EDFA optical safety protection method, system and device

Abstract

The invention discloses an EDFA optical safety protection method, system and device. The method comprises the following steps: controlling a working mode of a first-stage EDFA according to first input optical power, a first gain setting value and first threshold power of the first-stage EDFA; and comparing the output optical power of the last-stage EDFA with the optical safety pump closing threshold for at least one time, and controlling the working mode of the last-stage EDFA according to the comparison result. A double optical safety protection mechanism is adopted, and the first optical safety protection can prevent the influence of a high-output optical power signal on a next-stage EDFA; the second light safety protection can prevent the damage of the abnormal high output light power to the whole EDFA system and can limit the high output light power under the abnormal working scene of the EDFA, thereby improving the reliability, stability and safety of the EDFA system.

Description

Technical Field

[0001] The present invention belongs to the field of optical communication, and more specifically, relates to an EDFA optical safety protection method, system and device. Background Art

[0002] Erbium-doped fiber amplifier (EDFA) is a fiber amplifier that uses erbium-doped fiber gain medium and is widely used in optical communications and optical networks. In practical applications, if the input optical power is too high, the performance of EDFA may be degraded or even damaged. If the output optical power is too high, it may damage the next-stage receiving device and may also cause harm to human eyes. In order to protect EDFA from working within the desired power range, optical safety protection can be performed by controlling the output optical power.

[0003] There are two main ways of traditional optical safety protection: 1. Optical control feedback: Using optical control feedback technology, real-time adjustments can be made according to the actual value of the output optical power. By adding an optical power detector at the input or output of the EDFA, the optical power can be monitored in real time, and the gain of the EDFA can be automatically adjusted according to the set threshold. When the output optical power exceeds the set threshold, the power limiting function will automatically reduce the output optical power. 2. Threshold control: The power limiting function of the EDFA is controlled by setting a fixed threshold. When the output optical power exceeds the set threshold, the EDFA will automatically reduce the gain, thereby limiting the increase in the output optical power. This method is relatively simple, but requires manual settings and adjustments during operation.

[0004] In the traditional optical safety protection method, the output optical power is adjusted by adjusting the gain. The adjustment time is too long and the influence of temporary optical jitter cannot be eliminated, resulting in the inability to quickly and accurately control the output optical power to protect the EDFA system. Summary of the invention

[0005] In view of the above defects or improvement needs of the prior art, the present invention provides an EDFA optical safety protection method, system and device, which aims to adopt a double optical safety protection mechanism. The first optical safety protection can prevent the influence of high output optical power signal on the next-level EDFA; the second optical safety protection can prevent abnormally high output optical power from damaging the entire EDFA system and can limit the high output optical power in abnormal working scenarios of EDFA, thereby improving the reliability, stability and safety of the EDFA system, thereby solving the technical problem that the output optical power is adjusted by adjusting the gain, the adjustment time is too long, and the influence of temporary optical jitter cannot be removed, resulting in the inability to quickly and accurately control the output optical power to protect the EDFA system.

[0006] To achieve the above object, according to a first aspect of the present invention, there is provided an EDFA optical safety protection method, comprising:

[0007] Controlling the working mode of the first-stage EDFA according to the first input optical power, the first gain setting value and the first threshold power of the first-stage EDFA;

[0008] The output optical power of the last-stage EDFA is compared with the optical safety pump-off threshold at least once, and the working mode of the last-stage EDFA is controlled according to the comparison result.

[0009] Further, the controlling the working mode of the first-stage EDFA according to the first input optical power, the first gain setting value and the first threshold power of the first-stage EDFA includes:

[0010] Calculate the sum of the first input optical power and the first gain setting value to obtain a power prediction value; if the power prediction value is greater than the first threshold power, control the optical power output by the first-stage EDFA to be the first threshold power; if the power prediction value is less than or equal to the first threshold power, control the EDFA to operate in normal mode.

[0011] Furthermore, the output optical power of the last stage EDFA is compared with the optical safety pump-off threshold at least once, and the working mode of the last stage EDFA is controlled according to the comparison result, including:

[0012] Comparing the output optical power with the optical safety pump shut-off threshold;

[0013] If the output optical power is greater than the optical safety pump-off threshold, the comparison is continued. After a preset number of comparisons, if the output optical power is still greater than the optical safety pump-off threshold, the last-stage EDFA is regulated. If the output optical power can be made less than the second threshold power within a preset time, the output optical power is controlled to be the second threshold power, otherwise the optical safety pump-off mode is entered;

[0014] If the output optical power is less than the optical safety pump-off threshold, the output optical power is compared with the second threshold power, and the working mode of the last-stage EDFA is controlled according to the comparison result.

[0015] Furthermore, comparing the output optical power with the second threshold power and controlling the working mode of the last stage EDFA according to the comparison result includes:

[0016] If the output optical power is greater than the second threshold power, setting the output optical power of the last-stage EDFA to the second threshold power;

[0017] If the output optical power is less than or equal to the second threshold power, the current of the last-stage EDFA is controlled so that the current of the last-stage EDFA meets the requirement.

[0018] Furthermore, the controlling the current of the last stage EDFA so that the current of the last stage EDFA meets the requirement includes:

[0019] The actual pump current of the last EDFA is obtained. If the actual pump current exceeds the maximum current limit value and lasts for longer than a preset time, the last EDFA is controlled to operate in a current limit mode; otherwise, the last EDFA is controlled to operate in a normal mode.

[0020] Further, controlling the last stage EDFA to operate in a current limiting mode includes:

[0021] Reducing the current of the last-stage EDFA so that the actual pump current does not exceed the maximum current limit;

[0022] When the output optical power of the last-stage EDFA exceeds a set target value and the duration exceeds a preset time, the last-stage EDFA is controlled to operate in a normal mode.

[0023] Furthermore, the EDFA optical safety protection method further comprises: controlling the working mode of each stage of EDFA according to the input optical power, gain setting value and threshold power of each stage of EDFA.

[0024] According to a second aspect of the present invention, an EDFA system is provided, and optical safety protection is performed on the EDFA system according to the EDFA optical safety protection method according to the first aspect, and the EDFA system comprises: a multi-stage cascaded EDFA, a first detector, a second detector and a controller, wherein the first detector is arranged at the input end of the first stage EDFA, the second detector is arranged at the output end of the last stage EDFA, and the controller is connected to the first detector and the second detector;

[0025] The first detector is used to obtain the first input optical power of the first stage EDFA; the second detector is used to obtain the output optical power of the last stage EDFA;

[0026] The controller is used to control the working mode of the first-stage EDFA according to the first input optical power, the first gain setting value and the first threshold power of the first-stage EDFA; the controller is also used to compare the output optical power of the last-stage EDFA with the optical safety pump-off threshold at least once, and control the working mode of the last-stage EDFA according to the comparison result.

[0027] According to the third aspect of the present invention, there is provided an EDFA optical safety protection device, comprising at least one processor and a memory, wherein the at least one processor and the memory are connected via a data bus, and the memory stores instructions executable by the at least one processor, and after being executed by the processor, the instructions are used to complete the EDFA optical safety protection method described in the first aspect.

[0028] According to a fourth aspect of the present invention, a non-volatile computer storage medium is provided, wherein the computer storage medium stores computer executable instructions, and the computer executable instructions are executed by one or more processors to implement the EDFA optical safety protection method described in the first aspect.

[0029] In general, the above technical scheme conceived by the present invention has the following beneficial effects compared with the prior art: the present invention adopts a dual optical safety protection mechanism. The first optical safety protection can prevent the influence of high output optical power signal on the next-level EDFA; the second optical safety protection can prevent abnormally high output optical power from damaging the entire EDFA system and can limit the high output optical power in abnormal working scenarios of EDFA, thereby improving the reliability, stability and safety of the EDFA system. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural schematic diagram of an EDFA system provided by an embodiment of the present invention;

[0031] Figure 2 is a structural schematic diagram of another EDFA system provided by an embodiment of the present invention;

[0032] Figure 3 is a structural diagram of another EDFA system provided by an embodiment of the present invention;

[0033] Figure 4 It is a flow chart of an EDFA optical safety protection method provided by an embodiment of the present invention;

[0034] Figure 5 The embodiment of the present invention provides Figure 4 Schematic diagram of the process of step 101;

[0035] Figure 6 The embodiment of the present invention provides Figure 4 Schematic diagram of the process of step 102;

[0036] Figure 7 It is a schematic diagram of the structure of an EDFA optical safety protection device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0038] Unless the context requires otherwise, throughout the specification and claims, the term "including" is to be interpreted as open inclusion, that is, "including, but not limited to". In the description of the specification, the terms "one embodiment", "some embodiments", "exemplary embodiments", "examples", "specific examples" or "some examples" and the like are intended to indicate that specific features, structures, materials or characteristics associated with the embodiment or example are included in at least one embodiment or example of the present disclosure. The schematic representation of the above terms does not necessarily refer to the same embodiment or example. In addition, the specific features, structures, materials or characteristics may be included in any one or more embodiments or examples in any appropriate manner, that is, although they may be carried in the embodiments or examples of the above terms due to reasons such as the order and position of appearance, it is not limited to that they can be carried in combination by one embodiment or example.

[0039] In the description of the present invention, the terms "first" and "second" are used only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present disclosure, unless otherwise specified, the meaning of "multiple" is two or more. In addition, for example, the same type of nouns may be described as two independent individuals by adding "A" and "B" at the end. In this case, the corresponding features defined as "A" and "B" are only used to distinguish the same type of individuals for description purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features.

[0040] In the description of the present invention, the expression "A and / or B" (where A and B are used to formally represent specific characteristic contents) will be involved, and the corresponding expressions include the following three combinations: only A, only B, and a combination of A and B.

[0041] As used herein, "about," "substantially," or "approximately" includes the stated value and an average value that is within an acceptable range of deviation from the particular value as determined by one of ordinary skill in the art taking into account the measurements in question and the errors associated with the measurement of the particular quantity (i.e., the limitations of the measurement system).

[0042] In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0043] Embodiment 1:

[0044] This embodiment provides an EDFA system. Figure 1 The EDFA system includes: multiple levels of cascaded EDFAs, a first safety threshold check and a second safety threshold check, wherein the first safety threshold check is set on the first-level EDFA side, and the second safety threshold check is set on the last-level EDFA side. The first safety threshold check can prevent the high output optical power signal from affecting the next-level EDFA; the second safety threshold check can prevent the abnormally high output optical power from damaging the entire EDFA system and can limit the high output optical power in abnormal working scenarios of the EDFA, thereby improving the reliability, stability and safety of the EDFA system.

[0045] See also Figure 2 The EDFA system includes: a multi-stage cascaded EDFA, a first detector, a second detector and a controller, wherein the first detector is arranged at the input end of the first-stage EDFA, the second detector is arranged at the output end of the last-stage EDFA, and the controller is connected to the first detector and the second detector; the first detector is used to obtain the first input optical power of the first-stage EDFA; the second detector is used to obtain the output optical power of the last-stage EDFA; the controller is used to control the working mode of the first-stage EDFA according to the first input optical power of the first-stage EDFA, the first gain setting value and the first threshold power; the controller is also used to compare the output optical power of the last-stage EDFA with the optical safety pump-off threshold at least once, and control the working mode of the last-stage EDFA according to the comparison result.

[0046] The EDFA optical safety protection method of the EDFA system is described in the following embodiment.

[0047] Embodiment 2:

[0048] For an EDFA system composed of multiple EDFAs, when the EDFA of the previous stage works in normal mode and amplifies the optical signal, the optical signal may be over-amplified, resulting in excessive input optical power to the next stage EDFA. If this problem is not discovered in time, the EDFA system may be damaged. To solve this problem, refer to Figure 3 A first detector is provided at the input end of each stage of EDFA, and the first detector is used to obtain the input optical power received by the EDFA of this stage. Each stage of EDFA is provided with a corresponding threshold power and gain setting value to avoid excessive input optical power.

[0049] In actual use, the working mode of each EDFA is controlled according to the input optical power, gain setting value and threshold power of each EDFA. Specifically, the sum of the input optical power and the corresponding gain setting value is calculated to obtain the power prediction value; if the power prediction value is greater than the corresponding threshold power, the optical power output by the EDFA of this level is controlled to be the threshold power; if the power prediction value is less than or equal to the threshold power, the EDFA is controlled to work in normal mode. This can prevent the influence of high output optical power signals on the next EDFA.

[0050] Embodiment 3:

[0051] Based on the EDFA system provided in the above embodiment, refer to Figure 4 This embodiment provides an EDFA optical security protection method, including:

[0052] Step 101: Control the working mode of the first-stage EDFA according to the first input optical power, the first gain setting value and the first threshold power of the first-stage EDFA.

[0053] The first-stage EDFA has two working modes: normal mode and automatic power control (APC) mode. In normal mode, the first-stage EDFA amplifies the optical signal according to the set gain; in APC mode, the first-stage EDFA outputs an optical signal with a fixed power.

[0054] The first gain setting value and the first threshold power are selected according to actual conditions and are not specifically limited in this embodiment. The optical signal of the first threshold power will not affect the next stage EDFA.

[0055] Step 102: Compare the output optical power of the last-stage EDFA with the optical safety pump-off threshold at least once, and control the working mode of the last-stage EDFA according to the comparison result.

[0056] Among them, the optical safety pump shutdown threshold is determined according to the actual situation to ensure that the output optical signal will not affect the system.

[0057] The working modes of the last EDFA include normal mode, APC mode, current limiting mode and optical safety pump-off mode. The normal mode and APC mode are the same as those mentioned above and will not be described here. The current limiting mode means that the pump current is less than the set value; the safety pump-off mode means that the pump is directly turned off when the optical power is too large.

[0058] The present invention adopts a double optical safety protection mechanism. The first optical safety protection can prevent the influence of high output optical power signal on the next-level EDFA; the second optical safety protection can prevent abnormally high output optical power from damaging the entire EDFA system and can limit the high output optical power in abnormal working scenarios of EDFA, thereby improving the reliability, stability and safety of the EDFA system.

[0059] In one embodiment, the aforementioned step 101 includes:

[0060] Step 201: Calculate the sum of the first input optical power and the first gain setting value to obtain a power prediction value.

[0061] Step 202: If the power prediction value is greater than the first threshold power, the optical power output by the first-stage EDFA is controlled to be the first threshold power.

[0062] Step 203: If the power prediction value is less than or equal to the first threshold power, the EDFA is controlled to operate in a normal mode.

[0063] In this embodiment, an optical power detector is added to the input end of the first-stage EDFA to monitor the input optical power in real time. A first optical safety threshold is set at the output end of the first-stage EDFA. If the sum of the first input optical power (Input power, hereinafter referred to as Pin) + the first gain setting value (hereinafter referred to as Gainset) exceeds the set first threshold power (hereinafter referred to as Plimit1) (i.e., Pin+Gainset>Plimit1), the first-stage EDFA will automatically switch to the APC mode, set the output optical power (Output power, hereinafter referred to as Pout) equal to Plimit1, and work at the set Plimit1 to prevent abnormal high output optical power from affecting the next-stage EDFA.

[0064] Plimit threshold protection can prevent the impact of high output optical power signals on EDFA in advance. Since it is a logical judgment made through Pin+Gainset and Plimit1, rather than Pin+Gainsample (Gainsample refers to the actual sampled value of Gain, which is a feedback quantity. It is the actual gain value sampled back through the feedback circuit after EDFA sets Gainset), this protection method has the function of early prediction and is a pure feedforward method. It does not need to wait until the set value Gainset takes effect before obtaining Gainsample, so it has better effectiveness and interception.

[0065] In this embodiment, a second optical safety threshold is set at the output end of the entire EDFA system (i.e., the last stage EDFA). The second optical safety threshold is for the system's dynamic change scenarios (wavelength switching, mode switching, power switching, gain switching, etc.) and optical path abnormality scenarios. The actual output optical power is directly monitored, and the output optical power and the optical safety pump-off threshold are compared multiple times within a certain period of time. This comparison time is configurable. If the output optical power is still greater than the optical safety pump-off threshold, the last stage EDFA is regulated. If the module outputs optical power that is still greater than the optical safety pump-off threshold within 100ms (it can also be other values, which are not specifically limited here), the module enters the optical safety pump-off mode. Figure 5 , step 102 specifically includes:

[0066] Step 301: Compare the output optical power with the optical safety pump-off threshold.

[0067] Step 302: If the output optical power is greater than the optical safety pump-off threshold, continue to compare. After a preset number of comparisons, if the output optical power is still greater than the optical safety pump-off threshold, the last-stage EDFA is regulated. If the output optical power can be made less than the second threshold power within a preset time, the output optical power is controlled to be the second threshold power. Otherwise, the optical safety pump-off mode is entered.

[0068] The preset number of times may be determined according to actual conditions and is not specifically limited here. For example, the preset number of times is 100 times. The preset time may be determined according to actual conditions and is not specifically limited here. For example, the preset time may be 100 ms.

[0069] Since the output optical power is obtained through a sampling circuit, after multiple comparisons, temporary optical jitter, noise interference and other factors are removed.

[0070] Step 303: If the output optical power is less than the optical safety pump-off threshold, the output optical power is compared with the second threshold power, and the working mode of the last stage EDFA is controlled according to the comparison result.

[0071] In one embodiment, the comparing the output optical power with the second threshold power in step 303 and controlling the working mode of the last stage EDFA according to the comparison result includes:

[0072] If the output optical power is greater than the second threshold power, the output optical power of the last-stage EDFA is set to the second threshold power; if the output optical power is less than or equal to the second threshold power, the current of the last-stage EDFA is controlled so that the current of the last-stage EDFA meets the requirements.

[0073] The second threshold power may be determined according to circumstances and is not specifically limited here.

[0074] In this embodiment, if the output optical power is less than the optical safety pump shut-off threshold, it is further determined whether the output optical power is greater than the second threshold power. If it is, the last-stage EDFA will automatically switch to APC mode, set the output optical power equal to the second threshold power, and operate at the set second threshold power.

[0075] In one embodiment, if the output optical power is less than or equal to the second threshold power, the actual pump current of the last-stage EDFA is obtained; if the actual pump current exceeds the maximum current limiting value and lasts for more than a preset time, the last-stage EDFA is controlled to operate in a current limiting mode; otherwise, the last-stage EDFA is controlled to operate in a normal mode.

[0076] In one embodiment, controlling the last-stage EDFA to operate in a current limiting mode includes: reducing the current of the last-stage EDFA so that the actual pump current does not exceed the maximum current limiting value; wherein, when the output optical power of the last-stage EDFA exceeds a set target value and the duration exceeds a preset time, controlling the last-stage EDFA to operate in a normal mode.

[0077] Among them, the preset time and the maximum current limit value can be determined according to actual conditions and are not specifically limited in this embodiment.

[0078] In one embodiment, if the output optical power is less than or equal to the second threshold power, the EDFA system enters the ACC current limiting mode. If the EDFA pump current exceeds the maximum current and can last for more than 200ms, the EDFA enters the ACC current limiting mode, otherwise it enters the normal mode.

[0079] In one embodiment, when the pump current is less than the maximum current limit, it is continued to determine whether the output optical power of the EDFA can exceed the set target value + 0.5dB for 100ms. If it exceeds, the EDFA enters the normal mode, otherwise it continues to run the ACC current limit mode. The ACC current limit mode is for the working scenario where the input and output detection of the EDFA is abnormal. The EDFA limits its abnormally high output optical power by running the ACC current limit mode.

[0080] For an EDFA system composed of multiple EDFAs, when the EDFA of the previous stage works in normal mode and amplifies the optical signal, the optical signal may be over-amplified, resulting in excessive input optical power to the next stage EDFA. If this problem cannot be discovered in time, the EDFA system may be damaged. A first detector is provided at the input end of each stage EDFA, and the first detector is used to obtain the input optical power received by the EDFA of this stage. Each stage EDFA is provided with a corresponding threshold power and gain setting value to avoid excessive input optical power.

[0081] In actual use, the working mode of each EDFA is controlled according to the input optical power, gain setting value and threshold power of each EDFA. Specifically, the sum of the input optical power and the corresponding gain setting value is calculated to obtain the power prediction value; if the power prediction value is greater than the corresponding threshold power, the optical power output by the EDFA of this level is controlled to be the threshold power; if the power prediction value is less than or equal to the threshold power, the EDFA is controlled to work in normal mode. This can prevent the influence of high output optical power signals on the next EDFA.

[0082] Embodiment 4:

[0083] Based on the EDFA optical safety protection method of the above embodiment, this embodiment provides a specific example, and the solution includes the following steps:

[0084] The first level of security protection mechanism process (i.e., the first level of security threshold check, corresponding to step 101 of embodiment 2):

[0085] Step 1: Sample and obtain the input and output optical powers of the first-stage EDFA.

[0086] Step 2: Plimit power threshold protection.

[0087] Step 2.1: Compare the first input optical power, the first gain setting value, and the first threshold power.

[0088] Step 2.2: If the sum of the first input optical power and the first gain setting value is greater than the first threshold power, the EDFA is switched to the APC mode, and the target power is set to the first threshold power.

[0089] Step 2.3: If the sum of the first input optical power and the first gain setting value is less than or equal to the first threshold power, the first-stage EDFA enters normal mode control.

[0090] Second level security protection mechanism process (i.e., second level security threshold check, corresponding to step 102 of embodiment 2):

[0091] Step 1: Sample and obtain the output optical power and pump current of the EDFA system.

[0092] Step 2: EDFA optical safety threshold protection.

[0093] Step 2.1: Compare the sampled output optical power with the set optical safety pump shut-off threshold;

[0094] Step 2.2: Repeat the comparison operation in step 2.1 for 100 times. The number of comparison times can be set according to your needs. By performing multiple comparisons, temporary optical jitter and noise interference caused by wavelength switching, mode switching, power switching, gain switching, etc. can be eliminated.

[0095] Step 2.3: After multiple comparisons, if the output optical power is still greater than the optical safety pump-off threshold, the last-stage EDFA is regulated. If the output optical power can be made less than the second threshold power within the preset time, the output optical power is controlled to be the second threshold power, otherwise the optical safety pump-off mode is entered.

[0096] Step 2.4: If the output optical power is less than the optical safety pump shutdown threshold, the module enters the Plimit power threshold judgment.

[0097] Step 3: Plimit power threshold protection.

[0098] Step 3.1: Compare the output optical power with the set Plimit optical power threshold (ie, the second threshold power).

[0099] Step 3.2: If it is greater than the Plimit optical power threshold, switch the EDFA to APC mode and set the target power to the Plimit optical power threshold for control.

[0100] Step 3.3: If it is less than the Plimit optical power threshold, the EDFA enters the ACC current limiting judgment.

[0101] Step 4: ACC current threshold protection.

[0102] Step 4.1: If the pump current exceeds Imax (i.e., the maximum current limit value) for more than 200ms, the module enters the ACC current limit mode, otherwise it enters the normal mode control.

[0103] Step 4.2: When the output power in ACC current limiting mode exceeds the set target value + 0.5dB for more than 100ms, the module exits ACC current limiting mode and enters normal mode control, otherwise it continues to operate in ACC current limiting mode.

[0104] Step 5: Repeat steps 1 to 4 above to cyclically monitor the EDFA system to implement laser safety protection.

[0105] Embodiment 5:

[0106] Based on the EDFA optical safety protection method provided in the above-mentioned embodiments 3 and 4, the present invention also provides an EDFA optical safety protection device, such as Figure 7 , which is a schematic diagram of the device architecture of an embodiment of the present invention. The device of this embodiment includes one or more processors 21 and a memory 22. Figure 7 A processor 21 is taken as an example.

[0107] The processor 21 and the memory 22 may be connected via a bus or other means. Figure 7 The example of connecting through bus is taken in the following.

[0108] The memory 22 is a non-volatile computer-readable storage medium of an EDFA optical safety protection method, and can be used to store non-volatile software programs, non-volatile computer executable programs and modules, such as the EDFA optical safety protection method in Example 1. The processor 21 executes various functional applications and data processing of the device by running the non-volatile software programs, instructions and modules stored in the memory 22, that is, implementing the EDFA optical safety protection method of the embodiment.

[0109] The memory 22 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other non-volatile solid-state storage devices. In some embodiments, the memory 22 may optionally include a memory remotely arranged relative to the processor 21, and these remote memories may be connected to the processor 21 via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0110] The program instructions / modules are stored in the memory 22, and when executed by the one or more processors 21, the EDFA optical safety protection method in the above embodiment is executed.

[0111] A person skilled in the art may understand that all or part of the steps in the various methods of the embodiments may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, and the storage medium may include: a read-only memory (ROM), a random access memory (RAM), a disk or an optical disk, etc.

[0112] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An EDFA optical safety protection method, characterized in that: include: Controlling the working mode of the first-stage EDFA according to the first input optical power, the first gain setting value and the first threshold power of the first-stage EDFA; The output optical power of the last-stage EDFA is compared with the optical safety pump-off threshold at least once, and the working mode of the last-stage EDFA is controlled according to the comparison result.

2. The EDFA optical safety protection method according to claim 1, characterized in that: The operation mode of controlling the first-stage EDFA according to the first input optical power, the first gain setting value and the first threshold power of the first-stage EDFA includes: Calculate the sum of the first input optical power and the first gain setting value to obtain a power prediction value; if the power prediction value is greater than the first threshold power, control the optical power output by the first-stage EDFA to be the first threshold power; if the power prediction value is less than or equal to the first threshold power, control the EDFA to operate in normal mode.

3. The EDFA optical safety protection method according to claim 1, characterized in that: The comparing the output optical power of the last stage EDFA with the optical safety pump-off threshold at least once and controlling the working mode of the last stage EDFA according to the comparison result comprises: Comparing the output optical power with the optical safety pump shut-off threshold; If the output optical power is greater than the optical safety pump-off threshold, the comparison is continued. After a preset number of comparisons, if the output optical power is still greater than the optical safety pump-off threshold, the last-stage EDFA is regulated. If the output optical power can be made less than the second threshold power within a preset time, the output optical power is controlled to be the second threshold power, otherwise the optical safety pump-off mode is entered; If the output optical power is less than the optical safety pump-off threshold, the output optical power is compared with the second threshold power, and the working mode of the last-stage EDFA is controlled according to the comparison result.

4. The EDFA optical safety protection method according to claim 3, characterized in that: The comparing the output optical power with the second threshold power and controlling the working mode of the last stage EDFA according to the comparison result comprises: If the output optical power is greater than the second threshold power, setting the output optical power of the last-stage EDFA to the second threshold power; If the output optical power is less than or equal to the second threshold power, the current of the last-stage EDFA is controlled so that the current of the last-stage EDFA meets the requirement.

5. The EDFA optical safety protection method according to claim 4, characterized in that: The controlling the current of the last-stage EDFA so that the current of the last-stage EDFA meets the requirement includes: The actual pump current of the last EDFA is obtained. If the actual pump current exceeds the maximum current limit value and lasts for longer than a preset time, the last EDFA is controlled to operate in a current limit mode; otherwise, the last EDFA is controlled to operate in a normal mode.

6. The EDFA optical safety protection method according to claim 5, characterized in that: The controlling the last stage EDFA to operate in a current limiting mode comprises: Reducing the current of the last-stage EDFA so that the actual pump current does not exceed the maximum current limit; When the output optical power of the last-stage EDFA exceeds a set target value and the duration exceeds a preset time, the last-stage EDFA is controlled to operate in a normal mode.

7. The EDFA optical safety protection method according to claim 1, characterized in that: The EDFA optical safety protection method further comprises: controlling the working mode of each stage of EDFA according to the input optical power, gain setting value and threshold power of each stage of EDFA.

8. An EDFA system, characterized in that: The EDFA system is subjected to optical safety protection according to the EDFA optical safety protection method according to any one of claims 1 to 7, wherein the EDFA system comprises: a multi-stage cascaded EDFA, a first detector, a second detector and a controller, wherein the first detector is arranged at the input end of the first stage EDFA, the second detector is arranged at the output end of the last stage EDFA, and the controller is connected to the first detector and the second detector; The first detector is used to obtain the first input optical power of the first stage EDFA; the second detector is used to obtain the output optical power of the last stage EDFA; The controller is used to control the working mode of the first-stage EDFA according to the first input optical power, the first gain setting value and the first threshold power of the first-stage EDFA; the controller is also used to compare the output optical power of the last-stage EDFA with the optical safety pump-off threshold at least once, and control the working mode of the last-stage EDFA according to the comparison result.

9. An EDFA optical safety protection device, characterized in that: It includes at least one processor and a memory, wherein the at least one processor and the memory are connected via a data bus, and the memory stores instructions that can be executed by the at least one processor, and after being executed by the processor, the instructions are used to complete the EDFA optical safety protection method described in any one of claims 1-7.

10. A non-volatile computer storage medium, characterized in that: The computer storage medium stores computer executable instructions, which are executed by one or more processors to implement the EDFA optical safety protection method according to any one of claims 1 to 7.

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