasting communication method.

Referring to FIG. 3, the optical network of this embodiment includes a plurality of optical nodes (A to G), a wavelength conversion node (narrator node, 300) and couplers 310, 312, 314, 316, 318, 320, 322, and 324).

The optical nodes A to G may use different wavelengths.

The wavelength conversion node 300 may convert a wavelength of an optical signal transmitted from a specific optical node to wavelengths other than the wavelength of the specific optical node. Subsequently, the wavelength conversion node 300 may broadcast the optical signals having the converted wavelength and the received optical signals. That is, the wavelength conversion node 300 may broadcast optical signals having wavelengths of all optical nodes when the optical signal is received.

For example, when an optical signal having a wavelength of λ1 transmitted from the optical node A is received by the wavelength conversion node 300, the wavelength conversion node 300 broadcasts optical signals having wavelengths of λ1 to λ7, respectively. Can.

4 is a diagram showing an optical network according to a third embodiment of the present invention. 3, the optical network uses a broadcasting communication method.

4, the optical network of this embodiment includes a plurality of optical nodes (A to G), a wavelength conversion node (narrator node 400), and couplers 410, 412, 414, 416, 418, 420, 422, and 424).

The optical nodes A to G may use different wavelengths.

The wavelength conversion node 400 may convert the wavelength of the received optical signal to the basic wavelength (λ0) regardless of which optical node is received, and broadcast the optical signal having the wavelength of λ0. Here, the basic wavelength λ0 may be a wavelength that is not used to transmit an optical signal at each of the optical nodes A to G.

That is, the optical nodes A to G can receive and process an optical signal having a wavelength of λ0, but cannot generate and forward an optical signal having a wavelength of λ0.

This optical communication method can reduce the traffic while increasing the cost compared to the optical communication method of the second embodiment.

Although not described above, the wavelength conversion node converts the communication unit that receives the optical signal from the optical node and the wavelength of the received optical signal to one of a wavelength of a destination node, a wavelength of the optical node different from that of the optical node, or a fundamental wavelength. It may contain wealth.

Here, the wavelength conversion unit forwards the optical signal having the converted wavelength through the communication unit.

Further, the optical node and the destination node use different wavelengths, and the basic wavelength is different from the wavelengths of the optical node and the destination node, but the optical node receives or processes an optical signal having the basic wavelength. It may, but may not be able to forward.

The optical node may include a communication unit transmitting and receiving an optical signal, an optical signal generating unit generating an optical signal, and a signal processing unit processing the received optical signal.

On the other hand, the components of the above-described embodiments can be easily grasped from a process point of view. That is, each component can be identified by each process. Also, the process of the above-described embodiment can be easily grasped from the perspective of the components of the device.

In addition, the technical contents described above may be implemented in a form of program instructions that can be executed through various computer means and may be recorded on a computer-readable medium. The computer-readable medium may include program instructions, data files, data structures, or the like alone or in combination. The program instructions recorded on the medium may be specially designed and configured for the embodiments or may be known and usable by those skilled in computer software. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tapes, optical media such as CD-ROMs, DVDs, and magnetic media such as floptical disks. -Hardware devices specifically configured to store and execute program instructions such as magneto-optical media, and ROM, RAM, flash memory, and the like. Examples of program instructions include high-level language code that can be executed by a computer using an interpreter, etc., as well as machine language codes made by a compiler. The hardware device can be configured to operate as one or more software modules to perform the operations of the embodiments, and vice versa.

The above-described embodiments of the present invention have been disclosed for purposes of illustration, and those skilled in the art having various knowledge of the present invention will be able to make various modifications, changes, and additions within the spirit and scope of the present invention. It should be regarded as belonging to the following claims.

100, 200, 300, 400: wavelength conversion node (narrator node)

Claims (14)

A plurality of optical nodes; And
Including a wavelength conversion node,
At least one of the optical nodes uses a different wavelength, and the wavelength conversion node converts the wavelength of the received optical signal to a wavelength of a destination node when an optical signal is received from a specific optical node among the optical nodes. And forwarding an optical signal having a predetermined wavelength to the destination node. The method of claim 1, wherein the optical nodes use different wavelengths and are connected through an optical channel, the optical signal is transmitted and received through a unicast method, and the wavelength conversion node has an optical signal having the converted wavelength. An optical network, characterized in that the destination node forwards the optical signal by controlling not to collide with other optical signals. According to claim 1,
Further comprising a coupler respectively connected to the optical node and the wavelength conversion node,
The optical signal transmitted from the specific optical node is received by the wavelength conversion node through a coupler connected to the wavelength conversion node, and the optical signal having the converted wavelength is transmitted to the destination node through the coupler. Optical network. A plurality of optical nodes; And
Including a wavelength conversion node,
The wavelength conversion node converts a wavelength of the received optical signal to wavelengths of other optical nodes except the specific optical node when an optical signal is received from a specific optical node among the optical nodes, and has light having the converted wavelengths. Optical network characterized by forwarding signals. 5. The optical network according to claim 4, wherein the optical nodes are interconnected through an optical channel, and the wavelength conversion node broadcasts the received optical signal as well as optical signals having the converted wavelengths. A plurality of optical nodes; And
It includes a wavelength conversion node,
The wavelength conversion node converts a wavelength of the received optical signal to a basic wavelength when an optical signal is received from a specific optical node among the optical nodes, and forwards an optical signal having the converted basic wavelength,
Wherein the fundamental wavelength is different from the wavelengths of the optical nodes. 7. The optical node of claim 6, wherein the optical nodes are interconnected through an optical channel, and the wavelength conversion node converts the wavelength of the received optical signal to the basic wavelength regardless of which optical nodes the optical signal is received from. And broadcasting an optical signal having the converted fundamental wavelength. The optical network of claim 6, wherein the optical nodes can receive and process the optical signal having the basic wavelength, but cannot generate and forward the optical signal having the basic wavelength. A communication unit that receives an optical signal from an optical node; And
A wavelength conversion unit for converting the wavelength of the received optical signal to one of the wavelength of the destination node, the wavelength of the optical node different from the optical node or a basic wavelength,
The wavelength conversion unit forwards the optical signal having the converted wavelength through the communication unit, and the converted wavelength is different from the wavelength of the received optical signal. The method of claim 9, wherein the optical node and the destination node use different wavelengths, the basic wavelength is different from the wavelength of the optical node and the destination node,
The optical node is a wavelength conversion node characterized in that it can receive or process the optical signal having the basic wavelength, but cannot generate and forward it. In the optical node,
A communication unit for forwarding the first optical signal; And
A signal processing unit for receiving and processing the second optical signal transmitted from the wavelength conversion node,
The wavelength of the first optical signal is different from the wavelength of the second optical signal. A wavelength conversion node receiving an optical signal having a first wavelength transmitted from a source node;
Converting a wavelength of the received optical signal to a second wavelength of a destination node by the wavelength conversion node; And
The wavelength conversion node comprises the step of forwarding the optical signal having the second wavelength to a destination node,
The source node and the destination node use different wavelengths as optical nodes, and the first wavelength and the second wavelength are different wavelengths. A wavelength conversion node receiving an optical signal transmitted from a source node;
Converting the wavelength of the received optical signal to wavelengths of other optical nodes except the source node by the wavelength conversion node; And
The wavelength conversion node includes the step of broadcasting the optical signal having the converted wavelengths and the optical signal transmitted from the source node,
A communication method in an optical network, characterized in that at least one of the optical nodes uses a different wavelength. A wavelength conversion node receiving an optical signal transmitted from the optical node;
Converting the wavelength of the received optical signal to a basic wavelength by the wavelength conversion node; And
The wavelength conversion node includes the step of forwarding the optical signal having the basic wavelength,
The optical node may receive and process the optical signal having the basic wavelength, but cannot generate and forward the optical signal having the basic wavelength.

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