KR20220019635A - Optical communication device and optical communication system including the same - Google Patents

Abstract

According to an aspect of the present disclosure, an optical communication device is disclosed. The optical communication device includes: a first channel card that converts an input first signal into a first optical signal, and outputs the first optical signal to one of a first mux/demux connected to the first optical path and a second mux/demux connected to the second optical path; a second channel card that converts an input second signal into a second optical signal and outputs to second optical signal to one of the first mux/demux and the second mux/demux; and a controller that monitors states of the first and second optical paths to determine one to which the first optical signal and the second optical signal are respectively output among the first mux/demux and the second mux/demux.

Description

Optical communication device and optical communication system including same

The present disclosure relates to an optical communication device and an optical communication system including the same, and more specifically, to an optical communication device capable of individually switching optical paths for a plurality of optical communication modules therein, and an optical communication device including the same It is about an optical communication system.

Research and development on a passive optical network (hereinafter referred to as 'WDM-PON') based on Wavelength Division Multiplexing (WDM) is being actively conducted. In WDM-PON, communication is performed between a transmitting device and a receiving device using a wavelength determined for each receiving device. As such, in WDM-PON, since a dedicated wavelength is used for each receiving device, security is excellent, large-capacity communication services are possible, and other transmission technologies (eg, Link Rate, Frame Format, etc.) can be applied. have an advantage

In such a WDM-PON, when communication is performed through a single optical line, the entire network may become out of service if the corresponding optical line is disconnected or attenuation is increased due to aging. In order to solve this problem, in WDM-PON, the optical path is duplicated, and when a failure is found in the main optical path, communication is performed through the sub optical path.

However, according to this WDM-PON configuration, even when an error occurs in only one of a plurality of channel cards formed in a transmission-side device, for example, a COT (Central Office Terminal), the entire optical path must be switched to a sub-optical path. This causes inconvenience in that a receiving device connected to other normal channel cards, for example, RT (Remote Terminal), etc. has to perform communication through a sub optical path.

An object of the present disclosure is to provide an optical communication device capable of individually switching optical paths only for an optical communication module in which an error has occurred among a plurality of optical communication modules configured therein, and an optical communication system including the same.

According to an aspect of the present disclosure, an input first signal is converted into a first optical signal, and the first signal is converted into any one of a first mux/demux connected to a first optical path and a second mux/demux connected to a second optical path. 1 a first channel card for outputting an optical signal; a second channel card that converts an input second signal into a second optical signal and outputs the second optical signal through one of the first mux/demux and the second mux/demux; and a mux/demux to which the first optical signal and the second optical signal are respectively output from among the first mux/demux and the second mux/demux by monitoring states of the first optical path and the second optical path A controller for determining a; including, an optical communication device is disclosed.

According to an exemplary embodiment, the first channel card may include: an optical transmission/reception module for converting the first signal into the first optical signal of a preset wavelength and outputting; and a first switch for connecting the optical transmission/reception module to the first mux/demux or the second mux/demux according to a first control signal, wherein the controller includes: the first optical path and It is possible to output the first control signal to the first switch by monitoring the state of the second optical path.

According to an exemplary embodiment, the first channel card further includes a second switch for connecting the optical transmission/reception module to the first mux/demux or the second mux/demux according to a second control signal. and the optical transmission/reception module may convert an optical signal input through the second switch into an electrical signal, and the controller monitors the states of the first optical path and the second optical path to A second control signal may be output to the second switch.

According to an exemplary embodiment, the controller may monitor the state of the first optical path by using first state information received from the first monitoring device connected to the first optical path, and the second optical path connected to the second optical path. 2 It is possible to monitor the state of the second optical path by using the second state information received from the monitoring device.

According to another aspect of the present disclosure, in the optical communication device connected to the above-described optical communication device through a first optical path or a second optical path, the first light is connected to the first optical path and input from the first optical path A first coupler for outputting a portion of the signal by coupling (coupling); a second coupler connected to the second optical path and coupling and outputting a portion of the second optical signal input from the second optical path; and a third coupler connected to the first coupler and the second coupler, and outputting the optical signals inputted from the first coupler and the second coupler by combining them.

According to an exemplary embodiment, the third coupler may branch an input third optical signal and output the third optical signal to the first coupler and the second coupler, respectively, and the first coupler may branch the input third optical signal. A part of the signal may be output to the first optical path, and the second coupler may output another part of the branched input third optical signal to the second optical path.

According to an exemplary embodiment, the third optical signal may be branched and transmitted to the optical communication device through any one of the first optical path and the second optical path.

According to another aspect of the present disclosure, there is provided a first optical communication device, comprising: a first optical communication device that converts an input first signal into a first optical signal and transmits the converted signal, and converts an input second signal into a second optical signal for transmission; and a second optical communication device connected to the first optical communication device through a first optical path or a second optical path to receive at least one of the first optical signal and the second optical signal. The optical communication device converts the first signal into the first optical signal, and outputs the first optical signal to one of a first mux/demux and a second mux/demux connected to a first optical path. 1 channel card; a second channel card for converting the second signal into the second optical signal and outputting the second optical signal through one of the first mux/demux and the second mux/demux; and a mux/demux to which the first optical signal and the second optical signal are respectively output from among the first mux/demux and the second mux/demux by monitoring states of the first optical path and the second optical path A controller for determining a; including, an optical communication system is disclosed.

According to an exemplary embodiment, the first channel card may include: an optical transmission/reception module for converting the first signal into the first optical signal of a preset wavelength and outputting; and a first switch for connecting the optical transmission/reception module to the first mux/demux or the second mux/demux according to a first control signal, wherein the controller includes: the first optical path and It is possible to output the first control signal to the first switch by monitoring the state of the second optical path.

According to an exemplary embodiment, the first channel card further includes a second switch for connecting the optical transmission/reception module to the first mux/demux or the second mux/demux according to a second control signal. and the optical transmission/reception module may convert the optical signal input through the second switch into an electrical signal, and the controller monitors the first optical path and the second optical path to control the second A signal may be output to the second switch.

According to an exemplary embodiment, the controller may monitor the state of the first optical path by using first state information received from the first monitoring device connected to the first optical path, and the second optical path connected to the second optical path. 2 It is possible to monitor the state of the second optical path by using the second state information received from the monitoring device.

According to an exemplary embodiment, the second optical communication device is connected to the first optical path and receives a part of any one optical signal input from the first optical signal among the first optical signal and the second optical signal. A first coupler to output by coupling (coupling); a second coupler connected to the second optical path and coupling and outputting a portion of the first optical signal and another optical signal input from the second optical signal; and a third coupler connected to the first coupler and the second coupler, and outputting the optical signals inputted from the first coupler and the second coupler by combining them.

According to an exemplary embodiment, the third coupler may branch an input third optical signal and output it to the first coupler and the second coupler, respectively, and the first coupler may include the branched input third optical signal. A part of the three optical signals may be output to the first optical path, and the second coupler may output another part of the branched input third optical signal to the second optical path.

According to an exemplary embodiment, the third optical signal may be branched and transmitted to the first optical communication device through any one of the first optical path and the second optical path.

An optical communication device and an optical communication system including the same according to embodiments of the present disclosure may individually switch optical paths only for an optical communication module in which an error has occurred among a plurality of optical communication modules configured therein.

In order to more fully understand the drawings recited in the Detailed Description of the present disclosure, a brief description of each drawing is provided.
1 is a block diagram of an optical communication system according to an embodiment of the present disclosure.
2 is a block diagram of an optical communication device according to an embodiment of the present disclosure.
3 is a block diagram of a channel card according to an embodiment of the present disclosure.

Since the technical spirit of the present disclosure may have various changes and may have various embodiments, specific embodiments will be illustrated in the drawings and described in detail. However, this is not intended to limit the technical spirit of the present disclosure to specific embodiments, and it should be understood to include all changes, equivalents or substitutes included in the scope of the technical spirit of the present disclosure.

In describing the technical idea of the present disclosure, if it is determined that the detailed description of the related known technology may unnecessarily obscure the spirit of the present disclosure, the detailed description thereof will be omitted. In addition, numbers (eg, first, second, etc.) used in the description process of the present application are only identification symbols for distinguishing one component from other components.

Also, in this application, when it is referred to as “connected” or “connected” to another component, the component may be directly connected to or directly connected to the other component, but in particular the opposite is true. Unless there is a description to be used, it will be understood that it may be connected or connected through another element in the middle.

In addition, terms such as "~ unit", "~ group", "~ character", etc. described herein mean a unit for processing at least one function or operation, which is a processor, a microprocessor, Microcontroller, CPU (Central Processing Unit), GPU (Graphics Processing Unit), APU (Accelerate Processor Unit), DSP (Digital Signal Processor), ASIC (Application Specific Integrated Circuit), FPGA (Field Programmable Gate Array) It may be implemented in hardware such as, software, or a combination of hardware and software.

In addition, it is intended to clarify that the classification of the constituent parts in the present application is merely a classification for each main function that each constituent unit is responsible for. That is, two or more components to be described below may be combined into one component, or one component may be divided into two or more for each more subdivided function. In addition, each of the constituent units to be described below may additionally perform some or all of the functions of other constituent units in addition to the main function it is responsible for. Of course, it can also be performed by being dedicated to it.

The optical communication system according to the embodiments of the present disclosure is located in a remote location from each other and is configured with optical communication devices that transmit and receive optical signals through corresponding optical communication modules (optical transceivers) to various optical communication networks based on WDM-PON. can be applied

For example, the optical communication system may configure an optical transport network that is a sub-network constituting a fronthaul segment of a radio access network architecture. However, the present disclosure is not limited thereto, and the technical spirit of the present disclosure may be applied to a midhaul segment and a backhaul segment of the radio access network architecture. As another example, the optical communication system may be applied to an optical subscriber network. As another example, the optical communication system may be applied to a distributed antenna system (DAS) for resolving a shadow area of a base station.

Hereinafter, for convenience of description, a case in which the optical communication system constitutes the fronthaul segment of the above-described radio access network architecture, a digital unit or a baseband unit at the central office side ) and an optical communication device (eg, COT) connected to a remote unit (Remote Unit) or a remote radio head (Remote Radio Head) connected to a system including an optical communication device (eg, RT) Examples will be mainly described.

Hereinafter, various embodiments according to the spirit of the present disclosure will be described in detail in turn.

1 is a block diagram of an optical communication system according to an embodiment of the present disclosure.

Referring to FIG. 1 , the optical communication system 100 according to an embodiment of the present disclosure may include a COT 110 and n RTs 120-1 to 120-n (where n is a natural number). there is. The COT 110 and the n RTs 120-1 to 120-n may form a ring topology.

For example, the optical communication system 100 according to an embodiment of the present disclosure may form a ring topology with the COT 110 and two RTs 120 - 1 and 120 - 2 . At this time, two optical paths may be connected to the COT 110 . One of the two optical paths connected to the COT 110 may be connected to the first RT 120-1, and the other one may be connected to the second RT 120-2. Also, the first RT 120 - 1 and the second RT 120 - 2 may be interconnected through separate optical paths. Due to this, the COT 110 and the plurality of RTs 120-1 to 120-n may form a ring topology.

The COT 110 may be a device that multiplexes base station signals on the central office side (or central office side) and transmits them to one or more connected RTs (one or more of 120-1 to 120-n). For example, the COT 110 may receive a signal from a digital unit (DU) (not shown) and convert it into a WDM signal. In addition, the COT 110 may transmit the WDM signal to one or more RTs (one or more of 120-1 to 120-n) connected through an optical line. In the example of FIG. 1 , the COT 110 may transmit a WDM signal to the first RT 120-1 through a first optical path, and transmit a WDM signal to an n-th RT 120-n through a second optical path. can Meanwhile, the base station signal may be a baseband signal conforming to a standard of a fronthaul link such as Common Public Radio Interface (CPRI), Open Base Station Architecture Initiative (OBSAI), and Open Radio Equipment Interface (ORI).

The COT 110 may transmit a WDM signal to the first RT 120-1 through the first optical path, and the first RT 120-1 filters the signal transmitted thereto and then transmits the remaining signals to the second RT. You can send it to (120-2). The second RT 120 - 2 may filter the signal transmitted to the second RT 120 - 1 among the signals received by the first RT 120 - 1 , and then transmit the remaining signals to the third RT 120 - 3 . In this way, the n-th RT (120-n) receives a signal from the n-1 th RT (120-n-1) and then transmits a preset signal (eg, WDM signal, etc.) to the COT through the second optical path. 110 (of course, a preset signal may not be transmitted).

Each of the RTs 120-1 to 120-n is located on the side of an individual base station and is a device in charge of an interface with a remote unit (RU) (not shown) and the like. Each of the RTs 120-1 to 120-n may be connected to the COT 110 and transmit a signal received from the COT 110 to an RU or the like. As described above, the COT 110 and each RT 120-1 to 120-n may form a ring topology.

Meanwhile, the COT 110 according to an embodiment of the present disclosure may switch the transmitted optical path by controlling n channel cards individually connected to each of the RTs 120-1 to 120-n. Hereinafter, a connection switching operation between the COT 110 and the RTs 120-1 to 120-2 will be described in more detail.

2 is a block diagram of an optical communication device according to an embodiment of the present disclosure.

Referring to FIG. 2 , the COT 110 according to an embodiment of the present disclosure may include m channel cards 140-1, 140-2 to 140-m (where m is a natural number). Each channel card 140-1, any one of 140-2 to 140-m of the COT 110 is to be connected to the first mux/demux 130-1 and the second mux/demux 130-2. can The first mux/demux 130 - 1 and/or the second mux/demux 130 - 2 may be formed inside the COT 110 . Also, the first mux/demux 130 - 1 may be connected to the first RT 120 - 1 through a first optical path. Also, the second mux/demux 130 - 2 may be connected to the nth RT 120 - n through a second optical path. The first RT 120-1 may be connected to the second RT 120-2 through another optical path, and the second RT 120-2 may be connected to the third RT 120-3 through another optical path. In the same way, the n-1 th RT (120-n-1) may be connected to the n-th RT (120-n) through another optical path. That is, the COT 110 and the m RTs 120-1 to 120-m may form a ring topology.

Also, the first optical path connecting the first mux/demux 130-1 and the first RT 120-1 may be connected to the first monitoring device 150-1, MPD#1. The first monitoring device 150-1 may include a photodiode for monitoring the performance of the first optical path. Also, the first monitoring device 150-1 may be connected to the controller 160 (MCU). Therefore, the controller 160 will be able to determine the performance of the first optical path through the photodiode of the first monitoring device 150-1. For example, if the optical power value detected by the first monitoring device 150-1 is less than or equal to a preset value, the controller 160 may determine that the performance of the first optical path is deteriorated.

Also, a second optical path connecting the second mux/demux 130 - 2 and the nth RT 120 - n may be connected to the second monitoring device 150 - 2 ( MPD#2 ). The second monitoring device 150-2 may include a photodiode for monitoring the performance of the second optical path. Also, the second monitoring device 150 - 2 may be connected to the controller 160 (MCU). Therefore, the controller 160 will be able to determine the performance of the second optical path through the photodiode of the second monitoring device 150-2. For example, the controller 160 may determine that the performance of the second optical path is degraded when the optical power value in the second monitoring device 150 - 2 is less than or equal to a preset value. The first monitoring device 150 - 1 , the second monitoring device 150 - 2 and/or the controller 160 may be formed inside the COT 110 . In addition, since various methods other than the above-described method may be applied to the method for the controller 160 to determine the performance of the first optical path and/or the second optical path, a detailed description thereof will be omitted.

Each of the channel cards 140 - 1 to 140 - m may be selectively connected to the first mux/demux 130 - 1 and the second mux/demux 130 - 2 . For example, the first channel card 140-1 may be selectively connected to the first mux/demux 130-1 or the second mux/demux 130-2, and the second channel card 140 -2) may be selectively connected to the first mux/demux 130-1 or the second mux/demux 130-2, and the n-th channel card 140-n may also be connected to the first mux/demux 130-2. It may be selectively connected to the 130 - 1 or the second mux/demux 130 - 2 . In this case, the mux/demux to which each channel card 140-2 to 140-m is connected may not be unified. For example, the first channel card 140-1 and the n-th channel card 140-n are connected to the first mux/demux 130-1, and the second channel card 140-2 is the second channel card 140-n. 2 may be connected to the mux/demux 130 - 2 .

Hereinafter, referring to FIG. 3 for an operation in which each channel card 140-1 to 140-m is selectively connected to the first mux/demux 130-1 or the second mux/demux 130-2 to be described in detail.

3 is a block diagram of a channel card according to an embodiment of the present disclosure.

Referring to FIG. 3 , each channel card 140-m according to an embodiment of the present disclosure includes a first optical transmission/reception module 310, Small Form-factor Pluggable (SFP) #1), a monitoring unit ( 320), a second optical transmission/reception module 330 (SFP#2), a first switch 340 - 1 and a second switch 340 - 2 may be included. Here, the channel card 140-m means a configuration for converting an input electrical signal into an optical signal or converting an optical signal into an electrical signal. Also, the monitoring unit 320 , the first switch 340 - 1 and/or the second switch 340 - 2 of each channel card 140 - m may be connected to the controller 160 .

First, the first optical transmission/reception module 310 may convert an input optical signal into an electrical signal and output it to the monitoring unit 320 . In addition, the first optical transmission/reception module 310 may convert the electrical signal input from the monitoring unit 320 into an optical signal and output it to an external device (eg, DU, etc.) connected through an optical cable.

The monitoring unit 320 may determine whether a normal signal is input by monitoring the input electrical signal. For example, the monitoring unit 320 may determine whether the signal is normal by determining the noise ratio of the electrical signal. When it is determined that the input electrical signal is normal, the monitoring unit 320 may output it to the second optical transmission/reception module 330 . Conversely, the monitoring unit 320 may check whether the electrical signal input from the second optical transmission/reception module 330 is normal, and if it is normal, output it to the first optical transmission/reception module 310 .

Meanwhile, the monitoring unit 320 may be connected to the controller 160 to monitor the state of the first optical path and/or the second optical path through a signal input from the controller 160 . This will be described later.

The second optical transmission/reception module 330 may convert the electrical signal input from the monitoring unit 320 into an optical signal of a preset wavelength and output it to the first switch 340-1. In addition, the second optical transmission/reception module 330 may convert the optical signal input from the second switch 340 - 2 into an electrical signal and output the converted optical signal to the monitoring unit 320 . That is, the first switch 340-1 switches the signal transmitted from the COT 110 to each RT 120-1 to 120-n, and the second switch 340-2 is each RT 120-1. to 120-n), the signal transmitted to the COT 110 may be switched.

On the other hand, as described above, the controller 160 may check the state of the first optical path using the information (hereinafter, referred to as 'first state information') checked by the first monitoring device 150-1. For example, it is assumed that only the first channel card 140-1 among m channel cards outputs an optical signal through the first optical path through the first mux/demux 130-1. At this time, the controller 160 determines that the state of the first optical path is normal if the optical power (ie, the first state information) checked through the photodiode of the first monitoring device 150-1 is greater than or equal to a preset threshold value, The optical signal of the first channel card 140-1 may be maintained to be output to the first optical path through the first mux/demux 130-1. On the other hand, the controller 160 determines that the state of the first optical path is abnormal when the optical power checked from the photodiode of the first monitoring device 150-1 is less than a preset threshold value, and the first channel card 140-1 The control signal may be output to the first switch 340-1 so that the optical signal of is output to the second optical path through the second mux/demux 130-2.

In the same way, the controller 160 may check the state of the second optical path by using the information (hereinafter, referred to as 'second state information') checked by the second monitoring device 150-2. For example, it is assumed that only the first channel card 140-1 among the m channel cards receives an optical signal from the second optical path through the second mux/demux 130-2. At this time, the controller 160 determines that the state of the second optical path is normal when the optical power checked by the photodiode of the second monitoring device 150-2 is greater than or equal to a preset threshold value, and each RT (120-1 to 120-) n) may be maintained to be received by the first channel card 140-1 through the second optical path and the second mux/demux 130-2. On the other hand, the controller 160 determines that the state of the second optical path is abnormal when the optical power checked by the photodiode of the second monitoring device 150-2 is less than a preset threshold value, and the first channel card 140-1) may output a control signal to the second switch 340 - 2 to receive the optical signal through the first optical path and the first mux/demux 130 - 1 .

The above-described operation of the controller 160 may be individually applied to each of the second channel card 140-2 to the mth channel card 140-m. Accordingly, each of the channel cards 140-1 to 140-m may be selectively connected to the first optical path or the second optical path to independently provide an optical communication service.

Meanwhile, although not shown, each of the n RTs 120-1 to 120-n may include a first coupler connected to a first optical path and a second coupler connected to a second optical path. In addition, each of the n RTs 120 - 1 to 120 - n may include a first coupler and a third coupler connected to the second coupler.

The first coupler may output a signal input from the first optical path to the third coupler, and may output a signal input from the third coupler to the first optical path. Similarly, the second coupler may output a signal input from the second optical path to the third coupler, and may output a signal inputted from the third coupler to the second optical path. The third coupler may combine the signals input from the first coupler and the second coupler and output them to the corresponding RT (any one of 120-1 to 120-n), and the RT (one of 120-1 to 120-n) Either) may be output to the first coupler and the second coupler by branching the optical signal input from the inside. For example, the third coupler may transmit half of the optical signal input inside the RT (any one of 120-1 to 120-n) to the first coupler and the other half to the second coupler.

For this reason, even when each channel card 140-1 to 140-m of the COT 110 selectively transmits an optical signal through either the first optical path or the second optical path, each RT 120-1 to 120 -m) may receive it through the first coupler or the second coupler formed therein. In addition, when transmitting the optical signal to the COT 110 , each of the RTs 120 - 1 to 120 -n may transmit the optical signal through both the first optical path and the second optical path. Each channel card (140-1 to 140-m) of the COT (110) receives the optical signal transmitted from each RT (120-1 to 120-n) through any one of the first optical path and the second optical path can do.

As described above, the COT 110 according to the present disclosure may individually change the optical path only for the channel card whose optical communication state is abnormal among the plurality of channel cards 140-1 to 140-m configured therein. As a result, channel cards with normal optical communication status can maintain optical communication through the optical path through which they were originally communicated.

Although the above has been described with reference to a preferred embodiment of the present disclosure, those of ordinary skill in the art may change the present disclosure in various ways without departing from the spirit and scope of the present disclosure as set forth in the claims below. It will be appreciated that modifications and variations are possible.

100: optical communication system
110: COT
120-1 to 120-n: first to nth RT

Claims (11)

a first signal for converting an input first signal into a first optical signal and outputting the first optical signal through one of a first mux/demux connected to a first optical path and a second mux/demux connected to a second optical path channel card;
a second channel card that converts an input second signal into a second optical signal and outputs the second optical signal through one of the first mux/demux and the second mux/demux; and
The state of the first optical path and the second optical path is monitored to select a mux/demux from which the first optical signal and the second optical signal are respectively output from among the first mux/demux and the second mux/demux. the determining controller;
Including, an optical communication device.
According to claim 1,
The first channel card,
an optical transmission/reception module for converting the first signal into the first optical signal of a preset wavelength and outputting it; and
a first switch for connecting the optical transmission/reception module to the first mux/demux or the second mux/demux according to a first control signal;
The controller monitors the states of the first optical path and the second optical path to output the first control signal to the first switch, an optical communication device.
3. The method of claim 2,
The first channel card,
A second switch for connecting the optical transmission/reception module to the first mux/demux or the second mux/demux according to a second control signal;
The optical transmission/reception module converts the optical signal input through the second switch into an electrical signal,
The controller, monitoring the state of the first optical path and the second optical path to output the second control signal to the second switch, an optical communication device.
According to claim 1,
The controller is
Monitoring the state of the first optical path by using the first state information received from the first monitoring device connected to the first optical path,
An optical communication device for monitoring the state of the second optical path by using second state information received from a second monitoring device connected to the second optical path.
a first optical communication device that converts an input first signal into a first optical signal and transmits the converted signal, and converts an input second signal into a second optical signal for transmission; and
a second optical communication device connected to the first optical communication device through a first optical path or a second optical path to receive at least one of the first optical signal and the second optical signal;
including,
The first optical communication device,
a first channel card for converting the first signal into the first optical signal and outputting the first optical signal to one of a first mux/demux and a second mux/demux connected to a first optical path;
a second channel card for converting the second signal into the second optical signal and outputting the second optical signal through one of the first mux/demux and the second mux/demux; and
The state of the first optical path and the second optical path is monitored to select a mux/demux from which the first optical signal and the second optical signal are respectively output from among the first mux/demux and the second mux/demux. A controller for determining; including, an optical communication system.
6. The method of claim 5,
The first channel card,
an optical transmission/reception module for converting the first signal into the first optical signal of a preset wavelength and outputting it; and
a first switch for connecting the optical transmission/reception module to the first mux/demux or the second mux/demux according to a first control signal;
The controller monitors the states of the first optical path and the second optical path to output the first control signal to the first switch, an optical communication system.
7. The method of claim 6,
The first channel card,
A second switch for connecting the optical transmission/reception module to the first mux/demux or the second mux/demux according to a second control signal;
The optical transmission/reception module converts the optical signal input through the second switch into an electrical signal,
The controller monitors the first optical path and the second optical path to output the second control signal to the second switch, an optical communication system.
6. The method of claim 5,
The controller is
Monitoring the state of the first optical path by using the first state information received from the first monitoring device connected to the first optical path,
An optical communication system for monitoring the state of the second optical path by using second status information received from a second monitoring device connected to the second optical path.
6. The method of claim 5,
The second optical communication device,
a first coupler connected to the first optical signal and outputting by coupling a portion of any one optical signal input from the first optical signal among the first optical signal and the second optical signal;
a second coupler connected to the second optical path and coupling and outputting a portion of the first optical signal and another optical signal input from the second optical signal; and
A third coupler connected to the first coupler and the second coupler, the third coupler combining and outputting optical signals input from the first coupler and the second coupler;
10. The method of claim 9,
The third coupler branches the input third optical signal and outputs it to the first coupler and the second coupler, respectively,
The first coupler outputs a part of the branched input third optical signal to the first optical path,
The second coupler outputs another part of the branched input third optical signal to the second optical path.
11. The method of claim 10,
The third optical signal is branched and transmitted to the first optical communication device through any one of the first optical path and the second optical path.

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