Method for amplifying optical transmission, optical amplifier, computer program product, and storage medium

Abstract

Provided in the embodiments of the present disclosure are a method for amplifying optical transmission, an optical amplifier, a computer program product, and a storage medium. It is proposed to design a new operating mode in an erbium-doped fiber amplifier; when a line fault is detected, the erbium-doped fiber amplifier can enter said operating mode. In the operating mode, an input optical signal can be blocked on a transmission link within the erbium-doped fiber amplifier, so that an output unit which is not affected by the input optical signal can be isolated within the erbium-doped fiber amplifier; on this basis, during a fault period, the output unit can be controlled to generate an output optical signal on the basis of an expected output power.

Description

[0001] Optical transmission amplification method, optical amplifier, computer program product and storage medium

[0002]

[0001] The present disclosure relates to the field of communication technology, in particular to an optical transmission amplification method, an optical amplifier, a computer program product and a storage medium. BACKGROUND

[0003]

[0002] Erbium-Doped Fiber Amplifier (EDFA) is a commonly used amplifier in optical transmission systems, which is used to enhance the intensity of optical signals and improve the distance and quality of optical signal transmission.

[0004]

[0003] In optical transmission systems, EDFA usually works in Automatic Gain Control (AGC) mode, in which EDFA can provide constant amplification gain for input optical signals within the working range.

[0005]

[0004] Currently, in the case of line failure in optical transmission systems, the disposal scheme in AGC mode is usually to turn off the pump laser in EDFA, which causes the potassium-doped fiber in EDFA to lose the excitation source, equivalent to turning off the output of EDFA, which may affect the transmission performance of part of the Optical Multiplex Section (OMS) or part of the wavelength band in the optical transmission system, and further cause the performance instability of the optical transmission system. TECHNICAL PROBLEM

[0006]

[0005] Aspects of the present disclosure provide an optical transmission amplification method, an optical amplifier, a computer program product and a storage medium to improve the performance stability of optical transmission systems when line failure occurs.

[0007]

[0006] An embodiment of the present disclosure provides an optical transmission amplification method applicable to an erbium-doped fiber amplifier, the method comprising: if it is monitored that a received input optical signal meets a failure criterion, blocking the input optical signal on a transmission link in the erbium-doped fiber amplifier to isolate an output unit in the erbium-doped fiber amplifier from the input optical signal; determining a desired output power for the erbium-doped fiber amplifier; and controlling the output unit to generate an output optical signal according to the desired output power during a failure period.

[0008]

[0007] Further, blocking the input optical signal on the transmission link within the potassium-doped fiber amplifier includes: adjusting a pre-selected target device on the transmission link to a target state so as to block the input optical signal through the target device.

[0009]

[0008] Further, adjusting the pre-selected target device on the transmission link to a target state includes: if the target device includes a dimming attenuator, controlling the dimming attenuator to switch to an isolation state to block the input optical signal; if the target device includes an optical switch, controlling the optical switch to switch to a preset position to block the input optical signal.

[0009] Further, a dedicated unit is added to the potassium-doped fiber amplifier, and a target optical switch is added to the transmission link as the target device; the target optical switch includes a first position for conducting the transmission link, and also includes a second position for conducting the dedicated unit and the link portion of the transmission link located after the target optical switch; when the target optical switch is switched to the second position, the dedicated unit constitutes the output unit.

[0010]

[0010] Further, if no new component is added to the potassium-doped fiber amplifier, when the target device in the potassium-doped fiber amplifier is adjusted to the target state, the link portion of the transmission link that is still connected to the output end constitutes the output unit.

[0011]

[0011] Further, determining the desired output power includes: obtaining the output power of the potassium-doped fiber amplifier before the fault is detected, as the desired output power; or, using the output power preset for the output unit as the desired output power; or, calculating the desired output power based on the power spectral density preset for the output unit.

[0012]

[0012] Further, the output unit includes a potassium-doped fiber, and controlling the output unit to generate an output optical signal according to the desired output power includes: adjusting the pump power applied to the potassium-doped fiber included in the output unit so that the output optical signal generated by the output unit conforms to the desired output power.

[0013]

[0013] Further, the adjusting the pump power applied to the potassium-doped fiber contained in the output unit comprises: sending a control instruction to a pump laser used by the output unit according to a pump setting parameter recorded for the output unit, so as to control the pump laser to adjust the pump power applied to the potassium-doped fiber contained in the output unit; wherein the pump setting parameter is calculated based on the expected output power.

[0014]

[0014] Further, the method further comprises: performing feedback adjustment on the pump laser based on a difference between the output power detected by the output detector in the potassium-doped fiber amplifier and the expected output power, until the output detector detects that the output optical signal generated by the output unit meets the expected output power; recording the pump setting parameter obtained after the feedback adjustment as the pump setting parameter corresponding to the output unit.

[0015]

[0015] Further, the method further comprises: if it is monitored that the received input optical signal no longer meets the failure criterion, then unblocking the input optical signal; and restoring the pump laser used by the transmission link to the pump power before the failure, so as to restore the potassium-doped fiber amplifier to perform amplification processing on the input optical signal.

[0016]

[0016] Further, the unblocking the input optical signal comprises: restoring a target device used to block the input optical signal on the transmission link from a target state to a state before the adjustment, so as to unblock the input optical signal; wherein the target device has been adjusted to the target state to block the input optical signal after it is monitored that the received input optical signal meets the failure criterion.

[0017]

[0017] Further, the unblocking the input optical signal and the restoring the pump laser used by the transmission link to the state before the failure are synchronously completed.

[0018]

[0018] Embodiments of the present disclosure further provide a potassium-doped fiber amplifier comprising a control component and a transmission link, wherein the control component is configured to execute one or more computer instructions for performing the optical transmission amplification method described above.

[0019]

[0019] Embodiments of the present disclosure further provide a computer-readable storage medium storing a computer program, wherein the computer program, when executed by one or more processors, causes the one or more processors to perform the optical transmission amplification method described above.

[0020]

[0020] The embodiment of the present disclosure further provides a computer program product, comprising a computer program, when the computer program is executed by one or more processors, causing the one or more processors to execute the foregoing optical transmission amplification method.

[0021]

[0021] In the embodiment of the present disclosure, a new working mode is proposed in the potassium-doped fiber amplifier, and the potassium-doped fiber amplifier can enter the working mode when a line fault is monitored. In the working mode, the input optical signal can be blocked on the transmission link in the potassium-doped fiber amplifier, so that the output unit in the potassium-doped fiber amplifier can be isolated from the input optical signal; on this basis, the output unit can generate an output optical signal according to the expected output power during the fault. In this way, in the case of a line fault in the optical transmission system, the potassium-doped fiber amplifier can decouple the output power from the input optical signal based on the working mode, and the output power is no longer affected by the input optical signal, so that the potassium-doped fiber amplifier can still maintain stable output power, thereby ensuring the performance stability of the optical transmission system.

[0022]

[0022] The accompanying drawings described herein are used to provide further understanding of the present disclosure, and form a part of the present disclosure. The exemplary embodiments of the present disclosure and their descriptions are used to explain the present disclosure, and do not constitute an improper limitation on the present disclosure. In the drawings:

[0023]

[0023] FIG. 1 is a flowchart of an optical transmission amplification method provided by an exemplary embodiment of the present disclosure;

[0024]

[0024] FIG. 2 provides a schematic diagram of a conventional structure of a potassium-doped fiber amplifier;

[0025]

[0025] FIG. 3 provides a schematic diagram of an internal structure of a potassium-doped fiber amplifier after hardware modification;

[0026]

[0026] FIGS. 4-6 provide schematic diagrams of internal structures of several potassium-doped fiber amplifiers without hardware modification;

[0027]

[0027] FIG. 7 is a schematic diagram of a structure of a potassium-doped fiber amplifier provided by another exemplary embodiment of the present disclosure;

[0028]

[0028] FIG. 8 is a schematic diagram of a structure of a control device provided by an exemplary embodiment of the present disclosure. DETAILED DESCRIPTION

[0029]

[0029] In order to make the purposes, technical solutions and advantages of the present disclosure clearer, the technical solutions of the present disclosure will be described clearly and completely below in combination with specific embodiments of the present disclosure and corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by a person of ordinary skill in the art without creative labor fall within the protection scope of the present disclosure.

[0030]

[0030] Before starting to describe the technical solutions provided by the embodiments of the present disclosure in detail, the following explains several technical concepts related to the present disclosure.

[0031]

[0031] Erbium-Doped Fiber Amplifier (EDFA) is a commonly used amplifier in optical transmission systems, which is used to enhance the intensity of optical signals and improve the distance and quality of optical signal transmission. The working principle of the EDFA is to amplify light through the process of excitation emission. The main component of the EDFA is an erbium-doped fiber (EDF), which is an optical fiber made of silica and doped with a small amount of rare earth element potassium ion (Er3+).

[0032]

[0032] Pump laser (Pump) is a device based on the principle of laser amplification, which is used to output laser. The pump laser is a commonly used device in the EDFA, and in the EDFA, the laser output by the pump laser can be used to provide pump power to the EDF to excite potassium ions in the EDF, thereby supporting the EDF to amplify optical signals.

[0033]

[0033] Automatic Gain Control (AGC) is a typical working mode of the EDFA. In this working mode, the EDFA can provide a constant amplification gain for the input optical signal within the working range. In optical transmission systems, the EDFA is usually kept in this working mode.

[0034]

[0034] As introduced in the background, in the case of line failure of the optical transmission system, the EDFA in the AGC working mode usually closes the pump laser. Based on the working principle of the EDFA, after the pump laser is closed, the EDF in the EDFA will lose the excitation source, which is equivalent to closing the output of the EDFA.

[0035]

[0035] The inventors have found that the solution of dealing with the line fault by turning off the output of the potassium-doped fiber amplifier can cause the transmission performance of the optical transmission system to be unstable. In an example fault scenario, if the optical transmission system is a multi-band wavelength division multiplexing (WDM) system, turning off the output of the potassium-doped fiber amplifier on a certain wavelength band according to the AGC mode can affect the transmission performance of other wavelength bands. In another example fault scenario, the potassium-doped fiber amplifier is usually located on an optical multiplex section (OMS), and turning off the output of the potassium-doped fiber amplifier according to the AGC mode can cause the output of the OMS where the potassium-doped fiber amplifier is located to be dark. The optical transmission system usually includes multiple OMSs, and one downstream OMS can be connected to multiple upstream OMSs. Thus, from the perspective of the downstream OMS, if the output of a part of the upstream OMSs connected thereto is dark, the transmission performance of the downstream OMS to other OMSs connected thereto can be affected.

[0036]

[0036] The above two fault scenarios are exemplary, and no more examples are given here. However, it should be understood that the solution of dealing with the line fault according to the AGC mode can affect the performance stability of the optical transmission system.

[0037]

[0037] Therefore, the embodiments of the present disclosure propose an optical transmission amplification method to improve the performance stability of the optical transmission system in the case of a line fault of the optical transmission system.

[0038]

[0038] In the optical transmission amplification method proposed by the embodiments, a new working mode is introduced for the potassium-doped fiber amplifier to ensure that the potassium-doped fiber amplifier can maintain stable output power in the case of a line fault of the optical transmission system, thereby avoiding the influence of local line faults on downstream OMSs, and further ensuring the performance stability of the optical transmission system.

[0039]

[0039] The technical solutions provided by the embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.

[0040]

[0040] FIG. 1 is a flowchart of an optical transmission amplification method provided by an example embodiment of the present disclosure, which can be performed by a potassium-doped fiber amplifier. Referring to FIG. 1, the method can include the following steps.

[0041]

[0041] Step 100, if it is monitored that the received input optical signal meets the failure criterion, then block the input optical signal on the transmission link in the potassium-doped fiber amplifier to isolate the output unit from the input optical signal in the potassium-doped fiber amplifier.

[0042]

[0042] Step 101, determine the desired output power for the potassium-doped fiber amplifier.

[0043]

[0043] Step 102, during the failure, control the output unit to generate an output optical signal according to the desired output power.

[0044]

[0044] Figure 2 provides a schematic diagram of a conventional structure of a potassium-doped fiber amplifier. Referring to Figure 2, the potassium-doped fiber amplifier can include a control component and a transmission link, and the transmission link can include devices such as a potassium-doped fiber, a pump laser, an input detector, and an output detector. Of course, these are only a few exemplary main devices, and the transmission link in the potassium-doped fiber amplifier can also include devices such as a gain flattening filter (GFF), a variable optical attenuator (VOA), and a switch (SW) for flattening the gain spectrum of the optical amplifier, and no more examples of devices in the potassium-doped fiber amplifier are provided here. In addition, the functional types of the potassium-doped fiber amplifier are also diverse, including but not limited to a variable gain amplifier (VGA) and a switchable gain amplifier (SGA), and no more examples of functional types are provided here. The internal structures of potassium-doped fiber amplifiers of different functional types differ, that is, in potassium-doped fiber amplifiers of different functional types, the types of devices included can be different, and the connection relationships between the devices can also be different.

[0045]

[0045] The control component can be implemented as software, hardware, or a combination of software and hardware. In this embodiment, it is proposed that a functional logic can be added to the control component in the potassium-doped fiber amplifier to execute the optical transmission amplification method provided in this embodiment by the control component. It should be understood that the functional logic added in the control component in this embodiment does not interfere with the original functional logic in the control component.

[0046]

[0046] Referring to FIG. 1, in step 100, the input optical signal received by the potassium-doped fiber amplifier can be monitored to timely sense a line fault in the optical transmission system according to the input optical signal. To this end, in step 100, a fault criterion can be preset, and if the input optical signal monitored is found to meet the fault criterion, it is indicated that a line fault occurs in the optical transmission system.

[0047] In an exemplary monitoring scheme, the power of the input optical signal detected by the input detector (or input optical power detector) in the potassium-doped fiber amplifier can be tracked, and if the tracked power is lower than a preset power threshold, it can be determined that the input optical signal meets the fault criterion. It should be understood that this is only exemplary, and other monitoring schemes can also be used in the present embodiment to timely sense a line fault in the optical transmission system. For example, a line fault in the optical transmission system can be determined if the degree of fluctuation of the power of the input optical signal is found to be abnormal, etc. No more examples are given here.

[0047]

[0048] In step 100, if the received input optical signal is found to meet the fault criterion, the new working mode introduced in the present embodiment for the potassium-doped fiber amplifier can be switched to. It should be understood that before switching to the new working mode in the present embodiment, the potassium-doped fiber amplifier usually works in the AGC mode mentioned above, and of course, the working mode in which the potassium-doped fiber amplifier originally works is not limited to the AGC mode, which is not limited in the present embodiment.

[0048]

[0049] The new working mode introduced in the present embodiment is described below. In the present embodiment, the new working mode can include at least two working aspects.

[0049]

[0050] Referring to FIG. 1, the first working aspect of the new working mode can be implemented in step 100: the input optical signal is blocked on the transmission link in the potassium-doped fiber amplifier to isolate the output unit in the potassium-doped fiber amplifier from the input optical signal.

[0050]

[0051] The blocking here can be understood as intercepting the input optical signal to prohibit its continuous transmission. As can be seen, in this embodiment, the input optical signal will not be transmitted to the output end of the transmission link, but will be blocked in the middle of the transmission. In this way, a link that is in communication with the output end but is not affected by the input optical signal can be isolated in the potassium-doped fiber amplifier, which is described as an output unit in this embodiment. In this embodiment, the output unit can include one or more potassium-doped fibers, and in the potassium-doped fiber amplifier, each potassium-doped fiber is usually associated with a pump laser. Therefore, the output unit isolated in this embodiment also includes the pump laser to be used. This enables the output unit isolated in this embodiment to have the ability to provide an output optical signal.

[0051]

[0052] As can be seen, in this embodiment, the input optical signal has been blocked outside the output unit, so the output unit will not be affected by the input optical signal, which makes the output unit obtained in this new working mode independent.

[0052]

[0053] With reference back to FIG. 1, the second working aspect in the new working mode can be implemented in steps 101 and 102: regulating the output power of the isolated output unit to enable the potassium-doped fiber amplifier to maintain a stable output power.

[0053]

[0054] In this embodiment, the desired output power can be determined in step 101. Here, the desired output power is the output power that the potassium-doped fiber amplifier is expected to provide after monitoring a line fault. Various implementation manners can be used to determine the desired output power in this embodiment. Several exemplary implementation manners are provided below.

[0054]

[0055] In an exemplary implementation manner: the output power of the potassium-doped fiber amplifier before monitoring the fault can be obtained as the desired output power. In this exemplary implementation manner, the output power detected by the output detector in the potassium-doped fiber amplifier can be tracked, so that the output power tracked before the fault is monitored can be taken as the desired output power. In actual applications, the last output power detected by the output detector before the fault is monitored can be taken as the desired output power; or the average, median or extreme value of a plurality of output powers detected by the output detector in the last detection period before the fault is monitored can be taken as the desired output power, without limitation on how the tracked output power is selected.

[0055]

[0056] In the example implementation, the determined expected output power is consistent with the output power provided by the potassium-doped fiber amplifier before the fault is detected, thus, the output power provided by the potassium-doped fiber amplifier before / after the fault is detected is consistent from the perspective of the output of the potassium-doped fiber amplifier, so that the potassium-doped fiber amplifier can maintain a stable output power.

[0056]

[0057] In another example implementation, the output power previously set for the output unit can be used as the expected output power. The inventors have found in research that the output power of the potassium-doped fiber amplifier is basically unchanged when no channel is added or removed in the optical transmission system, so the fixed output power of the potassium-doped fiber amplifier can be preset as the expected output power required in step 101. Of course, the expected output power can also be preset to other values as long as the performance stability of the optical transmission system can be ensured, which is not limited herein. In actual application, the output power set for the output unit can be configured as a configuration parameter to the control component of the potassium-doped fiber amplifier, and the control component can directly obtain the output power as the expected output power.

[0057]

[0058] In yet another example implementation, the expected output power can be calculated based on the power spectral density previously set for the output unit. The power spectral density is a function describing the power of a signal varying with frequency, which represents the power distribution of the signal at different frequencies. In the frequency domain, the power can be calculated by integrating the power spectral density with the frequency range, and the result of the integration is the power of the signal. It can be seen that the example implementation is similar to the previous example implementation, but uses the power spectral density to indirectly represent the power. In actual application, whether to preset the output power or the power spectral density for the output unit can be flexibly determined according to the structure of the potassium-doped fiber amplifier or the type of signal to be processed, which is not limited herein.

[0058]

[0059] Regardless of which example implementation is adopted, the expected output power determined in the embodiment should be able to ensure the performance stability of the optical transmission system.

[0059]

[0060] As mentioned above, the output unit isolated in step 100 is independent and has the ability to provide an output optical signal, so it is proposed in the embodiment that the output unit can be used to provide the expected output power.

[0060]

[0061] The inventors have found in the course of the investigation that, although no input optical signal transmitted to the potassium-doped fiber amplifier in the optical transmission system will be received by the output unit, the output unit can generate an output optical signal based on the potassium-doped fiber contained in the output unit and the pump laser used, and the output optical signal generated by the output unit is controllable, so that the output unit can support providing the desired output power in this embodiment.

[0062] Based on this, in step 102, the output unit can be controlled to generate an output optical signal according to the desired output power during the failure.

[0061]

[0063] In this embodiment, the control mode of the output unit is not limited, and it is only required to ensure that the output unit maintains providing the desired output power during the failure.

[0062]

[0064] In an alternative implementation, the pump power applied to the potassium-doped fiber contained in the output unit can be adjusted so that the output optical signal generated by the output unit meets the desired output power.

[0063]

[0065] In this alternative implementation, as mentioned above, the output unit isolated in this embodiment contains one or more potassium-doped fibers, and based on this, the pump power applied to the potassium-doped fiber contained in the output unit can be adjusted to adjust the output power of the output unit.

[0064]

[0066] It can be understood that in this alternative implementation, the output unit can generate an output optical signal without relying on any input optical signal, but through the signal generation principle of the potassium-doped fiber itself. The inventors have found in the course of the investigation that, in the absence of an input optical signal, applying a pump power to the potassium-doped fiber can cause amplified spontaneous emission noise (ASE) to be generated in the potassium-doped fiber, and the power of the amplified spontaneous emission noise can vary with the applied pump power. Therefore, in this alternative implementation, the power of the ASE noise generated in the output unit can be adjusted by reasonably adjusting the pump power applied to the potassium-doped fiber contained in the output unit, so that the power of the ASE noise generated in the output unit meets the desired output power mentioned above. That is, in this alternative implementation, the output optical signal generated by the output unit is all ASE noise, and the power of the ASE noise generated meets the desired output power.

[0065]

[0067] In the optional implementation, a feedback mechanism can be used to regulate the output unit. The feedback mechanism can be that, based on the difference between the output power detected by the output detector in the potassium-doped fiber amplifier and the expected output power, the pump laser used by the output unit is adjusted by feedback until the output detector detects that the output unit meets the expected output power. In the feedback mechanism, the pump setting parameters of the pump laser used by the output unit are adjusted by feedback, and the pump power provided by the pump laser changes when the pump setting parameters change. The pump setting parameters can include but are not limited to parameters such as bias current value that affect the pump power, and no more examples are given here. It should be understood that the pump laser used by the output unit can be one or more, and in the feedback mechanism, each pump laser used by the output unit is jointly adjusted to enable the ASE noise generated by one or more potassium-doped fibers contained in the output unit to meet the expected output power.

[0066]

[0068] In the optional implementation, a preferred scheme can be that, the pump setting parameters obtained after the feedback adjustment is ended are recorded as the pump setting parameters corresponding to the output unit. On this basis, after the expected output power is determined, control instructions can be sent to the pump laser used by the output unit according to the pump setting parameters recorded for the output unit, to control the pump laser to adjust the pump power applied to the potassium-doped fiber contained in the output unit. In this way, the time-consuming caused by the foregoing feedback adjustment can be saved, and the pump laser used by the output unit can be adjusted to the appropriate pump setting parameters in one step, which enables the pump laser to quickly switch to the appropriate pump power, so that the output unit can more efficiently reach the expected output power.

[0067]

[0069] It should be understood that the optional implementation described above is only exemplary, and the technical details provided in the optional implementation are also exemplary, and other implementations can also be used to implement step 102 in the present embodiment, and are not limited thereto. For example, during the failure period, a dedicated optical signal with stable input power can be provided to the isolated output unit. By reasonably setting the input power of the dedicated optical signal, it can be ensured that the output optical signal generated after the dedicated optical signal passes through the output unit meets the expected output power. Exemplarily, the input power of the dedicated optical signal can be consistent with the input power of the input optical signal before the failure is detected, and of course, the dedicated optical signal can carry dedicated test data or can not carry any data content, so as to avoid affecting the data layer in the optical transmission system. No more implementation examples are given here.

[0068]

[0070] In addition, in the embodiment, the two working aspects are implemented by the control component in the potassium-doped fiber amplifier, and therefore, the control component can support the two working aspects to be synchronously completed, so that the boundary between the original working mode of the potassium-doped fiber amplifier and the new working mode introduced in the embodiment is clear, and no cross influence occurs. From the perspective of the output of the potassium-doped fiber amplifier, the output power is still stable when the working mode is switched.

[0069]

[0071] Since the input optical signal is blocked outside the output unit in the embodiment, before the fault is removed, no matter how the optical signal on the faulty optical cable changes (the optical signal may change due to events such as optical cable maintenance or fault testing), the output power of the output unit in the embodiment will not be affected, and therefore, the output unit in the embodiment can be stably maintained at the expected output power during the fault.

[0070]

[0072] In the two exemplary fault scenarios mentioned in the foregoing, in one exemplary fault scenario, if the optical transmission system is a multi-band wavelength division multiplexing (WDM) system, in the case of a line fault in a certain band, based on the optical transmission amplification method provided in the embodiment, the output power of the potassium-doped fiber amplifier in the band can be kept stable, and therefore, the transmission performance of other bands in the optical transmission system will not be affected. In another exemplary fault scenario, in the case of a line fault, based on the optical transmission amplification method provided in the embodiment, the output power of the potassium-doped fiber amplifier can be kept stable, which can ensure the output power of the OMS in which the potassium-doped fiber amplifier is stable, and therefore, the transmission performance of the downstream OMS will not be affected.

[0071]

[0073] In summary, in the embodiment, a new working mode is designed in the potassium-doped fiber amplifier, and the potassium-doped fiber amplifier can enter the working mode when a line fault is monitored. In the working mode, the input optical signal can be blocked on the transmission link in the potassium-doped fiber amplifier, so that an output unit that is not affected by the input optical signal can be isolated in the potassium-doped fiber amplifier; on this basis, the output unit can generate an output optical signal according to the expected output power during the fault. In this way, in the case of a line fault in the optical transmission system, the potassium-doped fiber amplifier can realize decoupling between the output power and the input optical signal based on the working mode, and the output power is no longer affected by the input optical signal, and therefore, the potassium-doped fiber amplifier can still maintain stable output power, so as to ensure the performance stability of the optical transmission system.

[0074] In the above or below embodiments, the input optical signal can be blocked on the transmission link in the potassium-doped fiber amplifier by using various implementation manners. A preferred implementation manner is provided as follows: a target device preselected on the transmission link is adjusted to a target state to block the input optical signal by the target device.

[0072]

[0075] In this implementation manner, the target device can be any device with signal blocking capability on the transmission link. The target device can include, but is not limited to, a variable optical attenuator (VOA) or an optical switch (SW), and more examples are not given here.

[0073]

[0076] Taking the above two exemplary target devices as examples, in this implementation manner, it is further proposed that if the target device includes a variable optical attenuator, the variable optical attenuator is controlled to switch to an isolation state (i.e., the target state) to block the input optical signal; if the target device includes an optical switch, the optical switch is controlled to switch to a preset gear (i.e., the target state) to block the input optical signal.

[0074]

[0077] In this implementation manner, the selection scheme of the target device can be adaptively set according to the internal structure of the potassium-doped fiber amplifier. The selection scheme of the target device is described below in two cases.

[0075]

[0078] In the first case, the potassium-doped fiber amplifier can be hardware-reformed.

[0076]

[0079] FIG. 3 provides a schematic diagram of the internal structure of a hardware-reformed potassium-doped fiber amplifier. Referring to FIG. 3, an exemplary hardware-reforming scheme can be that a special unit is added in the potassium-doped fiber amplifier, the special unit can include one or more segments of potassium-doped fiber, and the special unit can use a pump laser (either the original pump laser in the multiplexed potassium-doped fiber amplifier or a special pump laser added); a target optical switch is added on the transmission link in the potassium-doped fiber amplifier, the target optical switch can include a first gear for conducting the transmission link, and can also include a second gear for conducting the special unit and the link part of the transmission link after the target optical switch.

[0077]

[0080] Based on this, in this case, the target optical switch can be preselected as the target device. Referring to FIG. 3, when the target optical switch is switched to the second gear, the special unit constitutes an output unit.

[0078]

[0081] It should be understood that in this case, the dedicated unit is independent of the transmission link in the potassium-doped fiber amplifier, that is, the dedicated unit is dedicated. Based on the dedication and the path isolation capability of the first gear and the second gear in the target light switch, in a preferred implementation, the default pump setting parameters of the pump laser dedicated to the dedicated unit are set to pump setting parameters suitable for the expected output power, which enables the dedicated unit to generate the expected output power by default. In this way, the dedicated unit can be started before or at the same time as the target light switch is switched to the second gear, so that the potassium-doped fiber amplifier can generate the expected output power.

[0079]

[0082] In the second case, the potassium-doped fiber amplifier does not need to be modified in hardware, that is, no new components such as the dedicated unit and the target light switch described above are added to the potassium-doped fiber amplifier.

[0080]

[0083] FIGS. 4-6 provide schematic diagrams of the internal structures of several potassium-doped fiber amplifiers that have not been modified in hardware. The inventors have found in the research process that the internal structures of different models of potassium-doped fiber amplifiers differ. Therefore, the selection scheme of the target device can be adaptively set for different models of potassium-doped fiber amplifiers.

[0084] FIG. 4 provides a schematic diagram of an exemplary internal structure of a gain-adjustable potassium-doped fiber amplifier. Referring to FIG. 4, the transmission link of the potassium-doped fiber amplifier includes a variable optical attenuator VOA. Exemplarily, the VOA on the transmission link can be selected as the target device, and the isolation state can be selected as the target state of the VOA. Based on this, for the potassium-doped fiber amplifier, the variable optical attenuator on the transmission link is adjusted to the isolation state, and the transmission link is divided into two parts. After the division, the part of the link that is still connected to the output end (the part in the dashed box in FIG. 4) becomes the output unit. It can be seen that the input optical signal will be blocked at the variable optical attenuator.

[0081]

[0085] FIG. 5 provides a schematic diagram of an exemplary internal structure of a gain-interval-adjustable potassium-doped fiber amplifier. Referring to FIG. 5, the transmission link of the potassium-doped fiber amplifier includes a variable optical attenuator VOA and an optical switch. Exemplarily, the variable optical attenuator VOA can be selected as the target device, and the isolation state can be selected as the target state of the VOA. Based on this, for the potassium-doped fiber amplifier, the variable optical attenuator on the transmission link is adjusted to the isolation state, and the transmission link is divided into two parts. After the division, the part of the link that is still connected to the output end (the part in the dashed box in FIG. 5) becomes the output unit. It can be seen that the input optical signal will be blocked at the variable optical attenuator.

[0082]

[0086] Fig. 6 provides another exemplary internal structure diagram of the gain-interval-adjustable potassium-doped fiber amplifier. Referring to Fig. 6, the transmission link of the potassium-doped fiber amplifier contains optical switches. Exemplarily, the optical switch on the transmission link can be selected as the target device, and the selected optical switch can be switched to a preset gear to achieve the segmentation of the transmission link, thereby blocking the input optical signal. One blocking method can be that the optical switch 1 is placed in the neutral gear (i.e., not placed in gear 1 or gear 2, but hung in the neutral gear), which can achieve the segmentation of the transmission link by the optical switch 1 as the segmentation point, and the optical switch 2 can be placed in any gear, if placed in gear 1, the output optical signal will be generated by the potassium-doped fiber 1; if placed in gear 2, the output optical signal will be generated by the potassium-doped fiber 2. Referring to Fig. 6, another blocking method can be that the gears of the optical switch 1 and the optical switch 2 are staggered, i.e., the gears of the two are connected to different potassium-doped fibers between the two, to avoid the conduction of the two. As shown in Fig. 6, for example, the optical switch 1 can be placed in gear 1, and the optical switch 2 can be placed in gear 2, so that the output optical signal will be generated by the potassium-doped fiber 2.

[0083]

[0087] The above-mentioned internal structures of the potassium-doped fiber amplifier are exemplary, and the selection scheme of the target device used in these types of internal structures is also exemplary, and the embodiment is not limited thereto. For different models of potassium-doped fiber amplifiers, the selection scheme suitable for the internal structure can be set in the control component in the potassium-doped fiber amplifier, so that the control component in the potassium-doped fiber amplifier can select the target device without obstacles and reasonably.

[0084]

[0088] It can be understood that in the above-mentioned second case, after the selected target device on the transmission link is adjusted to the target state, the segmentation of the transmission link can be achieved, thereby the input optical signal can be blocked. In this case, the segmented transmission link still has a link part connected to the output end, i.e., becomes an output unit. It is worth noting that by reasonably designing the selection scheme of the target device, the output unit obtained after segmentation can contain a potassium-doped fiber and use a pump laser.

[0085]

[0089] Accordingly, in this implementation, the target device can be selected on the transmission link, and the target device is adjusted to the target state to block the input optical signal by the target device. By reasonably selecting the target device, it can be ensured that the isolated output unit has the ability to generate an output optical signal.

[0086]

[0090] It is worth noting that, in addition to the above implementation methods, other implementation methods can also be used in this embodiment to block the input optical signal on the transmission link within the potassium-doped fiber amplifier. For example, a section of potassium-doped fiber on the transmission link can be shut down.

[0087] (For example, the pump power on the first segment) is used to make the output of that potassium-doped fiber unlit. In this way, the input optical signal can be blocked through the potassium-doped fiber segment, and the link section after the potassium-doped fiber segment becomes the output unit. No further examples of implementation methods will be given here.

[0088]

[0091] In the above or below embodiments, when the potassium-doped fiber amplifier is in the aforementioned new operating mode, if the fault is detected to have been cleared, it can switch back from the new operating mode to the original operating mode in which the potassium-doped fiber amplifier was before the fault was detected (e.g., the AGC mode mentioned above).

[0089]

[0092] In this embodiment, the process of switching back from the new operating mode to the original operating mode of the potassium-doped fiber amplifier before the fault was detected can be understood as restoring the changes implemented during the switch from the original operating mode to the new operating mode. To this end, this embodiment proposes: if the received input optical signal no longer meets the fault criteria, then the blocking of the input optical signal is lifted; and the pump laser required for the transmission link is restored to its state before the fault.

[0090] (including restoring pump power, etc.) to enable the potassium-doped fiber amplifier to restore the amplification processing of the input optical signal.

[0091]

[0093] Echoing the optional implementation methods for blocking the input optical signal mentioned earlier, here, the target device on the transmission link used to block the input optical signal can be restored to its state (i.e., restored from the aforementioned target state to the state before adjustment) to release the blocking of the input optical signal. Considering that some of the pump lasers used on the transmission link may have been modulated in the output unit, it is also proposed to restore the pump lasers required for the transmission link to their state before the fault. In this way, the transmission link within the potassium-doped fiber amplifier can be restored to the state before the fault was detected, thus restoring the operational capability before the fault was detected, that is, restoring the amplification processing of the input optical signal.

[0092]

[0094] In addition, as mentioned above, the switching of the working mode is implemented by the control component in the potassium-doped fiber amplifier, and therefore, when switching back from the new working mode to the working mode in which the potassium-doped fiber amplifier was originally in before the fault is detected, the control component can also support the aforementioned "unblocking of the input optical signal" and "restoring the pump laser required by the transmission link to the state before the fault", and the two operations are completed synchronously, thereby avoiding cross-influence between the two working modes and ensuring that the potassium-doped fiber amplifier can maintain stable output power during the switching of the working mode.

[0093]

[0095] It should be noted that in some of the processes described in the above embodiments and the accompanying drawings, a plurality of operations appearing in a specific order are included, but it should be clearly understood that these operations can be executed or performed in parallel without the order in which they appear in this document, and the serial numbers of the operations such as 101, 102, etc. are only used to distinguish different operations, and the serial numbers themselves do not represent any execution order. In addition, these processes can include more or fewer operations, and the operations can be executed in sequence or in parallel. It should be noted that the "first", "second" and the like described herein are used to distinguish different gears, working aspects or situations, and do not represent the order of precedence, nor do they limit the "first" and "second" to be different types.

[0094]

[0096] FIG. 7 is a structural schematic diagram of a potassium-doped fiber amplifier provided by another exemplary embodiment of the present disclosure. As shown in FIG. 7, the potassium-doped fiber amplifier can include a control component 70 and a transmission link 80.

[0095]

[0097] The control component 70 is configured to execute one or more computer program instructions for: if it is detected that the received input optical signal meets the fault standard, blocking the input optical signal on the transmission link 80 in the potassium-doped fiber amplifier to isolate an output unit 90 in the potassium-doped fiber amplifier from the input optical signal; determining a desired output power for the potassium-doped fiber amplifier; and controlling the output unit 90 to generate an output optical signal according to the desired output power during the fault.

[0096]

[0098] In an optional embodiment, when the control component 70 blocks the input optical signal on the transmission link in the potassium-doped fiber amplifier, it can be specifically configured to: adjust a target device preselected on the transmission link 80 to a target state to block the input optical signal through the target device.

[0097]

[0099] In an optional embodiment, the control component 70 can be specifically configured to: if the target device comprises a variable optical attenuator, control the variable optical attenuator to switch to an isolation state to block the input optical signal; or if the target device comprises an optical switch, control the optical switch to switch to a preset gear to block the input optical signal, when the target device preselected on the transmission link is adjusted to the target state.

[0098]

[0100] In an optional embodiment, a dedicated unit is added to the potassium-doped fiber amplifier, and a target optical switch is added to the transmission link 80 as the target device; the target optical switch comprises a first gear for conducting the transmission link 80, and a second gear for conducting the dedicated unit and a link part of the transmission link 80 after the target optical switch; when the target optical switch is switched to the second gear, the dedicated unit constitutes the output unit 90.

[0099]

[0101] In an optional embodiment, if no new component is added to the potassium-doped fiber amplifier, the link part of the transmission link 80 connected to the output end constitutes the output unit 90 when the target device in the potassium-doped fiber amplifier is adjusted to the target state.

[0100]

[0102] In an optional embodiment, the control component 70 can be specifically configured to: obtain the output power of the potassium-doped fiber amplifier before the fault is detected as the expected output power; or set the output power of the output unit as the expected output power; or calculate the expected output power based on the power spectral density of the output unit.

[0101]

[0103] In an optional embodiment, the output unit 90 comprises a potassium-doped fiber 91, and the control component 70 can be specifically configured to: adjust the pump power applied to the potassium-doped fiber 91 in the output unit 90 to make the output optical signal generated by the output unit 90 meet the expected output power, when controlling the output unit 90 to generate an output optical signal according to the expected output power.

[0102]

[0104] In an optional embodiment, the control component 70, when adjusting the pump power applied to the potassium-doped fiber 91 included in the output unit 90, can be specifically configured to: send a control instruction to a pump laser 92 used by the output unit 90 according to a pump setting parameter recorded for the output unit 90, so as to control the pump laser to adjust the pump power applied to the potassium-doped fiber included in the output unit; wherein the pump setting parameter is calculated based on the expected output power.

[0103]

[0105] In an optional embodiment, the control component 70 can be further configured to: perform feedback adjustment on the pump laser 92 based on a difference between the output power detected by an output detector in the potassium-doped fiber amplifier and the expected output power, until the output detector detects that the output optical signal generated by the output unit 90 meets the expected output power; and record the pump setting parameter obtained after the feedback adjustment as the pump setting parameter corresponding to the output unit 90.

[0104]

[0106] In an optional embodiment, the control component 70 can be further configured to: if it is monitored that the received input optical signal no longer meets the failure criterion, remove the blocking of the input optical signal; and restore the pump laser used by the transmission link 80 to the pump power before the failure, so as to restore the potassium-doped fiber amplifier to the amplification processing of the input optical signal.

[0105]

[0107] In an optional embodiment, the control component 70, when removing the blocking of the input optical signal, can be specifically configured to: restore a target device used to block the input optical signal on the transmission link 80 from a target state to a state before the adjustment, so as to remove the blocking of the input optical signal; wherein the target device has been adjusted to the target state to block the input optical signal after it is monitored that the received input optical signal meets the failure criterion.

[0106]

[0108] In an optional embodiment, the removal of the blocking of the input optical signal and the restoration of the pump laser used by the transmission link to the state before the failure are performed synchronously.

[0107]

[0109] Further, as shown in FIG. 7, the transmission link 80 of the potassium-doped fiber amplifier can further include other devices such as an adjustable optical attenuator 81, an optical switch 82, and a potassium-doped fiber 83. Only some devices are shown in FIG. 7, which does not mean that the potassium-doped fiber amplifier only includes the devices shown in FIG. 7.

[0108]

[0110] It is worth mentioning that the above technical details of the embodiments of the potassium-doped fiber amplifier can refer to the related descriptions of the foregoing method embodiments, and will not be described here again in order to save space, but this should not cause the loss of the protection scope of the disclosure.

[0109]

[0111] FIG. 8 is a structural schematic diagram of a control device provided by an exemplary embodiment of the disclosure. The control device can be integrated in a control component of a potassium-doped fiber amplifier. The control device can include: a mode switching module 10 configured to trigger an isolation module 20 if it is monitored that an input optical signal received by the potassium-doped fiber amplifier meets a failure standard; the isolation module 20 configured to block the input optical signal on a transmission link in the potassium-doped fiber amplifier, so as to isolate an output unit in the potassium-doped fiber amplifier from the input optical signal; an output configuration module 30 configured to determine an expected output power for the potassium-doped fiber amplifier; and an output control module 40 configured to control the output unit to generate an output optical signal according to the expected output power during a failure period.

[0110]

[0112] In an optional embodiment, the isolation module 20 can be specifically configured to adjust a target device preselected on the transmission link to a target state, so as to block the input optical signal through the target device.

[0111]

[0113] In an optional embodiment, the isolation module 20 can be specifically configured to: if the target device includes a variable optical attenuator, control the variable optical attenuator to switch to an isolation state to block the input optical signal; or if the target device includes an optical switch, control the optical switch to switch to a preset gear to block the input optical signal.

[0112]

[0114] In an optional embodiment, a dedicated unit is additionally arranged in the potassium-doped fiber amplifier, and a target optical switch is additionally arranged on the transmission link as the target device; the target optical switch includes a first gear for conducting the transmission link, and includes a second gear for conducting the dedicated unit and a link part of the transmission link located after the target optical switch; when the target optical switch switches to the second gear, the dedicated unit constitutes the output unit.

[0113]

[0115] In an optional embodiment, if a new component is not additionally arranged in the potassium-doped fiber amplifier, when the target device in the potassium-doped fiber amplifier is adjusted to the target state, a link part on the transmission link which is still conducted with an output end constitutes the output unit.

[0114]

[0116] In an optional embodiment, the output configuration module 30 can be specifically configured to: obtain the output power of the potassium-doped fiber amplifier before the fault is detected as the expected output power; or, obtain the output power previously set for the output unit as the expected output power; or, calculate the expected output power based on the power spectral density previously set for the output unit.

[0115]

[0117] In an optional embodiment, the output control module 40 can be specifically configured to adjust the pump power applied to the potassium-doped fiber contained in the output unit so that the output optical signal generated by the output unit meets the expected output power.

[0116]

[0118] In an optional embodiment, the output control module 40 can be specifically configured to send a control instruction to the pump laser used by the output unit according to the pump setting parameter recorded for the output unit, so as to control the pump laser to adjust the pump power applied to the potassium-doped fiber contained in the output unit; wherein the pump setting parameter is calculated based on the expected output power.

[0117]

[0119] In an optional embodiment, the output control module 40 can be further configured to: based on the difference between the output power detected by the output detector in the potassium-doped fiber amplifier and the expected output power, perform feedback adjustment on the pump laser until the output detector detects that the output optical signal generated by the output unit meets the expected output power; and record the pump setting parameter obtained after the feedback adjustment is completed as the pump setting parameter corresponding to the output unit.

[0118]

[0120] In an optional embodiment, the mode switching module 10 can be further configured to trigger the isolation module 20 to release the blocking of the input optical signal if it is detected that the received input optical signal no longer meets the fault standard; and the output control module 40 can be further configured to restore the pump laser used by the transmission link to the pump power before the fault, so as to restore the amplification processing of the input optical signal by the potassium-doped fiber amplifier.

[0119]

[0121] In an optional embodiment, the isolating module 20 is configured to, in the process of removing the blockage to the input optical signal, recover the target device used to block the input optical signal on the transmission link from the target state to the state before adjustment, so as to remove the blockage to the input optical signal; wherein, after monitoring that the received input optical signal meets the failure criterion, the target device has been adjusted to the target state to block the input optical signal.

[0120]

[0122] In an optional embodiment, the removing of the blockage to the input optical signal and the recovering of the pump laser required for use of the transmission link to the state before failure are synchronously completed.

[0121]

[0123] Correspondingly, the embodiment of the disclosure also provides a computer readable storage medium storing a computer program, which can realize each step in the method embodiment when the computer program is executed.

[0122]

[0124] Correspondingly, the embodiment of the disclosure also provides a computer program product, which contains a computer program that can realize each step in the method embodiment when the computer program is executed.

[0123]

[0125] Those skilled in the art should understand that the embodiments of the disclosure can be provided as a method, a system, or a computer program product. Therefore, the disclosure can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Moreover, the disclosure can take the form of a computer program product implemented on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROMs, optical storage, etc.) containing computer-usable program code.

[0124]

[0126] The disclosure is described with reference to flowcharts and / or block diagrams of methods, apparatus (systems) and computer program products according to the embodiments of the disclosure. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, and the combination of flows and / or blocks in the flowcharts and / or block diagrams can be realized by computer program instructions. These computer program instructions can be provided to a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing apparatus to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing apparatus produce means for implementing the functions specified in one or more flows in the flowcharts and / or one or more blocks in the block diagrams.

[0125]

[0127] These computer program instructions can also be stored in a computer- readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instructions which implement the function specified in the flowchart or flowsheets and / or block or blocks of the block diagrams.

[0128] These computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart or flowsheets and / or block or blocks of the block diagrams.

[0126]

[0129] It is also important to note that the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises... a" does not, without more constraints, exclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0127]

[0130] The embodiments of the present disclosure described above are merely used to illustrate the present disclosure and not to limit the present disclosure. Various modifications and changes can be made to the present disclosure by those skilled in the art. Any modification, equivalent replacement, improvement, and the like made within the spirit and principle of the present disclosure shall be included in the scope of protection of the present disclosure.

Claims

CLAIM 1. A method of optical transmission amplification, suitable for use in a potassium-doped fiber amplifier, the method comprising: If it is monitored that the received input optical signal meets the failure criterion, the input optical signal is blocked on a transmission link in the potassium-doped fiber amplifier to isolate an output unit from the input optical signal in the potassium-doped fiber amplifier; a desired output power is determined for the potassium-doped fiber amplifier; and the output unit is controlled to generate an output optical signal according to the desired output power during the failure period.

2. The method of claim 1, wherein, The input optical signal is blocked on the transmission link in the potassium-doped fiber amplifier, including: adjusting a target device preselected on the transmission link to a target state to block the input optical signal by the target device.

3. The method of claim 2, wherein, The target device preselected on the transmission link is adjusted to the target state, including: if the target device includes a light-adjustable attenuator, the light-adjustable attenuator is controlled to switch to an isolation state to block the input optical signal; and if the target device includes an optical switch, the optical switch is controlled to switch to a preset gear to block the input optical signal.

4. The method according to claim 2 or 3, wherein, The potassium-doped fiber amplifier is additionally provided with a special unit, and a target optical switch is additionally provided on the transmission link as the target device; the target optical switch includes a first gear for conducting the transmission link, and a second gear for conducting the special unit and a link part of the transmission link located after the target optical switch; and the special unit constitutes the output unit when the target optical switch switches to the second gear.

5. The method of claim 4, wherein, If no new component is additionally provided in the potassium-doped fiber amplifier, the link part of the transmission link still conducting an output end constitutes the output unit when the target device in the potassium-doped fiber amplifier is adjusted to the target state.

6. The method of claim 1, wherein, The desired output power is determined, including: obtaining an output power of the potassium-doped fiber amplifier before the failure is monitored as the desired output power; or, setting an output power pre-set for the output unit as the desired output power; or, calculating the desired output power based on a pre-set power spectral density for the output unit.

7. The method of claim 1, wherein, The output unit includes a potassium-doped fiber, and the output unit is controlled to generate an output optical signal according to the desired output power, including: adjusting a pump power applied to the potassium-doped fiber included in the output unit to make the output unit generate an output optical signal meeting the desired output power. The pump power applied to the potassium-doped fiber included in the output unit is adjusted, including: sending a control instruction to a pump laser used by the output unit according to a pump setting parameter recorded for the output unit to control the pump laser to adjust the pump power applied to the potassium-doped fiber included in the output unit; and the pump setting parameter is calculated based on the desired output power.

8. The method according to claim 7, wherein, ​ 9. The method of claim 8, further comprising: based on a difference between the output power detected by the output detector in the potassium-doped fiber amplifier and the expected output power, performing feedback adjustment on the pump laser until the output optical signal generated by the output unit meets the expected output power detected by the output detector; recording the pump setting parameter obtained after the feedback adjustment is completed as the pump setting parameter corresponding to the output unit.

10. The method of claim 1, further comprising: If it is monitored that the received input optical signal no longer meets the failure standard, unblocking the input optical signal; and restoring the pump laser required to be used by the transmission link to the pump power before the failure, so as to restore the potassium-doped fiber amplifier to amplify the input optical signal.

11. The method according to claim 10, wherein, The unblocking of the input optical signal comprises: restoring the target device used to block the input optical signal on the transmission link from a target state to a state before the adjustment, so as to unblock the input optical signal; wherein, after it is monitored that the received input optical signal meets the failure standard, the target device has been adjusted to the target state to block the input optical signal.

12. The method according to claim 10, wherein, The unblocking of the input optical signal and the restoring of the pump laser required to be used by the transmission link to the state before the failure are synchronously completed.

13. A potassium-doped fiber amplifier comprising a control assembly and a transmission link, wherein, The control component is configured to execute one or more computer instructions for performing the optical transmission amplification method of any one of claims 1-12.

14. A computer-readable storage medium storing a computer program, wherein, The computer program, when executed by one or more processors, causes the one or more processors to perform the optical transmission amplification method of any one of claims 1-12.

15. A computer program product comprising a computer program, wherein, The computer program, when executed by one or more processors, causes the one or more processors to perform the optical transmission amplification method of any one of claims 1-12. ​

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