Scheduling method and apparatus for space-division-multiplexing optical-fiber communication system, and device and medium

Abstract

Disclosed in the present application are a scheduling method and apparatus for a space-division-multiplexing optical-fiber communication system, and a device and a medium. The scheduling method for a space-division-multiplexing optical-fiber communication system is applied to a space-division-multiplexing optical-fiber communication system, and the space-division-multiplexing optical-fiber communication system comprises an optical add-drop multiplexer and an optical fiber link connected to the optical add-drop multiplexer. The method comprises: for any communication channel in an optical fiber link, before a service signal in the communication channel passes through an optical add-drop multiplexer, performing splitting processing on the service signal, so as to obtain a sample signal and a new service signal; extracting an optical label from the sample signal; and scheduling a new service signal on the basis of a control path signal in the optical label and the optical add-drop multiplexer.

Description

Scheduling methods, devices, equipment and media for space division multiplexing optical fiber communication systems

[0001] Related applications

[0002] This application claims priority to Chinese patent application No. 202410486051.3, filed on April 22, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of optical fiber communication technology, and in particular to a scheduling method, apparatus, equipment and medium for a space division multiplexing optical fiber communication system. Background Technology

[0004] With the development of optical fiber communication technology, the capacity of single-mode fiber is increasingly approaching its inherent nonlinear Shannon limit. To further improve the capacity of optical fiber communication systems, space division multiplexing (SDM) technologies based on few-mode fiber, multi-core fiber, and even few-mode multi-core fiber have received widespread attention. Currently, in any optical fiber communication system, the routing of optical signals typically requires photoelectric conversion, which introduces a certain communication delay.

[0005] The above content is only used to help understand the technical solution of this application and does not represent an admission that the above content is prior art. Summary of the Invention

[0006] The main objective of this application is to provide a scheduling method, apparatus, equipment, and medium for a space division multiplexing optical fiber communication system, aiming to solve the technical problem of communication delay caused by the need for photoelectric conversion of optical signals during the routing process of existing space division multiplexing optical fiber communication systems.

[0007] To achieve the above objectives, this application proposes a scheduling method for a space-division multiplexing optical fiber communication system, applied to the space-division multiplexing optical fiber communication system, which includes an optical add-drop multiplexer and an optical fiber link connected to the optical add-drop multiplexer. The method includes the following steps:

[0008] For any communication channel in the optical fiber link, before the service signal in the communication channel passes through the optical add-drop multiplexer, the service signal is split to obtain a sample signal and a new service signal.

[0009] Extract the optical tag from the sample signal;

[0010] The new service signal is scheduled based on the control path signal in the optical tag and the optical add-drop multiplexer.

[0011] In one feasible implementation, after the step of extracting the optical tag from the sample signal, the method includes:

[0012] Based on the actual carrier frequency signal in the optical tag, the signal status information of the signal passing through the optical add-drop multiplexer is monitored.

[0013] In one feasible implementation, the signal state information includes at least one of optical power, optical signal-to-noise ratio, and crosstalk, and the step of monitoring the signal state information of the signal passing through the optical add-drop multiplexer based on the actual carrier frequency signal in the optical tag includes:

[0014] The sample power of the sample signal is calculated based on the actual carrier frequency signal in the optical tag, the light intensity of the channel where the optical tag is located, the preset modulation depth, and the control path signal in the optical tag; the optical power is calculated based on the sample power, the photodetector calibration coefficient during the optical tag extraction process, the preset modulation depth, and the splitting ratio during the splitting process; and / or

[0015] The optical signal-to-noise ratio (SNR) is calculated based on the single-photon energy, the measurement bandwidth of the optical signal-to-noise ratio, the optical amplifier noise figure, and the optical power; and / or

[0016] The actual carrier frequency signal is subjected to a fast Fourier transform to obtain the signal spectrum; if the signal spectrum has other peaks besides the preset target peak, the crosstalk is calculated based on the first amplitude of the standard carrier frequency signal corresponding to the target peak and the second amplitude of the carrier frequency signal corresponding to the other peaks.

[0017] In one feasible implementation, after the step of determining the signal state information of the fiber optic link associated with the optical add-drop multiplexer based on the actual carrier frequency signal in the optical tag, the method includes:

[0018] The monitoring information is obtained by associating the signal status information with the identification information of the optical add-drop multiplexer.

[0019] The monitoring information is added to the optical tag of the signal passing through the optical add-drop multiplexer.

[0020] In one feasible implementation, the space division multiplexing optical fiber communication system includes a service signal transmitting end, and the scheduling method of the space division multiplexing optical fiber communication system further includes:

[0021] At the transmitting end, an optical tag consisting of a control path signal and a standard carrier frequency signal is loaded onto the service signal.

[0022] In one feasible implementation, the transmitting end includes a tag loading unit, and the step of loading an optical tag composed of a control path signal and a standard carrier frequency signal onto the service signal at the transmitting end includes:

[0023] For any communication channel in the space division multiplexing optical fiber communication system, the tag loading unit loads an optical tag into the service signal of the communication channel. The optical tag consists of a control path signal corresponding to the service signal and a standard carrier frequency signal corresponding to the service signal. In communication channels with a preset coupling relationship, the optical tags loaded into the service signals are the same. Alternatively, communication channels with a preset coupling relationship are combined into a joint channel, and the optical tags loaded into each service signal in the joint channel are the same.

[0024] In one feasible implementation, the step of extracting the optical tag from the sample signal includes:

[0025] The detection signal obtained from the sample signal by a photodetector;

[0026] The detection signal is sequentially amplified by transimpedance and converted from analog to digital to obtain the processing result, and the optical tag is extracted from the processing result.

[0027] Furthermore, to achieve the above objectives, this application also proposes a scheduling device for a space-division multiplexing optical fiber communication system, applied to the space-division multiplexing optical fiber communication system, wherein the space-division multiplexing optical fiber communication system includes an optical add-drop multiplexer and an optical fiber link connected to the optical add-drop multiplexer, and the device includes:

[0028] The optical splitting module is used to split the service signal in any communication channel of the optical fiber link before the service signal in the communication channel passes through the optical add-drop multiplexer to obtain a sample signal and a new service signal.

[0029] The extraction module is used to extract the optical tag from the sample signal;

[0030] The scheduling module is used to schedule the new service signal based on the control path signal in the optical tag and the optical add-drop multiplexer.

[0031] In addition, to achieve the above objectives, this application also proposes a scheduling device for a space division multiplexing optical fiber communication system. The device includes a memory, a processor, and a computer program stored in the memory and executable on the processor. The computer program is configured to implement the steps of the scheduling method for the space division multiplexing optical fiber communication system as described above.

[0032] In addition, to achieve the above objectives, this application also proposes a medium, which is a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the steps of the scheduling method for the space division multiplexing optical fiber communication system as described above.

[0033] One or more technical solutions proposed in this application have at least the following technical effects:

[0034] The scheduling method for a space-division multiplexing optical fiber communication system according to this application embodiment is applied to a space-division multiplexing optical fiber communication system, which includes an optical add-drop multiplexer and an optical fiber link connected to the optical add-drop multiplexer. For any communication channel in the optical fiber link, before the service signal in the communication channel passes through the optical add-drop multiplexer, the service signal is split to obtain a sample signal and a new service signal; an optical tag is extracted from the sample signal; and the new service signal is scheduled based on the control path signal in the optical tag and the optical add-drop multiplexer. That is, in the space-division multiplexing optical fiber communication system of this application embodiment, it is only necessary to convert the sample signal to extract the optical tag, and then directly complete the scheduling of the new service signal through the control path signal in the optical tag and the optical add-drop multiplexer. Compared with the existing solution, this application eliminates the step of photoelectric-optical conversion of the service signal, thereby achieving the technical effect of reducing the communication latency of the space-division multiplexing optical fiber communication system. Attached Figure Description

[0035] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0036] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 is a flowchart illustrating an embodiment of the scheduling method for the spatial multiplexing optical fiber communication system of this application.

[0038] Figure 2 is a basic flowchart of the scheduling method for extracting optical tags in the spatial multiplexing optical fiber communication system of this application.

[0039] Figure 3 is a schematic diagram of the scenario in which optical tags are extracted by FFT in the scheduling method of the spatial multiplexing optical fiber communication system of this application;

[0040] Figure 4 is a schematic diagram of the scenario in which the scheduling method of the spatial multiplexing optical fiber communication system of this application obtains optical tags through square law detection.

[0041] Figure 5 is a flowchart illustrating an embodiment of the scheduling method for the spatial multiplexing optical fiber communication system of this application.

[0042] Figure 6 is a flowchart illustrating an embodiment of the scheduling method for the spatial multiplexing optical fiber communication system of this application.

[0043] Figure 7 is a schematic diagram of adding optical tags to the external high-speed VOA of the modulator in the scheduling method of the space division multiplexing optical fiber communication system of this application.

[0044] Figure 8 is a schematic diagram of the standard structure of the high-speed coherent modulator in the scheduling method of the space division multiplexing optical fiber communication system of this application.

[0045] Figure 9 is a schematic diagram of the scenario of loading optical tags in the electrical domain in the scheduling method of the spatial multiplexing optical fiber communication system of this application;

[0046] Figure 10 is a schematic diagram of the joint channel in the scheduling method of the space division multiplexing optical fiber communication system of this application;

[0047] Figure 11 is a schematic diagram of the module structure of the scheduling device of the space division multiplexing optical fiber communication system according to an embodiment of this application;

[0048] Figure 12 is a schematic diagram of the hardware operating environment of the scheduling method of the space division multiplexing optical fiber communication system in the embodiments of this application;

[0049] Figure 13 is a flowchart illustrating an embodiment of the scheduling method for the spatial multiplexing optical fiber communication system of this application.

[0050] Figure 14 is a flowchart illustrating an embodiment of the scheduling method for the spatial multiplexing optical fiber communication system of this application.

[0051] Figure 15 is a flowchart illustrating an embodiment of the scheduling method for the spatial multiplexing optical fiber communication system of this application.

[0052] The purpose, features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0053] It should be understood that the specific embodiments described herein are merely illustrative of the technical solutions of this application and are not intended to limit this application.

[0054] To better understand the technical solution of this application, a detailed description will be provided below in conjunction with the accompanying drawings and specific implementation methods.

[0055] The main solution of this application embodiment is: for any space division multiplexing optical fiber communication system, when the space division multiplexing optical fiber communication system needs to route the service signal (i.e., optical signal) in the communication channel at the optical add-drop multiplexer, the service signal is split into sample signals and new service signals, and then the new service signals are scheduled by the optical tags extracted from the sample signals and the optical add-drop multiplexer.

[0056] Because existing space division multiplexing optical fiber communication systems require photoelectric conversion of optical signals for routing, and this conversion process involves converting the optical signal into an electrical signal, extracting routing information from the electrical signal, and then converting the electrical signal back into an optical signal for routing, existing technical solutions require multiple signal conversions, resulting in communication delays.

[0057] This application provides a solution that extracts a control path signal from the sample signal obtained by optical splitting. The control path signal can be used to split the optical signal to obtain a new service signal for scheduling (i.e., routing), thereby avoiding the photoelectric-optical conversion step for the service data involved in scheduling, thus reducing communication latency.

[0058] It should be noted that the execution subject of this embodiment can be a computing service device with data processing, network communication and program running functions, such as a tablet computer, personal computer, mobile phone, etc., or an electronic device that can realize the above functions, or a space division multiplexing optical fiber communication system that has built-in devices that can realize the above functions, etc.

[0059] Based on this, this application provides a scheduling method for a space division multiplexing optical fiber communication system. Referring to Figure 1, Figure 1 is a flowchart illustrating an embodiment of the scheduling method for a space division multiplexing optical fiber communication system of this application.

[0060] In this embodiment, the scheduling method of the space-division multiplexing optical fiber communication system is applied to the space-division multiplexing optical fiber communication system, which includes an optical add-drop multiplexer and an optical fiber link connected to the optical add-drop multiplexer. The method includes steps S10 to S30:

[0061] Step S10: For any communication channel in the optical fiber link, before the service signal in the communication channel passes through the optical add-drop multiplexer, the service signal is split to obtain a sample signal and a new service signal.

[0062] It should be noted that the scheduling method of the above-mentioned space-division multiplexing optical fiber communication system is applied to space-division multiplexing optical fiber communication systems. These systems can be weakly coupled multi-core single-mode optical fiber systems, weakly coupled sparsely multiplexed mode-division multiplexing optical fiber systems, weakly coupled mode-division multiplexing optical fiber systems with degenerate modes, quasi-degenerate mode-with strong coupling optical fiber systems, strongly coupled multi-core optical fiber systems, strongly coupled few-mode optical fiber systems, multi-core few-mode optical fiber systems, wavelength-division multiplexing space-division multiplexing optical fiber systems, etc. A space-division multiplexing optical fiber communication system includes at least an optical add-drop multiplexer (ROADM) and an optical fiber link connected to the ROADM. Different types of space-division multiplexing optical fiber communication systems may include different devices, the specific devices depending on the type of space-division multiplexing optical fiber communication system, which will not be elaborated here. The optical fiber link includes at least one communication channel, which may be a spatial channel within the optical fiber link, or a wavelength channel within a spatial channel. The optical signal transmitted in the communication channel is the service signal in the aforementioned communication channel.

[0063] For example, in any communication channel of an optical fiber link, the service signal in that communication channel is split before passing through an optical add-drop multiplexer (which can be any optical add-drop multiplexer in a space-division multiplexing optical fiber communication system). For instance, the service signal can be split using an optical coupler (OC, also known as a beam splitter) to obtain optical signals of different proportions, i.e., to obtain a sample signal and a new service signal. The proportion of the sample signal is less than the proportion of the new service signal. Typically, the proportion of the sample signal is 1% to 5%, preferably 1%. It should also be noted that those skilled in the art can also select other types of beam splitters for splitting, which will not be elaborated here.

[0064] Furthermore, taking a multi-core single-mode fiber system as an example, in this fiber optic communication system, there are N cores in the fiber optic link. Correspondingly, the fiber optic communication system may include N modulators. The signals modulated by the N modulators are multiplexed onto the multi-core fiber optic link by a core demultiplexer. At a ROADM node, the multi-core fiber optic link can split the multi-core data into N standard single-mode fibers through a core demultiplexer. Each standard single-mode fiber can be considered as corresponding to a communication channel. The service signals in each communication channel are then split into optical signals.

[0065] Step S20: Extract the optical tag from the sample signal;

[0066] It should be noted that in this embodiment, when transmitting service signals at the signal transmitting end, optical tags are loaded into the service signals. Correspondingly, the sample signals obtained by beam splitting will also include optical tags.

[0067] For example, the sample signal can be input into a low-speed photodetector (PD), and the detection result can be converted into an analog-to-digital converter (ADC) to obtain an optical tag.

[0068] In one feasible implementation, as shown in FIG13, step S20 may include steps S21 to S22:

[0069] Step S21: Obtain the detection signal from the sample signal using a photodetector;

[0070] Step S22: The detection signal is sequentially amplified by transimpedance and converted from analog to digital to obtain the processing result, and the optical tag is extracted from the processing result.

[0071] For example, the sample signal is input to a photodetector, which converts it into an electrical signal, i.e., a detection signal. This detection signal is then input to a TIA (Trans-Impedance Amplifier) ​​for transimpedance amplification. The amplified result is then converted from analog to digital to obtain the processed result. This processed result can be input to a corresponding tag extraction DSP chip (Digital Signal Processor). For example, referring to Figure 2, which shows the basic flowchart of the optical tag extraction in this application, the sample signal sequentially passes through the PD, TIA, ADC, and DSP to complete the optical tag extraction. The DSP chip can execute different optical tag extraction methods. For example, the optical tag can be obtained by performing an FFT (Fast Fourier Transform) on the processed result. Referring to Figure 3, which shows a scenario of optical tag extraction via FFT in this application, the processed result sequentially undergoes O / E photoelectric conversion, ADC conversion, S / P parallel-to-serial conversion, FFT conversion, and P / S serial-to-parallel conversion, followed by smoothing filtering and resampling, and then L... k The optical tag is obtained by (optical tag) decision, or by performing square law detection on the processing result. For example, as shown in Figure 4, which is a schematic diagram of the scenario in this application where the optical tag is obtained by square law detection, the above processing result is sequentially processed by O / E conversion, ADC conversion, BPF (band-pass filter), square processing, LPF (low-pass filter), and decoding to obtain the optical tag.

[0072] Step S30: Schedule the new service signal based on the control path signal in the optical tag and the optical add-drop multiplexer.

[0073] It should be noted that the optical tag includes control path information (i.e., routing information). This control path information can point to the target service address of the service signal, or it can include the addresses of intermediate terminals that must be traversed to reach the target service. The control path information is the basis for the optical add-drop multiplexer to perform scheduling.

[0074] For example, the control logic layer in the optical add-drop multiplexer can be controlled by the control path signal to directly switch the new service signal to the target path, that is, to switch the new service signal to the channel leading to the target service end, thereby completing the scheduling of the new service signal.

[0075] In this embodiment, the scheduling method for a space-division multiplexing optical fiber communication system is applied to the system, which includes an optical add-drop multiplexer (ODL) and an optical fiber link connected to it. For any communication channel in the optical fiber link, before the service signal passes through the ODL, the service signal is split to obtain a sample signal and a new service signal. An optical tag is extracted from the sample signal. The new service signal is then scheduled based on the control path signal in the optical tag and the ODL. In other words, in the space-division multiplexing optical fiber communication system of this embodiment, only the sample signal needs to be converted to extract the optical tag, and then the new service signal is directly scheduled using the control path signal in the optical tag and the ODL. Compared with existing solutions, this application eliminates the step of photoelectric-optical conversion of the service signal, thereby achieving the technical effect of reducing the communication latency of the space-division multiplexing optical fiber communication system.

[0076] Furthermore, it should be noted that, since this application does not require photoelectric-optical conversion of service signals when scheduling service signals, the transmission of service signals can be uninterrupted, reducing intrusion into the signal transmission process of the spatial division multiplexing optical fiber communication system.

[0077] In one embodiment, referring to Figure 5, after step S20, the scheduling method of the space division multiplexing optical fiber communication system further includes step S40:

[0078] Step S40: Monitor the signal status information of the signal passing through the optical add-drop multiplexer based on the actual carrier frequency signal in the optical tag.

[0079] It should be noted that, in this embodiment, the optical tag extracted from the sample signal includes not only the control path signal but also the actual carrier frequency signal. It is important to note that the actual carrier frequency signal is the result of the standard carrier frequency signal being transmitted through the optical fiber link. The carrier frequency signal (including the aforementioned actual carrier frequency signal and the standard carrier frequency signal, also referred to as the tone signal) reflects the signal state of the service signal in the channel.

[0080] For example, the signal status information of signals passing through the optical add-drop multiplexer can be determined by the actual carrier frequency signal in the optical tag. That is, since the standard carrier frequency signal corresponding to the actual carrier frequency signal is known, the signal status information of the signal passing through the optical add-drop multiplexer can be determined by whether the actual carrier frequency signal is present in the optical tag, or by the difference between the actual carrier frequency signal and the standard carrier frequency signal, which means determining whether the channel for transmitting signals is normal.

[0081] It is understood that, in this embodiment, since the obtained signal status information is associated with the optical add-drop multiplexer, the signal status (or channel status) at different locations in the space division multiplexing optical fiber communication system can be monitored, thereby realizing distributed monitoring of the space division multiplexing optical fiber communication system. Compared with centralized monitoring, this application can obtain the status information of signals or channels at different locations on the optical fiber link, thereby improving the convenience of fault early warning and fault finding.

[0082] In one feasible implementation, the signal state information includes at least one of optical power, optical signal-to-noise ratio, and crosstalk, and step S40 may include steps S41 to S43:

[0083] Step S41: Calculate the sample power of the sample signal based on the actual carrier frequency signal in the optical tag, the light intensity of the channel where the optical tag is located, the preset modulation depth, and the control path signal in the optical tag; calculate the optical power based on the sample power, the photodetector calibration coefficient during the optical tag extraction process, the preset modulation depth, and the splitting ratio in the splitting process; and / or, Step S42: Calculate the optical signal-to-noise ratio based on the single photon energy, the measurement bandwidth of the optical signal-to-noise ratio, the preset optical amplifier noise index, and the optical power; and / or, Step S43: Perform a fast Fourier transform on the actual carrier frequency signal to obtain the signal spectrum; if the signal spectrum has other peaks besides the preset target peak, calculate the crosstalk based on the first amplitude of the standard carrier frequency signal corresponding to the target peak and the second amplitude of the carrier frequency signal corresponding to the other peaks.

[0084] It should be noted that the signal state information determined by the actual carrier frequency signal may include at least one of optical power, optical signal-to-noise ratio and crosstalk. Preferably, the signal state information includes optical power, optical signal-to-noise ratio and crosstalk.

[0085] For example, in the scenario of calculating optical power, the sample power of the sample signal can be calculated using the actual carrier frequency signal in the optical tag, the optical intensity of the channel where the optical tag is located, the preset modulation depth, and the control path signal in the optical tag. The formula for calculating the sample power is as follows: P Label,ij =I i,j mcos(2πf i,j t)Li,j (t)

[0086] In the formula, ij (or i, j) represents the i-th wavelength channel under the j-th spatial channel, t characterizes the change with time, and P Label,ij For the sample power, I i,j Let be the light intensity of channel (i,j), and m be the preset modulation depth (typically within the range of 0.1 to 0.5). i,j f represents the amplitude of the light tag. i,j L is the actual carrier frequency signal in the optical tag. i,j (t) represents the control path signal in the optical tag.

[0087] Furthermore, the optical power is calculated using the sample power, the photodetector calibration coefficient during the optical tag extraction process, the preset modulation depth, and the splitting ratio during spectral processing. The formula for calculating the optical power is as follows:

[0088] In the formula, ij (or i, j) represents the i-th wavelength channel under the j-th spatial channel, and P Label,ij P is the sample power of the sample signal. ch,ij The expression represents optical power, m is the preset modulation depth, α is the splitting ratio (for example, if the coupler ratio is 1:99, then α equals 1%), and f(V) PD ) represents the calibration coefficient of the photodetector.

[0089] It is understood that the optical power calculated above is the optical power of the service signal in a certain channel. If it is necessary to determine the overall optical power of the fiber optic link, the following calculation formula can be used:

[0090] In the formula, i represents the wavelength channel, N is the number of wavelengths, j represents the spatial channel, D is the number of spatial channels, and f i,j L is the actual carrier frequency signal in the optical tag. i,j (t) represents the control path signal in the optical tag, and P represents the total optical power in the optical fiber link.

[0091] For example, when calculating the optical signal-to-noise ratio (SNR), the calculation of the SNR based on single-photon energy, the measurement bandwidth of the SNR, the optical amplifier noise figure, and the optical power includes the following steps:

[0092] The optical amplifier gain of the optical amplifier (e.g., SOA, Semiconductor Optical Amplifier) ​​in the space-division multiplexing optical fiber communication system is calculated using the aforementioned optical power. Specifically, the optical power calculated using the sample power, the photodetector calibration coefficient during the optical tag extraction process, the preset modulation depth, and the splitting ratio in the splitting process is used as the output optical power after amplification. The optical amplifier gain is then calculated using the input and output optical power. The input optical power can be obtained using the same calculation or monitoring method as when determining the output optical power, which will not be elaborated here. After determining the optical amplifier gain, the ASE (Amplified Spontaneous Emission) noise generated by the optical amplifier is calculated using the single-photon energy, the measurement bandwidth of the optical signal-to-noise ratio, the preset optical amplifier noise figure, and the optical amplifier gain. Finally, the optical signal-to-noise ratio is calculated using the ASE noise and the aforementioned output optical power.

[0093] The formula for calculating the optical amplifier gain is as follows: G(dB)=P out,(i,j) (dBm)-P in,(i,j) (dBm)

[0094] In the formula, (i, j) represents the i-th wavelength channel under the j-th spatial channel, G is the optical amplifier gain, and P out,(i,j) For output optical power, P in,(i,j) The input optical power is expressed in dB as a relative value and dBm as a power unit.

[0095] Furthermore, the formula for calculating the ASE noise generated by the optical amplifier is as follows: ASE(dBm)=10log[hvB0]+NF(dB)+G(dB)

[0096] In the formula, hv is the single photon energy, B0 is the measurement bandwidth of the optical signal-to-noise ratio (e.g., 12.5 GHz), NF is the noise figure of the optical amplifier (which can be measured in advance), G is the optical amplifier gain, dB is the unit of relative value, and dBm is the unit of power. Among them, 10log[hvB0] is usually -58 (dBm).

[0097] After obtaining the ASE noise, the optical signal-to-noise ratio (OSNR) is calculated based on the optical power (i.e., the output optical power) obtained by calculating the sample power, the photodetector calibration coefficient during the optical tag extraction process, the preset modulation depth, and the splitting ratio in the spectral processing, as well as the ASE noise. The formula for calculating the OSNR is as follows: (i,j) (dB)=P out,(i,j) (dBm)-ASE (i,j) (dBm)

[0098] In the formula, (i, j) represents the i-th wavelength channel under the j-th spatial channel, OSNR is the optical signal-to-noise ratio of the signal after optical amplification, ASE(i, j) is the spontaneous emission amplification noise of the signal after optical amplification, and P out,(i,j) Output optical power, dB is a relative value unit, and dBm is a power unit.

[0099] It should also be noted that the above steps are for obtaining the optical signal-to-noise ratio after a single optical amplification. In practical applications, the optical signal-to-noise ratio is obtained through multiple optical amplifications. After K optical amplifications, the cumulative ASE noise is calculated as follows:

[0100] In the formula, (i, j) represents the i-th wavelength channel under the j-th spatial channel, ASE sum(i,j),K The accumulated ASE noise is calculated after k optical amplifications, where K is the total number of optical amplifications, NF is the noise figure of the kth optical amplification, and P... out,(i,j),k P represents the output optical power corresponding to the k-th optical amplification. in,(i,j),k denoted as the input optical power corresponding to the k-th optical amplification, dB is the relative value unit, and dBm is the power unit.

[0101] Furthermore, after determining the accumulated ASE noise, the accumulated optical signal-to-noise ratio (OSNR) is calculated using the ASE noise. The formula for calculating the accumulated OSNR is as follows: OSNR (i,j),K (dB)=P out,(i,j),K (dBm)-ASE sum(i,j),K (dBm)

[0102] In the formula, (i, j) represents the i-th wavelength channel under the j-th spatial channel, ASE sum(i,j),k To accumulate ASE noise after k optical amplifications, P out,(i,j),K The OSNR is the cumulative output power after k optical amplifications. (i,j),K The cumulative optical signal-to-noise ratio after k optical amplifications.

[0103] For example, when calculating crosstalk, the extracted actual carrier frequency signal is first subjected to a Fast Fourier Transform to obtain the signal spectrum. It is worth noting that in the absence of crosstalk, the signal spectrum typically only contains a preset target peak corresponding to the standard carrier frequency signal. Conversely, if crosstalk exists, the signal spectrum will contain other peaks besides the preset target peak. Accordingly, if other peaks exist in the signal spectrum, crosstalk is calculated based on the first amplitude of the standard carrier frequency signal corresponding to the target peak and the second amplitude of the carrier frequency signals corresponding to the other peaks. For example, the ratio between the first amplitude and the second amplitude can be used as the crosstalk.

[0104] In one feasible implementation, as shown in FIG14, after step S40, the method includes steps S51 to S52:

[0105] Step S51: Associate the signal status information and the identification information of the optical add-drop multiplexer to obtain monitoring information;

[0106] Step S52: Add the monitoring information to the optical tag of the path signal passing through the optical add-drop multiplexer.

[0107] For example, after calculating the signal status information of the signal passing through the add-drop multiplexer, the signal status information is associated with the identification information of the add-drop multiplexer to obtain monitoring information, which can be stored. When a signal passes through the add-drop multiplexer again, the monitoring information can be added to the optical tag of the signal passing through the add-drop multiplexer again. Typically, the monitoring information is added to the control path signal in the optical tag; for example, a specific area can be divided in the control path signal for writing the monitoring information. When the optical signal receiver in the space-division multiplexing optical fiber communication system receives the optical signal, it can extract the optical tag from the optical signal and parse the extracted optical tag to obtain the monitoring information, thereby realizing distributed monitoring of the space-division multiplexing optical fiber communication system. Furthermore, during the backhaul of monitoring information, it can be backhauled using the existing optical tag in the optical signal, without the need for additional fiber optic cables or additional wavelengths to build a backhaul channel. This ensures the convenience of signal status monitoring.

[0108] In one embodiment, referring to Figure 6, before step S10, the scheduling method of the space division multiplexing optical fiber communication system further includes step S100:

[0109] In step S100, an optical tag consisting of a control path signal and a standard carrier frequency signal is loaded onto the service signal at the transmitting end.

[0110] For example, the space division multiplexing optical fiber communication system further includes a service signal transmitter, which is used to transmit service signals and load optical tags into the service signals. The optical tags are composed of control path signals and standard carrier frequency signals. The control path signals are the basis for scheduling service signals at the optical add-drop multiplexer, while the standard carrier frequency signals are the basis for monitoring the signal status of service signals after transmission in the optical fiber link.

[0111] In one feasible implementation, the transmitter includes a tag loading unit, as shown in FIG15, and step S100 includes step S101:

[0112] For any communication channel in the space division multiplexing optical fiber communication system, the tag loading unit loads an optical tag into the service signal of the communication channel. The optical tag consists of a control path signal corresponding to the service signal and a standard carrier frequency signal corresponding to the service signal. In communication channels with a preset coupling relationship, the optical tags loaded into the service signals are the same. Alternatively, communication channels with a preset coupling relationship are combined into a joint channel, and the optical tags loaded into each service signal in the joint channel are the same.

[0113] For example, the transmitter may include a tag loading unit. For any communication channel in a space division multiplexing optical fiber communication system, the tag loading unit loads an optical tag into the service signal of the communication channel. The loaded optical tag consists of a control path signal corresponding to the service signal and a standard carrier frequency signal corresponding to the service signal.

[0114] It should be noted that in practical applications, the tag loading unit included in the transmitter can be configured by technicians according to the actual scenario requirements. For example, the tag loading unit can be a polarization-multiplexed IQ modulator or a high-speed coherent modulator. There are also various ways to load optical tags using a modulator. For example, it can be added through an external high-speed VOA (variable optical attenuator), as shown in Figure 7, which is a schematic diagram of adding optical tags using an external high-speed VOA in this application. Optical tags can also be added using auxiliary devices integrated into the high-speed coherent modulator (see Figure 8, which is a schematic diagram of the standard structure of the high-speed coherent modulator in this application). For example, pre-SOA, post-SOA, or internal VOA control devices can be integrated into the high-speed coherent modulator to load optical tags. Alternatively, a series of phase modulators PHASE-iP(N) (i = 1, 2, 3, 4) with bias phase control can be used to load optical tags.

[0115] Furthermore, there are various forms of optical tag loading, such as electrical domain loading and optical domain loading. Referring to Figure 9, which is a schematic diagram of an electrical domain loading scenario for optical tags in this application, during electrical domain loading, the service signal includes four channels: XI, XQ, YI, and YQ. Each channel is multiplied by a corresponding tag factor in the digital domain.

[0116] In the formula, m k For modulation depth (typically within the range of 0.1 to 0.5), L k The signal is a low-speed signal that carries control signals and transmits monitoring information. f is the carrier frequency of the optical tag. In practical applications, each fiber core in an optical fiber link can be assigned a separate and different carrier frequency to identify the fiber core channel, i.e., the spatial channel.

[0117] The signals XI, XQ, YI, and YQ in each core are multiplied by the tag factor and modulated by a modulator. These modulated signals are then multiplexed into a multi-core fiber optic link via a core demultiplexer. When passing through a ROADM node, the multi-core fiber optic link can split the multi-core data into N standard single-mode fibers using a core demultiplexer. Correspondingly, each standard single-mode fiber can correspond to a communication channel. The service signal in each communication channel will be split by a coupler to extract the optical tag. The subsequent process can be referred to the above embodiment, and will not be repeated here.

[0118] During optical domain loading, an SOA can be added via a VOA, an intensity modulator, or an IQ modulator, and its optical power variation satisfies: P out =P in (1+m k L k sin(2πft))

[0119] In the formula, P in P is the optical power before loading the optical tag. out For the optical tag after loading the optical tag, m k For modulation depth (typically within the range of 0.1 to 0.5), L k It is a low-speed signal that carries control signals and transmits monitoring information; f is the carrier frequency of the optical tag.

[0120] Furthermore, it should be noted that, under normal circumstances, the optical tags loaded on the service signals in different communication channels are different. However, the optical tags loaded on the service signals in communication channels with a pre-defined coupling relationship are the same. This pre-defined coupling relationship is a strong coupling relationship with a coupling degree greater than a pre-defined threshold. It should be noted that, since the service signals in communication channels with a pre-defined coupling relationship are related, MIMO (Multiple-input Multiple-output) joint processing is required to decompose the data carried in each service signal. Therefore, the same optical tag needs to be loaded on the service signals in communication channels with a pre-defined coupling relationship, so that each service signal can be sent to the same target service terminal for joint processing. In practical applications, communication channels with a pre-defined coupling relationship can also be combined into a joint channel (i.e., a super-channel), and correspondingly, the optical tags loaded on the service signals in the joint channel are the same.

[0121] In different space-division multiplexing optical fiber communication systems, different coupling relationships may exist between the communication channels. For example, in a weakly coupled multi-core single-mode optical fiber system, the communication channels in this system are weakly coupled, so the optical tags of the service signals in each communication channel are different.

[0122] For weakly coupled sparse multiplexing mode-division multiplexing fiber systems, LP is mainly used. 0n The mode is used to transmit signals, because LP 0n The mode spacing between modes is relatively large, that is, the coupling degree is relatively small, and the optical tags of the service signals in each communication channel of this system are different.

[0123] In a weakly coupled mode-division multiplexing fiber optic system with degenerate modes, the communication channels corresponding to different modes are weakly coupled, so each communication channel can independently use different optical tags. However, degenerate modes, such as LP... 11a and LP 11b Model, LP 21a and LP 21b The modes are strongly coupled. In this case, the communication channels corresponding to degenerate modes are identified by the same tag signal, and the two communication channels (spatial channels) corresponding to the degenerate modes are sent together as a spatial super-channel at the ROADM node to the same target service. Since degenerate modes are generally divided into odd and even modes, and each mode has two polarization states, the receiving side usually needs to perform 4x4 MIMO joint processing to separate the data. Therefore, at the ROADM node, the degenerate modes need to be sent together to the same target service.

[0124] For fiber optic systems with strong coupling within quasi-degenerate modes and weak coupling between non-quasi-degenerate modes, quasi-degenerate modes can be treated as a single spatial super-channel for conversion in ROADM. Consequently, all quasi-degenerate modes have the same optical tag loaded onto the service signal in the corresponding communication channel. Conversely, non-quasi-degenerate modes can have different optical tags superimposed on the service signal in the corresponding communication channel for independent processing. For the LPmn series modes, a quasi-degenerate mode refers to a group of modes whose primary mode designation satisfies P = 2n + m - 1, and which have similar propagation constants forming a mode group. For example, the first mode group includes the LP01 mode, resulting in two modes including polarization; the second mode group includes LP11a and LP11b modes, plus two polarization states, resulting in four modes. The first two mode groups are classified the same as those in weakly coupled mode-division multiplexing fiber optic systems with degenerate modes; the third mode group combines LP02, LP21a, and LP21b modes into one mode group because their propagation constants are similar. Adding their respective two polarizations, there are a total of 6 modes… and so on. Within the quasi-degenerate modes, the communication channels corresponding to the mode groups have strong coupling relationships, requiring joint processing using 2Px2P MIMO. Therefore, at the ROADM node, the P-channel communication channels corresponding to the quasi-degenerate modes should be jointly scheduled; otherwise, the receiving side will be unable to process the received service signals. Correspondingly, the optical tags for the communication channels corresponding to the quasi-degenerate modes are the same.

[0125] For strongly coupled multi-core optical fiber systems and strongly coupled few-mode space-division multiplexing optical fiber communication systems, all communication channels (or spatial channels) in the optical fiber system are treated as a whole and jointly scheduled. Accordingly, the same optical tag is loaded onto the service signals in all communication channels.

[0126] For fiber optic systems based on multi-core few-mode, different optical tags can be loaded onto the communication channels in weakly coupled communication channels (or spatial channels) to serve as independent transmission channels. The corresponding ROADM will then switch to different target service terminals. Meanwhile, the same optical tag will be loaded onto the signals of pre-set strongly coupled communication channels, and joint scheduling will be performed at the ROADM.

[0127] For wavelength division multiplexing (WDM) and space division multiplexing (SDM) fiber optic systems, different optical tags can be assigned to different spatial channels and wavelength channels. Spatial channels with pre-defined strong coupling relationships and jointly processed wavelength channels are assigned the same optical tag. For example, referring to Figure 10, which is a schematic diagram of the joint channel in this application, the jointly processed spatial channel is treated as a spatial super-channel (Spatial superchannel in Figure 10), and the jointly processed wavelength channel is treated as a wavelength super-channel (spectral superchannel in Figure 10). The channel that jointly processes the wavelength and multiple spatial channels is called a hybrid super-channel (Hybrid superchannel in Figure 10). A single super-channel is loaded with the same optical tag and processed jointly at the ROADM and the receiving side. In other cases, different communication channels can be loaded with different optical tags.

[0128] It should be noted that the above examples are only for understanding this application and do not constitute a limitation on the scheduling method of the spatial multiplexing optical fiber communication system of this application. Any simple modifications based on this technical concept are within the protection scope of this application.

[0129] This application also provides a scheduling device for a space-division multiplexing optical fiber communication system, applied to the space-division multiplexing optical fiber communication system. The space-division multiplexing optical fiber communication system includes an optical add-drop multiplexer and an optical fiber link connected to the optical add-drop multiplexer. Referring to Figure 11, the scheduling device for the space-division multiplexing optical fiber communication system includes:

[0130] The optical splitting module 10 is used to split the service signal in any communication channel of the optical fiber link before the service signal in the communication channel passes through the optical add-drop multiplexer to obtain a sample signal and a new service signal.

[0131] Extraction module 20 is used to extract optical tags from the sample signal;

[0132] The scheduling module 30 is used to schedule the new service signal based on the control path signal in the optical tag and the optical add-drop multiplexer.

[0133] In one feasible implementation, the scheduling device of the space division multiplexing optical fiber communication system further includes a monitoring module 40, the monitoring module 40 being used for:

[0134] Based on the actual carrier frequency signal in the optical tag, the signal status information of the signal passing through the optical add-drop multiplexer is monitored.

[0135] In one feasible implementation, the signal status information includes at least one of optical power, optical signal-to-noise ratio, and crosstalk, and the monitoring module 40 is further used for:

[0136] The sample power of the sample signal is calculated based on the actual carrier frequency signal in the optical tag, the light intensity of the channel where the optical tag is located, the preset modulation depth, and the control path signal in the optical tag; the optical power is calculated based on the sample power, the photodetector calibration coefficient during the optical tag extraction process, the preset modulation depth, and the splitting ratio during the splitting process; and / or

[0137] The optical signal-to-noise ratio (SNR) is calculated based on the single-photon energy, the measurement bandwidth of the optical signal-to-noise ratio, the optical amplifier noise figure, and the optical power; and / or

[0138] The actual carrier frequency signal is subjected to a fast Fourier transform to obtain the signal spectrum; if the signal spectrum has other peaks besides the preset target peak, the crosstalk is calculated based on the first amplitude of the standard carrier frequency signal corresponding to the target peak and the second amplitude of the carrier frequency signal corresponding to the other peaks.

[0139] In one feasible implementation, the monitoring module 40 is further configured to:

[0140] The monitoring information is obtained by associating the signal status information with the identification information of the optical add-drop multiplexer.

[0141] The monitoring information is added to the optical tag of the signal passing through the optical add-drop multiplexer.

[0142] In one feasible implementation, the space division multiplexing optical fiber communication system includes a service signal transmitting end, and the scheduling device of the space division multiplexing optical fiber communication system further includes a loading module 50, the loading module 50 being used for:

[0143] At the transmitting end, an optical tag consisting of a control path signal and a standard carrier frequency signal is loaded onto the service signal.

[0144] In one feasible implementation, the transmitter includes a tag loading unit, and the loading module 50 is further configured to:

[0145] For any communication channel in the space division multiplexing optical fiber communication system, the tag loading unit loads an optical tag into the service signal of the communication channel. The optical tag consists of a control path signal corresponding to the service signal and a standard carrier frequency signal corresponding to the service signal. In communication channels with a preset coupling relationship, the optical tags loaded into the service signals are the same. Alternatively, communication channels with a preset coupling relationship are combined into a joint channel, and the optical tags loaded into each service signal in the joint channel are the same.

[0146] In one feasible implementation, the extraction module 20 is further configured to:

[0147] The detection signal obtained from the sample signal by a photodetector;

[0148] The detection signal is sequentially amplified by transimpedance and converted from analog to digital to obtain the processing result, and the optical tag is extracted from the processing result.

[0149] The scheduling device for a space-division multiplexing optical fiber communication system provided in this application employs the scheduling method for a space-division multiplexing optical fiber communication system described in the above embodiments. This method can solve the technical problem of communication delay caused by the need for photoelectric-optical conversion of optical signals during the routing process in existing space-division multiplexing optical fiber communication systems. Compared with the prior art, the beneficial effects of the scheduling device for a space-division multiplexing optical fiber communication system provided in this application are the same as those of the scheduling method for a space-division multiplexing optical fiber communication system provided in the above embodiments. Furthermore, other technical features of the scheduling device for a space-division multiplexing optical fiber communication system are the same as those disclosed in the methods of the above embodiments, and will not be repeated here.

[0150] This application provides a scheduling device for a space division multiplexing optical fiber communication system. The scheduling device for the space division multiplexing optical fiber communication system includes: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to execute the scheduling method of the space division multiplexing optical fiber communication system in the above embodiment.

[0151] Referring now to Figure 12, a schematic diagram of a scheduling device suitable for implementing a space-division multiplexing optical fiber communication system according to embodiments of this application is shown. The scheduling device for the space-division multiplexing optical fiber communication system in embodiments of this application may include, but is not limited to, mobile terminals such as mobile phones, laptops, digital broadcast receivers, PDAs (Personal Digital Assistants), PADs (Portable Application Description), PMPs (Portable Media Players), vehicle terminals (e.g., vehicle navigation terminals), and fixed terminals such as digital TVs and desktop computers. The scheduling device for the space-division multiplexing optical fiber communication system shown in Figure 12 is merely an example and should not impose any limitations on the functionality and scope of use of the embodiments of this application.

[0152] As shown in Figure 12, the scheduling device of the space division multiplexing optical fiber communication system may include a processing unit 1001 (e.g., a central processing unit, a graphics processing unit, etc.), which can perform various appropriate actions and processes according to the program stored in the read-only memory (ROM) 1002 or the program loaded from the storage device 1003 into the random access memory (RAM) 1004. The RAM 1004 also stores various programs and data required for the operation of the scheduling device of the space division multiplexing optical fiber communication system. The processing unit 1001, ROM 1002, and RAM 1004 are interconnected via a bus 1005. An input / output (I / O) interface 1006 is also connected to the bus. Typically, the following systems can be connected to I / O interface 1006: input devices 1007 including, for example, touchscreens, touchpads, keyboards, mice, image sensors, microphones, accelerometers, gyroscopes, etc.; output devices 1008 including, for example, liquid crystal displays (LCDs), speakers, vibrators, etc.; storage devices 1003 including, for example, magnetic tapes, hard disks, etc.; and communication devices 1009. Communication device 1009 allows the scheduling equipment of the space-division multiplexing fiber optic communication system to exchange data with other devices wirelessly or via wired communication. Although the figure shows a scheduling equipment for a space-division multiplexing fiber optic communication system with various systems, it should be understood that it is not required to implement or possess all the systems shown. More or fewer systems can be implemented alternatively.

[0153] Specifically, according to the embodiments disclosed in this application, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, embodiments disclosed in this application include a computer program product comprising a computer program carried on a computer-readable storage medium, the computer program containing program code for performing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network via a communication device, or installed from storage device 1003, or installed from ROM 1002. When the computer program is executed by processing device 1001, it performs the functions defined in the methods of the embodiments disclosed in this application.

[0154] The scheduling device for a space-division multiplexing optical fiber communication system provided in this application employs the scheduling method for a space-division multiplexing optical fiber communication system described in the above embodiments, and can solve the technical problem of scheduling in a space-division multiplexing optical fiber communication system. Compared with the prior art, the beneficial effects of the scheduling device for a space-division multiplexing optical fiber communication system provided in this application are the same as the beneficial effects of the scheduling method for a space-division multiplexing optical fiber communication system provided in the above embodiments, and other technical features in the scheduling device for a space-division multiplexing optical fiber communication system are the same as those disclosed in the method of the previous embodiment, and will not be repeated here.

[0155] It should be understood that the various parts disclosed in this application can be implemented using hardware, software, firmware, or a combination thereof. In the description of the above embodiments, specific features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0156] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

[0157] This application provides a computer-readable storage medium having computer-readable program instructions (i.e., a computer program) stored thereon, the computer-readable program instructions being used to execute the scheduling method of the space division multiplexing optical fiber communication system in the above embodiments.

[0158] The computer-readable storage medium provided in this application may be, for example, a USB flash drive, but is not limited to, electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices, or any combination thereof. More specific examples of computer-readable storage media may include, but are not limited to: electrical connections having one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof. In this embodiment, the computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, system, or device. The program code contained on the computer-readable storage medium may be transmitted using any suitable medium, including but not limited to: wires, optical cables, RF (Radio Frequency), etc., or any suitable combination thereof.

[0159] The aforementioned computer-readable storage medium may be included in the scheduling equipment of the space division multiplexing optical fiber communication system; or it may exist independently and not be assembled into the scheduling equipment of the space division multiplexing optical fiber communication system.

[0160] The aforementioned computer-readable storage medium carries one or more programs, which, when executed by the scheduling device of the space-division multiplexing optical fiber communication system, enable the scheduling device of the space-division multiplexing optical fiber communication system to perform scheduling.

[0161] Computer program code for performing the operations of this application can be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, and C++, and conventional procedural programming languages ​​such as the "C" language or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving remote computers, the remote computer can be connected to the user's computer via any type of network—including a Local Area Network (LAN) or a Wide Area Network (WAN)—or can be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0162] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of this application. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.

[0163] The modules described in the embodiments of this application can be implemented in software or hardware. The names of the modules do not necessarily limit the functionality of the unit itself.

[0164] The readable medium provided in this application is a computer-readable storage medium that stores computer-readable program instructions (i.e., a computer program) for executing the scheduling method of the above-described space-division multiplexing optical fiber communication system, thereby solving the technical problem of scheduling in space-division multiplexing optical fiber communication systems. Compared with the prior art, the beneficial effects of the computer-readable storage medium provided in this application are the same as the beneficial effects of the scheduling method of the space-division multiplexing optical fiber communication system provided in the above embodiments, and will not be repeated here.

[0165] This application also provides a computer program product, including a computer program that, when executed by a processor, implements the steps of the scheduling method for a space-division multiplexing optical fiber communication system as described above.

[0166] The computer program product provided in this application can solve the technical problem of scheduling in space division multiplexing optical fiber communication systems. Compared with the prior art, the beneficial effects of the computer program product provided in this application are the same as the beneficial effects of the scheduling method for space division multiplexing optical fiber communication systems provided in the above embodiments, and will not be repeated here.

[0167] The above description is only a part of the embodiments of this application and does not limit the patent scope of this application. All equivalent structural transformations made under the technical concept of this application and using the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included in the patent protection scope of this application.

Claims

1. A scheduling method for a space-division multiplexing optical fiber communication system, wherein, An application to a space-division multiplexing optical fiber communication system, the space-division multiplexing optical fiber communication system including an optical add-drop multiplexer and an optical fiber link connected to the optical add-drop multiplexer, the method comprising the following steps: For any communication channel in the optical fiber link, before the service signal in the communication channel passes through the optical add-drop multiplexer, the service signal is split to obtain a sample signal and a new service signal. Extract the optical tag from the sample signal; The new service signal is scheduled based on the control path signal in the optical tag and the optical add-drop multiplexer.

2. The scheduling method for a space-division multiplexing optical fiber communication system as described in claim 1, wherein, After the step of extracting the optical tag from the sample signal, the method includes: Based on the actual carrier frequency signal in the optical tag, the signal status information of the signal passing through the optical add-drop multiplexer is monitored.

3. The scheduling method for a space-division multiplexing optical fiber communication system as described in claim 2, wherein, The signal status information includes at least one of optical power, optical signal-to-noise ratio, and crosstalk. The step of monitoring the signal status information of the signal passing through the optical add-drop multiplexer based on the actual carrier frequency signal in the optical tag includes: The sample power of the sample signal is calculated based on the actual carrier frequency signal in the optical tag, the light intensity of the channel where the optical tag is located, the preset modulation depth, and the control path signal in the optical tag; the optical power is calculated based on the sample power, the photodetector calibration coefficient during the optical tag extraction process, the preset modulation depth, and the splitting ratio during the splitting process; and / or The optical signal-to-noise ratio (SNR) is calculated based on the single-photon energy, the measurement bandwidth of the optical signal-to-noise ratio, the optical amplifier noise figure, and the optical power; and / or The actual carrier frequency signal is subjected to a fast Fourier transform to obtain the signal spectrum; if the signal spectrum has other peaks besides the preset target peak, the crosstalk is calculated based on the first amplitude of the standard carrier frequency signal corresponding to the target peak and the second amplitude of the carrier frequency signal corresponding to the other peaks.

4. The scheduling method for a space-division multiplexing optical fiber communication system as described in claim 2, wherein, After the step of determining the signal state information of the optical fiber link associated with the optical add-drop multiplexer based on the actual carrier frequency signal in the optical tag, the method includes: The monitoring information is obtained by associating the signal status information with the identification information of the optical add-drop multiplexer. The monitoring information is added to the optical tag of the signal passing through the optical add-drop multiplexer.

5. The scheduling method for a space-division multiplexing optical fiber communication system as described in claim 2, wherein, The space division multiplexing optical fiber communication system includes a service signal transmitting end, and the scheduling method of the space division multiplexing optical fiber communication system further includes: At the transmitting end, an optical tag consisting of a control path signal and a standard carrier frequency signal is loaded onto the service signal.

6. The scheduling method for a space-division multiplexing optical fiber communication system as described in claim 5, wherein, The transmitting end includes a tag loading unit, and the step of loading an optical tag composed of a control path signal and a standard carrier frequency signal onto the service signal at the transmitting end includes: For any communication channel in the space division multiplexing optical fiber communication system, the tag loading unit loads an optical tag into the service signal of the communication channel. The optical tag consists of a control path signal corresponding to the service signal and a standard carrier frequency signal corresponding to the service signal. In communication channels with a preset coupling relationship, the optical tags loaded into the service signals are the same. Alternatively, communication channels with a preset coupling relationship are combined into a joint channel, and the optical tags loaded into each service signal in the joint channel are the same.

7. The scheduling method for a space division multiplexing optical fiber communication system as described in any one of claims 1 to 6, wherein, The step of extracting the optical tag from the sample signal includes: The detection signal obtained from the sample signal by a photodetector; The detection signal is sequentially amplified by transimpedance and converted from analog to digital to obtain the processing result, and the optical tag is extracted from the processing result.

8. A scheduling device for a space division multiplexing optical fiber communication system, wherein, An apparatus for use in a space-division multiplexing optical fiber communication system, the space-division multiplexing optical fiber communication system including an optical add-drop multiplexer and an optical fiber link connected to the optical add-drop multiplexer, the apparatus comprising: The optical splitting module is used to split the service signal in any communication channel of the optical fiber link before the service signal in the communication channel passes through the optical add-drop multiplexer to obtain a sample signal and a new service signal. The extraction module is used to extract the optical tag from the sample signal; The scheduling module is used to schedule the new service signal based on the control path signal in the optical tag and the optical add-drop multiplexer.

9. A scheduling device for a space division multiplexing optical fiber communication system, wherein, The device includes: a memory, a processor, and a computer program stored in the memory and executable on the processor, the computer program being configured to implement the steps of the scheduling method for the space division multiplexing optical fiber communication system as described in any one of claims 1 to 7.

10. A medium, wherein, The medium is a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, it implements the steps of the scheduling method for the space division multiplexing optical fiber communication system as described in any one of claims 1 to 7.

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