Optical link power balance adjusting method and optical link power balance adjusting device

Abstract

The invention discloses an optical link power balance adjustment method and an optical link power balance adjustment device. The optical link power balance adjustment method comprises the following steps: acquiring an optical transmission operating wavelength distribution demand; selecting a wave channel distribution mode WDMk which covers the optical transmission working wavelength distribution requirement and has the minimum number of wavelength channels from the M wave channel distribution modes; wherein the numbers of wavelength channels in different wave channel distribution modes are different, k = 0, 1, 2... M-1; an optical transmission operating wavelength is operated in a wave channel distribution mode WDMk. According to the multi-band wavelength division multiplexing optical transmission system, the wave channel distribution mode which covers the optical transmission working wavelength distribution requirement and has the smallest number of wavelength channels is selected from the M wave channel distribution modes, and the optical transmission working wavelength is operated in the wave channel distribution mode, so that unnecessary filling waves can be reduced during construction and operation maintenance of the multi-band wavelength division multiplexing optical transmission system, and the optical transmission efficiency is improved. Therefore, the nonlinear influence of the optical fiber is reduced, the performance of an optical transmission system is improved, and the technical problems that the nonlinearity of the optical fiber is increased and the optical signal performance is poor are solved.

Description

Technical Field

[0001] The present application relates to the technical fields of optical communication, optical switching, and optical interconnection, and particularly relates to an optical link power equalization adjustment method and an optical link power equalization adjustment device. Background Art

[0002] With the continuous deepening of the social informatization process, emerging network applications represented by 5G mobile Internet, 4K / 8K high-definition video, VR / AR, data center cloud services, and industrial Internet continue to maintain rapid growth in the bandwidth demand for optical communication networks, which poses challenges to current optical fiber communication transmission technologies. In the past decade, the annual growth rate of the capacity of optical fiber communication has dropped from 78% in the 20th century to 20% currently, far behind the annual growth rate demand of about 45% for global network traffic.

[0003] To alleviate the upcoming "capacity crisis" in network information transmission, the industry weighs the utilization ability of optical signal multiplexing dimensions and the refined utilization level of each multiplexing dimension, and tends to further expand the available spectral resources of wavelength division multiplexing on a mature single-mode optical fiber transmission system, expanding the optical transmission band from the current C band to the C+L band, and the S+C+L band, and even the entire band range of low loss of the optical fiber. For a multi-band wavelength division multiplexing optical transmission system after spectral expansion, it is necessary to focus on issues such as the transmission performance differences caused by the wavelength correlation of the optical transmission link gain, the energy transfer between frequency bands in a broadband optical transmission system due to the stimulated Raman effect, and the aggravation of nonlinear noise caused by the increase in optical power.

[0004] In related technologies, for optical transmission with spectral expansion (such as the C+L band or the S+C+L band), the stimulated Raman effect causes the power of the C-band signal to transfer to the L band, increasing the difficulty of power equalization. Generally, full wavelength filling is used to control, at the cost of increasing fiber nonlinearity, which is not optimal for the performance of QAM (Quadrature Amplitude Modulation) optical signals.

[0005] Therefore, it is necessary to design a new optical link power equalization adjustment method to overcome the above problems. Summary of the Invention

[0006] The present application provides an optical link power equalization adjustment method and an optical link power equalization adjustment device, which can solve the technical problems of increased fiber nonlinearity and poor optical signal performance existing in related technologies.

[0007] In a first aspect, an embodiment of the present application provides an optical link power equalization adjustment method, and the optical link power equalization adjustment method includes:

[0008] Obtain the wavelength distribution requirements for optical transmission operation;

[0009] Select a channel distribution mode WDM_k from M channel distribution modes that covers the optical transmission operating wavelength distribution requirements and has the fewest number of wavelength channels; where the number of wavelength channels in different channel distribution modes is different, and k = 0, 1, 2... M-1;

[0010] Operate the optical transmission operating wavelength in the channel distribution mode WDM_k.

[0011] Combined with the first aspect, in one embodiment, the number of wavelength channels in the M channel distribution modes decreases in sequence, and the channel distribution mode WDM_i covers the channel distribution mode WDM_(i+1), where i = 0, 1, 2... M-2.

[0012] Combined with the first aspect, in one embodiment, when the optical transmission operating wavelength distribution changes, adjust the optical transmission operating wavelength to operate in the channel distribution mode that covers the changed optical transmission operating wavelength and has the fewest number of channels.

[0013] Combined with the first aspect, in one embodiment, the step of adjusting the optical transmission operating wavelength to operate in the channel distribution mode that covers the changed optical transmission operating wavelength and has the fewest number of channels when the optical transmission operating wavelength distribution changes includes:

[0014] When the optical transmission operating wavelength W2D_s operates in the channel distribution mode WDM_n and the optical transmission operating wavelength increases from W2D_s to W2D_t, where n = 0, 1, 2... M-2;

[0015] If And Then in the channel distribution mode WDM_n, replace the filling wave of the wavelength channel corresponding to the increased operating wavelength with the operating wavelength.

[0016] If And Where p = 0, 1, 2... M-2; and p < n;

[0017] Then adjust the optical transmission operating wavelength W2D_s from the channel distribution mode WDM_n to the channel distribution mode WDM_p, and in the channel distribution mode WDM_p, replace the filling wave of the wavelength channel corresponding to the increased operating wavelength with the operating wavelength.

[0018] Combined with the first aspect, in one embodiment, the step of adjusting the optical transmission operating wavelength W2D_s from the channel distribution mode WDM_n to the channel distribution mode WDM_p, and in the channel distribution mode WDM_p, replacing the filling wave of the wavelength channel corresponding to the increased operating wavelength with the operating wavelength includes:

[0019] Gradually increase the filling wave and configure the corresponding optical transmission link parameters and wavelength channel parameters, and gradually adjust the optical transmission working wavelength W2D_s from the wavelength division multiplexing mode WDM_n to the wavelength division multiplexing mode WDM_p;

[0020] Then, in the wavelength division multiplexing mode WDM_p, replace the filling wave of the wavelength channel corresponding to the increased working wavelength with the working wavelength.

[0021] Combined with the first aspect, in an embodiment, when the optical transmission working wavelength distribution changes, adjusting the optical transmission working wavelength to operate in the wavelength division multiplexing mode that covers the changed optical transmission working wavelength and has the fewest number of wavelength channels includes:

[0022] When the optical transmission working wavelength W2D_s operates in the wavelength division multiplexing mode WDM_n, and the optical transmission working wavelength decreases from W2D_s to W2D_t, where n = 0, 1, 2... M - 1;

[0023] If And Then, in the wavelength division multiplexing mode WDM_n, replace the working wavelength of the wavelength channel corresponding to the decreased working wavelength with the filling wave;

[0024] If And Where p = 0, 1, 2... M - 2; and p < n;

[0025] Then, in the wavelength division multiplexing mode WDM_n, replace the working wavelength of the wavelength channel corresponding to the decreased working wavelength with the filling wave, then gradually adjust the optical transmission link parameters and wavelength channel parameters, and remove unnecessary filling waves, and gradually adjust the wavelength division multiplexing mode from WDM_n to WDM_p.

[0026] Combined with the first aspect, in an embodiment, when the optical transmission working wavelength distribution changes, adjusting the optical transmission working wavelength to operate in the wavelength division multiplexing mode that covers the changed optical transmission working wavelength and has the fewest number of wavelength channels includes:

[0027] When the optical transmission working wavelength W2D_s operates in the wavelength division multiplexing mode WDM_n, and the optical transmission working wavelength drops from W2D_s to W2D_t, where n = 0, 1, 2... M - 1;

[0028] Then, in the wavelength division multiplexing mode WDM_n, replace the working wavelength of the wavelength channel corresponding to the dropped wavelength with the filling wave; when the dropped wavelength is restored, replace the filling wave of the wavelength channel corresponding to the dropped wavelength with the working wavelength.

[0029] Combined with the first aspect, in an embodiment, the optical link power equalization adjustment method further includes:

[0030] Transmit a test wave and replace the wavelength channel where the filling wave is located in the channel distribution pattern by time-division multiplexing;

[0031] Detect the transmission performance of each wavelength in the channel distribution pattern under the optical transmission link parameter configuration;

[0032] Based on the detected transmission performance under the optical transmission link parameter configuration, adjust the distribution and parameter configuration of the filling wave.

[0033] In a second aspect, an embodiment of the present application provides an optical link power equalization adjustment device, and the optical link power equalization adjustment device includes:

[0034] An adjustment controller, which is used to obtain the optical transmission working wavelength distribution requirement, and select, from M channel distribution patterns, a channel distribution pattern WDM_k that covers the optical transmission working wavelength distribution requirement and has the smallest number of wavelength channels, and run the optical transmission working wavelength in the channel distribution pattern WDM_k; where the number of wavelength channels of different channel distribution patterns is different, and k = 0, 1, 2... M-1.

[0035] Combined with the second aspect, in an implementation manner, the optical link power equalization adjustment device further includes:

[0036] A working wavelength transmitter and a working wavelength receiver, the working wavelength transmitter is connected to one end of the optical transmission link through a multiplexer, and the other end of the optical transmission link is connected to the working wavelength receiver through a demultiplexer;

[0037] A test wave transmitter, which is connected to the multiplexer;

[0038] A wide-spectrum noise source, which is connected to the multiplexer through a filtering and shaping device;

[0039] A link monitor, the link detector is connected to the demultiplexer, and the link monitor is signal-connected to the adjustment controller, and the adjustment controller is signal-connected to the filtering and shaping device; the link monitor is used to detect the transmission performance of each wavelength in the channel distribution pattern under the optical transmission link parameter configuration; the adjustment controller is used to adjust the distribution and parameter configuration of the filling wave generated by the filtering and shaping device based on the detected transmission performance under the optical transmission link parameter configuration.

[0040] The beneficial effects brought by the technical solution provided by the embodiment of the present application include:

[0041] By selecting, from among M channel distribution patterns, the channel distribution pattern that covers the optical transmission working wavelength distribution requirements and has the fewest number of wavelength channels, and operating the optical transmission working wavelength in this channel distribution pattern, during the construction, operation, and maintenance of a multi-band wavelength division multiplexing optical transmission system, unnecessary filler waves can be reduced, thereby reducing the impact of fiber nonlinearity, improving the performance of the optical transmission system, and solving the technical problems of increased fiber nonlinearity and poor optical signal performance in the related art. Description of the Drawings

[0042] Figure 1 Schematic flowchart of an embodiment of the optical link power balance adjustment method of the present application;

[0043] Figure 2 Schematic diagram of the channel distribution pattern when the wavelength channels of the optical transmission link of the present application are evenly distributed;

[0044] Figure 3 Schematic diagram when the optical transmission working wavelength of the embodiment of the present application increases;

[0045] Figure 4 Schematic diagram when the optical transmission working wavelength of the embodiment of the present application decreases;

[0046] Figure 5 Schematic diagram when the optical transmission working wavelength of the embodiment of the present application experiences wavelength loss;

[0047] Figure 6 Schematic diagram of the architecture of the optical link power balance adjustment device provided by the embodiment of the present application. Detailed Embodiments

[0048] In order to enable those skilled in the art of the present technology to better understand the solution of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present application.

[0049] First, some technical terms in the present application are explained to facilitate understanding of the present application by those skilled in the art.

[0050] WDM: Wavelength Distribution Model, that is, Channel Distribution Pattern.

[0051] W2D: Working Wavelength Distribution, that is, Working Wavelength Distribution.

[0052] To make the objectives, technical solutions, and advantages of this application clearer, the following will further describe the embodiments of this application in detail with reference to the accompanying drawings.

[0053] In a first aspect, an embodiment of this application provides a method for adjusting the optical link power balance.

[0054] In one embodiment, referring to Figure 1 , Figure 1 is a schematic flowchart of the first embodiment of the optical link power balance adjustment method of this application. As Figure 1 shown, the optical link power balance adjustment method includes:

[0055] S1: Obtain the optical transmission working wavelength distribution requirements.

[0056] S2: Select, from M channel distribution modes, a channel distribution mode WDM_k that covers the optical transmission working wavelength distribution requirements and has the fewest wavelength channels; where the number of wavelength channels in different channel distribution modes is different, and k = 0, 1, 2... M - 1.

[0057] S3: Run the optical transmission working wavelength in the channel distribution mode WDM_k.

[0058] In this embodiment, first, in combination with the channel construction plan of the optical transmission link, M typical channel distribution modes WDM_m (m = 0, 1, 2... M - 1) of the optical transmission link are determined. The channel distribution mode WDM_m is the (m + 1)-th typical working wavelength distribution situation within the available optical spectrum range of the optical transmission link, and the number of wavelength channels in different channel distribution modes is different. Under the typical channel distribution mode, by adjusting the link parameter configuration and wavelength channel parameter configuration, it can be ensured that each working wavelength works properly and has a certain performance redundancy. During the initialization of the optical link, the initial demand W2D_0 for the working wavelength distribution of the optical transmission link construction can be obtained first. According to this initial demand W2D_0, the channel distribution mode WDM_k (k = 0, 1, 2... M - 1) is selected, so that the channel distribution mode WDM_k can not only cover the initial demand W2D_0 for the working wavelength distribution of the optical transmission link construction, but also has the fewest wavelength channels, and let the initial demand W2D_0 for the working wavelength distribution of the optical transmission link construction run in this channel distribution mode WDM_k. During the subsequent operation of the optical transmission link, the optical transmission working wavelength distribution requirements can also be obtained in real time, and a channel distribution mode with an appropriate number of channels can be selected according to the optical transmission working wavelength distribution requirements for operation.

[0059] In this embodiment, a channel distribution pattern that covers the optical transmission working wavelength distribution requirements and has the fewest number of wavelength channels is selected from M channel distribution patterns, and the optical transmission working wavelength is operated in this channel distribution pattern. Selecting this channel distribution pattern can not only ensure the normal operation of the optical transmission working wavelength, but also make the number of wavelength channels filled with filling waves in this channel distribution pattern the fewest after the optical transmission working wavelength operates in this channel distribution pattern. When building, operating, and maintaining a multi-band wavelength division multiplexing optical transmission system, unnecessary filling waves can be reduced, and there is a certain performance redundancy, thereby reducing the impact of fiber nonlinearity and improving the performance of the optical transmission system, solving the technical problems of increased fiber nonlinearity and poor optical signal performance in the related art.

[0060] Preferably, the number of wavelength channels of the M channel distribution patterns of the optical transmission link decreases in sequence, and the channel distribution pattern WDM_i covers the channel distribution pattern WDM_(i + 1), that is where i = 0, 1, 2... M - 2.

[0061] See Figure 2 As shown, in this embodiment, M typical WDM modes with uniform distribution of wavelength channels are preferentially considered. The working wavelength range of the optical transmission link is equally divided into N wavelengths according to the minimum channel spacing. From the short wavelength to the long wavelength, they are λ1, λ2, λ3,..., λn - 1, λn, λn + 1,..., λN in sequence.

[0062] The wavelength channel distribution rule of WDM_m (m = 0, 1, 2... M - 1) is: the wavelength with the wavelength number n satisfying n % (2^m) = 1 is in the operating mode. Where n is the nth wavelength from the short wavelength to the long wavelength, and % represents the operation of taking the remainder. That is:

[0063] WDM_0: The wavelength with the wavelength number n satisfying n % (2^0) = 1, that is, all wavelengths, are in the operating mode.

[0064] WDM_1: The wavelength with the wavelength number n satisfying n % (2^1) = 1, that is, the odd - numbered wavelengths, are in the operating mode.

[0065] WDM_2: The wavelength with the wavelength number n satisfying n % (2^2) = 1, such as wavelengths 1, 5, 9,..., are in the operating mode.

[0066] ...

[0067] WDM_m: The wavelength with the wavelength number n satisfying n % (2^m) = 1 is in the operating mode.

[0068] In this embodiment, the M typical channel distribution patterns are arranged in sequence from the most to the fewest number of wavelength channels. With such a setting, the M typical channel distribution patterns satisfy Subsequently, when wave addition or subtraction occurs, it can be directly adjusted step by step to the adjacent channel distribution pattern.

[0069] For the initial requirement W2D_0, select the channel distribution pattern WDM_k (k = 0, 1, 2... M - 1) such that and And adjust the optical transmission link parameter configuration according to the configuration parameter LC_k of the optical transmission link, and configure the corresponding wavelength channel parameters according to the configuration parameter WC_k of each channel transceiver. Among them, the wavelength channels of WDM_k - WD_0 are filled with "padding waves".

[0070] See Figure 3 As shown, an implementation example of M channel distribution patterns is shown.

[0071] The operating wavelength range of the optical transmission link is equally divided into 32 wavelengths according to the minimum channel spacing. From the short wavelength to the long wavelength, they are λ1, λ2, λ3,..., λ31, λ32 in sequence.

[0072] The wavelength channel distribution rule of WDM_m (m = 0, 1, 2, 3) is: the wavelength with the wavelength number n satisfying n % (2^m) = 1 is in the operating mode. Where n is the nth wavelength from the short wavelength to the long wavelength, and % represents the remainder operation. That is:

[0073] WDM_0: The wavelengths with the wavelength number n satisfying n % (2^0) = 1, that is, all wavelengths, are in the operating mode.

[0074] WDM_1: The wavelengths with the wavelength number n satisfying n % (2^1) = 1, that is, the odd wavelengths, are in the operating mode.

[0075] WDM_2: The wavelengths with the wavelength number n satisfying n % (2^2) = 1 are in the operating mode, that is, WDM_2 = {1, 5, 9, 13, 17, 21, 25, 29}.

[0076] WDM_3: The wavelengths with the wavelength number n satisfying n % (2^3) = 1 are in the operating mode, that is, WDM_3 = {1, 9, 17, 25}.

[0077] Further, the optical link power equalization adjustment method further includes step S4: when the optical transmission operating wavelength distribution changes, adjust the optical transmission operating wavelength to a channel distribution mode that operates on the changed optical transmission operating wavelength and has the fewest number of channels. In this embodiment, the change in the optical transmission operating wavelength distribution here can be, for example, based on the previous optical transmission operating wavelength distribution, when the operating wavelength distribution needs to be increased or decreased or a wavelength is lost, or when the previous optical transmission operating wavelength distribution changes to a new optical transmission operating wavelength distribution, a suitable channel distribution mode will be searched again for the changed optical transmission operating wavelength, so that the changed optical transmission operating wavelength can work properly and the number of filled waves is the least.

[0078] Further, in some embodiments, the step of, when the optical transmission operating wavelength distribution changes, adjusting the optical transmission operating wavelength to a channel distribution mode that operates on the changed optical transmission operating wavelength and has the fewest number of channels may include:

[0079] When the optical transmission operating wavelength W2D_s operates in the channel distribution mode WDM_n, and the optical transmission operating wavelength increases from W2D_s to W2D_t, where n = 0, 1, 2... M - 2; if and then in the channel distribution mode WDM_n, replace the filled wave in the wavelength channel corresponding to the increased operating wavelength with the operating wavelength; if and where p = 0, 1, 2... M - 2; and p < n; then adjust the optical transmission operating wavelength W2D_s from the channel distribution mode WDM_n to the channel distribution mode WDM_p, and in the channel distribution mode WDM_p, replace the filled wave in the wavelength channel corresponding to the increased operating wavelength with the operating wavelength.

[0080] In this embodiment, as shown in Figure 3 (a), a specific embodiment is given. The operating wavelength distribution W2D_s = {1, 5, 9, 13, 17, 21} on the optical transmission link operates in the channel distribution mode WDM_2 = {1, 5, 9, 13, 17, 25}, that is and

[0081] When the operating wavelength distribution needs to increase from W2D_s to W2D_t:

[0082] If W2D_t = {1, 5, 9, 13, 17, 21, 25}, at this time and then directly in the channel distribution mode WDM_2, replace the "filled wave" corresponding to W2D_t - W2D_s = {21} with the operating wavelength, such asFigure 3 as shown in (b).

[0083] If W2D_t = {1, 3, 5, 9, 13, 17, 21, 25, 29}, at this time and then adjust the optical transmission working wavelength W2D_s from the wavelength channel distribution mode WDM_2 to the wavelength channel distribution mode WDM_1, and under the wavelength channel distribution mode WDM_1, replace the filling wave of the wavelength channel corresponding to the increased working wavelength with the working wavelength, as Figure 3 shown in (c).

[0084] In this embodiment, if the working wavelength distribution increases, first determine whether the increased working wavelength distribution can still work in the original wavelength channel distribution mode. If it can, there is no need to change the wavelength channel distribution mode of the working wavelength operation, and directly increase the working wavelength in the original wavelength channel distribution mode. If the original wavelength channel distribution mode cannot meet the changed working wavelength distribution, it is necessary to adjust the wavelength channel distribution mode of the working wavelength operation and select the next wavelength channel distribution mode that can meet the working wavelength requirements and has fewer wavelength channels.

[0085] Based on the above technical solution, in an embodiment, the adjustment of the optical transmission working wavelength W2D_s from the wavelength channel distribution mode WDM_n to the wavelength channel distribution mode WDM_p, and under the wavelength channel distribution mode WDM_p, replacing the filling wave of the wavelength channel corresponding to the increased working wavelength with the working wavelength may include: gradually increasing the filling wave and configuring the corresponding optical transmission link parameters and wavelength channel parameters, and gradually adjusting the optical transmission working wavelength W2D_s from the wavelength channel distribution mode WDM_n to the wavelength channel distribution mode WDM_p; then, under the wavelength channel distribution mode WDM_p, replace the filling wave of the wavelength channel corresponding to the increased working wavelength with the working wavelength.

[0086] Refer to Figure 3 as shown. In this embodiment, if W2D_t = {1, 3, 5, 9, 13, 17, 21, 25, 29}, at this time and first keep the working wavelength distribution W2D_s on the optical transmission link unchanged, gradually increase the filling wave and configure the corresponding optical transmission link parameters and wavelength channel parameters, gradually adjust the wavelength channel distribution mode from WDM_2 to WDM_1, and then under the wavelength channel distribution mode WDM_1, replace the "filling wave" corresponding to W2D_t - W2D_s = {3, 21, 29} with the working wavelength, as Figure 3 shown in (c).

[0087] Further, in some alternative embodiments, when the optical transmission operating wavelength distribution changes, adjusting the optical transmission operating wavelength to the channel distribution mode that operates at the changed optical transmission operating wavelength and has the fewest number of channels may include:

[0088] When the optical transmission operating wavelength W2D_s operates in the channel distribution mode WDM_n, and the optical transmission operating wavelength decreases from W2D_s to W2D_t, where n = 0, 1, 2... M - 1; if and then in the channel distribution mode WDM_n, replace the operating wavelength of the wavelength channel corresponding to the decreased operating wavelength with a padding wave; if and where p = 0, 1, 2... M - 2; and p < n; then in the channel distribution mode WDM_n, replace the operating wavelength of the wavelength channel corresponding to the decreased operating wavelength with a padding wave, then gradually adjust the optical transmission link parameters and wavelength channel parameters, and remove unnecessary padding waves, and gradually adjust the channel distribution mode from WDM_n to WDM_p.

[0089] See Figure 4 As shown, an implementation example of reducing the optical link channels when the described optical transmission link is evenly distributed is shown.

[0090] As Figure 4 shown, the optical transmission link operating wavelength range is equally divided into 32 wavelengths according to the minimum channel interval, from short wavelength to long wavelength, which are λ1, λ2, λ3,..., λ31, λ32 in sequence.

[0091] The channel distribution rule of WDM_m (m = 0, 1, 2, 3) is: the wavelength with the wavelength number n satisfying n % (2^m) = 1 is in the operating mode. Where n is the nth wavelength from short wavelength to long wavelength, and % represents the operation of taking the remainder. That is:

[0092] WDM_0: The wavelength with the wavelength number n satisfying n % (2^0) = 1, that is, all wavelengths, are in the operating mode.

[0093] WDM_1: The wavelength with the wavelength number n satisfying n % (2^1) = 1, that is, the odd wavelengths, are in the operating mode.

[0094] WDM_2: The wavelengths with the wavelength number n satisfying n % (2^2) = 1 are in the operating mode, that is, WDM_2 = {1, 5, 9, 13, 17, 21, 25, 29}.

[0095] WDM_3: The wavelengths with the wavelength number n satisfying n % (2^3) = 1 are in the operating mode, that is, WDM_3 = {1, 9, 17, 25}.

[0096] AsFigure 4 As shown in (a), when the working wavelength distribution W2D_s = {1, 3, 5, 9, 13, 17, 21, 25, 29, 31} on the optical transmission link operates in the wavelength channel distribution mode WDM_1 = {1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, 27, 29, 31}, that is and

[0097]

[0098] When the working wavelength distribution needs to be reduced from W2D_s to W2D_t:

[0099] If W2D_t = {1, 3, 5, 9, 13, 17, 21, 25, 29}, at this time and Then directly in the wavelength channel distribution mode WDM_1, replace the working wavelength corresponding to W2D_s - W2D_t = {31} with the "padding wave", as Figure 4 shown in (b).

[0100] If W2D_t = {1, 9, 13, 17, 21, 25}, at this time and Then in the wavelength channel distribution mode WDM_1, replace the working wavelength corresponding to W2D_s - W2D_t = {3, 5, 29, 31} with the "padding wave", then adjust the optical transmission link parameters and wavelength channel parameters, and remove the unnecessary "padding wave", and gradually adjust the wavelength channel distribution mode from WDM_1 to WDM_2, as Figure 4 shown in (c).

[0101] Furthermore, in one embodiment, when the optical transmission working wavelength distribution changes, adjusting the optical transmission working wavelength to operate in the wavelength channel distribution mode that covers the changed optical transmission working wavelength and has the fewest wavelength channels may include:

[0102] When the optical transmission working wavelength W2D_s operates in the wavelength channel distribution mode WDM_n, and the optical transmission working wavelength drops from W2D_s to W2D_t, where n = 0, 1, 2... M - 1; then in the wavelength channel distribution mode WDM_n, replace the working wavelength of the wavelength channel corresponding to the dropped wavelength with the padding wave; when the dropped wavelength is restored, replace the padding wave of the wavelength channel corresponding to the dropped wavelength with the working wavelength.

[0103] Refer to Figure 5 shown, which shows an implementation example of the restoration of the dropped wavelength of the optical link when the described optical transmission link is evenly distributed.

[0104] Similarly, the operating wavelength range of the optical transmission link is equally divided into 32 wavelengths according to the minimum channel spacing. From the short wavelength to the long wavelength, they are λ1, λ2, λ3, ……, λ31, λ32 in sequence.

[0105] The channel distribution rule of WDM_m (m = 0, 1, 2, 3) is as follows: The wavelength with the wavelength number n satisfying n % (2^m) = 1 is in the operating mode. Here, n is the nth wavelength from the short wavelength to the long wavelength, and % represents the operation of taking the remainder. That is:

[0106] WDM_0: The wavelengths with the wavelength number n satisfying n % (2^0) = 1, that is, all wavelengths, are in the operating mode.

[0107] WDM_1: The wavelengths with the wavelength number n satisfying n % (2^1) = 1, that is, the odd - numbered wavelengths, are in the operating mode.

[0108] WDM_2: The wavelengths with the wavelength number n satisfying n % (2^2) = 1 are in the operating mode, that is, WDM_2 = {1, 5, 9, 13, 17, 21, 25, 29}.

[0109] WDM_3: The wavelengths with the wavelength number n satisfying n % (2^3) = 1 are in the operating mode, that is, WDM_3 = {1, 9, 17, 25}.

[0110] As Figure 5 (a) shows, when the operating wavelength distribution W2D_s = {1, 3, 5, 9, 13, 17, 21, 25, 29, 31} on the optical transmission link operates in the channel distribution mode WDM_1 = {1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, 27, 29, 31}, that is and

[0111]

[0112] When the operating wavelength distribution accidentally drops from W2D_s to W2D_t:

[0113] As Figure 5 (b) shows, if W2D_t = {1, 3, 5, 9, 13}, then directly in the channel distribution mode WDM_1, replace the working wavelengths corresponding to W2D_s - W2D_t = {17, 21, 25, 29, 31} with "padding waves", as Figure 5 (c) shows. After solving the accidental fault, replace the "padding waves" corresponding to W2D_s - W2D_t = {17, 21, 25, 29, 31} with the working wavelengths, as Figure 5 (a) shows.

[0114] In this embodiment, when an accidental wavelength drop occurs, the working wavelength of the dropped wavelength is replaced with a filling wavelength, and the wavelength channel here is filled with the filling wavelength, which can maintain the stability of the wavelength channel distribution pattern when an accidental wavelength drop occurs, and restore the dropped wavelength channel after the fault is eliminated.

[0115] Further, in one embodiment, the optical link power equalization adjustment method may further include the following steps: transmitting a test wavelength, and replacing the wavelength channel where the filling wavelength is located in the wavelength channel distribution pattern by time-division multiplexing; then detecting the transmission performance of each wavelength in the verified wavelength channel distribution pattern under the optical transmission link parameter configuration; and adjusting the distribution and parameter configuration of the filling wavelength based on the detected transmission performance under the optical transmission link parameter configuration.

[0116] In this embodiment, the "filling wavelength" is a set of filling wavelength channels configured at both ends of the optical transmission link to cover the wavelength channel distribution pattern WDM_m (m = 0, 1, 2... M-1), and parameters such as the central wavelength and the optical power entering the fiber of the "filling wavelength" are adjustable. The "test wavelength" is one or more wavelength channels configured at both ends of the optical transmission link for testing the link transmission characteristics and the carrier transmission performance, and parameters such as the central wavelength, channel rate, optical power entering the fiber, modulation format, and error correction coding of the "test wavelength" are adjustable. The "test wavelength" replaces the filling wavelength channel of the wavelength channel distribution pattern WDM_m (m = 0, 1, 2... M-1) by time-division multiplexing to detect the transmission performance of each wavelength in the verified wavelength channel distribution pattern WDM_m (m = 0, 1, 2... M-1).

[0117] In this embodiment, through the cooperation of the test wavelength and the filling wavelength, the parameter configuration of the optical transmission link of the wavelength channel distribution pattern WDM_m (m = 0, 1, 2... M-1) and the parameter configuration of each wavelength channel transceiver can be optimized, and the configuration parameters LC_m (m = 0, 1, 2... M-1) of the optimized optical transmission link and the configuration parameters WC_m (m = 0, 1, 2... M-1) of each wavelength channel transceiver are recorded. Among them, the link configuration parameters include but are not limited to the types and parameter configurations of optical amplifiers, optical attenuators, optical multiplexers / demultiplexers, and optical filters on the link; the channel configuration parameters include the central wavelength, optical power entering the fiber, channel rate, modulation format, error correction coding and other parameter configurations of each wavelength channel transceiver.

[0118] In a second aspect, an embodiment of the present application further provides an optical link power equalization adjustment device.

[0119] In one embodiment, the optical link power equalization adjustment device includes: an adjustment controller, which is used to obtain the optical transmission working wavelength distribution requirements, and select, from M channel distribution modes, a channel distribution mode WDM_k that covers the optical transmission working wavelength distribution requirements and has the smallest number of wavelength channels, and operate the optical transmission working wavelength in the channel distribution mode WDM_k; where the number of wavelength channels in different channel distribution modes is different, and k = 0, 1, 2... M-1.

[0120] Further, as shown in Figure 6 the optical link power equalization adjustment device further includes: a working wavelength transmitter and a working wavelength receiver. The working wavelength transmitter is connected to one end of the optical transmission link through a multiplexer, and the other end of the optical transmission link is connected to the working wavelength receiver through a demultiplexer; a test wave transmitter, which is connected to the multiplexer; a wide-spectrum noise source, which is connected to the multiplexer through a filtering and shaping device; a link monitor, the link detector is connected to the demultiplexer, and the link monitor is signal-connected to the adjustment controller, and the adjustment controller is signal-connected to the filtering and shaping device; the link monitor is used to detect the transmission performance of each wavelength in the verification channel distribution mode under the optical transmission link parameter configuration; the adjustment controller is used to adjust the distribution and parameter configuration of the filling wave generated by the filtering and shaping device based on the detected transmission performance under the optical transmission link parameter configuration.

[0121] As shown in Figure 6 the optical link power equalization adjustment device includes a plurality of working wavelength transmitters and a plurality of working wavelength receivers. The plurality of working wavelength transmitters are respectively OTX_1, OTX_2, OTX_3... OTX_j, and the plurality of working wavelength receivers are respectively ORX_1, ORX_2, ORX_3... ORX_j. The plurality of working wavelength transmitters are all connected to the multiplexer, and the plurality of working wavelength receivers are respectively connected to the demultiplexer. The working wavelength transmitters and the plurality of working wavelength receivers in this embodiment are the above-mentioned channel transceivers. At the transmitting end of the optical transmission link, the test wave transmitter and the plurality of working wavelength transmitters are connected to the optical transmission link through the multiplexer; at the receiving end of the optical transmission link, the link monitor and the working wavelength receiver are connected to the optical transmission link through the demultiplexer. At the transmitting end of the optical transmission link, the wide-spectrum optical noise signal generated by the wide-spectrum noise source, after passing through the filtering and shaping device, generates a set of "filling waves", which are connected to the optical transmission link through the multiplexer. At any time, the working wavelength on the optical transmission link does not conflict with the "filling wave" wavelength.

[0122] The above-mentioned working wavelength refers to the optical carrier signal wavelength that is planned according to the optical transmission link channel construction and actually installed and configured for carrying service data, that is, the wavelength transmitted and received by the working wavelength transmitter and the working wavelength receiver.

[0123] The above-mentioned wide-spectrum noise source refers to an optical signal noise source that can generate optical signals covering the working wavelength range of the optical transmission link; the above-mentioned filtering and shaping device can perform filtering, shaping, and power adjustment processing on the input optical signal according to the control instructions of the adjustment controller to generate a set of filling waves with the central wavelength, channel shape, and fiber input power meeting the expectations.

[0124] The above-mentioned test wave transmitter has the same optical carrier emission function and performance as the working wavelength transmitter of the optical transmission link, and has the ability to adjust and configure parameters such as the central wavelength, fiber input optical power, channel rate, modulation format, and error correction coding. It can cooperate with the link monitor to realize the real-time monitoring of the transmission characteristics, wavelength distribution, optical carrier signal type, and transmission performance of the optical transmission link.

[0125] The above-mentioned link monitor has the same optical carrier reception function and performance as the working wavelength receiver of the optical transmission link, and has the ability to detect and identify parameters such as the central wavelength of the optical signal, signal optical power, channel rate, modulation format, and error correction coding. It can cooperate with the test wave transmitter to realize the real-time monitoring of the transmission characteristics, wavelength distribution, optical carrier signal type, and transmission performance of the optical transmission link.

[0126] The "test wave" in this embodiment replaces the wavelength channels where the filling waves in the wavelength channel distribution mode WDM_m (m = 0, 1, 2... M - 1) are located through time-division multiplexing, and detects and verifies the transmission performance of each wavelength in the wavelength channel distribution mode WDM_m (m = 0, 1, 2... M - 1) under the optical transmission link parameter configuration through the link monitor. The link monitor feeds back the monitoring data of the optical transmission link to the adjustment controller in real time, and the adjustment controller is responsible for controlling the parameter configuration of the "filling wave" generated by the filtering and shaping device. The adjustment controller controls the distribution and parameter configuration of the "filling wave" under the wavelength channel distribution mode WDM_m (m = 0, 1, 2... M - 1) in real time according to the information fed back by the network operation and maintenance management system and the link monitor. Through the cooperation of the "test wave" and the "filling wave", the parameter configuration of the optical transmission link and the parameter configuration of each channel transceiver under the wavelength channel distribution mode WDM_m (m = 0, 1, 2... M - 1) can be optimized.

[0127] It should be noted that the serial numbers of the embodiments of the present application above are only for description and do not represent the superiority or inferiority of the embodiments.

[0128] In the description of the specification, claims and the above-mentioned drawings of this application, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally further include steps or units not listed, or may optionally further include other steps or units inherent to these processes, methods, products or devices. Descriptions such as "first", "second" and "third" are used to distinguish different objects, etc., and do not represent a sequence, nor do they limit that "first", "second" and "third" are different types.

[0129] In the description of the embodiments of this application, words such as "exemplary", "for example" or "for instance" are used to indicate examples, illustrations or explanations. Any embodiment or design solution described as "exemplary", "for example" or "for instance" in the embodiments of this application should not be construed as being more preferred or having more advantages than other embodiments or design solutions. Rather, the use of words such as "exemplary", "for example" or "for instance" is intended to present relevant concepts in a specific manner.

[0130] In the description of the embodiments of this application, unless otherwise specified, " / " means "or". For example, A / B may mean A or B; "and / or" in the text is merely a description of the association relationship between associated objects, indicating that there can be three relationships. For example, A and / or B may mean: A exists alone, A and B exist simultaneously, and B exists alone. In addition, in the description of the embodiments of this application, "a plurality of" means two or more than two.

[0131] In some processes described in the embodiments of this application, a plurality of operations or steps appear in a specific order. However, it should be understood that these operations or steps may not be executed in the order in which they appear in the embodiments of this application or may be executed in parallel. The serial numbers of the operations are only used to distinguish different operations, and the serial numbers themselves do not represent any order of execution. In addition, these processes may include more or fewer operations, and these operations or steps may be executed in sequence or in parallel, and these operations or steps may be combined.

[0132] Through the description of the above embodiments, those skilled in the art can clearly understand that the above-described embodiment methods can be implemented by means of software plus a necessary general hardware platform. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on such an 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 as described above (such as ROM / RAM, magnetic disk, optical disc), and includes several instructions to enable a terminal device to execute the methods described in various embodiments of this application.

[0133] The above are only the preferred embodiments of the present application, and do not limit the patent scope of the present application accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present application, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present application.

Claims

1. A method for adjusting optical link power balance, characterized in that: The optical link power balance adjustment method comprises: Obtain the requirements for wavelength distribution of optical transmission work; Selecting a channel distribution mode WDM_k that covers the wavelength distribution requirements of the optical transmission work and has the least number of wavelength channels from the M channel distribution modes; wherein different channel distribution modes have different numbers of wavelength channels, k=0, 1, 2...M-1; The optical transmission working wavelength is operated in the channel distribution mode WDM_k.

2. The optical link power balancing adjustment method according to claim 1, characterized in that: The number of wavelength channels of the M channel distribution patterns decreases successively, and the channel distribution pattern WDM_i covers the channel distribution pattern WDM_(i+1), where i=0, 1, 2...M-2.

3. The optical link power balancing adjustment method according to claim 1, characterized in that: When the distribution of the optical transmission working wavelength changes, the optical transmission working wavelength is adjusted to operate in a channel distribution mode that covers the changed optical transmission working wavelength and has the least number of channels.

4. The optical link power balancing adjustment method according to claim 3, characterized in that: When the distribution of the optical transmission working wavelength changes, the optical transmission working wavelength is adjusted to a channel distribution mode that covers the changed optical transmission working wavelength and has the least number of channels, including: When the optical transmission working wavelength W2D_s operates in the channel distribution mode WDM_n, and the optical transmission working wavelength increases from W2D_s to W2D_t, wherein n=0, 1, 2...M-2; like and Then, in the channel distribution mode WDM_n, the filling wave of the wavelength channel corresponding to the added working wavelength is replaced with the working wavelength; like and Where p = 0, 1, 2...M-2; and p <n; The optical transmission working wavelength W2D_s is adjusted from the channel distribution mode WDM_n to the channel distribution mode WDM_p, and under the channel distribution mode WDM_p, the filling wave of the wavelength channel corresponding to the added working wavelength is replaced with the working wavelength.

5. The optical link power balancing adjustment method according to claim 4, characterized in that: The step of adjusting the optical transmission working wavelength W2D_s from the channel distribution mode WDM_n to the channel distribution mode WDM_p, and replacing the filling wave of the wavelength channel corresponding to the added working wavelength with the working wavelength under the channel distribution mode WDM_p, comprises: Add filler waves step by step and configure corresponding optical transmission link parameters and wavelength channel parameters, and adjust the optical transmission working wavelength W2D_s from the channel distribution mode WDM_n to the channel distribution mode WDM_p step by step; Then, in the channel distribution mode WDM_p, the filling wave of the wavelength channel corresponding to the added working wavelength is replaced by the working wavelength.

6. The optical link power balancing adjustment method according to claim 3, characterized in that: When the distribution of the optical transmission working wavelength changes, the optical transmission working wavelength is adjusted to a channel distribution mode that covers the changed optical transmission working wavelength and has the least number of channels, including: When the optical transmission working wavelength W2D_s operates in the channel distribution mode WDM_n, and the optical transmission working wavelength is reduced from W2D_s to W2D_t, wherein n=0, 1, 2...M-1; like and Then, in the channel distribution mode WDM_n, the working wavelength of the wavelength channel corresponding to the reduced working wavelength is replaced by a filling wavelength; like and Where p = 0, 1, 2...M-2; and p <n; Then, in the channel distribution mode WDM_n, the working wavelength of the wavelength channel corresponding to the reduced working wavelength is replaced with a filling wavelength, and then the optical transmission link parameters and wavelength channel parameters are adjusted step by step, and unnecessary filling waves are removed, and the channel distribution mode is adjusted step by step from WDM_n to WDM_p.

7. The optical link power balancing adjustment method according to claim 3, characterized in that: When the distribution of the optical transmission working wavelength changes, the optical transmission working wavelength is adjusted to a channel distribution mode that covers the changed optical transmission working wavelength and has the least number of channels, including: When the optical transmission working wavelength W2D_s operates in the channel distribution mode WDM_n, and the optical transmission working wavelength is dropped from W2D_s to W2D_t, wherein n=0, 1, 2...M-1; In the channel distribution mode WDM_n, the working wavelength of the wavelength channel corresponding to the working wavelength of the dropped wave is replaced with a filling wave; when the dropped wave is restored, the filling wave of the wavelength channel corresponding to the working wavelength of the dropped wave is replaced with the working wavelength.

8. The optical link power balance adjustment method according to claim 1, characterized in that: The optical link power balance adjustment method also includes: Transmit the test wave and replace the wavelength channel where the filling wave in the channel distribution pattern is located by time division multiplexing; Detect and verify the transmission performance of each wavelength in the channel distribution mode under the optical transmission link parameter configuration; Based on the detected transmission performance under the optical transmission link parameter configuration, the distribution and parameter configuration of the filling wave are adjusted.

9. An optical link power balance adjustment device, characterized in that: The optical link power balance adjustment device comprises: An adjustment controller is used to obtain the optical transmission working wavelength distribution requirement, and select a channel distribution mode WDM_k that covers the optical transmission working wavelength distribution requirement and has the least number of wavelength channels from M channel distribution modes, and operate the optical transmission working wavelength in the channel distribution mode WDM_k; wherein the number of wavelength channels of different channel distribution modes is different, k=0, 1, 2...M-1.

10. The optical link power balance adjustment device according to claim 9, characterized in that: The optical link power balance adjustment device also includes: A working wavelength transmitter and a working wavelength receiver, wherein the working wavelength transmitter is connected to one end of an optical transmission link through a combiner, and the other end of the optical transmission link is connected to the working wavelength receiver through a splitter; a test wave transmitter connected to the combiner; A wide spectrum noise source, the wide spectrum noise source is connected to the combiner through a filter shaper; A link monitor, wherein the link detector is connected to the splitter, and the link monitor signal is connected to the adjustment controller, and the adjustment controller signal is connected to the filter shaper; the link monitor is used to detect and verify the transmission performance of each wavelength in the channel distribution pattern under the optical transmission link parameter configuration; the adjustment controller is used to adjust the distribution and parameter configuration of the filling wave generated by the filter shaper based on the detected transmission performance under the optical transmission link parameter configuration.

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