Network node and optical network

Abstract

The embodiment of the utility model provides a network node and an optical network, and the network node can output optical signals to a first optical fiber and a second optical fiber, so that the network node can detect whether the first optical fiber and the second optical fiber break down or not. In the network node, a first light splitting control signal output by a control circuit to a first light splitting optical switch comprises a first light splitting proportion. The first light splitting optical switch at least divides the first transmission optical signal into a first optical signal transmitted to the first optical fiber and a second optical signal transmitted to the second optical fiber according to a first light splitting proportion. Under the condition that the first optical fiber or the second optical fiber breaks down, the optical power of the first optical signal output by the first light splitting optical switch and the optical power of the second optical signal output by the first light splitting optical switch are not zero. The control circuit determines whether the first optical fiber breaks down according to the first optical power of the first optical signal output by the first optical fiber, and determines whether the second optical fiber breaks down according to the second optical power of the second optical signal output by the second optical fiber.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of optical communication technology, in particular to a network node and an optical network. BACKGROUND

[0002] The optical network comprises a first network node, a second network node and a first optical fiber, the first optical fiber is connected between the first network node and the second network node. The optical signal output by the first network node can be transmitted to the second network node through the first optical fiber. At present, in order to improve the reliability of the optical network and ensure the communication quality between the first network node and the second network node, a second optical fiber is also provided in the optical network, and the second optical fiber is also connected between the first network node and the second network node.

[0003] In the architecture of double transmission and single reception, a splitter is provided in the first network node, the splitter divides the optical signal into a first part of optical signal and a second part of optical signal according to a splitting ratio of 50:50, the first part of optical signal is transmitted to the second network node through the first optical fiber, and the second part of optical signal is transmitted to the second network node through the second optical fiber. The second network node selects to receive the first part of optical signal or the second part of optical signal according to the difference between the optical powers of the first part of optical signal and the second part of optical signal. However, the insertion loss of the splitter is large, which will affect the optical signal-to-noise ratio (OSNR) of the optical signal.

[0004] In order to reduce the insertion loss and improve the OSNR of the optical signal, a structure of double reception and single transmission can be used, the splitter in the first network node is replaced by an optical switch, the optical switch transmits the optical signal to the second network node through the first optical fiber, and when the first optical fiber fails, the optical switch switches the optical signal to the second optical fiber for transmission, so as to ensure that the optical signal can be transmitted to the second network node. However, in the process of transmitting the optical signal to the second network node through the first optical fiber by the optical switch, there is no optical signal transmission in the second optical fiber, and the optical network is difficult to determine whether the second optical fiber fails. If the first optical fiber fails and the optical network switches the optical signal to the second optical fiber for transmission without determining that the second optical fiber also fails, the optical signal cannot be normally transmitted after switching, and the reliability of the optical network is poor. CONTENT OF THE UTILITY MODEL

[0005] Embodiments of the present application provide a network node and an optical network, the network node can output optical signals to the first optical fiber and the second optical fiber, so as to facilitate the network node to detect whether the first optical fiber and the second optical fiber fail.

[0006] In a first aspect, a network node is provided, comprising: a first optical splitter and a control circuit. The first optical splitter is connected with a first optical fiber, and the first optical splitter is also connected with a second optical fiber. The control circuit is configured to output a first splitting control signal to the first optical splitter, the first splitting control signal comprising a first splitting ratio. The first optical splitter is configured to receive a first transmission optical signal, split the first transmission optical signal into at least a first optical signal and a second optical signal according to the first splitting ratio, transmit the first optical signal to the first optical fiber, and transmit the second optical signal to the second optical fiber. The control circuit is further configured to receive a first optical power of the first optical signal output by the first optical fiber, receive a second optical power of the second optical signal output by the second optical fiber, determine whether the first optical fiber has a fault according to the first optical power, and determine whether the second optical fiber has a fault according to the second optical power; and in a case where the first optical fiber or the second optical fiber has a fault, the first optical power of the first optical signal output by the first optical splitter and the second optical power of the second optical signal are not 0. In the network node, in a case where the first optical power of the first optical signal output by the first optical splitter is greater than the second optical power of the second optical signal, it indicates that the network node outputs the second optical signal to the second optical fiber in the process of transmitting the optical signal through the first optical fiber, so as to light up the second optical fiber, and then the second optical fiber can be determined whether to have a fault according to the second optical power of the second optical signal. The control circuit further receives the first optical power of the first optical signal output by the first optical fiber, receives the second optical power of the second optical signal output by the second optical fiber, detects whether the first optical fiber has a fault according to the first optical power, and detects whether the second optical fiber has a fault according to the second optical power. In this way, the control circuit can determine whether the first optical fiber and the second optical fiber have a fault, so that the control circuit can switch the optical signal to the optical fiber that does not have a fault at one time in a case where one of the optical fibers has a fault, thereby improving the reliability of the network node, and further improving the reliability of the optical network. In addition, in the network node, in a case where the first optical fiber or the second optical fiber has a fault, the first optical power of the first optical signal output by the first optical splitter and the second optical power of the second optical signal are not 0, and the first optical fiber or the second optical fiber has the optical signal transmitted, so that the control circuit can determine that the first optical fiber or the second optical fiber returns to normal after the fault of the first optical fiber or the second optical fiber is solved.

[0007] Optionally, the control circuit is further configured to adjust the first splitting ratio so that the optical power of the first optical signal output by the first optical splitter is less than the optical power of the second optical signal in a case where the first optical fiber is determined to be faulty and the second optical fiber is determined to be normal, wherein the optical power of the first optical signal output by the first optical splitter is greater than the optical power of the second optical signal before the first optical fiber is determined to be faulty. In this optional mode, the first optical fiber is a main optical fiber and the second optical fiber is a backup optical fiber before the first optical fiber is determined to be faulty. If the first optical fiber is suddenly determined to be faulty, the control circuit adjusts the first splitting ratio so that the optical power of the first optical signal output by the first optical splitter is less than the optical power of the second optical signal in a case where the first optical fiber is determined to be faulty and the second optical fiber is determined to be normal, and the first optical fiber is used to transmit the optical signal as the main optical fiber. In this case, the first optical splitter still outputs the first optical signal to the first optical fiber, and the optical power of the first optical signal output by the first optical splitter is not 0, so that the control circuit can determine that the first optical fiber is normal after the fault of the first optical fiber is solved.

[0008] Optionally, the control circuit is further configured to adjust the first splitting ratio so that the optical power of the first optical signal output by the first optical splitter is greater than the optical power of the second optical signal in a case where the first optical fiber is determined to be normal. In this optional mode, the first optical fiber is switched to the second optical fiber to transmit the optical signal when the first optical fiber is determined to be faulty, and the network node can switch the optical signal to the first optical fiber to transmit the optical signal after the first optical fiber is determined to be normal, and the network node has the ability to switch the optical signal to the first optical fiber to transmit the optical signal.

[0009] Optionally, the control circuit is further configured to adjust the first splitting ratio according to the second optical power so that the optical power of the second optical signal output by the second optical fiber satisfies an output power threshold range of the second optical fiber. In this optional mode, the first splitting ratio is adjusted so that the optical power of the second optical signal output by the second optical fiber satisfies the output power threshold range of the second optical fiber, which means that the first optical splitter outputs the second optical signal that can just light up the second optical fiber without excessively reducing the optical power of the first optical signal in a case where the first optical fiber outputs the first optical signal.

[0010] Optionally, the network node further comprises a first probe component and a second probe component; the first probe component is connected between the first optical splitter and the first optical fiber, and the second probe component is connected between the first optical splitter and the second optical fiber; the first probe component is configured to detect a third optical power of the first optical signal; the second probe component is configured to detect a fourth optical power of the second optical signal; and the control circuit is further configured to receive the third optical power and the fourth optical power, and determine whether the first optical splitter is faulty according to the third optical power, the fourth optical power and the first splitting ratio. In this optional mode, for example, the first splitting ratio in the first splitting control signal output by the control circuit is 98:2, indicating that the optical power ratio of the first optical signal and the second optical signal output by the first optical splitter is 98:2; then the control circuit determines that the first optical splitter is faulty according to the case that the ratio of the third optical power and the fourth optical power deviates from 98:2 by a large margin, or the control circuit determines that the first optical splitter is not faulty according to the case that the ratio of the third optical power and the fourth optical power tends to 98:2.

[0011] Optionally, the control circuit is further configured to adjust the first splitting ratio according to the fourth optical power, so that the optical power of the second optical signal transmitted to the second optical fiber satisfies the input power threshold range of the second optical fiber. In this optional mode, by adjusting the first splitting ratio, the optical power of the second optical signal transmitted to the second optical fiber satisfies the input power threshold range of the second optical fiber, indicating that the first optical splitter outputs the second optical signal that can just light up the second optical fiber to the second optical fiber in the case of outputting the first optical signal through the first optical fiber, and does not excessively reduce the optical power of the first optical signal.

[0012] Optionally, the network node further comprises a first optical switch and a second optical switch; the first optical switch is connected between the first probe component and the first optical fiber, and the second optical switch is connected between the second probe component and the second optical fiber; the first optical splitter further connects with the third optical fiber through a third optical switch, and further connects with the fourth optical fiber through a fourth optical switch; the first optical switch further connects the second optical splitter with the first optical fiber; the second optical switch further connects the second optical splitter with the second optical fiber; the third optical switch further connects the second optical splitter with the third optical fiber; and the fourth optical switch further connects the second optical splitter with the fourth optical fiber. In this optional mode, the first optical splitter, the first optical switch and the second optical switch are also referred to as optical transmitting devices of plane 1 in the network node, and the first optical fiber and the second optical fiber are also referred to as optical fibers of plane 1; the second optical splitter, the third optical switch and the fourth optical switch are also referred to as optical transmitting devices of plane 2 in the network node, and the third optical fiber and the fourth optical fiber are also referred to as optical fibers of plane 2. The optical signals of plane 1 and plane 2 can be transmitted to another network node, but plane 1 and plane 2 are transmitted to another network node through different paths. The first optical switch, the second optical switch, the third optical switch and the fourth optical switch are arranged to enable plane 1 and plane 2 to interconnect and intercommunicate, and the optical signals output by plane 1 can be transmitted to another network node through the optical fibers of plane 1 or plane 2, and the optical signals output by plane 2 can be transmitted to another network node through the optical fibers of plane 1 or plane 2. The optical signals in plane 1 and plane 2 carry different service data.

[0013] Optionally, the control circuit is further configured to adjust the first splitting ratio according to the fourth optical power and the insertion loss of the second optical switch, so that the optical power of the second optical signal transmitted to the second optical fiber meets the input power threshold range of the second optical fiber.

[0014] Optionally, the network node further comprises a third probe component and a fourth probe component; the third probe component is connected between the first optical switch and the first optical fiber, and the fourth probe component is connected between the second optical switch and the second optical fiber; the third probe component is configured to detect a fifth optical power of the first optical signal; the fourth probe component is configured to detect a sixth optical power of the second optical signal; and the control circuit is further configured to receive the fifth optical power and the sixth optical power, and determine whether the first optical switch fails according to the fifth optical power and the third optical power; and determine whether the second optical switch fails according to the sixth optical power and the fourth optical power.

[0015] Optionally, the control circuit is further configured to adjust the first splitting ratio according to the sixth optical power, so that the optical power of the second optical signal transmitted to the second optical fiber meets the input power threshold range of the second optical fiber.

[0016] Optionally, the network node further comprises a fifth detection component and a sixth detection component, the fifth detection component is connected between the first optical splitter and the third optical switch, and the sixth detection component is connected between the first optical splitter and the fourth optical switch; the fifth detection component and the sixth detection component are respectively used for detecting the optical power of the optical signals output by the first optical splitter.

[0017] Optionally, the second optical splitter is used for outputting the optical signals to the third optical fiber and the fourth optical fiber; the control circuit is used for adjusting the first splitting ratio and outputting a first control signal to the second optical splitter when it is determined that the first optical fiber is faulty, the second optical fiber is faulty, the third optical fiber is not faulty, and the fourth optical fiber is not faulty; the third optical signal is further included in the multiple optical signals split by the first optical splitter from the first transmission optical signal, the optical power of the third optical signal output by the first optical splitter is greater than the optical power of the first optical signal, and the optical power of the third optical signal output by the first optical splitter is greater than the optical power of the second optical signal; the first optical splitter is further used for transmitting the third optical signal to the fourth optical fiber through the fourth optical switch; and the second optical splitter is used for transmitting the second transmission optical signal to the third optical fiber through the third optical switch according to the first control signal. In this optional mode, the control circuit can also control the first optical splitter to transmit the optical signals through the fourth optical fiber when the first optical fiber and the second optical fiber are faulty.

[0018] Optionally, the control circuit is further configured to output a first control signal to the second optical splitter; the second optical splitter is configured to receive the second transmission optical signal, and transmit the second transmission optical signal to the third optical fiber via the third optical switch according to the first control signal; the first transmission optical signal split by the first optical splitter according to the first splitting ratio includes a third optical signal, and the optical power of the first optical signal output by the first optical splitter is greater than the optical power of the third optical signal; the first optical splitter is further configured to transmit the third optical signal to the fourth optical fiber via the fourth optical switch; the control circuit is configured to receive a seventh optical power of the second transmission optical signal output by the third optical fiber and an eighth optical power of the third optical signal output by the fourth optical fiber, determine whether the third optical fiber is faulty according to the seventh optical power, and determine whether the fourth optical fiber is faulty according to the eighth optical power. In this optional mode, the optical power of the second transmission optical signal received by the second optical splitter is small, and it is not suitable to split a part of the second transmission optical signal to the fourth optical fiber, and the optical power of the first transmission optical signal received by the first optical splitter is large, and there is a margin. Therefore, the control circuit controls the first optical splitter to output the second optical signal to the second optical fiber via the second optical switch and output the third optical signal to the fourth optical fiber via the fourth optical switch in the process of transmitting the optical signal via the first optical fiber, so as to light up the second optical fiber and the fourth optical fiber, and then the optical power of the second optical signal can be used to determine whether the second optical fiber is faulty, and the optical power of the third optical signal can be used to determine whether the fourth optical fiber is faulty.

[0019] Optionally, the control circuit is configured to adjust the first splitting ratio so that the optical power of the third optical signal output by the first optical splitter is greater than the optical power of the first optical signal and the optical power of the third optical signal output by the first optical splitter is greater than the optical power of the second optical signal, when it is determined that the first optical fiber is faulty, the second optical fiber is faulty, the third optical fiber is not faulty, and the fourth optical fiber is not faulty. In this optional mode, the control circuit can also control the first optical splitter to transmit the optical signal via the fourth optical fiber when the first optical fiber and the second optical fiber are faulty.

[0020] In a second aspect, an optical network is provided, which includes a first network node, a first optical fiber, a second optical fiber, and a second network node, the first optical fiber is connected between the first network node and the second network node, and the second optical fiber is connected between the first network node and the second network node; the first network node includes the network node of any one of the above-mentioned first aspect.

[0021] The technical effects brought by any possible implementation manner in the second aspect can be referred to the technical effects brought by different implementation manners of the first aspect, which will not be described herein.

[0022] In a third aspect, a network node is provided, which comprises a first receiving optical switch, a seventh detecting component and an eighth detecting component; the first receiving optical switch is connected with a first optical fiber, and is also connected with a second optical fiber; the seventh detecting component is connected between the first receiving optical switch and the first optical fiber, and the eighth detecting component is connected between the first receiving optical switch and the second optical fiber; the seventh detecting component and the eighth detecting component are respectively configured to detect optical power of an optical signal transmitted to the network node through the optical fiber connected therewith, and output the optical power through a monitoring channel of the optical fiber connected therewith.

[0023] Optionally, the network node further comprises a third splitting optical switch, a fourth splitting optical switch and a control circuit; the third splitting optical switch is connected between the seventh detecting component and the first receiving optical switch, and the fourth splitting optical switch is connected between the eighth detecting component and the first receiving optical switch. The first receiving optical switch is further connected with a third optical fiber through a fifth splitting optical switch, and is further connected with a fourth optical fiber through a sixth splitting optical switch; the third splitting optical switch further connects the second receiving optical switch with the third optical fiber, and the fourth splitting optical switch further connects the second receiving optical switch with the fourth optical fiber. The fifth splitting optical switch further connects the second receiving optical switch with the third optical fiber, and the sixth splitting optical switch further connects the second receiving optical switch with the fourth optical fiber. A ninth detecting component is connected between the fifth splitting optical switch and the third optical fiber, and a tenth detecting component is connected between the sixth splitting optical switch and the fourth optical fiber; the ninth detecting component and the tenth detecting component are respectively configured to detect optical power of an optical signal transmitted to the network node through the optical fiber connected therewith, and output the optical power through a monitoring channel of the optical fiber connected therewith. The control circuit is configured to output a fourth splitting control signal to the splitting optical switch connected with the main optical fiber, and the fourth splitting control signal comprises a fourth splitting ratio; and output a fifth splitting control signal to the splitting optical switch connected with the backup optical fiber, and the fifth splitting control signal comprises a fifth splitting ratio. The splitting optical switch connected with the main optical fiber is configured to split the received optical signal into at least a first part of optical signal and a second part of optical signal according to the fourth splitting ratio, the optical power of the first part of optical signal is greater than the optical power of the second part of optical signal, transmit the first part of optical signal to a target receiving optical switch of the first receiving optical switch and the second receiving optical switch, and transmit the second part of optical signal to the other receiving optical switch of the first receiving optical switch and the second receiving optical switch. The splitting optical switch connected with the backup optical fiber is configured to split the received optical signal into at least two parts of optical signal according to the fifth splitting ratio, and transmit the two parts of optical signal to the first receiving optical switch and the second receiving optical switch respectively.

[0024] Optionally, the network node further comprises eleventh, twelfth, thirteenth and fourteenth detection components respectively connected between each of the third, fourth, fifth and sixth optical splitter and the first receiving optical switch. The eleventh, twelfth, thirteenth and fourteenth detection components are arranged close to the first receiving optical switch. The eleventh, twelfth, thirteenth and fourteenth detection components are respectively used to detect the optical power of the optical signal transmitted to the first receiving optical switch. The control circuit is further configured to receive the optical power detected by the eleventh, twelfth, thirteenth and fourteenth detection components, and determine whether a fault occurs between the optical splitter connected to the detection component and the first receiving optical switch according to the optical power detected by the detection component. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 A structure diagram of an optical network according to an embodiment of the present application is shown in FIG. 1.

[0026] Figure 2 A structure diagram of an optical network according to another embodiment of the present application is shown in FIG. 2.

[0027] Figure 3 A structure diagram of an optical network according to another embodiment of the present application is shown in FIG. 3.

[0028] Figure 4 A structure diagram of an optical network according to another embodiment of the present application is shown in FIG. 4.

[0029] Figure 5 A structure diagram of an optical network according to another embodiment of the present application is shown in FIG. 5. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments of the present application.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. In the embodiments of the application, "at least one" means one or more, "multiple" means two or more. "And / or" describes the associated relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can represent the following three cases: A exists alone, A and B exist together, B exists alone, where A and B can be singular or plural. The character " / " generally represents an "or" relationship between the associated objects. "At least one of the following" or similar expressions means any combination of these items, including any combination of single or multiple items. For example, at least one of a, b or c can represent a, b, c, a and b, a and c, b and c, or a, b and c, where a, b and c can be singular or plural. In addition, in the embodiments of the application, "first", "second", and the like do not limit the quantity and order.

[0032] In addition, in the embodiments of the application, the orientation terms such as "upper", "lower", and the like are defined with respect to the orientation in which the components in the drawings are placed. It should be understood that these directional terms are relative concepts, which are used for relative description and clarification, and can be changed accordingly according to the change of the orientation in which the components are placed in the drawings.

[0033] In the embodiments of the application, the words "exemplary" or "for example" are used to mean serving as an example, instance, or illustration. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the application should not be construed as being more preferred or advantageous than other embodiments or designs. Rather, the use of the words "exemplary" or "for example" is intended to present concepts in a concrete manner.

[0034] The embodiments of the application will be described in detail below with reference to the accompanying drawings.

[0035] Referring to Figure 1 As shown in the drawings, the embodiments of the application provide a schematic diagram of an optical network 10, which includes a network node 11, a network node 12, and an optical fiber 13. The network node 11 is also referred to as a first network node, the network node 12 is also referred to as a second network node, and the optical fiber 13 is also referred to as a first optical fiber. In some embodiments, the optical fiber 13 is also referred to as a main path optical fiber. The optical fiber 13 is connected between the network node 11 and the network node 12, and the optical signal output by the network node 11 can be transmitted to the network node 12 through the optical fiber 13.

[0036] Currently, to improve the reliability of the optical network 10 and ensure the communication quality between network node 11 and network node 12, an optical fiber 14 is also provided in the optical network 10. The optical fiber 14 is also referred to as a second optical fiber. In some embodiments, the optical fiber 14 is also referred to as a backup optical fiber. The optical fiber 14 is also connected between network node 11 and network node 12.

[0037] like Figure 1 As shown in (a), in the dual-transmitter selective-receiver structure, network node 11 is equipped with a beam splitter 110, and network node 12 is equipped with an optical switch 120. The b-end of beam splitter 110 and the e-end of optical switch 120 are connected via optical fiber 13, and the c-end of beam splitter 110 and the f-end of optical switch 120 are connected via optical fiber 14. Beam splitter 110 splits the optical signal received at the a-end of beam splitter 110 into a first part and a second part of the optical signal according to a 50:50 splitting ratio. The first part of the optical signal is transmitted to network node 12 via optical fiber 13, and the second part of the optical signal is transmitted to network node 12 via optical fiber 14. Network node 12 selects to receive either the first or second optical signal based on the optical power difference between the first and second optical signals. For example, if the optical power difference between the first and second optical signals is greater than or equal to a threshold, network node 12 turns on the e and d terminals of optical switch 120 to receive the first optical signal; if the optical power difference between the first and second optical signals is less than the threshold, network node 12 turns on the f and d terminals of optical switch 120 to receive the second optical signal. Figure 1 In network node 11 shown in (a), the insertion loss of optical splitter 110 is relatively large, about 3.5dB, which will affect the optical signal-to-noise ratio (OSNR) of the first part of the optical signal and the second part of the optical signal.

[0038] To reduce insertion loss and improve the OSNR of the optical signal, a selective transmit / receive architecture can be used, as described above. Figure 1 As shown in (b) above, in network node 11, the optical splitter 110 is replaced with an optical switch 111. The insertion loss of the optical switch is approximately 1 dB. Figure 1As shown in (b) of FIG. 1, the g end of the optical switch 111 is connected with the e end of the optical switch 120 through the optical fiber 13, and the k end of the optical switch 111 is connected with the f end of the optical switch 120 through the optical fiber 14. In the case that the optical signal output by the network node 11 is transmitted to the network node 12 through the optical fiber 13, the optical network 10 controls the h end of the optical switch 111 to be conductive with the g end of the optical switch 111, and controls the e end of the optical switch 120 to be conductive with the d end of the optical switch 120. In the case that the optical signal output by the network node 11 is transmitted to the network node 12 through the optical fiber 14, the optical network 10 controls the h end of the optical switch 111 to be conductive with the k end of the optical switch 111, and controls the f end of the optical switch 120 to be conductive with the d end of the optical switch 120.

[0039] However, in the case that the optical network 10 transmits the optical signal through the optical fiber 13 in (b) of FIG. 1, there is no optical signal transmission in the optical fiber 14, and the optical network 10 is difficult to determine whether the optical fiber 14 is faulty. If the optical fiber 13 is faulty, and the optical network 10 transmits the optical signal output by the network node 11 to the optical fiber 14 without determining that the optical fiber 14 is also faulty, the optical signal cannot be normally transmitted after the switching, and the reliability of the optical network 10 is poor. Figure 1 Therefore, embodiments of the present application provide a network node which can output an optical signal to a first optical fiber and a second optical fiber, so as to facilitate the network node to detect whether the first optical fiber and the second optical fiber are faulty.

[0040] For example, referring to FIG. 2, the network node 21 includes a first optical splitter 211 and a control circuit 212. The first optical splitter 211 is also referred to as a first optical splitter. The first optical splitter 211 is connected with the optical fiber 23, and is also connected with the optical fiber 24. Specifically, in (b) of FIG. 2, the first output end of the first optical splitter 211 is connected with the optical fiber 23, and the second output end of the first optical splitter 211 is connected with the optical fiber 24.

[0041] Figure 2 As shown in (b) of FIG. 2, the g end of the optical switch 111 is connected with the e end of the optical switch 120 through the optical fiber 13, and the k end of the optical switch 111 is connected with the f end of the optical switch 120 through the optical fiber 14. In the case that the optical signal output by the network node 11 is transmitted to the network node 12 through the optical fiber 13, the optical network 10 controls the h end of the optical switch 111 to be conductive with the g end of the optical switch 111, and controls the e end of the optical switch 120 to be conductive with the d end of the optical switch 120. In the case that the optical signal output by the network node 11 is transmitted to the network node 12 through the optical fiber 14, the optical network 10 controls the h end of the optical switch 111 to be conductive with the k end of the optical switch 111, and controls the f end of the optical switch 120 to be conductive with the d end of the optical switch 120. Figure 2 As shown in FIG. 3, the network node 21 includes a first optical splitter 211 and a control circuit 212. The first optical splitter 211 is also referred to as a first optical splitter. The first optical splitter 211 is connected with the optical fiber 23, and is also connected with the optical fiber 24. Specifically, in (b) of FIG. 3, the first output end of the first optical splitter 211 is connected with the optical fiber 23, and the second output end of the first optical splitter 211 is connected with the optical fiber 24.

[0042] The optical fiber 23 is connected between the network node 21 and the network node 22, and the optical fiber 24 is connected between the network node 21 and the network node 22.

[0043] For example, referring to FIG. 2, the network node 21 includes a first optical splitter 211 and a control circuit 212. The first optical splitter 211 is also referred to as a first optical splitter. The first optical splitter 211 is connected with the optical fiber 23, and is also connected with the optical fiber 24. Specifically, in (b) of FIG. 2, the first output end of the first optical splitter 211 is connected with the optical fiber 23, and the second output end of the first optical splitter 211 is connected with the optical fiber 24. Figure 2 Figure 2 As shown in (b) of FIG. 2, the g end of the optical switch 111 is connected with the e end of the optical switch 120 through the optical fiber 13, and the k end of the optical switch 111 is connected with the f end of the optical switch 120 through the optical fiber 14. In the case that the optical signal output by the network node 11 is transmitted to the network node 12 through the optical fiber 13, the optical network 10 controls the h end of the optical switch 111 to be conductive with the g end of the optical switch 111, and controls the e end of the optical switch 120 to be conductive with the d end of the optical switch 120. In the case that the optical signal output by the network node 11 is transmitted to the network node 12 through the optical fiber 14, the optical network 10 controls the h end of the optical switch 111 to be conductive with the k end of the optical switch 111, and controls the f end of the optical switch 120 to be conductive with the d end of the optical switch 120.

[0044] ​​The control circuit 212 is configured to output a first splitting control signal Scon1 to the optical splitter 211, the first splitting control signal Scon1 comprising a first splitting ratio.

[0045] For example, the first splitting ratio in the first splitting control signal Scon1 determines the optical power of the first optical signal O1 and the second optical signal O2 output by the optical splitter 211. In some embodiments, the first splitting ratio can be 98:2, indicating that the optical power ratio of the first optical signal O1 and the second optical signal O2 output by the optical splitter 211 is 98:2, and the optical power of the first optical signal O1 output by the optical splitter 211 is greater than that of the second optical signal O2. In other embodiments, the first splitting ratio can be 95:5, indicating that the optical power ratio of the first optical signal O1 and the second optical signal O2 output by the optical splitter 211 is 95:5, and the optical power of the first optical signal O1 output by the optical splitter 211 is greater than that of the second optical signal O2. The first splitting control signal Scon1 is a voltage signal, the amplitude of the first splitting control signal Scon1 corresponds to the first splitting ratio, and the correspondence between the amplitude of the first splitting control signal Scon1 and the first splitting ratio can be pre-stored in the control circuit 212. The amplitude of the first splitting control signal Scon1 output by the control circuit 212 can be adjusted according to actual needs, thereby adjusting the optical power of the first optical signal O1 and the second optical signal O2 output by the optical splitter 211. For example, the optical splitter 211 comprises any one of a micro-ring modulator and a mach-zehnder (MZ) modulator. The micro-ring modulator and the MZ modulator can both adjust the optical power of the first optical signal O1 and the second optical signal O2 output according to the amplitude of the received first splitting control signal Scon1.

[0046] For example, when the optical power of the first optical signal O1 output by the optical splitter 211 is greater than that of the second optical signal O2, it indicates that the optical fiber 23 is a main optical fiber and the optical fiber 24 is a backup optical fiber, the network node 21 transmits optical signals through the optical fiber 23, and the second optical signal O2 output by the optical splitter 211 can light up the optical fiber 24, thereby determining whether the optical fiber 24 is faulty according to the optical power of the second optical signal O2.

[0047] Reference Figure 2As shown, the control circuit 212 is also used to receive the first optical power P1 of the first optical signal O1 output by the optical fiber 23, receive the second optical power P2 of the second optical signal O2 output by the optical fiber 24, detect whether the optical fiber 23 has a fault based on the first optical power P1, and detect whether the optical fiber 24 has a fault based on the second optical power P2.

[0048] For example, fiber 23 is the main optical fiber, and fiber 24 is the backup optical fiber. Control circuit 212 controls the splitter switch 211 to output a first optical signal O1 to fiber 23. Control circuit 212 determines that fiber 23 is faulty and damaged if the first optical power P1 of the first optical signal O1 output by fiber 23 is less than or equal to the damage threshold; or, control circuit 212 determines that fiber 23 is normal if the first optical power P1 of the first optical signal O1 output by fiber 23 is greater than the damage threshold; or, control circuit 212 determines that fiber 23 is faulty and broken if the first optical power P1 of the first optical signal O1 output by fiber 23 is 0. Control circuit 212 controls optical splitter 211 to output a second optical signal O2 to optical fiber 24. Control circuit 212 calculates the performance parameter value of optical fiber 24, such as the OSNR value of optical fiber 24, based on the difference between the second optical power P2 of the second optical signal O2 output from optical fiber 24 and the optical power of the second optical signal transmitted to optical fiber 24. Based on the performance parameter value of optical fiber 24 and the performance parameter threshold, it makes a judgment to determine whether optical fiber 24 is faulty. For example, if the performance parameter value of optical fiber 24 is less than or equal to the performance parameter threshold, it is determined that optical fiber 24 is faulty. If the performance parameter value of optical fiber 24 is greater than the performance parameter threshold, it is determined that optical fiber 24 is normal.

[0049] The first damage threshold is the difference between the optical power of the detected first optical signal and the change threshold when the first beam splitting ratio remains constant. The change threshold is related to the tolerance performance of the optical network 20 and can be adjusted according to the performance of the optical network 20.

[0050] exist Figure 2 In the network node 20 shown, if the optical fiber 24 fails, the optical splitter switch 211 will still output a second optical signal to the optical fiber 24, and the optical power of the second optical signal O2 output by the optical splitter switch 211 will not be 0, so that the control circuit 212 can determine that the optical fiber 24 has returned to normal after the failure of the optical fiber 24 is resolved.

[0051] In the case that the optical fiber 23 is the main optical fiber and the optical fiber 24 is the backup optical fiber, if the optical fiber 23 suddenly fails, the control circuit 212 is further configured to, in the case that it is determined that the optical fiber 23 fails and the optical fiber 24 is normal, adjust the first splitting ratio so that the optical power of the first optical signal O1 output by the optical splitter 211 is less than the optical power of the second optical signal O2, and transmit the optical signal by the optical fiber 24 as the main optical fiber. In this case, the optical splitter 211 still outputs the first optical signal O1 to the optical fiber 23, and the optical power of the first optical signal O1 output by the optical splitter 211 is not 0, and the optical power of the first optical signal O1 output by the optical splitter 211 satisfies the condition of lighting the optical fiber 23, so that the control circuit 212 can determine that the optical fiber 23 returns to normal after the failure of the optical fiber 23 is solved. The condition of lighting the optical fiber 23 is that, in the case that the optical fiber 23 is normal, the optical power of the first optical signal O1 transmitted to the optical fiber 23 satisfies the input power threshold range of the optical fiber 23, and the optical power of the first optical signal O1 output by the optical fiber 23 satisfies the output power threshold range of the optical fiber 23.

[0052] In the process of transmitting the optical signal by the optical fiber 24 as the main optical fiber, if the failure of the optical fiber 23 is solved, the control circuit 212 is further configured to, in the case that it is determined that the optical fiber 23 returns to normal, adjust the first splitting ratio so that the optical power of the first optical signal O1 output by the optical splitter 211 is greater than the optical power of the second optical signal O2. In the network node 21, the optical signal is switched to be transmitted in the optical fiber 24 when the optical fiber 23 fails, and the network node 21 can also switch the optical signal to be transmitted in the optical fiber 23 after the optical fiber 23 returns to normal, and the network node 21 has the ability of switching recovery.

[0053] In the network node 21, the control circuit 212 outputs a first splitting control signal Scon1 to the optical splitter 211, the first splitting control signal Scon1 including a first splitting ratio; the optical splitter 211 splits the transmission optical signal Oin1 into at least a first optical signal and a second optical signal according to the first splitting ratio, transmits the first optical signal O1 to the optical fiber 23, and transmits the second optical signal O2 to the optical fiber 24. The optical power of the first optical signal O1 output by the optical splitter 211 is greater than the optical power of the second optical signal O2, indicating that the network node 21 outputs the second optical signal O2 to the optical fiber 24 in the process of transmitting the optical signal through the optical fiber 23, so as to light up the optical fiber 24, and further to detect whether the optical fiber 24 is faulty through the second optical signal O2. The control circuit 212 further receives a first optical power P1 of the first optical signal O1 output by the optical fiber 23 and a second optical power P2 of the second optical signal O2 output by the optical fiber 24, detects whether the optical fiber 23 is faulty according to the first optical power P1, and detects whether the optical fiber 24 is faulty according to the second optical power P2. In this way, the control circuit 212 can determine whether the optical fiber 23 and the optical fiber 24 are faulty, so that the control circuit 212 can switch the optical signal to the optical fiber without fault at one time in the case that one optical fiber is faulty, thereby improving the reliability of the network node 21 and further improving the reliability of the optical network 20. In addition, in the network node 21, in the case that the optical fiber 23 or the optical fiber 24 is faulty, the optical power of the first optical signal O1 output by the optical splitter 211 and the optical power of the second optical signal O2 are not 0, and the optical fiber 23 or the optical fiber 24 has the optical signal transmitted, so that the control circuit 212 can determine that the optical fiber 23 or the optical fiber 24 returns to normal after the fault of the optical fiber 23 or the optical fiber 24 is solved.

[0054] In some embodiments, the control circuit 212 is further configured to adjust the first splitting ratio in the first splitting control signal Scon1 according to the second optical power P2, so that the optical power of the second optical signal O2 output by the optical fiber 24 satisfies an output power threshold range of the optical fiber 24.

[0055] For example, in the process that the optical network 20 starts to transmit the optical signal, or in the case that the optical signal transmitted by the optical network is mutated, the optical splitter 211 outputs the first optical signal O1 and the second optical signal O2 according to the preset first splitting ratio, and the optical fiber 23 is the main optical fiber, and the optical power of the first optical signal O1 output by the optical splitter 211 is greater than the optical power of the second optical signal O2. In this scenario, the control circuit 212 adjusts the first splitting ratio in the first splitting control signal Scon1 according to the second optical power P2, so that the optical power of the second optical signal O2 output by the optical fiber 24 satisfies the output power threshold range of the optical fiber 24.

[0056] The principle for adjusting the first splitting ratio is as follows: If the second optical power P2 is less than the minimum value of the output power threshold range of fiber 24, it may be impossible to detect the second optical power P2 of the second optical signal O2 output by fiber 24, and it may also be impossible to determine whether fiber 24 is faulty based on the second optical power P2. Therefore, it is necessary to adjust the first splitting ratio in the first splitting control signal Scon1, reducing the optical power of the first optical signal O1 output by the splitting optical switch 211 and increasing the optical power of the second optical signal O2 output by the splitting optical switch 211, so that the optical power of the second optical signal O2 output by fiber 24 meets the output power threshold range of fiber 24. However, it is not necessary for the optical power of the second optical signal O2 output by the splitting optical switch 211 to be too large, because if the optical power of the second optical signal O2 output by the splitting optical switch 211 increases, the optical power of the first optical signal O1 output by the splitting optical switch 211 will decrease. When network node 21 is currently outputting optical signals through fiber 23, it is necessary to ensure that the optical power of the first optical signal O1 output by the splitting optical switch 211 is as large as possible. Therefore, when the second optical power P2 is greater than the maximum value of the output power threshold range of optical fiber 24, the first splitting ratio in the first splitting control signal Scon1 is adjusted to increase the optical power of the first optical signal O1 output by the splitting optical switch 211 and decrease the optical power of the second optical signal O2 output by the splitting optical switch 211, so that the optical power of the second optical signal O2 output by optical fiber 24 meets the output power threshold range of optical fiber 24.

[0057] The output power threshold range of optical fiber 24 is determined by the threshold, variation threshold, and accuracy range of the receiving device that receives the second optical signal O2. For example, if the receiving device that receives the second optical signal O2 is an optical amplifier, the output power threshold range of optical fiber 24 is equal to the loss of signal (LOS) threshold of the optical amplifier + tolerance error ± accuracy range. The tolerance error of optical fiber 24 is adjustable.

[0058] In some embodiments, refer to Figure 2 As shown, network node 21 also includes detection component D11 and detection component D12. Detection component D11 is also referred to as the first detection component, and detection component D12 is also referred to as the second detection component. Detection component D11 is connected between the optical splitter switch 211 and the optical fiber 23, and detection component D12 is connected between the optical splitter switch 211 and the optical fiber 24. Specifically, the first output terminal of the optical splitter switch 211 is connected to the input terminal of the detection component D11, the output terminal of the detection component D11 is connected to the optical fiber 23, the second output terminal of the optical splitter switch 211 is connected to the input terminal of the detection component D12, and the output terminal of the detection component D12 is connected to the optical fiber 24.

[0059] The detection component D11 is used to detect the third optical power P3 of the first optical signal O1.

[0060] a detection component D12 for detecting a fourth optical power P4 of the second optical signal O2.

[0061] The control circuit 212 is further configured to receive the third optical power P3 and the fourth optical power P4, and determine whether the optical splitter 211 is faulty according to the third optical power P3, the fourth optical power P4 and the first splitting ratio. For example, the first splitting ratio in the first splitting control signal Scon1 output by the control circuit 212 is 98:2, which means that the ratio of the optical power of the first optical signal O1 to the second optical signal O2 output by the optical splitter 211 is 98:2. Then, the control circuit 212 determines that the optical splitter 211 is faulty according to the case that the ratio of the third optical power P3 to the fourth optical power P4 deviates from 98:2 by a large margin, or determines that the optical splitter 211 is not faulty according to the case that the ratio of the third optical power P3 to the fourth optical power P4 tends to 98:2.

[0062] For example, the detection component D11 includes a splitter and a photoelectric detector (PD). The splitter is configured to receive the first optical signal O1 transmitted to the detection component D11, transmit part of the first optical signal O1 to the PD, and output the other part of the first optical signal O1. The PD is configured to detect the optical power of the part of the first optical signal O1. The control circuit 212 can receive the optical power of the part of the first optical signal O1 detected by the PD, and obtain the ratio of the part of the first optical signal O1 to the other part of the first optical signal O1. Therefore, the control circuit 212 can determine the third optical power P3 of the first optical signal O1 output by the detection component D11.

[0063] In other embodiments, the detection component D11 is a tap-photoelectric detector (TAP-PD). The TAP-PD is configured to transmit part of the first optical signal O1 received by the TAP-PD to the PD, and output the other part of the first optical signal O1. The PD is configured to detect the optical power of the part of the first optical signal O1. The control circuit 212 can receive the optical power of the part of the first optical signal O1 detected by the PD, and obtain the ratio of the part of the first optical signal O1 to the other part of the first optical signal O1. Therefore, the control circuit 212 can determine the third optical power P3 of the first optical signal O1 output by the detection component D11.

[0064] The detection component D12 includes a splitter and a photoelectric detector, or the detection component D12 is a tap-photoelectric detector.

[0065] For example, in a case that the control circuit 212 receives the third optical power P3 and the fourth optical power P4, the control circuit 212 is further configured to adjust the first splitting ratio according to the fourth optical power P4, so that the optical power of the second optical signal O2 transmitted to the optical fiber 24 satisfies the input power threshold range of the optical fiber 24.

[0066] For example, in a case that the control circuit 212 receives the third optical power P3 and the fourth optical power P4, the control circuit 212 is further configured to adjust the first splitting ratio according to the fourth optical power P4, so that the optical power of the second optical signal O2 transmitted to the optical fiber 24 satisfies the input power threshold range of the optical fiber 24.

[0067] The principle of adjusting the first splitting ratio is as follows: if the fourth optical power P4 is less than the minimum value of the input power threshold range of the optical fiber 24, it may cause the optical fiber 24 to be unable to normally transmit the second optical signal O2, and thus it is necessary to adjust the first splitting ratio in the first splitting control signal Scon1, to reduce the optical power of the first optical signal O1 output by the optical splitter 211 and increase the optical power of the second optical signal O2 output by the optical splitter 211, so that the optical power of the second optical signal O2 transmitted to the optical fiber 24 satisfies the input power threshold range of the optical fiber 24. However, it is also not necessary for the optical power of the second optical signal O2 output by the optical splitter 211 to be too large, because the optical power of the second optical signal O2 output by the optical splitter 211 becomes larger, the optical power of the first optical signal O1 output by the optical splitter 211 will become smaller, and in a case that the network node 21 currently outputs optical signals through the optical fiber 23, it is necessary to try to ensure that the optical power of the first optical signal O1 output by the optical splitter 211 is larger. If the fourth optical power P4 is greater than the maximum value of the input power threshold range of the optical fiber 24, it is necessary to adjust the first splitting ratio in the first splitting control signal Scon1, to increase the optical power of the first optical signal O1 output by the optical splitter 211 and reduce the optical power of the second optical signal O2 output by the optical splitter 211, so that the optical power of the second optical signal O2 transmitted to the optical fiber 24 satisfies the input power threshold range of the optical fiber 24.

[0068] The input power threshold range of the optical fiber 24 is determined by the minimum value of the input power of the optical fiber 24 and the accuracy range, and specifically, the minimum value of the input power of the optical fiber 24 ± the accuracy range is the input power threshold range of the optical fiber 24.

[0069] The control circuit 212 adjusts the first splitting ratio in the first splitting control signal Sconl according to the second optical power P2 so that the second optical signal O2 output by the optical fiber 24 has an optical power that satisfies the output power threshold range of the optical fiber 24, and adjusts the first splitting ratio according to the fourth optical power P4 so that the second optical signal O2 transmitted to the optical fiber 24 has an optical power that satisfies the input power threshold range of the optical fiber 24. This is to enable the second optical signal output by the optical splitter 211 to light up the optical fiber 24 when the optical fiber 23 is the main path optical fiber.

[0070] In addition, when the optical fiber 23 is the main path optical fiber and the optical fiber 24 is the standby path optical fiber, the input power threshold range of the optical fiber 23 and the output power threshold range of the optical fiber 23 can be determined by the third optical power P3 detected by the detection assembly D11 before the failure of the optical fiber 23 and the first optical power PI detected by the detection assembly D21.

[0071] For example, as shown in Figure 2 The control circuit 212 can receive the first optical power PI and the second optical power P2 because the optical network 20 further includes a network node 22, which is also referred to as a second network node. The network node 22 includes a receiving optical switch 221, a detection assembly D21, and a detection assembly D22. The receiving optical switch 221 is also referred to as a first receiving optical switch, and the detection assembly D21 is also referred to as a seventh detection assembly, and the detection assembly D22 is also referred to as an eighth detection assembly.

[0072] As shown in Figure 2 The receiving optical switch 221 is connected to the optical fiber 23 and is further connected to the optical fiber 24. The detection assembly D21 is connected between the receiving optical switch 221 and the optical fiber 23, and the detection assembly D22 is connected between the receiving optical switch 221 and the optical fiber 24. Specifically, the optical fiber 23 is connected to the input end of the detection assembly D21, the output end of the detection assembly D21 is connected to the first input end of the receiving optical switch 221, the optical fiber 24 is connected to the input end of the detection assembly D22, and the output end of the detection assembly D22 is connected to the second input end of the receiving optical switch 221.

[0073] The detection assembly D21 is configured to detect the first optical power PI of the first optical signal O1 transmitted to the network node 22 through the optical fiber 23 and transmit the first optical power PI to the control circuit 212 in the network node 21 through the monitoring channel of the optical fiber 23.

[0074] The detection assembly D21 is configured to detect the second optical power P2 of the second optical signal O2 transmitted to the network node 22 through the optical fiber 24 and transmit the second optical power P2 to the control circuit 212 in the network node 21 through the monitoring channel of the optical fiber 24.

[0075] For example, each optical fiber is equipped with a monitoring channel for transmitting electrical signals. Therefore, the first optical power P1 detected by the detection component D21 can be transmitted to the control circuit 212 in the network node 21 through the monitoring channel of the optical fiber 23, and the second optical power P2 detected by the detection component D22 can be transmitted to the control circuit 212 in the network node 21 through the monitoring channel of the optical fiber 24.

[0076] exist Figure 2 In the example, when fiber 23 is the main optical fiber, the receiving optical switch 221 is used to receive the first optical signal O1 transmitted to the network node 22 through fiber 23 and output the first optical signal O1.

[0077] In the case where fiber optic cable 24 is the main optical fiber, optical receiving switch 221 is used to receive the second optical signal O2 transmitted to network node 22 through fiber optic cable 24 and output the second optical signal O2.

[0078] Figure 3 The optical signal shown is transmitted from network node 21 to network node 22. In some embodiments, refer to... Figure 2 As shown, in Figure 3 Based on the optical network 20 shown, Figure 3 The optical network 20 shown not only has optical signals transmitted from network node 21 to network node 22, but also optical signals transmitted from network node 22 to network node 21. Figure 3 The network node 21 shown can both receive and output optical signals. Figure 3 The network node 22 shown can both receive and output optical signals.

[0079] like Figure 3 As shown, Figure 2 The network node 22 shown is compared to Figure 3 The network node 22 shown also includes a beam splitter switch 222 and a control circuit 223. Figure 2 The network node 21 shown is compared to Figure 3 The network node 21 shown also includes a receiving optical switch 212, a detection component D31, and a detection component D32.

[0080] Reference Figure 3 As shown, the optical splitter 222 in network node 22 is connected to optical fiber 25, and the optical splitter 222 in network node 22 is also connected to optical fiber 26. The receiving optical switch 213 in network node 21 is connected to optical fiber 25, and the receiving optical switch 213 is also connected to optical fiber 26; the detection component D31 is connected between the receiving optical switch 213 and optical fiber 25, and the detection component D32 is connected between the receiving optical switch 213 and optical fiber 26.

[0081] Specifically, the function of the control circuit 223 in network node 22 is similar to that of the control circuit 212 in network node 21, the function of the optical splitter switch 222 in network node 22 is similar to that of the optical splitter switch 211 in network node 21, and the function of the optical receiver switch 213 in network node 21 is similar to that of the optical receiver switch 221 in network node 22.

[0082] For example, the control circuit 223 in network node 22 is used to output a splitting control signal Scon3 to the splitting optical switch 222. The splitting control signal Scon3 includes a third splitting ratio. The splitting optical switch 222 is used to receive the transmission optical signal On3 through its input terminal, and split the transmission optical signal On3 into at least optical signal O6 and optical signal O7 according to the third splitting ratio. The optical signal O6 is transmitted to optical fiber 25, and the optical signal O7 is transmitted to optical fiber 26.

[0083] The detection component D31 in network node 21 is used to detect the optical power P13 of the optical signal O6 transmitted to network node 21 through optical fiber 25, and output the optical power P13 through the monitoring channel of optical fiber 25.

[0084] The detection component D32 in network node 21 is used to detect the optical power P14 of the optical signal O7 transmitted to network node 21 through optical fiber 26, and output the optical power P14 through the monitoring channel of optical fiber 26.

[0085] The control circuit 223 in network node 22 is also used to receive the optical power P13 of the optical signal O6 output by optical fiber 25, receive the optical power P14 of the optical signal O7 output by optical fiber 26, detect whether optical fiber 25 has a fault based on the optical power P13, and detect whether optical fiber 26 has a fault based on the optical power P14.

[0086] exist Figure 3 In the network node 22 shown, in the event of a fault in optical fiber 25 or optical fiber 26, the optical power of optical signal O6 and optical signal O7 output by the optical splitter switch 221 are not zero, so that the control circuit 223 can determine that optical fiber 25 or optical fiber 26 has returned to normal after the fault in optical fiber 25 or optical fiber 26 is resolved.

[0087] With fiber 25 as the primary fiber and fiber 26 as the backup fiber, if fiber 25 suddenly fails, the control circuit 223, upon confirming the failure of fiber 25 and the normal operation of fiber 26, adjusts the third splitting ratio so that the optical power of the optical signal O6 output by the splitter switch 222 is less than the optical power of the optical signal O7, thus using fiber 26 as the primary fiber for optical signal transmission. If the failure of fiber 25 is resolved, the control circuit 223, upon confirming the restoration of normal operation of fiber 25, adjusts the third splitting ratio so that the optical power of the optical signal O6 output by the splitter switch 222 is greater than the optical power of the optical signal O7.

[0088] For example, Figure 3 In the network node 22 shown, the control circuit 223 is also connected to the receiving optical switch 221. When the optical fiber 23 is the main optical fiber, the control circuit 223 controls the receiving optical switch 221 to output the received first optical signal O1; when the optical fiber 24 is the main optical fiber, the control circuit 223 controls the receiving optical switch 221 to output the received second optical signal O2.

[0089] exist Figure 3 In the example, when fiber 25 is the main fiber, optical switch 213 receives optical signal O6 transmitted to network node 21 via fiber 25 and outputs optical signal O6. Alternatively, when fiber 26 is the main fiber, optical switch 213 receives optical signal O7 transmitted to network node 21 via fiber 26 and outputs optical signal O7.

[0090] For example, when fiber 25 is the main fiber, the control circuit 223 in network node 22 is also used to adjust the third splitting ratio in the splitting control signal Scon3 according to the optical power P14, so that the optical power of the optical signal O7 output by fiber 26 meets the output power threshold range of fiber 26.

[0091] For example, refer to Figure 4 As shown, Figure 2 The network node 22 shown may also be equipped with a detection component D41 and a detection component D42. The detection component D41 is connected between the optical splitter switch 22 and the optical fiber 25, and the detection component D42 is connected between the optical splitter switch 22 and the optical fiber 26.

[0092] Detection component D41 is used to detect the optical power P15 of optical signal O6, and detection component D42 is used to detect the optical power P16 of optical signal O7. In this case, the control circuit 223 in network node 22 is also used to receive optical power P15 and optical power P16, and determine whether the splitting optical switch 222 has malfunctioned based on optical power P15, optical power P16, and the third splitting ratio. When fiber 25 is the main fiber, the control circuit 223 is also used to adjust the third splitting ratio according to optical power P16, so that the optical power of optical signal O7 transmitted to fiber 26 meets the input power threshold range of fiber 26.

[0093] In some embodiments, in order to transmit the optical signals received by different optical splitters to optical fiber 23 or optical fiber 24, refer to Figure 4 As shown, compared to Figure 4 Network node 22 shown, Figure 4 The network node 21 shown also includes optical switch 301 and optical switch 302. Optical switch 301 is also referred to as the first optical switch, and optical switch 302 is also referred to as the second optical switch. Optical switch 301 is connected between the detection component D11 and the optical fiber 23, and optical switch 302 is connected between the detection component D12 and the optical fiber 24.

[0094] like Figure 4 As shown, the optical splitter 211 is also connected to optical fiber 27 via optical switch 303, and to optical fiber 28 via optical switch 304. Optical switch 303 is also referred to as the third optical switch, optical switch 304 as the fourth optical switch, optical fiber 27 as the third optical fiber, and optical fiber 28 as the fourth optical fiber.

[0095] Optical switch 301 also connects optical splitter 214 to optical fiber 23; optical switch 302 also connects optical splitter 214 to optical fiber 24. Optical splitter 214 is also referred to as the second optical splitter.

[0096] Optical switch 303 also connects optical splitter switch 214 to optical fiber 27; optical switch 304 also connects optical splitter switch 214 to optical fiber 28.

[0097] exist Figure 4 In the example, optical splitter switches 211, 301, and 302 are also referred to as optical transmitting devices of plane 1 in network node 21, and optical fibers 23 and 24 are also referred to as optical fibers of plane 1; optical splitter switches 214, 303, and 304 are also referred to as optical transmitting devices of plane 2 in network node 21, and optical fibers 27 and 28 are also referred to as optical fibers of plane 2. Optical signals from both plane 1 and plane 2 can be transmitted to... Figure 4The network node 22 is shown, but the plane 1 and the plane 2 are transmitted from the network node 21 to the network node 22 through different paths. In Figure 4 In the network node 21 shown, the optical switch 301, the optical switch 302, the optical switch 304, and the optical switch 303 are configured to interconnect the plane 1 and the plane 2, and the optical signal output by the plane 1 can be transmitted to the network node 22 through the optical fiber of the plane 1 or the plane 2, and the optical signal output by the plane 2 can be transmitted to the network node 22 through the optical fiber of the plane 1 or the plane 2. The optical signals in the plane 1 and the plane 2 carry different service data. The control circuit 212 includes a control circuit deployed in the plane 1 and a control circuit deployed in the plane 2, and the control circuit deployed in the plane 1 and the control circuit deployed in the plane 2 can transmit electrical signals.

[0098] In the network node 21 shown, the optical switch 301, the optical switch 302, the optical switch 304, and the optical switch 303 are configured to interconnect the plane 1 and the plane 2, and the optical signal output by the plane 1 can be transmitted to the network node 22 through the optical fiber of the plane 1 or the plane 2, and the optical signal output by the plane 2 can be transmitted to the network node 22 through the optical fiber of the plane 1 or the plane 2. The optical signals in the plane 1 and the plane 2 carry different service data. The control circuit 212 includes a control circuit deployed in the plane 1 and a control circuit deployed in the plane 2, and the control circuit deployed in the plane 1 and the control circuit deployed in the plane 2 can transmit electrical signals. Figure 4 In the network node 21 shown, the optical switch 301, the optical switch 302, the optical switch 304, and the optical switch 303 are configured to interconnect the plane 1 and the plane 2, and the optical signal output by the plane 1 can be transmitted to the network node 22 through the optical fiber of the plane 1 or the plane 2, and the optical signal output by the plane 2 can be transmitted to the network node 22 through the optical fiber of the plane 1 or the plane 2. The optical signals in the plane 1 and the plane 2 carry different service data. The control circuit 212 includes a control circuit deployed in the plane 1 and a control circuit deployed in the plane 2, and the control circuit deployed in the plane 1 and the control circuit deployed in the plane 2 can transmit electrical signals.

[0099] In the network node 21 shown, the optical switch 301, the optical switch 302, the optical switch 304, and the optical switch 303 are configured to interconnect the plane 1 and the plane 2, and the optical signal output by the plane 1 can be transmitted to the network node 22 through the optical fiber of the plane 1 or the plane 2, and the optical signal output by the plane 2 can be transmitted to the network node 22 through the optical fiber of the plane 1 or the plane 2. The optical signals in the plane 1 and the plane 2 carry different service data. The control circuit 212 includes a control circuit deployed in the plane 1 and a control circuit deployed in the plane 2, and the control circuit deployed in the plane 1 and the control circuit deployed in the plane 2 can transmit electrical signals. Figure 4 In the network node 22 shown, during the process that the optical network 20 starts to transmit the optical signal and the optical fiber 23 is the main optical fiber, the control circuit 212 is configured to receive the third optical power P3 and the fourth optical power P4, and control the control circuit 212 to adjust the first splitting ratio according to the fourth optical power P4 and the insertion loss of the optical switch 302, so that the optical power of the second optical signal O2 transmitted to the optical fiber 24 satisfies the input power threshold range of the optical fiber 24. In this example, the third optical power P3 minus the insertion loss of the optical switch 301 is the optical power of the first optical signal O1 transmitted to the optical fiber 23, and the fourth optical power P4 minus the insertion loss of the optical switch 302 is the optical power of the second optical signal O2 transmitted to the optical fiber 24. When the fourth optical power P4 of the second optical signal O2 minus the insertion loss of the optical switch 302 is less than the minimum value of the input power threshold range of the optical fiber 24, the first splitting ratio in the first splitting control signal Scon1 needs to be adjusted to reduce the optical power of the first optical signal O1 output by the optical splitter 211 and increase the optical power of the second optical signal O2 output by the optical splitter 211; when the fourth optical power P4 of the second optical signal O2 minus the insertion loss of the optical switch 302 is greater than the maximum value of the input power threshold range of the optical fiber 24, the first splitting ratio in the first splitting control signal Scon1 needs to be adjusted to increase the optical power of the first optical signal O1 output by the optical splitter 211 and reduce the optical power of the second optical signal O2 output by the optical splitter 211; and finally make the optical power of the second optical signal O2 transmitted to the optical fiber 24 satisfy the input power range of the optical fiber 24.

[0100] In other embodiments, as Figure 4As shown, the network node 21 further comprises a detection component D51, also referred to as a third detection component, and a detection component D52, also referred to as a fourth detection component. The detection component D51 is connected between the optical switch 301 and the optical fiber 23, and the detection component D52 is connected between the optical switch 302 and the optical fiber 24.

[0101] The detection component D51 is configured to detect a fifth optical power P5 of the first optical signal O1.

[0102] The detection component D52 is configured to detect a sixth optical power P6 of the second optical signal O2.

[0103] The control circuit 212 is further configured to receive the fifth optical power P5 and the sixth optical power P6, and determine whether the optical switch 301 is faulty according to the fifth optical power P5 and the third optical power P3, and determine whether the optical switch 302 is faulty according to the sixth optical power P6 and the fourth optical power P4.

[0104] For example, the control circuit 212 determines that the optical switch 301 is faulty according to a difference between the fifth optical power P5 and the third optical power P3 being greater than or equal to a first threshold value, and determines that the optical switch 301 is normal according to the difference between the fifth optical power P5 and the third optical power P3 being less than the first threshold value, and determines that the optical switch 302 is faulty according to a difference between the sixth optical power P6 and the fourth optical power P4 being greater than or equal to a second threshold value, and determines that the optical switch 302 is normal according to the difference between the sixth optical power P6 and the fourth optical power P4 being less than the second threshold value. The first threshold value can be a sum of a threshold value and a fluctuation value of the optical switch 301, and the second threshold value can be a sum of a threshold value and a fluctuation value of the optical switch 302.

[0105] For example, in a process in which the optical network 20 starts to transmit optical signals and the optical fiber 23 is a main optical fiber, Figure 4 In the network node 21 as shown, the control circuit 212 can receive the third optical power P3 and the fourth optical power P4, and can also receive the fifth optical power P5 and the sixth optical power P6. The control circuit 212 does not need to adjust the first splitting ratio according to the fourth optical power P4 and an insertion loss of the optical switch 302, but adjusts the first splitting ratio according to the sixth optical power P6, so that the optical power of the second optical signal O2 transmitted to the optical fiber 24 satisfies the input power threshold range of the optical fiber 24.

[0106] In the example of Figure 4 In the example of

[0107] Any one of the detection components D11, D12, D13 and D14 is configured to detect the optical power of the optical signal output by the optical splitter 211.

[0108] In the example of Figure 4 , the network node 21 further comprises detection components D15, D16, D17 and D18. The detection component D15 is connected between the optical splitter 214 and the optical switch 301, the detection component D16 is connected between the optical splitter 214 and the optical switch 302, the detection component D17 is connected between the optical splitter 214 and the optical switch 303, and the detection component D18 is connected between the optical splitter 211 and the optical switch 303.

[0109] Any one of the detection components D15, D16, D17 and D18 is configured to detect the optical power of the optical signal output by the optical splitter 214.

[0110] In the example of Figure 4 , the network node 21 further comprises detection components D53 and D54. The detection component D53 is connected between the optical switch 303 and the optical fiber 27, and the detection component D54 is connected between the optical switch 304 and the optical fiber 28.

[0111] The detection component D53 is configured to detect the optical power of the optical signal transmitted to the optical fiber 27.

[0112] The detection component D54 is configured to detect the optical power of the optical signal transmitted to the optical fiber 28.

[0113] Based on the architecture of Figure 5 , a first signal transmission example is that the control circuit 212 is further configured to output a splitting control signal Scon2 to the optical splitter 214, and the splitting control signal Scon2 comprises a second splitting ratio.

[0114] The optical splitter 214 is configured to receive the transmission optical signal Oin2, split the transmission optical signal Oin2 into at least the optical signal O3 and the optical signal O4 according to the second splitting ratio, transmit the optical signal O3 to the optical fiber 27 through the optical switch 303, and transmit the optical signal O4 to the optical fiber 28 through the optical switch 304. It is represented that the optical splitter 214 outputs the optical signal to the optical fiber 27 and outputs the optical signal to the optical fiber 28.

[0115] The control circuit 212 is further configured to receive the optical power P9 of the optical signal O3 output by the optical fiber 27 and the optical power P10 of the optical signal O4 output by the optical fiber 28, determine whether the optical fiber 27 has a fault according to the optical power P9, and determine whether the optical fiber 28 has a fault according to the optical power P10.

[0116] InFigure 4 In the network node 22 shown, in the case of a failure of the optical fiber 27, the optical power of the optical signal O3 output by the optical splitter 214 is not 0, so that after the failure of the optical fiber 27 or the optical fiber 28 is resolved, the control circuit 212 can determine that the optical fiber 27 or the optical fiber 28 returns to normal.

[0117] In the case of the optical fiber 27 being a main path optical fiber and the optical fiber 28 being a backup path optical fiber, if the optical fiber 27 suddenly fails, the control circuit 212 is further configured to, in the case of determining that the optical fiber 27 fails and the optical fiber 28 is normal, adjust the second splitting ratio so that the optical power of the optical signal O3 output by the optical splitter 214 is less than the optical power of the optical signal O4, and use the optical fiber 28 to transmit the optical signal as a main path optical fiber. If the failure of the optical fiber 27 is resolved, the control circuit 212 is further configured to, in the case of determining that the optical fiber 27 returns to normal, adjust the second splitting ratio so that the optical power of the optical signal O3 output by the optical splitter 214 is greater than the optical power of the optical signal O4.

[0118] In the first signal transmission example, the control circuit 212 is further configured to determine whether the optical splitter 214 fails according to the optical power of the optical signal O3 detected by the detection component D17 and the optical power of the optical signal O4 detected by the detection component D18 and the second splitting ratio.

[0119] The control circuit 212 is further configured to determine whether the optical switch 303 fails according to the optical power of the optical signal O3 detected by the detection component D53 and the optical power of the optical signal O3 detected by the detection component D17, and determine whether the optical switch 304 fails according to the optical power of the optical signal O4 detected by the detection component D54 and the optical power of the optical signal O4 detected by the detection component D18.

[0120] The optical power of the optical signal O4 output by the optical splitter 214 needs to meet the condition of lighting the optical fiber 28, and the control circuit 212 is further configured to adjust the second splitting ratio in the second splitting control signal Scon2 according to the optical power P8, so that the optical power of the optical signal O4 output by the optical fiber 28 meets the output power threshold range of the optical fiber 28. The control circuit 212 is further configured to adjust the second splitting ratio according to the optical power of the optical signal O4 detected by the detection component D18 and the insertion loss of the optical switch 304, so that the optical power of the optical signal O4 transmitted to the optical fiber 28 meets the input power threshold range of the optical fiber 28. Alternatively, the control circuit 212 is configured to adjust the second splitting ratio according to the optical power of the optical signal O4 detected by the detection component D54, so that the optical power of the optical signal O4 transmitted to the optical fiber 28 meets the input power threshold range of the optical fiber 28.

[0121] In the first signal transmission example, where fiber 23 in plane 1 is the main fiber and fiber 27 in plane 2 is the main fiber, if both fiber 23 and fiber 24 fail, while fiber 27 and fiber 28 are normal, refer to... Figure 5 As shown, the control circuit 212 is also used to adjust the first splitting ratio and output the first control signal S10 to the splitting switch 214 when it is determined that the optical fiber 23 or the optical fiber 24 is faulty, while the optical fiber 27 and the optical fiber 28 are normal.

[0122] The optical splitter 211 divides the first transmitted optical signal Sn1 into multiple optical signals, including a third optical signal O5, according to the adjusted first splitting ratio. The optical power of the third optical signal O5 output by the optical splitter 211 is greater than the optical power of the first optical signal O1, and greater than the optical power of the second optical signal O2. The optical power of the first optical signal O1 output by the optical splitter 211 is not zero, and its power satisfies the condition for lighting up optical fiber 23, so that the control circuit 212 can determine that optical fiber 23 has returned to normal after the fault in optical fiber 23 is resolved. Similarly, the optical power of the second optical signal O2 output by the optical splitter 211 is not zero, and its power satisfies the condition for lighting up optical fiber 24, so that the control circuit 212 can determine that optical fiber 24 has returned to normal after the fault in optical fiber 24 is resolved.

[0123] The optical splitter 211 is also used to transmit the third optical signal O5 to the optical fiber 28 via the optical switch 304. Plane 1 in network node 21 outputs an optical signal through the optical fiber 28.

[0124] Optical splitter 214 is used to transmit the second transmission optical signal On2 through optical switch 303 to optical fiber 27 according to the first control signal S10. Plane 2 in network node 21 outputs optical signal through optical fiber 27.

[0125] based on Figure 5 The architecture, the second signal transmission example refers to Figure 4 As shown, it can be: a control circuit 212, which is also used to output a first control signal S10 to the optical splitter 214; the optical splitter 214 is used to receive the second transmission optical signal Oin2, and transmit the second transmission optical signal Oin2 to the optical fiber 27 via the optical switch 303 according to the first control signal S10.

[0126] The optical splitter 211 divides the first transmitted optical signal On1 into multiple optical signals according to the first splitting ratio, including a third optical signal O5; the optical splitter 211 is also used to transmit the third optical signal O5 to the optical fiber 28 via the optical switch 304.

[0127] The control circuit 212 is configured to receive the seventh optical power P7 of the second transmission optical signal Oin2 output by the optical fiber 27, receive the eighth optical power P8 of the third optical signal O5 output by the optical fiber 28, determine whether the optical fiber 27 is faulty according to the seventh optical power P7, and determine whether the optical fiber 28 is faulty according to the eighth optical power P8.

[0128] In this example, the optical power of the second transmission optical signal Oin2 received by the optical splitter 214 is small, and it is not suitable to split a part of the transmission optical signal Oin2 to the optical fiber 28, and the optical power of the first transmission optical signal Oin1 received by the optical splitter 211 is large, and there is a margin. Therefore, the control circuit 212 controls the optical splitter 211 to output the second optical signal O2 to the optical fiber 24 through the optical switch 302 and output the third optical signal O5 to the optical fiber 28 through the optical switch 304 in the process of transmitting the optical signal through the optical fiber 23, so as to light the optical fiber 24 and the optical fiber 28. Then, whether the optical fiber 24 is faulty can be determined according to the optical power of the second optical signal O2, and whether the optical fiber 28 is faulty can be determined according to the optical power of the third optical signal O5.

[0129] In Figure 5 In the second signal transmission example shown in FIG. 5, the control circuit 212 is specifically configured to determine whether the optical splitter 211 is faulty according to the third optical power P3, the fourth optical power P4, the optical power of the third optical signal O5 detected by the detection assembly D14, and the first splitting ratio.

[0130] The control circuit 212 is further configured to determine whether the optical switch 304 is faulty according to the optical power of the third optical signal O5 detected by the detection assembly D54 and the optical power of the third optical signal O5 detected by the detection assembly D14.

[0131] The light power of the second optical signal O2 output by the optical splitter 211 needs to meet the condition of lighting the optical fiber 24, and the light power of the third optical signal O5 output by the optical splitter 211 needs to meet the condition of lighting the optical fiber 28. The control circuit 212 is specifically configured to adjust the first splitting ratio in the first splitting control signal Scon1 according to the second light power P2 and the tenth light power P10, so that the light power of the second optical signal O2 output by the optical fiber 24 meets the output power threshold range of the optical fiber 24, and the light power of the third optical signal O5 output by the optical fiber 28 meets the output power threshold range of the optical fiber 28. The control circuit 212 is specifically configured to adjust the first splitting ratio according to the fourth light power P4, the insertion loss of the optical switch 302, the light power of the third optical signal O5 detected by the detection assembly D14, and the insertion loss of the optical switch 304, so that the light power of the second optical signal O2 transmitted to the optical fiber 24 meets the input power threshold range of the optical fiber 24, and the light power of the third optical signal O5 transmitted to the optical fiber 28 meets the input power threshold range of the optical fiber 28. Alternatively, the control circuit 212 is configured to adjust the first splitting ratio according to the sixth light power P6 and the light power of the third optical signal O5 detected by the detection assembly D54, so that the light power of the first optical signal O1 transmitted to the optical fiber 23 meets the input power threshold range of the optical fiber 23, the light power of the second optical signal O2 transmitted to the optical fiber 24 meets the input power threshold range of the optical fiber 24, and the light power of the third optical signal O5 transmitted to the optical fiber 28 meets the input power threshold range of the optical fiber 28.

[0132] In the second signal transmission example, in the case that the optical fiber 23 in the plane 1 is the main route optical fiber, and the optical fiber 27 in the plane 2 is the main route optical fiber, if the optical fiber 23 and the optical fiber 24 both fail, and the optical fiber 27 and the optical fiber 28 are normal, the control circuit 212 is configured to adjust the first splitting ratio to make the light power of the third optical signal O5 output by the optical splitter 211 greater than the light power of the first optical signal O1, and the light power of the third optical signal O5 output by the optical splitter 211 greater than the light power of the second optical signal O2, in the case that it is determined that the optical fiber 23 fails, the optical fiber 24 fails, the optical fiber 27 is normal, and the optical fiber 28 is normal. The plane 1 in the network node 21 outputs the optical signal through the optical fiber 28.

[0133] In the second signal transmission example, in the case that the optical fiber 23 in the plane 1 is the main route optical fiber, and the optical fiber 27 in the plane 2 is the main route optical fiber, if the optical fiber 27 fails, and the optical fiber 23, the optical fiber 24, and the optical fiber 28 are normal, the control circuit 212 is configured to adjust the first splitting ratio and output the second control signal S20 to the optical splitter 214, in the case that it is determined that the optical fiber 23 is normal, the optical fiber 24 is normal, the optical fiber 27 fails, and the optical fiber 28 is normal.

[0134] The first optical signal O1, the second optical signal O2 and the fourth optical signal O8 are included in the plurality of optical signals into which the first transmission optical signal Sin1 is divided by the first splitting optical switch 211 according to the adjusted first splitting ratio, and the third optical signal O5 is not included; and the optical power of the first optical signal O1 output by the first splitting optical switch 211 is greater than the optical power of the second optical signal O2, and the optical power of the first optical signal O1 output by the first splitting optical switch 211 is greater than the optical power of the fourth optical signal O8. The plane 1 in the network node 21 outputs optical signals through the optical fiber 23, the optical power of the second optical signal O2 output by the first splitting optical switch 211 is not 0, and the optical power of the second optical signal O2 output by the first splitting optical switch 211 meets the condition of lighting the optical fiber 24, so that after the fault of the optical fiber 24 is solved, the control circuit 212 can determine that the optical fiber 24 returns to normal. The optical power of the fourth optical signal O8 output by the first splitting optical switch 211 is not 0, and the optical power of the fourth optical signal O8 output by the first splitting optical switch 211 meets the condition of lighting the optical fiber 27, so that after the fault of the optical fiber 27 is solved, the control circuit 212 can determine that the optical fiber 27 returns to normal.

[0135] The first splitting optical switch 211 is also used for transmitting the fourth optical signal O8 to the optical fiber 27 through the optical switch 303.

[0136] The second splitting optical switch 214 is used for transmitting the second transmission optical signal Oin2 to the optical fiber 28 through the optical switch 304 according to the second control signal S20. The plane 2 in the network node 21 outputs optical signals through the optical fiber 28.

[0137] In the second signal transmission example, in the case that the optical fiber 23 in the plane 1 is the main road optical fiber, and the optical fiber 27 in the plane 2 is the main road optical fiber, if the optical fiber 27 fails, the optical fiber 23 fails, and the optical fiber 24 and the optical fiber 28 are normal, the control circuit 212 is used for adjusting the first splitting ratio and outputting the second control signal S20 to the second splitting optical switch 214 in the case that it is determined that the optical fiber 23 fails, the optical fiber 24 is normal, the optical fiber 27 fails, and the optical fiber 28 is normal.

[0138] The first optical signal O1, the second optical signal O2 and the fourth optical signal O8 are included in the plurality of optical signals into which the first transmission optical signal Sin1 is divided by the adjusted first splitting ratio, and the third optical signal O5 is not included; and the optical power of the first optical signal O1 output by the splitting optical switch 211 is less than the optical power of the second optical signal O2, and the optical power of the fourth optical signal O8 output by the splitting optical switch 211 is less than the optical power of the second optical signal O2. The plane 1 in the network node 21 outputs optical signals through the optical fiber 24, the optical power of the first optical signal O1 output by the splitting optical switch 211 is not 0, and the optical power of the first optical signal O1 output by the splitting optical switch 211 satisfies the condition of lighting the optical fiber 23, so that after the fault of the optical fiber 23 is solved, the control circuit 212 can determine that the optical fiber 23 returns to normal. The optical power of the fourth optical signal O8 output by the splitting optical switch 211 is not 0, and the optical power of the fourth optical signal O8 output by the splitting optical switch 211 satisfies the condition of lighting the optical fiber 27, so that after the fault of the optical fiber 27 is solved, the control circuit 212 can determine that the optical fiber 27 returns to normal.

[0139] The splitting optical switch 211 is also used for transmitting the fourth optical signal O8 to the optical fiber 27 through the optical switch 303.

[0140] The splitting optical switch 214 is used for transmitting the second transmission optical signal Oin2 to the optical fiber 28 through the optical switch 304 according to the second control signal S20. The plane 2 in the network node 21 outputs optical signals through the optical fiber 28.

[0141] For example, as shown in Figure 2 or Figure 4 Compared with the network node 22 shown in Figure 5 , the network node 22 shown in Figure 4 or Figure 5 Further includes a splitting optical switch 311 and a splitting optical switch 312, the splitting optical switch 311 is also called a third splitting optical switch, and the splitting optical switch 312 is also called a fourth splitting optical switch. The splitting optical switch 311 is connected between the detection assembly D21 and the receiving optical switch 221, and the splitting optical switch 312 is connected between the detection assembly D22 and the receiving optical switch 221.

[0142] The receiving optical switch 221 is further connected with the optical fiber 27 through a splitting optical switch 313, and is further connected with the optical fiber 28 through a splitting optical switch 314; the splitting optical switch 313 is also called a fifth splitting optical switch, and the splitting optical switch 314 is also called a sixth splitting optical switch.

[0143] The splitting optical switch 311 further connects the receiving optical switch 224 with the optical fiber 23, the splitting optical switch 312 further connects the receiving optical switch 224 with the optical fiber 24, and the receiving optical switch 224 is also called a second receiving optical switch.

[0144] The splitting optical switch 313 also connects the receiving optical switch 224 with the optical fiber 27, and the splitting optical switch 314 also connects the receiving optical switch 224 with the optical fiber 28.

[0145] The control circuit 223 is configured to output a fourth splitting control signal to the splitting optical switch connected with the main path optical fiber, and the fourth splitting control signal comprises a fourth splitting ratio; and output a fifth splitting control signal to the splitting optical switch connected with the backup path optical fiber, and the fifth splitting control signal comprises a fifth splitting ratio.

[0146] The splitting optical switch connected with the main path optical fiber is configured to split the received optical signal into at least a first part of optical signal and a second part of optical signal according to the fourth splitting ratio, the first part of optical signal has a larger optical power than the second part of optical signal, transmit the first part of optical signal to the target receiving optical switch, and transmit the second part of optical signal to other receiving optical switches.

[0147] The splitting optical switch connected with the backup path optical fiber is configured to split the received optical signal into at least two parts of optical signal according to the fifth splitting ratio, and transmit the two parts of optical signal to two receiving optical switches respectively.

[0148] The receiving optical switch 221, the splitting optical switch 311 and the splitting optical switch 312 are also referred to as optical receiving devices of plane 1 in the network node 22; and the receiving optical switch 224, the splitting optical switch 313 and the splitting optical switch 314 are also referred to as optical receiving devices of plane 2 in the network node 22.

[0149] In the network node 22 shown in Figure 4 or Figure 5 In the network node 22 shown in

[0150] In the first signal transmission example shown in Figure 4 The detection component D23 is configured to detect an optical power P9 of the optical signal O3 transmitted to the network node 22 through the optical fiber 27, and transmit the optical power P9 through a monitoring channel of the optical fiber 27 to the control circuit 212 in the network node 21. The detection component D24 is configured to detect an optical power P10 of the optical signal O4 transmitted to the network node 22 through the optical fiber 28, and transmit the optical power P10 through a monitoring channel of the optical fiber 28 to the control circuit 212 in the network node 21.

[0151] In the second signal transmission example shown in Figure 5In the second signal transmission example shown, the detection component D23 is configured to detect the seventh optical power P7 of the second transmission optical signal Oin2 transmitted to the network node 22 through the optical fiber 27, and transmit the seventh optical power P7 through the monitoring channel of the optical fiber 27 to the control circuit 212 in the network node 21. The detection component D24 is configured to detect the eighth optical power P8 of the third optical signal O5 transmitted to the network node 22 through the optical fiber 28, and transmit the eighth optical power P8 through the monitoring channel of the optical fiber 28 to the control circuit 212 in the network node 21.

[0152] With reference to Figure 4 With Figure 5 As shown, the network node 22 further comprises a detection component D61, a detection component D62, a detection component D63, and a detection component D64 connected between each of the optical splitter-combiner 311, the optical splitter-combiner 312, the optical splitter-combiner 313, and the optical splitter-combiner 314 and the receiving optical switch 221, respectively. The detection component D61, the detection component D62, the detection component D63, and the detection component D64 are arranged close to the receiving optical switch 221. The detection component D61 is also referred to as an eleventh detection component, the detection component D62 is also referred to as a twelfth detection component, the detection component D63 is also referred to as a thirteenth detection component, and the detection component D64 is also referred to as a fourteenth detection component.

[0153] In which, the detection component D65, the detection component D66, the detection component D67, and the detection component D68 are arranged between each of the optical splitter-combiner 311, the optical splitter-combiner 312, the optical splitter-combiner 213, and the optical splitter-combiner 314 and the receiving optical switch 224, respectively, and arranged close to the receiving optical switch 221.

[0154] The detection component D61, the detection component D62, the detection component D63, and the detection component D64 are configured to detect the optical power of the optical signal transmitted to the receiving optical switch 221, respectively.

[0155] The detection component D65, the detection component D66, the detection component D67, and the detection component D68 are configured to detect the optical power of the optical signal transmitted to the receiving optical switch 224, respectively.

[0156] The control circuit 223 is further configured to receive the optical power detected by the detection component D61, the detection component D62, the detection component D63, and the detection component D64; and determine whether a fault occurs between the optical splitter-combiner connected to the detection component and the receiving optical switch 221 according to the optical power detected by the detection component.

[0157] The control circuit 223 is also used to receive the optical power detected by the detection components D65, D66, D67 and D68; and to determine whether there is a fault between the optical splitter and the receiving optical switch 222 connected to the detection components based on the optical power detected by the detection components.

[0158] exist Figure 4 In the first signal transmission example shown, in plane 1, optical fiber 23 is the main optical fiber, and the optical signal output from optical fiber 23 needs to be transmitted to the receiving optical switch 221 in plane 1. In plane 2, optical fiber 27 is the main optical fiber, and the optical signal output from optical fiber 23 needs to be transmitted to the receiving optical switch 224 in plane 2. The splitting optical switches connected to the main optical fiber are splitting optical switch 311 and splitting optical switch 313. The target receiving optical switch corresponding to splitting optical switch 311 is receiving optical switch 221, and the target receiving optical switch corresponding to splitting optical switch 313 is receiving optical switch 224. The splitting optical switches connected to the backup optical fiber are splitting optical switch 312 and splitting optical switch 313.

[0159] The control circuit 223 is used to output a fourth beam splitting control signal to beam splitting switches 311 and 313, the fourth beam splitting control signal including a fourth beam splitting ratio, and to output a fifth beam splitting control signal to beam splitting switches 312 and 3114, the fifth beam splitting control signal including a fifth beam splitting ratio.

[0160] The beam splitter switch 311 is used to split the received first optical signal O1 into at least a first part optical signal O11 and a second part optical signal O12 according to the fourth beam splitting ratio. The optical power of the first part optical signal O11 is greater than the optical power of the second part optical signal O12. The first part optical signal O11 is transmitted to the target receiving optical switch 221, and the second part optical signal O12 is transmitted to the receiving optical switch 224.

[0161] The beam splitter switch 313 is used to split the received optical signal O3 into at least a first part optical signal O31 and a second part optical signal O32 according to the fourth beam splitting ratio. The optical power of the first part optical signal O31 is greater than the optical power of the second part optical signal O32. The first part optical signal O31 is transmitted to the target receiving optical switch 224, and the second part optical signal O32 is transmitted to the receiving optical switch 221.

[0162] The splitting optical switch 312 is used to split the received second optical signal O2 into at least two optical signals, namely optical signal O21 and optical signal O22, according to the fifth splitting ratio, and transmit optical signal O21 to receiving optical switch 221 and optical signal O22 to receiving optical switch 224.

[0163] The optical splitter 314 is configured to split the received optical signal O4 into at least two partial optical signals according to a fifth splitting ratio, i.e., an optical signal O41 and an optical signal O42, and transmit the optical signal O41 to the receiving optical switch 221 and transmit the optical signal O42 to the receiving optical switch 224.

[0164] The detection component D61 is configured to detect the optical power of the first partial optical signal O11 transmitted to the receiving optical switch 221, the detection component D62 is configured to detect the optical power of the optical signal O21 transmitted to the receiving optical switch 221, the detection component D63 is configured to detect the optical power of the second partial optical signal O32 transmitted to the receiving optical switch 221, and the detection component D64 is configured to detect the optical power of the optical signal O41 transmitted to the receiving optical switch 221.

[0165] The detection component D65 is configured to detect the optical power of the second partial optical signal O12 transmitted to the receiving optical switch 224, the detection component D66 is configured to detect the optical power of the optical signal O22 transmitted to the receiving optical switch 224, the detection component D67 is configured to detect the optical power of the first partial optical signal O31 transmitted to the receiving optical switch 224, and the detection component D68 is configured to detect the optical power of the optical signal O42 transmitted to the receiving optical switch 224.

[0166] The control circuit 223 is further configured to receive the optical power of the first partial optical signal O11 detected by the detection component D61, determine whether a fault occurs between the optical splitter 311 connected to the detection component D61 and the receiving optical switch 221 according to the optical power of the first partial optical signal O11 detected by the detection component D61, receive the optical power of the optical signal O21 detected by the detection component D62, determine whether a fault occurs between the optical splitter 312 connected to the detection component D62 and the receiving optical switch 221 according to the optical power of the optical signal O21 detected by the detection component D62, receive the optical power of the second partial optical signal O32 detected by the detection component D63, determine whether a fault occurs between the optical splitter 313 connected to the detection component D63 and the receiving optical switch 221 according to the optical power of the second partial optical signal O32 detected by the detection component D63, receive the optical power of the optical signal O41 detected by the detection component D64, and determine whether a fault occurs between the optical splitter 314 connected to the detection component D64 and the receiving optical switch 221 according to the optical power of the optical signal O41 detected by the detection component D64.

[0167] The control circuit 223 is also configured to receive the optical power of the second part of the optical signal O12 detected by the detection component D65, determine whether a fault occurs between the optical splitter OMS 311 connected with the detection component D65 and the receiving OXS 224 according to the optical power of the second part of the optical signal O12 detected by the detection component D65, receive the optical power of the optical signal O22 detected by the detection component D66, determine whether a fault occurs between the optical splitter OMS 312 connected with the detection component D66 and the receiving OXS 224 according to the optical power of the optical signal O22 detected by the detection component D66, receive the optical power of the first part of the optical signal O31 detected by the detection component D67, determine whether a fault occurs between the optical splitter OMS 313 connected with the detection component D67 and the receiving OXS 224 according to the optical power of the first part of the optical signal O31 detected by the detection component D67, receive the optical power of the optical signal O42 detected by the detection component D68, and determine whether a fault occurs between the optical splitter OMS 314 connected with the detection component D68 and the receiving OXS 224 according to the optical power of the optical signal O42 detected by the detection component D68. Figure 4 The second signal transmission example shown in the figure is different from the first signal transmission example shown in the figure in that the optical splitter OMS 313 receives the second transmission optical signal Oin2. The optical splitter OMS 314 receives the third optical signal O5. Figure 5

[0168] The determination of whether a fault occurs between the optical splitter OMS and the receiving OXS by the control circuit 223 is reported to the controller of the optical network 20, and the controller of the optical network 20 further transmits the information about whether a fault occurs between the optical splitter OMS and the receiving OXS to the control circuit 212 in the network node 21, so that the control circuit 212 selects a suitable standby optical fiber to transmit the optical signal in the case of a fault of the main optical fiber.

[0169] For example, as shown in the figure, Figure 4 As shown in the figure, Figure 5 As shown in the figure, the optical fiber 23 and the network node 21 are provided with an optical amplifier A1, which is configured to amplify the optical signal transmitted from the network node 21 to the optical fiber 23. The optical fiber 24 and the network node 21 are provided with an optical amplifier A2, which is configured to amplify the optical signal transmitted from the network node 21 to the optical fiber 24. The optical fiber 27 and the network node 21 are provided with an optical amplifier A3, which is configured to amplify the optical signal transmitted from the network node 21 to the optical fiber 27. The optical fiber 28 and the network node 21 are provided with an optical amplifier A4, which is configured to amplify the optical signal transmitted from the network node 21 to the optical fiber 28. A plurality of optical amplifiers can be deployed along the optical fiber 23 or the optical fiber 24 or the optical fiber 27 or the optical fiber 28 to perform multi-stage amplification on the optical signal transmitted through the optical fiber.

[0170] For example, as shown in the figure, Figure 4 For example, as shown in the figure,​Figure 5 As shown, network node 22 is also equipped with optical amplifiers A5, A6, A7, and A8. Optical amplifier A5 is connected between optical fiber 23 and optical switch 311, and is used to amplify the optical signal transmitted to network node 22 through optical fiber 23; optical amplifier A6 is connected between optical fiber 24 and optical switch 312, and is used to amplify the optical signal transmitted to network node 22 through optical fiber 24; optical amplifier A7 is connected between optical fiber 27 and optical switch 313, and is used to amplify the optical signal transmitted to network node 22 through optical fiber 27; optical amplifier A8 is connected between optical fiber 28 and optical switch 314, and is used to amplify the optical signal transmitted to network node 22 through optical fiber 23.

[0171] For example, Figure 4 or Figure 5 The network node 21 shown can also be equipped with optical receivers for plane 1 and plane 2. The connection method between the optical receivers for plane 1 and plane 2 is the same as that between the optical receivers for plane 1 and plane 2 in the network node 22. Figure 4 or Figure 5 The network node 22 shown can also be equipped with optical transmitting devices for plane 1 and plane 2. The connection method between the optical transmitting device of plane A and the optical transmitting device of plane 2 is the same as the connection method between the optical transmitting devices of plane 1 and plane 2 in network node 21. It will not be described in detail here.

[0172] For example, ​ and ​ Only two planes, plane 1 and plane 2, are shown in the diagram, but network node 21 can include more planes. Any one of the multiple planes can be connected to the optical fiber of other planes through an optical switch, which will not be elaborated here.

[0173] In the above embodiment, the control circuit 212 in network node 21 is also used to control each receiving optical switch and optical switch in network node 21. The control circuit 212 controls the receiving optical switch and optical switch to turn on the two target ports for transmitting the optical signal to be transmitted in the above example, which will not be described in detail here.

[0174] Although the present application has been described in connection with certain specific features and embodiments thereof, it is to be understood that it is not to be limited to the features and embodiments specifically described, but rather can be practiced with modification and alteration within the scope of the claims and the scope of the application. Accordingly, the specification and drawings are to be regarded in an illustrative, rather than a restrictive, sense. It is to be understood that the application is not to be limited to the particular examples disclosed, but is intended to cover all modifications which are within the scope of the application.

Claims

1. A network node, characterized by, The network node comprises: a first optical splitter and a control circuit; the first optical splitter is connected with a first optical fiber, and the first optical splitter is also connected with a second optical fiber; the control circuit is configured to output a first splitting control signal to the first optical splitter, and the first splitting control signal comprises a first splitting ratio; the first optical splitter is configured to receive a first transmission optical signal, split the first transmission optical signal into at least a first optical signal and a second optical signal according to the first splitting ratio, transmit the first optical signal to the first optical fiber, and transmit the second optical signal to the second optical fiber; the control circuit is further configured to receive a first optical power of the first optical signal output by the first optical fiber, receive a second optical power of the second optical signal output by the second optical fiber, determine whether the first optical fiber is faulty according to the first optical power, and determine whether the second optical fiber is faulty according to the second optical power; in the case where the first optical fiber or the second optical fiber is faulty, the first optical power of the first optical signal and the second optical power of the second optical signal output by the first optical splitter are not 0.

2. The network node according to claim 1, wherein the control circuit is further configured to, in the case where it is determined that the first optical fiber is faulty and the second optical fiber is normal, adjust the first splitting ratio so that the first optical power of the first optical signal output by the first optical splitter is less than the second optical power of the second optical signal; and before the first optical fiber is faulty, the first optical power of the first optical signal output by the first optical splitter is greater than the second optical power of the second optical signal.

3. The network node according to claim 2, wherein the control circuit is further configured to, in the case where it is determined that the first optical fiber is normal, adjust the first splitting ratio so that the first optical power of the first optical signal output by the first optical splitter is greater than the second optical power of the second optical signal.

4. The network node according to any one of claims 1-3, wherein the control circuit is further configured to adjust the first splitting ratio according to the second optical power so that the second optical power of the second optical signal output by the second optical fiber satisfies an output power threshold range of the second optical fiber.

5. The network node according to any one of claims 1-3, wherein the network node further comprises a first detection component and a second detection component; the first detection component is connected between the first optical splitter and the first optical fiber, and the second detection component is connected between the first optical splitter and the second optical fiber; the first detection component is configured to detect a third optical power of the first optical signal; the second detection component is configured to detect a fourth optical power of the second optical signal; the control circuit is further configured to receive the third optical power and the fourth optical power, and determine whether the first optical splitter is faulty according to the third optical power, the fourth optical power, and the first splitting ratio.

6. The network node according to claim 5, wherein The control circuit is further configured to adjust the first splitting ratio according to the fourth optical power, so that the optical power of the second optical signal transmitted to the second optical fiber meets the input power threshold range of the second optical fiber.

7. The network node of claim 5, wherein, the network node further comprises a first optical switch and a second optical switch, the first optical switch is connected between the first probe assembly and the first optical fiber, and the second optical switch is connected between the second probe assembly and the second optical fiber; the first splitting optical switch is further connected to a third optical fiber through a third optical switch, and connected to a fourth optical fiber through a fourth optical switch; the first optical switch is further connected to a second splitting optical switch and the first optical fiber, and the second optical switch is further connected to the second splitting optical switch and the second optical fiber; the third optical switch is further connected to the second splitting optical switch and the third optical fiber, and the fourth optical switch is further connected to the second splitting optical switch and the fourth optical fiber.

8. The network node of claim 7, wherein, the control circuit is further configured to adjust the first splitting ratio according to the fourth optical power and the insertion loss of the second optical switch, so that the optical power of the second optical signal transmitted to the second optical fiber meets the input power threshold range of the second optical fiber.

9. The network node of claim 7, wherein, the network node further comprises a third probe assembly and a fourth probe assembly, the third probe assembly is connected between the first optical switch and the first optical fiber, and the fourth probe assembly is connected between the second optical switch and the second optical fiber; the third probe assembly is configured to detect a fifth optical power of the first optical signal; the fourth probe assembly is configured to detect a sixth optical power of the second optical signal; the control circuit is further configured to receive the fifth optical power and the sixth optical power, and determine whether the first optical switch fails according to the fifth optical power and the third optical power, and determine whether the second optical switch fails according to the sixth optical power and the fourth optical power.

10. The network node of claim 9, wherein, the control circuit is further configured to adjust the first splitting ratio according to the sixth optical power, so that the optical power of the second optical signal transmitted to the second optical fiber meets the input power threshold range of the second optical fiber.

11. The network node of any one of claims 7-10, wherein, the network node further comprises a fifth probe assembly and a sixth probe assembly, the fifth probe assembly is connected between the first splitting optical switch and the third optical switch, and the sixth probe assembly is connected between the first splitting optical switch and the fourth optical switch; the fifth probe assembly and the sixth probe assembly are respectively configured to detect the optical power of the optical signal output by the first splitting optical switch.

12. The network node of claim 7, wherein, The second optical splitter is configured to output the optical signal to the third optical fiber and output the optical signal to the fourth optical fiber. The control circuit is further configured to adjust the first splitting ratio and output a first control signal to the second optical splitter when it is determined that the first optical fiber is faulty, the second optical fiber is faulty, the third optical fiber is normal, and the fourth optical fiber is normal. The first optical splitter splits the first transmission optical signal into a plurality of optical signals, and the first optical splitter splits the first transmission optical signal into a third optical signal according to the first splitting ratio. The first optical splitter is further configured to transmit the third optical signal to the fourth optical fiber via the fourth optical switch. The second optical splitter is further configured to transmit a second transmission optical signal to the third optical fiber via the third optical switch according to the first control signal.

13. The network node of claim 7, wherein The control circuit is further configured to output a first control signal to the second optical splitter. The second optical splitter is configured to receive a second transmission optical signal and transmit the second transmission optical signal to the third optical fiber via the third optical switch according to the first control signal. The first optical splitter splits the first transmission optical signal into a plurality of optical signals, and the first optical splitter splits the first transmission optical signal into a third optical signal according to the first splitting ratio. The first optical splitter is further configured to transmit the third optical signal to the fourth optical fiber via the fourth optical switch. The control circuit is configured to receive a seventh optical power of the second transmission optical signal output by the third optical fiber and receive an eighth optical power of the third optical signal output by the fourth optical fiber, determine whether the third optical fiber is faulty according to the seventh optical power, and determine whether the fourth optical fiber is faulty according to the eighth optical power. When the fourth optical fiber is faulty, the optical power of the third optical signal output by the first optical splitter is not 0.

14. The network node of claim 13, wherein The control circuit is configured to adjust the first splitting ratio, make the optical power of the third optical signal output by the first optical splitter greater than the optical power of the first optical signal, and make the optical power of the third optical signal output by the first optical splitter greater than the optical power of the second optical signal when it is determined that the first optical fiber is faulty, the second optical fiber is faulty, the third optical fiber is normal, and the fourth optical fiber is normal.

15. An optical network, comprising The optical network comprises a first network node, a first optical fiber, a second optical fiber, and a second network node, the first optical fiber is connected between the first network node and the second network node, and the second optical fiber is connected between the first network node and the second network node. The first network node comprises the network node of any one of claims 1-14.

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