Optical transceiver and method for automatically setting wavelength thereof

Abstract

To provide an optical transceiver and a method of automatically setting a wavelength thereof.SOLUTION: An optical transceiver includes: an optical transmitter configured to sequentially generate a plurality of optical transmission signals each including transmission wavelength information and output the signals to a connected multiplexer / demultiplexer; and a controller configured to generate the transmission wavelength information for each of the optical transmission signals.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an optical transceiver and an automatic wavelength setting method thereof. [Background technology]

[0002] Wavelength-division multiplexing (WDM) is a technology that allows multiple optical signals to be transmitted simultaneously over the same optical fiber, which is achieved by having each optical signal have a different wavelength. At the transmit side of a WDM-based optical communication system, multiple signals of different wavelengths are transmitted over the same optical fiber. At the receive side of a WDM-based optical communication system, the wavelengths are often separated. The advantage of a WDM system is that it allows a single optical fiber to carry multiple optical signals with different carrier wavelengths, effectively providing a virtual optical fiber.

[0003] In general, the optical communication devices on the transmitting and receiving sides of a WDM-based optical communication system are located at distances of several to several tens of kilometers from each other. P Lexa / Demal P The optical transceivers are connected to the lexer through an optical cable to transmit and receive optical signals between remote locations. For this type of optical communication, an optical link must be formed by setting the wavelengths for transmission and reception of the corresponding optical transceivers on both sides. However, it is very troublesome and time-consuming for an administrator to visit the installation site of the optical communication device and set the wavelengths of the optical transceivers. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Korean Patent Publication No. 10-2016-0043655 Summary of the Invention [Problem to be solved by the invention]

[0005] An object of the present invention is to provide an optical transceiver that can automatically set a wavelength without the visit of an administrator, and a method for automatically setting the wavelength.

[0006] The technical problems to be solved by the technical idea of ​​the present invention are not limited to the problems mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the following description. [Means for solving the problem]

[0007] According to one aspect of the present invention, a plurality of optical transmission signals each including transmission wavelength information are sequentially generated, and a multi-transmission device is connected to the optical transmission signal. P Lexer / Demultiplexer To An optical transceiver is disclosed that includes an optical transmitter having an output and a controller that generates the transmission wavelength information for each of the plurality of optical transmit signals.

[0008] According to an exemplary embodiment, the optical transmitter generates 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.

[0009] 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 are optical signals of different channels.

[0010] According to an exemplary embodiment, the channel of the optical signal corresponding to the transmission wavelength information is an Auxiliary Management and Control Channel (AMCC).

[0011] According to an exemplary embodiment, any one of the plurality of optical transmission signals is the multi P Lexer / Demultiplexer Sa The signal is then transmitted to other optical transceivers via the optical fiber.

[0012] According to an exemplary embodiment, the multi P Lexer / Demultiplexer Sa The optical transceiver further includes an optical receiver that receives an optical response signal transmitted from the other optical transceiver in response to any one of the plurality of optical transmission signals and including reception wavelength information and transmission wavelength information, and 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.

[0013] According to an exemplary embodiment, the controller generates link information with the other optical transceiver based on the identified transmission wavelength and the reception wavelength, and the optical transmitter generates an optical signal corresponding to the link information to link the multi-mode optical signal with the other optical transceiver. P Lexer / Demultiplexer To Output.

[0014] According to another aspect of the present invention, a multi- P Lexer / Demultiplexer Sa An optical transceiver is disclosed that includes an optical receiver that receives an optical transmission signal transmitted from another optical transceiver and including transmission wavelength information, and a controller that identifies a receiving wavelength for communication with the other optical transceiver based on the transmission wavelength information included in the optical transmission signal.

[0015] According to an exemplary embodiment, in response to the optical transmission signal, a plurality of optical response signals are sequentially generated, each of the optical response signals including transmission wavelength information and reception wavelength information for the identified reception wavelengths, to obtain the multi-mode signal. P Lexer / Demultiplexer To The optical transmitter further includes an optical transmitter outputting the optical response signals, and the controller generates the transmit wavelength information and the receive wavelength information for each of the plurality of optical response signals.

[0016] According to an exemplary embodiment, the optical transmitter generates each of the multiple optical response signals by superimposing an optical signal corresponding to the transmitting wavelength information and the receiving wavelength information and an optical signal having a wavelength indicated by the transmitting wavelength information.

[0017] 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 are optical signals of different channels.

[0018] According to an exemplary embodiment, the channel of the optical signal corresponding to the transmit wavelength information and the receive wavelength information is AMCC.

[0019] According to an exemplary embodiment, any one of the plurality of optical response signals is P Lexer / Demultiplexer Sa The signal is transmitted to the other optical transceiver via the optical transceiver.

[0020] According to an exemplary embodiment, the optical receiver includes: P Through the lexer / demultiplexer, an optical signal corresponding to optical link information transmitted from the other optical transceiver in response to any one of the plurality of optical response signals is received, and the controller identifies a transmission wavelength for communication with the other optical transceiver based on the link information contained in the optical signal. Effect of the Invention

[0021] According to an embodiment of the present invention, the wavelength of the corresponding optical transceiver is automatically set without an administrator's visit, thereby improving convenience and reducing wavelength-related installation and maintenance costs.

[0022] Furthermore, there is no compatibility issue with the optical communication device in which the optical transceiver is implemented, and optical transceivers made up of the same components can be used at both ends of the link, reducing system construction costs.

[0023] The effects obtained by the embodiments according to the technical concept of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the following description. [Brief description of the drawings]

[0024] [Figure 1] 1 is a schematic diagram of an optical communication system according to an embodiment of the present invention; [Diagram 2] 2 is a block diagram showing in more detail a main part of an optical transceiver in the optical communication system according to an embodiment of the present invention; FIG. [Diagram 3] 1 is a diagram illustrating an exemplary optical communication system for explaining a method for automatically setting a wavelength of an optical transceiver according to an embodiment of the present invention; [Figure 4] 4 is a flowchart of an exemplary method for automatically configuring a wavelength of an optical transceiver. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0025] The technical idea of ​​the present invention can be modified in various ways and can have various embodiments, and therefore, specific embodiments are illustrated in the drawings and will be described in detail. However, this is not intended to limit the technical idea of ​​the present invention to the specific embodiments, and it should be understood that the technical idea of ​​the present invention includes all modifications, equivalents, and alternatives included in the scope of the technical idea of ​​the present invention.

[0026] In describing the technical concept of the present invention, if a detailed description of the related known art is deemed to unnecessarily obscure the gist of the present invention, the detailed description will be omitted. In addition, numbers (e.g., 1, 2, etc.) used in the description of this specification are merely identification symbols for distinguishing one component from another.

[0027] In addition, when a component is referred to as being "coupled" or "connected" to another component in this specification, it should be understood that the component may be directly coupled or connected to the other component, but unless specifically stated to the contrary, it may also be coupled or connected via another component in between.

[0028] In addition, terms such as "module", "device" and "child" used in this specification refer to a unit that processes at least one function or operation, and this is embodied as hardware or software, or a combination of hardware and software, such as a processor, microprocessor, microcontroller, CPU (Central Processing Unit), GPU (Graphics Processing Unit), APU (Accelerate Processor Unit), DSP (Drive Signal Processor), ASIC (Application Specific Integrated Circuit) or FPGA (Field Programmable Gate Array).

[0029] It is to be noted that the components in this specification are merely classified according to the main function of each component. That is, two or more components described below may be combined into one component, or one component may be divided into two or more components according to further subdivided functions. It goes without saying that each component described below may perform some or all of the functions of other components in addition to its own main function, and some of the main functions of each component may be exclusively performed by other components.

[0030] Hereinafter, various embodiments according to the technical concept of the present invention will be described in detail.

[0031] FIG. 1 is a schematic diagram of an optical communication system according to an embodiment of the present invention, and FIG. 2 is a block diagram showing in more detail the main part of an optical transceiver in the optical communication system according to an embodiment of the present invention.

[0032] Referring to FIG. 1, an optical communication system 10 according to an embodiment of the present invention includes a first optical communication device 110 including n (n is a natural number equal to or greater than 2) first optical transceivers 1100-1 through 1100-n, second optical communication devices 120-1 through 120-n each including at least one second optical transceiver, and a multi-mode optical communication device 120. P and a lexer / demultiplexer 130 (hereinafter referred to as MUX / DEMUX). The first optical communication device 110 and the MUX / DEMUX 130 are connected via an optical cable 141, and the second optical communication devices 120-1 to 120-n and the MUX / DEMUX 130 are connected via corresponding optical cables among the optical cables 143-1 to 143-n. Depending on the embodiment, a tree topology may be formed by connecting a plurality of sub-MUX / DEMUXs to the MUX / DEMUX 130 and connecting the second optical communication devices 120-1 to 120-n to the sub-MUXs.

[0033] In some embodiments, the optical communication system 10 constitutes an optical transmission network, which is a serving network constituting a fronthaul segment of a radio access network architecture. In this case, the first optical communication device 110 is a longitudinal device on the side of a digital unit (DU) or a baseband unit (BBU) on the central office side. The second optical communication devices 120-1 to 120-n are remote units (RU) or remote radio heads (RRH). 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. However, the present invention is not limited thereto, and the technical idea of ​​the present invention may also be applied to a midhaul and backhaul segment of the radio access network architecture.

[0034] In another embodiment, the optical communication system 10 is applied to an optical subscriber network. In this case, the first optical communication device 110 is an optical line terminal (OLT) at the central office. The second optical communication devices 120-1 to 120-n are any one of a remote terminal (RT), an optical network terminal (ONT) at the subscriber side, and an optical network unit. 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.

[0035] In yet another embodiment, the optical communication system 10 is applied to a distributed antenna system (DAS) for eliminating shadow areas of a base station, in which the first optical communication device 110 is a headend unit, and the second optical communication devices 120-1 to 120-n and / or the MUX / DEMUX 130 are extension units or remote units.

[0036] As described above, the optical communication system 10 according to the technical concept of the present invention can be applied to various WDM-based optical communication networks implemented by optical communication devices located at remote locations and transmitting and receiving optical signals through corresponding optical transceivers.

[0037] For ease of explanation, the following description will focus on an embodiment in which the first optical communication device 110 is a longitudinal device on the DU side and the second optical communication devices 120-1 to 120-n are RUs, assuming that the optical communication system 10 constitutes a fronthaul segment of the radio access network architecture described above.

[0038] The first optical communication device 110 generates optical signals within a band to be used when transmitting high-speed data input from the DU side, multiplexes the generated optical signals, and transmits them to the MUX / DEMUX 130 (downlink basis). The first optical communication device 110 also receives optical signals transmitted from the second optical communication devices 120-1 to 120-n through the MUX / DEMUX 130, performs predetermined signal processing on the received optical signals, and transmits them to the DU side (uplink basis).

[0039] 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 .

[0040] The MCU 111 is configured to generally control the operation of the first optical communication device 110. Depending on the embodiment, the MCU 111 may control a wavelength setting operation regarding at what wavelength the n first optical transceivers 1100-1 to 1100-n described below transmit and receive optical signals with the corresponding second optical transceivers 1200-1 to 1200-n of the second optical communication devices 120-1 to 120-n.

[0041] The memory 113 is connected to the MCU 111 and stores various information and program commands required for the operation of the first optical communication device 110. For example, the memory 113 stores information regarding the wavelength of an optical signal assigned to the first optical communication device 110.

[0042] The first optical transceivers 1100-1 to 1100-n are wavelength-tunable optical transceivers. The first optical transceivers 1100-1 to 1100-n perform an automatic wavelength setting operation to set a transmission wavelength and a reception wavelength in order to perform optical communication with the second optical transceivers 1200-1 to 1200-n of the corresponding second optical communication devices 120-1 to 120-n, respectively. The first optical transceivers 1100-1 to 1100-n transmit optical signals to the MUX / DEMUX 115 or receive optical signals in the corresponding wavelength bands from the MUX / DEMUX 115 using the wavelengths determined as a result of the automatic wavelength setting operation.

[0043] Each of the first optical transceivers 1100-1 to 1100-n includes a first controller 1110, a first transmitter 1130, and a first receiver 1150. The functions and operations of the first optical transceivers 1100-1 to 1100-n are substantially equal to each other, so the following description will be given by taking the first optical transceiver 1100-1 as an example.

[0044] The first controller 1110 is connected to the MCU 111 via wired or wireless communication, and manages and controls the first optical transceiver 1100-1.

[0045] The first controller 1110 manages the control required for smooth transmission and reception of payload data between the first optical transceiver 1100-1 and a corresponding second optical transceiver, for example, the second optical transceiver 1200-1 (control such as wavelength setting, control such as communication status monitoring), and the transmission and reception of information required for this (hereinafter referred to as control management data).

[0046] For example, the first controller 1110 controls and manages the wavelength tuning required for setting the wavelength between the first optical transceiver 1100-1 and the corresponding second optical transceiver 1200-1, the transmission and reception of tuned optical signals, and the generation, transmission and reception of information regarding the wavelengths of the optical signals being transmitted and received.

[0047] Here, the first controller 1110 is a general term for a processor that performs various controls and processing to transmit low-speed control and management data as an out-of-band optical signal through an Auxiliary Management and Control Channel along with high-speed payload data transmitted as an in-band optical signal, and / or a memory (e.g., 1111) in which firmware, etc. are stored.

[0048] The first controller 1110 transmits the control management data to the second optical transceiver 1200-1 in various ways.

[0049] For example, the first controller 1110 uses a baseband intensity modulation scheme to simultaneously transmit the control management data and the payload data to the second optical transceiver 1200-1. For example, the first controller 1110 uses a radio frequency pilot tone scheme to superimpose the control management data and the payload data and transmits them to the second optical transceiver 1200-1.

[0050] The baseband intensity modulation method is a technology that stacks control management data on top of payload data, and the RF pilot ton method is a technology that overlaps ASK or FSK modulated control management data with payload data. The transmission speed of the control management data is different from the transmission speed of the payload data. For example, the frequency of the control management data is several kHz, while the frequency of the payload data is several tens to several hundreds of MHz. The transmission and reception methods of control management data, such as the baseband intensity modulation method and the RF pilot ton method, are already publicly known technologies, so the specific details will be omitted.

[0051] The first transmitter 1130 converts the input payload data and control management data into optical signals and superimposes them. The first transmitter 1130 includes a Transmitter Optical Sub-Assemblies (TOSA) consisting of a laser diode, a laser diode driving circuit (LDD), a biasing circuit, etc. The payload data input to the first transmitter 1130 is input via the LDD.

[0052] The first receiver 1150 separates the optical signal demultiplexed and input by the MUX / DEMUX 115 into payload data and control management data, and outputs them in the corresponding configurations. In particular, the first receiver 1150 outputs the control management data to the first controller 1110. The first receiver 1150 includes a photodiode, ROSA (Receiver Optical Sub-Assemblies) consisting of a TIA (Trans-Impedance Amplifier), a post amplifier, etc.

[0053] The MUX / DEMUX 115 multiplexes optical signals output from the first transmitters 1130 of the first optical transceivers 1100-1 to 1100-n, transmits the multiplexed optical signals to an optical cable, and demultiplexes optical signals received through the optical cable. Depending on the embodiment, the MUX / DEMUX 115 may be a separate device distinct from the first optical communication device 110.

[0054] 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, perform opto-electrical conversion on the received optical signals, perform predetermined signal processing, and transmit the signals to users at the cell sites (downlink basis).The second optical communication devices 120-1 to 120-n perform electric-to-optical conversion on the signals received from the users to generate optical signals, and transmit the generated optical signals to the MUX / DEMUX 130 (uplink basis).

[0055] Each of the second optical communication devices 120-1 to 120-n includes a corresponding one of the n second optical transceivers 1200-1 to 1200-n. In addition to the optical transceivers, the second optical communication devices 120-1 to 120-n further include components for performing the above-mentioned signal processing, and detailed description thereof will be omitted for convenience of explanation.

[0056] Each of the second optical transceivers 1200-1 to 1200-n includes a second controller 1210, a second transmitter 1230, and a second receiver 1250. The functions and operations of the second optical transceivers 1200-1 to 1200-n are substantially equal to each other, so the following description will be given by taking the second optical transceiver 1200-1 as an example.

[0057] The second controller 1210 is configured to generally control the operation of the second optical transceiver 1200-1.

[0058] The second controller 1210, similar to the first controller 1110 described above, manages the control required for smooth transmission and reception of payload data between the second optical transceiver 1200-1 and its corresponding first optical transceiver 1100-1 (control such as wavelength setting, control such as communication status monitoring, etc.), as well as the transmission and reception of information required for this (hereinafter referred to as control management data).

[0059] For example, the second controller 1210 controls and manages the wavelength tuning required for setting the wavelength between the second optical transceiver 1200-1 and the corresponding first optical transceiver 1100-1, the transmission and reception of tuned optical signals, and the generation, transmission and reception of information regarding the wavelengths of the optical signals being transmitted and received.

[0060] Here, the second controller 1210 is a general term for a processor that performs various controls and processes to transmit low-speed control and management data as an out-of-band optical signal through an Auxiliary Management and Control Channel (AMCC) along with high-speed payload data transmitted as an in-band optical signal, and / or a memory (e.g., 1211) in which firmware, etc. are stored.

[0061] The second transmitter 1230 has a configuration corresponding to the first transmitter 1130, and the second receiver 1250 has a configuration corresponding to the first receiver 1150.

[0062] Through the second transmitter 1230 and the MUX / DEMUX 130, optical signals corresponding to payload data and control management data are generated and multiplexed and transmitted to the first optical transceiver 1100-1. Through the MUX / DEMUX 130 and the second receiver 1250, optical signals received from the first optical transceiver 1100-1 are demultiplexed and converted into electrical signals.

[0063] The configurations of the first and second optical transceivers and the general functions of the respective components have been described above. In the following, the automatic wavelength setting operation between the corresponding first and second optical transceivers in the optical communication system 10 will be specifically described with reference to Figs. 3 and 4.

[0064] Fig. 3 is a diagram illustrating an example of an optical communication system for explaining a method for automatically setting a wavelength of an optical transceiver according to an embodiment of the present invention, and Fig. 4 is a flowchart of an example of the method for automatically setting a wavelength of an optical transceiver. Fig. 3 illustrates the optical communication system 10 illustrated in Fig. 1, focusing on the optical transceiver and MUX / DEMUX, and Fig. 4 is a flowchart for explaining the operation of the method for automatically setting a wavelength between the first optical transceiver 1100-1 and the second optical transceiver 1200-1 in Fig. 3.

[0065] First, referring to FIG. 3, n first optical transceivers 1100-1 to 1100-n are connected to the MUX / DEMUX 115, n second optical transceivers 1200-1 to 1200-n are connected to the MUX / DEMUX 130, and the MUX / DEMUX 115 and 130 are connected via an optical cable 141.

[0066] The first and second optical transceivers 1100-1 to 1100-n and 1200-1 to 1200-n are wavelength-tunable optical transceivers, and therefore, the first and second optical transceivers 1100-1 to 1100-n and 1200-1 to 1200-n generate optical signals by changing the wavelength in a predetermined manner.

[0067] For example, the first optical transceivers 1100-1 to 1100-n generate optical signals having first to nth wavelengths while changing the wavelength to the first to nth wavelengths under the control of the first controller 1110 depending on the wavelength assigned to the first optical communication device 110 in which the first optical transceivers 1100-1 to 1100-n are implemented.

[0068] Similarly, the second optical transceivers 1200-1 to 1200-n generate optical signals having the first to nth wavelengths while changing the wavelength to the first to nth wavelengths under the control of the second controller 1210 depending on the wavelengths assigned to the second optical communication devices 120-1 to 120-n in which they are implemented.

[0069] The first optical transceivers 1100-1 to 1100-n are 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 connected to the n-th port Pcn.

[0070] The second optical transceivers 1200-1 to 1200-n are 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-n is connected to the n-th port PRn.

[0071] Meanwhile, the MUX / DEMUX 115 is set so that only optical signals of a predetermined wavelength are transmitted through each port via the optical cable. For example, the first port Pc1 is preset so as to transmit only optical signals of the first wavelength. At this time, the wavelengths preset for the second port Pc2 through the n-th port Pcn are all different. The same is true for the MUX / DEMUX 130.

[0072] Therefore, among the first and second optical transceivers 1100-1 to 1100-n and 1200-1 to 1200-n connected to the MUX / DEMUXs 115 and 130, corresponding optical transceivers must set wavelengths to communicate with each other using optical signals of wavelengths that are filtered and output at the ports to which they are connected.

[0073] To this end, the first and second optical transceivers 1100-1 to 1100-n and 1200-1 to 1200-n according to one embodiment of the present invention perform an automatic wavelength setting operation to automatically recognize and set an optical signal of a wavelength corresponding to any port to which they are connected.

[0074] The automatic wavelength setting operation will now be described in further detail with reference to FIG.

[0075] The steps described below are performed by one of the first optical transceivers 1100-1 to 1100-n and one of the second optical transceivers 1200-1 to 1200-n. The two optical transceivers performing the above steps are optical transceivers that form an optical link connection and can transmit and receive optical signals to and from each other. The following description assumes that the first optical transceiver 1100-1 and the second optical transceiver 1200-1 cooperate with each other to form an optical link connection.

[0076] 4, in step S410, the first optical transceiver 1100-1 generates first through n-th optical transmission signals having first through n-th wavelengths and outputs them to the MUX / DEMUX 115. Here, the first through n-th optical transmission signals include transmission wavelength information regarding each wavelength (in other words, a corresponding wavelength among the first through n-th wavelengths).

[0077] The first through n-th wavelengths and corresponding transmission wavelength information are preset to perform an automatic wavelength setting operation, and the setting values ​​are stored in the memory 1111 of the first controller 1110. However, the present invention is not limited to this, and the setting values ​​are transmitted to the first controller 1110 through the MCU 111 from the MCU 111 of the first optical communication device 110, or from an external management server (not shown) and a local terminal, etc.

[0078] The transmission wavelength information is information about the length of a corresponding wavelength, and is generated as control management data by the first controller 1110. For example, for a first optical transmission signal having a first wavelength, the first controller 1110 generates information about the length of the first wavelength as control management data.

[0079] The first transmitter 1130 sequentially generates optical signals (test optical signals) having first through nth wavelengths, and under the control of the first controller 1110, generates optical signals (control management optical signals) corresponding to transmission wavelength information indicating each of the first through nth wavelengths, generates an optical transmission signal by superimposing the corresponding test optical signals and control management optical signals, and outputs the generated optical transmission signal to the MUX / DEMUX 115.

[0080] In step S420, the second optical transceiver 1200-1 receives only the m-th optical transmission signal among the first through n-th optical transmission signals through the MUX / DEMUX 115, the optical cable 141, and the MUX / DEMUX .

[0081] As described above, each port of MUX / DEMUX 115 functions as a BPF (Band Pass Filter) to output only optical signals of a preset wavelength, so that only one of the first through n-th optical transmission signals, for example, the m-th (m is a natural number less than or equal to n) optical transmission signal, is transmitted to the second optical transceiver 1200-1 side via the optical cable 141 and MUX / DEMUX 130 by the port Pc1 to which the first optical transceiver 1100-1 is connected.

[0082] In step S430, the second receiver 1250 of the second optical transceiver 1200-1 outputs the mth transmission wavelength information contained in the mth optical transmission signal to the second controller 1210, and the second controller 1210 analyzes the mth transmission wavelength information and identifies that the wavelength that the second optical transceiver 1200-1 can receive from the first optical transceiver 1100-1 is the mth wavelength.

[0083] In step S440, the second optical transceiver 1200-1 generates first through n-th optical response signals having first through n-th wavelengths in response to the m-th optical transmission signal, and outputs the first through n-th optical response signals to the MUX / DEMUX 130. Here, the first through n-th optical response signals include transmission wavelength information regarding each wavelength (in other words, a corresponding wavelength among the first through n-th wavelengths) and also include information regarding the reception wavelength (e.g., the m-th wavelength) of the second optical transceiver 1200-1 identified in step S430.

[0084] The first through n-th wavelengths and the corresponding transmission wavelength information are preset to perform an automatic wavelength setting operation, and the setting values ​​are stored in the memory 1211 of the second controller 1210. However, the present invention is not limited to this, and the setting values ​​are transmitted through the first optical transceiver 1100-1, or transmitted to the second controller 1210 through the MCU 111 from a main controller (not shown) or a local terminal of the second optical communication device 120.

[0085] The transmission wavelength information is information about the length of a corresponding wavelength, and is generated as control management data by the second controller 1210. For example, for a first optical response signal having a first wavelength, the second controller 1210 generates information about the length of the first wavelength as control management data.

[0086] Furthermore, the receiving wavelength information is information about the length of a corresponding receiving wavelength, and is information generated as control management data by the second controller 1210. For example, when the receiving wavelength is the m-th wavelength, the second controller 1210 generates information about the length of the second wavelength as control management data.

[0087] The second transmitter 1230 sequentially generates optical signals (test response optical signals) having the first through nth wavelengths, and under the control of the second controller 1210, generates optical signals (control management optical signals) corresponding to transmitting wavelength information and / or receiving wavelength information indicating each of the first through nth wavelengths, generates an optical response signal by superimposing the corresponding test response optical signal and control management optical signal, and outputs the generated optical response signal to the MUX / DEMUX 130.

[0088] In step S450, the first optical transceiver 1100-1 receives only the p-th optical response signal from among the first through n-th optical response signals through the MUX / DEMUX 130, the optical cable 141, and the MUX / DEMUX 115.

[0089] Since each port of MUX / DEMUX 130 functions as a BPF to output only optical signals of a preset wavelength, only one of the first to nth optical response signals, for example, the pth (p is a natural number less than n) optical response signal, is transmitted to the first optical transceiver 1100-1 side via the optical cable 141 and MUX / DEMUX 115 by the first port PR1 to which the second optical transceiver 1200-1 is connected.

[0090] In step S460, the first receiver 1150 of the first optical transceiver 1100-1 outputs the pth transmitting wavelength information and receiving wavelength information contained in the pth optical response signal to the first controller 1110, and the first controller 1110 analyzes the pth transmitting wavelength information and receiving wavelength information to identify that the wavelength that the first optical transceiver 1100-1 can receive from the second optical transceiver 1200-1 is the pth wavelength, and that the wavelength that the first optical transceiver 1100-1 can transmit to the second optical transceiver 1200-1 is the mth wavelength.

[0091] In step S470, the first controller 1110 generates optical link information between the first optical transceiver 1100-1 and the second optical transceiver 1200-1, including information regarding the identified transmittable wavelengths and receiveable wavelengths (i.e., the mth wavelength and the pth wavelength), and the first controller 1110 and the first transmitter 1130 generate an out-of-band optical signal corresponding to the generated optical link information (generated as control management data) and transmit it to the second optical transceiver 1200-1 via the MUX / DEMUX 115, the optical cable 141, and the MUX / DEMUX 130.

[0092] The second optical transceiver 1200-1 also analyzes the out-of-band optical signal corresponding to the optical link information to recognize the identified transmittable and receiveable wavelengths (i.e., the pth wavelength and the mth wavelength) between it and the first optical transceiver 1100-1.

[0093] In steps S480 and S490, the first and second optical transceivers 1100-1 and 1200-1 set the transmit and receive wavelengths for each other's optical communication based on the identified mth and pth wavelengths, thereby completing the wavelength setting operation, and the first and second optical transceivers 1100-1 and 1200-1 transmit and receive in-band optical signals for high-speed payload data through the set wavelengths.

[0094] Through such operations, the first optical transceiver 1100-1 and the second optical transceiver 1200-1 automatically recognize and set the wavelengths that can be transmitted and received from each other, and perform optical communication.

[0095] As described above, in the optical communication system 10 according to the embodiment of the present invention, the wavelength-tunable optical transceivers on the transmitting side and the receiving side automatically set the wavelength for optical communication without the need for a manager to visit and make adjustments. This not only improves the convenience of installation and maintenance, but also reduces costs.

[0096] Furthermore, the optical transceiver has no compatibility issues with optical communication devices to which it is applied, making it versatile, and the wavelength-tunable optical transceivers on both sides can have substantially the same components, greatly reducing the system construction costs.

[0097] Although the present invention has been described with reference to preferred embodiments thereof, those skilled in the art will understand that the present invention can be modified and changed in various ways without departing from the spirit and scope of the present invention as set forth in the following claims. [Explanation of symbols]

[0098] 10: Optical communication systems 110, 120: Optical communication device 1100, 1200: Optical transceiver

Claims

1. an optical transmitter that sequentially generates a plurality of optical transmission signals each including transmission wavelength information and outputs the optical transmission signals to a multiplexer / demultiplexer connected thereto; a controller for generating the transmission wavelength information for each of the plurality of optical transmission signals; the optical transmitter generates 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 designated by the transmission wavelength information; An optical transceiver, wherein the optical signal corresponding to the transmission wavelength information and the optical signal having a wavelength designated by the transmission wavelength information are optical signals that can be separated independently from each other.

2. 2. The optical transceiver of claim 1, wherein the channel of the optical signal corresponding to the transmission wavelength information is an Auxiliary Management and Control Channel (AMCC).

3. 2. The optical transceiver of claim 1, wherein one of the plurality of optical transmission signals is transmitted to another optical transceiver through the multiplexer / demultiplexer.

4. an optical receiver for receiving an optical response signal, the optical response signal including reception wavelength information and transmission wavelength information, transmitted from the other optical transceiver through the multiplexer / demultiplexer in response to one of the plurality of optical transmission signals; 4. The optical transceiver of claim 3, wherein the controller identifies a transmitting wavelength and a receiving wavelength for communication with the other optical transceiver based on the receiving wavelength information and the transmitting wavelength information included in the optical response signal.

5. the controller generates link information with the other optical transceiver based on the identified transmitting wavelength and the identified receiving wavelength; the optical transmitter generates an optical signal corresponding to the link information and outputs the optical signal to the multiplexer / demultiplexer; 5. The optical transceiver of claim 4, wherein the link information comprises information regarding identified transmit and receive wavelengths.

6. an optical receiver for receiving an optical transmission signal including transmission wavelength information transmitted from another optical transceiver through a multiplexer / demultiplexer connected thereto; a controller that identifies a receiving wavelength for communication with the other optical transceiver based on the transmission wavelength information included in the optical transmission signal; the optical transmission signal is a signal in which an optical signal corresponding to the transmission wavelength information and an optical signal having a wavelength designated by the transmission wavelength information are superimposed, an optical signal corresponding to said transmission wavelength information and an optical signal having a wavelength designated by said transmission wavelength information, said optical signal being separable independently from each other;

7. an optical transmitter that, in response to the optical transmission signal, sequentially generates a plurality of optical response signals each including transmission wavelength information and reception wavelength information related to the identified reception wavelength, and outputs the optical response signals to the multiplexer / demultiplexer; 7. The optical transceiver of claim 6, wherein the controller generates the transmit wavelength information and the receive wavelength information for each of the plurality of optical response signals.

8. The optical transceiver of claim 7, wherein the optical transmitter generates each of the plurality of optical response signals by superimposing an optical signal corresponding to the transmitting wavelength information and the receiving wavelength information and an optical signal having a wavelength indicated by the transmitting wavelength information.

9. 9. The optical transceiver according to claim 8, wherein the optical signal corresponding to the transmission wavelength information and the reception wavelength information and the optical signal having a wavelength designated by the transmission wavelength information are optical signals of different channels.

10. 10. The optical transceiver of claim 9, wherein the channel of the optical signal corresponding to the transmitting wavelength information and the receiving wavelength information is an Auxiliary Management and Control Channel (AMCC).

11. 8. The optical transceiver of claim 7, wherein one of the plurality of optical response signals is transmitted to the other optical transceiver through the multiplexer / demultiplexer.

12. the optical receiver receives an optical signal corresponding to link information transmitted in response to one of the optical response signals from the other optical transceiver through the multiplexer / demultiplexer; the controller identifies a transmission wavelength for communication with the other optical transceiver based on the link information included in the optical signal; The optical transceiver of claim 11, wherein the link information comprises information regarding identified transmit and receive wavelengths.

Images