KR102303611B1 - Optical network for preventing frame collision and communication method in the same - Google Patents

Abstract

An optical network capable of preventing frame collision and a communication method therein are disclosed. The optical network 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 a wavelength of a 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.

Description

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 therein.

Although HSR (High-availability seamless redundancy) technology that can be implemented in a general network exists, there is no optical HSR (Optical HSR) technology that can be implemented in an optical network, and only a concept is presented. It is important to prevent frame collision even in such an optical network, but such a developed technology does not exist until now.

US 10-2018-0135045 A

An object of the present invention is to provide an optical network capable of preventing frame collision and a communication method therein.

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 a wavelength of a 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 an optical signal is received from a specific optical node among the optical nodes, the wavelength conversion node converts the wavelength of the received optical signal into wavelengths of optical nodes other than the specific optical node, and converts the converted wavelengths to wavelengths of other optical nodes. The branch forwards 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 the wavelength of the received optical signal into a fundamental wavelength when an optical signal is received from a specific optical node among the optical nodes, and the optical signal having the converted fundamental wavelength to forward 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 for receiving an optical signal from the optical node; and a wavelength converter converting the wavelength of the received optical signal into 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 processing unit for receiving and processing 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: receiving, by a wavelength conversion node, an optical signal having a first wavelength transmitted from a source node; converting, by the wavelength conversion node, the wavelength of the received optical signal to a second wavelength of a destination node; and forwarding, by the wavelength conversion node, 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 comprises: receiving, by a wavelength conversion node, an optical signal transmitted from a source node; converting, by the wavelength conversion node, the wavelength of the received optical signal into wavelengths of optical nodes other than the source node; and broadcasting, by the wavelength conversion node, 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.

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

The optical network according to the present invention uses a wavelength division multiplexing technique to prevent frame collisions because each optical node uses a different wavelength and the wavelength conversion node controls the optical signal transmitted to the optical node in the middle.

1 is a diagram illustrating 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 illustrating an optical network according to a second embodiment of the present invention.
4 is a diagram illustrating an optical network according to a third embodiment of the present invention.

As used herein, the singular expression includes the plural expression unless the context clearly dictates otherwise. In this specification, terms such as “consisting of” or “comprising” should not be construed as necessarily including all of the various components or various steps described in the specification, some of which components or some steps are It should be construed that it may not include, or may 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 as hardware or software, or a combination of hardware and software. .

The present invention relates to an optical network and a communication method therein, and it is possible to prevent frame collision.

According to an embodiment, the optical network can prevent frame collision by setting each optical node to have a different wavelength using wavelength division multiplexing technology. This frame collision avoidance technique is applicable to both a unicast communication method and a broadcasting communication method.

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 seven optical nodes. However, a plurality of optical nodes is sufficient, and the number of optical nodes is not limited to seven optical nodes.

Referring to FIG. 1 , the optical network of this embodiment includes 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) may be included.

The optical nodes A to G may each perform optical communication and may be connected through one channel. Accordingly, the optical nodes A to G may transmit/receive an optical signal including a frame through the channel.

According to an embodiment, the optical nodes A to G may use different wavelengths, ie, transmit or receive optical signals of different wavelengths. For example, the first optical node A may transmit/receive an optical signal having a first wavelength λ1, and the second optical node B may transmit/receive an optical signal having a second wavelength λ2. and the third optical node C may transmit/receive an optical signal having a third wavelength λ3. The fourth optical node D may transmit/receive an optical signal having a fourth wavelength λ4, and the fifth optical node E may transmit/receive an optical signal having a fifth wavelength λ5, and the sixth optical node D may transmit/receive an optical signal having a fifth wavelength λ5. The optical node F may transmit/receive an optical signal having a sixth wavelength λ6, and the seventh optical node G may transmit/receive an optical signal having a seventh wavelength [lambda]7.

According to an embodiment, the 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 thereto Another optical signal can be transmitted to the next coupler. Here, the partial optical signal may mean an optical signal having a wavelength of an optical node connected thereto.

The wavelength conversion node 100 analyzes the optical signal upon reception of the optical signal to identify a destination node of the optical signal, converts the wavelength of the optical signal into the identified wavelength of the destination node, and has the converted wavelength An optical signal may 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 converts the wavelength of the optical signal from λ6 to 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 at the destination node not to collide. That is, the wavelength conversion node 100 may control the destination node not to receive the same optical signals 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 .

Also, 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 circulating indefinitely 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 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. A coupler 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 such an 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 transmitted at the same time 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.

In order to solve this problem, in the optical network of the present invention, each optical node A to G uses a different wavelength. Of course, the optimal technique for preventing frame collision is that 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 into the wavelength of the destination node, the converted wavelength An optical signal having ? may be transmitted to the destination node. That is, the wavelength conversion node 100 may perform a role of relaying and controlling the optical signal.

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

In this case, the wavelength conversion node 100 may control the optical signals not to 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 at which the optical signals arrive at the destination node D, the forwarding time may be controlled so that a collision does not occur.

On the other hand, since the optical network uses the unicast method, the wavelength conversion node 100 forwards the first optical signal transmitted from the optical node A to the optical node C after wavelength conversion, and the optical node B After wavelength conversion of the second optical signal transmitted from , it may be forwarded in the direction of the optical node (D).

3 is a diagram illustrating 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 the present 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) may be included.

The optical nodes A to G may use different wavelengths.

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

For example, when an optical signal having a wavelength λ1 transmitted from the optical node A is received to 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 illustrating an optical network according to a third embodiment of the present invention. In FIG. 3 , the optical network uses a broadcasting communication scheme.

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) may be included.

The optical nodes A to G may use different wavelengths.

The wavelength conversion node 400 may convert the wavelength of the received optical signal into a fundamental wavelength λ 0 , regardless of which optical node the optical signal is received, and broadcast the optical signal having a wavelength of λ 0 . Here, the fundamental wavelength λ 0 may be a wavelength not used for transmitting an optical signal in each of the optical nodes A to G.

That is, the optical nodes A to G may 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 increase the cost while reducing traffic compared to the optical communication method of the second embodiment.

Although not described above, the wavelength conversion node includes a communication unit for receiving an optical signal from an optical node and a wavelength conversion for converting the wavelength of the received optical signal into one of a wavelength of a destination node, a wavelength of an optical node different from the optical node, or a fundamental wavelength may include wealth.

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

In addition, the optical node and the destination node use different wavelengths, and the fundamental wavelength is different from the wavelengths of the optical node and the destination node, and the optical node receives or processes an optical signal having the fundamental wavelength. can, but may not be able to forward.

The optical node may include a communication unit that transmits and receives an optical signal, an optical signal generator that generates an optical signal, and a signal processor that processes the received optical signal.

On the other hand, the components of the above-described embodiment can be easily grasped from a process point of view. That is, each component may be identified as a respective process. In addition, the process of the above-described embodiment can be easily understood from the point of view of the components of the apparatus.

In addition, the technical contents described above may be implemented in the form of program instructions that can be executed through various computer means and recorded in a computer-readable medium. The computer-readable medium may include program instructions, data files, data structures, etc. 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 available to those skilled in the art of computer software. Examples of the computer-readable recording medium include magnetic media such as hard disks, floppy disks and magnetic tapes, optical media such as CD-ROMs and DVDs, and magnetic such as floppy disks. - includes magneto-optical media, and hardware devices specially configured to store and execute program instructions, such as ROM, RAM, flash memory, and the like. Examples of program instructions include not only machine language codes such as those generated by a compiler, but also high-level language codes that can be executed by a computer using an interpreter or the like. A hardware device may 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 the purpose of illustration, and various modifications, changes, and additions will be possible within the spirit and scope of the present invention by those skilled in the art having ordinary knowledge of the present invention, and such modifications, changes and additions should be regarded as belonging to the following claims.

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

Claims (14)

delete delete delete delete delete In an optical network,
a plurality of optical nodes; and
a wavelength conversion node;
The wavelength conversion node converts the wavelength of the received optical signal into a fundamental wavelength when an optical signal is received from a specific optical node among the optical nodes regardless of which optical nodes receive the optical signal, and the converted fundamental wavelength Forwarding an optical signal having a wavelength, and having a function of terminating the transmission of an optical signal to prevent the optical signal from being cycled indefinitely in the optical network,
The fundamental wavelength is a wavelength that the optical nodes do not use for optical signal transmission,
and the optical node can receive and process the optical signal having the fundamental wavelength, but cannot generate and forward the optical signal having the fundamental wavelength.
delete delete In the wavelength conversion node,
a communication unit for receiving an optical signal from an optical node; and
A wavelength converter for converting the wavelength of the received optical signal into a fundamental wavelength regardless of which optical node the optical signal is received from;
The wavelength conversion unit forwards the optical signal having the converted wavelength through the communication unit,
wherein the wavelength conversion node has a function of terminating the transmission of an optical signal to prevent the optical signal from being cycled infinitely by the plurality of optical nodes,
The fundamental wavelength is a wavelength that the optical node does not use for optical signal transmission,
The optical node may receive and process the optical signal having the fundamental wavelength, but cannot generate and forward the optical signal having the fundamental wavelength.
The wavelength conversion node of claim 9, wherein the optical node and the destination node use different wavelengths, and the fundamental wavelength is different from the wavelengths of the optical node and the destination node.
delete delete delete receiving, by the wavelength conversion node, an optical signal transmitted from the optical node;
converting, by the wavelength conversion node, the wavelength of the received optical signal to a fundamental wavelength irrespective of from which optical nodes the optical signal is received; and
forwarding, by the wavelength conversion node, an optical signal having the fundamental wavelength;
The fundamental wavelength is a wavelength that the optical nodes do not use for optical signal transmission,
The optical node may receive and process the optical signal having the fundamental wavelength, but cannot generate and forward the optical signal having the fundamental wavelength;
and the wavelength conversion node has a function of terminating the transmission of the optical signal to prevent the optical signal from being cycled indefinitely by the plurality of optical nodes.

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