阅读说明：本技术 针对光纤放大器进行脉冲能量控制的系统、方法、装置、处理器及其计算机可读存储介质 (System, method, apparatus, processor and computer readable storage medium for pulse energy control for fiber amplifier ) 是由 张涛 陈锋华 于 2021-09-16 设计创作，主要内容包括：本发明涉及一种针对光纤放大器进行脉冲能量控制的系统,其中,该系统包括：输入光耦合器,用于将输入光脉冲信号输入至系统进行能量检测；光纤放大模块,用于对输入光脉冲信号进行信号放大处理；输出光耦合器,用于对放大后的输入光脉冲信号进行分路处理；能量检测模块,用于检测输出光脉冲信号的输出脉冲能量；以及控制检测子系统,用于根据光纤信号的输入检测和能量检测结果,进行增益控制的实时调整。本发明还涉及一种相应的方法、装置、处理器及其存储介质。采用了本发明的该系统、方法、装置、处理器及其存储介质,使得脉冲输出稳定时间缩短到分钟,且过程中不受环境变化影响,使系统工作准备时间缩短了百倍,系统脉冲稳定性提高了数十倍。(The invention relates to a system for pulse energy control for a fiber amplifier, wherein the system comprises: the input optical coupler is used for inputting an input optical pulse signal to a system for energy detection; the optical fiber amplification module is used for carrying out signal amplification processing on the input optical pulse signal; the output optical coupler is used for carrying out shunt processing on the amplified input optical pulse signals; the energy detection module is used for detecting the output pulse energy of the output optical pulse signal; and the control detection subsystem is used for carrying out real-time adjustment of gain control according to the input detection and energy detection results of the optical fiber signals. The invention also relates to a corresponding method, device, processor and storage medium thereof. By adopting the system, the method, the device, the processor and the storage medium thereof, the pulse output stabilization time is shortened to minutes, and the process is not influenced by environmental change, so that the system work preparation time is shortened by hundreds of times, and the system pulse stability is improved by tens of times.)

1. A system for pulse energy control for a fiber amplifier, the system comprising:

the input optical coupler is used for inputting an input optical pulse signal to a system for energy detection;

the optical fiber amplification module is connected with the input optical coupler and is used for carrying out signal amplification processing on the input optical pulse signal;

the output optical coupler is connected with the optical fiber amplification module and is used for carrying out shunt processing on the amplified input optical pulse signal;

the energy detection module is connected with the output optical coupler and used for detecting the output pulse energy of the output optical pulse signal; and

and the control detection subsystem is connected with the input optical coupler and the output optical coupler and is used for carrying out real-time adjustment of gain control according to the input detection and energy detection results of optical fiber signals.

2. The system of claim 1, wherein the system comprises the following processes:

(a) the energy detection module judges whether the output pulse energy detected currently is lower than a system preset light pulse energy value, if so, the processing procedure (2) is carried out, otherwise, the processing procedure (3) is carried out;

(b) the control detection subsystem automatically increases amplifier gain for the optical fiber amplification module until the output pulse energy is equal to the system preset optical pulse energy value, and enters a processing process (4);

(c) the control detection subsystem automatically reduces the gain of the amplifier for the optical fiber amplification module until the output pulse energy is equal to the system preset optical pulse energy value, and enters a processing process (4);

(d) the output pulse energy is constant, and the constant output control of the optical fiber amplifier is completed.

3. A method for implementing pulse energy control for an optical fiber amplifier based on the system of claim 1, the method comprising the steps of:

(1) inputting the optical pulse signal;

(2) carrying out signal amplification processing on the optical pulse signal;

(3) carrying out energy detection on the output pulse energy of the amplified optical pulse signal;

(4) and performing gain control on the optical pulse signal to realize constant output of the output pulse energy of the optical fiber amplifier.

4. The method for implementing pulse energy control for an optical fiber amplifier according to claim 3, wherein the step (3) specifically comprises the following steps:

(3.1) the energy detection module judges whether the currently detected output pulse energy is lower than a system preset light pulse energy value, if so, the step (3.2) is carried out, and if not, the step (3.3) is carried out;

(3.2) the control detection subsystem automatically increases amplifier gain for the optical fiber amplification module until the output pulse energy is equal to the system preset optical pulse energy value;

(3.3) the control detection subsystem automatically reduces the gain of the amplifier for the optical fiber amplification module until the output pulse energy is equal to the system preset optical pulse energy value.

5. An apparatus for implementing pulse energy control for a fiber amplifier, the apparatus comprising:

a processor configured to execute computer-executable instructions;

a memory storing one or more computer-executable instructions that, when executed by the processor, perform the steps of the method for pulse energy control for an optical fiber amplifier of any of claims 3 to 4.

6. A processor for implementing pulse energy control for an optical fiber amplifier, wherein the processor is configured to execute computer-executable instructions which, when executed by the processor, implement the steps of the method for pulse energy control for an optical fiber amplifier according to any one of claims 3 to 4.

7. A computer-readable storage medium, having stored thereon a computer program executable by a processor for carrying out the steps of the method for pulse energy control for an optical fiber amplifier according to any one of claims 3 to 4.

Technical Field

The present invention relates to the field of optoelectronic signal processing technologies, and in particular, to a system, a method, an apparatus, a processor, and a computer-readable storage medium for controlling pulse energy for an optical fiber amplifier.

Background

The conventional optical fiber amplifier EDFA/YDFA generally has three control modes:

1. automatic Power control mode (APC)

The APC, Auto Power Control, automatic Power Control or constant Power mode, means that no matter how the input Power Pi changes, the mode adjusts the gain of the amplifier in real time by detecting the output Power Po, so as to ensure the constancy of the output Power Po. As shown in fig. 1, Po ═ Pi + Gain.

For example, when the input power Pi decreases due to line attenuation or system aging, the control system detects the Po decrease, and the system automatically increases the Gain, usually by increasing the Pump power, so that the output power remains constant, as expressed by the following equation:

Po＝Pi-△Pi+Gain+△Gain＝Constant

generally, in a single-channel optical fiber communication system, such as a CATV optical transmission system and an SDH optical transmission system, an APC control system is adopted for an optical fiber amplifier to ensure the stability of the communication system.

2. Automatic gain control mode (AGC)

The AGC, automatic Gain Control or constant Gain mode, means that no matter how the input power Pi changes, the mode adjusts the Pump laser current and the built-in VOA (adjustable attenuator) in the amplifier in real time by detecting the input power Pi and the output power Po to ensure the Gain of the amplifier to be constant. As shown in fig. 2, Gain-Po-Pi.

For example, when the input power Pi decreases due to line attenuation or system aging, and the control system detects a Gain change (usually, the Gain increases when the input power decreases and the control system is inconvenient), the system automatically decreases the Gain, usually by decreasing the Pump power or increasing the attenuation of the internal VOA, so that the Gain remains constant, as expressed by the following equation:

Gain＝Po-Pi＝Constant

in general, in a DWDM multi-channel optical fiber communication system, an AGC control system is adopted in an optical fiber amplifier to ensure the stability of the communication system.

3. Automatic current control mode (ACC)

ACC, Auto Current Control, or constant Power mode, means that no matter how the input Power Pi changes, the output Power changes, and the mode only ensures the constant of the Pump drive Current, i.e. the constant of the Pump excitation function under certain conditions. As shown in fig. 3, the decision of the control system in this control mode does not refer to any change in input-output power, but merely keeps the Pump drive current constant.

Generally, in some scientific research systems, researchers hope to take the decision of the whole amplifier to regulate and control the amplifier by themselves. However, if this mode is used for a system that operates automatically for a long period of time, the system will be unstable because there is no automatic feedback mechanism associated with the optical layer.

With the increasing application of fiber amplifiers in some non-communication fields, such as fiber sensing, industrial lasers, laser radars, etc., fiber amplifiers are often required to amplify pulsed light signals, especially low duty cycle high peak power pulse signals, such as fiber sensing DTS signals, laser ranging or laser radar signals, ns-order pulse widths, kHz or below repetition frequencies. The signals of the type have narrow pulse width and low duty ratio, so that the output power cannot be accurately detected by a conventional method, the APC mode cannot be realized, and the ACC mode is always adopted for control relatively carelessly.

The ACC mode can only realize the amplification of the amplifier, but in use, the slow or fast output power change of the system is caused by the input power change, the change of the environment temperature, the attenuation of the line and the aging of the device, and the ACC mode can not adjust the change, which is actually an open loop mode for the amplifier optics, so that the system with higher requirements on pulse amplification precision in the industry can not be used by a good optical fiber amplifier.

Disclosure of Invention

It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and to provide a system, a method, an apparatus, a processor and a computer readable storage medium thereof for pulse energy control for an optical fiber amplifier, which can effectively keep the pulse output stable.

To achieve the above object, the present invention provides a system, method, apparatus, processor and computer readable storage medium for pulse energy control for an optical fiber amplifier, comprising:

the system for controlling the pulse energy aiming at the optical fiber amplifier is mainly characterized by comprising the following components:

the input optical coupler is used for inputting an input optical pulse signal to a system for energy detection;

the optical fiber amplification module is connected with the input optical coupler and is used for carrying out signal amplification processing on the input optical pulse signal;

the output optical coupler is connected with the optical fiber amplification module and is used for carrying out shunt processing on the amplified input optical pulse signal;

the energy detection module is connected with the output optical coupler and used for detecting the output pulse energy of the output optical pulse signal; and

and the control detection subsystem is connected with the input optical coupler and the output optical coupler and is used for carrying out real-time adjustment of gain control according to the input detection and energy detection results of optical fiber signals.

Preferably, the system comprises the following processes:

(a) the energy detection module judges whether the output pulse energy detected currently is lower than a system preset light pulse energy value, if so, the processing procedure (2) is carried out, otherwise, the processing procedure (3) is carried out;

(b) the control detection subsystem automatically increases amplifier gain for the optical fiber amplification module until the output pulse energy is equal to the system preset optical pulse energy value, and enters a processing process (4);

(c) the control detection subsystem automatically reduces the gain of the amplifier for the optical fiber amplification module until the output pulse energy is equal to the system preset optical pulse energy value, and enters a processing process (4);

(d) the output pulse energy is constant, and the constant output control of the optical fiber amplifier is completed.

The method for realizing pulse energy control for the optical fiber amplifier based on the system is mainly characterized by comprising the following steps of:

(1) inputting the optical pulse signal;

(2) carrying out signal amplification processing on the optical pulse signal;

(3) carrying out energy detection on the output pulse energy of the amplified optical pulse signal;

(4) and carrying out constant gain control on the optical pulse signal to realize constant output of the output pulse energy of the optical fiber amplifier.

Preferably, the step (3) specifically includes the following steps:

(3.1) the energy detection module judges whether the currently detected output pulse energy is lower than a system preset light pulse energy value, if so, the step (3.2) is carried out, and if not, the step (3.3) is carried out;

(3.2) the control detection subsystem automatically increases amplifier gain for the optical fiber amplification module until the output pulse energy is equal to the system preset optical pulse energy value;

(3.3) the control detection subsystem automatically reduces the gain of the amplifier for the optical fiber amplification module until the output pulse energy is equal to the system preset optical pulse energy value.

The device for realizing pulse energy control aiming at the optical fiber amplifier is mainly characterized by comprising the following components:

a processor configured to execute computer-executable instructions;

a memory storing one or more computer-executable instructions that, when executed by the processor, perform the steps of the method for pulse energy control for an optical fiber amplifier described above.

The processor for implementing pulse energy control for an optical fiber amplifier is mainly characterized in that the processor is configured to execute computer-executable instructions, and when the computer-executable instructions are executed by the processor, the steps of the method for implementing pulse energy control for an optical fiber amplifier are implemented.

The computer-readable storage medium is primarily characterized in that a computer program is stored thereon, which computer program is executable by a processor for carrying out the steps of the above-described method for pulse energy control for an optical fiber amplifier.

Compared with the prior art, the system, the method, the device, the processor and the computer readable storage medium for controlling the pulse energy of the optical fiber amplifier have the advantages that the splitter is arranged at the output end of the amplifier and connected with the energy detection module, and the pulse energy obtained by the energy detection module is used as a standard to feed back and control the gain of the amplifier. The constant of output light pulse energy is guaranteed no matter under any condition in the automatic energy control mode (AEC mode), the stable pulse output time can be shortened to minutes, and the influence of environmental changes is avoided in the process, so that the work preparation time of the system is shortened by one hundred times, and the pulse stability of the system is improved by tens of times. And the AEC mode is particularly suitable for the pulse amplifier to quickly keep stable output of pulses under the condition of change of ambient temperature, so that the AEC mode is very effective and has a more prominent application effect.

Drawings

Fig. 1 is a schematic diagram of a related art Automatic Power Control (APC) mode.

Fig. 2 is a schematic diagram of a prior art Automatic Gain Control (AGC) mode.

Fig. 3 is a schematic diagram of a structure in an automatic current control mode (ACC) of the related art.

Fig. 4 is a schematic structural view in an automatic energy control mode (AEC) according to the present invention.

Fig. 5 is a schematic diagram of pulse energy integration of energy detection performed by the energy detection module according to the present invention.

Fig. 6 is a diagram illustrating pulse stability detection in an automatic current control mode (ACC) according to the related art.

Fig. 7 is a schematic diagram of pulse stability detection in the automatic energy control mode (AEC) according to the present invention.

Detailed Description

In order to more clearly describe the technical contents of the present invention, the following further description is given in conjunction with specific embodiments.

Before describing in detail embodiments that are in accordance with the present invention, it should be noted that the terms "comprises," "comprising," or any other variation 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 may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Referring to fig. 4, the system for pulse energy control of an optical fiber amplifier includes:

the input optical coupler is used for inputting an input optical pulse signal to a system for energy detection;

the optical fiber amplification module is connected with the input optical coupler and is used for carrying out signal amplification processing on the input optical pulse signal;

the output optical coupler is connected with the optical fiber amplification module and is used for carrying out shunt processing on the amplified input optical pulse signal;

the energy detection module is connected with the output optical coupler and used for detecting the output pulse energy of the output optical pulse signal; and

and the control detection subsystem is connected with the input optical coupler and the output optical coupler and is used for carrying out real-time adjustment of gain control according to the input detection and energy detection results of optical fiber signals.

As a preferred embodiment of the invention, the system comprises the following processing procedures:

(a) the energy detection module judges whether the output pulse energy detected currently is lower than a system preset light pulse energy value, if so, the processing procedure (2) is carried out, otherwise, the processing procedure (3) is carried out;

(b) the control detection subsystem automatically increases amplifier gain for the optical fiber amplification module until the output pulse energy is equal to the system preset optical pulse energy value, and enters a processing process (4);

(c) the control detection subsystem automatically reduces the gain of the amplifier for the optical fiber amplification module until the output pulse energy is equal to the system preset optical pulse energy value, and enters a processing process (4);

(d) the output pulse energy is constant, and the constant output control of the optical fiber amplifier is completed.

The method for realizing pulse energy control for the optical fiber amplifier based on the system comprises the following steps:

(1) inputting the optical pulse signal;

(2) carrying out signal amplification processing on the optical pulse signal;

(3) carrying out energy detection on the output pulse energy of the amplified optical pulse signal;

(4) and carrying out constant gain control on the optical pulse signal to realize constant output of the output pulse energy of the optical fiber amplifier.

As a preferred embodiment of the present invention, the step (3) specifically comprises the following steps:

(3.1) the energy detection module judges whether the currently detected output pulse energy is lower than a system preset light pulse energy value, if so, the step (3.2) is carried out, and if not, the step (3.3) is carried out;

(3.2) the control detection subsystem automatically increases amplifier gain for the optical fiber amplification module until the output pulse energy is equal to the system preset optical pulse energy value;

(3.3) the control detection subsystem automatically reduces the gain of the amplifier for the optical fiber amplification module until the output pulse energy is equal to the system preset optical pulse energy value.

The device for realizing pulse energy control for the optical fiber amplifier comprises:

a processor configured to execute computer-executable instructions;

a memory storing one or more computer-executable instructions that, when executed by the processor, perform the steps of the method for pulse energy control for an optical fiber amplifier described above.

The processor for implementing pulse energy control for an optical fiber amplifier is configured to execute computer-executable instructions, and when the computer-executable instructions are executed by the processor, the steps of the method for implementing pulse energy control for an optical fiber amplifier are implemented.

The computer readable storage medium has stored thereon a computer program executable by a processor to perform the steps of the above-described method for pulse energy control of an optical fiber amplifier.

Referring to fig. 5, the energy detection circuit in the automatic energy control mode (AEC) of the present invention can detect the energy of each amplified pulse or a series of pulses, i.e. perform fast integration on each pulse to obtain the energy of each pulse:

Energy＝∫P(t)dt

then the gain of the amplifier is adjusted in real time by comparing the pulse energy through the control system, and the stability of the output pulse energy is ensured. The pulse width and shape of the pulse are not generally changed for an amplifier, so that the constant energy determines the constancy of the peak power of the output pulse.

In a specific embodiment of the present invention, an input optical pulse signal IS enters an optical fiber amplification module, the amplified signal IS connected to an optical splitter (i.e., an output optical coupler), a part of the split signal enters an energy detection module, the energy detection module IS connected to a control detection subsystem, the control detection subsystem sends a gain control signal GC to the optical fiber amplification module according to the magnitude of energy detection, and the optical fiber amplification module, the output optical coupler, the energy detection module, and the control detection subsystem form closed-loop control according to pulse energy, thereby achieving the stabilization of amplified output pulse energy.

In one embodiment of the present invention, referring to fig. 6 and 7, 1550nm,10ns pulse width, 10kHz repetition frequency, and output about 1uJ of pulse amplification are adopted.

When the conventional ACC mode is adopted, the pulse output requires a settling time of the order of hours due to the long time required for the thermal settling of the apparatus, and is susceptible to the influence of the ambient temperature.

After the AEC is adopted to control the mode amplifier, the stabilization time is shortened to minutes, and the stability is not influenced by environmental changes in the process, so that the work preparation time of the system is shortened by one hundred times, and the pulse stability of the system is improved by tens of times.

The AEC mode is particularly suitable for pulse amplifiers to quickly maintain a stable output of pulses very effective under varying ambient temperatures.

As can be seen from fig. 6, when the light is in the ACC mode, the system needs 2-3 hours to be stable due to the establishment of the thermal balance of the device, and the process is very susceptible to the ambient temperature change. After the energy monitoring and fast feedback are carried out, the system is quickly established to be stable, and long-time stability without being influenced by the external environment is realized.

Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.

It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by suitable instruction execution devices.

It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, and the program may be stored in a computer readable storage medium, and when executed, the program includes one or a combination of the steps of the method embodiments.

In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a separate product, may also be stored in a computer readable storage medium.

The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc.

In the description herein, references to the description of terms "an embodiment," "some embodiments," "an example," "a specific example," or "an embodiment," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Compared with the prior art, the system, the method, the device, the processor and the computer readable storage medium for controlling the pulse energy of the optical fiber amplifier have the advantages that the splitter is arranged at the output end of the amplifier and connected with the energy detection module, and the pulse energy obtained by the energy detection module is used as a standard to feed back and control the gain of the amplifier. The constant of output light pulse energy is guaranteed no matter under any condition in the automatic energy control mode (AEC mode), the stable pulse output time can be shortened to minutes, and the influence of environmental changes is avoided in the process, so that the work preparation time of the system is shortened by one hundred times, and the pulse stability of the system is improved by tens of times. And the AEC mode is particularly suitable for the pulse amplifier to quickly keep stable output of pulses under the condition of change of ambient temperature, so that the AEC mode is very effective and has a more prominent application effect.

In this specification, the invention has been described with reference to specific embodiments thereof. It will, however, be evident that various modifications and changes may be made thereto without departing from the broader spirit and scope of the invention. The specification and drawings are, accordingly, to be regarded in an illustrative rather than a restrictive sense.