A noise wave automatic filling method and device for a C+L transmission system

Abstract

The application discloses a C+L transmission system noise wave automatic filling method and device, relates to the optical communication technical field, and the C+L transmission system noise wave automatic filling method comprises the following steps: if the power of the optical amplifier of the downstream station of the C+L transmission system is abnormal, then starting optical channel monitoring OCM scanning, acquiring the frequency and power information of the missing channel; based on the frequency and power information of the missing channel, starting the automatic filling of the noise wave.The application can maintain the stability of the service channel of the C+L transmission system in the dynamic process.

Description

Technical Field

[0001] This application relates to the field of optical communication technology, specifically to a method and apparatus for automatic noise filling in a C+L transmission system. Background Technology

[0002] With the continuous growth of network traffic, higher requirements have been placed on the transmission rate and performance of transmission networks. In recent years, expanding the spectrum used by optical fibers to increase the capacity of a single fiber has been the most effective way to solve the problem of the year-on-year increase in network traffic. Currently, optical transmission systems have expanded from the traditional C-band 80 / 96-band systems to 120-band systems. The industry is constantly expanding the scope of C-band spectrum use, which has improved transmission capacity and transmission distance.

[0003] However, with the continuous emergence of technologies such as 5G, cloud computing, and big data, especially the high-load growth of DCI traffic, higher demands are being placed on transmission capacity, requiring further expansion of the optical spectrum into the C+L band. Particularly with the maturity of 400G long-distance transmission technology, using 400G QPSK and 400G PCS-16QAM coding schemes, to meet the transmission capacity of 80 wavelengths, the channel spacing required is larger (not less than 80*100GHz). This necessitates further expanding the available spectrum bandwidth beyond the C band to utilize the optical spectrum resources of the L band, forming a C+L optical system. If maintaining the 80-wavelength requirement is still necessary, such as… Figure 1 The diagram shows that the 400GPCS-16QAM code requires the C96+L96 band spectrum, while the 400G QPSK code requires the C120+L120 band spectrum.

[0004] Quartz optical fiber has a wide SRS (Stimulated Raman Scattering) gain spectrum, with a relatively broad gain peak around 13 THz (100 nm) below the pump light frequency. If a weak signal and a strong pump light wave propagate simultaneously in the fiber, and the wavelength of the weak signal is placed within the Raman gain bandwidth of the pump light, the weak signal light can be amplified.

[0005] In a C+L band transmission system, the L band falls within the Raman gain spectrum of the C band. This causes energy transfer from the C band signal to the L band, resulting in a significant power difference. Figure 2 As shown, compared to a pure C-band, the increased wavenumber and wider band width lead to a more pronounced SRS effect, resulting in more significant shortwave power degradation. Therefore, in the C+L spectrum extension scheme, utilizing SRS control technology to suppress the SRS effect is one of the key technologies for ensuring system performance.

[0006] In C+L transmission systems, for ordinary single-mode fiber spans of approximately 60–100 km, considering differences in fiber attenuation coefficients and the SRS power transfer effect, the average power of the C-band is generally about 1–1.5 dB higher than that of the L-band to achieve a balanced average OSNR. This means that if a traditional expansion mode is adopted, where each expansion only adds the required service channels, then each service expansion requires a system optimization, i.e., a reconfiguration adjustment of the entire line system. Figure 3 As shown.

[0007] This poses a significant challenge to the stability of the entire system, as the system optimization process will inevitably impact the wavelength of the original services. By employing noise filling, the optical layer line system maintains full-wavelength operation from the outset of service activation and continues this operation throughout its lifecycle. When service channel expansion is required, one filler channel is sequentially shut down to initiate a service channel of the same wavelength. This ensures the system remains in a relatively stable state, preventing existing services from being affected by SRS changes due to service additions or subtractions. Figure 4 As shown in the figure (solid lines represent the actual waveform, and dashed lines represent the noise waveform).

[0008] However, static noise filling can only make the system relatively stable. Optical transmission lines and systems are always absolutely dynamic. If noise filling is not performed on lost channels in time, it will still affect the remaining channels. Summary of the Invention

[0009] This application provides a method and apparatus for automatic noise filling in a C+L transmission system, which enables the C+L transmission system to maintain the stability of the service channel during dynamic processes.

[0010] In a first aspect, embodiments of this application provide an automatic noise filling method for a C+L transmission system, the automatic noise filling method for a C+L transmission system comprising the following steps:

[0011] If the power of the optical amplifier at the downstream site of the C+L transmission system is abnormal, then the optical channel monitoring (OCM) scan is initiated to obtain the frequency and power information of the missing channel.

[0012] Based on the missing channel frequency and power information, automatic noise filling is initiated.

[0013] In conjunction with the first aspect, in one embodiment, the power anomaly of the optical amplifier includes: the optical amplifier experiencing an input light loss alarm or a sudden change in output power.

[0014] In conjunction with the first aspect, in one implementation, if the optical amplifier at a downstream site of the C+L transmission system experiences an input light loss alarm, an optical channel monitoring (OCM) scan is initiated to obtain the frequency and power information of the missing channel, including:

[0015] When the power of the optical amplifier is detected to be close to 0, an input light loss alarm is triggered, indicating that the optical fiber is interrupted; an OCM scan is initiated to detect the channel within the full bandwidth of C+L and to identify the channel power and center frequency.

[0016] The center frequency of the acquired channel is compared with the preset center frequency of the entire channel. If there is a missing channel, the frequency and power information of the missing channel are recorded.

[0017] In conjunction with the first aspect, in one implementation, if the optical amplifier at a downstream site of the C+L transmission system experiences a sudden change in output power, an optical channel monitoring (OCM) scan is initiated to obtain the frequency and power information of the missing channel, including:

[0018] When the power of the optical amplifier suddenly increases or decreases but does not become zero, it is determined that the service channel is lost.

[0019] Initiate OCM scanning to detect and identify the channel power and center frequency within the full bandwidth of C+L.

[0020] The center frequency of the acquired channel is compared with the preset center frequency of the entire channel. If there is a missing channel, the frequency and power information of the missing channel are recorded.

[0021] In conjunction with the first aspect, in one implementation, initiating automatic noise filling based on the missing channel frequency and power information includes:

[0022] Based on the missing channel frequency and power information, the corresponding wavelength center frequency and bandwidth are opened at the port of the multiplexing optical device, and channel attenuation is set to match the frequency and power of the service channel before it was lost.

[0023] In conjunction with the first aspect, in one implementation, after initiating automatic noise filling based on the missing channel frequency and power information, the method further includes:

[0024] Send a query confirmation command to the optical amplifier to determine whether the input light loss alarm or output power sudden change of the optical amplifier has recovered to the state before the fault.

[0025] After receiving a reply, switch back to the port before the fault and perform an OCM scan. If the channel power is normal, stop noise filling; if the channel power is abnormal, continue noise filling.

[0026] Secondly, embodiments of this application provide an automatic noise filling device for a C+L transmission system, the automatic noise filling device for a C+L transmission system comprising:

[0027] The detection module is used to: if the power of the optical amplifier at the downstream site of the C+L transmission system is abnormal, initiate an optical channel monitoring (OCM) scan to obtain the frequency and power information of the missing channel.

[0028] The filling module initiates automatic noise filling based on the frequency and power information of the missing channel.

[0029] In conjunction with the second aspect, in one embodiment, the power anomaly of the optical amplifier includes: the optical amplifier experiencing an input light loss alarm or a sudden change in output power.

[0030] In conjunction with the second aspect, in one embodiment, the detection module is used to: if an input light loss alarm occurs in the optical amplifier of a downstream site of the C+L transmission system, initiate an optical channel monitoring (OCM) scan to obtain the frequency and power information of the missing channel, including:

[0031] When the power of the optical amplifier is detected to be close to 0, an input light loss alarm is triggered, indicating that the optical fiber is interrupted.

[0032] Initiate OCM scanning to detect and identify the channel power and center frequency within the full bandwidth of C+L.

[0033] The center frequency of the acquired channel is compared with the preset center frequency of the entire channel. If there is a missing channel, the frequency and power information of the missing channel are recorded.

[0034] In conjunction with the second aspect, in one embodiment, the detection module is used to: if a sudden change in output power occurs in the optical amplifier of a downstream site of the C+L transmission system, initiate an optical channel monitoring (OCM) scan to obtain the frequency and power information of the missing channel, including:

[0035] When the power of the optical amplifier suddenly increases or decreases but does not become zero, it is determined that the service channel is lost.

[0036] Initiate OCM scanning to detect and identify the channel power and center frequency within the full bandwidth of C+L.

[0037] The center frequency of the acquired channel is compared with the preset center frequency of the entire channel. If there is a missing channel, the frequency and power information of the missing channel are recorded.

[0038] The beneficial effects of the technical solutions provided in this application include at least the following:

[0039] If the power of the optical amplifier at the downstream site of the C+L transmission system is abnormal, the optical channel monitoring (OCM) scan is initiated to obtain the frequency and power information of the missing channel; based on the frequency and power information of the missing channel, automatic noise filling is initiated.

[0040] It is understandable that optical transmission lines and systems are always absolutely dynamic. When the optical cable is interrupted or the signal source board malfunctions, the signal channel will be lost. Since traditional noise filling mainly uses static filling methods, it does not have automatic noise filling for fiber breakage and dropped signals. However, the solution in this application determines fiber breakage through optical amplifier LOS alarm and service channel drop through optical amplifier power jitter, thereby triggering OCM scanning to identify the lost service channel and controlling the relevant equipment to fill the noise. This is a dynamic noise filling technology that enables the C+L transmission system to maintain the stability of the service channel in a dynamic process. At the same time, compared with the traditional static noise filling method, it adds OCM intervention scanning and service channel loss identification, thereby accurately distinguishing the service channel and the noise channel for accurate filling. Attached Figure Description

[0041] Figure 1 For C+L transmission system spectrum;

[0042] Figure 2 A schematic diagram of the SRS effect in a C+L transmission system;

[0043] Figure 3 A schematic diagram illustrating the expansion and upgrade of a traditional C+L transmission system;

[0044] Figure 4 This is a schematic diagram of the capacity expansion and upgrade of a C+L transmission system using noise filling.

[0045] Figure 5 This is a flowchart illustrating an embodiment of the automatic noise filling method for C+L transmission systems according to this application.

[0046] Figure 6 This is a schematic diagram of the automatic fill control based on fiber optic interruption triggering in this application;

[0047] Figure 7 This is a schematic diagram of the automatic fill control based on power change triggering in this application;

[0048] Figure 8 A schematic diagram illustrating a hardware integration function for implementing rapid filling in this application;

[0049] Figure 9 This is a structural block diagram of an embodiment of the automatic noise filling device for the C+L transmission system of this application. Detailed Implementation

[0050] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0051] The terms "comprising" and "having," and any variations thereof, in the specification, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such process, method, product, or apparatus. The terms "first," "second," and "third," etc., are used to distinguish different objects, etc., and do not indicate a sequence, nor do they limit "first," "second," and "third" to different types.

[0052] In the description of the embodiments of this application, terms such as "exemplary," "for example," or "for instance" are used to indicate examples, illustrations, or explanations. Any embodiment or design described as "exemplary," "for example," or "for instance" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of terms such as "exemplary," "for example," or "for instance" is intended to present the relevant concepts in a concrete manner.

[0053] In the description of the embodiments of this application, unless otherwise stated, " / " means "or". For example, A / B can mean A or B. The "and / or" in the text is merely a description of the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, and B exists alone. In addition, in the description of the embodiments of this application, "multiple" means two or more.

[0054] In some processes described in the embodiments of this application, multiple operations or steps are included in a specific order. However, it should be understood that these operations or steps may not be executed in the order they appear in the embodiments of this application, or they may be executed in parallel. The sequence number of the operation is only used to distinguish different operations, and the sequence number itself does not represent any execution order. In addition, these processes may include more or fewer operations, and these operations or steps may be executed sequentially or in parallel, and these operations or steps may be combined.

[0055] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0056] In a first aspect, embodiments of this application provide a method for identifying risks associated with the same cable in an OTDR.

[0057] In one embodiment, reference is made to Figure 5 , Figure 5 This is a flowchart illustrating the first embodiment of the OTDR co-channel risk identification method of this application. Figure 5 As shown, the methods for identifying risks associated with OTDR co-channels include:

[0058] S1. If the power of the optical amplifier at the downstream site of the C+L transmission system is abnormal, then initiate the optical channel monitoring (OCM) scan to obtain the frequency and power information of the missing channel.

[0059] S2. Based on the missing channel frequency and power information, initiate automatic noise filling.

[0060] It is worth noting that 400G transmission systems currently generally use noise filling to keep the optical layer line system in full-wavelength operation from the beginning of service activation and throughout the entire life cycle. When it is necessary to expand the service channels, one filling channel is closed in sequence to bring up a service channel of the same wavelength. This allows the system to always remain in a relatively stable state and avoids the impact of adding or removing services on existing services.

[0061] However, in practical engineering applications, transmission links cannot be static. At the same time, the diversity of services will inevitably lead to the existence of serial communication channels. Therefore, ensuring the stability of the system when serial communication channels are present is crucial. When a serial communication channel fails or the optical cable between upstream sites of a serial communication station is interrupted, the downstream power will drop significantly and affect the service, resulting in damage to the entire link.

[0062] If the cross-channel can be automatically monitored and the noise wave can be refilled at the transmitting end of the cross-channel station, the corresponding power oscillation on the downstream line can be greatly reduced. This will only affect the service between the upstream station and the cross-channel station, and will not affect the service sent downstream from the cross-channel station.

[0063] To address this, this application focuses on power anomalies in optical amplifiers. Specifically, power anomalies in optical amplifiers include receiving a signal loss (LOS) alarm or experiencing sudden changes in output power. This application determines fiber breakage through optical amplifier LOS alarms and service channel drop through optical amplifier power jitter, thereby triggering OCM scanning to identify lost service channels and controlling related equipment to fill noise, enabling the C+L transmission system to maintain service channel stability during dynamic processes.

[0064] The following sections will introduce two aspects: automatic fill control based on fiber optic interruption triggering and automatic fill control based on power change triggering.

[0065] Automatic fill control based on fiber optic interruption triggering:

[0066] Upstream and downstream sites transmit signals via optical fiber. After receiving the signal from the upstream site, the downstream site needs to amplify the signal through an optical amplifier. When the optical fiber is interrupted or the optical fiber in the upstream rack is interrupted, the C or L optical amplifiers received by the downstream site will both trigger an input light loss alarm.

[0067] At this time, if the optical amplifier at the downstream site of the C+L transmission system receives a signal loss (LOS) alarm, it will initiate an optical channel monitoring (OCM) scan to obtain the frequency and power information of the missing channel, including:

[0068] Configure the communication path and handshake mechanism between the fiber optic interruption alarm trigger board and the detection board, and configure the communication path and handshake mechanism between the detection board and the noise wave filling board.

[0069] When the power of the optical amplifier is detected to be close to 0, an input light loss alarm is triggered, indicating a fiber optic cable breakage. Once the fiber optic cable breakage alarm trigger board detects the breakage, it sends information to the detection board, initiating an OCM scan to detect the channel within the full bandwidth of the C+L band and determine the channel's power and center frequency.

[0070] The center frequency of the acquired channel is compared with the preset center frequency of the entire channel. If there is a missing channel, the frequency and power information of the missing channel are recorded and sent to the noise wave filling board.

[0071] Finally, based on the missing channel frequency and power information, the noise wave filling board is used to initiate automatic noise wave filling, and the corresponding center frequency, bandwidth, and channel attenuation are set. It is worth noting that after the multiplexing optical device opens the corresponding wavelength ports, the attenuation set in the original signal still needs to be included in the noise wave to achieve overall power stability.

[0072] Furthermore, when the optical cable interruption is repaired or the OTU board is replaced and the service channel is restored, the port is still filled with noise, so the restored service channel cannot be automatically scanned from the OCM. At this time, it is necessary to re-determine whether the alarm or power of the optical amplifier has been restored to the state before the fault. At this time, the noise filling disk sends a query confirmation command to the optical amplifier. After receiving the reply, it will switch back to the port before the fault and immediately perform an OCM scan. If the channel power is normal at this time, no action will be taken. If the channel power is abnormal, noise filling will continue.

[0073] For ease of understanding, see [link to relevant documentation]. Figure 6As shown, when the optical amplifier C or L in the receiving direction of the ROADM-B station experiences no light input, a LOS alarm (LOS1) will be generated. This indicates that the upstream optical fiber to this station or the optical fiber within the station is interrupted. If the optical fiber is interrupted, both the C and L amplifiers will generate LOS alarms. If only the C or L amplifier generates a LOS alarm, it can be determined that the fiber within the rack is interrupted or that the entire upstream C or L band is faulty. At this time, the OPM / OCM port connected to the transmitting end is triggered to scan the wavelength and power information. After obtaining the lost wavelength, it informs the WSS transmitting end to automatically fill in the noise.

[0074] If an optical fiber interruption occurs in the east direction, the situation is the same as described above. The LOS alarm of the receiving east-facing optical amplifier single board will serve as the trigger source for OCM sweep and WSS automatic filling operations.

[0075] When the LOS alarm disappears, repeat the above operation, and the corresponding single disk will notify the WSS to cancel the noise wave filling and restore it to the initial state.

[0076] Automatic filling control based on power change triggering:

[0077] The triggering of power changes differs from the cause of LOS alarms. Power changes may simply be due to a fault in an OTU board or a fault in an upstream board or some other equipment, rather than an interruption of the fiber optic cable, resulting in a smaller number of dropped signals. The downstream optical amplifier receiving signals from the upstream site is in a locked state and there are no alarms.

[0078] At this point, if the output power of the optical amplifier at the downstream site of the C+L transmission system suddenly changes, an optical channel monitoring (OCM) scan is initiated to obtain the frequency and power information of the missing channel. For example, when a sudden increase or decrease in the power of the optical amplifier is detected but not zero (unlike when the power approaches zero during fiber optic interruption), the threshold for judging the sudden change can be set reasonably as needed, such as 3dB.

[0079] The specific implementation includes the following steps:

[0080] Configure the communication path and handshake mechanism between the power change trigger board and the detection board, and configure the communication path and handshake mechanism between the detection board and the noise wave filling board.

[0081] If the power change trigger board detects a sudden power change, it determines that the service channel is lost, sends information to the detection board, starts OCM scanning, detects the channel within the full bandwidth of C+L, and distinguishes the channel power and center frequency.

[0082] The center frequency of the acquired channel is compared with the preset center frequency of the entire channel. If there is a missing channel, the frequency and power information of the missing channel are recorded and sent to the noise wave filling board.

[0083] Finally, based on the frequency and power information of the missing channel, the corresponding wavelength center frequency and bandwidth are turned on at the port of the multiplexing optical device, and channel attenuation is set to match the frequency and power of the service channel before it was lost.

[0084] Based on the missing channel frequency and power information, an automatic noise filling board is used to fill in the noise, setting the corresponding center frequency, bandwidth, and channel attenuation. It's worth noting that even after opening the corresponding wavelength ports, the original signal attenuation settings must still be incorporated into the noise to ensure overall power stability.

[0085] For ease of understanding, see [link to relevant documentation]. Figure 7 As shown, when the optical amplifier C or L amplifier in the receiving direction of the ROADM-B station is in VOA locked and no alarm is generated, if a sudden change in power occurs, it can be determined that the upstream transmission line channel to this station has an anomaly. At this time, a certain power change threshold (such as 3dB) can be used as a trigger to notify the OPM / OCM port connected to the transmitting end to scan the wavelength and power information. After obtaining the wavelength and power information, the channel with dropped waves can be determined, and the WSS single-board transmitting end can be notified to automatically fill the noise wave.

[0086] If the optical power changes in the eastward direction, the same situation applies as described above. The power change threshold of the receiving eastward amplification single disk is used as the trigger source to perform OCM sweep and WSS automatic filling operations at the transmitting end.

[0087] It's worth noting that in a C+L transmission system, separate boards can achieve corresponding automatic noise filling control and management capabilities. However, when ultra-fast automatic noise filling control is required, the separate single boards need to send commands from the trigger board to the execution board during coordination. This involves waiting and negotiation, and these commands may also need to be forwarded by the device's main controller. Therefore, the time required is considerable, making ultra-high-speed control difficult. In such cases, these necessary functions can be integrated into a single card to achieve rapid automatic filling control. See details below. Figure 8 As shown, it integrates WDM, VGA, WSS and OCM.

[0088] In summary, if the power of the optical amplifier at the downstream site of the C+L transmission system is abnormal, the optical channel monitoring (OCM) scan is initiated to obtain the frequency and power information of the missing channel; based on the frequency and power information of the missing channel, automatic noise filling is initiated.

[0089] It is understandable that optical transmission lines and systems are always absolutely dynamic. When the optical cable is interrupted or the signal source board malfunctions, the signal channel will be lost. Since traditional noise filling mainly uses static filling methods, it does not have automatic noise filling for fiber breakage and dropped signals. However, the solution in this application determines fiber breakage through optical amplifier LOS alarm and service channel drop through optical amplifier power jitter, thereby triggering OCM scanning to identify the lost service channel and controlling the relevant equipment to fill the noise. This is a dynamic noise filling technology that enables the C+L transmission system to maintain the stability of the service channel in a dynamic process. At the same time, compared with the traditional static noise filling method, it adds OCM intervention scanning and service channel loss identification, thereby accurately distinguishing the service channel and the noise channel for accurate filling.

[0090] Secondly, embodiments of this application also provide an automatic noise filling device for a C+L transmission system.

[0091] In one embodiment, reference is made to Figure 9 , Figure 9 This is a functional module diagram of an embodiment of the automatic noise filling device for a C+L transmission system according to this application. Figure 9 As shown, the automatic noise filling device for the C+L transmission system includes:

[0092] The detection module is used to: if the power of the optical amplifier at the downstream site of the C+L transmission system is abnormal, initiate an optical channel monitoring (OCM) scan to obtain the frequency and power information of the missing channel.

[0093] The filling module initiates automatic noise filling based on the frequency and power information of the missing channel.

[0094] Furthermore, in one embodiment, the power anomaly of the optical amplifier includes: the optical amplifier experiencing an input light loss alarm or a sudden change in output power.

[0095] Furthermore, in one embodiment, the detection module is used to: if an input light loss alarm occurs in the optical amplifier of a downstream site of the C+L transmission system, initiate an optical channel monitoring (OCM) scan to obtain the frequency and power information of the missing channel, including:

[0096] When the power of the optical amplifier is detected to be close to 0, an input light loss alarm is triggered, indicating that the optical fiber is interrupted.

[0097] Initiate OCM scanning to detect and identify the channel power and center frequency within the full bandwidth of C+L.

[0098] The center frequency of the acquired channel is compared with the preset center frequency of the entire channel. If there is a missing channel, the frequency and power information of the missing channel are recorded.

[0099] Further, in one embodiment, the detection module is used to: if the output power of the optical amplifier at a downstream site of the C+L transmission system suddenly changes, initiate an optical channel monitoring (OCM) scan to obtain the frequency and power information of the missing channel, including:

[0100] When the power of the optical amplifier suddenly increases or decreases but does not become zero, it is determined that the service channel is lost.

[0101] Initiate OCM scanning to detect and identify the channel power and center frequency within the full bandwidth of C+L.

[0102] The center frequency of the acquired channel is compared with the preset center frequency of the entire channel. If there is a missing channel, the frequency and power information of the missing channel are recorded.

[0103] Furthermore, in one embodiment, the filling module initiates automatic noise filling based on the frequency and power information of the missing channel, including:

[0104] Based on the missing channel frequency and power information, the corresponding wavelength center frequency and bandwidth are opened at the port of the multiplexing optical device, and channel attenuation is set to match the frequency and power of the service channel before it was lost.

[0105] Furthermore, in one embodiment, after initiating automatic noise filling based on the missing channel frequency and power information, the filling module is further configured to:

[0106] Send a query confirmation command to the optical amplifier to determine whether the input light loss alarm or output power sudden change of the optical amplifier has recovered to the state before the fault.

[0107] After receiving a reply, switch back to the port before the fault and perform an OCM scan. If the channel power is normal, stop noise filling; if the channel power is abnormal, continue noise filling.

[0108] The functions of each module in the above-mentioned automatic noise filling device for C+L transmission system correspond to the steps in the above-mentioned automatic noise filling method embodiment for C+L transmission system, and their functions and implementation processes will not be described in detail here.

[0109] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A method for automatically filling noise waves in a C+L transmission system, characterized in that, The automatic noise filling method for the C+L transmission system includes the following steps: If the power of the optical amplifier at the downstream site of the C+L transmission system is abnormal, then the optical channel monitoring (OCM) scan is initiated to obtain the frequency and power information of the missing channel. Based on the missing frequency and power information of the channel, automatic noise filling is initiated; The power anomalies of the optical amplifier include: the optical amplifier experiencing an input light loss alarm or a sudden change in output power; If the power of the optical amplifier at the downstream site of the C+L transmission system is abnormal, an optical channel monitoring (OCM) scan is initiated to obtain the frequency and power information of the missing channel, including: When the power of the optical amplifier is detected to be close to 0, an input light loss alarm is triggered, indicating that the optical fiber is interrupted. When the power of the optical amplifier suddenly increases or decreases but does not become zero, it is determined that the service channel is lost. Initiate OCM scanning to detect and identify the channel power and center frequency within the full bandwidth of C+L. The center frequency of the acquired channel is compared with the preset center frequency of the entire channel. If there is a missing channel, the frequency and power information of the missing channel are recorded.

2. The automatic noise filling method for a C+L transmission system as described in claim 1, characterized in that, The automatic noise filling based on the missing channel frequency and power information includes: Based on the missing channel frequency and power information, the corresponding wavelength center frequency and bandwidth are opened at the port of the multiplexing optical device, and channel attenuation is set to match the frequency and power of the service channel before it was lost.

3. The automatic noise filling method for a C+L transmission system as described in claim 1, characterized in that, After initiating automatic noise filling based on the missing channel frequency and power information, the method further includes: Send a query confirmation command to the optical amplifier to determine whether the input light loss alarm or output power sudden change of the optical amplifier has recovered to the state before the fault. After receiving a reply, switch back to the port before the fault and perform an OCM scan. If the channel power is normal, stop noise filling; if the channel power is abnormal, continue noise filling.

4. An automatic noise filling device for a C+L transmission system, characterized in that, The automatic noise filling device for the C+L transmission system includes: The detection module is used to: if the power of the optical amplifier at the downstream site of the C+L transmission system is abnormal, initiate an optical channel monitoring (OCM) scan to obtain the frequency and power information of the missing channel. The noise filling module initiates automatic noise filling based on the frequency and power information of the missing channel. The power anomalies of the optical amplifier include: the optical amplifier experiencing an input light loss alarm or a sudden change in output power; The detection module is used to: if the power of the optical amplifier at the downstream site of the C+L transmission system is abnormal, initiate an optical channel monitoring (OCM) scan to obtain the frequency and power information of the missing channel, including: When the power of the optical amplifier is detected to be close to 0, an input light loss alarm is triggered, indicating that the optical fiber is interrupted. When the power of the optical amplifier suddenly increases or decreases but does not become zero, it is determined that the service channel is lost. Initiate OCM scanning to detect and identify the channel power and center frequency within the full bandwidth of C+L. The center frequency of the acquired channel is compared with the preset center frequency of the entire channel. If there is a missing channel, the frequency and power information of the missing channel are recorded.

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