Optical filtering device, optical filtering system and filtering method

Abstract

The application discloses an optical filtering device, an optical filtering system and a filtering method, and belongs to the technical field of optical communication. The optical filtering device comprises a first control element and a spatial light modulation element. The first control element is configured with multiple parameters, and different parameters indicate different filter profiles. The first control element is used for acquiring a first parameter corresponding to the signal light in the multiple parameters and controlling the spatial light modulation element according to the first parameter. Correspondingly, the spatial light modulation element is used for filtering the signal light according to the first filter profile indicated by the first parameter. Since the first control element is configured with multiple parameters, different parameters in the multiple parameters indicate different filter profiles, and multiple filter profiles coexist. The first control element can quickly and accurately determine the filter profile suitable for filtering the signal light from the multiple filter profiles, which is beneficial to reducing the filtering cost, improving the communication performance, ensuring the efficiency of determining the filter profile and the efficiency of filtering.

Description

Technical Field

[0001] This application relates to the field of optical communication technology, and in particular to optical filtering devices, optical filtering systems and filtering methods. Background Technology

[0002] With the development of optical communication technology, optical transmission networks that achieve communication by transmitting signal light carrying service information are becoming increasingly common, with wavelength division multiplexing (WDM) networks being one such example. WDM networks include optical filtering devices, which can filter signal light according to a specific filtering spectrum. The filtering spectrum affects the filtering cost, which in turn affects communication performance. Therefore, it is necessary to filter the signal light according to an appropriate filtering spectrum.

[0003] In related technologies, an optical frequency domain equalizer is installed connected to the optical filter. The optical filter filters the signal light according to a fixed filter spectrum, obtaining and outputting the filtered signal light. The optical frequency domain equalizer then performs frequency domain shaping on the filtered signal light to reduce the filtering cost.

[0004] However, the related technologies require the installation of optical frequency domain equalizers, which increases costs and insertion loss, thus limiting their application. Summary of the Invention

[0005] This application provides an optical filtering device, an optical filtering system, and a filtering method to solve the problems existing in related technologies. The technical solution provided by this application includes the following aspects.

[0006] In a first aspect, an optical filtering device is provided, comprising a first control element and a spatial light modulation element. The first control element is configured with multiple parameters, different parameters indicating different filtering spectra. Specifically, the first control element is used to acquire a first parameter corresponding to the signal light among the multiple parameters, and controls the spatial light modulation element according to the first parameter. Correspondingly, the spatial light modulation element is used to filter the signal light according to the first filtering spectra indicated by the first parameter.

[0007] In this application, since the first control element is configured with multiple parameters, and different parameters indicate different filtering spectra, multiple filtering spectra coexist. Therefore, the first control element can quickly and accurately determine the filtering spectra suitable for filtering the signal light from among these multiple spectra, which helps reduce filtering costs and improve communication performance, while also ensuring the efficiency of determining the filtering spectra. Furthermore, compared to related technologies, this application does not require an additional optical frequency domain equalizer, avoiding both increased costs and insertion losses introduced by an additional optical frequency domain equalizer, thus possessing strong practicality and flexibility.

[0008] In one possible implementation, the first filter spectrum is matched with the characteristic information of the signal light, the characteristic information indicating at least one of the physical characteristics and scene characteristics of the signal light, the physical characteristics of the signal light including at least one of the channel spacing, center frequency, baud rate or modulation format of the signal light, and the scene characteristics indicating whether the filtered signal light is rerouted.

[0009] Since different signal light characteristics may lead to different filtering spectra, the first filtering spectra are used to filter the signal light. By matching the first filtering spectra with the signal light characteristics, the accuracy of the first filtering spectra is ensured. Filtering the signal light according to the first filtering spectra helps to further reduce the filtering cost. This application allows for flexible selection of one or more types of information as physical characteristics of the signal light according to actual needs, offering considerable flexibility.

[0010] In one possible implementation, a first control element is used to receive feature information sent by a monitoring element, and to determine the parameter corresponding to the feature information from among multiple parameters as a first parameter, so that the first filter spectrum indicated by the first parameter matches the feature information.

[0011] In other words, the first control element acquires the characteristic information of the signal light by receiving the characteristic information sent by the monitoring element. This implementation method is simple, easy to implement, and highly practical.

[0012] In one possible implementation, a first control element is configured to receive a first instruction for the signal light sent by a second control element, and determine the parameter corresponding to the first instruction from among a plurality of parameters as a first parameter.

[0013] In this implementation, the first control element quickly and accurately determines the first parameter corresponding to the signal light from multiple parameters based on the received first instruction, thereby improving the determination efficiency of the filter spectrum and the corresponding filtering efficiency.

[0014] In one possible implementation, the first control element is further configured to acquire a second parameter corresponding to the signal light when the filtering cost is greater than or equal to a cost threshold. The second parameter is different from the first parameter, and the filtering cost is the cost of filtering the signal light according to a first filtering spectrum. The first control element is further configured to control a spatial light modulation element according to the second parameter. The spatial light modulation element is further configured to filter the signal light according to a second filtering spectrum indicated by the second parameter, the second filtering spectrum being different from the first filtering spectrum.

[0015] If the filtering cost is greater than or equal to the cost threshold, it indicates that there is still room to reduce the filtering cost based on the first filtering spectrum. A more suitable filtering spectrum for filtering the signal light can be selected based on the first filtering spectrum. Therefore, the first filtering spectrum can be updated to a second filtering spectrum that is different from the first filtering spectrum, so that the second filtering spectrum can be used to filter the signal light, thereby further reducing the filtering cost and achieving optimization of the filtering cost.

[0016] In one possible implementation, a first control element is configured to receive a second instruction for the signal light sent by a second control element, and to obtain a second parameter based on the second instruction.

[0017] In this implementation, the first control element does not need to be aware of the relationship between the filtering cost and the filtering threshold. It can simply update the first filtering spectrum to the second filtering spectrum based on the second instruction, which is relatively simple and flexible.

[0018] In a second aspect, an optical filtering system is provided, which includes the optical filtering device provided in the first aspect or any possible implementation thereof, and further includes at least one of the monitoring element or the second control element described above.

[0019] Thirdly, a filtering method is provided, which is applied to a first control element included in the optical filtering device provided in the first aspect or any possible implementation of the first aspect. The first control element is configured with multiple parameters, each indicating a different filtering spectrum. In the filtering method, the first control element acquires a first parameter corresponding to the signal light among the multiple parameters, and controls a spatial light modulation element according to the first parameter, causing the spatial light modulation element to filter the signal light according to the first filtering spectrum indicated by the first parameter.

[0020] In one possible implementation, the first filter spectrum is matched with the characteristic information of the signal light, the characteristic information indicating at least one of the physical characteristics and scene characteristics of the signal light, the physical characteristics of the signal light including at least one of the channel spacing, center frequency, baud rate or modulation format of the signal light, and the scene characteristics indicating whether the filtered signal light is rerouted.

[0021] In one possible implementation, obtaining the first parameter corresponding to the signal light among multiple parameters includes: receiving feature information sent by a monitoring element; determining the parameter corresponding to the feature information among multiple parameters as the first parameter, such that the first filter spectrum indicated by the first parameter matches the feature information.

[0022] In one possible implementation, obtaining the first parameter corresponding to the signal light among multiple parameters includes: receiving a first instruction for the signal light sent by a second control element; and determining the parameter corresponding to the first instruction among the multiple parameters as the first parameter.

[0023] In one possible implementation, the filtering method further includes: when the filtering cost is greater than or equal to a cost threshold, the first control element acquires a second parameter corresponding to the signal light, the second parameter being different from the first parameter, and the filtering cost being the cost of filtering the signal light according to the first filtering spectrum; and controls the spatial light modulation element according to the second parameter, so that the spatial light modulation element filters the signal light according to the second filtering spectrum indicated by the second parameter, the second filtering spectrum being different from the first filtering spectrum.

[0024] In one possible implementation, obtaining the second parameter corresponding to the signal light includes: receiving a second instruction sent by a second control element for the signal light; and obtaining the second parameter according to the second instruction.

[0025] Fourthly, a chip is provided that includes a processor for retrieving and executing instructions stored in memory, causing a computer equipped with the chip to perform the filtering method provided by the third aspect or any possible implementation thereof.

[0026] Fifthly, another chip is provided, which includes an input interface, an output interface, a processor, and a memory. The input interface, output interface, processor, and memory are connected through an internal connection path. The processor is used to execute code in the memory. When the code is executed, the computer with the chip installed executes the filtering method provided by the third aspect or any possible implementation of the third aspect.

[0027] The technical effects achieved by the technical solutions and corresponding possible implementations of the second to fifth aspects of this application can be found in the technical effects achieved by the first aspect and corresponding possible implementations described above, and will not be repeated here. Attached Figure Description

[0028] Figure 1 A schematic diagram of a WDM network provided in an embodiment of this application;

[0029] Figure 2 A schematic diagram of a spectral width provided for an embodiment of this application;

[0030] Figure 3 A schematic diagram of a related technology provided for an embodiment of this application;

[0031] Figure 4 A schematic diagram of another related technology provided for an embodiment of this application;

[0032] Figure 5 A schematic diagram of an optical filtering device provided in an embodiment of this application;

[0033] Figure 6 A schematic diagram of two optical filtering devices provided in an embodiment of this application;

[0034] Figure 7 A schematic diagram of an optical filtering system provided in an embodiment of this application;

[0035] Figure 8 A schematic diagram of another optical filtering system provided in an embodiment of this application;

[0036] Figure 9 A schematic diagram of multiple filter spectra provided in an embodiment of this application;

[0037] Figure 10 A flowchart illustrating the process of determining a filter spectrum type is provided for an embodiment of this application;

[0038] Figure 11 This application provides a schematic diagram illustrating the relationship between insertion loss and filtering cost in an embodiment of the present application.

[0039] Figure 12 This is a flowchart illustrating a filtering method provided in an embodiment of this application. Detailed Implementation

[0040] The terminology used in the implementation section of this application is for the purpose of explaining specific embodiments of this application only, and is not intended to limit this application.

[0041] In optical communication technology, light output from light sources such as lasers is modulated and processed to obtain signal light carrying service information. This signal light, carrying service information, is then transmitted through optical fibers in an optical transmission network to achieve communication. WDM networks are optical transmission networks that use wavelength division multiplexing (WDM) technology. WDM technology can combine signal light of different wavelengths (carrying different service information) into multi-wavelength signal light, which is then transmitted through the same optical fiber, thereby improving the transmission capacity and efficiency of the fiber. Since the wavelength and frequency of light can be equivalently converted based on the speed of light, WDM technology is also called frequency division multiplexing (FDM).

[0042] See Figure 1 , Figure 1 An exemplary WDM network is shown, including the following apparatus or devices.

[0043] Equipment, such as Figure 1 The first to fourth devices shown include a transmitter unit (Tx) and a receiver unit (Rx). Tx is used to transmit signal light carrying service information, and Rx is used to receive signal light carrying service information. The signal light carrying service information has a certain wavelength and frequency.

[0044] An optical transform unit (OTU) is used to process signal light carrying service information, such as performing wavelength conversion.

[0045] A multiplexing device is used to multiplex signal light carrying service information of different wavelengths into multi-wavelength signal light, i.e., to perform multiplexing. Alternatively, if a single-wavelength signal light carrying service information is received, it can be output directly.

[0046] A wavelength division multiplexing (WDM) device is used to demultiplex multi-wavelength signal light into different wavelengths of signal light carrying service information, i.e., to perform wavelength division. Alternatively, if a single-wavelength signal light is received, it can be output directly.

[0047] Optical amplifier (OA), i.e. Figure 1 The triangle shown is used to amplify the received signal light (multi-wavelength signal light or single-wavelength signal light).

[0048] A fiber interface unit (FIU) is used to send received signal light (multi-wavelength signal light or single-wavelength signal light) into an optical fiber for transmission.

[0049] An optical add-drop multiplexer (OADM) includes a wavelength division multiplexing (WDM) unit and a wavelength multiplexing (WDM) unit. The WDM unit demultiplexes multi-wavelength signal light or directly outputs a single-wavelength signal light to obtain the signal light, which is then output through the output port (…). Figure 1 The signal light (not shown) is transmitted to the multiplexing device in the OADM, or transmitted to other components through the output port. The multiplexing device in the OADM transmits the received signal light through the input port (…). Figure 1 (Not shown) It can receive signal light transmitted by the wavelength division multiplexing device, and can also receive signal light transmitted by other components through the input port. If different signal light is received, it is multiplexed into multi-wavelength signal light. If a single signal light is received, it is directly output so that multi-wavelength signal light or single-wavelength signal light can continue to be transmitted through the optical fiber.

[0050] For example, OADMs include, but are not limited to, reconfigurable OADMs (ROADMs). Additionally, Figure 1 The example illustrates a scenario where an OADM is included between the first device and the second device. Multiple OADMs can be cascaded between the first device and the second device according to actual needs.

[0051] In one example, during the transmission of service information from the first device to the second device, the first device's Tx sends a signal light carrying the service information. The OTU performs wavelength conversion on the signal light carrying the service information to obtain wavelength-converted signal light 1 (carrying the service information). A multiplexing device multiplexes the wavelength-converted signal light 1, for example, by multiplexing it with a signal light from a third device to obtain multi-wavelength signal light 1. Multi-wavelength signal light 1 is transmitted through OA, FIU, and optical fiber to OADM. The OADM performs wavelength division multiplexing and multiplexing on multi-wavelength signal light 1 to obtain multi-wavelength signal light 2 (which may be the same as or different from multi-wavelength signal light 1). Multi-wavelength signal light 2 is transmitted through OA, FIU, and optical fiber to a wavelength division multiplexing device. The wavelength division multiplexing device demultiplexes multi-wavelength signal light 2 to obtain a signal light carrying the service information. The OTU performs wavelength conversion on the signal light carrying the service information to obtain wavelength-converted signal light 2 (carrying the service information). The second device's Rx receives the wavelength-converted signal light 2, thus realizing the transmission of service information.

[0052] The multiplexing and demultiplexing devices described above filter the signal light and are therefore also called optical filters. Optical filters can filter the signal light according to a specific filtering spectrum. The filtering process causes filtering impairments to the signal light, suppressing its spectral width and incurring filtering costs. The spectral width of the signal light refers to its width in the wavelength or frequency dimension. The more cascaded OADMs (Optical Optical Filtering Devices) there are end-to-end (e.g., between the first and second devices mentioned above), the more cascaded optical filters there are, resulting in more filtering impairments, greater suppression of the signal light's spectral width, and higher filtering costs. For example, see... Figure 2 , Figure 2 The horizontal axis represents frequency, with units such as gigahertz (GHz) or terahertz (THz), and the vertical axis represents insertion loss, with units such as decibel. The spectral width of the signal light transmitted by Tx is the width between points A and B. The 2-stage optical filter (first OADM), 4-stage optical filter (second OADM), and 6-stage optical filter (third OADM) use different filter spectra, with the spectral width decreasing sequentially for each filter spectra. The more optical filters the signal light transmitted by Tx passes through, the more the spectral width of the signal light is suppressed, and the greater the filtering cost.

[0053] Therefore, the filtering spectrum used by the optical filter affects the filtering cost, which in turn affects communication performance; the filtering cost is the core transmission cost in WDM networks. On the one hand, a higher filtering cost indicates that the spectral width is suppressed more, weakening the ability to carry service information and reducing the actual bit rate and baud rate provided by the signal light. This results in a larger gap between the actual bit rate and baud rate and the required bit rate and baud rate, for example, the required bit rate might be 400 to 800 gigabits per second (Gbit / s) for a single-wavelength signal light. On the other hand, a higher filtering cost results in a lower optical signal-to-noise ratio (OSNR) and poorer communication quality. Therefore, the optical filter needs to filter the signal light according to an appropriate filtering spectrum.

[0054] like Figure 3 As shown, in related technology one, an optical filter device is provided ( Figure 3 The diagram shows an optical frequency domain equalizer (ONE) connected to a wavelength division multiplexer (WDM). An optical filter filters the signal light according to a fixed filter spectrum, obtaining and outputting the filtered signal light. The ONE then shapes the frequency of the filtered signal light to reduce filtering costs. However, this method, by including the ONE, not only increases cost and insertion loss, but also makes the ONE more complex as it relies on manual adjustment. Furthermore, the fixed filter spectrum used by the optical filter is somewhat limiting.

[0055] like Figure 4 As shown in the related technology two, Tx transmits signal light, OADM filters the signal light according to filter spectrum 1, and after Rx receives the signal light, the chip connected to Rx detects the filter cost 1 corresponding to filter spectrum 1 in real time. Figure 4 As shown in (1), the filtering cost 1 (corresponding to) is reported to the management unit. Figure 4 As shown in (2), the management unit determines the filter spectrum 2 in real time based on the filter cost 1, and adjusts the filter spectrum used by OADM to filter spectrum 2 (corresponding to...). Figure 4As shown in (3), the OADM then filters the signal light according to the filtering spectrum 2. After Rx receives the signal light, the chip connected to Rx detects the filtering cost 2 corresponding to the filtering spectrum 2 in real time and reports the filtering cost 2 to the management unit. The management unit determines the filtering spectrum 3 in real time according to the filtering cost 2 and adjusts the filtering spectrum used by the OADM to the filtering spectrum 3. This process is repeated multiple times, that is, (1) to (3) are completed multiple times until the filtering cost is reduced to meet the requirements. However, this method relies on the optical channel between Tx and Rx and the telecommunication channel between Rx and the chip, which requires optoelectronic integration and is relatively complex. In addition, the chip detects the filtering cost in real time, and the management unit determines and adjusts the filtering spectrum of the OADM in real time according to the filtering cost, which takes a long time and is inefficient.

[0056] To address this, embodiments of this application provide an optical filtering device and an optical filtering system, which can quickly and accurately determine a suitable filter spectrum for signal light without increasing costs, thereby reducing filtering costs and improving communication performance. For ease of understanding, the following will first consider... Figures 5 to 8 The components included in the optical filtering device and optical filtering system are described, followed by a detailed explanation of the function of each component.

[0057] See Figure 5 The optical filtering device provided in this application includes a first control element and a spatial light modulation element, wherein the first control element is connected to the spatial light modulation element. The first control element controls the spatial light modulation element so that the spatial light modulation element filters the signal light according to a suitable filtering spectrum. Figure 5 The arrows in the diagram indicate the propagation path of the signal light.

[0058] For example, optical filtering devices include, but are not limited to, wavelength selective switches (WSS). WSS can perform wavelength division (demultiplexing) and wavelength combination (multiplexing), and also has a filtering function for signal light. Optionally, WSS can also achieve optical crossover through a combination of wavelength division and combination. In WSS, the first control element is, for example, a digital signal processing (DSP) or microcontroller unit (MCU) chip, and the spatial light modulation element is, for example, a liquid crystal on silicon (LCoS) element.

[0059] Optionally, the number of optical filtering devices is at least two. Of the at least two optical filtering devices, one portion is used for wavelength division and filtering, also known as a drop optical filter (e.g., drop WSS), while the other portion is used for wavelength multiplexing and filtering, also known as an add optical filter (e.g., add WSS). See, for example, [link to relevant documentation]. Figure 6 , Figure 6 The example shown illustrates a case with two optical filters. Cases with more optical filters are not illustrated here. At least two optical filters can form an OADM, including but not limited to a ROADM.

[0060] like Figure 7 As shown, the optical filtering system provided in this embodiment includes an optical filtering device and a second control element. The second control element is communicatively connected to a first control element in the optical filtering device. The second control element sends instructions to the first control element in the optical filtering device, causing the first control element to control the spatial light modulation element according to the instructions, thereby enabling the spatial light modulation element to filter the signal light according to a suitable filtering spectrum. Of course, the first control element controlling the spatial light modulation element according to the instructions sent by the second control element is only one example. In the absence of a second control element, the first control element can also control the spatial light modulation element independently.

[0061] For example, the second control element is a chip such as a DSP or MCU. In one example, both the second control element and the optical filtering device are located on a single board, such as the single board included in the OADM. In another example, the second control element is located on a device other than the OADM, such as on a management device (for managing the OADM), or on a device that transmits or receives signal light carrying service information (e.g., Figure 1 (The first to fourth devices shown are examples of this). In yet another example, the optical filtering system includes two second control elements, one located on a single board included in the OADM, and the other located on a separate device outside the OADM.

[0062] Optionally, such as Figure 8As shown, the optical filtering system also includes a monitoring element, which monitors the acquired information (details omitted here, but will be explained in detail below). The monitoring element can send information to the first control element, enabling the first control element to control the spatial light modulation element based on the information, thereby causing the spatial light modulation element to filter the signal light according to a suitable filtering spectrum. If the optical filtering system includes a second control element, the monitoring element can send information to the second control element, enabling the second control element to send instructions to the first control element in the optical filtering device based on the information, thereby causing the first control element to control the spatial light modulation element according to the instructions, and thus causing the spatial light modulation element to filter the signal light according to a suitable filtering spectrum.

[0063] See also Figure 8 For optical filtering devices used for wavelength division and filtering (e.g., drop WSS), the monitoring element can be located upstream of the optical filter to monitor and transmit information for all signal light input to the optical filter. For optical filtering devices used for wavelength multiplexing and filtering (e.g., add WSS), the monitoring element can be located downstream of the optical filter to monitor and transmit information for all signal light output to the optical filter.

[0064] For example, the monitoring element is a light sensor (LS) or an optical performance monitor (OPM). An LS can also be called a light tag sensor, and an OPM can also be called an optical channel performance monitor.

[0065] As described above, the optical filtering system includes an optical filtering device and at least one of a second control element or a monitoring element. In addition, the optical filtering system may also include an OA (i.e., Figure 8 The components (such as the triangle shown) and FIU can be set according to actual needs. This application does not limit the components included in the optical filtering system.

[0066] Next, the functions of each component included in the optical filtering device and optical filtering system will be explained in detail.

[0067] The first control element is configured with multiple parameters, each indicating a different filtering spectrum. The first control element is used to acquire a first parameter corresponding to the signal light among the multiple parameters, and also to control a spatial light modulation element based on the first parameter. The spatial light modulation element is used to filter the signal light according to the first filtering spectrum indicated by the first parameter.

[0068] Since different parameters among the multiple parameters indicate different filtering spectra, the first parameter corresponding to the signal light among the multiple parameters also indicates a certain filtering spectra, namely the first filtering spectra. Therefore, the first control element controls the spatial light modulation element according to the first parameter, and the spatial light modulation element can filter the signal light according to the first filtering spectra. Thus, the optical filtering device quickly and accurately determines the appropriate filtering spectra from different filtering spectra, which helps to reduce filtering costs and improve communication performance. Different filtering spectra can be obtained through regression analysis, etc. Examples of different filtering spectra can be found in [reference needed]. Figure 9 , Figure 9 Nine filter spectra are shown, ranging from 0.0dB shaping to 4.0dB shaping. 0.0dB shaping refers to shaping without reducing insertion loss, while 4.0dB shaping refers to shaping with an insertion loss reduction of approximately 4.0dB. This is because the insertion loss peak value corresponding to 4.0dB shaping is -9dB, which is approximately 4.0dB lower than the insertion loss peak value of -5dB corresponding to 0.0dB shaping.

[0069] Compared to related technology one, the embodiments of this application do not require setting up an optical frequency domain equalizer, avoiding increased costs and insertion loss. They do not rely on manual adjustment, making implementation simpler. The first filter spectrum is quickly determined from multiple first filter spectra, rather than being fixed, thus being more accurate and flexible. Compared to related technology two, the embodiments of this application do not require optoelectronic integration, making implementation simpler. They do not require real-time detection of filtering costs, nor do they require real-time determination and adjustment of the filter spectrum based on filtering costs. Therefore, determining the first filter spectrum is less time-consuming and more efficient.

[0070] For example, when the optical filtering device is a WSS, the spatial light modulation element can be an LCoS. The LCoS includes multiple pixels, and the first parameter includes at least one of the current value or voltage value corresponding to each pixel. The first control element controls the LCoS according to the first parameter, for example, by applying at least one of the current value or voltage value corresponding to each pixel to each pixel. This causes the LCoS to undergo liquid crystal deflection, thereby changing the modulation curve (i.e., window function) of the LCoS, and thus changing the filtering spectrum used by the LCoS when filtering the signal light. This achieves pixel-level editing of the filtering spectrum, enabling the LCoS to filter the signal light according to the first filtering spectrum indicated by the first parameter.

[0071] In an exemplary embodiment, a first control element is configured to receive feature information sent by a monitoring element, and determine a parameter corresponding to the feature information from among multiple parameters as a first parameter, such that the first filter spectrum indicated by the first parameter matches the feature information. For example, the first control element may store a first mapping between feature information and parameters. After acquiring the feature information of the signal light, it queries the first mapping based on the feature information to obtain the first parameter corresponding to the feature information. Since different feature information of the signal light may result in different filter spectra applicable to filtering the signal light, matching the first filter spectrum with the feature information of the signal light ensures the accuracy of the first filter spectrum, which helps reduce filtering costs and improve communication performance.

[0072] For example, the characteristic information of the signal light indicates at least one of the physical characteristics and scene characteristics of the signal light, whereby the scene characteristics indicate whether the filtered signal light should be rerouted. Rerouting refers to changing the transmission path of the signal light. For instance, if one transmission path used to transmit the signal light fails, rerouting can determine another transmission path for transmitting the signal light, facilitating timely restoration of service. Service refers to the service provided by the service data carried by the signal light. Figure 1 Taking the example shown, the transmission path before signal optical rerouting is from the first device to the second device, and the transmission path after rerouting can be from the first device to other components.

[0073] Optionally, the physical characteristics of the signal light include at least one of the following: channel spacing, center frequency, baud rate, or modulation format. Different spectral widths of signal light correspond to different channel spacings, center frequencies, and baud rates, with the baud rate positively correlated with the spectral width. The channel spacing and center frequency can be defined according to standards. Channel spacing includes, but is not limited to, 50 GHz, 100 GHz, or 150 GHz. Channel spacing can also be referred to as channel bandwidth. Center frequencies corresponding to a 50 GHz channel spacing include, but are not limited to, 196.05 THz, 196.00 THz, and 195.95 THz, while center frequencies corresponding to a 100 GHz channel spacing include, but are not limited to, 192.10 THz, 192.20 THz, and 192.30 THz. Further examples are not provided here. Additionally, modulation formats include, but are not limited to, quadrature amplitude modulation (QAM) or quadrature phase shift keying (QPSK) modulation. Modulation formats can also be referred to as code patterns.

[0074] For example, different filter spectra can be used when the modulation format of the signal light is different. Different filter spectra have different specifications, including but not limited to at least one of 3dB bandwidth or ripple. These specifications can be defined according to standards or other definitions based on actual needs, and this application does not limit them. For example, when the signal light uses QAM modulation, a filter spectra with a larger 3dB bandwidth and a larger ripple can be used. When the signal light uses QPSK modulation, a filter spectra with a smaller 3dB bandwidth and a smaller ripple can be used.

[0075] In this embodiment, the monitoring element monitors the signal light and obtains and sends characteristic information to the first control element. Optionally, the characteristic information is information carried by the signal light; that is, in addition to carrying service data, the signal light also carries characteristic information. For example, when modulating light emitted from a light source such as a laser, modulation is performed according to service data to obtain modulated signal light, and then the modulated signal light is modulated again according to the characteristic information to obtain signal light carrying both service data and characteristic information. Based on this, the monitoring element can obtain the characteristic information of the signal light by demodulating the signal light.

[0076] In one example, the signal light is a single-wavelength signal light. The monitoring element monitors the single-wavelength signal light to obtain its corresponding characteristic information. In another example, the signal light is a multi-wavelength signal light. The monitoring element monitors each single-wavelength signal light separately to obtain its characteristic information. The monitoring element sends the characteristic information of each single-wavelength signal light to a first control element. The first control element receives the characteristic information of each single-wavelength signal light and obtains a first parameter corresponding to each single-wavelength signal light based on its characteristic information, such that the first filter spectrum indicated by each first parameter matches the characteristic information of the corresponding single-wavelength signal light.

[0077] For example, see Figure 8 The monitoring elements include those related to OA (i.e., Figure 8The OPM (Optical Array Module) is connected in a triangle (as shown). On the input side, the OA (Optical Array Optical Array) amplifies the multi-wavelength signal light. The amplified multi-wavelength signal light then enters the optical filter (wavelength divider) and the OPM. The OPM demultiplexes the multi-wavelength signal light into multiple single-wavelength signal lights, monitors the characteristic information of each single-wavelength signal light, and sends this characteristic information to the first control element. On the output side, the multi-wavelength signal light is output to the optical filter (wavelength combiner). The OA amplifies the multi-wavelength signal light, and the amplified multi-wavelength signal light is transmitted through optical fiber and then enters the OPM. The OPM demultiplexes the multi-wavelength signal light into multiple single-wavelength signal lights, monitors the characteristic information of each single-wavelength signal light, and sends this characteristic information to the first control element.

[0078] For example, see Figure 8 The monitoring element includes an optical filter (LS). On the input side, the optical amplifier (OA) amplifies the multi-wavelength signal light. The amplified multi-wavelength signal light then enters an optical filter (wavelength divider) and also enters the LS. The LS monitors and obtains the characteristic information of each single-wavelength signal light through demodulation and other methods, and sends the characteristic information of each single-wavelength signal light to the first control element. On the output side, the multi-wavelength signal light is output to an optical filter (wavelength combiner). The OA amplifies the multi-wavelength signal light, and the amplified multi-wavelength signal light is transmitted through optical fiber and also enters the LS. The LS monitors and obtains the characteristic information of each single-wavelength signal light through demodulation and other methods, and sends the characteristic information of each single-wavelength signal light to the first control element.

[0079] After acquiring the feature information of each single-wavelength signal light, the first control element obtains the first parameter corresponding to each single-wavelength signal light based on the feature information of each single-wavelength signal light, and controls the spatial light modulation element according to the first parameter corresponding to each single-wavelength signal light, so that the spatial light modulation element filters each single-wavelength signal light according to the first filter spectrum indicated by each first parameter.

[0080] Taking a WSS (Light Filtering System) as the optical filter and an LCoS (Light CoS) as the spatial light modulation element as an example, the multiple pixels in the LCoS can be divided into multiple channels, and each channel includes a portion of the pixels. Different single-wavelength signal lights correspond to different channels because after entering the WSS, the multi-wavelength signal lights are demultiplexed into multiple single-wavelength signal lights within the WSS. Different single-wavelength signal lights will fall at different positions on the LCoS, thus corresponding to different channels. Therefore, for each single-wavelength signal light, based on a first parameter, the first control element controls the channel corresponding to that single-wavelength signal light. For example, it applies at least one of the current or voltage values ​​included in the first parameter to the pixels included in the channel, thereby achieving differentiated control of the pixels included in different channels. For instance, single-wavelength signal light 1 corresponds to first parameter 1 and channel 1, and single-wavelength signal light 2 corresponds to first parameter 2 and channel 2. The first control element applies the current or voltage value included in first parameter 1 to the pixels included in channel 1, and applies the current or voltage value included in first parameter 2 to the pixels included in channel 2.

[0081] In an exemplary embodiment, the first control element is further configured to acquire a second parameter corresponding to the signal light when the filtering cost is greater than or equal to a cost threshold. The second parameter is different from the first parameter, and the filtering cost is the cost of filtering the signal light according to the first filtering spectrum. The first control element is further configured to control a spatial light modulation element according to the second parameter. The spatial light modulation element is further configured to filter the signal light according to a second filtering spectrum indicated by the second parameter, the second filtering spectrum being different from the first filtering spectrum.

[0082] In this embodiment, if the filtering cost is greater than or equal to the cost threshold, it indicates that there is still room for reducing the filtering cost based on the first filtering spectrum. Therefore, a second filtering spectrum, different from the first filtering spectrum, can be used to filter the signal light, thereby further reducing the filtering cost and achieving optimization of the filtering cost. Since the signal light is continuous, in this embodiment, the first filtering spectrum is used for signal light in earlier time periods, while the second filtering spectrum is used for signal light in later time periods.

[0083] In one example, when the signal light is a single-wavelength signal light, the first control element acquires the filtering cost corresponding to the single-wavelength signal light. If the filtering cost is greater than or equal to a cost threshold, it acquires a second parameter corresponding to the single-wavelength signal light to replace the first filtering spectrum corresponding to the single-wavelength signal light with a second filtering spectrum. In another example, when the signal light is a multi-wavelength signal light, the first control element can acquire the filtering cost corresponding to each single-wavelength signal light included in the multi-wavelength signal light. If the filtering cost corresponding to one or more single-wavelength signal lights is greater than or equal to a cost threshold, the first control element acquires the second parameter corresponding to this or these single-wavelength signal lights to replace the first filtering spectrum corresponding to this or these single-wavelength signal lights with a second filtering spectrum.

[0084] When the filtering cost is greater than or equal to the cost threshold, the first control element can determine any parameter different from the first parameter as the second parameter. This second parameter can be a default parameter, and the filtering spectrum indicated by the default parameter is the default filtering spectrum. The default filtering spectrum can be obtained through configuration. The second parameter can also be a parameter included in the first mapping, which is not limited in this embodiment. In addition, the way in which the first control element controls the spatial light modulation element to filter the signal light according to the second filtering spectrum based on the second parameter can be referred to the way in which the first control element controls the spatial light modulation element to filter the signal light according to the first filtering spectrum based on the first parameter described above, which will not be repeated here.

[0085] The preceding text explained how the first control element independently controls the spatial light modulation element. In addition, the first control element can also control the spatial light modulation element based on instructions sent by the second control element, as detailed below.

[0086] In an exemplary embodiment, a first control element is configured to receive a first instruction for the signal light sent by a second control element, and determine the parameter corresponding to the first instruction from among a plurality of parameters as a first parameter. Thus, the first control element can acquire the first parameter and control the spatial light modulation element according to the first parameter, causing the spatial light modulation element to filter the signal light according to a first filtering spectrum indicated by the first parameter.

[0087] In one example, the second control element receives and sends a first instruction to the first control element as a parameter. After receiving the parameter sent by the second control element, the first control element matches the received parameter with multiple configured parameters, and determines the parameter that is the same as or similar to the received parameter from the multiple parameters as the parameter corresponding to the first instruction, i.e., the first parameter.

[0088] In another example, the first instruction received by the second control element and sent to the first control element is an instruction different from the parameter, including but not limited to the parameter index. For example, the first control element is configured with a second mapping between instructions and parameters. After receiving the first instruction sent by the second control element, the first control element matches the first instruction with the second mapping, that is, it queries the second mapping according to the first instruction. If the first instruction is the same as the instruction included in a certain second mapping, then the first instruction matches the second mapping. The first control element takes the parameter included in the matched second mapping as the parameter corresponding to the first instruction among multiple parameters, that is, the first parameter.

[0089] This application does not limit the method by which the second control element obtains the first instruction. For example, the second control element can receive feature information sent by the monitoring element, and obtain the first instruction based on the feature information, so that the first filter spectrum matches the feature information. For instance, the second control element can store a third mapping between feature information and instructions; after receiving feature information sent by the monitoring element, it can query the third mapping based on the feature information to obtain the first instruction corresponding to the feature information. Alternatively, the second control element can generate the first instruction in real time based on the feature information.

[0090] In one example, the signal light is a single-wavelength signal light. The monitoring element monitors the single-wavelength signal light to obtain its corresponding characteristic information. In another example, the signal light is a multi-wavelength signal light. The monitoring element monitors each single-wavelength signal light separately to obtain its characteristic information. The monitoring element sends the characteristic information of each single-wavelength signal light to the second control element. The second control element receives the characteristic information of each single-wavelength signal light, obtains the first instruction corresponding to each single-wavelength signal light based on its characteristic information, and sends the first instruction corresponding to each single-wavelength signal light to the first control element. Accordingly, the first control element determines the first parameter according to the first instruction corresponding to each single-wavelength signal light, and controls the spatial light modulation element according to the first parameter, so that the spatial light modulation element filters each single-wavelength signal light according to the first filter spectrum indicated by each first parameter.

[0091] In an exemplary embodiment, a first control element is configured to receive a second instruction for the signal light sent by a second control element, and obtain a second parameter based on the second instruction. That is, the second control element can obtain a filtering cost for filtering the signal light according to a first filtering spectrum, and in response to the filtering cost being greater than or equal to a cost threshold, obtain a second instruction for the signal light and send the second instruction to the first control element. The second instruction differs from the first instruction; the second instruction can be an instruction generated in real-time by the second control element based on the filtering cost, or it can be a default instruction. This embodiment does not limit the method by which the second control element obtains the second instruction based on the filtering cost. Therefore, the first control element may not be aware of the relationship between the filtering cost and the cost threshold; the second control element can perceive this relationship and send the second instruction to the first control element.

[0092] In one example, when the signal light is a single-wavelength signal light, the second control element acquires the filtering cost corresponding to the single-wavelength signal light, adaptively determines the second instruction corresponding to the single-wavelength signal light, and sends the second instruction to the first control element to replace the first filtering spectrum corresponding to the single-wavelength signal light with the second filtering spectrum. In another example, when the signal light is a multi-wavelength signal light, the second control element can acquire the filtering cost corresponding to each single-wavelength signal light included in the multi-wavelength signal light. If the filtering cost corresponding to one or more single-wavelength signal lights is greater than or equal to a cost threshold, the second control element acquires the second instruction corresponding to this or these single-wavelength signal lights and sends the second instruction to the first control element to replace the first filtering spectrum corresponding to this or these single-wavelength signal lights with the second filtering spectrum.

[0093] After the second control element sends a second instruction to the first control element, the first control element can query the second mapping according to the second instruction and determine the parameters included in the matched second mapping as the second parameter. Alternatively, after receiving the second instruction, the first control element can determine any parameter different from the first parameter as the second parameter. The second parameter can be a default parameter indicating the default filter spectrum, or it can be a parameter included in the second mapping. This application embodiment does not limit this.

[0094] In an exemplary embodiment, see Figure 10After the optical filtering device starts working, if the first control element does not receive the first instruction sent by the second control element, the first control element controls the spatial light modulation element to filter the signal light according to the default filtering spectrum. If the first control element receives the first instruction sent by the second control element (before or after filtering the signal light according to the default filtering spectrum), the first control element controls the spatial light modulation element to filter the signal light according to the first filtering spectrum corresponding to the first instruction. Optionally, the second control element can automatically send the first instruction based on the feature information sent by the monitoring element after starting working, or it can send the first instruction based on the feature information sent by the monitoring element when it is necessary to reroute the signal light. This application embodiment does not limit the timing of the second control element sending the first instruction.

[0095] The second control element also acquires the filtering cost of filtering the signal light according to the first filtering spectrum. If the filtering cost is less than the filtering threshold, there is no need to send a second instruction to the first control element, and the first control element still controls the spatial light modulation element to filter the signal light according to the first filtering spectrum. Alternatively, if the filtering cost is greater than or equal to the filtering threshold, the second control element sends a second instruction to the first control element, and the first control element controls the spatial light modulation element to filter the signal light according to the second filtering spectrum corresponding to the second instruction. Optionally, the filtering cost of filtering the signal light according to the first filtering spectrum is recorded as filtering cost 1, and the filtering cost of filtering according to the default filtering spectrum is recorded as filtering cost 2. Filtering cost 1 being greater than or equal to the filtering threshold can mean that filtering cost 1 is greater than filtering cost 2. Correspondingly, the second filtering spectrum can refer to the default filtering spectrum. That is, in this embodiment, the optical filtering device can first filter according to the default filtering spectrum, and then filter according to the first filtering spectrum. If filtering according to the first filtering spectrum results in an increased filtering cost, filtering according to the default filtering spectrum can be reverted.

[0096] Optionally, when there are multiple second control elements, multiple second control elements can be reasonably applied. Taking two second control elements as an example, the two second control elements are denoted as second control element 1 and second control element 2, respectively. In one example, second control element 1 and second control element 2 are applied to different scenarios. For example, in a rerouting scenario, second control element 1 sends instructions (first instruction or second instruction, etc.) to the first control element, while in a non-rerouting scenario, second control element 2 sends instructions to the first control element. In another example, second control element 1 and second control element 2 have different permissions. For example, second control element 1 has higher permissions than second control element 2. If second control element 1 and second control element 2 send different instructions to the first control element, then because second control element 1 has higher permissions, the first control element follows the instructions sent by second control element 1 and controls the spatial light modulation element to filter the signal light according to the filtering spectrum corresponding to the instructions sent by second control element 1. For example, the second control element 1 is a control element located on another device outside the OADM, and the second control element 2 is a control element located on a single board inside the OADM. This application embodiment does not limit this.

[0097] In this embodiment, a suitable filter spectrum can be quickly and accurately determined from different filter spectra according to instructions. This is applicable not only to situations where the signal light depends on a specific filter spectrum for filtering, but also helps to reduce filtering costs. Figure 11 As shown, taking a 16-stage optical filter as an example, the embodiments of this application can reduce the filtering cost by about 1.1 dB, that is... Figure 11 The filtering cost is reduced from approximately 3.3 dB to approximately 2.2 dB. However, according to the technical solution provided in this application, rapidly and accurately determining the appropriate filter spectrum from different filter spectra based on instructions may increase the insertion loss of the optical filter device, for example... Figure 11 Reducing the filtering cost by about 1 dB requires increasing the insertion loss by about 3 dB, but the increased insertion loss is acceptable compared to the beneficial effects of reducing the filtering cost.

[0098] The optical filtering device and optical filtering system provided in the embodiments of this application have been described above. Correspondingly, the embodiments of this application also provide a filtering method, which will be discussed below in conjunction with... Figure 12 Please provide an explanation.

[0099] This application provides a filtering method applied to a first control element included in the optical filtering device described above. The first control element is configured with multiple parameters, different parameters indicating different filtering spectra. For example... Figure 12 As shown, the filtering method includes the following steps 1201 and 1202.

[0100] Step 1201: Obtain the first parameter corresponding to the signal light among multiple parameters.

[0101] Step 1202: Control the spatial light modulation element according to the first parameter, so that the spatial light modulation element filters the signal light according to the first filter pattern indicated by the first parameter.

[0102] In an exemplary embodiment, the first filter spectrum is matched with the feature information of the signal light, the feature information indicating at least one of the physical characteristics and scene characteristics of the signal light, the physical characteristics of the signal light including at least one of the channel spacing, center frequency, baud rate or modulation format of the signal light, and the scene characteristics indicating whether the filtered signal light is rerouted.

[0103] Optionally, obtaining the first parameter corresponding to the signal light among multiple parameters includes: receiving feature information sent by the monitoring element; determining the parameter corresponding to the feature information among the multiple parameters as the first parameter, so that the first filter spectrum indicated by the first parameter matches the feature information.

[0104] For example, obtaining the first parameter corresponding to the signal light among multiple parameters includes: receiving a first instruction for the signal light sent by a second control element; and determining the parameter corresponding to the first instruction among multiple parameters as the first parameter.

[0105] For example, the filtering method further includes: when the filtering cost is greater than or equal to a cost threshold, the first control element acquires a second parameter corresponding to the signal light, the second parameter being different from the first parameter, and the filtering cost being the cost of filtering the signal light according to the first filtering spectrum; and controls the spatial light modulation element according to the second parameter, so that the spatial light modulation element filters the signal light according to the second filtering spectrum indicated by the second parameter, the second filtering spectrum being different from the first filtering spectrum.

[0106] For example, obtaining the second parameter corresponding to the signal light includes: receiving a second instruction for the signal light sent by the second control element; and obtaining the second parameter according to the second instruction.

[0107] It should be understood that, Figure 12 The technical effect achieved by the filtering method shown is the same as... Figure 5 and Figure 6 The optical filtering device shown achieves the same technical effect, so it will not be described in detail here. Figure 12 The specific process of the filtering method shown can be found in the descriptions of the optical filtering device and optical filtering system, and will not be repeated here.

[0108] in addition, Figure 12The filtering method shown can be implemented by different functional modules, and the division of these modules can be based on actual needs. For example, different functional modules include an acquisition module and a control module. The acquisition module is used to acquire the first parameter corresponding to the signal light among multiple parameters. The control module is used to control the spatial light modulation element according to the first parameter, so that the spatial light modulation element filters the signal light according to the first filtering spectrum indicated by the first parameter.

[0109] In an exemplary embodiment, the first filter spectrum is matched with the feature information of the signal light, the feature information indicating at least one of the physical characteristics and scene characteristics of the signal light, the physical characteristics of the signal light including at least one of the channel spacing, center frequency, baud rate or modulation format of the signal light, and the scene characteristics indicating whether the filtered signal light is rerouted.

[0110] Optionally, the acquisition module is used to receive feature information sent by the monitoring element; and to determine the parameter corresponding to the feature information among multiple parameters as the first parameter, so that the first filter spectrum indicated by the first parameter matches the feature information.

[0111] For example, the acquisition module is configured to receive a first instruction for the signal light sent by the second control element; and determine the parameter corresponding to the first instruction from among a plurality of parameters as the first parameter.

[0112] For example, when the filtering cost is greater than or equal to the cost threshold, the acquisition module is further configured to acquire a second parameter corresponding to the signal light, the second parameter being different from the first parameter, and the filtering cost being the cost of filtering the signal light according to the first filtering spectrum; the control module is further configured to control the spatial light modulation element according to the second parameter, so that the spatial light modulation element filters the signal light according to the second filtering spectrum indicated by the second parameter, the second filtering spectrum being different from the first filtering spectrum.

[0113] For example, the acquisition module is configured to receive a second instruction for the signal light sent by the second control element; and acquire a second parameter according to the second instruction.

[0114] In an exemplary embodiment, this application also provides a chip including a processor, the processor being configured to retrieve and execute instructions stored in a memory, causing a computer with the chip installed to perform... Figure 12 The filtering method shown.

[0115] For example, this application also provides another chip, which includes an input interface, an output interface, a processor, and a memory. The input interface, output interface, processor, and memory are connected through internal interconnection paths. The processor is used to execute code in the memory. When the code is executed, the computer with the chip installed performs... Figure 12 The filtering method shown.

[0116] Optionally, there may be one or more processors and one or more memories. The memory may be integrated with the processor or may be separately configured. The chip provided in this embodiment is, for example, the first control element described above.

[0117] In this application, the terms "first," "second," etc., are used to distinguish identical or similar items with essentially the same function. It should be understood that there is no logical or temporal dependency between "first," "second," and "nth," nor does it limit the quantity or execution order. It should also be understood that although the terms "first," "second," etc., are used in the description of this application to describe various elements, these elements are not limited by the terms. These terms are merely used to distinguish one element from another.

[0118] It should also be understood that, in the various embodiments of this application, the sequence number of each process does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0119] In this application, the term "multiple" means two or more; for example, multiple correspondences refer to two or more correspondences. The terms "system" and "network" are often used interchangeably.

[0120] It should be understood that the terminology used in the description of the various examples herein is for the purpose of describing the particular examples only and is not intended to be limiting. As used in the description of the various examples and the appended claims, the singular forms “a” (“a”, “an”) and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise.

[0121] It should also be understood that the terms “if” and “if” can be interpreted as meaning “when” or “upon”, or “in response to determination” or “in response to detection”. Similarly, depending on the context, the phrases “if determination…” or “if detection [the stated condition or event]” can be interpreted as meaning “when determination…”, or “in response to determination…”, or “when detection [the stated condition or event]” or “in response to detection [the stated condition or event]”.

[0122] The above description is merely an embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the principles of this application should be included within the protection scope of this application.

Claims

1. An optical filtering device, characterized in that, The optical filtering device includes: a first control element and a spatial light modulation element, wherein the first control element is configured with multiple parameters, and different parameters indicate different filtering spectra; The first control element is used to acquire the first parameter corresponding to the signal light among the plurality of parameters; The first control element is further configured to control the spatial light modulation element according to the first parameter; The spatial light modulation element is used to filter the signal light according to the first filter pattern indicated by the first parameter.

2. The optical filtering device according to claim 1, characterized in that, The first filter spectrum is matched with the feature information of the signal light. The feature information indicates at least one of the physical characteristics and scene characteristics of the signal light. The physical characteristics of the signal light include at least one of the channel spacing, center frequency, baud rate or modulation format of the signal light. The scene characteristics indicate whether the filtered signal light is rerouted.

3. The optical filtering device according to claim 2, characterized in that, The first control element is used to receive the feature information sent by the monitoring element; The first control element is configured to determine the parameter corresponding to the feature information among the plurality of parameters as the first parameter, such that the first filter spectrum indicated by the first parameter matches the feature information.

4. The optical filtering device according to claim 1 or 2, characterized in that, The first control element is configured to receive a first command sent by the second control element for the signal light; The first control element is used to determine the parameter corresponding to the first instruction among the plurality of parameters as the first parameter.

5. The optical filtering device according to any one of claims 1-4, characterized in that, The first control element is further configured to acquire a second parameter corresponding to the signal light when the filtering cost is greater than or equal to the cost threshold. The second parameter is different from the first parameter, and the filtering cost is the cost of filtering the signal light according to the first filtering spectrum. The first control element is further configured to control the spatial light modulation element according to the second parameter; The spatial light modulation element is further configured to filter the signal light according to a second filter pattern indicated by the second parameter, wherein the second filter pattern is different from the first filter pattern.

6. The optical filtering device according to claim 5, characterized in that, The first control element is configured to receive a second command sent by the second control element for the signal light; The first control element is used to obtain the second parameter according to the second instruction.

7. An optical filtering system, characterized in that, The optical filtering system comprises the optical filtering device according to any one of claims 1-6 and at least one of the following elements: The monitoring element as described in claim 3; The second control element as described in claim 4 or 6.

8. A filtering method, characterized in that, The filtering method is applied to a first control element in the optical filtering device according to any one of claims 1-6, the first control element being configured with multiple parameters, different parameters indicating different filtering spectra, and the filtering method comprising: Obtain the first parameter corresponding to the signal light among the plurality of parameters; The spatial light modulation element is controlled according to the first parameter, so that the spatial light modulation element filters the signal light according to the first filter pattern indicated by the first parameter.

9. The filtering method according to claim 8, characterized in that, The first filter spectrum is matched with the feature information of the signal light. The feature information indicates at least one of the physical characteristics and scene characteristics of the signal light. The physical characteristics of the signal light include at least one of the channel spacing, center frequency, baud rate or modulation format of the signal light. The scene characteristics indicate whether the filtered signal light is rerouted.

10. The filtering method according to claim 9, characterized in that, The first parameter corresponding to the acquired signal light among the plurality of parameters includes: Receive the feature information sent by the monitoring element; The parameter corresponding to the feature information among the plurality of parameters is determined as the first parameter, such that the first filter spectrum indicated by the first parameter matches the feature information.

11. The filtering method according to claim 8 or 9, characterized in that, The first parameter corresponding to the acquired signal light among the plurality of parameters includes: Receive a first command for the signal light sent by the second control element; The parameter that corresponds to the first instruction among the plurality of parameters is determined as the first parameter.

12. The filtering method according to any one of claims 8-11, characterized in that, The filtering method further includes: If the filtering cost is greater than or equal to the cost threshold, a second parameter corresponding to the signal light is obtained. The second parameter is different from the first parameter. The filtering cost is the cost of filtering the signal light according to the first filtering spectrum. The spatial light modulation element is controlled according to the second parameter, so that the spatial light modulation element filters the signal light according to the second filter pattern indicated by the second parameter, the second filter pattern being different from the first filter pattern.

13. The filtering method according to claim 12, characterized in that, The step of obtaining the second parameter corresponding to the signal light includes: Receive a second command for the signal light sent by the second control element; The second parameter is obtained according to the second instruction.

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