Method and apparatus for optical power flatness adjustment in a c+l optical transport network

Abstract

A method and device for adjusting optical power flatness of a C+L optical transport network, the method comprising: based on services of C-band and L-band optical power flatness exceeding a preset flatness threshold, grouping and flattening single-wave optical power of service originating of each band to obtain a first single-wave attenuation value required by each single-wave optical power; calculating gain slope of an amplifier in a full-wave state of each type of fiber in each band respectively; issuing the first single-wave attenuation value, the gain slope and the expected combined power of the amplifier of each band to the corresponding service source device respectively, and ending the adjustment if the optical power flatness of each service of the C-band and the L-band is within the corresponding preset flatness threshold. The adjustment of the C+L optical transport network in combination with the first single-wave attenuation value, the expected combined power, the actual combined power and the gain slope can quickly and effectively improve the optical power flatness of the C+L optical transport network.

Description

Technical Field

[0001] This application relates to the field of OTN equipment management technology, specifically to a method and apparatus for adjusting the optical power flatness of a C+L optical transmission network. Background Technology

[0002] In OTN (Optical Transport Network) fiber optic communication, optical power flatness is a crucial indicator for judging signal transmission quality. Optical power flatness typically represents the degree of difference in power distribution among optical signals of different frequencies during transmission; higher flatness indicates higher signal transmission quality. Uneven power distribution among optical signals of different frequencies during transmission leads to a decrease in the signal-to-noise ratio, thus affecting long-distance signal transmission performance. Therefore, appropriate measures need to be taken to reduce variations in optical power flatness.

[0003] In engineering practice, optical power flatness is typically adjusted by modifying single-wavelength power attenuators. However, existing flatness adjustments are primarily designed for C-band extended (C++) systems. In mixed C-band and L-band scenarios, due to the wavelength dependence of fiber attenuation and the SRS (Stimulated Raman Scattering) effect, the attenuation coefficients of C-band and L-band signals differ significantly. These differences accumulate over long distances, leading to a decrease in optical power flatness and consequently affecting signal transmission quality. In C+L mixed scenarios, the impact of the SRS effect is more pronounced than in C++ extended systems, making existing flatness adjustment systems ineffective in addressing this issue.

[0004] Specifically, the SRS effect in a transmission system causes energy to shift from short wavelengths to long wavelengths, and this energy transfer accumulates with increasing transmission distance. After passing through multiple segments, this leads to a severe imbalance in optical power and OSNR (Optical Signal-to-Noise Ratio) at the system's end. The SRS effect is closely related to the system's input fiber power and frequency bandwidth. C+L systems, due to their wider spectrum, exhibit a more pronounced and difficult-to-control SRS effect compared to traditional C-band systems. Summary of the Invention

[0005] This application provides a method and apparatus for adjusting the optical power flatness of a C+L optical transmission network, which can solve the technical problem of optical power imbalance caused by the SRS effect in the C+L optical transmission network.

[0006] To achieve the above objectives, in a first aspect, this application provides a method for adjusting the optical power flatness of a C+L optical transport network, the method comprising: For services where the optical power flatness of the C-band and L-band exceeds a preset flatness threshold, the single-wavelength optical power at the transmission end of the service in each band is grouped and flattened to obtain the first single-wavelength attenuation value required for each single-wavelength optical power.

[0007] Calculate the gain slope of the amplifier for each type of optical fiber in full-wave conditions in each band.

[0008] The first single-wave attenuation value, the gain slope, and the expected combined power of the amplifiers in each band are sent to the corresponding service source equipment. If the optical power flatness of each service in the C-band and L-band is within its respective preset flatness threshold, the adjustment ends.

[0009] Furthermore, in one embodiment, the method for calculating the optical power flatness in the C-band and L-band includes: Obtain the single-wavelength optical power of each service path in C-band and L-band.

[0010] Within each band, the optical power flatness of the corresponding service is calculated based on the single-wavelength optical power of the same type of service.

[0011] Furthermore, in one embodiment, the step of grouping and flattening the single-wavelength optical power of the service transmitter in each band to obtain the first single-wavelength attenuation value required for each single-wavelength optical power includes: Within each band, the single-wavelength optical power of the service originating from the service is grouped according to the service type.

[0012] In each group, the minimum single-wavelength optical power is used as the benchmark, and the first single-wavelength attenuation value required for each single-wavelength optical power is calculated in combination with the reserved attenuation value.

[0013] Furthermore, in one embodiment, the method for calculating the expected combined power of the amplifiers in each band includes: Based on the quantity of various services and the preset expected fiber input power, the expected combined power of C-band and L-band is calculated respectively.

[0014] When calculating the expected combined power of C-band or L-band, if the number of channels in the band is less than or equal to a preset threshold, a power bias is introduced for correction.

[0015] Furthermore, in one embodiment, the power bias value is determined based on the number of channels. When the number of channels is less than or equal to a first preset threshold, the first power bias value is increased. When the number of channels is greater than the first preset threshold and less than or equal to a second preset threshold, the second power bias value is increased.

[0016] The first preset threshold, the second preset threshold, the first power bias value, and the second power bias value are all calibrated based on the difference test experiment between the amplifier's expected combined power and the amplifier's pure signal combined power, and the first power bias value is greater than the second power bias value.

[0017] Furthermore, in one embodiment, the step of distributing the data to the corresponding service source devices includes: The first single-wave attenuation value, the gain slope, and the expected combined power of the amplifiers in each band are sent to the service source device and the success of the transmission is verified. If the transmission is successful, the corresponding service source device is configured. If not, the retransmission mechanism is started to retransmit the data. An error message is displayed when the number of retransmissions exceeds the preset retransmission threshold.

[0018] Furthermore, in one embodiment, the step of distributing the data to the corresponding service source devices includes: If there are two amplifier stages in the business path, set the gain slope of the first amplifier to 0.

[0019] Furthermore, in one embodiment, the first single-wave attenuation value, the gain slope, and the expected combined power of the amplifiers in each band are respectively sent to the corresponding service source equipment. If there are still services in the C-band and L-band whose optical power flatness exceeds their respective preset flatness thresholds: In each band, the average optical power is calculated based on the single-wavelength optical power at the transmitting and receiving ends of the corresponding service, and the second single-wavelength attenuation value is calculated in conjunction with the preset expected fiber input power of the corresponding service.

[0020] The second single-wave attenuation value is sent to the source device of the corresponding service, and the process is iterated until the optical power flatness of each service in C-band and L-band is within its respective preset flatness threshold.

[0021] Furthermore, in one embodiment, an iteration number threshold is set for sending the second single-wave attenuation value to the source device of the corresponding service. When the number of times the second single-wave attenuation value is sent to the source device of the corresponding service reaches the iteration number threshold, the adjustment ends.

[0022] Secondly, this application provides an optical power flatness adjustment device for a C+L optical transmission network, the device comprising: The attenuation calculation module is used to group and flatten the single-wavelength optical power at the origin of each service in the C-band and L-band based on the services whose optical power flatness exceeds a preset flatness threshold, so as to obtain the first single-wavelength attenuation value required for each single-wavelength optical power.

[0023] The slope calculation module is used to calculate the gain slope of the amplifier for each type of optical fiber in full-wave conditions in each band.

[0024] The adjustment module is used to send the first single-wave attenuation value, the gain slope, and the expected combined power of the amplifiers in each band to the corresponding service source equipment. If the optical power flatness of each service in the C-band and L-band is within its respective preset flatness threshold, the adjustment ends.

[0025] The beneficial effects of the technical solutions provided in this application include: This application addresses services in the C-band and L-band where the optical power flatness exceeds a preset flatness threshold. It groups and flattens the single-wavelength optical power at the transmitting end of each service in each band to obtain the required first single-wavelength attenuation value for each single-wavelength optical power. By calculating the first single-wavelength attenuation value after grouping and flattening, precise adjustment of the single-wavelength optical power at the transmitting end of the service optical signal within each band can be achieved, thereby improving the efficiency of optical power flatness adjustment. The gain slope of the amplifiers for various types of optical fibers in each band under full-wavelength conditions is calculated separately. The first single-wavelength attenuation value, the gain slope, and the expected combined power of the amplifiers in each band are sent to the corresponding service source equipment. If the optical power flatness of each service in the C-band and L-band is within its respective preset flatness threshold, the adjustment ends. By combining the first single-wavelength attenuation value, the expected combined power, the actual combined power, and the gain slope to adjust the C+L optical transmission network, the optical power flatness of the C+L optical transmission network can be improved quickly and effectively. Attached Figure Description

[0026] Figure 1 This is a flowchart of the optical power flatness adjustment method for a C+L optical transmission network according to an embodiment of this application.

[0027] Figure 2 This is a schematic diagram of the optical power flatness adjustment multiplexing section of the C+L optical transmission network of this application.

[0028] Figure 3 This application includes a flowchart of a two-stage optical power flatness adjustment method.

[0029] Figure 4 This is a block diagram of the optical power flatness adjustment device for a C+L optical transmission network according to an embodiment of this application. Detailed Implementation

[0030] 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.

[0031] 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.

[0032] In a first aspect, embodiments of this application provide a method for adjusting the optical power flatness of a C+L optical transmission network.

[0033] In one embodiment, see Figure 1 As shown, the optical power flatness adjustment method for the above-mentioned C+L optical transmission network includes: S1. For services whose optical power flatness in the C-band and L-band exceeds the preset flatness threshold, the single-wavelength optical power at the origin of the above services in each band is grouped and flattened to obtain the first single-wavelength attenuation value required for each single-wavelength optical power.

[0034] S2. Calculate the gain slope of the amplifier for each type of optical fiber in full-wave condition in each band.

[0035] S3. Send the first single-wave attenuation value, the gain slope, and the expected combined power of the amplifiers in each band to the corresponding service source equipment. If the optical power flatness of each service in the C-band and L-band is within their respective preset flatness thresholds, the adjustment ends.

[0036] In this embodiment, the required first attenuation value for each single wavelength is calculated by grouping and flattening to eliminate power dispersion at the transmitting end. Then, the full-wave gain slope is calculated according to the fiber type to quantify the wavelength-dependent gain error of the amplifier. The above attenuation value, gain slope, and expected combined power are simultaneously sent to the service source equipment to complete the linkage configuration of transmitting-end attenuation and amplifier slope. If the optical power flatness of each service in C-band and L-band is within its corresponding preset flatness threshold, the adjustment ends. By eliminating power deviation at the transmitting end, reducing subsequent cross-segment SRS accumulation, and reducing amplifier wavelength-dependent gain error through gain slope pre-compensation, the optical power flatness of long link segments can be quickly and effectively improved.

[0037] Furthermore, in one embodiment, the method for calculating the optical power flatness in the C-band and L-band in step S1 above is as follows: Obtain the single-wavelength optical power of each service path in C-band and L-band.

[0038] Within each band, the optical power flatness of the corresponding service is calculated based on the single-wavelength optical power of the same type of service. Optical power flatness is the difference between the maximum and minimum single-wavelength optical power of the same type of service. The same type of service refers to one or more services of the same type; the optical power flatness for each service is calculated separately.

[0039] In this embodiment, by directly reading the single-wavelength optical power of the services already configured on the existing network, the flatness is calculated using "maximum optical power - minimum optical power" within the same service type. The calculation process does not require additional instrument scanning or complex spectral fitting, resulting in low computational load and high real-time performance. It can be automatically triggered by the network management system's periodic data collection, immediately detecting channel differences exceeding the threshold, providing an immediate and accurate data foundation for subsequent group flattening, and significantly shortening the response time from anomaly identification to attenuation adjustment at the origin.

[0040] In one embodiment, the service type is divided according to the modulation mode and service rate, including but not limited to QPSK (Quadrature Phase Shift Keying), 16QAM (16 Quadrature Amplitude Modulation) and 64QAM (64 Quadrature Amplitude Modulation).

[0041] Furthermore, in one embodiment, in step S1 above, the single-wavelength optical power of the aforementioned service transmitter in each band is grouped and leveled to obtain the first single-wavelength attenuation value required for each single-wavelength optical power. That is, the single-wavelength optical power of the aforementioned service transmitter in the C-band is grouped and leveled to obtain the first single-wavelength attenuation value required for each single-wavelength optical power in the C-band; the single-wavelength optical power of the aforementioned service transmitter in the L-band is grouped and leveled to obtain the first single-wavelength attenuation value required for each single-wavelength optical power in the L-band. The specific steps are as follows: Within each band, the single-wavelength optical power of the aforementioned service origin is grouped according to the service type.

[0042] In each group, the minimum single-wavelength optical power is used as the benchmark, and the reserved attenuation value is combined with the first single-wavelength attenuation value required for each single-wavelength optical power. The calculation formula (1) is as follows. Among them, the C-band and L-band correspond to their respective reserved attenuation values. The reserved attenuation value is determined according to the margin of the optical transmission network, and the default value is 3~4dB.

[0043] V1 = (P_s - P_m + V) _预留 (1), Where V1 represents the first single-wavelength attenuation value, P_s represents the single-wavelength optical power of each service transmitter whose optical power flatness exceeds the preset flatness threshold in C-band and L-band, P_m represents the minimum single-wavelength optical power in each group, and V _预留 This indicates the reserved attenuation value for the corresponding band.

[0044] In this embodiment, by grouping by service type and calculating the first single-wave attenuation value required for each channel based on the minimum power within the group, and independently setting reserved attenuation values ​​for C and L bands, it is ensured that line margin is still retained after adjustment, while avoiding excessive compression at one time that would lead to OSNR degradation.

[0045] Furthermore, in one embodiment, in step S2 above, the gain slope of the amplifier for each type of optical fiber in full-wave conditions is calculated for each band, that is, the gain slope of the amplifier for each type of optical fiber in the C-band in full-wave conditions is calculated, and the gain slope of the amplifier for each type of optical fiber in the L-band in full-wave conditions is calculated. The specific steps are as follows: Set the expected output power of the amplifiers for each type of optical fiber in the C-band and L-band under full-wave conditions, and determine the gain slope of the amplifiers for each type of optical fiber under full-wave conditions based on the expected output power.

[0046] Here is a specific example: For C-band optical fibers, the amplifier output power at full-wave conditions must reach 23 dBm @ G652D, 24 dBm @ G654E, and 22 dBm @ G655, resulting in a gain slope of -3; for L-band optical fibers, the amplifier output power must reach 21.5 dBm @ G652D, 23 dBm @ G654E, and 20.5 dBm @ G655, resulting in a gain slope of -1.

[0047] Furthermore, in one embodiment, the method for calculating the expected combined power of the amplifiers in each band in step S3 above includes the following steps: Based on the quantity of various services and the preset expected fiber input power, the expected multiplexing power of the amplifiers for C-band and L-band are calculated respectively.

[0048] Here is a specific example: If there are three different types of services in the C-band or L-band, and the number of each type of service is N_a, N_b, and N_c, respectively, and the expected fiber input power of each type of service configured by the network management is P_a, P_b, and P_c, respectively.

[0049] Since linear units are required in subsequent calculations, the units dbm of the expected fiber input power P_a, P_b, and P_c are converted to mw to obtain P_a1, P_b1, and P_c1. The calculation formula (2) for the expected combined power of the amplifier is as follows.

[0050] Expected combined power = 10*log(N_a*P_a1+N_b*P_b1+N_c*P_c1)(2).

[0051] When calculating the expected combined power of an amplifier in C-band or L-band, if the number of single-wave optical signals in the band is less than or equal to a preset number threshold, a power bias value k is introduced for correction. The formula (3) for calculating the expected combined power of the amplifier with the power bias value is as follows.

[0052] Expected combined power = 10*log(N_a*P_a1+N_b*P_b1+N_c*P_c1)+k(3).

[0053] The aforementioned power bias value is determined based on the number of channels. When the number of channels is less than or equal to a first preset threshold N (i.e., N_a + N_b + N_c ≤ N), the first power bias value is increased. When the number of channels is greater than the first preset threshold and less than or equal to a second preset threshold, the second power bias value is increased. The first preset threshold, the second preset threshold, the first power bias value, and the second power bias value are all calibrated based on a test experiment measuring the difference between the amplifier's expected combined power and the amplifier's pure signal combined power, and the first power bias value is greater than the second power bias value. In this embodiment, when the number of channels is less than or equal to the first preset threshold 3, the first power bias value is 2; when the number of channels is greater than the first preset threshold 3 and less than or equal to the second preset threshold 6, the second power bias value is 1.

[0054] In this embodiment, if the number of single-wavelength optical signals in each band is less than or equal to a preset threshold, a power bias is introduced when calculating the expected combined power of the amplifier in that band to compensate for the power deviation caused by the small number of channels, ensuring that the output power of the amplifier can meet the design requirements.

[0055] Furthermore, in one embodiment, in step S3 above, the data is sent to the corresponding service source devices, and the specific steps are as follows: The first single-wave attenuation value, the gain slope, and the expected combined power of the amplifiers in each band are sent to the service source device and the success of the transmission is verified. If successful, the corresponding service source device is configured; otherwise, the retransmission mechanism is initiated for retransmission. An error message is displayed when the number of retransmissions exceeds the preset retransmission threshold.

[0056] The aforementioned service source equipment consists of attenuators and amplifiers. Specifically, the first single-wave attenuation value is sent to the attenuator in the corresponding band, and the gain slope and the expected combined power of the amplifier are sent to the amplifier in the corresponding band. If there are two stages of amplifiers in the service path, the gain slope of the first-stage amplifier is set to 0.

[0057] In this embodiment, the first single-wave attenuation value, gain slope, and desired combined power are packaged into a configuration message and sent to the attenuator and amplifier of the corresponding band to achieve simultaneous effect of the three parameters. The network management system immediately reads back for verification. If successful, the configuration is complete. If it fails, it is automatically retransmitted and an alarm is reported when the threshold is exceeded. The whole process does not require manual login to each site to set parameters one by one. This reduces the risk of parameter mismatch and omission and ensures that the C and L bands simultaneously achieve the preset flatness and power targets within milliseconds. This significantly shortens the service activation time and improves network operation and maintenance efficiency.

[0058] Furthermore, in one embodiment, in step 3 above, the first single-wave attenuation value, the gain slope, and the expected combined power of the amplifiers in each band are respectively sent to the corresponding service source equipment. If there are still services in the C-band and L-band whose optical power flatness exceeds their respective preset flatness thresholds: In each band, the average optical power is calculated based on the single-wavelength optical power at the transmitting and receiving ends of the corresponding service. Then, combined with the preset expected input fiber power of the corresponding service, the second single-wavelength attenuation value is calculated using the following formula: P = (P_s + P_d) / 2 (4), V2 = (P - P_expected fiber insertion) (5) Where P represents the average optical power, P_d represents the single-wavelength optical power at the receiving end of the corresponding service, V2 represents the second single-wavelength attenuation value, and P_expected input fiber represents the preset expected input fiber power of the corresponding service.

[0059] The second single-wave attenuation value is sent to the source device of the corresponding service. In this embodiment, the source device is an attenuator. This process is iterated until the optical power flatness of each service in C-band and L-band is within its respective preset flatness threshold. That is, the optical power flatness of each service in C-band is within the preset flatness threshold corresponding to C-band, and the optical power flatness of each service in L-band is within the preset flatness threshold corresponding to L-band.

[0060] In this embodiment, if there are still services whose optical power flatness exceeds their respective preset flatness thresholds after the first round of "attenuation + slope + multiplexing" configuration, the average of the measured single-wavelength optical power at the transmitting and receiving ends is taken, and then combined with the preset expected fiber input power of the corresponding service, the second single-wavelength attenuation value is calculated, and the corresponding attenuator is set, until all services in the C and L bands simultaneously meet the flatness thresholds.

[0061] Furthermore, in one embodiment, an iteration number threshold is set for the above-mentioned sending of the second single-wave attenuation value to the source device of the corresponding service. When the number of times the second single-wave attenuation value is sent to the source device of the corresponding service reaches the iteration number threshold, the adjustment ends regardless of whether the optical power flatness of each service in the C-band and L-band is within its respective preset flatness threshold.

[0062] See Figure 2 As shown, Figure 2 This is a schematic diagram of the optical power flatness adjustment multiplexing section in a C+L optical transmission network. First, C-band and L-band signals are multiplexed to form a multiplexed optical signal. After entering the optical fiber, due to the SRS effect, energy from the C-band shifts to the L-band, causing power imbalance. The signal is then amplified by the first-stage amplifier. If the gain is tilted with wavelength, the difference will be further amplified. At this point, the optical power flatness is monitored at the output end and found to be out of standard. Single-wavelength optical power attenuation correction is then performed on each out-of-standard channel to bring the single-wavelength optical power back to the same level. The corrected signal is then amplified by the second-stage amplifier, finally outputting a multiplexed optical signal with the flatness met, completing the closed-loop adjustment.

[0063] See Figure 3 As shown, a complete embodiment including two-stage optical power flatness adjustment is given, and the specific steps are as follows: A1. Obtain the single-wavelength optical power of each service path in C-band and L-band, calculate the single-wavelength optical power of the same type of service in each band, and calculate the optical power flatness of the corresponding service.

[0064] A2. Determine whether the above optical power flatness is within the preset flatness threshold. If yes, proceed to step A10; otherwise, proceed to step A3.

[0065] A3. The single-wavelength optical power of the above-mentioned services in each band is grouped and leveled to obtain the first single-wavelength attenuation value required for each single-wavelength optical power.

[0066] A4. Calculate the gain slope of the amplifier for each type of optical fiber in full-wave condition and the expected combined power of the amplifier in each band.

[0067] A5. Send the first single-wave attenuation value, the gain slope, and the expected combined power of the amplifiers for each band to the corresponding service source equipment.

[0068] A6. Determine whether the optical power flatness of each service in each band is within its corresponding preset flatness threshold. If yes, proceed to step A10; otherwise, proceed to step A7.

[0069] A7. In each band, calculate the average optical power based on the single-wavelength optical power at the transmitting and receiving ends of the corresponding service, and calculate the second single-wavelength attenuation value in combination with the preset expected fiber input power of the corresponding service. Send the second single-wavelength attenuation value to the source end equipment of the corresponding service.

[0070] A8. Determine whether the optical power flatness of each service in each band is within its corresponding preset flatness threshold. If yes, proceed to step A10; otherwise, proceed to step A9.

[0071] A9. Determine whether the number of iterations for sending the second single-wave attenuation value to the source device of the corresponding service exceeds the preset number of iterations. If yes, proceed to step A10; otherwise, proceed to step A7.

[0072] A10, End adjustment.

[0073] In this embodiment, a "two-stage adjustment + iterative limit" mechanism is used. The first round uses grouping to flatten the waveform, linking the gain slope with the desired combined power to eliminate most flatness deviations. The second round calculates a second single-wavelength attenuation value based on the average power at the transmitting and receiving ends, finely adjusting the single-wavelength optical power still within or outside the preset flatness threshold until the single-wavelength optical power of all services falls within the preset flatness threshold. Both adjustments are automatically completed on the network management side, enabling both C-band and L-band to simultaneously reach the target flatness in a short time. This significantly reduces the risk of power imbalance and signal-to-noise ratio degradation caused by the SRS effect, providing a stable, flat, and high-margin power spectrum environment for subsequent high-speed, high-capacity transmission.

[0074] Secondly, this application provides an embodiment of an optical power flatness adjustment device for a C+L optical transmission network. See also... Figure 4 As shown, the above-mentioned device includes an attenuation calculation module, a slope calculation module, and an adjustment module, specifically: The attenuation calculation module is used to group and flatten the single-wavelength optical power at the origin of each service in the C-band and L-band based on the services whose optical power flatness exceeds a preset flatness threshold, so as to obtain the first single-wavelength attenuation value required for each single-wavelength optical power.

[0075] The slope calculation module is used to calculate the gain slope of the amplifier for each type of optical fiber in full-wave conditions in each band.

[0076] The adjustment module is used to send the first single-wave attenuation value, the gain slope, and the expected combined power of the amplifiers in each band to the corresponding service source equipment. If the optical power flatness of each service in the C-band and L-band is within its respective preset flatness threshold, the adjustment ends.

[0077] In this application, a three-parameter closed-loop adjustment of "attenuation-slope-power" is formed by integrating a packet flattening, gain slope compensation, and desired multiplexing power linkage algorithm on the network management side: Packet flattening aligns the single-wavelength optical power of the same service type and retains attenuation margin with a reserved attenuation value; full-wavelength gain slope offsets fiber wavelength-dependent loss and SRS energy transfer, and the desired multiplexing power unifies the total band level; if flatness deviation still exists, iterative fine-tuning of the average power at the transceiver end is initiated until all services in the C and L bands simultaneously meet the flatness threshold. The number of iterations throughout the process is protected by a threshold, which can effectively improve the optical power flatness of the C+L optical transmission network in a short time and significantly reduce the risk of signal-to-noise ratio degradation caused by power imbalance.

[0078] It should be noted that the sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0079] 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.

[0080] 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.

[0081] 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.

[0082] 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.

[0083] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, and includes several instructions to cause a terminal device to execute the methods described in the various embodiments of this application.

[0084] 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 adjusting the optical power flatness of a C+L optical transmission network, characterized in that, The method includes: For services where the optical power flatness of the C-band and L-band exceeds a preset flatness threshold, the single-wavelength optical power at the transmission end of the service in each band is grouped and flattened to obtain the first single-wavelength attenuation value required for each single-wavelength optical power. Calculate the gain slope of the amplifier for each type of optical fiber in full-wave condition in each band; The first single-wave attenuation value, the gain slope, and the expected combined power of the amplifiers in each band are sent to the corresponding service source equipment. If the optical power flatness of each service in C-band and L-band is within their respective preset flatness thresholds, the adjustment ends. The step of grouping and leveling the single-wavelength optical power at the service transmitter of each band to obtain the first single-wavelength attenuation value required for each single-wavelength optical power includes: Within each band, the single-wavelength optical power of the service originating from the service is grouped according to the service type; In each group, the minimum single-wavelength optical power is used as the benchmark, and the first single-wavelength attenuation value required for each single-wavelength optical power is calculated in combination with the reserved attenuation value. The service types are classified according to modulation mode and service rate.

2. The optical power flatness adjustment method for C+L optical transmission networks as described in claim 1, characterized in that, The methods for calculating optical power flatness in the C-band and L-band include: Obtain the single-wavelength optical power of each service path in C-band and L-band; Within each band, the optical power flatness of the corresponding service is calculated based on the single-wavelength optical power of the same type of service.

3. The optical power flatness adjustment method for C+L optical transmission networks as described in claim 1, characterized in that, The calculation methods for the expected combined power of the amplifiers in each band include: Based on the quantity of various services and the preset expected fiber input power, calculate the expected combined power of C-band and L-band respectively; When calculating the expected combined power of C-band or L-band, if the number of channels in the band is less than or equal to a preset threshold, a power bias is introduced for correction.

4. The optical power flatness adjustment method for C+L optical transmission networks as described in claim 3, characterized in that, The power bias value is determined based on the number of channels. When the number of channels is less than or equal to a first preset threshold, the first power bias value is increased. When the number of channels is greater than the first preset threshold and less than or equal to a second preset threshold, the second power bias value is increased. The first preset threshold, the second preset threshold, the first power bias value, and the second power bias value are all calibrated based on the difference test experiment between the amplifier's expected combined power and the amplifier's pure signal combined power, and the first power bias value is greater than the second power bias value.

5. The method for adjusting the optical power flatness of a C+L optical transmission network as described in claim 1, characterized in that, The process of distributing the data to the corresponding service source devices includes: The first single-wave attenuation value, the gain slope, and the expected combined power of the amplifiers in each band are sent to the service source device and the success of the transmission is verified. If the transmission is successful, the corresponding service source device is configured. If not, the retransmission mechanism is started to retransmit the data. An error message is displayed when the number of retransmissions exceeds the preset retransmission threshold.

6. The optical power flatness adjustment method for a C+L optical transmission network as described in claim 1, characterized in that, The process of distributing the data to the corresponding service source devices includes: If there are two amplifier stages in the business path, set the gain slope of the first amplifier to 0.

7. The optical power flatness adjustment method for a C+L optical transmission network as described in claim 1, characterized in that, The first single-wave attenuation value, the gain slope, and the expected combined power of the amplifiers in each band are respectively sent to the corresponding service source equipment. If there are still services in the C-band and L-band whose optical power flatness exceeds their respective preset flatness thresholds: In each band, the average optical power is calculated based on the single-wavelength optical power at the transmitting and receiving ends of the corresponding service, and the second single-wavelength attenuation value is calculated in combination with the preset expected fiber input power of the corresponding service. The second single-wave attenuation value is sent to the source device of the corresponding service, and the process is iterated until the optical power flatness of each service in C-band and L-band is within its respective preset flatness threshold.

8. The method for adjusting the optical power flatness of a C+L optical transmission network as described in claim 7, characterized in that, An iteration threshold is set for sending the second single-wave attenuation value to the source device of the corresponding service. When the number of times the second single-wave attenuation value is sent to the source device of the corresponding service reaches the iteration threshold, the adjustment ends.

9. An optical power flatness adjustment device for a C+L optical transmission network employing the optical power flatness adjustment method for a C+L optical transmission network as described in any one of claims 1-8, characterized in that, The device includes: The attenuation calculation module is used to group and flatten the single-wave optical power at the transmission end of the C-band and L-band services whose optical power flatness exceeds a preset flatness threshold, so as to obtain the first single-wave attenuation value required for each single-wave optical power. The slope calculation module is used to calculate the gain slope of the amplifier for each type of optical fiber in full-wave conditions in each band. The adjustment module is used to send the first single-wave attenuation value, the gain slope, and the expected combined power of the amplifiers in each band to the corresponding service source equipment. If the optical power flatness of each service in the C-band and L-band is within its respective preset flatness threshold, the adjustment ends.

Images