KR20210077632A - Optical transceiver and method for automatic setting wavelength thereof - Google Patents

Abstract

According to one aspect of the present invention, disclosed is an optical transceiver which comprises: an optical transmitter that sequentially generates a plurality of optical transmission signals individually including transmission wavelength information and outputs them to a connected multiplexer/demultiplexer; and a controller for generating the transmission wavelength information for each of the plurality of optical transmission signals. Therefore, the optical transceive can automatically set a wavelength without an administrator's visit.

Description

OPTICAL TRANSCEIVER AND METHOD FOR AUTOMATIC SETTING WAVELENGTH THEREOF

The present disclosure relates to an optical transceiver and a method for automatically setting a wavelength thereof.

Wavelength-division multiplexing (WDM) is a technology that can transmit multiple optical signals simultaneously through the same optical fiber, which is achieved by having each optical signal have a different wavelength. On the transmission side of the WDM-based optical communication system, various signals of different wavelengths are transmitted through the same optical fiber. On the receiving side of a WDM-based optical communication system, the wavelengths are often separated. The advantage of the WDM system is that it effectively provides a virtual optical fiber by allowing one optical fiber to carry multiple optical signals with different carrier wavelengths.

In general, optical communication devices on the transmitting and receiving sides constituting the WDM-based optical communication system are located several to several tens of kilometers apart from each other. In addition, a plurality of corresponding optical transceivers on both sides may be connected to a multiplexer/demultiplexer through an optical cable to transmit/receive optical signals to and from each other at a remote location. For such optical communication, it is necessary to set the wavelengths for transmission and reception of the corresponding optical transceivers on both sides to form an optical link. Another problem is that it takes a long time.

Korean Patent Publication No. 10-2016-0043655

In order to solve the above problems, the present disclosure is to provide an optical transceiver capable of automatically setting a wavelength without an administrator's visit, and a method for automatically setting a wavelength thereof.

The technical tasks to be achieved by the technical spirit of the present disclosure are not limited to the tasks mentioned above, and another task not mentioned will be clearly understood by those skilled in the art from the following description.

According to an aspect of the present disclosure, there is provided an optical transmitter comprising: an optical transmitter for sequentially generating a plurality of optical transmission signals each including transmission wavelength information and outputting the plurality of optical transmission signals to a connected multiplexer/demultiplexer; and a controller configured to generate the transmission wavelength information for each of the plurality of optical transmission signals.

According to an exemplary embodiment, the optical transmitter may generate each of the plurality of optical transmission signals by superimposing an optical signal corresponding to the transmission wavelength information and an optical signal having a wavelength indicated by the transmission wavelength information. .

According to an exemplary embodiment, the optical signal corresponding to the transmission wavelength information and the optical signal having a wavelength indicated by the transmission wavelength information may be optical signals of different channels.

According to an exemplary embodiment, the channel of the optical signal corresponding to the transmission wavelength information may be an Auxiliary Management and Control Channel (AMCC).

According to an exemplary embodiment, one optical transmission signal among the plurality of optical transmission signals may be transmitted to another optical transceiver through the multiplexer/demultiplexer.

According to an exemplary embodiment, through the multiplexer/demultiplexer, the optical response is transmitted from the other optical transceiver in response to any one optical transmission signal among the plurality of optical transmission signals and includes reception wavelength information and transmission wavelength information. may further include an optical receiver configured to receive a signal, wherein the controller includes: a transmission wavelength and reception for communication with the other optical transceiver based on the reception wavelength information and the transmission wavelength information included in the optical response signal wavelengths can be identified.

According to an exemplary embodiment, the controller may generate link information with the other optical transceiver based on the identified transmission wavelength and the reception wavelength, and the optical transmitter may include an optical signal corresponding to the link information. can be generated and output to the multiplexer/demultiplexer.

According to another aspect of the present disclosure, there is provided an optical receiver comprising: an optical receiver which is transmitted from another optical transceiver and receives an optical transmission signal including transmission wavelength information through a connected multiplexer/demultiplexer; and a controller that identifies a reception wavelength for communication with the other optical transceiver based on the transmission wavelength information included in the optical transmission signal.

According to an exemplary embodiment, in response to the optical transmission signal, sequentially generating a plurality of optical response signals each including transmission wavelength information and reception wavelength information regarding the identified reception wavelength and outputting it to the multiplexer/demultiplexer An optical transmitter may be further included, and the controller may generate the transmission wavelength information and the reception wavelength information for each of the plurality of optical response signals.

According to an exemplary embodiment, the optical transmitter superimposes an optical signal corresponding to the transmission wavelength information and the reception wavelength information and an optical signal having a wavelength indicated by the transmission wavelength information to each of the plurality of optical response signals can create

According to an exemplary embodiment, the optical signal corresponding to the transmission wavelength information and the reception wavelength information and the optical signal having a wavelength indicated by the transmission wavelength information may be optical signals of different channels.

According to an exemplary embodiment, the channel of the optical signal corresponding to the transmission wavelength information and the reception wavelength information may be AMCC.

According to an exemplary embodiment, one optical response signal among the plurality of optical response signals may be transmitted to the other optical transceiver through the multiplexer/demultiplexer.

According to an exemplary embodiment, the optical receiver is transmitted in response to any one optical response signal among the plurality of optical response signals from the other optical transceiver through the multiplexer/demultiplexer and is an optical signal corresponding to optical link information. may be received, and the controller may identify a transmission wavelength for communication with the other optical transceiver based on the link information included in the optical signal.

According to embodiments of the present disclosure, wavelengths of corresponding optical transceivers may be automatically set without an administrator's visit. Accordingly, it is possible to improve convenience and reduce wavelength-related installation and maintenance costs.

In addition, there is no compatibility issue with the optical communication device on which the optical transceivers are mounted, and optical transceivers configured with the same components can be used at both ends of the link, thereby reducing system construction cost.

Effects that can be obtained in the embodiments according to the technical spirit of the present disclosure are not limited to the above-mentioned effects, and other effects not mentioned are common knowledge in the technical field to which the technical spirit of the present disclosure belongs from the description below. It can be clearly understood by those who have

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 schematic diagram of an optical communication system according to an embodiment of the present disclosure;
2 is a block diagram illustrating in more detail the main part of an optical transceiver in an optical communication system according to an embodiment of the present disclosure.
3 is a diagram schematically illustrating an exemplary optical communication system to explain a method for automatically setting a wavelength of an optical transceiver according to an embodiment of the present disclosure, and FIG. 4 is a flowchart of an exemplary method for automatically setting a wavelength of an optical transceiver.

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 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 a detailed description of a related known technology may unnecessarily obscure the spirit of the present disclosure, the detailed description thereof will be omitted. In addition, the numbers (eg, first, second, etc.) used in the description of the present application are only identifiers for distinguishing one component from other components.

In addition, in this specification, when an element is referred to as “connected” or “connected” to another element, the one element may be directly connected to or directly connected to the other element, 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 the other constituent units in addition to the main function it is responsible for, and may additionally perform some or all of the functions of the other constituent units. Of course, it may be carried out by being dedicated to it.

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

1 is a schematic diagram of an optical communication system according to an embodiment of the present disclosure, and FIG. 2 is a block diagram illustrating in more detail the main part of an optical transceiver in the optical communication system according to an embodiment of the present disclosure.

Referring to FIG. 1 , the optical communication system 10 according to an embodiment of the present disclosure includes n (n is a natural number greater than or equal to 2) first optical transceivers 1100-1 to 1100-n. Communication device 110, second optical communication devices 120-1 to 120-n each including at least one second optical transceiver, and a multiplexer/demultiplexer 130 (hereinafter referred to as mux/demux). can The first optical communication device 110 and the mux/demux 130 may be connected through an optical cable 141 , and the second optical communication devices 120-1 to 120-n and the mux/demux 130 may be connected to each other. ) may be connected through a corresponding optical cable among the optical cables 143-1 to 143-n. According to an embodiment, a plurality of sub-muxes/demuxes may be connected to the mux/demux 130 , and the second optical communication devices 120-1 to 120-n are connected to the sub-mux/demuxes. You can also form a tree topology in this way.

In some embodiments, the optical communication system 10 may configure an optical transport network that is a sub-network constituting a fronthaul segment of a radio access network architecture. In this case, the first optical communication device 110 may be a digital unit (Digital Unit, DU) or a baseband unit (BaseBand Unit, BBU) full-side termination device on the side of the central office (Central Office). The second optical communication devices 120-1 to 120-n may be remote units (RUs) or remote radio heads (RRHs). The mux/demux 130 is a remote node for splitting and combining optical signals transmitted and received between the first optical communication device 110 and the second optical communication devices 120-1 to 120-n. can be 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.

In another embodiment, the optical communication system 10 may be applied to an optical subscriber network. In this case, the first optical communication device 110 may be an optical line terminal (OLT) on the side of the central office. The second optical communication devices 120-1 to 120-n are a remote device (Remote Terminal, RT), a subscriber side optical network terminal (Optical Network Terminal, ONT), any one of the optical network unit (Optical Network Unit) can be one The mux/demux 130 is a remote node for splitting and combining optical signals transmitted and received between the first optical communication device 110 and the second optical communication devices 120-1 to 120-n. can be

In another embodiment, the optical communication system 10 may be applied to a Distributed Antenna System (DAS) for resolving a shadow area of a base station. In this case, the first optical communication device 110 may be a headend unit, and the second optical communication devices 120-1 to 120-n and/or the mux/demux 130 are extended. It may be a unit (Extension Unit) or a remote unit (Remote Unit).

As described above, the optical communication system 10 according to the technical idea of the present disclosure is applied to various WDM-based optical communication networks including optical communication devices that are remote from each other and transmit and receive optical signals through corresponding optical transceivers. It is possible.

Hereinafter, for convenience of description, on the assumption that the optical communication system 10 constitutes the fronthaul segment of the above-described radio access network architecture, the first optical communication device 110 is a terminating device on the DU side and the second optical communication device 110 is Note that the description will be focused on an embodiment in which the 2 optical communication devices 120-1 to 120-n are RUs.

The first optical communication device 110 may generate in-band optical signals for use in transmitting high-speed data input from the DU side, multiplex the generated optical signals and transmit them to the mux/demux 130 (down by link). In addition, the first optical communication device 110 may receive an optical signal transmitted through the mux/demux 130 from the second optical communication devices 120-1 to 120-n, and the received optical signal It is possible to perform predetermined signal processing on the DUs and transmit them to the DU side (uplink reference).

The first optical communication device 110 includes a main controller (MCU) 111 , a memory 113 , n first optical transceivers 1100-1 to 1100-n, and a mux/demux 115 . can do.

The MCU 111 may be configured to generally control the operation of the first optical communication device 110 . According to an embodiment, the MCU 111 is the second optical communication device 120-1 to 120-n corresponding to the n first optical transceivers 1100-1 to 1100-n described below. It is also possible to control a wavelength setting operation with respect to which wavelength an optical signal is transmitted and received with the two optical transceivers 1200-1 to 1200-n.

The memory 113 may be connected to the MCU 111 and may store various types of information and program commands necessary for the operation of the first optical communication device 110 . For example, the memory 113 may store information on wavelengths of the optical signal allocated to the first optical communication device 110 .

The first optical transceivers 1100-1 to 1100-n may be wavelength tunable optical transceivers. The first optical transceivers 1100-1 to 1100-n are connected to the second optical transceivers 1200-1 to 1200-n of the corresponding second optical communication devices 120-1 to 120-n, respectively. In order to perform communication, an automatic wavelength setting operation for setting a transmission wavelength and a reception wavelength may be performed. The first optical transceivers 1100-1 to 1100-n respectively transmit optical signals to the mux/demux 115 using wavelengths determined as a result of the automatic wavelength setting operation, or correspond to the mux/demux 115 . It is possible to receive an optical signal of a wavelength band of

The first optical transceivers 1100-1 to 1100-n may include a first controller 1110 , a first transmitter 1130 , and a first receiver 1150 , respectively. Since the functions and operations of the first optical transceivers 1100-1 to 1100-n are substantially the same, hereinafter, the first optical transceiver 1100-1 will be described as an example.

The first controller 1110 is configured to be wired or wirelessly connected to the MCU 111 , and may manage and control the first optical transceiver 1100-1.

The first controller 1110 controls (wavelength setting) necessary for smooth payload data transmission/reception between the first optical transceiver 1100-1 and a corresponding second optical transceiver, for example, the second optical transceiver 1200-1. control, etc., control of communication status monitoring, etc.) and transmission/reception of information necessary for this (hereinafter referred to as control management data) can be managed.

For example, the first controller 1110 controls the wavelength tuning necessary for wavelength setting between the first optical transceiver 1100-1 and the corresponding second optical transceiver 1200-1, transmission and reception of the tuned optical signals, It is possible to control and manage generation and transmission/reception of information related to wavelengths of transmitted and received optical signals.

Here, the first controller 1110 transmits low-speed control management data as an out-of-band optical signal through an auxiliary management and control channel together with high-speed payload data transmitted as an in-band optical signal. It may be a generic term for a processor that performs various control and processing, and/or a memory (eg, 1111 ) in which firmware is stored.

The first controller 1110 may transmit the control management data to the second optical transceiver 1200 - 1 according to various methods.

For example, the first controller 1110 may simultaneously transmit control management data and payload data to the second optical transceiver 1200 - 1 through a baseband intensity over-modulation method. As another example, the first controller 1110 may transmit the control management data and the payload data to the second optical transceiver 1200 - 1 by overlapping them through an RF pilot tone method.

The baseband intensity modulation method is a technology for stacking control management data on top of the payload data, and the RF pilot tone method is a technology for superimposing ASK or FSK-modulated control management data with the payload data. The transmission rate of the control management data may be different from the transmission rate of the payload data. For example, the frequency of the control management data may be several [kHz], and the frequency of the payload data may be several tens to hundreds [MHz]. Methods for transmitting and receiving control management data, such as a baseband intensity modulation method and an RF pilot tone method, are already publicly available technologies, and thus detailed description thereof will be omitted.

The first transmitter 1130 is configured to convert the input payload data and control management data into optical signals, respectively, and overlap them. The first transmitter 1130 may include a Transmitter Optical Sub-Assemblies (TOSA) made of a laser diode, a Laser Diode Driving circuitry (LDD), a biasing circuitry, and the like. Payload data input to the first transmitter 1130 may be input through the LDD.

The first receiver 1150 may divide the input optical signal demultiplexed by the mux/demux 115 into payload data and control management data, and output them in a corresponding configuration. In particular, the first receiver 1150 may output the control management data to the first controller 1110 . The first receiver 1150 may include a photo diode, a Receiver Optical Sub-Assemblies (ROSA) including a Trans-Impedance Amplifier (TIA), a Post Amplifier, and the like.

The mux/demux 115 may multiplex the optical signals output from the first transmitter 1130 of each of the first optical transceivers 1100-1 to 1100-n and transmit it through an optical cable, It may be a configuration for demultiplexing or demuxing optical signals received from an optical cable. According to an embodiment, the mux/demux 115 may be a separate device distinguished from the first optical communication device 110 .

The n second optical communication devices 120 - 1 to 120 - n receive optical signals transmitted from the first optical communication device 110 through the mux/demux 130 , and convert the received optical signals to photoelectricity. It can be converted and transmitted to users of the cell site after performing predetermined signal processing (downlink basis). In addition, the second optical communication devices 120 - 1 to 120 - n may electro-optically convert signals received from users to generate optical signals, and transmit the generated optical signals to the mux/demux 130 . (by uplink).

Each of the second optical communication devices 120 - 1 to 120 - n may include a corresponding optical transceiver among n second optical transceivers 1200 - 1 to 1200 - n. The second optical communication devices 120-1 to 120-n may further include components for performing the above-described signal processing in addition to the optical transceiver, and detailed descriptions thereof will be omitted for convenience of description.

The second optical transceivers 1200 - 1 to 1200 - n may include a second controller 1210 , a second transmitter 1230 , and a second receiver 1250 , respectively. Since the functions and operations of the second optical transceivers 1200 - 1 to 1200 - n are substantially the same, the second optical transceiver 1200 - 1 will be described below as an example.

The second controller 1210 may be configured to generally control the operation of the second optical transceiver 1200 - 1 .

The second controller 1210, similar to the first controller 1110 described above, is necessary for smooth payload data transmission/reception between the second optical transceiver 1200-1 and the corresponding first optical transceiver 1100-1. Control (control of wavelength setting, etc., control of communication state monitoring, etc.) and transmission/reception of information necessary for this (hereinafter referred to as control management data) can be managed.

For example, the second controller 1210 controls the wavelength tuning required for wavelength setting between the second optical transceiver 1200-1 and the corresponding first optical transceiver 1100-1, transmits and receives the tuned optical signals, It is possible to control and manage generation and transmission/reception of information related to wavelengths of transmitted and received optical signals.

Here, the second controller 1210 is configured to transmit low-speed control management data as an out-of-band optical signal through an auxiliary management and control channel together with high-speed payload data transmitted as an in-band optical signal. It may be a generic term for a processor that performs various control and processing, and/or a memory (eg, 1211 ) in which firmware is stored.

The second transmitter 1230 may have a configuration corresponding to the first transmitter 1130 , and the second receiver 1250 may have a configuration corresponding to the first receiver 1150 .

Optical signals corresponding to payload data and control management data may be generated and multiplexed through the second transmitter 1230 and the mux/demux 130 and transmitted to the first optical transceiver 1100-1. An optical signal received from the first optical transceiver 1100-1 through the mux/demux 130 and the second receiver 1250 may be demultiplexed and converted into an electrical signal.

In the above, the configuration of each of the first and second optical transceivers and the overall function of each component have been described. Hereinafter, an operation of automatically setting a wavelength between a corresponding first optical transceiver and a second optical transceiver in the optical communication system 10 will be described in detail with reference to FIGS. 3 and 4 .

3 is a diagram schematically illustrating an exemplary optical communication system to explain a method for automatically setting a wavelength of an optical transceiver according to an embodiment of the present disclosure, and FIG. 4 is a flowchart of an exemplary method for automatically setting a wavelength of an optical transceiver. FIG. 3 schematically shows the optical communication system 10 shown in FIG. 1 centered on optical transceivers and mux/demux, and FIG. 4 is the first optical transceiver 1100-1 and the second optical transceiver of FIG. 3 . It is a flowchart for explaining the operation of the automatic wavelength setting method between the transceivers 1200 - 1 .

First, referring to FIG. 3 , n first optical transceivers 1100-1 to 1100-n are connected to the mux/demux 115 , and n second optical transceivers are connected to the mux/demux 130 . (1200-1 to 1200-n) are connected, and the mux/demuxes 115 and 130 may be connected through an optical cable 141 .

The first and second optical transceivers 1100-1 to 1100-n and 1200-1 to 1200-n may be tunable optical transceivers. Accordingly, the first and second optical transceivers 1100-1 to 1100-n and 1200-1 to 1200-n may generate optical signals by changing wavelengths according to a preset method.

For example, the first optical transceivers 1100-1 to 1100-n may perform first optical transceivers 1100-1 to 1100-n according to wavelengths allocated to the first optical communication device 110 on which the first optical transceivers 1100-1 are mounted. The optical signals having the first to nth wavelengths may be generated while changing the wavelength to the first to nth wavelengths under the control of the first controller 1110 .

Similarly, the second optical transceivers 1200 - 1 to 1200 - n are configured to be configured with the second controller 1210 according to wavelengths allocated to the second optical communication devices 120 - 1 to 120 - n in which they are respectively mounted. ), while changing the wavelength to the first to nth wavelengths, optical signals having the first to nth wavelengths may be generated.

The first optical transceivers 1100-1 to 1100-n may be connected to any port of the mux/demux 115 . In FIG. 3 , the first optical transceiver 1100-1 is connected to the first port Pc1, the first optical transceiver 1100-2 is connected to the second port Pc2, and the first optical transceiver 1100 -n) is exemplified when connected to the n-th port (Pcn).

The second optical transceivers 1200 - 1 to 1200 - n may be connected to any port of the mux/demux 130 . In FIG. 3 , the second optical transceiver 1200 - 1 is connected to the first port PR1 , the second optical transceiver 1200 - 2 is connected to the second port PR2 , and the second optical transceiver 1200 is connected to the second port PR2 . -n) is connected to the n-th port PRn.

Meanwhile, the mux/demux 115 may be configured to transmit only an optical signal of a preset wavelength through an optical cable through each port. For example, the first port Pc1 may be preset to transmit only the optical signal of the first wavelength. In this case, the wavelengths preset to the second port Pc2 to the n-th port Pcn may all be different. This is also the case for the mux/demux 130 .

Accordingly, the corresponding optical transceivers among the first and second optical transceivers 1100-1 to 1100-n and 1200-1 to 1200-n connected to the mux/demux 115 and 130 are connected to the port to which they are connected. The wavelength must be set to communicate with each other using an optical signal of a wavelength that is filtered and output.

To this end, the first and second optical transceivers 1100-1 to 1100-n and 1200-1 to 1200-n according to an embodiment of the present disclosure provide an optical signal having a wavelength corresponding to an arbitrary port to which they are connected. It is possible to perform an automatic wavelength setting operation for automatically recognizing and setting the .

A wavelength automatic setting operation will be described in more detail with reference to FIG. 4 .

The steps to be described below may be steps performed in any one of the first optical transceivers 1100-1 to 1100-n and the second optical transceivers 1200-1 to 1200-n. The two optical transceivers performing the steps may be optical transceivers capable of transmitting and receiving optical signals to each other by forming an optical link connection. Hereinafter, it is assumed that the first optical transceiver 1100-1 and the second optical transceiver 1200-1 interlock with each other to form an optical link connection.

Referring to FIG. 4 , in step S410 , the first optical transceiver 1100-1 may generate first to n-th optical transmission signals having first to n-th wavelengths and output them to the multiplexer/demux 115 . have. Here, the first to n-th optical transmission signals may include transmission wavelength information regarding each wavelength (ie, a corresponding wavelength among the first to n-th wavelengths).

The first to nth wavelengths and the corresponding transmission wavelength information may be preset to perform an automatic wavelength setting operation, and the setting values may be stored in the memory 1111 of the first controller 1110 . However, the present invention is not limited thereto, and the setting values are set from the MCU 111 of the first optical communication device 110 or from an external management server (not shown), a local terminal, or the like, to the first controller 1110 through the MCU 111 . can be transmitted to

The transmission wavelength information is information on the length of a corresponding wavelength, and may be information generated as control management data by the first controller 1110 . For example, with respect to the first optical transmission signal having the first wavelength, the first controller 1110 may generate information about the length of the first wavelength as control management data.

The first transmitter 1130 sequentially generates optical signals (test optical signals) having first to n-th wavelengths, and transmits the first to n-th wavelengths respectively according to the control of the first controller 1110 . An optical signal (control management optical signal) corresponding to the wavelength information is generated, a test optical signal and a control management optical signal corresponding to each other are superimposed to generate optical transmission signals, and the generated optical transmission signals are multiplexed/demuxed (115). ) can be printed.

In step S420 , the second optical transceiver 1200 - 1 transmits the mth optical signal among the first to nth optical transmission signals through the mux/demux 115 , the optical cable 141 , and the mux/demux 130 . Only transmit signals can be received.

As described above, since each port of the mux/demux 115 performs a function of a band pass filter (BPF) to output only an optical signal of a preset wavelength, the first optical transceiver 1100-1 is connected Only one of the first to n-th optical transmission signals, for example, the mth (m is a natural number less than or equal to n) optical transmission signal, is the optical cable 141 and the mux/demux 130 by the port Pc1 may be transmitted to the second optical transceiver 1200 - 1 through .

In step S430 , the second receiver 1250 of the second optical transceiver 1200 - 1 may output m th transmission wavelength information included in the m th optical transmission signal to the second controller 1210 , and the second controller The 1210 may analyze the m-th transmission wavelength information to identify that the wavelength that the second optical transceiver 1200-1 can receive from the first optical transceiver 1100-1 is the m-th wavelength.

In step S440 , the second optical transceiver 1200 - 1 generates first to n th optical response signals having first to n th wavelengths in response to the m th optical transmission signal to generate the mux/demux 130 . can be output as Here, the first to n-th optical response signals may include transmission wavelength information regarding each wavelength (ie, a corresponding wavelength among the first to n-th wavelengths). In addition, the first to nth optical response signals may include information on the reception wavelength (eg, the mth wavelength) of the second optical transceiver 1200 - 1 identified in step S430 .

The first to nth wavelengths and the corresponding transmission wavelength information may be preset to perform an automatic wavelength setting operation, and the setting values may be stored in the memory 1211 of the second controller 1210 . However, the present invention is not limited thereto, and the setting values are transmitted through the first optical transceiver 1100-1, or the MCU 111 from the main controller (not shown) of the second optical communication device 120 or a local terminal. may be transmitted to the second controller 1210 through

The transmission wavelength information is information on the length of a corresponding wavelength, and may be information generated as control management data by the second controller 1210 . For example, with respect to the first light response signal having the first wavelength, the second controller 1210 may generate information about the length of the first wavelength as control management data.

In addition, the reception wavelength information may be information generated as control management data by the second controller 1210 as information on the length of the corresponding reception wavelength. For example, when the reception wavelength is the mth wavelength, the second controller 1210 may generate information on the length of the second wavelength as control management data.

The second transmitter 1230 sequentially generates optical signals (test response optical signals) having first to n-th wavelengths, and instructs each of the first to n-th wavelengths under the control of the second controller 1210 . Generates an optical signal (control management optical signal) corresponding to transmission wavelength information and/or reception wavelength information, superimposes a test response optical signal and a control management optical signal corresponding to each other to generate optical response signals, The response signals may be output to the mux/demux 130 .

In step S450, the first optical transceiver 1100-1 is the p-th optical signal among the first to n-th optical response signals through the mux/demux 130, the optical cable 141, and the mux/demux 115. Only response signals can be received.

Since each port of the mux/demux 130 performs a BPF function to output only an optical signal of a preset wavelength, the first to first One of the n optical response signals, for example, only the pth (p is a natural number less than or equal to n) optical response signal through the optical cable 141 and the mux/demux 115 through the first optical transceiver 1100-1 ) can be transmitted to the

In step S460, the first receiver 1150 of the first optical transceiver 1100-1 may output the p-th transmission wavelength information and the reception wavelength information included in the p-th optical response signal to the first controller 1110, , the first controller 1110 analyzes the p-th transmission wavelength information and the reception wavelength information, so that the wavelength that the first optical transceiver 1100-1 can receive from the second optical transceiver 1200-1 is the p-th wavelength It may be identified that the wavelength that the first optical transceiver 1100-1 can transmit to the second optical transceiver 1200-1 is the mth wavelength.

In step S470, the first controller 1110 includes the first optical transceiver 1100-1 and the second optical transceiver including information about the identified transmittable wavelength and receivable wavelength (ie, the m-th wavelength and the p-th wavelength). It is possible to generate optical link information between 1200 - 1 , and the first controller 1110 and the first transmitter 1130 generate an out-of-band optical signal corresponding to the generated optical link information (as control management data). generation), the mux/demux 115 , the optical cable 141 , and the mux/demux 130 may transmit to the second optical transceiver 1200 - 1 .

The second optical transceiver 1200 - 1 also analyzes an out-of-band optical signal corresponding to the optical link information and identifies the transmittable wavelength and the receivable wavelength (ie, the pth wavelength) with the first optical transceiver 1100-1. and mth wavelength) can be recognized.

In steps S480 and S490, the first and second optical transceivers 1100-1 and 1200-1 set transmit and receive wavelengths for mutual optical communication based on the identified mth and pth wavelengths, so that the wavelength setting operation is performed. After completion, in-band optical signals for high-speed payload data can be transmitted and received between the first and second optical transceivers 1100-1 and 1200-1 through set wavelengths.

By this operation, the first optical transceiver 1100-1 and the second optical transceiver 1200-1 can automatically recognize and set wavelengths that can transmit and receive each other to perform optical communication.

As described above, in the optical communication system 10 according to an embodiment of the present disclosure, the wavelength setting operation for optical communication is automatically performed by the tunable optical transceivers corresponding to each other at the transmitting side and the receiving side without an administrator's visit or direct adjustment. can be done with Accordingly, it is possible to improve the convenience of installation, maintenance and management, as well as reduce costs.

In addition, since there is no compatibility issue with the optical communication device to which the optical transceivers are applied, it has versatility, and since the tunable optical transceivers on both sides can have substantially the same components, the system construction cost can be greatly reduced.

Although the above has been described with reference to the preferred embodiment of the present disclosure, those of ordinary skill in the art can variously modify the present disclosure within the scope not 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.

10: optical communication system
110, 120: optical communication device
1100, 1200: Optical Transceiver

Claims (14)

an optical transmitter for sequentially generating a plurality of optical transmission signals each including transmission wavelength information and outputting them to a connected multiplexer/demultiplexer; and
a controller generating the transmission wavelength information for each of the plurality of optical transmission signals;
comprising, an optical transceiver.
According to claim 1,
and the optical transmitter superimposes an optical signal corresponding to the transmission wavelength information and an optical signal having a wavelength indicated by the transmission wavelength information to generate each of the plurality of optical transmission signals.
3. The method of claim 2,
The optical signal corresponding to the transmission wavelength information and the optical signal having a wavelength indicated by the transmission wavelength information are optical signals of different channels.
4. The method of claim 3,
The optical signal channel corresponding to the transmission wavelength information is an Auxiliary Management and Control Channel (AMCC), an optical transceiver.
According to claim 1,
and an optical transmission signal of any one of the plurality of optical transmission signals is transmitted to another optical transceiver through the multiplexer/demultiplexer.
6. The method of claim 5,
an optical receiver that is transmitted in response to any one optical transmission signal among the plurality of optical transmission signals from the other optical transceiver through the multiplexer/demultiplexer and receives an optical response signal including reception wavelength information and transmission wavelength information;
further comprising,
The controller identifies a transmission wavelength and a reception wavelength for communication with the other optical transceiver based on the reception wavelength information and the transmission wavelength information included in the optical response signal.
7. The method of claim 6,
The controller generates link information with the other optical transceiver based on the identified transmission wavelength and the reception wavelength;
The optical transmitter generates an optical signal corresponding to the link information and outputs it to the multiplexer/demultiplexer.
an optical receiver which is transmitted from another optical transceiver and receives an optical transmission signal including transmission wavelength information through the connected multiplexer/demultiplexer; and
a controller for identifying a reception wavelength for communication with the other optical transceiver based on the transmission wavelength information included in the optical transmission signal;
comprising, an optical transceiver.
9. The method of claim 8,
an optical transmitter for sequentially generating a plurality of optical response signals each including transmission wavelength information and reception wavelength information about the identified reception wavelength in response to the optical transmission signal and outputting the plurality of optical response signals to the multiplexer/demultiplexer;
further comprising,
The controller is configured to generate the transmission wavelength information and the reception wavelength information for each of the plurality of optical response signals.
10. The method of claim 9,
and the optical transmitter superimposes an optical signal corresponding to the transmission wavelength information and the reception wavelength information and an optical signal having a wavelength indicated by the transmission wavelength information to generate each of the plurality of optical response signals.
11. The method of claim 10,
The optical signal corresponding to the transmission wavelength information and the reception wavelength information and the optical signal having a wavelength indicated by the transmission wavelength information are optical signals of different channels.
12. The method of claim 11,
and the channel of the optical signal corresponding to the transmission wavelength information and the reception wavelength information is AMCC.
10. The method of claim 9,
and an optical response signal of any one of the plurality of optical response signals is transmitted to the other optical transceiver through the multiplexer/demultiplexer.
14. The method of claim 13,
the optical receiver receives an optical signal transmitted in response to any one of the plurality of optical response signals from the other optical transceiver through the multiplexer/demultiplexer and corresponding to optical link information;
and the controller identifies a transmission wavelength for communication with the other optical transceiver based on the link information included in the optical signal.

Images