Optical filter performance detection method, device, equipment, medium and program product

Abstract

The invention relates to an optical filter performance detection method, device and equipment, a medium and a program product. The method comprises the following steps: acquiring a top-adjusting signal in optical signals output by each optical filter in the wavelength division multiplexing system, the optical signals comprising a service optical signal and the top-adjusting signal superposed on the service optical signal, the wavelength division multiplexing system comprises a receiving end, a transmitting end and a plurality of wavelength channels located between the receiving end and the transmitting end and used for transmitting optical signals, and optical filters are arranged corresponding to different wavelength channels; determining the power of each top adjusting signal; and determining whether the performance of each optical filter is abnormal or not according to the power of each topping signal. By adopting the method, whether the performance of the optical filter is abnormal or not can be detected under the conditions of low cost and low complexity.

Description

Technical Field

[0001] The present application relates to the field of optical communication technology, and in particular to an optical filter performance detection method, device, equipment, medium and program product. Background Art

[0002] Optical filters are key components in wavelength division multiplexing (WDM) systems, and their performance has a significant impact on the overall transmission quality of the system. However, due to factors such as optical filter equipment aging and the influence of ambient temperature, the center frequency of the optical filter may shift or degrade, resulting in abnormal performance, thus affecting the normal operation of the WDM system.

[0003] In the related art, complex and expensive instruments such as spectrum analyzers are relied upon to detect whether the optical filter has performance abnormalities, but the detection cost and complexity of this method are high. Summary of the invention

[0004] Based on this, it is necessary to provide an optical filter performance detection method, device, equipment, medium and program product for detecting whether the optical filter performance is abnormal at low cost and low complexity in order to address the above technical problems.

[0005] In a first aspect, the present application provides a method for detecting performance of an optical filter. The method comprises:

[0006] A top-modulated signal is obtained from an optical signal output by each optical filter in a wavelength division multiplexing system, wherein the optical signal includes a service optical signal and the top-modulated signal superimposed on the service optical signal, wherein the wavelength division multiplexing system includes a receiving end, a transmitting end, and a plurality of wavelength channels for transmitting optical signals located between the receiving end and the transmitting end, and each optical filter is arranged corresponding to a different wavelength channel; the power of each top-modulated signal is determined; and according to the power of each top-modulated signal, whether the performance of each optical filter is abnormal is determined.

[0007] In one of the embodiments, determining whether each optical filter has abnormal performance according to the power of each top-modulated signal includes: determining whether each top-modulated signal satisfies a preset power change condition according to the power of each top-modulated signal; for each optical filter, if the top-modulated signal corresponding to the optical filter satisfies the preset power change condition, determining that the optical filter has abnormal performance; the abnormal performance includes a shift in the center frequency of the optical filter.

[0008] In one embodiment, determining whether each top-modulated signal satisfies a preset power change condition according to the power of each top-modulated signal includes: determining, for each top-modulated signal, a difference between the power of the top-modulated signal and a corresponding reference power; and determining that the top-modulated signal satisfies the preset power change condition if the difference corresponding to the top-modulated signal is within a preset power range.

[0009] In one embodiment, the modulation depth of the top modulation signal included in each optical signal is the same.

[0010] In one embodiment, determining the power of each top-modulated signal includes: for each top-modulated signal, sequentially performing Fourier transform and spectrum integration on the top-modulated signal to obtain the power of the top-modulated signal.

[0011] In one of the embodiments, the step of acquiring the top-modulated signal in the optical signal output by each optical filter in the wavelength division multiplexing system includes: using a preset type of photodetector to receive the top-modulated signal in the form of an optical signal transmitted by each wavelength channel to obtain each top-modulated signal in the form of an electrical signal output by the photodetector; and using an analog-to-digital converter to perform analog-to-digital conversion on each top-modulated signal in the form of an electrical signal to obtain each top-modulated signal in the form of a digital signal.

[0012] In a second aspect, the present application also provides an optical filter performance detection device. The device comprises:

[0013] A signal acquisition module, used for acquiring a top-modulated signal in an optical signal output by each optical filter in a wavelength division multiplexing system, wherein the optical signal includes a service optical signal and the top-modulated signal superimposed on the service optical signal, wherein the wavelength division multiplexing system includes a receiving end, a transmitting end, and a plurality of wavelength channels for transmitting optical signals located between the receiving end and the transmitting end, and each optical filter corresponds to a different wavelength channel;

[0014] A power determination module, used to determine the power of each top modulation signal;

[0015] The performance determination module is used to determine whether the performance of each optical filter is abnormal according to the power of each top modulation signal.

[0016] In one of the embodiments, the performance determination module is specifically used to: determine whether each top-modulated signal satisfies a preset power change condition according to the power of each top-modulated signal; for each optical filter, if the top-modulated signal corresponding to the optical filter satisfies the preset power change condition, determine that the performance of the optical filter is abnormal; the performance abnormality includes that the center frequency of the optical filter is offset.

[0017] In one embodiment, the performance determination module is specifically configured to: determine, for each top modulation signal, a difference between the power of the top modulation signal and a corresponding reference power; and determine that the top modulation signal satisfies the preset power change condition if the difference corresponding to the top modulation signal is within a preset power range.

[0018] In one embodiment, the modulation depth of the top modulation signal included in each optical signal is the same.

[0019] In one embodiment, the power determination module is specifically configured to: for each top-modulated signal, perform Fourier transform and spectrum integration on the top-modulated signal in sequence to obtain the power of the top-modulated signal.

[0020] In one of the embodiments, the signal acquisition module is specifically used to: use a preset type of photodetector to receive the top-modulated signal in the form of an optical signal transmitted by each wavelength channel to obtain each top-modulated signal in the form of an electrical signal output by the photodetector; use an analog-to-digital converter to perform analog-to-digital conversion on each top-modulated signal in the form of an electrical signal to obtain each top-modulated signal in the form of a digital signal.

[0021] In a third aspect, the present application further provides a computer device, including a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of any one of the methods described in the first aspect when executing the computer program.

[0022] In a fourth aspect, the present application further provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of any one of the methods described in the first aspect above.

[0023] In a fifth aspect, the present application further provides a computer program product, which includes a computer program, and when the computer program is executed by a processor, the steps of any one of the methods described in the first aspect are implemented.

[0024] The optical filter performance detection method, device, equipment, medium and program product described above obtain the top-modulated signal in the optical signal output by each optical filter in the wavelength division multiplexing system, the optical signal includes a service optical signal and the top-modulated signal superimposed on the service optical signal, the wavelength division multiplexing system includes a receiving end, a transmitting end and a plurality of wavelength channels for transmitting optical signals located between the receiving end and the transmitting end, and each optical filter is set corresponding to a different wavelength channel; determine the power of each top-modulated signal; and determine whether the performance of each optical filter is abnormal based on the power of each top-modulated signal. In this way, no other expensive devices are required, and only the power of the top-modulated signal needs to be analyzed to determine whether the optical filter is abnormal, and whether the performance of the optical filter is abnormal can be detected at low cost and low complexity. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 is a schematic flow chart of a method for detecting performance of an optical filter in one embodiment;

[0027] Figure 2 is a schematic diagram of signal power change in one embodiment;

[0028] Figure 3 A schematic diagram of a flow chart for determining whether an optical filter has abnormal performance in one embodiment;

[0029] Figure 4 A schematic diagram of a flow chart for determining whether a preset power change condition is met in one embodiment;

[0030] Figure 5 is a schematic diagram showing how the signal power difference varies with the center frequency offset of the optical filter in one embodiment;

[0031] Figure 6 A schematic diagram showing a comparison of center frequency offsets of multiple optical filters in one embodiment;

[0032] Figure 7 1 is a flow chart of a method for detecting optical filtering performance based on a top modulation signal in one embodiment;

[0033] Figure 8 is a structural block diagram of an optical filter performance detection device in one embodiment;

[0034] Fig. 9 FIG. 4 is a diagram showing the internal structure of a computer device in one embodiment. DETAILED DESCRIPTION

[0035] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. It should be understood that many specific details are set forth in the following description to facilitate a full understanding of the present application, but the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0037] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0038] It is understood that the terms "first", "second", etc. used in this application may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish a first element from another element. For example, without departing from the scope of this application, a first resistor may be referred to as a second resistor, and similarly, a second resistor may be referred to as a first resistor. Both the first resistor and the second resistor are resistors, but they are not the same resistor.

[0039] It can be understood that the “connection” in the following embodiments should be understood as “electrical connection”, “communication connection”, etc. if the connected circuits, modules, units, etc. have electrical signals or data transmission between each other.

[0040] It can be understood that “at least one” means one or more, “plurality” means two or more, and “at least part of an element” means part or all of an element.

[0041] When used herein, the singular forms "a", "an", and "said / the" may also include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" and the like specify the presence of stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof. At the same time, the term "and / or" used in this specification includes any and all combinations of the relevant listed items.

[0042] In modern optical communication systems, wavelength division multiplexing (WDM) technology is widely used to improve the capacity and efficiency of optical fiber transmission. Optical filters are key components in WDM systems, and their performance has a significant impact on the overall transmission quality of the system.

[0043] As the equipment ages and the ambient temperature changes, the center frequency of the optical filter may shift or deteriorate, thus affecting the normal operation of the system. Traditional monitoring methods usually rely on complex and expensive instruments such as spectrum analyzers, which increases the cost and complexity of monitoring. Therefore, it is of great practical significance to propose a simple and efficient method for monitoring the performance of optical filters.

[0044] In view of this, an embodiment of the present application provides a method for detecting the performance of an optical filter, which can detect whether the performance of the optical filter is abnormal in a simple and low-cost manner.

[0045] It should be noted that the optical filter performance detection method provided in the embodiment of the present application may be executed by an optical filter performance detection device, which may be implemented by software, hardware, or a combination of software and hardware and integrated in the receiving end of the wavelength division multiplexing system or in a separate test end. The following takes the method applied to the receiving end or the test end as an example.

[0046] In one embodiment, Figure 1 As shown, a method for detecting performance of an optical filter is provided, comprising the following steps:

[0047] Step 101, obtaining a top modulation signal in an optical signal output by each optical filter in a wavelength division multiplexing system; the optical signal includes a service optical signal and a top modulation signal superimposed on the service optical signal.

[0048] The wavelength division multiplexing system includes a receiving end, a transmitting end and a plurality of wavelength channels for transmitting optical signals between the receiving end and the transmitting end, and each optical filter is arranged corresponding to a different wavelength channel.

[0049] A wavelength division multiplexing system is a system that uses wavelength division multiplexing technology to simultaneously transmit multiple optical signals of different wavelengths in a single optical fiber. An optical filter can be set at the receiving end or at the transmitting end, or of course, at both the receiving end and the transmitting end. The method provided in the embodiment of the present application can detect optical filters set at both the transmitting end and the receiving end.

[0050] Exemplarily, at the transmitting end of a WDM system, an optical filter, as part of a combiner, is responsible for combining optical signals of different wavelengths into a composite optical signal. This is achieved by precisely controlling and selecting thin-film filters in a specific wavelength range, so that the system can accurately couple signals of different wavelengths into the same optical fiber for transmission. Optical filters also play a role in optimizing signal quality at the transmitting end. For example, gain flattening filters can be used in erbium-doped fiber amplifiers to flatten the gain spectrum, thereby ensuring that each wavelength of the signal has a uniform power level before transmission, thereby optimizing the overall signal transmission quality. At the receiving end of the WDM system, the optical filter acts as a splitter, responsible for separating the composite optical signal that has been transmitted over a long distance into the original optical signals of different wavelengths. This separation ensures that each receiver can receive the signal of the corresponding wavelength for further processing and analysis. This mechanism improves the accuracy of signal recognition at the receiving end, reduces interference between signals, and improves the accuracy and reliability of data transmission.

[0051] In a wavelength division multiplexing system, the optical signal output by the transmitting end is transmitted to the receiving end through the wavelength channel in the optical fiber. It can be understood that for the optical filter set at the transmitting end, the optical signal will be processed by the optical filter and then transmitted through the optical fiber, that is, the optical signal output by the optical filter is transmitted to the receiving end. For the optical filter set at the transmitting end, after the optical signal is transmitted from the optical fiber to the receiving end, it is separated after being processed by the optical filter, that is, the optical signal output by the optical filter is each optical signal of different wavelengths after separation. Therefore, in the embodiment of the present application, no matter whether the optical filter is set at the transmitting end or the receiving end, the optical signal output by each optical filter in the wavelength division multiplexing system can be obtained, and then the top modulation signal in the optical signal can be obtained.

[0052] As mentioned above, this method can be applied to the receiving end. Therefore, it can be understood that when the optical signal is transmitted to the receiving end, the receiving end can directly obtain the optical signals of each wavelength output by the optical filter.

[0053] Optionally, the method can also be applied to the test end. In this case, when the signal of the transmitting end is detected, the test end can obtain the optical signal transmitted by the optical fiber before it is processed by the optical filter of the receiving end, and further obtain the top modulation signal in the optical signal, thereby avoiding the situation where the optical filter of the receiving end also has an abnormality, which affects the abnormal detection of the optical filter of the transmitting end.

[0054] In a wavelength division multiplexing system, optical filters are provided corresponding to different wavelength channels, and the optical signals processed by each optical filter are transmitted in the corresponding wavelength channel.

[0055] Optionally, all optical filters at the transmitting end may be tested simultaneously to see if they are abnormal, or all optical filters at the receiving end may be tested simultaneously to see if they are abnormal.

[0056] Optionally, it is possible to simultaneously test whether the optical filter of the transmitting end part is abnormal or simultaneously test whether the optical filter of the receiving end part is abnormal.

[0057] The optical signal includes a service optical signal and a top modulation signal superimposed on the service optical signal. The service optical signal refers to an optical signal used to transmit data and information in a specific service or application. That is, the service optical signal in the embodiment of the present application refers to an optical signal carrying data and signals. The top modulation technology is to superimpose a small amplitude modulation signal on the service optical signal of each wavelength at the transmitting end. When this modulation signal is superimposed on the optical wavelength, there will be a modulation amplitude on the top of the optical wavelength, so it is called a top modulation signal. Based on this, it can be understood that the optical filter is mainly used to process the service optical signal.

[0058] Since the top modulation signal in each optical signal is processed and transmitted simultaneously with the service optical signal, if the optical filter is abnormal, it will cause the service optical signal to be abnormal, and will also cause the top modulation signal to be abnormal. Therefore, by obtaining the top modulation signal in the optical signal, it is determined whether the optical filter of the corresponding wavelength channel is abnormal based on the top modulation signal.

[0059] Step 102: determine the power of each top modulation signal.

[0060] During the transmission process, if the optical filter has performance abnormalities such as frequency offset, the intensity of the top modulation signal and the service optical signal transmitted after being processed by the optical filter will change, for example, the power of the top modulation signal will be weakened. Figure 2 A schematic diagram showing a signal power change.

[0061] Therefore, the power of each top modulation signal in each optical signal can be determined, based on which it is determined whether the optical filter corresponding to the wavelength channel transmitting the optical signal is abnormal.

[0062] Step 103: Determine whether the performance of each optical filter is abnormal according to the power of each top modulation signal.

[0063] Exemplarily, by judging whether the power of the top modulation signal is significantly different from the expected value, it is determined whether the corresponding optical filter has abnormal performance.

[0064] The optical filter performance detection method described above obtains the top-modulated signal in the optical signal output by each optical filter in the wavelength division multiplexing system, the optical signal includes a service optical signal and the top-modulated signal superimposed on the service optical signal, the wavelength division multiplexing system includes a receiving end, a transmitting end and a plurality of wavelength channels for transmitting optical signals located between the receiving end and the transmitting end, and each optical filter is set corresponding to a different wavelength channel; determines the power of each top-modulated signal; and determines whether the performance of each optical filter is abnormal based on the power of each top-modulated signal. In this way, no other expensive devices are required, and only the power of the top-modulated signal needs to be analyzed to determine whether the optical filter is abnormal, and whether the performance of the optical filter is abnormal can be detected at low cost and low complexity.

[0065] In one embodiment, Figure 3 FIG. 1 is a flow chart showing a method for determining whether an optical filter has abnormal performance. Determining whether each optical filter has abnormal performance according to the power of each top modulation signal includes:

[0066] Step 301: Determine whether each top modulation signal satisfies a preset power change condition according to the power of each top modulation signal.

[0067] In the embodiment of the present application, a preset power change condition is preset, and based on the preset power change condition, it can be effectively determined whether the power of the top modulation signal is abnormal.

[0068] In an optional implementation, Figure 4 FIG. 1 shows a flow chart of determining whether a preset power change condition is met. Determining whether each top modulation signal meets the preset power change condition according to the power of each top modulation signal includes:

[0069] Step 401: for each top-modulated signal, determine the difference between the power of the top-modulated signal and the corresponding reference power.

[0070] Optionally, different reference powers are set correspondingly according to the performance of each optical filter. The difference is calculated by subtracting the power of the top modulation signal in the optical signal output by each optical filter from the corresponding reference power.

[0071] Optionally, the same reference power is set, and the power of the top modulation signal output by any optical filter is subtracted from the reference power.

[0072] Optionally, the reference power may be set to the power before the top modulation signal is transmitted.

[0073] Step 402: If the difference corresponding to the top modulation signal is within a preset power range, it is determined that the top modulation signal satisfies a preset power change condition.

[0074] Exemplarily, the performance anomaly includes a shift in the center frequency of the optical filter. Figure 5As shown in Figure 1, the difference in the power of the top modulation signal will change significantly with the center frequency offset of the optical filter. Figure 6 As shown, in the case where there are optical filters corresponding to multiple wavelength channels, the trend that the difference in the top-modulated signal power changes with the center frequency offset of the optical filter is not affected. Therefore, in the embodiment of the present application, it is possible to determine whether the center frequency of the corresponding optical filter is offset based on the power of the top-modulated signal in the wavelength division multiplexing system, thereby determining whether there is a performance abnormality.

[0075] The difference corresponding to the top modulation signal being within the preset power range may mean being equal to the preset difference, or being within a smaller range from the preset difference.

[0076] In this way, only by setting the reference power, it is possible to quickly and accurately determine whether there is a phenomenon of center frequency deviation of the optical filter, thereby ensuring the efficiency of the optical filter performance abnormality detection process.

[0077] In another optional implementation, determining whether each top-modulated signal satisfies a preset power change condition according to the power of each top-modulated signal includes: for each top-modulated signal, determining a difference between the power of the top-modulated signal and a corresponding reference power. If a distribution rule of the difference corresponding to each top-modulated signal satisfies a preset rule, it is determined that the preset power change condition is satisfied.

[0078] Among them, each optical filter constitutes a filtering network, and the center frequency offset of each optical filter is simultaneously affected by factors such as the environment. There is a situation where each optical filter is offset at the same time. The preset rule refers to the power difference distribution rule of the top modulation signal processed by each optical filter under the same environment that is predetermined.

[0079] If the distribution rule of the difference values ​​corresponding to each top modulation signal conforms to the preset rule, it means that each optical filter has a center frequency offset.

[0080] Step 302: For each optical filter, if the top modulation signal corresponding to the optical filter meets the preset power change condition, it is determined that the optical filter has abnormal performance. The abnormal performance includes that the center frequency of the optical filter is offset.

[0081] In other words, if the top modulation signal corresponding to the optical filter meets the preset power variation condition, it is determined that the center frequency of the optical filter corresponding to the top modulation signal meeting the preset power variation condition is shifted.

[0082] Optional, can be based on Figure 5 This type of correspondence is exemplified to determine the center frequency offset of the optical filter.

[0083] In the embodiment of the present application, the center frequency drift of the optical filter can be monitored without using complex instruments such as spectrum analyzers. Through this method, the monitoring cost and complexity can be reduced, and the real-time monitoring of the optical filter performance can be achieved to ensure the stable operation of the optical communication system.

[0084] In one embodiment, the modulation depths of the top modulation signals included in each optical signal are the same.

[0085] That is, a modulation top signal with the same modulation depth is loaded on each service optical signal, so as to facilitate subsequent determination of which optical filter has an abnormality.

[0086] Optionally, the modulation signal may be a sine modulation signal or a cosine modulation signal.

[0087] Optionally, the frequencies of the top modulation signals are different.

[0088] In one embodiment, obtaining a top-modulated signal in an optical signal output by each optical filter in a wavelength division multiplexing system includes: using a preset type of photodetector to receive the top-modulated signal in the form of an optical signal transmitted by each wavelength channel to obtain each top-modulated signal in the form of an electrical signal output by the photodetector; and using an analog-to-digital converter to perform analog-to-digital conversion on each top-modulated signal in the form of an electrical signal to obtain each top-modulated signal in the form of a digital signal.

[0089] The receiving end of the wavelength division multiplexing system may be provided with a photoelectric detector and an analog-to-digital converter of a preset type.

[0090] Each top modulation signal in the form of an electrical signal can be converted by using a preset type of photoelectric detector, and then analog-to-digital conversion can be performed, so that the power of each top modulation signal in the form of a digital signal can be calculated later.

[0091] Among them, since the frequency of the modulation signal is low, a low-speed photodetector (PD) and an analog-to-digital converter (ADC) can meet the detection requirements. Therefore, the preset type of photodetector can refer to a low-speed photodetector.

[0092] In one embodiment, determining the power of each top-modulated signal includes: for each top-modulated signal, sequentially performing Fourier transform and spectrum integration on the top-modulated signal to obtain the power of the top-modulated signal.

[0093] That is, the top-modulated signal in the form of a digital signal is first subjected to Fourier transform (which may be a fast Fourier transform FFT), and then subjected to integral transform, so as to extract the power of the top-modulated signal.

[0094] For ease of understanding, the optical filtering performance detection method based on the top modulation signal provided in the embodiment of the present application is described below with a complete embodiment.

[0095] This method can monitor the drift of the optical filter center wavelength without using complex instruments such as spectrum analyzers. Figure 7 As shown, the method includes: ① loading of top modulation signal; ② transmission of top modulation signal; ③ frequency deviation influence of optical filter; ④ reception of top modulation signal; ⑤ signal processing; and ⑥ power analysis.

[0096] 1. Loading of top adjustment signal:

[0097] In a WDM system, a top modulation signal with the same modulation depth is loaded on the service optical signal of each wavelength. Optionally, the top modulation signal can be modulated by a simple sine wave to facilitate subsequent detection and processing.

[0098] 2. Transmission of top modulation signal:

[0099] The top modulation signal is transmitted together with the service optical signal. Since the top modulation signal and the service optical signal are transmitted simultaneously, the performance change of the optical filter can be reflected in real time.

[0100] 3. Impact of optical filters:

[0101] During the transmission process, if there is frequency drift in the optical filter, the intensity of the top modulation signal and the service optical signal passing through the filter will change, which is specifically manifested as a weakening of the intensity of the top modulation signal.

[0102] 4. Receiving the top adjustment signal:

[0103] At the test end, a low-speed photodetector (PD) and analog-to-digital converter (ADC) are used to receive the top modulation signal. Since the frequency of the top modulation signal is low, the low-speed PD and ADC can meet the detection requirements.

[0104] 5. Signal processing:

[0105] The received top-modulated signal is subjected to digital signal processing such as fast Fourier transform (FFT) and integration to extract the power of the top-modulated signal of each wavelength channel.

[0106] 6. Power analysis:

[0107] The power of the top modulation signal is proportional to the intensity of the optical signal. Therefore, by analyzing the top modulation signal power of each wavelength channel, the performance change of the optical filter can be determined.

[0108] Exemplarily, in one embodiment, the effectiveness of the method is verified using VPIphotonics 9.9 optical simulation software. In a 10-wavelength channel WDM system, the optical wave frequency of the first wavelength channel is 193.1 THz, and the wavelength interval is 50 GHz. The service optical signal of each channel is loaded with a top modulation signal with a frequency of 40 MHz + n*0.5 MHz (n is the channel number) and a modulation depth of 10%.

[0109] During the transmission process, the optical filter of each channel is set to have different degrees of frequency drift, which causes the top-modulated signal strength of the channel to weaken. At the receiving end, a low-speed photodetector (PD) and an analog-to-digital converter (ADC) are used to receive the top-modulated signal and perform digital signal processing. The received top-modulated signal is subjected to a fast Fourier transform (FFT) and the corresponding frequency band of the wavelength channel is integrated to obtain the top-modulated signal power of each wavelength channel. Figure 6 It is shown that the power of the top modulation signal of different wavelength channels will change with the filter offset, and the change is obvious. In the case of multiple wavelength channels, the power difference change trend is not affected. Therefore, this solution can be applied in WDM systems.

[0110] In this method, in the WDM system, a top modulation signal is loaded on the service optical signal of each wavelength, and the top modulation signal is transmitted together with the service optical signal. When the frequency of the optical filter drifts, it will cause the power of the top modulation signal to change. By analyzing the power change law of the top modulation signal of the multi-wavelength channel, the frequency drift of the optical filter can be monitored in real time, and then the filtering performance of the optical wavelength channel can be evaluated. Therefore, the monitoring of the center frequency drift of the optical filter can be realized without using complex instruments such as optical spectrum analyzers. Through this method, the monitoring cost and complexity can be reduced, and the real-time monitoring of the performance of the optical filter can be realized to ensure the stable operation of the optical communication system.

[0111] It should be understood that, although the steps in the flowcharts involved in the above embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps is not strictly limited in order, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above embodiments may include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0112] Based on the same inventive concept, the embodiment of the present application also provides an optical filter performance detection device for implementing the optical filter performance detection method involved above. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the above method, so the specific limitations in one or more optical filter performance detection device embodiments provided below can refer to the limitations of the optical filter performance detection method above, and will not be repeated here.

[0113] In one embodiment, Figure 8 As shown, an optical filter performance detection device is provided, and the optical filter performance detection device 800 includes: a signal acquisition module 801, a power determination module 802 and a performance determination module 803, wherein:

[0114] The signal acquisition module 801 is used to acquire a top-modulated signal in an optical signal output by each optical filter in a wavelength division multiplexing system, where the optical signal includes a service optical signal and a top-modulated signal superimposed on the service optical signal. The wavelength division multiplexing system includes a receiving end, a transmitting end, and a plurality of wavelength channels for transmitting optical signals between the receiving end and the transmitting end, and each optical filter corresponds to a different wavelength channel.

[0115] A power determination module 802, configured to determine the power of each top modulation signal;

[0116] The performance determination module 803 is used to determine whether the performance of each optical filter is abnormal according to the power of each top modulation signal.

[0117] In one embodiment, the performance determination module 803 is specifically used to: determine whether each top-modulated signal satisfies a preset power change condition according to the power of each top-modulated signal; for each optical filter, if the top-modulated signal corresponding to the optical filter satisfies the preset power change condition, determine that the performance of the optical filter is abnormal; and the performance abnormality includes that the center frequency of the optical filter is offset.

[0118] In one embodiment, the performance determination module 803 is specifically configured to: determine, for each top modulation signal, a difference between the power of the top modulation signal and a corresponding reference power; and if the difference corresponding to the top modulation signal is within a preset power range, determine that the top modulation signal satisfies the preset power change condition.

[0119] In one embodiment, the modulation depth of the top modulation signal included in each optical signal is the same.

[0120] In one embodiment, the power determination module 802 is specifically configured to: for each top-modulated signal, perform Fourier transform and spectrum integration on the top-modulated signal in sequence to obtain the power of the top-modulated signal.

[0121] In one embodiment, the signal acquisition module 801 is specifically used to: use a preset type of photodetector to receive the top-modulated signal in the form of an optical signal transmitted by each wavelength channel to obtain each top-modulated signal in the form of an electrical signal output by the photodetector; use an analog-to-digital converter to perform analog-to-digital conversion on each top-modulated signal in the form of an electrical signal to obtain each top-modulated signal in the form of a digital signal.

[0122] Each module in the above optical filter performance detection device can be implemented in whole or in part by software, hardware or a combination thereof. Each module can be embedded in or independent of a processor in a computer device in the form of hardware, or can be stored in a memory in a computer device in the form of software, so that the processor can call and execute operations corresponding to each module.

[0123] In one embodiment, a computer device is provided. The computer device may be a server, and its internal structure diagram may be as follows: Fig. 9 As shown. The computer device includes a processor, a memory, an input / output interface (Input / Output, referred to as I / O) and a communication interface. The processor, the memory and the input / output interface are connected through a system bus, and the communication interface is connected to the system bus through the input / output interface. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store optical filter performance detection data. The input / output interface of the computer device is used to exchange information between the processor and an external device. The communication interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, a method for detecting the performance of an optical filter is implemented.

[0124] Those skilled in the art will understand that Fig. 9 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0125] In one embodiment, a computer device is provided, including a memory and a processor, wherein a computer program is stored in the memory, and when the processor executes the computer program, the following steps are implemented:

[0126] Acquire a top modulation signal in an optical signal output by each optical filter in a wavelength division multiplexing system, wherein the optical signal includes a service optical signal and a top modulation signal superimposed on the service optical signal, wherein the wavelength division multiplexing system includes a receiving end, a transmitting end, and a plurality of wavelength channels for transmitting optical signals located between the receiving end and the transmitting end, and each optical filter is arranged corresponding to a different wavelength channel;

[0127] Determine the power of each top modulation signal;

[0128] According to the power of each top modulation signal, it is determined whether the performance of each optical filter is abnormal.

[0129] In one embodiment, when the processor executes the computer program, the processor further implements the following steps:

[0130] Determining whether each top modulation signal satisfies a preset power change condition according to the power of each top modulation signal;

[0131] For each optical filter, if the top modulation signal corresponding to the optical filter meets the preset power change condition, it is determined that the performance of the optical filter is abnormal; the performance abnormality includes that the center frequency of the optical filter is offset.

[0132] In one embodiment, when the processor executes the computer program, the processor further implements the following steps:

[0133] For each top-modulated signal, determining a difference between the power of the top-modulated signal and a corresponding reference power;

[0134] If the difference corresponding to the top modulation signal is within the preset power range, it is determined that the top modulation signal meets the preset power change condition.

[0135] In one embodiment, the modulation depths of the top modulation signals included in each optical signal are the same.

[0136] In one embodiment, when the processor executes the computer program, the processor further implements the following steps:

[0137] For each top-modulated signal, Fourier transform and spectrum integration are performed on the top-modulated signal in sequence to obtain the power of the top-modulated signal.

[0138] In one embodiment, when the processor executes the computer program, the processor further implements the following steps:

[0139] Using a preset type of photoelectric detector to receive the top modulation signal in the form of an optical signal transmitted by each wavelength channel, and obtaining each top modulation signal in the form of an electrical signal output by the photoelectric detector;

[0140] The analog-to-digital converter is used to perform analog-to-digital conversion on each top modulation signal in the form of an electrical signal to obtain each top modulation signal in the form of a digital signal.

[0141] In one embodiment, a computer readable storage medium is provided, on which a computer program is stored, and when the computer program is executed by a processor, the following steps are implemented:

[0142] Acquire a top modulation signal in an optical signal output by each optical filter in a wavelength division multiplexing system, wherein the optical signal includes a service optical signal and a top modulation signal superimposed on the service optical signal, wherein the wavelength division multiplexing system includes a receiving end, a transmitting end, and a plurality of wavelength channels for transmitting optical signals located between the receiving end and the transmitting end, and each optical filter is arranged corresponding to a different wavelength channel;

[0143] Determine the power of each top modulation signal;

[0144] According to the power of each top modulation signal, it is determined whether the performance of each optical filter is abnormal.

[0145] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0146] Determining whether each top modulation signal satisfies a preset power change condition according to the power of each top modulation signal;

[0147] For each optical filter, if the top modulation signal corresponding to the optical filter meets the preset power change condition, it is determined that the performance of the optical filter is abnormal; the performance abnormality includes that the center frequency of the optical filter is offset.

[0148] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0149] For each top-modulated signal, determining a difference between the power of the top-modulated signal and a corresponding reference power;

[0150] If the difference corresponding to the top modulation signal is within the preset power range, it is determined that the top modulation signal meets the preset power change condition.

[0151] In one embodiment, the modulation depths of the top modulation signals included in each optical signal are the same.

[0152] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0153] For each top-modulated signal, Fourier transform and spectrum integration are performed on the top-modulated signal in sequence to obtain the power of the top-modulated signal.

[0154] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0155] Using a preset type of photoelectric detector to receive the top modulation signal in the form of an optical signal transmitted by each wavelength channel, and obtaining each top modulation signal in the form of an electrical signal output by the photoelectric detector;

[0156] The analog-to-digital converter is used to perform analog-to-digital conversion on each top modulation signal in the form of an electrical signal to obtain each top modulation signal in the form of a digital signal.

[0157] In one embodiment, a computer program product is provided, comprising a computer program, which, when executed by a processor, implements the following steps:

[0158] Acquire a top modulation signal in an optical signal output by each optical filter in a wavelength division multiplexing system, wherein the optical signal includes a service optical signal and a top modulation signal superimposed on the service optical signal, wherein the wavelength division multiplexing system includes a receiving end, a transmitting end, and a plurality of wavelength channels for transmitting optical signals located between the receiving end and the transmitting end, and each optical filter is arranged corresponding to a different wavelength channel;

[0159] Determine the power of each top modulation signal;

[0160] According to the power of each top modulation signal, it is determined whether the performance of each optical filter is abnormal.

[0161] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0162] Determining whether each top modulation signal satisfies a preset power change condition according to the power of each top modulation signal;

[0163] For each optical filter, if the top modulation signal corresponding to the optical filter meets the preset power change condition, it is determined that the performance of the optical filter is abnormal; the performance abnormality includes that the center frequency of the optical filter is offset.

[0164] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0165] For each top-modulated signal, determining a difference between the power of the top-modulated signal and a corresponding reference power;

[0166] If the difference corresponding to the top modulation signal is within the preset power range, it is determined that the top modulation signal meets the preset power change condition.

[0167] In one embodiment, the modulation depths of the top modulation signals included in each optical signal are the same.

[0168] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0169] For each top-modulated signal, Fourier transform and spectrum integration are performed on the top-modulated signal in sequence to obtain the power of the top-modulated signal.

[0170] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0171] Using a preset type of photoelectric detector to receive the top modulation signal in the form of an optical signal transmitted by each wavelength channel, and obtaining each top modulation signal in the form of an electrical signal output by the photoelectric detector;

[0172] The analog-to-digital converter is used to perform analog-to-digital conversion on each top modulation signal in the form of an electrical signal to obtain each top modulation signal in the form of a digital signal.

[0173] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited to this. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but are not limited to this.

[0174] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0175] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A method for detecting optical filter performance, characterized in that: The method comprises: Acquire a top-modulated signal in an optical signal output by each optical filter in a wavelength division multiplexing system, wherein the optical signal includes a service optical signal and the top-modulated signal superimposed on the service optical signal, wherein the wavelength division multiplexing system includes a receiving end, a transmitting end, and a plurality of wavelength channels for transmitting optical signals located between the receiving end and the transmitting end, and each of the optical filters is arranged corresponding to a different wavelength channel; Determining the power of each of the top modulation signals; Whether the performance of each optical filter is abnormal is determined according to the power of each top modulation signal.

2. The method according to claim 1, characterized in that The step of determining whether the performance of each optical filter is abnormal according to the power of each top modulation signal includes: Determining whether each of the top modulation signals satisfies a preset power change condition according to the power of each of the top modulation signals; For each of the optical filters, if the top modulation signal corresponding to the optical filter satisfies the preset power change condition, it is determined that the performance of the optical filter is abnormal; the performance abnormality includes that the center frequency of the optical filter is offset.

3. The method according to claim 2, characterized in that The determining, according to the power of each of the top modulation signals, whether each of the top modulation signals satisfies a preset power change condition includes: For each of the top modulation signals, determining a difference between the power of the top modulation signal and a corresponding reference power; If the difference corresponding to the top modulation signal is within the preset power range, it is determined that the top modulation signal satisfies the preset power change condition.

4. The method according to claim 1, characterized in that: The modulation depths of the top modulation signals included in the optical signals are the same.

5. The method according to any one of claims 1 to 4, characterized in that: The determining the power of each of the top modulation signals comprises: For each of the top-modulated signals, Fourier transform and spectrum integration are performed on the top-modulated signals in sequence to obtain the power of the top-modulated signals.

6. The method according to any one of claims 1 to 4, characterized in that: The step of obtaining the top modulation signal in the optical signal output by each optical filter in the wavelength division multiplexing system comprises: Using a preset type of photoelectric detector to receive the top-modulated signal in the form of an optical signal transmitted by each wavelength channel, and obtaining each top-modulated signal in the form of an electrical signal output by the photoelectric detector; The analog-to-digital converter is used to perform analog-to-digital conversion on each of the top-modulated signals in the form of electrical signals to obtain each of the top-modulated signals in the form of digital signals.

7. An optical filter performance detection device, characterized in that: The device comprises: A signal acquisition module, used for acquiring a top-modulated signal in an optical signal output by each optical filter in a wavelength division multiplexing system, wherein the optical signal includes a service optical signal and the top-modulated signal superimposed on the service optical signal, wherein the wavelength division multiplexing system includes a receiving end, a transmitting end, and a plurality of wavelength channels for transmitting optical signals located between the receiving end and the transmitting end, and each of the optical filters corresponds to a different wavelength channel; A power determination module, used to determine the power of each of the top modulation signals; The performance determination module is used to determine whether the performance of each optical filter is abnormal according to the power of each top modulation signal.

8. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 6 are implemented.

9. A storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.

10. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.

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