Optical communication system, optical signal transmission method and apparatus

Abstract

The application discloses an optical communication system, an optical signal transmission method and device. The optical communication system comprises a first dummy light access device and a protection device. The first input port and the second input port of the protection device are connected with a first optical fiber path and a second optical fiber path respectively. The first dummy light access device is arranged on the first optical fiber path. When the first optical fiber path fails, the protection device can switch the first service light from the first optical fiber path received through the first input port to the second service light from the second optical fiber path received through the second input port. The first dummy light access device can conduct the first dummy light to the protection device. Therefore, when the second optical fiber path fails, the protection device switches the second service light received through the second input port to the first dummy light received through the first input port without waiting for the first dummy light access device to conduct the first dummy light. This is beneficial to avoiding the time delay caused by the dummy light filling and reducing the influence of the optical fiber break on stability.

Description

Technical Field

[0001] This application relates to the field of optical communication, and more particularly to optical communication systems, optical signal transmission methods, and apparatus. Background Technology

[0002] With the development of social informatization, the amount of data transmitted in trunk pipelines is increasing. To increase the data transmission capacity of a single optical fiber, wavelength division multiplexing (WDM) or dense wavelength division multiplexing (DWDM) technologies are typically used for optical signal multiplexing and transmission. In WDM / DWDM technology, multiple wavelengths of optical signals can exist in a single optical fiber, which is beneficial for improving transmission efficiency. Currently, the mainstream DWDM operating spectrum is mainly concentrated in the C-band and extended C-band. With the evolution of optical network generations, C-band optical systems are gradually upgraded to C+L-band optical systems. However, C+L optical systems are susceptible to changes in the number of wavelengths caused by adding or subtracting wavelengths. For example, due to the stimulated Raman scattering (SRS) effect, changes in the number of wavelengths in the C-band optical signal (e.g., adding or dropping wavelengths) will change the power of the L-band optical signal, and changes in the number of wavelengths in the L-band optical signal will also affect the power of the C-band optical signal. Therefore, in C+L optical systems, the system is usually kept in a quasi-steady full-wave state by filling in dummy light (DL) (i.e., optical signals that do not carry service information), thereby ensuring the stability of system performance.

[0003] In traditional technology, a dummy optical access device is installed between upstream and downstream nodes along the same optical fiber path. If an optical fiber break occurs between the upstream node and the dummy optical access device, the device can trigger the filling of the optical fiber path with dummy light of the same wavelength as the service light when it detects that the optical power of the service light in the optical fiber path has dropped to the point of loss of signal (LOS). This ensures that the downstream node can receive dummy light of the same wavelength as the broken service light, thereby preventing system fluctuations caused by changes in system wavelength. This ensures that the downstream node is in a quasi-steady-state full-wavelength state, which is beneficial to ensuring the stability of the downstream system.

[0004] However, traditional dummy optical access devices have limited fill rates. For example, if the fiber optic cable (i.e., the fiber path) breaks, downstream nodes may experience a non-full-wave state on the order of seconds, leading to damage to background services. Therefore, how to quickly fill dummy light and maintain the downstream system in a quasi-steady-state full-wave state when the fiber path is interrupted is a worthy research topic in C+L systems. Summary of the Invention

[0005] This application provides an optical communication system, an optical signal transmission method, and an apparatus for rapidly filling dummy light to keep the downstream system in a full-wave state.

[0006] In a first aspect, this application provides an optical communication system, which mainly includes a first dummy optical access device and a protection device. The first input port and the second input port of the protection device are respectively connected to a first optical fiber path and a second optical fiber path. The first optical fiber path is used to transmit a first service optical light, and the second optical fiber path is used to transmit a second service optical light. The second service optical light carries the same service information as the first service optical light. Furthermore, the first dummy optical access device is installed on the first optical fiber path.

[0007] Specifically, during the operation of this optical communication system, the first dummy light access device is used to control the transmission of the first service light to the protection device when the first optical fiber path is fault-free, and to block the transmission of the first dummy light to the protection device. The first dummy light and the first service light have the same wavelength band, and the first dummy light does not carry service information. The protection device is used to receive the first service light through the first input port, and when a fault is detected in the first optical fiber path, to receive the second service light from the second optical fiber path through the second input port, and to stop receiving the first service light. The first dummy light access device is also used to control the transmission of the first dummy light to the protection device when a fault is detected in the first optical fiber path, and to block the transmission of the first service light to the protection device. The protection device is also used to receive the first dummy light from the first dummy light access device through the first input port and to stop receiving the second service light when a fault is detected in the second optical fiber path.

[0008] In this aspect, since the protection device can switch from receiving the first service light through the first input port to receiving the second service light through the second input port when the first fiber path fails, and the first dummy light access device can conduct the first dummy light to the protection device, if the second fiber path fails, the protection device can switch from receiving the second service light through the second input port to receiving the first dummy light through the first input port without waiting for the first dummy light access device to conduct the first dummy light to the protection device. This helps to avoid the delay introduced by dummy light filling, thereby reducing the impact of fiber breakage on the system stability of downstream nodes.

[0009] In one possible implementation, the protection device is specifically configured to determine a first fiber optic path fault when the optical power of the first service light is detected to be less than or equal to a first threshold; and / or, the protection device is specifically configured to determine a second fiber optic path fault when the optical power of the second service light is detected to be less than or equal to the first threshold.

[0010] In this embodiment, the protection device can determine whether the first optical fiber path is faulty based on the magnitude of the optical power of the received first service light, and can determine whether the second optical fiber path is faulty based on the magnitude of the optical power of the received second service light. Therefore, it is beneficial to improve the accuracy of the protection device in judging path faults, and thus to improve the efficiency of the protection device in switching optical fiber paths.

[0011] In one possible implementation, the first dummy optical access device is specifically used to determine a first optical fiber path fault when the detected drop in the optical power of the first service light is greater than or equal to a second threshold.

[0012] In this embodiment, the first dummy optical access device determines the first optical fiber path fault by the drop in optical power of the received first service light, which helps to improve the accuracy of the first dummy optical access device in judging path faults, and thus helps to improve the efficiency of the first dummy optical access device in filling the first dummy light.

[0013] In one possible implementation, the optical communication system further includes a second dummy optical access device, which is provided on the second optical fiber path. The second dummy optical access device is used to control the transmission of the second service optical to the protection device when there is no fault in the second optical fiber path, and to block the transmission of the second dummy optical to the protection device. The second dummy optical has the same wavelength as the second service optical, and the second dummy optical does not carry service information.

[0014] In this embodiment, not only is a first dummy light access device provided in the first optical fiber path, but a second dummy light access device is also provided in the second optical fiber path. Since both the first and second optical fiber paths are equipped with devices capable of introducing dummy light into the optical fiber path, when either the first or second optical fiber path fails, the dummy light access module can introduce dummy light into the fiber. This ensures that the protection device receives the corresponding dummy light from the fiber path simultaneously with detecting the fiber path failure. This avoids the fiber path losing signal due to fiber failure, reducing the probability of fiber optic cable loss and thus mitigating the impact of fiber breakage on the system stability of downstream nodes.

[0015] In one possible implementation, the protection device is further configured to receive a second dummy light from a second dummy light access device through a second input port when the optical power of the first dummy light detected at the first input port meets a first condition, and to stop receiving the first dummy light from the first dummy light access device; wherein the first condition includes at least one of the following: the optical power of the first dummy light is less than or equal to a third threshold; or, the drop in the optical power of the first dummy light is greater than or equal to a fourth threshold.

[0016] In this embodiment, the protection device can determine that the first dummy light access module is faulty when the optical power of the first dummy light at the first input port meets the first condition (for example, the first dummy light access module does not conduct the first dummy light with suitable optical power to the protection device when the first optical fiber path is faulty). Then, it switches from selectively receiving the first dummy light to selectively receiving the second dummy light, so as to ensure that the protection device can transmit the second dummy light to the downstream node when the first optical fiber path, the second optical fiber path and the first dummy light access device are all faulty, which is beneficial to maintaining the system stability of the downstream node through the second dummy light.

[0017] In one possible implementation, the protection device is further configured to receive the first service light through the first input port and stop receiving optical signals through the second input port when the optical power of the first service light is detected to be greater than or equal to a fifth threshold.

[0018] In this embodiment, when the fault in the first optical fiber path is eliminated, that is, when the first optical fiber path returns to normal operation, the protection device can switch to receiving the first service light from the first optical fiber path, which helps to ensure the immediate recovery of service information transmission.

[0019] In one possible implementation, the first service light includes a first band optical signal and a second band optical signal, and the second service light includes a first band optical signal and a second band optical signal, wherein the wavelength range of the first band optical signal and the wavelength range of the second band optical signal do not overlap.

[0020] The optical power of the first service light is less than or equal to the first threshold, including: the optical power of the first band optical signal in the first service light is less than or equal to the first threshold, and / or, the optical power of the second band optical signal in the first service light is less than or equal to the first threshold;

[0021] The optical power of the second service light is less than or equal to the first threshold, including: the optical power of the first band optical signal in the second service light is less than or equal to the first threshold, and / or, the optical power of the second band optical signal in the second service light is less than or equal to the first threshold.

[0022] In one possible implementation, the drop in optical power of the first service light is greater than or equal to a second threshold, including: the drop in optical power of the first band optical signal in the first service light is greater than or equal to the second threshold, and / or, the drop in optical power of the second band optical signal in the first service light is greater than or equal to the second threshold.

[0023] In one possible implementation, the optical communication system further includes a control device for sending switching strategy information to a protection device, the switching strategy information being used to instruct the protection device on a switching strategy when a fiber optic path fault is detected.

[0024] In one possible implementation, the switching strategy information includes at least one of the following:

[0025] If the optical power of the first service light is less than or equal to the first threshold, then the second service light is received through the second input port, and the reception of the first service light is stopped; or, if the optical power of the second service light is less than or equal to the first threshold, then the first dummy light is received through the first input port, and the reception of the second service light is stopped; or, if the optical power of the first dummy light meets the first condition, then the second dummy light is received through the second input port, and the reception of the first dummy light is stopped; or, if the optical power of the first service light is greater than or equal to the fifth threshold, then the first service light is received through the first input port, and the reception of optical signals through the second input port is stopped.

[0026] In this embodiment, the control device can configure various switching strategies for the protection device, enabling the protection device to determine whether to perform path switching based on the optical signals detected at the first and second input ports. This facilitates the protection device in accurately switching to a path that ensures the transmission of service information, or in switching to a path that ensures the stability of the downstream node system.

[0027] Secondly, this application provides an optical signal control method applied to a protection device in an optical communication system. The protection device has a first input port and a second input port connected to a first optical fiber path and a second optical fiber path, respectively. The first optical fiber path transmits a first service light, and the second optical fiber path transmits a second service light. The second service light carries the same service information as the first service light. A first dummy light access device for transmitting a first dummy light is provided on the first optical fiber path. In this method, the protection device can detect the optical signal received at the first input port and the optical signal received at the second input port. If the first service light is detected at the first input port and the second service light is detected at the second input port, the protection device receives the first service light through the first input port. Furthermore, the protection device also detects the optical power of the optical signal at the first input port and the optical power of the optical signal at the second input port. If the optical power of the first service light is less than or equal to a first threshold, the protection device receives the second service light through the second input port and stops receiving the first service light. If the first dummy light is detected at the first input port and the second service light is detected at the second input port, and the optical power of the second service light is less than or equal to the first threshold, the protection device receives the first dummy light through the first input port and stops receiving the second service light. The first dummy light does not carry service information, and it shares the same wavelength as the first service light.

[0028] In this aspect, when the first fiber path fails (i.e., the optical power of the first service light is less than or equal to the first threshold), the protection device can switch from receiving the first service light through the first input port to receiving the second service light through the second input port; when the first input port detects the first spurious light, and the second fiber path (i.e., the optical power of the first service light is less than or equal to the first threshold) fails, the protection device can switch from receiving the second service light through the second input port to receiving the first spurious light through the first input port, without waiting for the first spurious light to be conducted to the protection device. This helps to avoid the time delay introduced by spurious light filling, thereby reducing the impact of fiber breakage on the system stability of downstream nodes.

[0029] In one possible implementation, a second dummy light access device for transmitting a second dummy light is provided on the second optical fiber path, and the method further includes:

[0030] If a first spurious light is detected at the first input port and a second spurious light is detected at the second input port, then if the optical power of the first spurious light meets the first condition, the second spurious light is received through the second input port, and the reception of the first spurious light is stopped.

[0031] The first condition includes at least one of the following: the optical power of the first dummy light is less than or equal to the third threshold; or, the drop in the optical power of the first dummy light is greater than or equal to the fourth threshold.

[0032] In one possible implementation, the method further includes: if a first service light is detected at the first input port, and the optical power of the first service is greater than or equal to a fifth threshold, the protection device receives the first service light through the first input port and stops receiving optical signals through the second input port. For example, the protection device stops receiving a second spurious light, or the protection device stops receiving a second service light.

[0033] In this embodiment, when the service light (i.e., the first service light) of the main path (i.e. the first optical fiber path) is restored, the protection device can switch to selectively receive the first service light, which helps to ensure timely transmission of service information.

[0034] In one possible implementation, the method further includes: the protection device receiving switching strategy information from the control device, the switching strategy information being used to indicate the switching strategy of the protection device when a fiber optic path fault is detected.

[0035] In one possible implementation, the switching strategy information includes at least one of the following:

[0036] If the optical power of the first service light is less than or equal to the first threshold, then the second service light is received through the second input port, and the reception of the first service light is stopped; or, if the optical power of the second service light is less than or equal to the first threshold, then the first dummy light is received through the first input port, and the reception of the second service light is stopped; or, if the optical power of the first dummy light meets the first condition, then the second dummy light is received through the second input port, and the reception of the first dummy light is stopped; or, if the optical power of the first service light is greater than or equal to the fifth threshold, then the first service light is received through the first input port, and the reception of optical signals through the second input port is stopped.

[0037] It should be noted that there are many other specific implementation methods in this application, and you can refer to the specific implementation methods and their beneficial effects in the first aspect, which will not be repeated here.

[0038] Thirdly, this application provides a protection device, which includes an interface module, a detection module, and a processing module; wherein the detection module is used to detect the optical signal of the first input port and the optical signal of the second input port; the processing module is used to determine whether to receive the optical signal of the first input port and / or whether to receive the optical signal of the second input port based on the information of the optical signal detected by the detection module (e.g., the type and power of the optical signal).

[0039] For example, the processing module is configured to, when the detection module detects that the first input port is the first service light and the second input port is the second service light, control the interface module to receive the first service light through the first input port, wherein the first service light and the second service light carry the same service information; the processing module is further configured to, when the detection module detects that the optical power of the first service light is less than or equal to a first threshold, control the interface module to receive the second service light through the second input port, and control the interface module to stop receiving the first service light; the processing module is further configured to, when the detection module detects that the first input port is the first dummy light and the second input port is the second service light, and the optical power of the second service light is less than or equal to the first threshold, control the interface module to receive the first dummy light through the first input port, and control the interface module to stop receiving the second service light, wherein the first dummy light does not carry service information and has the same wavelength as the first service light.

[0040] In one possible implementation, the processing module is further configured to, when the detection module detects that the first input port is a first dummy light, the second input port is a second dummy light, and the optical power of the first dummy light meets a first condition, control the interface module to receive the second dummy light through the second input port, and control the interface module to stop receiving the first dummy light; the first condition includes at least one of the following: the optical power of the first dummy light is less than or equal to a third threshold; or, the drop in the optical power of the first dummy light is greater than or equal to a fourth threshold.

[0041] In one possible implementation, the processing module is further configured to, when the detection module detects that the first input port is the first service light and the optical power of the first service is greater than or equal to a fifth threshold, control the interface module to receive the first service light through the first input port and stop receiving optical signals through the second input port.

[0042] In one possible implementation, the interface module is further configured to receive switching strategy information from the control device, the switching strategy information being used to indicate the switching strategy of the protection device when a fiber optic path fault is detected.

[0043] In one possible implementation, the switching strategy information includes at least one of the following:

[0044] If the optical power of the first service light is less than or equal to the first threshold, then the second service light is received through the second input port, and the reception of the first service light is stopped; or, if the optical power of the second service light is less than or equal to the first threshold, then the first dummy light is received through the first input port, and the reception of the second service light is stopped; or, if the optical power of the first dummy light meets the first condition, then the second dummy light is received through the second input port, and the reception of the first dummy light is stopped; or, if the optical power of the first service light is greater than or equal to the fifth threshold, then the first service light is received through the first input port, and the reception of optical signals through the second input port is stopped.

[0045] It should be noted that there are many other specific implementation methods in this application, and you can refer to the specific implementation methods and their beneficial effects in the first aspect, which will not be repeated here.

[0046] Fourthly, this application provides a protection device, which may be an integrated circuit chip. The integrated circuit chip includes a processor. The processor is coupled to a memory for storing programs or instructions that, when executed by the processor, cause the protection device to perform the methods described in any of the various embodiments of the foregoing aspects, as well as the foregoing aspects themselves.

[0047] Fifthly, embodiments of this application provide a computer program product containing instructions that, when executed on a computer, cause the computer to perform the methods described in any of the various embodiments of the foregoing aspects.

[0048] In a sixth aspect, embodiments of this application provide a computer-readable storage medium including instructions that, when executed on a computer, cause the computer to perform the methods described in any of the various embodiments of the foregoing aspects. Attached Figure Description

[0049] Figure 1A An example diagram of a WDM transmission system;

[0050] Figure 1B Another example diagram of a WDM transmission system;

[0051] Figure 2A An example diagram of an embodiment of the optical communication system provided in this application;

[0052] Figure 2B Another example diagram of an embodiment of the optical communication system provided in this application;

[0053] Figure 2C Another example diagram of an embodiment of the optical communication system provided in this application;

[0054] Figure 3A Another example diagram of an embodiment of the optical communication system provided in this application;

[0055] Figure 3B Another example diagram of an embodiment of the optical communication system provided in this application;

[0056] Figure 3C Another example diagram of an embodiment of the optical communication system provided in this application;

[0057] Figure 3D Another example diagram of an embodiment of the optical communication system provided in this application;

[0058] Figure 4A Another example diagram of an embodiment of the optical communication system provided in this application;

[0059] Figure 4B Another example diagram of an embodiment of the optical communication system provided in this application;

[0060] Figure 5 A flowchart of an embodiment of the optical signal processing method provided in this application;

[0061] Figure 6 A schematic diagram of an embodiment of the device provided in this application;

[0062] Figure 7 A schematic diagram of another embodiment of the device provided in this application. Detailed Implementation

[0063] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0064] In the various embodiments of this application, unless otherwise specified or in case of logical conflict, the terminology and / or descriptions of different embodiments are consistent and can be referenced by each other. The technical features of different embodiments can be combined to form new embodiments according to their inherent logical relationship.

[0065] The terms “first,” “second,” “third,” “fourth,” etc. (if present) in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a particular order or sequence. It should be understood that such terms are interchangeable where appropriate so that the embodiments described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms “comprising” and “having,” and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0066] It should be understood that the term "and / or" in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0067] It should also be understood that in the embodiments of this application, the words "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions, and embodiments or designs described as "exemplary" or "for example" should not be construed as being more preferred or advantageous than other embodiments or designs. The use of the words "exemplary" or "for example" is intended to present the relevant concepts in a specific manner to facilitate understanding.

[0068] Figure 1A This is an example diagram of a traditional WDM transmission system. Figure 1AAs shown, WDM technology allows for dozens or even hundreds of optical channels within a single optical fiber. The information to be transmitted is modulated at different optical frequencies, i.e., transmitted on optical channels of different wavelengths. To achieve flexible service scheduling, a reconfigurable optical add-drop multiplexer (ROADM) can be added to the middle of the optical fiber link. A ROADM is a device or equipment used in dense wavelength division multiplexing (DWDM) systems. It can be remotely reconfigured to arbitrarily assign wavelengths to add or drop services as needed, dynamically adjusting the wavelengths of uplink or downlink services to achieve flexible service scheduling.

[0069] Generally, WDM transmission systems typically involve the use of optical amplifiers. High-power, multi-wavelength optical signals are coupled into a single optical fiber, causing these signals to converge at a very small interface. At this point, the fiber begins to exhibit nonlinear characteristics. For example, stimulated Raman scattering (SRS) can lead to power transfer between wavelengths, meaning energy transfer exists between different wavelengths, causing a decrease in the power of certain wavelengths and becoming a key factor affecting system transmission performance. In actual optical transmission links, wavelength channels can be added or dropped due to various factors, resulting in rapid changes in the wavelength channel combination within the fiber optic link. Additions and drops can generally be categorized into active and passive additions and drops. For instance, active additions and drops can occur when a ROADM site actively schedules, locally removes, or locally adds certain wavelengths using a wavelength selection switch (WSS), causing a change in the wavelength channel combination after passing through the ROADM (i.e., a change in the optical power spectrum of the WDM signal). The speed of this change is limited by the ROADM's own response speed, typically on the order of seconds. For example, passive signal drop can occur when various sudden faults in the system (such as fiber breakage, optical amplifier failure, etc.) cause the blocking of some or all wavelengths of the WDM signal. The signal drop caused by the aforementioned faults is generally on the order of milliseconds.

[0070] In the aforementioned passive addition / drop scenario, since the wavelength of the optical signal received by the downstream station is related to the wavelength of the optical signal emitted by the upstream station, when the upstream wavelength received by the downstream station is added or dropped, it will cause a change in the Raman gain of the associated wavelength of the downstream station, which may cause bit errors in the downstream associated wavelength due to performance degradation.

[0071] In traditional technology, a dummy optical access device is installed between upstream and downstream nodes along the same optical fiber path. If an optical fiber break occurs between the upstream node and the dummy optical access device, the device can trigger the filling of the optical fiber path with dummy light of the same wavelength as the service light when it detects that the optical power of the service light in the optical fiber path has dropped to the point of loss of signal (LOS). This ensures that the downstream node can receive dummy light with the same wavelength as the broken service light, thereby preventing system fluctuations caused by changes in system wavelength. This ensures that the downstream node is in a quasi-steady-state full-wavelength state, which is beneficial for ensuring the stability of the downstream system.

[0072] However, traditional dummy optical access devices have limited fill rates, which may lead to sub-second-level non-full-wave states at downstream nodes, resulting in the impairment of background services. Therefore, how to quickly fill dummy light and maintain the downstream system in a quasi-steady-state full-wave state when the line-side fiber (i.e., fiber path) is interrupted is a worthy research topic in C+L systems.

[0073] To address the aforementioned problems, embodiments of this application provide an optical communication system, an optical signal transmission method, and an apparatus for rapidly filling dummy light and maintaining the downstream system in a quasi-steady full-wave state. For example... Figure 1B As shown, the optical communication system provided in this application can be combined with a traditional WDM transmission system. For example, two optical fiber paths can be set between wavelength division multiplexers (ROADMs), and dummy optical access devices (not shown) can be set on the optical fiber paths. Path switching can be controlled by a protection device. Furthermore, the optical communication system provided in this application can also operate independently of a traditional WDM transmission system; this embodiment is not limited. It should be noted that the protection scenario of the protection device in this application can be an optical line 1+1 optical multiplex section (OMS) protection scenario, an optical line 1+1 optical transmission section (OTS) protection scenario, or an optical line M:N protection scenario; this embodiment is not limited.

[0074] The following will combine Figure 2A , Figure 2B and Figure 2C The main structure of the optical communication system provided in this application is described below:

[0075] Figure 2A , Figure 2B and Figure 2C These are schematic diagrams illustrating one embodiment of the optical communication system provided in this application. Figure 2A This is an example diagram illustrating the optical signal transmission process when both the first and second fiber optic paths are fault-free. Figure 2BAn example diagram illustrating the optical signal transmission process after a protection switch is triggered due to a first fiber path failure. Figure 2C An example diagram illustrating the optical signal transmission process after a protection switch is triggered due to a second fiber path failure. (See diagram below.) Figure 2A , Figure 2B or Figure 2C As shown, the optical communication system includes a protection device 01 and a first dummy optical access device 02.

[0076] The protection device 01 is connected to two optical fiber paths simultaneously. The optical signals transmitted on both optical fiber paths carry the same service information, meaning the two optical fiber paths serve as backup paths for each other. Generally, the protection device 01 selects one optical fiber path from the two optical fiber paths to receive the optical signal. For example, the protection device 01 is connected to a first optical fiber path and a second optical fiber path, respectively. The first optical fiber path is used to transmit a first service optical signal, and the second optical fiber path is used to transmit a second service optical signal. The second service optical signal carries the same service information as the first service optical signal, and the protection device 01 can select one optical fiber path from the first optical fiber path to receive the optical signal. Optionally, if the optical fiber path currently being received by the protection device 01 fails, the protection device 01 can switch to receiving the optical signal from the other optical fiber path. For example, if the protection device 01 receives the first service optical signal from the first optical fiber path, then when the first optical fiber path fails, the protection device 01 can switch from receiving the first service optical signal from the first optical fiber path to receiving the second service optical signal from the second optical fiber path.

[0077] Optionally, the protection device 01 has a first input port and a second input port, wherein the first input port is connected to a first optical fiber path, and the second input port is connected to a second optical fiber path. If the first optical fiber path is used to transmit a first service light, and the second optical fiber path is used to transmit a second service light, then the protection device 01 can receive the first service light through the first input port, or receive the second service light through the second input port. Optionally, the protection device 01 is provided with an output port, which is used to output the optical signal received by the protection device 01. For example, if the output port of the protection device 01 is connected to a long fiber, the optical signal output by the protection device 01 is transmitted to a downstream node; if the output port of the protection device 01 is connected to a short fiber, the optical signal output by the protection device 01 is transmitted to a wavelength selective switch (WSS).

[0078] Furthermore, a first dummy light access device 02 is installed on the first optical fiber path. For example, the input port of the first dummy light access device 02 is connected to both the first dummy light and the first optical fiber path, and the output port of the first dummy light access device 02 is connected to the first input port of the protection device 01. The first dummy light and the first service light have the same wavelength band, and the first dummy light does not carry service information. The first dummy light access device 02 can control the optical signal emitted to the protection device 01 through its output port to be either the first dummy light or the first service light from the first optical fiber path. Since the output port of the first dummy light access device 02 is connected to the first input port of the protection device 01, the optical signal output from the first dummy light access device 02 (e.g., the first dummy light or the first service light) will illuminate the first input port of the protection device 01.

[0079] like Figure 2A As shown, when the optical communication system is working, the first dummy optical access device 02 is used to control the transmission of the first service light to the protection device 01 when the first optical fiber path is fault-free, and to block the transmission of the first dummy light to the protection device 01. That is, when the first optical fiber path is fault-free, the first dummy optical access device 02 defaults to enabling the first service light and blocking the first dummy light. At this time, the first input port of the protection device 01 can detect the first service light from the first dummy optical access device 02, and simultaneously, the second input port of the protection device 01 can detect the second service light from the second optical fiber path. The second service light carries the same service information as the first service light, that is, the second service light and the first service light are backups of each other. Therefore, the protection device 01 only needs to select one optical signal from the first service light and the second service light to receive. In this embodiment, the protection device 01 receiving the first service light through its first input port is used as an example. The protection device 01 outputs the received first service light through its output port.

[0080] In addition, while receiving the first service light, the protection device 01 will continuously monitor the optical power of the first service light, so that in the event of a first fiber optic path failure, the protection device 01 can quickly trigger protection switching to avoid introducing large transmission delays that could lead to service transmission interruption or downstream service instability. Optionally, such as... Figure 2BAs shown, when protection device 01 detects a fault in the first fiber optic path, it triggers the reception of second service light from the second fiber optic path through the second input port and stops receiving the first service light. In other words, when protection device 01 detects a fault in the first fiber optic path, it switches from receiving the first service light through the first input port to receiving the second service light through the second input port. At this time, the optical signal output from the output port of protection device 01 also changes from the first service light to the second service light. Since the first and second service lights carry the same service information, protection device 01 must quickly switch from receiving the first service light to receiving the second service light when it detects a fault in the first fiber optic path to ensure uninterrupted downstream service transmission.

[0081] Furthermore, the first dummy optical access device 02 can also determine whether the first optical fiber path is faulty by detecting the optical power of the first service optical light. For example... Figure 2B As shown, when the first dummy optical access device 02 detects a fault in the first optical fiber path, it compensates for the reduced optical signal in the first service optical light by using a dummy optical light. For example, the first dummy optical access device 02 controls the transmission of the dummy optical light to the protection device 01 and blocks the transmission of the first service optical light to the protection device 01. For example, the first dummy optical access device 02 controls the transmission of the dummy optical light to the first input port of the protection device 01, and correspondingly, the first input port of the protection device 01 can detect the dummy optical light.

[0082] It should be noted that the protection device 01 has detection modules at both input ports. These modules are used to detect the optical power of the optical signal at the input port, specifically the absolute value of the optical power or the drop in optical power. For example, the first input port of the protection device 01 has a first detection module for detecting the optical power of the optical signal at the first input port; the second input port of the protection device 01 has a second detection module for detecting the optical power of the optical signal at the second input port. Exemplarily, the detection module can be a photoelectric diode (PD) or other devices with power detection functionality; this embodiment is not limited to any particular type. Optionally, the detection module may also support detecting the type of optical power, i.e., determining whether the optical signal is active light or spoofed light by converting the optical signal into an electrical signal.

[0083] In this embodiment, the protection device 01 can determine whether the optical fiber path transmitting the received optical signal is faulty based on the optical power and / or type of the detected optical signal. For example, in Figure 2BIn the scenario shown, the detection module located at the first input port of the protection device 01 (hereinafter referred to as the first detection module) can determine whether the first optical fiber path is faulty by detecting the optical power of the first service light; the detection module located at the first input port of the protection device 01 (hereinafter referred to as the first detection module) can determine whether the optical fiber path between the first dummy light access device 02 and the protection device 01 is faulty by detecting the optical power of the first dummy light; and the detection module located at the second input port of the protection device 01 (hereinafter referred to as the second detection module) can determine whether the second optical fiber path transmitting the second service light is faulty by detecting the optical power of the second service light.

[0084] like Figure 2C As shown, when the protection device 01 detects a fault in the second optical fiber path, the protection device 01 receives the first spurious light from the first spurious light access device 02 through the first input port, and the protection device 01 stops receiving the second service light from the second optical fiber path. That is, the protection device 01 switches from selectively receiving the second service light detected by the second input port to selectively receiving the first spurious light detected through the first input port.

[0085] Therefore, in this communication system, when the first fiber optic path fails, the protection device 01 not only switches from receiving the first service light (originating from the first fiber optic path) to receiving the second service light (from the second fiber optic path), but also the first dummy light access device 02 controls the first dummy light to be transmitted to the first input port of the protection device 01. When the second fiber optic path fails, the first dummy light has already been connected to the fiber and transmitted to the first input port of the protection device 01. Therefore, the protection device 01 directly switches from receiving the second service light (from the second fiber optic path) to receiving the first dummy light (from the first dummy light access device 02 downstream of the first fiber optic path), without needing to wait for the first dummy light access device 02 to transmit the first dummy light to the first input port of the protection device 01. In other words, it saves the time spent by the first dummy light access device gradually shutting down the first service light and gradually turning on the first dummy light, enabling the protection device 01 to quickly transmit the first dummy light to the output port. Since the wavelengths of the first dummy light, the first service light, and the second service light are all the same, the protection device 01 quickly conducts the first dummy light to the output port, which helps to prevent system fluctuations caused by optical signal drop at downstream nodes and ensures the stability of downstream nodes. Furthermore, the optical communication system provided in this embodiment can tolerate two fiber optic failures (e.g., a first fiber optic path failure and a second fiber optic path failure), which, compared to traditional technologies that can only tolerate one fiber optic path failure, improves the reliability of the optical communication system.

[0086] Optionally, the protection device 01 is also used to receive the first service light through the first input port and stop receiving optical signals through the second input port when the first optical fiber path is detected to have resumed operation.

[0087] It should be noted that the first dummy light transmitted from the first dummy light access device 02 to the protection device 01 can be generated by the first dummy light access device 02 or received by the first dummy light access device 02 from other devices. Examples are given below:

[0088] In one example, the first dummy light is generated by a first dummy light access device 02. For example, the first dummy light access device 02 is internally provided with a dummy light source and a filter, and the first dummy light access device 02 can guide dummy light (e.g., the first dummy light) into the optical fiber as needed.

[0089] In another example, the first dummy light is received by the first dummy light access device 02 from another device. For example, such as Figure 2A , Figure 2B or Figure 2C As shown, the optical communication system also includes a first dummy light generating device 03, which generates a first dummy light. The output port of the first dummy light generating device 03 is connected to the input port of the first dummy light access device 02, enabling it to send the first dummy light to the input port of the first dummy light access device 02. For example, the first dummy light generating device 03 internally includes a dummy light source and a filter. The dummy light emitted by the dummy light source is processed by the filter to obtain the first dummy light, which is then transmitted to the input port of the first dummy light access device 02.

[0090] In this embodiment, the first false light can be generated in any of the aforementioned ways, and this embodiment is not limited to any of them.

[0091] It should also be noted that in this embodiment, each device (e.g., the first dummy optical access device 02 or the protection device 01) can determine whether the optical fiber path is faulty by detecting the optical power of the optical signal. These will be described in detail below:

[0092] In one possible implementation, the protection device 01 is capable of detecting the optical power of a first service light from a first optical fiber path and determining whether the first optical fiber path is faulty based on the optical power of the first service light. For example, the protection device 01 determines that the first optical fiber path is faulty when the optical power of the first service light is less than or equal to a first threshold. Similarly, the protection device 01 is capable of detecting the optical power of a second service light from a second optical fiber path and determining whether the second optical fiber path is faulty based on the optical power of the second service light. For example, the protection device 01 determines that the second optical fiber path is faulty when the optical power of the second service light is less than or equal to a first threshold.

[0093] Optionally, the first threshold is the threshold at which the first service light falls to the LOS (Loss of Optical Surface). The first threshold can be a pre-configured threshold or a threshold sent to the protection device 01 by other devices (e.g., the control device described later); this embodiment is not limited to this. For example, if the first threshold is -25dB, when the protection device 01 detects that the optical power of the first service light is less than or equal to -25dB, the protection device 01 determines that the first fiber optic path is faulty, and then the protection device 01 triggers a protection switchover (e.g., switching from selectively receiving the first service light from the first fiber optic path to selectively receiving the second service light from the second fiber optic path). For example, if the first threshold is -25dB, when the protection device 01 detects that the optical power of the second service light is less than or equal to -25dB, the protection device 01 determines that the second fiber optic path is faulty, and then the protection device 01 triggers a protection switchover (e.g., switching from selectively receiving the second service light from the second fiber optic path to selectively receiving the first dummy light).

[0094] Optionally, the protection device 01 is connected to a first position on the first optical fiber path via a first branch optical fiber. The first position is located upstream of the input port of the first dummy optical access device 02 and downstream of the fault point. The protection device 01 obtains the optical power of the first service light passing through the first position in the first optical fiber path.

[0095] Optionally, if the protection device 01 detects that the optical power of the first service light is greater than or equal to the fifth threshold, the protection device 01 receives the first service light through the first input port and stops receiving optical signals through the second input port.

[0096] In one possible implementation, the first dummy optical access device 02 can detect the optical power of the first service light from the first optical fiber path and determine whether the first optical fiber path is faulty based on the optical power of the first service light. For example, the first dummy optical access device 02 determines that the first optical fiber path is faulty when the drop in the optical power of the first service light is greater than or equal to a second threshold. Optionally, the second threshold is a threshold for triggering dummy light filling. The second threshold can be a pre-configured threshold or a threshold sent to the first dummy optical access device 02 by other devices (e.g., the control device described later), and this embodiment is not limited. For example, if the second threshold is 10dB, then when the first dummy optical access device 02 detects that the drop in the optical power of the first service light is greater than or equal to 10dB, the first dummy optical access device 02 determines that the first optical fiber path is faulty, and then the first dummy optical access device 02 triggers the use of the first dummy light to fill the optical fiber between the first dummy optical access device 02 and the protection device 01.

[0097] Optional, such as Figure 2A , Figure 2B or Figure 2CAs shown, the optical communication system also includes a control device 04, which is used to send switching strategy information to the protection device 01. The switching strategy information is used to instruct the protection device 01 on the switching strategy when a fiber optic path fault is detected.

[0098] For example, the switching policy information includes at least one of the following:

[0099] Switching Strategy 1: If the optical power of the first service light is less than or equal to the first threshold, then the second service light is received through the second input port, and the reception of the first service light is stopped. For example, if the first input port detects the first service light, and the second input port detects the second service light, then if the optical power of the first service light is less than or equal to the first threshold, the second service light is received through the second input port, and the reception of the first service light is stopped.

[0100] Switching Strategy 2: If the optical power of the second service light is less than or equal to the first threshold, then the first dummy light is received through the first input port, and the reception of the second service light is stopped. For example, if the first input port detects the first dummy light, and the second input port detects the second service light, then if the optical power of the second service light is less than or equal to the first threshold, the first dummy light is received through the first input port, and the reception of the second service light is stopped.

[0101] Switching Strategy 3: If the optical power of the first service light is greater than or equal to the fifth threshold, then the first service light is received through the first input port, and the reception of optical signals through the second transmission port is stopped. For example, if the first input port detects the first service light, then if the optical power of the first service light is greater than or equal to the fifth threshold, the first service light is received through the first input port, and the reception of optical signals through the second transmission port is stopped.

[0102] Optionally, the control device 04 is also used to send a second threshold to the first dummy optical access device 02.

[0103] Therefore, the control device 04 can send a switching strategy to the protection device 01, enabling the protection device 01 to determine the fiber optic path to be selected for reception based on information about the optical signal detected at the first input port (e.g., the type and / or power of the optical signal) and / or the optical signal detected at the second input port (e.g., the type and / or power of the optical signal). This not only improves the switching efficiency of the protection device 01 but also reduces the impact of the switching process on downstream nodes, thereby enhancing the reliability and stability of the system.

[0104] Furthermore, in some embodiments, not only is the first optical fiber path equipped with a device for providing dummy light (e.g., the aforementioned first dummy light access device 02), but the second optical fiber path may also be equipped with a dummy light access device. This will be described below with specific examples:

[0105] Figure 3A , Figure 3B , Figure 3C and Figure 3D These are schematic diagrams illustrating another embodiment of the optical communication system provided in this application. Figure 3A This is an example diagram illustrating the optical signal transmission process when both the first and second fiber optic paths are fault-free. Figure 3B An example diagram illustrating the optical signal transmission process after a protection switch is triggered due to a first fiber path failure. Figure 3C An example diagram illustrating the optical signal transmission process after a protection switch is triggered due to a second fiber path failure. (See diagram below.) Figure 3A As shown, in addition to the protection device 01 and the first dummy optical access device 02, the optical communication system also includes a second dummy optical access device 05. For details regarding the functions and connection methods of the protection device 01 and the first dummy optical access device 02, please refer to the preceding description; they will not be repeated here.

[0106] Furthermore, a second dummy light access device 05 is provided on the second optical fiber path. For example, the input port of the second dummy light access device 05 is connected to both the second dummy light and the second optical fiber path, and the output port of the second dummy light access device 05 is connected to the second input port of the protection device 01. The second dummy light and the second service light have the same wavelength band, and the second dummy light does not carry service information. The second dummy light access device 05 can control the optical signal emitted to the protection device 01 through its output port to be either the second dummy light or the second service light from the second optical fiber path. Since the output port of the second dummy light access device 05 is connected to the second input port of the protection device 01, the optical signal output from the second dummy light access device 05 (e.g., the second dummy light or the second service light) will illuminate the second input port of the protection device 01.

[0107] Furthermore, the working principle of the second dummy optical access device 05 is similar to that of the first dummy optical access device 02. For example... Figure 3AAs shown, when the optical communication system is working, the second dummy light access device 05 is used to control the transmission of the second service light to the protection device 01 when the second optical fiber path is fault-free, and to block the transmission of the second dummy light to the protection device 01. That is, when the second optical fiber path is fault-free, the second dummy light access device 05 defaults to conducting the second service light and blocking the second dummy light. At this time, the second input port of the protection device 01 can detect the second service light from the second dummy light access device 05, and at the same time, the first input port of the protection device 01 can detect the first service light from the first dummy light access device 02. For an explanation of the first dummy light access device 02 and the first dummy light generation device 03, please refer to the relevant introduction above, which will not be repeated here. The second service light and the first service light carry the same service information, that is, the second service light and the first service light are backups of each other. Therefore, the protection device 01 only needs to select one optical signal to receive from the first service light and the second service light. In this embodiment, the protection device 01 receives the first service light through the first input port as an example. The protection device 01 outputs the received first service light through the output port of the protection device 01.

[0108] In addition, while receiving the first service light, the protection device 01 will continuously monitor the optical power of the first service light, so that in the event of a first fiber optic path failure, the protection device 01 can quickly trigger protection switching to avoid introducing large transmission delays that could lead to service transmission interruption or downstream service instability. Optionally, such as... Figure 3B As shown, when protection device 01 detects a fault in the first fiber optic path, it triggers the reception of second service light from the second fiber optic path through the second input port and stops receiving the first service light. In other words, when protection device 01 detects a fault in the first fiber optic path, it switches from receiving the first service light through the first input port to receiving the second service light through the second input port. At this time, the optical signal output from the output port of protection device 01 also changes from the first service light to the second service light. Since the first and second service lights carry the same service information, protection device 01 must quickly switch from receiving the first service light to receiving the second service light when it detects a fault in the first fiber optic path to ensure uninterrupted downstream service transmission.

[0109] Furthermore, the first dummy optical access device 02 can also determine whether the first optical fiber path is faulty by detecting the optical power of the first service optical light. For example... Figure 3BAs shown, when the first dummy optical access device 02 detects a fault in the first optical fiber path, it compensates for the reduced optical signal in the first service optical light by using a dummy optical light. For example, the first dummy optical access device 02 controls the transmission of the dummy optical light to the protection device 01 and blocks the transmission of the first service optical light to the protection device 01. For example, the first dummy optical access device 02 controls the transmission of the dummy optical light to the first input port of the protection device 01, and correspondingly, the first input port of the protection device 01 can detect the dummy optical light.

[0110] like Figure 3C As shown, when the protection device 01 detects a fault in the second optical fiber path, the protection device 01 receives the first spurious light from the first spurious light access device 02 through the first input port, and the protection device 01 stops receiving the second service light from the second optical fiber path. That is, the protection device 01 switches from selectively receiving the second service light detected by the second input port to selectively receiving the first spurious light detected through the first input port.

[0111] Furthermore, the second dummy optical access device 05 can also determine whether a fault has occurred in the second optical fiber path by detecting the optical power of the second service optical light. For example... Figure 3C As shown, when the second dummy optical access device 05 detects a fault in the second optical fiber path, it compensates for the reduced optical signal in the second service optical light by using a second dummy optical light. For example, the second dummy optical access device 05 controls the transmission of the second dummy optical light to the protection device 01 and blocks the transmission of the second service optical light to the protection device 01. For example, the second dummy optical access device 05 controls the transmission of the second dummy optical light to the second input port of the protection device 01, and correspondingly, the second input port of the protection device 01 can detect the second dummy optical light.

[0112] Optionally, the protection device 01 can also determine whether the first dummy light access device 02 or the first dummy light generation device 03 is faulty based on the optical signal at the first input port. For example, if the protection device 01 detects that the optical power of the first dummy light at the first input port meets a first condition, then the protection device 01 determines that the first dummy light access device 02 or the first dummy light generation device 03 is faulty. The first condition includes at least one of the following: the optical power of the first dummy light is less than or equal to a third threshold; and / or, the drop in the optical power of the first dummy light is greater than or equal to a fourth threshold.

[0113] In addition, such as Figure 3D As shown, when the protection device 01 determines that the first fake light access device 02 or the first fake light generation device 03 is faulty, the protection device 01 receives the second fake light from the second fake light access device 05 through the second input port, and the protection device 01 stops receiving the first fake light from the first fake light access device 02.

[0114] Therefore, in this communication system, when the second optical fiber path fails, the protection device 01 not only switches from receiving the second service light (originating from the second optical fiber path) to receiving the first dummy light (from the first dummy light access device 02 of the first optical fiber path), but also the second dummy light access device 05 controls the second dummy light to be transmitted to the second input port of the protection device 01. When the first dummy light access device 02 or the first dummy light generating device 03 fails, the second dummy light has already been connected to the optical fiber and transmitted to the second input port of the protection device 01. Therefore, the protection device 01 directly switches from receiving the first dummy light (from the first dummy light access device 02 of the first optical fiber path) to receiving the second dummy light (from the second dummy light access device 05 of the second optical fiber path), without needing to wait for the second dummy light access device 05 to transmit the second dummy light to the second input port of the protection device 01. In other words, it saves the time spent by the second dummy light access device gradually shutting down the second service light and gradually turning on the second dummy light, and enables the protection device 01 to quickly turn on the second dummy light to the output port. Since the wavelengths of the first dummy light, the second dummy light, the first service light, and the second service light are all the same, the protection device 01 quickly connects the second dummy light to the output port, which helps to prevent system fluctuations caused by optical signal drop at downstream nodes and ensures the stability of downstream nodes. Furthermore, the optical communication system provided in this embodiment can tolerate two fiber optic failures (e.g., a first fiber optic path failure and a second fiber optic path failure), which, compared to traditional technologies that can only tolerate one fiber optic path failure, improves the reliability of the optical communication system.

[0115] It should be noted that the second dummy light transmitted from the second dummy light access device 05 to the protection device 01 can be generated by the second dummy light access device 05 or received by the second dummy light access device 05 from other devices. Examples are given below:

[0116] In one example, the second dummy light is generated by the second dummy light access device 05. For example, the second dummy light access device 05 is internally provided with a dummy light source and a filter, and the second dummy light access device 05 can guide dummy light (e.g., the second dummy light) into the optical fiber as needed.

[0117] In another example, the second dummy light is received by the second dummy light access device 05 from other devices. For example, such as... Figure 3A , Figure 3B , Figure 3C or Figure 3DAs shown, the optical communication system also includes a second dummy light generating device 06, which generates a second dummy light. The output port of the second dummy light generating device 06 is connected to the input port of the second dummy light access device 05, enabling it to send the second dummy light to the input port of the second dummy light access device 05. For example, the second dummy light generating device 06 internally includes a dummy light source and a filter. The dummy light emitted by the dummy light source is processed by the filter to obtain the second dummy light, which is then transmitted to the input port of the second dummy light access device 05.

[0118] In this embodiment, the second false light can be generated in any of the aforementioned ways, and this embodiment is not limited to any of them.

[0119] It should also be noted that, in this embodiment, in addition to the first dummy optical access device 02 and the protection device 01 being able to determine whether the optical fiber path is faulty by detecting the optical power of the optical signal, the second dummy optical access device 05 can also determine whether the optical fiber path is faulty by detecting the optical power of the optical signal.

[0120] In one possible implementation, the second dummy optical access device 05 can detect the optical power of the second service light from the second optical fiber path and determine whether the second optical fiber path is faulty based on the optical power of the second service light. For example, the second dummy optical access device 05 determines that the second optical fiber path is faulty when the drop in the optical power of the second service light is greater than or equal to a second threshold. Optionally, the second threshold is a threshold for triggering dummy light filling. The second threshold can be a pre-configured threshold or a threshold sent to the second dummy optical access device 05 by other devices (e.g., the control device described later), and this embodiment is not limited thereto. For example, if the second threshold is 10dB, then when the second dummy optical access device 05 detects that the drop in the optical power of the second service light is greater than or equal to 10dB, the second dummy optical access device 05 determines that the second optical fiber path is faulty, and then the second dummy optical access device 05 triggers the filling of the optical fiber between the second dummy optical access device 05 and the protection device 01 with the second dummy light.

[0121] It should also be noted that since the first service light and the second service light carry the same service information, and the wavelengths of the first service light and the second service light are the same, the first dummy light and the second dummy light also have the same wavelength, and even the same optical signal. Therefore, the first dummy light generation device 03 and the second dummy light generation device 06 can be implemented using a single device. For example, the dummy light access device can split the output dummy light into two optical signals: one optical signal, the first dummy light, which will be transmitted to the first dummy light access device 02, and the other optical signal, the second dummy light, which will be transmitted to the second dummy light access device 05.

[0122] Optional, such as Figure 3A , Figure 3B or Figure 3C As shown, the optical communication system also includes a control device 04, which is used to send switching strategy information to the protection device 01. The switching strategy information is used to instruct the protection device 01 on the switching strategy when a fiber optic path fault is detected.

[0123] For example, the switching policy information includes at least one of the following:

[0124] Switching Strategy 1: If the optical power of the first service light is less than or equal to the first threshold, then the second service light is received through the second input port, and the reception of the first service light is stopped. For example, if the first input port detects the first service light, and the second input port detects the second service light, then if the optical power of the first service light is less than or equal to the first threshold, the second service light is received through the second input port, and the reception of the first service light is stopped.

[0125] Switching Strategy 2: If the optical power of the second service light is less than or equal to the first threshold, then the first dummy light is received through the first input port, and the reception of the second service light is stopped. For example, if the first input port detects the first dummy light, and the second input port detects the second service light, then if the optical power of the second service light is less than or equal to the first threshold, the first dummy light is received through the first input port, and the reception of the second service light is stopped.

[0126] Switching strategy 3: If the optical power of the first service light is greater than or equal to the fifth threshold, then the first service light is received through the first input port, and the reception of optical signals through the second transmission port is stopped.

[0127] Switching Strategy 4: If the optical power of the first dummy light meets the first condition, then the second dummy light is received through the second input port, and the reception of the first dummy light is stopped. For example, if the first input port detects the first dummy light, and the second input port detects the second dummy light, then if the optical power of the first dummy light meets the first condition, the second dummy light is received through the second input port, and the reception of the first dummy light is stopped.

[0128] In this embodiment, the control device can configure various switching strategies for the protection device, enabling the protection device to determine whether to perform path switching based on the optical signals detected at the first and second input ports. This facilitates the protection device in accurately switching to a path that ensures the transmission of service information, or in switching to a path that ensures the stability of the downstream node system.

[0129] It should be noted that the first service light can be a combination of two or more wavelength bands. Optionally, the first service light includes a first-band optical signal and a second-band optical signal, wherein the wavelength ranges of the first-band optical signal and the second-band optical signal do not overlap. For example, the first-band optical signal is a C-band optical signal and the second-band optical signal is an L-band optical signal. For example, the wavelength range of the C-band is from 1530nm to 1565nm; the wavelength range of the L-band is from 1565nm to 1625nm. Since the first dummy light has the same wavelength band as the first service light, the first dummy light also includes both the first-band and second-band optical signals. For example, if the first-band optical signal is a C-band optical signal and the second-band optical signal is an L-band optical signal, then the first dummy light includes both the C-band and L-band optical signals. Furthermore, since the first service light and the second service light are backups for each other, the second service light also includes both the first-band and second-band optical signals. For example, if the first band optical signal is a C-band optical signal and the second band optical signal is an L-band optical signal, then the second service optical signal includes both C-band and L-band optical signals.

[0130] Furthermore, since both the service light (e.g., the first service light and the second service light) and the dummy light (e.g., the first dummy light or the second dummy light) are optical signals with two wavelengths, the same dummy light access device includes modules for controlling dummy light access in two different wavelengths. For example, a module for controlling C-band dummy light access (hereinafter referred to as the C-band dummy light access module) and a module for controlling L-band dummy light access (hereinafter referred to as the L-band dummy light access module). Optionally, a dummy light access module for a certain wavelength includes a dummy light control switch and an optical amplifier for that wavelength. The dummy light control switch can be a variable optical attenuator (VOA), capable of controlling the amount of optical power attenuation in the fiber optic link. For example, the attenuation of the VOA can be set to any value within an adjustable range. For example, as shown... Figure 4A or Figure 4B As shown, the first dummy optical access device includes a C-band dummy optical access module (e.g., a device composed of VOA1 and a C-band optical amplifier) ​​and an L-band dummy optical access module (e.g., a device composed of VOA2 and an L-band optical amplifier). Figure 4B As shown, the second dummy optical access device includes a C-band dummy optical access module (e.g., a device composed of VOA3 and a C-band optical amplifier) ​​and an L-band dummy optical access module (e.g., a device composed of VOA4 and an L-band optical amplifier).

[0131] In addition, the protection device is also equipped with input ports (e.g., C-band input port and L-band input port) and output ports (C-band output port and L-band output port) for different frequency bands. For example, such as... Figure 4A or Figure 4B As shown, the first input port of the protection device (e.g., optical fiber line auto switch protection equipment, OLP) includes port 1 and port 2, wherein port 1 is a C-band input port and port 2 is an L-band input port; the second input port of the protection device includes port 3 and port 4, wherein port 3 is a C-band input port and port 4 is an L-band input port; the output port of the protection device includes port 5 and port 6, wherein port 5 is a C-band input port and port 6 is an L-band input port.

[0132] When the first service light, the second service light, the first dummy light, or the second dummy light has optical signals in two bands (e.g., C-band and L-band), the protection device 01 can determine that the fiber optic path is faulty if the optical signal in one of the bands meets the threshold, thereby triggering protection switching. The following will combine... Figure 4A and Figure 4B The specific examples shown will be introduced as follows:

[0133] For example, the optical power of the first service light being less than or equal to the first threshold can be understood as the optical power of the first band optical signal being less than or equal to the first threshold, and / or the optical power of the second band optical signal being less than or equal to the first threshold. In other words, when the optical signal of one band in the first service light is less than or equal to the first threshold, the protection device can determine that the optical power of the first service light is less than or equal to the first threshold. For example, in Figure 4A or Figure 4B In the example shown, if the optical power of the C-band optical signal or the optical power of the L-band optical signal in the first optical fiber path is less than or equal to a first threshold, the protection device determines that the first optical fiber path is faulty and may trigger a protection switchover. For example, if the second optical fiber path is working normally, the protection device switches from receiving optical signals from the first optical fiber path to receiving optical signals from the second optical fiber path. For example, it switches from receiving C-band optical signals through port 1 to receiving C-band optical signals through port 3, and from receiving L-band optical signals through port 2 to receiving L-band optical signals through port 4. At this time, port 5 of the protection device outputs C-band optical signals from the second optical fiber path, and port 6 outputs L-band optical signals from the second optical fiber path.

[0134] For example, the drop in optical power of the first service light being greater than or equal to the second threshold can be understood as the drop in optical power of the first band optical signal being greater than or equal to the second threshold, and / or the drop in optical power of the second band optical signal being greater than or equal to the second threshold. That is, when the drop in optical power of one band of the first service light is greater than or equal to the second threshold, the first dummy optical access device can determine that the drop in optical power of the first service light is greater than or equal to the second threshold. For example, in Figure 4A or Figure 4B In the example shown, if the optical power drop of the C-band optical signal in the first optical fiber path is greater than or equal to the first threshold, the C-band dummy light access module in the first optical fiber path controls the dummy light access of the C-band to enter the optical fiber and blocks the C-band service light. At this time, the optical signal detected by port 1 is the C-band dummy light rather than the C-band service light. Similarly, if the optical power drop of the L-band optical signal in the first optical fiber path is greater than or equal to the first threshold, the L-band dummy light access module in the first optical fiber path controls the L-band dummy light access to enter the optical fiber and blocks the L-band service light. At this time, the optical signal detected by port 2 is the L-band dummy light rather than the L-band service light.

[0135] For example, the optical power of the second service light being less than or equal to the first threshold can be understood as the optical power of the first band optical signal being less than or equal to the first threshold, and / or the optical power of the second band optical signal being less than or equal to the first threshold. That is, when the optical signal of one band of the second service light is less than or equal to the first threshold, the protection device can determine that the optical power of the second service light is less than or equal to the first threshold. For example, in Figure 4A or Figure 4BIn the example shown, if the optical power of the C-band optical signal or the optical power of the L-band optical signal in the second optical fiber path is less than or equal to a first threshold, the protection device determines that the second optical fiber path is faulty and may trigger a protection switchover. For example, if the first optical fiber path is working normally, or if the first dummy optical access device has filled the first optical fiber path with dummy light, the protection device can switch from receiving optical signals from the second optical fiber path to receiving optical signals from the first optical fiber path. For example, it switches from receiving C-band optical signals through port 3 to receiving C-band optical signals through port 1, and from receiving L-band optical signals through port 4 to receiving L-band optical signals through port 2. Wherein, if the first optical fiber path is working normally, the C-band optical signal received through port 1 is C-band service light, and the L-band optical signal received through port 2 is L-band service light; if the first optical fiber path is faulty and the first dummy optical access device is working normally, the C-band optical signal received through port 1 is C-band dummy light, and the L-band optical signal received through port 2 is L-band dummy light. At this time, port 5 of the protection device outputs a C-band optical signal from the first optical fiber path, and port 6 outputs an L-band optical signal from the first optical fiber path.

[0136] For example, the drop in optical power of the second service light being greater than or equal to the second threshold can be understood as the drop in optical power of the first band optical signal being greater than or equal to the second threshold, and / or the drop in optical power of the second band optical signal being greater than or equal to the second threshold. In other words, when the drop in optical power of one band of the second service light is greater than or equal to the second threshold, the second dummy optical access device can determine that the drop in optical power of the second service light is greater than or equal to the second threshold. For example, in Figure 4B In the example shown, if the optical power drop of the C-band optical signal in the second optical fiber path is greater than or equal to the second threshold, the C-band dummy light access module in the second optical fiber path controls the dummy light access of the C-band to the optical fiber and blocks the C-band service light. At this time, the optical signal detected by port 3 is the C-band dummy light, not the C-band service light. Similarly, if the optical power drop of the L-band optical signal in the second optical fiber path is greater than or equal to the second threshold, the L-band dummy light access module in the second optical fiber path controls the L-band dummy light access to the optical fiber and blocks the L-band service light. At this time, the optical signal detected by port 4 is the L-band dummy light, not the L-band service light.

[0137] Therefore, the protection device 01 can determine whether the path is faulty based on the change in optical power of one of the bands, and then decide whether to switch the path for receiving optical signals. This helps to improve the sensitivity of the protection device 01 in switching paths.

[0138] Furthermore, this application embodiment also provides an optical signal transmission method. In this method, the protection device can collect information about the optical signal at the first input port and information about the optical signal at the second input port, thereby determining whether to trigger a switching strategy to ensure that the dummy optical module (e.g., the first dummy optical access device or the second dummy optical access device) has sufficient time to perform dummy optical filling, while also ensuring that the downstream system is in a quasi-steady full-wave state. The following will combine... Figure 5 The main flow of the optical signal transmission method provided in this application is described below:

[0139] like Figure 5 The diagram shown is a flowchart of an embodiment of the optical signal transmission method provided in this application. In this embodiment, a protection device is used as an example for illustration. Of course, the entity performing the protection device's operation in this method can also be a unit, module, or chip within the protection device; this embodiment does not specifically limit this. For example, as... Figure 5 As shown, the optical signal transmission method includes the following steps:

[0140] Step 501: The protection device acquires the optical signal detected by the first input port and the optical signal detected by the second input port.

[0141] The first input port is connected to the first optical fiber path, and the second input port is connected to the second optical fiber path. The first optical fiber path is used to transmit the first service light, and the second optical fiber path is used to transmit the second service light. The first service light and the second service light carry the same service information. Therefore, the optical signal detected by the first input port can be the first service light, and the optical signal detected by the second input port can be the second service light.

[0142] Optionally, a first dummy light access device is provided on the first optical fiber path. The first dummy light access device is used to introduce a first dummy light to the protection device. The first dummy light has the same wavelength as the first service light and does not carry service information. Therefore, the optical signal detected by the first input port can also be the first dummy light.

[0143] Optionally, a second dummy light access device is provided on the second optical fiber path. This device is used to introduce a second dummy light into the protection device. The second dummy light has the same wavelength as the second service light and does not carry service information. Therefore, the optical signal detected by the second input port can also be the second dummy light.

[0144] For an explanation of the connection relationship between the first dummy optical access device, the second dummy optical access device, and the protection device, please refer to the previous text. Figure 2A or Figure 3A The relevant descriptions in the corresponding embodiments will not be repeated here.

[0145] It should be noted that the protection device may only detect the optical power of the optical signal at the input port (e.g., the first input port or the second input port), or it may detect both the optical power and the type of the optical signal at the input port (i.e., whether the optical signal is service light or dummy light). This embodiment is not limited to this.

[0146] Step 502: If a first service light is detected at the first input port and a second service light is detected at the second input port, the protection device receives the first service light through the first input port.

[0147] When both the first and second fiber optic paths are operating normally, the protection device can preferentially select the first service light from the first fiber optic path, that is, use the first service light from the first fiber optic path as the working optical signal, and use the second service light from the second fiber optic path as the protection optical signal.

[0148] Step 503: If the optical power of the first service light is less than or equal to the first threshold, the protection device receives the second service light through the second input port and stops receiving the first service light.

[0149] When the optical power of the first service light is less than or equal to the first threshold, the first fiber path is faulty, and the protection device switches from selectively receiving the first service light from the first fiber path to selectively receiving the second service light from the second fiber path.

[0150] Step 504: If a first spurious light is detected at the first input port and a second service light is detected at the second input port, and the optical power of the second service light is less than or equal to the first threshold, then the protection device receives the first spurious light through the first input port and stops receiving the second service light.

[0151] In this embodiment, step 504 is an optional step. For example, when the first optical fiber path is equipped with a first spurious light access device, a fault in the first optical fiber path will trigger the first spurious light generation device to conduct the first spurious light to the first input port of the protection device. Therefore, the protection device can detect the first spurious light at the first input port.

[0152] When the optical power of the second service light is less than or equal to the first threshold, the second fiber optic path is faulty, and the protection device switches from receiving the second service light from the second fiber optic path through the second input port to receiving the first spurious light through the first input port.

[0153] Step 505: If a first false light is detected at the first input port, a second false light is detected at the second input port, and the optical power of the first false light meets the first condition, then the protection device receives the second false light through the second input port and stops receiving the first false light.

[0154] In this embodiment, step 505 is an optional step. For example, when the second optical fiber path is equipped with a second spurious light access device, a fault in the second optical fiber path will trigger the second spurious light generation device to conduct the second spurious light to the second input port of the protection device. Therefore, the protection device can detect the second spurious light at the second input port.

[0155] The first condition includes at least one of the following: the optical power of the first spurious light is less than or equal to a third threshold; or, the drop in the optical power of the first spurious light is greater than or equal to a fourth threshold. For an explanation of the first condition, please refer to the relevant description in the preceding embodiments; it will not be repeated here. When the optical power of the first spurious light meets the first condition, the first spurious light access device malfunctions. The protection device cannot detect a first spurious light or first service light with sufficient power at the first input port. Therefore, the protection device switches from receiving the first spurious light through the first input port to receiving the second spurious light through the second input port.

[0156] Optionally, the protection device receives switching strategy information from the control device, which is used to indicate the switching strategy of the protection device when a fiber optic path failure is detected.

[0157] The handover strategy information includes at least one of the following: If the first input port detects a first spurious light and the second input port detects a second service light, then if the optical power of the second service light is less than or equal to a first threshold, the first spurious light is received through the first input port, and the reception of the second service light is stopped; or, if the first input port detects a first service light and the second input port detects a second service light, then if the optical power of the first service light is less than or equal to the first threshold, the second service light is received through the second input port, and the reception of the first service light is stopped; or, if the first input port detects a first spurious light and the second input port detects a second spurious light, then if the optical power of the detected first spurious light meets a first condition, the second spurious light is received through the second input port, and the reception of the first spurious light is stopped. For an explanation of the handover strategy information, please refer to the previous embodiments; it will not be repeated here.

[0158] Furthermore, embodiments of this application also provide a device 60, such as... Figure 6 As shown, Figure 6 This is a schematic diagram of the structure of a device 60 provided in an embodiment of this application. Figure 2A , Figure 2B , Figure 2C , Figure 3A , Figure 3B , Figure 3C , Figure 3D or Figure 5 The specific implementation of the protection device in the illustrated embodiment can be found by referring to Figure 6 The internal structure of the device 60 shown.

[0159] like Figure 6 As shown, the device 60 includes an interface module 601, a detection module 602, and a processing module 603. The interface module 601 receives optical signals through a first input port or through a second input port. The detection module 602 detects the type and / or optical power of the optical signal received through the first input port, and detects the type and / or optical power of the optical signal received through the second input port. The processing module 603 controls the interface module 601 to receive the first service light through the first input port when the detection module 602 detects that the first input port is for a first service light and the second input port is for a second service light, wherein the first service light and the second service light carry the same service information. Furthermore, the processing module 603 also controls the interface module 601 to receive the second service light through the second input port and stops receiving the first service light when the detection module 602 detects that the optical power of the first service light is less than or equal to a first threshold. In addition, the processing module 603 is also used to control the interface module 601 to receive the first dummy light through the first input port when the detection module 602 detects that the first input port is the first dummy light and the second input port is the second service light, and the optical power of the second service light is less than or equal to the first threshold. In this case, the control interface module 601 stops receiving the second service light. The first dummy light does not carry service information and has the same wavelength as the first service light.

[0160] In one possible implementation, the processing module 603 is further configured to, when the detection module 602 detects that the first input port is the first dummy light, the second input port is the second dummy light, and the optical power of the first dummy light meets the first condition, control the interface module 601 to receive the second dummy light through the second input port, and control the interface module 601 to stop receiving the first dummy light; the first condition includes at least one of the following: the optical power of the first dummy light is less than or equal to a third threshold; or, the drop in the optical power of the first dummy light is greater than or equal to a fourth threshold.

[0161] In one possible implementation, the processing module 603 is further configured to, when the detection module 602 detects that the first input port is the first service light and the optical power of the first service is greater than or equal to a fifth threshold, control the interface module 601 to receive the first service light through the first input port and control the interface module 601 to stop receiving optical signals through the second input port.

[0162] In one possible implementation, the interface module 601 is further configured to receive switching strategy information from the control device, the switching strategy information being used to indicate the switching strategy of the device 60 when a fiber optic path failure is detected.

[0163] In one possible implementation, the switching strategy information includes at least one of the following:

[0164] If the first input port detects a first spurious light, and the second input port detects a second service light, then if the optical power of the second service light is less than or equal to a first threshold, the first spurious light is received through the first input port, and the reception of the second service light is stopped; or...

[0165] If the first input port detects the first service light, and the second input port detects the second service light, then if the optical power of the first service light is less than or equal to a first threshold, the second service light is received through the second input port, and the reception of the first service light is stopped; or...

[0166] If the first input port detects the first spurious light and the second input port detects the second spurious light, then if the optical power of the detected first spurious light meets the first condition, the second spurious light is received through the second input port, and the reception of the first spurious light is stopped.

[0167] It should be noted that there are many other specific implementation methods in this application, which can be found in the foregoing text. Figure 5 The specific implementation methods and beneficial effects of the corresponding embodiments will not be repeated here.

[0168] Furthermore, embodiments of this application also provide a device 70, such as... Figure 7 As shown, Figure 7 This is a schematic diagram of the structure of a device 70 provided in an embodiment of this application. Figure 5 The specific implementation of the protection device in the flowchart shown can be found by referring to... Figure 7 The internal structure of device 70 is shown. Device 70 can be an optical fiber line auto switch protection device (OLP) or other devices with optical fiber path protection functions. In some scenarios, OLP is also referred to as a hitless optical switch.

[0169] like Figure 7As shown, the device 70 may include a processor 701 and a communication interface 702, with the processor 701 coupled to the communication interface 702. The processor 701 may be a central processing unit (CPU), an application-specific integrated circuit (ASIC), a programmable logic device (PLD), or a combination thereof. The PLD may be a complex programmable logic device (CPLD), a field-programmable gate array (FPGA), a generic array logic (GAL), or any combination thereof. The processor 701 may refer to a single processor or may include multiple processors; no specific limitation is made here.

[0170] The aforementioned communication interface 702 includes an optical signal input port and an optical signal output port. The optical signal input port is used to receive optical signals, such as the first input port and the second input port described above. The optical signal output port is used to transmit the received optical signals downstream. In addition, the communication interface 702 also includes an electrical port for receiving switching strategy information from the control device.

[0171] Optionally, the device 70 further includes a memory 703. The processor 701 is coupled to the memory 703. The memory 703 is primarily used to store software programs and data. The memory 703 can exist independently, connected to the processor 701. Optionally, the memory 703 can be integrated with the processor 701, for example, integrated within one or more chips. The memory 703 can store program code that executes the technical solutions of the embodiments of this application, and its execution is controlled by the processor 701. The various types of computer program code being executed can also be considered as drivers for the processor 701. The memory 703 can include volatile memory, such as random-access memory (RAM); the memory can also include non-volatile memory, such as read-only memory (ROM), flash memory; the memory 703 can also include combinations of the above types of memory. The memory 703 can refer to a single memory or can include multiple memories. For example, the memory 703 is used to store various types of data. For example, memory 703 is used to store switching strategy information. As another example, memory 703 is used to store a first threshold, a third threshold, a fourth threshold, or a fifth threshold.

[0172] In one implementation, the device 70 is used to implement Figure 5 The corresponding method embodiment describes the function of the protection device. Specifically, the processor 701 is configured to, when the first input port is the first service light and the second input port is the second service light, control the communication interface 702 to receive the first service light through the first input port, wherein the first service light and the second service light carry the same service information. Furthermore, the processor 701 is also configured to, when the optical power of the first service light is less than or equal to a first threshold, control the communication interface 702 to receive the second service light through the second input port, and control the communication interface 702 to stop receiving the first service light. Additionally, the processor 701 is also configured to, when the first input port is the first dummy light, the second input port is the second service light, and the optical power of the second service light is less than or equal to the first threshold, control the communication interface 702 to receive the first dummy light through the first input port, and control the communication interface 702 to stop receiving the second service light; the first dummy light does not carry service information, and the first dummy light has the same wavelength as the first service light.

[0173] For details regarding other functions and beneficial effects of the protection device, please refer to the relevant descriptions in the preceding embodiments, which will not be repeated here.

[0174] Furthermore, this application provides a computer program product comprising one or more computer instructions. When these computer program instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of this application are generated. For example, implementing the aforementioned... Figure 5 Methods related to the protection device in the system. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium that a computer can store or a data storage device such as a server or data center that integrates one or more available media. The available medium can be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., digital versatile disc (DVD)), or a semiconductor medium (e.g., solid-state disk (SSD)).

[0175] Furthermore, this application also provides a computer-readable storage medium storing a computer program that is executed by a processor to perform the aforementioned functions. Figure 5 Methods related to protective devices in [the system].

[0176] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0177] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. An optical communication system, characterized in that, include: A first dummy optical access device and a protection device; the first input port and the second input port of the protection device are respectively connected to a first optical fiber path and a second optical fiber path, the first optical fiber path is used to transmit a first service optical light, the second optical fiber path is used to transmit a second service optical light, the second service optical light carries the same service information as the first service optical light; the first dummy optical access device is provided on the first optical fiber path. The first dummy light access device is used to control the transmission of the first service light to the protection device when the first optical fiber path is fault-free, and to block the transmission of the first dummy light to the protection device. The first dummy light has the same wavelength as the first service light, and the first dummy light does not carry the service information. The protection device is configured to receive the first service light through the first input port, and when a fault is detected in the first optical fiber path, receive the second service light from the second optical fiber path through the second input port, and stop receiving the first service light. The first dummy optical access device is further configured to, when a fault is detected in the first optical fiber path, control the transmission of the first dummy optical light to the protection device, and block the transmission of the first service optical light to the protection device; The protection device is further configured to, in the event of a second optical fiber path failure, receive the first dummy light from the first dummy light access device through the first input port, and stop receiving the second service light.

2. The optical communication system according to claim 1, characterized in that, The protection device is specifically used to determine the first optical fiber path fault when the optical power of the first service light is detected to be less than or equal to a first threshold. The protection device is specifically used to determine the second optical fiber path fault when the optical power of the second service light is detected to be less than or equal to the first threshold.

3. The optical communication system according to claim 1 or 2, characterized in that, The first dummy optical access device is specifically used to determine the first optical fiber path fault when the detected drop in the optical power of the first service light is greater than or equal to a second threshold.

4. The optical communication system according to any one of claims 1 to 3, characterized in that, The optical communication system further includes a second dummy optical access device, which is provided on the second optical fiber path. The second dummy light access device is used to control the transmission of the second service light to the protection device when the second optical fiber path is fault-free, and to block the transmission of the second dummy light to the protection device. The second dummy light has the same wavelength as the second service light, and the second dummy light does not carry the service information.

5. The optical communication system according to claim 4, characterized in that, The protection device is further configured to, when the optical power of the first dummy light detected at the first input port meets the first condition, receive the second dummy light from the second dummy light access device through the second input port, and stop receiving the first dummy light from the first dummy light access device; The first condition includes at least one of the following: The optical power of the first dummy light is less than or equal to the third threshold; or, the drop in the optical power of the first dummy light is greater than or equal to the fourth threshold.

6. The optical communication system according to any one of claims 1 to 5, characterized in that, The protection device is further configured to receive the first service light through the first input port and stop receiving optical signals through the second input port when the optical power of the first service light is detected to be greater than or equal to a fifth threshold.

7. The optical communication system according to claim 2, characterized in that, The first service light includes a first band optical signal and a second band optical signal, and the second service light includes the first band optical signal and the second band optical signal. The wavelength range of the first band optical signal and the wavelength range of the second band optical signal do not overlap. The optical power of the first service light is less than or equal to the first threshold, including: the optical power of the first band optical signal in the first service light is less than or equal to the first threshold, and / or, the optical power of the second band optical signal in the first service light is less than or equal to the first threshold; The optical power of the second service light being less than or equal to the first threshold includes: the optical power of the first band optical signal in the second service light being less than or equal to the first threshold, and / or, the optical power of the second band optical signal in the second service light being less than or equal to the first threshold.

8. The optical communication system according to claim 7, characterized in that, The drop in optical power of the first service light is greater than or equal to the second threshold, including: the drop in optical power of the first band optical signal in the first service light is greater than or equal to the second threshold, and / or, the drop in optical power of the second band optical signal in the first service light is greater than or equal to the second threshold.

9. The optical communication system according to any one of claims 1 to 8, characterized in that, The optical communication system also includes a control device. The control device is used to send switching strategy information to the protection device, the switching strategy information being used to instruct the protection device on the switching strategy when a fiber optic path fault is detected.

10. The optical communication system according to claim 9, characterized in that, The switching strategy information includes at least one of the following: If the optical power of the first service light is less than or equal to the first threshold, then the second service light is received through the second input port, and the reception of the first service light is stopped. or, If the optical power of the second service light is less than or equal to the first threshold, then the first dummy light is received through the first input port, and the reception of the second service light is stopped. or, If the optical power of the first dummy light meets the first condition, then the second dummy light is received through the second input port, and the reception of the first dummy light is stopped; or, If the optical power of the first service light is greater than or equal to the fifth threshold, then the first service light is received through the first input port, and the reception of optical signals through the second input port is stopped.

11. An optical signal control method, applied in a protection device in an optical communication system, wherein a first input port and a second input port of the protection device are respectively connected to a first optical fiber path and a second optical fiber path, the first optical fiber path is used to transmit a first service light, the second optical fiber path is used to transmit a second service light, and the second service light carries the same service information as the first service light; A first dummy light access device for emitting a first dummy light is provided on the first optical fiber path, characterized in that it includes: If the first service light is detected at the first input port, and the second service light is detected at the second input port, then the first service light is received through the first input port; If the optical power of the first service light is less than or equal to the first threshold, then the second service light is received through the second input port, and the reception of the first service light is stopped. If the first spurious light is detected at the first input port, the second service light is detected at the second input port, and the optical power of the second service light is less than or equal to the first threshold, then the first spurious light is received through the first input port, and the reception of the second service light is stopped. The first spurious light does not carry service information, and the first spurious light and the first service light have the same wavelength.

12. The method according to claim 11, characterized in that, The second optical fiber path is equipped with a second dummy light access device for emitting a second dummy light, and the method further includes: If the first spurious light is detected at the first input port, the second spurious light is detected at the second input port, and the optical power of the first spurious light satisfies the first condition, then the second spurious light is received through the second input port, and the reception of the first spurious light is stopped. The first condition includes at least one of the following: The optical power of the first dummy light is less than or equal to the third threshold; or, the drop in the optical power of the first dummy light is greater than or equal to the fourth threshold.

13. The method according to claim 12, characterized in that, The method further includes: If the first service light is detected at the first input port, and the optical power of the first service is greater than or equal to the fifth threshold, then the first service light is received through the first input port, and the reception of optical signals through the second input port is stopped.

14. The method according to any one of claims 11 to 13, characterized in that, The method further includes: The protection device receives switching strategy information from the control device, which is used to indicate the switching strategy when the fiber optic path fault is detected.

15. The method according to claim 14, characterized in that, The switching strategy information includes at least one of the following: If the optical power of the first service light is less than or equal to the first threshold, then the second service light is received through the second input port, and the reception of the first service light is stopped. or, If the optical power of the second service light is less than or equal to the first threshold, then the first dummy light is received through the first input port, and the reception of the second service light is stopped. or, If the optical power of the first dummy light meets the first condition, then the second dummy light is received through the second input port, and the reception of the first dummy light is stopped; or, If the optical power of the first service light is greater than or equal to the fifth threshold, then the first service light is received through the first input port, and the reception of optical signals through the second input port is stopped.

16. A protective device, characterized in that, include: Interface module, detection module, and processing module; The detection module is used to detect the optical signal received at the first input port and / or the optical signal received at the second input port; The processing module is configured to control the interface module to receive the first service light through the first input port when the detection module detects that the first input port is the first service light and the second input port is the second service light, wherein the first service light and the second service light carry the same service information; The processing module is further configured to, when the detection module detects that the optical power of the first service light is less than or equal to a first threshold, control the interface module to receive the second service light through the second input port, and control the interface module to stop receiving the first service light; The processing module is further configured to, when the detection module detects that the first input port is the first dummy light and the second input port is the second service light, and when the optical power of the second service light is less than or equal to a first threshold, control the interface module to receive the first dummy light through the first input port, and control the interface module to stop receiving the second service light, wherein the first dummy light does not carry service information and the first dummy light and the first service light have the same wavelength band.

17. The protection device according to claim 16, characterized in that, The processing module is further configured to, when the detection module detects that the first input port is the first dummy light, the second input port is the second dummy light, and the optical power of the first dummy light meets the first condition, control the interface module to receive the second dummy light through the second input port, and control the interface module to stop receiving the first dummy light; The first condition includes at least one of the following: The optical power of the first dummy light is less than or equal to the third threshold; or, the drop in the optical power of the first dummy light is greater than or equal to the fourth threshold.

18. The protection device according to claim 17, characterized in that, The processing module is further configured to, when the detection module detects that the first input port is the first service light and the optical power of the first service is greater than or equal to a fifth threshold, control the interface module to receive the first service light through the first input port, and control the interface module to stop receiving optical signals through the second input port.

19. The protective device according to any one of claims 16 to 18, characterized in that, The interface module is also used to receive switching strategy information from the control device, which is used to indicate the switching strategy of the protection device when it detects a fiber optic path fault.

20. The protection device according to claim 19, characterized in that, The switching strategy information includes at least one of the following: If the optical power of the first service light is less than or equal to the first threshold, then the second service light is received through the second input port, and the reception of the first service light is stopped. or, If the optical power of the second service light is less than or equal to the first threshold, then the first dummy light is received through the first input port, and the reception of the second service light is stopped. or, If the optical power of the first dummy light meets the first condition, then the second dummy light is received through the second input port, and the reception of the first dummy light is stopped; or, If the optical power of the first service light is greater than or equal to the fifth threshold, then the first service light is received through the first input port, and the reception of optical signals through the second input port is stopped.

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