Signal transmission method in wavelength division multiplexing optical transmission environment and optical transceiver supporting same

Abstract

An embodiment of the present invention discloses a method for transmitting a signal in a wavelength division multiplexing optical transmission environment and an optical transceiver supporting same. The method comprises the steps of: determining an abnormal state, by a control circuit of an optical transceiver outputting an optical signal of a first wavelength to a transmission line; generating a random number when the abnormal state is determined; selecting a slot corresponding to the random number within a predetermined period divided into a plurality of slots; and writing unique identification information in the selected slot and transmitting same.

Description

Signal transmission method in a wavelength multiplexing optical transmission environment and an optical transceiver supporting the same

[0001] The present invention relates to the operation of an optical transceiver for efficient wired network maintenance and repair.

[0002] Optical multiplexing devices are arranged between a plurality of digital signaling units (DU) and a plurality of radio base station units (RU), and the optical multiplexing devices can be connected by a single optical fiber line. For example, a plurality of digital signaling units and a plurality of radio base station units each include an optical transceiver, and the optical transceivers installed in each digital signaling unit and each radio base station unit can be connected through an optical multiplexing device (or a wavelength separation optical filter, or a wavelength separation unit) that supports a wavelength multiplexing method. For example, a first wavelength separation unit (e.g., a Wavelength Division Multiplexing Filter, WDM Filter) connected to optical transceivers deployed in multiple digital signal devices may be connected via an optical fiber line to a second wavelength separation unit connected to optical transceivers deployed in multiple wireless base stations. Here, the optical fiber transmission line may be a single line or multiple lines, and multiple optical fiber lines may be laid in a bundle form within an enclosure. To increase the efficiency of the optical line (or optical channel) in the transmission of optical signals between optical transceivers through such transmission lines, a wavelength division multiplexing transmission method is used.

[0003] In the aforementioned optical transmission environment, if an abnormality occurs in the transmission line, it may be necessary to verify the optical line during the transmission line restoration process.

[0004] Accordingly, the present invention provides a signal transmission method in a wavelength multiplex optical transmission environment capable of transmitting designated unique identification information based on a slot method, and an optical transceiver supporting the same.

[0005] However, the objectives of the present invention are not limited to the above objectives, and other unmentioned objectives will be clearly understood from the description below.

[0006] An optical transceiver supporting wavelength multiplex optical transmission for achieving the purpose described above comprises a transmitting circuit that outputs an optical signal of a first wavelength among a plurality of different wavelengths to a transmission line, a receiving circuit that receives an optical signal transmitted by a counterpart device, and a control circuit that controls the receiving circuit and the transmitting circuit. The control circuit is characterized by generating a random number when determined to be in an abnormal state, selecting a slot corresponding to the random number within a certain period divided into a plurality of slots, and controlling the transmission by writing a first unique identification information into the selected slot.

[0007] Specifically, the control circuit may be configured to determine the abnormal state if the intensity of the optical signal received through the receiving circuit is below a preset level.

[0008] Specifically, the control circuit can control the generation of a new random number at each period while the abnormal state is maintained, and the transmission of the first unique identification information by writing it into the slot corresponding to the newly generated random number.

[0009] Specifically, the control circuit can determine a normal state when the intensity of the optical signal received through the receiving circuit is above a preset level, stop the random number generation according to the normal state determination, and control the output of the data received from the host device by converting it into an optical signal of the first wavelength.

[0010] A signal transmission method in a wavelength multiplex optical transmission environment according to an embodiment of the present invention is characterized in that a control circuit of an optical transceiver that outputs an optical signal of a first wavelength to a transmission line comprises: a step of determining an abnormal state; a step of generating a random number when the abnormal state is determined; a step of selecting a slot corresponding to the random number within a certain period divided into a plurality of slots; and a step of writing unique identification information to the selected slot and transmitting it.

[0011] Specifically, the step of determining the abnormal state may include checking whether the intensity of the optical signal received through the receiving circuit of the optical transceiver is below a preset level, and determining the abnormal state if the intensity of the received optical signal is below the preset level.

[0012] Specifically, the step of generating the random number includes the step of generating a new random number every cycle while the abnormal state is maintained, and the step of transmitting may include the step of transmitting by writing the unique identification information into the slot corresponding to the new random number.

[0013] Specifically, the method may further include the steps of: determining a normal state when the intensity of the optical signal received through the receiving circuit is above a preset level; stopping the generation of the random number and receiving data from the host device in accordance with the determination of the normal state; and converting the data received from the host device into an optical signal of the first wavelength and outputting it.

[0014] Specifically, the number of the plurality of slots can be set to be greater than the number of the plurality of optical transceivers that transmit unique identification information through the transmission line.

[0015] Specifically, the first wavelength may be set differently from the wavelengths of other optical transceivers connected to the transmission line.

[0016] Specifically, the wavelength of the optical signal received by the receiving circuit may be the same as the first wavelength.

[0017] A computer program stored in a computer-readable recording medium according to an embodiment of the present invention may include a computer program comprising instructions for a processor to perform at least one of the methods described above.

[0018] An optical transceiver according to an embodiment of the present invention comprises a transmitting circuit configured such that each of a plurality of terminals outputs an optical signal of the same wavelength to the same transmission line in a point-to-multipoint communication structure based on an optical splitter, a receiving circuit configured to receive an optical signal transmitted by a counterpart device, and a control circuit that controls the receiving circuit and the transmitting circuit. The control circuit is characterized by being configured such that, when an abnormal state is determined, it generates a random number, selects a slot corresponding to the random number within a certain period divided into a plurality of slots, and writes a first unique identification information into the selected slot and transmits it to the counterpart device.

[0019] A signal transmission method in a point-to-multipoint optical transmission environment according to an embodiment of the present invention is characterized in that a control circuit of an optical transceiver that outputs an optical signal of the same wavelength to a transmission line comprises the steps of: determining an abnormal state; generating a random number when the abnormal state is determined; selecting a slot corresponding to the random number within a certain period divided into a plurality of slots; and writing unique identification information in the selected slot and transmitting it.

[0020] According to the present invention, the invention supports verifying an optical line using a more simplified dedicated optical receiver.

[0021] In addition, the present invention can support the more flexible transmission of unique identification information and easy identification in actual optical transmission sites using various wavelength combinations.

[0022] In addition, various effects other than those described above may be disclosed directly or implicitly in the detailed description according to the embodiments of the present invention to be described below.

[0023] FIG. 1 is a diagram showing an example of a signal transmission system environment in a wavelength multiplex optical transmission environment according to an embodiment of the present invention.

[0024] FIG. 2 is a drawing showing an example of an optical transceiver connected to an optical connector according to an embodiment of the present invention.

[0025] FIG. 3 is a drawing showing an example of a dedicated receiver configuration according to an embodiment of the present invention.

[0026] FIG. 4 is a diagram showing an example of a signal transmission method in an abnormal mode of a plurality of optical transceivers according to an embodiment of the present invention.

[0027] FIG. 5 is a diagram showing an example of slot overlap during the transmission of unique identification information based on time-division multiplexing.

[0028] FIG. 6 is a diagram showing an example of a transmission method of unique identification information according to random slot selection according to an embodiment of the present invention.

[0029] FIG. 7 is a diagram showing an example of signal transmission switching of optical transceivers according to an embodiment of the present invention.

[0030] FIG. 8 is a diagram showing an example of an operation method of an optical transceiver that supports signal transmission in a wavelength multiplex optical transmission environment according to an embodiment of the present invention.

[0031] FIG. 9 is a diagram showing an example of a dedicated receiver operation method that supports unique identification information processing according to an embodiment of the present invention.

[0032] In order to clarify the features and advantages of the means for solving the problem of the present invention, the present invention will be described in more detail with reference to specific embodiments of the present invention illustrated in the attached drawings.

[0033] However, detailed descriptions of known functions or configurations that may obscure the essence of the invention are omitted in the following description and the attached drawings. Additionally, it should be noted that identical components throughout the drawings are indicated by the same reference numerals whenever possible.

[0034] Terms and words used in the following description and drawings should not be interpreted as being limited to their ordinary or dictionary meanings, but should be interpreted in a meaning and concept consistent with the technical spirit of the invention, based on the principle that the inventor can appropriately define the concept of terms to best describe his invention. Accordingly, the embodiments described in this specification and the configurations illustrated in the drawings are merely the most preferred embodiments of the invention and do not represent all aspects of the technical spirit of the invention; therefore, it should be understood that various equivalents and modifications capable of replacing them may exist at the time of filing this application.

[0035] Furthermore, terms including ordinal numbers, such as first, second, etc., are used to describe various components and are used solely for the purpose of distinguishing one component from another, and are not used to limit said components. For example, without departing from the scope of the present invention, the second component may be named the first component, and similarly, the first component may be named the second component.

[0036] Furthermore, the terms used in this specification are used merely to describe specific embodiments and are not intended to limit the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. Additionally, terms such as “comprising” or “having” described in this specification are intended to indicate the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof.

[0037] Additionally, terms such as "part," "unit," and "module" as described in the specification refer to a unit that processes at least one function or operation, which may be implemented in hardware, software, or a combination of hardware and software. Furthermore, "one (a or an)," "one," "the," and similar related terms may be used in the context describing the invention (particularly in the context of the following claims) in a sense that includes both singular and plural forms, unless otherwise indicated in the specification or clearly contradicted by the context.

[0038] In addition to the terms described above, specific terms used in the following description are provided to aid in understanding the present invention, and the use of such specific terms may be modified in other forms without departing from the technical spirit of the present invention.

[0039] In addition, embodiments within the scope of the present invention include a computer-readable medium having or transmitting computer-executable instructions or data structures stored on a computer-readable medium. Such a computer-readable medium may be any available medium accessible by a general-purpose or special-purpose computer system. For example, such a computer-readable medium may include, but is not limited to, physical storage media such as RAM, ROM, EPROM, CD-ROM or other optical disk storage devices, magnetic disk storage devices or other magnetic storage devices, or any other medium accessible by a general-purpose or special-purpose computer system that can be used to store or transmit certain program code means in the form of computer-executable instructions, computer-readable instructions or data structures.

[0040] The system environment to which the signal transmission method in a wavelength multiplexing optical transmission environment and the optical transceiver supporting the same according to the present invention are applied may, for example, be a system environment for providing 5G (generation) communication services. The system environment supporting the provision of 5G mobile communication services may, for example, include a plurality of digital signaling units (DU) and a plurality of wireless base station units (RU). Each digital signaling unit and wireless base station unit possesses optical transceivers (Small Form-factor Pluggable, SFP) for optical signal transmission, and the optical transceivers, each transmitting and receiving different wavelengths for wavelength multiplexing, may be connected to an optical multiplexer by forming a line with a single optical fiber. Here, each optical transceiver may determine the occurrence of a failure situation by identifying that an optical signal is not received for a preset time or longer. When a failure state occurs, each optical transceiver stops normal data transmission and operates by switching to a mode that transmits a unique identification number of the optical transceiver. However, the point at which the device switches to a mode for transmitting identification numbers may be set to a certain time after the occurrence of a failure, depending on the user's operating conditions. In this case, if a wavelength separation unit is applied to the receiving side considering wavelength multiplexing where multiple optical channels share a single line, the scope of use may be limited in actual field environments where various wavelength combinations are used. Accordingly, the present invention describes a method for verifying rotation information in an abnormal mode tailored to actual field environments and the operation of an optical transceiver for this purpose.

[0041] Hereinafter, the types and roles of each component of the system utilizing the signal transmission method in a wavelength multiplexing optical transmission environment of the present invention and the optical transceiver supporting the same will be described.

[0042] FIG. 1 is a diagram showing an example of a signal transmission system environment in a wavelength multiplex optical transmission environment according to an embodiment of the present invention.

[0043] Referring to FIG. 1, the signal transmission system environment (10) operated in the wavelength multiplex optical transmission environment of the present invention may include first to fourth radio base station devices (101, 102, 103, 104) (radio unit), a first wavelength separation unit (301), a transmission line (400), a second wavelength separation unit (302), and first to fourth digital signal devices (105, 106, 107, 108) (digital unit). When a fault (11) occurs in the signal transmission system environment (10), a dedicated receiver (500) may collect optical signals transmitted and received through the transmission line (400) in the area where the fault (11) occurred, and provide optical line information through verification of the collected signal.

[0044] The first to fourth wireless base station devices (101, 102, 103, 104) may include, for example, a first wireless base station device (101), a second wireless base station device (102), a third wireless base station device (103), and a fourth wireless base station device (104) that support 5G mobile communication services. Here, each of the first to fourth wireless base station devices (101, 102, 103, 104) is an example of a configuration in which the first to fourth optical transceiver devices (201, 202, 203, 204) are arranged, and the number or characteristics of the wireless base station devices do not limit the present invention. For example, at least one of the first to fourth wireless base station devices (101, 102, 103, 104) may be a wireless base station device that supports mobile communication services such as 4G, 5G, and 6G, and the number of wireless base station devices of the present invention may be replaced with fewer than four or more than four wireless base station devices. A first optical transceiver (201) may be disposed in the first wireless base station device (101), a second optical transceiver (202) may be disposed in the second wireless base station device (102), a third optical transceiver (203) may be disposed in the third wireless base station device (103), and a fourth optical transceiver (204) may be disposed in the fourth wireless base station device (104).

[0045] The first optical transceiver (201) may be designed to transmit a preset optical signal of a first wavelength to a first wavelength separator (301) in normal mode, receive an optical signal of a first wavelength transmitted by the first wavelength separator (301), convert the received optical signal of a first wavelength into an electrical signal, and then transmit it to the first wireless base station device (101). For example, the first optical transceiver (201) may receive data transmitted from the first wireless base station device (101) to the first digital signal device (105) in normal mode (or normal state), convert the received data into an optical signal of a first wavelength, and transmit it to the first wavelength separator (301). Additionally, the first optical transceiver (201) can notify the first wireless base station device (101) of the occurrence of a fault (11) in an abnormal mode (or abnormal state), convert a preset first unique identification information into an optical signal of a first wavelength, and then transmit it to the transmission line (400) through the first wavelength separator (301). In this process, the first optical transceiver (201) can transmit the first unique identification information at a preset fixed synchronization time. Alternatively, the first optical transceiver (201) can divide a preset designated period into multiple slots corresponding to a preset fixed time interval, select a specific slot or select a specific slot in a random manner, and then transmit the first unique identification information to the first wavelength separator (301) by loading it onto the selected slot. The number of the multiple slots can be a number greater than or equal to the number of multiple optical transceivers connected to the first wavelength separator (301). When entering an abnormal mode due to the occurrence of a fault (11), the first optical transceiver (201) may operate only as a transmitter that transmits an optical signal of a first wavelength corresponding to the first unique identification information, or may operate only as a receiver that receives an optical signal of a first wavelength.Alternatively, during the first to nth period, a transmission function of transmitting an optical signal of a first wavelength corresponding to the first unique identification information may be performed, and during the n+1th to mth period, a reception function of receiving an optical signal of the first wavelength may be performed. Alternatively, the first optical transceiver (201) may simultaneously perform the transmission of the first unique identification information and the reception of the designated unique identification information (e.g., the unique identification information of the fifth optical transceiver (205) installed in the first digital signal device (105).

[0046] The second optical transceiver (202) may be designed to transmit a second wavelength optical signal to the first wavelength separator (301) in normal mode, receive the second wavelength optical signal transmitted by the first wavelength separator (301), convert the received second wavelength optical signal into an electrical signal, and then transmit it to the second wireless base station device (102). The second wavelength optical signal may have a different wavelength value compared to the first wavelength optical signal. For example, in normal mode, the second optical transceiver (202) may receive data that the second wireless base station device (102) transmits to the second digital signal device (106), convert the received data into a second wavelength optical signal, and transmit it to the first wavelength separator (301). Additionally, in abnormal mode, the second optical transceiver (202) may convert a pre-set second unique identification information into a second wavelength optical signal and transmit it to the first wavelength separator (301). In this process, the second optical transceiver (202) may transmit the second unique identification information to the first wavelength separator (301) at a predefined fixed synchronization time. Alternatively, the second optical transceiver (202), similar to the first optical transceiver (201), may divide a predefined designated period into a predefined number of slots (e.g., a number greater than the number of optical transceivers), select a specific slot or randomly select a slot, and then transmit the second unique identification information to the first wavelength separator (301) by loading it onto the selected slot. In abnormal mode, the second optical transceiver (202) may operate only as a transmitter that transmits an optical signal of the second wavelength corresponding to the second unique identification information (e.g., identification information different from the first unique identification information), or may operate only as a receiver that receives an optical signal of the second wavelength. Alternatively, during the first to nth period, a transmitting function can be performed to transmit an optical signal of a second wavelength corresponding to second unique identification information, and during the n+1th to mth period, a receiving function can be performed to receive an optical signal of a second wavelength.Alternatively, the second optical transceiver (202) may perform a receiving function of receiving unique identification information transmitted by the sixth optical transceiver (206) installed in the second digital signal device (106), in addition to performing a transmitting function of transmitting the second unique identification information.

[0047] The third optical transceiver (203) may be designed to, in normal mode, transmit a predefined optical signal of a third wavelength to the first wavelength separator (301), receive the optical signal of a third wavelength transmitted by the first wavelength separator (301), convert the received optical signal of a third wavelength into an electrical signal, and then transmit it to the third wireless base station device (103). The optical signal of the third wavelength may have a different wavelength value when compared with the optical signal of the first wavelength and the optical signal of the second wavelength. For example, in normal mode, the third optical transceiver (203) may receive data that the third wireless base station device (103) transmits to the third digital signal device (107), convert the received data into an optical signal of a third wavelength, and transmit it to the first wavelength separator (301). Additionally, in abnormal mode, the third optical transceiver (203) may convert pre-set third unique identification information into an optical signal of a third wavelength and transmit it to the first wavelength separator (301). In this process, the third optical transceiver (203) may transmit the third unique identification information to the first wavelength separator (301) at a predefined fixed synchronization time. Alternatively, the third optical transceiver (203) may divide a predefined designated period by the number of slots described in the other optical transceivers above, select a specific predefined slot or select a slot in a random manner, and then transmit the third unique identification information to the first wavelength separator (301) by loading it onto the selected slot. In abnormal mode, the third optical transceiver (203) may operate only as a transmitter that transmits an optical signal of the third wavelength corresponding to the third unique identification information (e.g., identification information different from the first and second unique identification information) or may operate only as a receiver that receives an optical signal of the third wavelength.Alternatively, during the first to nth period, it may perform a transmission function of transmitting an optical signal of a third wavelength corresponding to the third unique identification information, and during the n+1th to mth period, it may perform a reception function of receiving an optical signal of a third wavelength. Alternatively, the third optical transceiver (203) may perform a transmission function of transmitting the third unique identification information, and at the same time, perform a reception function of receiving the unique identification information transmitted by the seventh optical transceiver (207) installed in the third digital signal device (107).

[0048] The fourth optical transceiver (204) may be designed to, in normal mode, transmit a fourth wavelength optical signal to the first wavelength separator (301), receive a fourth wavelength optical signal transmitted by the first wavelength separator (301), convert the received fourth wavelength optical signal into an electrical signal, and then transmit it to the fourth wireless base station device (104). The fourth wavelength optical signal may have a wavelength with a value different from the first to third wavelength optical signals. For example, in normal mode, the fourth optical transceiver (204) may receive data to be transmitted by the fourth wireless base station device (104) to the fourth digital signal device (108), convert the received data into a fourth wavelength optical signal, and transmit it to the first wavelength separator (301). Additionally, in abnormal mode, the fourth optical transceiver (204) can convert a preset fourth unique identification information (e.g., identification information different from the first to third unique identification information) into a fourth wavelength optical signal and transmit it to the first wavelength separator (301). In this process, the fourth optical transceiver (204) can transmit the fourth unique identification information (or the corresponding fourth wavelength optical signal) to the first wavelength separator (301) at a preset fixed synchronization time. Alternatively, the fourth optical transceiver (204) can divide a preset designated period by the number of multiple slots applied to the other optical transceiver described above, select a specific slot or select a specific slot in a random manner, and then transmit the fourth unique identification information to the first wavelength separator (301) by loading it onto the selected slot. In abnormal mode, the fourth optical transceiver (204) may operate only as a transmitter that transmits a fourth wavelength optical signal corresponding to the fourth unique identification information, or only as a receiver that receives a fourth wavelength optical signal.Alternatively, during the first to nth period, it may perform a transmission function of transmitting an optical signal of a fourth wavelength corresponding to the fourth unique identification information, and during the n+1th to mth period, it may perform a reception function of receiving an optical signal of a fourth wavelength. Alternatively, the fourth optical transceiver (204) may perform a transmission function of transmitting the fourth unique identification information, and at the same time perform a reception function of receiving the unique identification information transmitted by the eighth optical transceiver (208) installed in the fourth digital signal device (108).

[0049] The first wavelength separation unit (301) may be connected to the first optical transceiver (201) via a first line, connected to the second optical transceiver (202) via a second line, connected to the third optical transceiver (203) via a third line, and connected to the fourth optical transceiver (204) via a fourth line. The first wavelength separation unit (301) may transmit optical signals transmitted by the first to fourth optical transceivers (201, 202, 203, 204) to the second wavelength separation unit (302) via a transmission line (400). For example, in normal mode, the first wavelength separation unit (301) receives a first wavelength optical signal converted into an optical signal of the first wireless base station device (101) transmitted by the first optical transceiver (201), a second wavelength optical signal converted into an optical signal of the second wireless base station device (102) transmitted by the second optical transceiver (202), a third wavelength optical signal converted into an optical signal of the third wireless base station device (103) transmitted by the third optical transceiver (203), and a fourth wavelength optical signal converted into an optical signal of the fourth wireless base station device (104) transmitted by the fourth optical transceiver (204), and can transmit the received first to fourth wavelength optical signals to a transmission line (400). Additionally, the first wavelength separation unit (301) can transmit the optical signal received from the second wavelength separation unit (302) to the first to fourth optical transceivers (201, 202, 203, 204) through the transmission line (400).

[0050] The transmission line (400) may be composed of a single optical fiber. The transmission line (400) may transmit optical signals of multiple wavelengths through a single optical fiber. As another example, the transmission line (400) may be composed of optical fibers laid in a bundle form in an enclosure. The transmission line (400) may be positioned between the first wavelength separation unit (301) and the second wavelength separation unit (302). The transmission line (400) may transmit optical signals of multiple wavelengths through a single optical fiber. For example, in normal mode, the transmission line (400) can transmit a first wavelength optical signal corresponding to data of the first wireless base station device (101), a second wavelength optical signal corresponding to data of the second wireless base station device (102), a third wavelength optical signal corresponding to data of the third wireless base station device (103), and a fourth wavelength optical signal corresponding to data of the fourth wireless base station device (104) from the first wavelength separation unit (301) to the second wavelength separation unit (302). Alternatively, the transmission line (400) may transmit an optical signal of a first wavelength (or fifth wavelength) corresponding to data of a first digital signal device (105), an optical signal of a second wavelength (or sixth wavelength) corresponding to data of a second wireless base station device (102), an optical signal of a third wavelength (or seventh wavelength) corresponding to data of a third wireless base station device (103), and an optical signal of a fourth wavelength (or eighth wavelength) corresponding to data of a fourth wireless base station device (104) from a second wavelength separation unit (302) to a first wavelength separation unit (301).

[0051] Meanwhile, the present invention exemplifies that the first to fourth digital signal devices (105, 106, 107, 108) communicating with the first to fourth wireless base station devices (101, 102, 103, 104), respectively, use the same first to fourth wavelengths, but the present invention is not limited thereto. For example, the first wireless base station device (101) (or the second wireless base station device (102), or the third wireless base station device (103), or the fourth wireless base station device (104)) and the first digital signal device (105) (or the second digital signal device (106), or the third digital signal device (107), or the fourth digital signal device (108)) have been described as performing communication using an optical signal of a first wavelength (or the second wavelength, or the third wavelength, or the fourth wavelength) as previously described, but the first wireless base station device (101) (or the second wireless base station device (102), or the third wireless base station device (103), or the fourth wireless base station device (104)) and the first digital signal device (105) (or the second digital signal device (106), or the third digital signal device (107), or the fourth digital signal device (108)) may also communicate using optical signals of different wavelengths.

[0052] The first to fourth digital signal devices (105, 106, 107, 108) may include, for example, a first digital signal device (105), a second digital signal device (106), a third digital signal device (107), and a fourth digital signal device (108) that support 5G mobile communication services. Each of the first to fourth digital signal devices (105, 106, 107, 108) can perform data transmission and reception necessary for the operation of each of the first to fourth wireless base station devices (101, 102, 103, 104). The first to fourth digital signal devices (105, 106, 107, 108) are an example of a configuration in which the fifth to eighth optical transceiver devices (205, 206, 207, 208) are arranged, and the number or characteristics of the digital signal devices do not limit the present invention. For example, at least one of the first to fourth digital signal devices (105, 106, 107, 108) may be a digital signal device that supports mobile communication services such as 4G, 5G, and 6G, and the number of digital signal devices including optical transceivers connected to a single wavelength separation unit may be replaced with fewer than four or more than four digital signal devices. A fifth optical transceiver (205) may be disposed in the first digital signal device (105), a sixth optical transceiver (206) may be disposed in the second digital signal device (106), a seventh optical transceiver (207) may be disposed in the third digital signal device (107), and an eighth optical transceiver (208) may be disposed in the fourth digital signal device (108).

[0053] The fifth optical transceiver (205) may be designed to transmit a first wavelength optical signal to the second wavelength separation unit (302), or to receive the first wavelength optical signal transmitted by the second wavelength separation unit (302), convert it into an electrical signal, and transmit the converted electrical signal to the first digital signal device (105). For example, the fifth optical transceiver (205) may receive data transmitted by the first digital signal device (105) in normal mode, convert the received data into a first wavelength optical signal, and transmit it to the second wavelength separation unit (302). The first wavelength optical signal may include an optical signal of the same wavelength as the first wavelength optical signal operated by the first optical transceiver (201). Additionally, in abnormal mode, the fifth optical transceiver (205) may convert a pre-set fifth unique identification information into a first wavelength optical signal and transmit it to the second wavelength separation unit (302). In this process, the fifth optical transceiver (205) can transmit the fifth unique identification information to the second wavelength separator (302) by loading it onto a specific slot or a randomly selected slot among a predefined fixed synchronization time, a predefined designated period consisting of a plurality of slots. In abnormal mode, the fifth optical transceiver (205) can perform at least one of the functions of transmitting the fifth unique identification information and receiving the first unique identification information.

[0054] The sixth optical transceiver (206) may be designed to transmit a second wavelength optical signal to the second wavelength separation unit (302), receive the second wavelength optical signal transmitted by the second wavelength separation unit (302), convert the received second wavelength optical signal into an electrical signal, and then transmit it to the second digital signal device (106). The second wavelength optical signal may include an optical signal of the same wavelength as the second wavelength optical signal operated by the second optical transceiver (202). For example, the sixth optical transceiver (206) may convert data from the second digital signal device (106) into a second wavelength optical signal in normal mode and transmit it to the second wavelength separation unit (302). Additionally, in abnormal mode, the sixth optical transceiver (206) may convert a preset sixth unique identification information (e.g., identification information different from the fifth unique identification information) into a second wavelength optical signal and transmit it to the second wavelength separation unit (302). In this process, the sixth optical transceiver (206) can transmit the sixth unique identification information to the second wavelength separator (302) by loading it onto a slot selected in a fixed manner or randomly selected in a designated period consisting of a predefined fixed synchronization point or a plurality of slots. In abnormal mode, the sixth optical transceiver (206) can perform at least one of the functions of transmitting the sixth unique identification information and receiving the second unique identification information.

[0055] The above-described seventh optical transceiver (207) may be designed to transmit a third wavelength optical signal to the second wavelength separation unit (302), collect the third wavelength optical signal transmitted by the second wavelength separation unit (302), convert the collected third wavelength optical signal into an electrical signal, and then transmit it to the third digital signal device (107). Here, the third wavelength optical signal may include an optical signal of the same wavelength as the third wavelength optical signal operated by the third optical transceiver (203). For example, the seventh optical transceiver (207) may convert the data of the third digital signal device (107) into a third wavelength optical signal in normal mode and transmit it to the second wavelength separation unit (302). Additionally, in abnormal mode, the seventh optical transceiver (207) can convert a preset seventh unique identification information (e.g., identification information different from the fifth and sixth unique identification information) into a third wavelength optical signal and transmit it to the second wavelength separator (302). In this process, the seventh optical transceiver (207) can transmit the seventh unique identification information to the second wavelength separator (302) by loading it onto a slot selected in a fixed manner or randomly selected within a predefined fixed synchronization point or a designated period consisting of a plurality of slots. In abnormal mode, the seventh optical transceiver (207) can perform at least one of a transmission function that transmits the seventh unique identification information and a function that receives the third unique identification information.

[0056] The eighth optical transceiver (208) may be designed to transmit a fourth wavelength optical signal to the second wavelength separation unit (302), collect the fourth wavelength optical signal transmitted by the second wavelength separation unit (302), convert the collected fourth wavelength optical signal into an electrical signal, and then transmit the converted electrical signal to the fourth digital signal device (108). The fourth wavelength optical signal may be a signal of the same wavelength range as the fourth wavelength optical signal operated by the fourth optical transceiver (204). For example, the eighth optical transceiver (208) may convert the data of the fourth digital signal device (108) into a fourth wavelength optical signal in normal mode and transmit it to the second wavelength separation unit (302). Additionally, in abnormal mode, the eighth optical transceiver (208) can convert a preset eighth unique identification information (e.g., identification information different from the fifth to seventh unique identification information) into a fourth wavelength optical signal and transmit it to the second wavelength separator (302). In this process, the eighth optical transceiver (208) can select a specific slot within a designated period consisting of a plurality of slots, which is a preset fixed synchronization point or as described above, in a fixed or random manner, and transmit the eighth unique identification information to the second wavelength separator (302) by loading it onto the selected slot. In abnormal mode, the eighth optical transceiver (208) can perform at least one of a transmission function that transmits a fourth wavelength optical signal corresponding to the eighth unique identification information and a reception function that receives the fourth unique identification information.

[0057] The second wavelength separation unit (302) may be connected to the fifth optical transceiver (205) via a fifth line, connected to the sixth optical transceiver (206) via a sixth line, connected to the seventh optical transceiver (207) via a seventh line, and connected to the eighth optical transceiver (208) via an eighth line. The second wavelength separation unit (302) may transmit optical signals transmitted by the fifth to eighth optical transceivers (205, 206, 207, 208) to the first wavelength separation unit (301) via a transmission line (400). For example, in normal mode, the second wavelength separation unit (302) receives a first wavelength optical signal converted into an optical signal of the first digital signal device (105) transmitted by the fifth optical transceiver (205), a second wavelength optical signal converted into an optical signal of the second digital signal device (106) transmitted by the sixth optical transceiver (206), a third wavelength optical signal converted into an optical signal of the third digital signal device (107) transmitted by the seventh optical transceiver (207), and a fourth wavelength optical signal converted into an optical signal of the fourth digital signal device (108) transmitted by the eighth optical transceiver (208), and can transmit the received first to fourth wavelength optical signals to a transmission line (400). Alternatively, the second wavelength separation unit (302) may receive, in an abnormal mode, the fifth unique identification information transmitted by the fifth optical transceiver (205), the sixth unique identification information transmitted by the sixth optical transceiver (206), the seventh unique identification information transmitted by the seventh optical transceiver (207), and the eighth unique identification information transmitted by the eighth optical transceiver (208), and transmit the received fifth to eighth unique identification information to the transmission line (400). Additionally, the second wavelength separation unit (302) may transmit the optical signal received from the first wavelength separation unit (301) to the fifth to eighth optical transceivers (205, 206, 207, 208) through the transmission line (400).

[0058] The dedicated receiver (500) above is connected to a transmission line (400) where a fault (11) has occurred and can collect optical signals flowing through the transmission line (400). The dedicated receiver (500) can analyze the collected optical signals to detect unique identification information carried in the optical signals, and by verifying the detected unique identification information, it can support verifying optical line information using the transmission line (400). The dedicated receiver (500) may further include an output device (e.g., a display device) capable of outputting the detected unique identification information. Alternatively, the dedicated receiver (500) may further include a communication circuit capable of transmitting the detected unique identification information to a designated server (e.g., a wired management server). Alternatively, the dedicated receiver (500) may further include a memory capable of storing the detected unique identification information. As illustrated in FIG. 1, the dedicated receiver (500) may be connected to both ends of the transmission line (400) or to only one end of the transmission line (400). For example, if a fault (11) occurs on the transmission line (400), the dedicated receiver (400) may be connected only to one end of the transmission line (400) to which the first to fourth optical transceivers (201, 202, 203, 204) installed in a plurality of wireless base station devices (101, 102, 103, 104) are connected, or to only the other end of the transmission line to which the fifth to eighth optical transceivers (205, 206, 207, 208) installed in a plurality of digital signal devices (105, 106, 107, 108) are connected.

[0059] In a signal transmission system environment (10) operated in a wavelength multiplex optical transmission environment according to the above-described embodiment of the present invention, when the first to fourth optical transceivers (201, 202, 203, 204) and the fifth to eighth optical transceivers (205, 206, 207, 208), respectively installed in a plurality of wireless base station devices (101, 102, 103, 104) and a plurality of digital signal devices (105, 106, 107, 108), transmit by loading their unique identification information onto a fixed slot of a specific period or a slot selected in a random manner in an abnormal mode (e.g., a situation where an optical line is disconnected) in which a fault (11) occurs in the transmission line (400), a dedicated receiver (500) that detects the signal flowing through the transmission line (400) checks the unique identification information of the received slot with a certain probability, and the optical line transmitted through the corresponding transmission line (400) It can support checking information. The present invention allows the dedicated receiver (500) for checking line information in abnormal mode to check optical line information without a wavelength separation unit, thereby simplifying the implementation of the dedicated receiver (500) and improving the manufacturing cost of the device accordingly.

[0060] FIG. 2 is a diagram showing an example of an optical transceiver connected to an optical connector according to an embodiment of the present invention.

[0061] Here, FIG. 2 shows only a part of the configuration of the system environment (10). Referring to FIG. 1 and FIG. 2, the system environment (10) according to an embodiment of the present invention may include at least a connector (300) and an optical transceiver (200).

[0062] The connector (300) may include a connector receiving portion (300_rv) and a connector transmitting portion (300_tr). The connector receiving portion (300_rv) may include a Loss of Signal (LOS) port (e.g., a fault notification port), a VCC port, a first signal receiving port (RD+) and a second signal receiving port (RD-) for receiving optical signals. The connector receiving portion (300_rv) may include a portion in which the optical transceiver (200) transmits a signal to a host device (e.g., a wireless base station device or a digital signal device). The connector transmitting portion (300_tr) may include a VCC port, a first signal transmitting port (Tx+), a second signal transmitting port (Tx-), a Disable port, and a Fault port. The connector transmitting portion (300_tr) may include a portion in which the host device transmits data or a designated signal to the optical transceiver (200). The connector (300) may be disposed in each of the aforementioned first to fourth optical transceivers (201, 202, 203, 204) and fifth to eighth optical transceivers (205, 206, 207, 208) so as to be connected to the optical transceiver (200), or may be included as a component of the first to fourth optical transceivers (201, 202, 203, 204) and fifth to eighth optical transceivers (205, 206, 207, 208).

[0063] The optical transceiver (200) may include a combo circuit (210), a receiving circuit (230) (or a receiving device, receiver), a transmitting circuit (240) (or a transmitting device, transmitter), a temperature control circuit (250) (or a temperature control module), and a control circuit (220) (or a Micro Controller Unit, MCU) (or a controller, micro control unit). An optical transceiver (200) of this configuration may be at least one of the first to fourth optical transceivers (201, 202, 203, 204) and the fifth to eighth optical transceivers (205, 206, 207, 208) described above.

[0064] The above combo circuit (210) may include a limiting amplifier circuit (211) and a laser diode driver (212) (or a laser diode driver controller). The limiting amplifier circuit (211) may perform the function of limiting the input level of a signal transmitted to a host device. For example, the limiting amplifier circuit (211) may limit the level of an optical signal received and transmitted by the receiving circuit (230) to a preset size and then transmit it to the host device through the connector receiving portion (300_rv). Alternatively, the limiting amplifier circuit (211) may amplify the electrical signal received by the receiving circuit (230) (e.g., avalanche photo diode) and convert it into a signal that is easy for the host device to identify as 0 or 1. The limiting amplifier circuit (211) may detect the occurrence of LOS and transmit the corresponding information to the host device through the LOS port. The limiting amplifier circuit (211) may limit the signal input level according to the control of the laser diode driver (212), which is controlled by the control circuit (220).

[0065] The laser diode driver (212) can control (or modulate) the laser diode of the transmission circuit (240) in response to data transmitted through the control of the control circuit (220) and the connector transmission part (300_tr). In this regard, the laser diode driver (212) may include wiring capable of receiving feedback of the signal of the laser diode included in the transmission circuit (240) (e.g., feedback from a monitor photodiode placed in the transmission circuit (240) to monitor the laser diode).

[0066] The receiving circuit (230) (Receiver Optical Sub-Assembly, ROSA) may include an Avalanche Photodiode (APD) and a Pre-Amplifier. The Pre-Amplifier may be configured to amplify a signal transmitted through a transmission line (400) (e.g., single mode fiber, SMF) by a preset size and then transmit it to the APD. The APD is a photodiode (PD) having an internal photocurrent amplification mechanism and is an optical detector capable of detecting a signal transmitted through the transmission line (400). The APD may be used for detecting optical signals of 100 Mb / s or 10 GHz or higher. The APD may transmit the detected electrical signal to a limiting amplifier circuit (211). In this process, the APD may transmit an optical signal of a specific wavelength to the limiting amplifier circuit (211) in response to the control of the control circuit (220).

[0067] The above-mentioned transmitting circuit (240) (Transmitter Optical Sub Assembly, TOSA) may be composed of a laser diode (e.g., Laser Diode) and a monitor diode (e.g., Monitor Photo Diode). The laser diode is a device that emits light using semiconductor recombination light emission and can output a modulated signal according to the bias current control of the laser diode driver (212). The monitor diode (or monitor photo diode) can generate a current that is partially proportional to the optical power of the laser diode. The monitor diode may be integrated into a laser diode package. The current generated by the monitor diode is delivered to the laser diode driver (212) and can be used for laser diode modulation.

[0068] The temperature control circuit (250) can sense the temperature of the optical transceiver (200) and control the operation to adjust the temperature of the optical transceiver (200) according to the sensed temperature. For example, the temperature control circuit (250) can communicate with the control circuit (220) to control the operation of the receiving circuit (230) or the transmitting circuit (240) so as to lower the temperature of the optical transceiver (200). In this regard, the optical transceiver (200) may include at least one temperature sensor for temperature sensing.

[0069] The control circuit (220) is responsible for the overall control of driving the optical transceiver device (200). The control circuit (220) communicates with a host device (e.g., first to fourth wireless base station devices (101, 102, 103, 104) or first to fourth digital signal devices (105, 106, 107, 108)) to receive commands from the host device, and can control the transmission of optical signals by the optical transceiver device (200) or the conversion and transmission of received optical signals into electrical signals according to the received commands. The control circuit (220) can check temperature information collected from a temperature sensor and control the temperature of the optical transceiver device (200) by adjusting the temperature control circuit (250).

[0070] As an example, the control circuit (220) can determine an abnormal state of the optical line and, when an abnormal state occurs, control the transmission of unique identification information of the optical transceiver (200). In this regard, the optical transceiver (200) further includes a voltage sensor capable of sensing the voltage of the receiving circuit (230) and can detect the intensity of the received optical signal through the voltage sensor. The control circuit (220) determines that an abnormal state has occurred when the detected optical signal is lower than a predefined value and can control the transmission of designated unique identification information by stopping the operation according to the abnormal mode, such as data transmission. In relation to the transmission of unique identification information, the control circuit (220) can control the laser diode driver (212) to modulate the laser diode of the transmitting circuit (240) so that an optical signal corresponding to the predefined unique identification information is irradiated. In this process, the control circuit (220) may divide a pre-set fixed period into multiple slots and control the transmission line (400) to output unique identification information to a specific slot among the divided multiple slots. Alternatively, the control circuit (220) may divide a pre-set fixed period into multiple slots, select one of the multiple slots using a random selection method, and then control the transmission of the selected slot by writing unique identification information to it.

[0071] The control circuit (220) can check whether an optical signal is received through the receiving circuit (230) in an abnormal mode. The control circuit (220) can determine that the transmission line (400) is restored if an optical signal above a predefined level is received, and can perform data transmission and reception operations. Alternatively, if an optical signal above a certain level is received, the control circuit (220) can control the received optical signal to be converted into an electrical signal and check whether the converted electrical signal is valid as pre-set unique identification information. For example, the control circuit (220) can check whether the received electrical signal deviates from a pre-set unique identification information system. If pre-set unique identification information is received, the control circuit (220) can control the receiving circuit (230) to transmit it to the limiting amplifier circuit (211). If the received unique identification information is pre-set unique identification information, it can determine that the transmission line (400) is restored to normal and support the performance of data transmission and reception by the host device. Meanwhile, if the received unique identification information is different from the preset unique identification information, it is determined that the transmission line (400) has recovered abnormally, and an abnormal recovery notification may be sent to the host device or an abnormal recovery message may be sent to the designated terminal.

[0072] In relation to the performance of the above-described operation, the control circuit (220) includes a memory, and the memory may store information necessary for the operation of the transmission circuit (240), reference values ​​of sensors, control values, or control commands. The control circuit (220) may perform at least one of the following operations: monitoring of light output by the laser diode of the transmission circuit (240), converting the light signal into an electrical signal and converting the electrical signal into a light signal, temperature sensing, voltage sensing, modulation of the laser diode, and amplification control of the limiting amplifier circuit (211).

[0073] As an example, an optical transceiver device (200) according to an embodiment of the present invention may include at least one of the first to fourth optical transceivers (201-204) and the fifth to eighth optical transceivers (205-208) described above in FIG. 1. Additionally, the optical transceiver device (200) may be configured to include only a transmitting circuit (240), a receiving circuit (230), and a control circuit (250). The transmitting circuit (240) is configured such that, in a point-to-multipoint communication structure based on an optical splitter (or wavelength separation unit (301, 302) of FIG. 1), each of a plurality of terminals (or a plurality of devices, or transmitting devices) outputs an optical signal of the same wavelength to the same transmission line, and the receiving circuit (230) is configured to receive an optical signal transmitted by a counterpart device (e.g., another optical transceiver or receiving device connected via the transmission line (400)), and the control circuit (250) may be configured to control the receiving circuit (230) and the transmitting circuit (240). For example, the control circuit (250) may be configured to generate a random number when determined to be in an abnormal state, select a slot corresponding to the random number within a certain period divided into a plurality of slots, and write a first unique identification information in the selected slot and transmit it to the counterpart device.

[0074] As an example, the control circuit of the first optical transceiver (201) may be configured to generate a random number when determined to be in an abnormal state, select a slot corresponding to the random number within a certain period divided into multiple slots, and write a first unique identification information in the selected slot and transmit it to the fifth optical transceiver (205). Additionally, the control circuit of the second optical transceiver (202) may be configured to generate a random number when determined to be in an abnormal state, select a slot corresponding to the random number within a certain period divided into multiple slots, and write a second unique identification information in the selected slot and transmit it to the sixth optical transceiver (206). As described above, the optical transceiver (200) of the present invention can perform a signal transmission method capable of distinguishing signals in a single wavelength transmission environment.

[0075] FIG. 3 is a diagram showing an example of a dedicated receiver configuration according to an embodiment of the present invention.

[0076] Referring to FIGS. 1 to 3, a dedicated receiver (500) according to an embodiment of the present invention may be simply configured to include an optical connector (510), a photodiode (520) connected to the optical connector (510), and a signal processing device (530) connected to the photodiode (520).

[0077] The optical connector (510) may include a connector that can be connected to a transmission line (400) by a dedicated receiver (500). The optical connector (510) may connect the transmission line (400) to a photodiode (520) and receive a signal flowing through the transmission line (400) and transmit it to the photodiode (520). For example, the optical connector (510) may include a connector that can be optically connected to one end of the transmission line (400) formed of a single optical fiber and an optical cable that can be connected to the photodiode (520).

[0078] The above photodiode (520) may include, for example, a PIN photodiode or an avalanche photodiode. Additionally, or generally, the dedicated receiver (500) may further include a preamplifier capable of amplifying an optical signal transmitted through the optical connector (510) before the photodiode (520) receives the signal. In this case, the photodiode (520) may perform electrical signal conversion for the optical signal preamplified by the preamplifier. After converting the received optical signal into an electrical signal, the photodiode (520) may transmit the converted electrical signal to the signal processing device (530). Such a photodiode (520) may correspond to the receiving circuit (230) of the optical transceiver (200) described above in FIG. 2.

[0079] The signal processing device (530) can analyze (e.g., decoding and processing) the electrical signal transmitted by the photodiode (520) and detect unique identification information based on the analysis results. For example, the signal processing device (530) can determine whether the electrical signal transmitted by the photodiode (520) is within a pre-set unique identification information system. If the electrical signal received from the photodiode (520) is outside the unique identification information system, the signal processing device (530) can determine that it is a signal reception error and discard or discard the corresponding signal. If the electrical signal received from the photodiode (520) is within the unique identification information system, the signal processing device (530) can determine whether the corresponding unique identification information is pre-set designated unique identification information. The signal processing device (530) can store the received designated unique identification information in memory. In this regard, the dedicated receiver (500) may further include memory accessed by the signal processing device (530). Alternatively, the signal processing device (530) may transmit the stored unique identification information to a designated external device, such as a server device (or a manager’s portable terminal device) that performs wired maintenance. In this regard, the dedicated receiver may include a communication circuit, and the signal processing device (530) may transmit the unique identification information obtained from the transmission line (400) to the server device (or a manager’s portable terminal device) according to the settings or according to the input of the dedicated receiver (500) operator.

[0080] Meanwhile, as previously explained, the optical transceiver (200) may, in abnormal mode, select a slot designated according to a preset among a plurality of slots corresponding to a time size of a certain size for a certain period, or select one of the plurality of slots in a random manner and then write unique identification information. Accordingly, the signal processing device (530) may sequentially check a plurality of slots during a predefined period to collect the unique identification information of the slots where the unique identification information has been normally written and store it in memory. When the signal processing device (530) collects all the unique identification information of the plurality of optical transceivers, it may output guidance information corresponding thereto. In relation to the output of guidance information, the dedicated receiver (500) may further include a display. The signal processing device (530) may output at least a portion of the collected unique identification information through the display. The administrator can verify the optical line information transmitting and receiving signals through the corresponding transmission line (400) by checking the information.

[0081] FIG. 4 is a diagram showing an example of a signal transmission method in an abnormal mode of a plurality of optical transceivers according to an embodiment of the present invention.

[0082] Referring to FIGS. 1 to 4, the first to n optical transceivers (e.g., the first to fourth optical transceivers (201, 202, 203, 204) of FIG. 1 or the fifth to eighth optical transceivers (205, 206, 207, 208)) may, in an abnormal mode, stop the transmission of data transmitted by the host device (e.g., the first to fourth wireless base station devices (101, 102, 103, 104) or the first to fourth digital signal devices (105, 106, 107, 108)), transmit a message indicating the abnormal mode to the host device, and transmit preset unique identification information of each device through the transmission line (400). In this process, the first to n optical transceivers can divide a predefined first period (P101) into m time slots and transmit their own unique identification information (e.g., SFP 1, SFP 2, SFP 3, SFP n) by loading it into predefined fixed slots for the divided slots. When loading unique identification information into fixed slots according to a preset, as illustrated, the first unique identification information (SFP 1) can be written into the first slot (T1), the second unique identification information (SFP 2) into the second slot (T2), the third unique identification information (SFP 3) into the third slot (T3), and the nth unique identification information (SFP n) into the mth slot (Tm). As described above, the first to n optical transceivers can process the transmission of each unique identification information according to a time division multiplexing transmission method in which they occupy a slot to transmit unique identification information. The method of allocating the aforementioned fixed slot to the optical transceivers and the optical transceivers transmitting each unique identification information through the fixed slot may continue for a second period (P102) or a specified plurality of periods according to a preset.Alternatively, the optical transceivers can determine the strength of the optical signal received through the receiving circuit (230) while transmitting each unique identification information, and if the strength of the optical signal corresponds to the optical strength in a preset normal mode, stop transmitting each unique identification information and perform a normal mode switch.

[0083] When the abnormal mode is released and switched to normal mode, the first to n optical transceivers (e.g., the first to fourth optical transceivers (201, 202, 203, 204) of FIG. 1 or the fifth to eighth optical transceivers (205, 206, 207, 208)) can convert data transmitted by the host device (e.g., the first to fourth wireless base station devices (101, 102, 103, 104) or the first to fourth digital signal devices (105, 106, 107, 108)) into an optical signal of a specified wavelength and then transmit it to the transmission line (400) through a wavelength separator (e.g., the first wavelength separator (301) or the second wavelength separator (302)).

[0084] As described above, the signal transmission method in a point-to-many optical transmission environment of the present invention may include a control circuit of an optical transceiver (200) that outputs an optical signal of the same wavelength to a transmission line, a step of determining an abnormal state, a step of generating a random number when determining the abnormal state, a step of selecting a slot corresponding to the random number within a certain period divided into a plurality of slots, and a step of writing unique identification information in the selected slot and transmitting it. Referring to the devices described in FIGS. 1 to 3, the signal transmission method of the first optical transceiver (201) may include a control circuit of the first optical transceiver (201) performing an operation of generating a random number when determining an abnormal state, an operation of selecting a slot corresponding to the random number within a certain period divided into a plurality of slots, and an operation of writing a first unique identification information in the selected slot and transmitting it to a counterpart device (e.g., a fifth optical transceiver (205) or a wavelength separation unit (302) to which the fifth optical transceiver (205) is connected). Similarly, the signal transmission method of the second optical transceiver (202) (or the third optical transceiver (203), or the fourth optical transceiver (204)) may be such that the control circuit of the second optical transceiver (202) (or the third optical transceiver (203), or the fourth optical transceiver (204)) performs the operation of generating a random number when an abnormal state is determined, the operation of selecting a slot corresponding to the random number within a certain period divided into multiple slots, and the operation of writing the second unique identification information (or the third unique identification information, or the fourth unique identification information) into the selected slot and transmitting it to a counterpart device (e.g., the sixth optical transceiver (206), the seventh optical transceiver (207), the eighth optical transceiver (208), or the wavelength separation unit (302) to which the counterpart device is connected).As described above, the signal transmission method of the present invention supports signal separation even in a single-wavelength transmission environment, thereby enabling the transmission of signals required between a transmitting device and a receiving device.

[0085] Figure 5 is a diagram showing an example of slot overlap during the transmission of unique identification information based on time-division multiplexing.

[0086] Referring to FIGS. 4 and 5, as previously described in FIG. 4, the first to nth optical transceivers (e.g., the first to fourth optical transceivers (201, 202, 203, 204) of FIG. 1 or the fifth to eighth optical transceivers (205, 206, 207, 208)) can transmit each of the pre-specified unique identification information to the transmission line (400) by carrying it in a pre-specified fixed slot according to the time division multiplexing method in an abnormal mode. Here, when the first to nth optical transceivers all carry the unique identification information in the fixed slot in accordance with the same synchronization signal, the unique identification information (or the optical signal corresponding to the unique identification information) can be placed within the designated slot, as in the state 501 of FIG. 4 or FIG. 5 described above. Meanwhile, the first to nth optical transceivers may each have a fine difference in the vibration period of the oscillator they possess, and this fine difference may have a different synchronization signal from other optical transceivers due to time accumulation. Consequently, at least some of the first to nth optical transceivers may write each unique identification information into a fixed slot according to different time references.

[0087] For example, the synchronization time of the first optical transceiver may be delayed compared to other optical transceivers, and the synchronization time of the third optical transceiver may be earlier than other optical transceivers. In this case, as in state 503, the time at which the first optical transceiver writes the first unique identification information (SFP 1) to the first fixed slot (T1) (or the first slot) may be delayed, and the time at which the third optical transceiver writes the third unique identification information (SFP 3) to the third fixed slot (T3) (or the third slot) may be earlier. Consequently, even if the second optical transceiver normally writes the second unique identification information (SFP 2) to the second fixed slot (T2) (or the second slot), it may overlap with the first unique identification information (SFP 1) and the third unique identification information (SFP 3). Consequently, when a dedicated receiver (500) receives the first to third unique identification information (SFP 1, SFP 2, SFP 3) through the first slot (T1), the second slot (T2), and the third slot (T3), a situation may occur where the latter part of the first unique identification information (SFP 1) receives a signal that overlaps with the second unique identification information (SFP 2), and the latter part of the second unique identification information (SFP 2) receives a signal that overlaps with the first part of the third unique identification information (SFP 3). When overlapping signals are received, signal separation becomes difficult, resulting in a situation where each unique identification information cannot be detected normally, and waste may occur in which signals must be continuously received and analyzed until the overlap of the unique identification information is released.

[0088] FIG. 6 is a diagram showing an example of a transmission method of unique identification information according to random slot selection according to an embodiment of the present invention.

[0089] Referring to FIG. 6, the first to n optical transceivers (e.g., the first to fourth optical transceivers (201, 202, 203, 204) or the fifth to eighth optical transceivers (205, 206, 207, 208) of FIG. 1) can divide a preset first period (601) into m slots based on time division multiplexing in an abnormal mode. Here, the number of m slots can be set to be greater than the number n. The first to n optical transceivers can randomly select a slot among the divided m slots and write unique identification information to the selected slot. Referring to the first period (601), the first optical transceiver among the first to n optical transceivers can randomly select a second slot (T2) and write first unique identification information (SFP a) to the second slot (T2). The second optical transceiver can select the fourth slot (T4) in a random manner and write the second unique identification information (SFP b) to the fourth slot (T4). The third optical transceiver can select the fourth slot (T4) in a random manner and write the third unique identification information (SFP c) to the fourth slot (T4). The nth optical transceiver can select the m-2nd slot (Tm-2) in a random manner and write the nth unique identification information (SFP n) to the m-2nd slot (Tm-2).

[0090] Referring to the following second cycle (602), among the first to n optical transceivers, the first optical transceiver may randomly select the m-3 slot (Tm-3) and write the first unique identification information (SFP a) to the m-3 slot (Tm-3). The second optical transceiver may randomly select the m-4 slot (Tm-4) and write the second unique identification information (SFP b) to the m-4 slot (Tm-4). The third optical transceiver may randomly select the second slot (T2) and write the third unique identification information (SFP c) to the second slot (T2). The nth optical transceiver may randomly select the second slot (T2) and write the nth unique identification information (SFP n) to the second slot (T2).

[0091] Referring to the first cycle (601) or second cycle (602) described above, when unique identification information is transmitted using a random slot selection method in a time-division multiplexing method, an overlap interval of optical signals corresponding to the unique identification information is inevitable due to probability. However, since the optical signals of the colliding optical transceivers occupy a slot of a different number in the next cycle and are transmitted, the transmission of unique identification information can be successful according to a certain probability.

[0092] Meanwhile, the dedicated receiver (500) can check for errors in the collected information through a Cyclic Redundancy Check (CRC) during the decoding and processing of the received optical signals, and can discard or discard the information of the slot in which the signal is received that has an error caused by signal superposition, etc. The first to nth optical transceivers can divide a certain period into a number of slots sufficiently larger than the number of optical transceivers n in order to successfully transmit an optical signal corresponding to unique identification information.

[0093] For example, when unique identification information is transmitted using a random slot selection method, the transmission success probability according to the number of optical transceivers n and the number of slots m is given by the following mathematical formula 1.

[0094] [Mathematical Formula 1]

[0095] P = (m / m) * ((m-1) / m) * ((m-2) / m) * ... * ((m-n+1) / m)

[0096] Here, P represents the probability that all n optical transceivers select different slots, n represents the number of optical transceivers, and m represents the number of slots.

[0097] FIG. 7 is a diagram showing an example of signal transmission switching of optical transceivers according to an embodiment of the present invention.

[0098] Referring to FIGS. 1 to 7, the first to n optical transceivers (e.g., the first to fourth optical transceivers (201, 202, 203, 204) of FIG. 1 or the fifth to eighth optical transceivers (205, 206, 207, 208)) can be operated in a normal transmission mode in the 701 state. Referring to FIG. 1, the first to n optical transceivers can convert data transmitted by a host device (e.g., first to fourth wireless base station devices (101, 102, 103, 104) or first to fourth digital signal devices (105, 106, 107, 108)) into a signal of a specified wavelength, and transmit the converted signal of the wavelength to a transmission line (400) through a wavelength separation unit (e.g., first wavelength separation unit (301) or second wavelength separation unit (302)). Meanwhile, the first to n optical transceivers can measure the strength of the optical signal received through a receiving circuit (230) at a regular period or in real time. When the first to nth optical transceivers reach a first state (S1) where the intensity of the optical signal is below a preset level (or a state where the intensity of the optical signal is maintained below a preset level for a preset n seconds or longer), they determine that an abnormal situation has occurred and can operate a unique identification number transmission mode as in the 703 state.

[0099] In state 703, the first to nth optical transceivers may stop data transmission of the host device and transmit each preset unique identification number. Here, the first to nth optical transceivers may transmit a message to the host device notifying it of a failure in the transmission line (400). Referring to FIG. 2, the first to nth optical transceivers may notify the host device of the failure through the LOS port. While repeatedly transmitting the unique identification number according to a certain period, the first to nth optical transceivers may detect the optical intensity of the signal received through the receiving circuit (230). When the first to nth optical transceivers are in a second state (S2) where the optical intensity of the signal received through the receiving circuit (230) is maintained below a certain level, they may continue transmission of each unique identification number according to state 703.

[0100] The first to nth optical transceivers can perform normal transmission mode operation according to the 701 state when the optical intensity of the signal received through the receiving circuit (230) changes to a certain level or higher in the third state (S3). In this process, the first to nth optical transceivers can determine that the optical intensity is maintained at a certain level or higher for n seconds or more and transition to the 701 state. When operating in the 701 state, the first to nth optical transceivers can use the LOS port described in FIG. 2 to guide the host device to resolve the fault and request data transmission from the host device.

[0101] FIG. 8 is a diagram showing an example of an operation method of an optical transceiver that supports signal transmission in a wavelength multiplex optical transmission environment according to an embodiment of the present invention.

[0102] Referring to FIGS. 1 through 8, at least one processor (e.g., control circuit (220)) of an optical transceiver (200) (or at least one of the first to fourth optical transceivers (201, 202, 203, 204) and the fifth to eighth optical transceivers (205, 206, 207, 208)) can control the optical transceiver (200) to perform step 801 based on at least one instruction stored in memory. For example, the control circuit (220) of the optical transceiver (200) can perform normal mode operation in step 801. In this regard, the control circuit (220) may receive data to be transmitted to the counterpart device from a host device (e.g., first to fourth wireless base station devices (101, 102, 103, 104) or first to fourth digital signal devices (105, 106, 107, 108)), convert the received data into an optical signal of a wavelength range specified for the corresponding optical transceiver, and then transmit the converted optical signal to the transmission line (400) through a wavelength separation unit (e.g., first wavelength separation unit (301) or second wavelength separation unit (302)). Additionally, the control circuit (220) may control the transmission of the converted electrical signal to the host device after converting the optical signal received through the receiving circuit (230) of the optical transceiver described in FIG. 2 into an electrical signal. Alternatively, the control circuit (220) may convert the converted electrical signal into a digital signal and transmit the converted digital signal to the host device.

[0103] Along with the execution of the above-described step 801, the control circuit (220) of the optical transceiver (200) may, in step 803, check whether the received optical intensity is below a predefined designated level (or threshold level). The magnitude of the optical intensity at the designated level may be set empirically or statistically. Alternatively, the optical intensity at the designated level may be set as the average value of the intensity of the optical signal received by the receiving circuit (230) in a situation where a fault occurs on the transmission line (400) or a value with a relatively high frequency. If the intensity of the optical signal received through the receiving circuit (230) is greater than or equal to the designated level, the control circuit (220) of the optical transceiver (200) may branch to step 801 and repeat the following operation. The optical transceiver (200) may perform step 803 at a regular interval.

[0104] Meanwhile, in step 803 above, if the intensity of the received optical signal is below a specified level, the control circuit (220) of the optical transceiver (200) may determine the current state to be abnormal in step 805. Alternatively, the control circuit (220) may determine that a failure has occurred. If the control circuit (220) determines that a failure has occurred or an abnormal state, it may notify the host device of the failure using the LOS port.

[0105] Next, the control circuit (220) of the optical transceiver (200) can perform random number generation in step 807. In relation to the random number generation, the control circuit (220) can divide a preset period into m slots to transmit designated unique identification information and randomly select one of the numbers in the divided slots. Alternatively, one number can be selected randomly from m numbers according to preset scheduling information. Next, the control circuit (220) of the optical transceiver (200) can write unique identification information (or unique identification number) into a random slot corresponding to the random number generated in step 809 and transmit it.

[0106] In step 811, the control circuit (220) of the optical transceiver (200) can check whether the fault has been restored. For example, the control circuit (220) can check whether the strength of the optical signal received through the receiving circuit (230) is above a preset level. If the strength of the received optical signal is above a preset level, the control circuit (220) determines that the fault has been restored and branches to step 801 to repeat the operation below. Meanwhile, if the strength of the received optical signal is below a preset level, the control circuit (220) branches to step 805 to determine that it is in an abnormal state and repeats the operation below. In the process described above, the control circuit (220) may determine that the fault has been restored if the optical signal above a preset level is maintained for several seconds or longer.

[0107] FIG. 9 is a diagram showing an example of a dedicated receiver operation method that supports unique identification information processing according to an embodiment of the present invention.

[0108] Referring to FIGS. 1 through 9, a dedicated receiver (500) according to an embodiment of the present invention can be connected to a transmission line (400) described in FIG. 1 in step 901. In this regard, the dedicated receiver (500) includes an optical connector (510), and an administrator or operator can connect the optical connector (510) to a portion of the transmission line (400) where a failure has occurred.

[0109] In response to the connection of the optical connector (510), in step 903, the dedicated receiver (500) can receive unique identification information transmitted through the transmission line (400). Here, a plurality of optical transceivers are connected to the transmission line (400), and the plurality of optical transceivers can operate in an abnormal mode in case of failure. For example, in an abnormal mode, the plurality of optical transceivers can stop the data transmission of the host device and each transmit pre-set unique identification information through the transmission line (400). The unique identification information may include identification information for distinguishing the optical transceivers.

[0110] In step 905, the dedicated receiver (500) can verify whether the received signal is normal. If the received signal has an error, the dedicated receiver (500) can discard the received information in step 907. In this regard, the dedicated receiver (500) can perform an error check (e.g., applying CRC) on the received signal. Meanwhile, the received signal may contain a normal part and an error part, respectively. Accordingly, the dedicated receiver (500) can separately extract the normal part and perform storage and output of unique identification information in step 909. Specifically, as a plurality of optical transceivers randomly select one of a plurality of slots constituting a certain period and writes and transmits unique identification information in the selected random slot, a signal corresponding to unique identification information without errors may be written in a specific slot, and a signal containing errors (or unique identification information superimposed) may be written in another specific slot. The dedicated receiver (500) above can extract error-free normal unique identification information from the received signal and store the extracted unique identification information in memory or output it through a designated output device.

[0111] In step 911, the dedicated receiver (500) can check whether an event related to the termination of the optical line verification operation occurs. The event may include, for example, a process termination request (or input) for the termination of the operator's operation. If no separate termination event occurs, the dedicated receiver (500) branches to step 903 and can repeatedly perform the operation for receiving unique identification information and the following operations.

[0112] Meanwhile, the method according to the embodiment of the present invention described above may be implemented in the form of a program readable through various computer means and recorded on a computer-readable recording medium. Here, the recording medium may include program instructions, data files, data structures, etc., either individually or in combination. The program instructions recorded on the recording medium may be those specifically designed and configured for the present invention, or they may be those known and available to those skilled in the art of computer software. For example, the recording medium includes magnetic media such as hard disks, floppy disks, and magnetic tapes; optical recording media such as CD-ROMs and DVDs; magneto-optical media such as floptical disks; and hardware devices specifically configured to store and execute program instructions, such as ROM, RAM, and flash memory. Examples of program instructions may include machine language wires, such as those generated by a compiler, as well as high-level language wires that can be executed by a computer using an interpreter, etc. Such hardware devices may be configured to operate as one or more software modules to perform the operation of the present invention, and vice versa.

[0113] As explained above, this specification includes details of a plurality of specific embodiments, but these should not be understood as limiting the scope of any invention or claimables, but rather as descriptions of features that may be specific to a specific embodiment of a specific invention.

[0114] In addition, although operations are depicted in the drawings in a specific order, this should not be understood as requiring that such operations be performed in that specific or sequential order or that all depicted operations be performed in order to obtain a desirable result. In certain cases, multitasking and parallel processing may be advantageous. Furthermore, the separation of the various system components of the embodiments described above should not be understood as requiring such separation in all embodiments, and it should be understood that the described program components and systems can generally be integrated together into a single software product or packaged into multiple software products.

[0115] The description provided herein presents the best mode of the invention and offers examples to explain the invention and to enable a person skilled in the art to manufacture and use the invention. The specification thus written is not intended to limit the invention to the specific terms presented. Accordingly, although the invention has been described in detail with reference to the examples above, a person skilled in the art can make modifications, changes, and variations to these examples without departing from the scope of the invention.

[0116] Therefore, the scope of the present invention should not be determined by the described embodiments but by the claims.

[0117] [Explanation of the symbol]

[0118] 10: Signal Transmission System Environment

[0119] 101,102, 103, 104, 105, 106, 107, 108: Host device

[0120] 110: Combo Circuit

[0121] 120: Control circuit

[0122] 130: Receiving circuit

[0123] 140: Transmitting circuit

[0124] 150: Temperature control circuit

[0125] 200, 201, 202, 203, 204, 205, 206, 207, 208: Optical transceiver

[0126] 210: Combo Circuit

[0127] 220: Control circuit

[0128] 230: Receiving circuit

[0129] 240: Transmitting circuit

[0130] 250: Temperature control circuit

[0131] 300: Connector

[0132] 301, 302: Wavelength separation unit

[0133] 400: Transmission line

[0134] 500: Dedicated receiver

[0135] 510: Optical connector

[0136] 520: Photodiode

[0137] 530: Signal processing unit

Claims

1. In an optical transceiver, A transmitting circuit that outputs an optical signal of a first wavelength among a plurality of different wavelengths to a transmission line; A receiving circuit that receives an optical signal transmitted by a counterpart device; A control circuit that controls the receiving circuit and the transmitting circuit; including The above control circuit is, If determined to be an abnormal state, generate a random number, and Select a slot corresponding to the above random number within a fixed period divided into multiple slots, and An optical transceiver characterized by controlling the transmission of first unique identification information by writing it into the selected slot above.

2. In Paragraph 1, The above control circuit is An optical transceiver characterized by being configured to determine an abnormal state when the intensity of an optical signal received through the receiving circuit is below a preset level.

3. In Paragraph 2, The above control circuit is An optical transceiver characterized by generating a new random number at each period while the above abnormal state is maintained, and controlling the transmission by writing the first unique identification information into the slot corresponding to the newly generated random number.

4. In Paragraph 1, The above control circuit is An optical transceiver characterized by determining a normal state when the intensity of an optical signal received through the receiving circuit is above a preset level, stopping the generation of the random number according to the normal state determination, and controlling the output of data received from the host device by converting it into an optical signal of the first wavelength.

5. A method for transmitting a signal in a wavelength multiplex optical transmission environment, A control circuit of an optical transceiver that outputs an optical signal of a first wavelength to a transmission line determines an abnormal state; A step of generating a random number when the above abnormal state is determined; A step of selecting a slot corresponding to the random number within a fixed period divided into multiple slots; A signal transmission method in a wavelength multiplex optical transmission environment, characterized by including the step of writing unique identification information into the selected slot and transmitting it.

6. In Paragraph 5, The step of determining the above abnormal state is, A step of checking whether the intensity of the optical signal received through the receiving circuit of the optical transceiver is below a preset level; A signal transmission method in a wavelength multiplex optical transmission environment, characterized by including the step of determining an abnormal state when the intensity of the received optical signal is below a certain level.

7. In Paragraph 6, The step of generating the above random number is, The method includes the step of generating a new random number every period while the above abnormal state is maintained, The above-mentioned transmission step is, A signal transmission method in a wavelength multiplex optical transmission environment, characterized by including the step of transmitting by writing the unique identification information into a slot corresponding to the new random number.

8. In Paragraph 5, A step of determining a normal state when the intensity of the optical signal received through the receiving circuit is above a preset level; Step of stopping the generation of the random number and receiving data from the host device based on the above normal state determination; A signal transmission method in a wavelength multiplex optical transmission environment, further comprising the step of converting data received from the host device into an optical signal of the first wavelength and outputting it.

9. In Paragraph 5, A signal transmission method in a wavelength multiplex optical transmission environment, characterized in that the number of the plurality of slots is set to be greater than the number of the plurality of optical transceivers transmitting unique identification information through the transmission line.

10. A computer program stored on a computer-readable recording medium, The above computer program is, A computer program comprising instructions for a processor to perform a method according to any one of paragraphs 5 through 9.

11. In an optical transceiver, A transmitting circuit configured such that each of a plurality of terminals outputs an optical signal of the same wavelength to the same transmission line in a point-to-multipoint communication structure based on an optical splitter; A receiving circuit configured to receive an optical signal transmitted by a counterpart device; A control circuit that controls the receiving circuit and the transmitting circuit; including The above control circuit is, If determined to be an abnormal state, generate a random number, and Select a slot corresponding to the above random number within a fixed period divided into multiple slots, and An optical transceiver characterized by being configured to write first unique identification information in the selected slot and transmit it to the counterpart device.

12. A method for transmitting signals in a point-to-multipoint optical transmission environment, A control circuit of an optical transceiver that outputs an optical signal of the same wavelength to a transmission line determines an abnormal state; A step of generating a random number when the above abnormal state is determined; A step of selecting a slot corresponding to the random number within a fixed period divided into multiple slots; and A signal transmission method in a point-to-many optical transmission environment characterized by including the step of writing unique identification information into the selected slot and transmitting it.

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