Design method and system of erbium-doped optical fiber amplifier with high signal-to-noise ratio

Abstract

The invention provides a design method and system of an erbium-doped optical fiber amplifier with a high signal-to-noise ratio, and relates to the technical field of optical fiber amplifiers, an electrical system and an optical system are connected through a pump laser, and the erbium-doped optical fiber amplifier with the high signal-to-noise ratio is obtained; temperature error control and current supply are carried out on the pump laser through the electrical system; carrying out two-characteristic fusion processing and optimization adjustment on an optical signal output by the pump laser through an optical system to obtain optimization adjustment information; acquiring temperature error information, supply error information, simulation error information and adjustment error information; according to the invention, the requirement for the size of the pump light is reduced, the requirement for the energy consumption is reduced, the dual-wavelength high signal-to-noise ratio fusion is realized, and the stability of the current is adjusted according to the fluctuation temperature influence coefficient, so that the method and the device have the advantages that the requirements for the size of the pump light and the energy consumption are reduced; and meanwhile, influence analysis of current stability on temperature is realized.

Description

Technical Field

[0001] This invention proposes a design method and system for a high signal-to-noise ratio erbium-doped fiber amplifier, relating to the field of fiber amplifier technology, specifically to the field of high signal-to-noise ratio erbium-doped fiber amplifier technology. Background Technology

[0002] Erbium-doped fiber amplifiers (EDFAs, which are optical signal amplifiers in which erbium ions (Er³⁺) are incorporated into the fiber core through which the signal passes) were first successfully developed by the University of Southampton in the UK in 1985. They are considered one of the greatest inventions in optical fiber communication. Erbium-doped fiber is a silica fiber in which a small amount of the rare-earth element erbium (Er) ions are incorporated; this erbium ions form the core of the EDFA. Since the late 1980s, research on EDFAs has achieved significant breakthroughs, making it the most widely used optical amplification device in current optical fiber communication.

[0003] Erbium-doped fiber (EDB) generates stimulated emission under the influence of a pump source (980nm wavelength), and the emitted light varies with the input optical signal, effectively amplifying the input signal. However, existing technologies suffer from two problems. First, the EDB amplifier has low efficiency in utilizing the pump light, with most of the pump light energy being wasted. Second, the pump source has a relatively limited lifespan; higher power output means a shorter product lifespan. Third, there is a trade-off between gain bandwidth and optical signal-to-noise ratio (SNR). A larger gain bandwidth often introduces more optical noise, reducing the SNR. Achieving high SNR across multiple wavelengths remains a significant challenge.

[0004] Traditional fiber optic amplifiers tend to overlook the impact of current fluctuations on current error, and the impact of current error on temperature, making it difficult to analyze the direct effect of current stability on temperature. Summary of the Invention

[0005] This invention provides a design method and system for a high signal-to-noise ratio erbium-doped fiber amplifier to solve the above-mentioned problems:

[0006] This invention proposes a design method and system for a high signal-to-noise ratio erbium-doped fiber amplifier, the method comprising:

[0007] A high signal-to-noise ratio erbium-doped fiber amplifier is obtained by connecting the electrical and optical systems through a pump laser.

[0008] The pump laser includes an LD, a thermistor, and a TEC;

[0009] Temperature error control and current supply to the pump laser are achieved through an electrical system.

[0010] The optical system performs two characteristic fusion processing and optimization adjustment on the optical signal output from the pump laser to obtain optimized adjustment information.

[0011] The electrical system acquires temperature error information and supply error information of the pump light source;

[0012] Simulation error information and adjustment error information are obtained from current fluctuation data;

[0013] Obtain the influence coefficients of fluctuating current and temperature, and then obtain the influence coefficient of fluctuating temperature. Adjust the current stability based on the influence coefficient of fluctuating temperature.

[0014] Furthermore, the system includes:

[0015] A connection module is used to connect the electrical system and the optical system via a pump laser to obtain a high signal-to-noise ratio erbium-doped fiber amplifier;

[0016] The pump laser includes an LD, a thermistor, and a TEC;

[0017] The electrical control module is used to control the temperature error and supply current to the pump laser through the electrical system;

[0018] The optical control module is used to perform two characteristic fusion processing and optimization adjustment on the optical signal output by the pump laser through the optical system to obtain optimization adjustment information;

[0019] The current influence module is used to obtain temperature error information and supply error information of the pump light source through the electrical system;

[0020] The temperature effect module is used to obtain simulation error information and adjustment error information based on current fluctuation data.

[0021] The fluctuating temperature influence module is used to obtain the fluctuating current influence coefficient and the current temperature influence coefficient, and then to obtain the fluctuating temperature influence coefficient, and to adjust the current stability based on the fluctuating temperature influence coefficient.

[0022] The beneficial effects of this invention are: addressing the optical amplification requirements of dual wavelengths at 1540nm and 1563nm, and improving pump light utilization. It reduces the requirements for pump light size and energy consumption, and achieves high signal-to-noise ratio (SNR) fusion of the two wavelengths. Compared to traditional unidirectional two-stage amplification structures, this product's optical path, through structural optimization, significantly improves pump light utilization. Power consumption is a crucial indicator in the aerospace field; lower power consumption opens up more possibilities. Simultaneously, the unique structure greatly improves the optical SNR after dual-wavelength fusion, and a higher SNR means a longer transmission distance. The amount of information that a single wavelength of light can transmit per unit time is limited, while increasing the number of wavelengths allows for greater information transmission. Lower power consumption, longer transmission distance, and higher transmission rates are essential requirements in the aerospace field. Attached Figure Description

[0023] Figure 1 A schematic diagram illustrating a design method for a high signal-to-noise ratio erbium-doped fiber amplifier;

[0024] Figure 2 This is a first assembly structure diagram of a high signal-to-noise ratio erbium-doped fiber amplifier.

[0025] Figure 3 This is a diagram of the second assembly structure for a high signal-to-noise ratio erbium-doped fiber amplifier. Detailed Implementation

[0026] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0027] In one embodiment of the present invention, a design method and system for a high signal-to-noise ratio erbium-doped fiber amplifier are proposed, the method comprising:

[0028] S1. By connecting the electrical and optical systems through a pump laser, a high signal-to-noise ratio erbium-doped fiber amplifier is obtained, such as... Figure 2 and 3 As shown;

[0029] The pump laser includes an LD, a thermistor, and a TEC;

[0030] S2. Temperature error control and current supply to the pump laser are achieved through an electrical system;

[0031] S3. The optical signal output from the pump laser is fused and optimized using an optical system to obtain optimized adjustment information.

[0032] S4. The electrical system acquires temperature error information and supply error information of the pump light source;

[0033] S5. Obtain simulation error information and adjustment error information based on current fluctuation data;

[0034] S6. Obtain the influence coefficient of fluctuating current and the influence coefficient of current temperature, and then obtain the influence coefficient of fluctuating temperature. Adjust the current stability based on the influence coefficient of fluctuating temperature. Figure 1 As shown.

[0035] The working principle and technical effects of the above technical solution are as follows: This invention consists of an electrical system and an optical system, which are connected together by a pump laser. The pump laser has a built-in thermistor and TEC (temperature control device). The electrical system controls the pump laser through analog circuits, thereby controlling the performance of the entire optical path. The optical system adopts a typical two-stage amplification structure. The electrical system mainly consists of two parts. The first is the temperature control part, which uses the thermistor and TEC built into the pump light source to implement a PID control circuit with an error of 0.1℃. The second is the driving part, which mainly provides a stable current for the LD part of the pump laser. The current provided by the traditional circuit has high-frequency noise at different frequencies in the 10k to 10MHz frequency band.

[0036] In this invention, the filter circuit design specifically employs special filtering parameters to filter noise in the 10kHz to 10MHz frequency band, achieving high-quality pump light output. The optical system utilizes a typical two-stage amplification structure. Traditionally, PMIBP is used for single-wavelength filtering. This structure fully leverages the characteristics of PMDWDM and PMFM, and conducts in-depth and detailed research on the fiber lengths and pump light ratios of the first and second stages of amplification. Through optimized fiber lengths and pump light ratios in the first and second stages of amplification, dual-wavelength fusion and high signal-to-noise ratio characteristics are successfully achieved during the optical amplification process.

[0037] Furthermore, by acquiring temperature error information, supply error information, simulation error information, and adjustment error information, it is possible to analyze and adjust the impact of current stability on current output error, and the impact of current output error on temperature output difference. This enables the analysis and adjustment of the impact of current stability on temperature error, thereby improving the accuracy of temperature determination and the stability of current.

[0038] This product addresses the need for dual-wavelength optical amplification at 1540nm and 1563nm, while improving pump light utilization. It reduces the requirements for pump light size and energy consumption, and achieves high signal-to-noise ratio (SNR) fusion of the two wavelengths. Compared to traditional unidirectional two-stage amplification structures, this product's optical path optimization significantly improves pump light utilization. Simultaneously, its unique structure greatly enhances the SNR after dual-wavelength fusion, and a higher SNR translates to a longer transmission distance. The amount of information that a single wavelength can transmit per unit time is limited, while increasing the number of wavelengths allows for greater information transmission.

[0039] In one embodiment of the present invention, the temperature error control and current supply to the pump laser via an electrical system includes:

[0040] The electrical system includes a temperature control section and a drive section;

[0041] The temperature control section of the electrical system controls the temperature error of the pump light source through the thermistor and TEC of the pump light source, and obtains temperature error control data.

[0042] The drive section of the electrical system provides a stable current to the LD section of the pump laser.

[0043] The working principle and technical effect of the above technical solution are as follows: the electrical system achieves precise control of the pump laser through the coordinated action of the temperature control part and the driving part.

[0044] The pump source's built-in thermistor monitors the laser temperature in real time, converting the temperature signal into an electrical signal for feedback. It compares the actual temperature with a set threshold, calculates the temperature error, and then drives the TEC (thermal cooler). When the temperature is too high, the TEC receives a forward current for cooling; when the temperature is too low, it receives a reverse current for heating, dynamically correcting the temperature error and forming a closed-loop "detection-comparison-adjustment" system. Ultimately, it outputs temperature error control data.

[0045] The driver section features a current-stabilizing circuit designed for the pumped laser LD (laser diode). A high-precision DC power supply and feedback adjustment module provide a stable operating current to the LD. The circuit monitors output current fluctuations in real time. If a deviation occurs (such as current drift caused by load changes), the feedback module immediately adjusts the power supply output to ensure the current ripple coefficient is controlled within an extremely low range, meeting the LD's stringent requirements for power supply stability.

[0046] This invention significantly improves the operational stability of pump lasers:

[0047] The temperature control section, through the synergy of TEC and thermistor, can control the temperature error within ±0.1℃, effectively suppressing the LD wavelength shift caused by temperature drift, ensuring the efficient coupling and separation of dual-wavelength signals by PMDWDM (polarization-maintaining dense wavelength division multiplexer), and laying the foundation for dual-wavelength fusion in the subsequent amplification stage.

[0048] The current stabilization design of the drive section reduces the current fluctuation amplitude, avoids instantaneous jumps in LD output power, and reduces the interference of pump light power fluctuations on the gain characteristics of the amplified fiber. Combined with the parameter optimization of the first and second stage amplification structures (such as fiber length and pump ratio adjustment), the signal-to-noise ratio of the optical signal can be improved, and the bit error rate can be stably controlled below a certain range, ultimately achieving highly stable dual-wavelength optical signal amplification output.

[0049] In one embodiment of the present invention, the step of performing two characteristic fusion processing and optimization adjustment on the optical signal output from the pump laser through an optical system to obtain optimized adjustment information includes:

[0050] The optical system includes a two-pole amplification structure;

[0051] The optical system uses PMDWDM characteristics combined with PMFM features to fuse optical signals and obtain fused information.

[0052] The fiber lengths and pump light ratios of the first-stage and second-stage amplification structures are adjusted to obtain optimized adjustment information.

[0053] The working principle and technical effects of the above technical solution are as follows: The optical system includes a two-stage amplification structure, and optical signal processing is completed through characteristic fusion and parameter optimization. By leveraging the polarization preservation and wavelength division multiplexing characteristics of PMDWDM, combined with the noise immunity and modulation characteristics of PMFM, the optical signal output from the pump laser is fused, which can maintain the stability of the polarization state of the dual-wavelength signal, reduce interference during transmission, and thus obtain fused processing information.

[0054] When adjusting the two-stage amplification structure, the first-stage amplification structure first adjusts the fiber length with a certain precision until the dual-wavelength power fluctuation is at a low level, and then adjusts the pump ratio to make the signal-to-noise ratio reach the standard. The second-stage amplification structure adjusts the length with the same precision until the dual-wavelength fusion is at a high level, and then adjusts the pump ratio to make the bit error rate meet the requirements, thereby obtaining optimized adjustment information.

[0055] This achieves efficient fusion of two wavelengths, improves the signal-to-noise ratio, and ensures the stability of the optical signal amplification process and the high quality of the output signal.

[0056] In one embodiment of the present invention, the electrical system acquires temperature error information and supply error information of the pump light source, including:

[0057] The temperature control section of the electrical system obtains the actual temperature information of the pump light source through the thermistor of the pump light source.

[0058] Obtain the set temperature information of the pump light source, and obtain temperature error information based on the actual temperature information and the set temperature information;

[0059] Based on the temperature error information, determine the required supply current information for the thermistor and TEC, and obtain the set supply current;

[0060] The thermistor and TEC are supplied with current according to the set supply current to obtain the actual supply current;

[0061] Obtain the absolute value of the difference between the set supply current and the actual supply current to obtain supply error information.

[0062] The regulation and control of current, temperature, and stability are handled separately by the thermistor and TEC.

[0063] The working principle and technical effect of the above technical solution are as follows: The temperature control part of the electrical system collects the actual temperature information of the pump light source in real time through a thermistor, and at the same time calls the preset set temperature information of the system. The actual temperature information is compared and calculated with the set temperature information to obtain the difference between the two, thereby obtaining the temperature error information. This information directly reflects the degree of deviation between the current temperature of the pump light source and the target temperature.

[0064] Based on the obtained temperature error information, the required supply current for the thermistor and TEC to operate normally is determined, and the set supply current parameters are generated. Current is supplied to the thermistor and TEC according to the set supply current, and the actual output current value is monitored in real time to obtain the actual supply current. By calculating the absolute value of the difference between the set supply current and the actual supply current, the supply error information is obtained, reflecting the accuracy of the current supply.

[0065] The above scheme enables the analysis of current supply error.

[0066] By acquiring temperature error information in real time, the system can promptly grasp the temperature status of the pump light source and ensure the stability of the light source's operating temperature. Supply error information can reflect the accuracy of current supply, which can optimize power supply control, reduce the impact of current fluctuations on temperature control, and thus improve the operational stability and optical signal processing quality of the entire optical system.

[0067] In one embodiment of the present invention, obtaining analog error information and adjustment error information based on current fluctuation data includes:

[0068] Acquire current fluctuation data during the current supply process, and determine the maximum and minimum current fluctuation values ​​based on the current fluctuation data;

[0069] Obtain the simulated supply current corresponding to the maximum current fluctuation, and thus obtain the maximum supply current.

[0070] Obtain the simulated attack current corresponding to the minimum current fluctuation to obtain the minimum supply current;

[0071] Obtain the absolute value of the difference between the maximum and minimum supply current to obtain simulation error information.

[0072] The working principle and technical effect of the above technical solution are as follows: During the current supply process, current fluctuation data is first collected to determine the maximum and minimum values ​​of the current fluctuation. The simulated supply current corresponding to the maximum current fluctuation is found as the maximum supply current; the simulated supply current corresponding to the minimum current fluctuation is obtained as the minimum supply current. By calculating the absolute value of the difference between the maximum and minimum supply currents, simulation error information is obtained, which intuitively reflects the degree of supply difference caused by current fluctuations.

[0073] The above scheme enables the analysis of current fluctuations.

[0074] The simulation error information clearly shows the fluctuation range of the current supply. Based on this information, the power supply control can be optimized to reduce the current fluctuation amplitude, improve the accuracy of the current supply, thereby enhancing the regulation stability of the temperature control system and ensuring the consistency of optical signal processing in the optical system.

[0075] In one embodiment of the present invention, the step of obtaining analog error information and adjustment error information based on current fluctuation data further includes:

[0076] The simulated adjustment temperature corresponding to the set supply current is obtained by acquiring supply error information, and the first adjustment temperature is obtained.

[0077] The simulated adjustment temperature corresponding to the actual supply current is obtained from the supply error information to obtain the second adjustment temperature;

[0078] Obtain the absolute value of the difference between the first and second regulated temperatures to obtain regulation error information.

[0079] The working principle and technical effect of the above technical solution are as follows: Combining the supply error information, the simulated adjustment temperature corresponding to the set supply current is extracted and used as the first adjustment temperature; simultaneously, the simulated adjustment temperature corresponding to the actual supply current is obtained and used as the second adjustment temperature. By calculating the absolute value of the difference between the first and second adjustment temperatures, the adjustment error information is obtained, which directly reflects the temperature adjustment deviation caused by the difference in current supply.

[0080] The adjustment error information clearly shows the extent to which current supply error affects temperature regulation. Based on this information, the temperature control algorithm can be optimized to reduce temperature regulation deviation, enhance the adaptability of the temperature control system to current fluctuations, and thus ensure the stability of the pump light source's operating temperature.

[0081] In one embodiment of the present invention, obtaining the fluctuation current influence coefficient and the current-temperature influence coefficient, and then obtaining the fluctuation temperature influence coefficient, and adjusting the current stability based on the fluctuation temperature influence coefficient, includes:

[0082] The ratio of simulation error information to supply error information is obtained to obtain the fluctuation current influence coefficient; the fluctuation current influence coefficient is the influence of current supply stability on the current supply value.

[0083] The ratio of adjustment error information to temperature error information is obtained to obtain the current-temperature influence coefficient; the current-temperature influence coefficient is the effect of the current supply value on the temperature.

[0084] The fluctuation temperature influence coefficient is obtained by multiplying the fluctuation current influence coefficient and the current temperature influence coefficient.

[0085] Current stability adjustment analysis was performed based on the influence coefficient of fluctuating temperature.

[0086] The working principle and technical effects of the above solution are as follows: By calculating the ratio of simulation error information to supply error information, a fluctuation current influence coefficient is obtained. This coefficient reflects the degree of influence of current supply stability on the current supply value. Simultaneously, the ratio of adjustment error information to temperature error information is calculated to obtain the current temperature influence coefficient, thus reflecting the influence of the current supply value on temperature. Multiplying the fluctuation current influence coefficient and the current temperature influence coefficient yields the fluctuation temperature influence coefficient, which comprehensively reflects the indirect impact of current fluctuations on temperature through supply differences. Based on this coefficient, the correlation between current stability and temperature fluctuations can be analyzed in depth.

[0087] The temperature fluctuation influence coefficient provides a quantitative characterization of the impact of current fluctuations on temperature. Adjustment analysis based on this coefficient allows for targeted optimization of current supply stability, reducing temperature deviations caused by current fluctuations and improving the overall accuracy of the temperature control system. This ensures the stability of the pump light source's operating temperature, thereby guaranteeing the consistency and high quality of optical signal processing in the optical system.

[0088] In one embodiment of the present invention, the current stability adjustment analysis based on the temperature fluctuation influence coefficient includes:

[0089] The fluctuation temperature influence coefficient is compared with the preset fluctuation temperature influence threshold.

[0090] When the fluctuation temperature influence coefficient is greater than the preset fluctuation temperature influence threshold, the current is adjusted for stability, and the current stability adjustment data is obtained, and the temperature error adjustment data is obtained.

[0091] When the fluctuation temperature influence coefficient is less than or equal to the preset fluctuation temperature influence threshold, the current stability is not adjusted.

[0092] The working principle and technical effect of the above technical solution are as follows: A preset threshold for the impact of fluctuating temperature is defined. This threshold is a critical value set based on the system's requirements for temperature stability. The calculated coefficient of fluctuating temperature impact is compared with this preset threshold to determine whether the impact of current fluctuations on temperature exceeds an acceptable range. When the coefficient of fluctuating temperature impact is greater than the preset threshold, it indicates that the impact of current fluctuations on temperature is significant, requiring current stability adjustment. Current stability adjustment data is obtained by adjusting power supply parameters, etc., and temperature error adjustment data is then obtained to correct temperature deviations. When the coefficient of fluctuating temperature impact is less than or equal to the preset threshold, it indicates that the impact of current fluctuations on temperature is within the allowable range, and no current stability adjustment is required; the current operating state can be maintained.

[0093] The threshold-based regulation and analysis mechanism enables precise and dynamic control of current stability. Timely intervention when current fluctuations exceed temperature limits effectively curbs the expansion of temperature deviations and ensures the stability of the temperature environment. Conversely, no adjustment is made when the impact is within limits, reducing unnecessary operations and lowering system energy consumption and regulation costs. Overall, this mechanism improves the system's response efficiency to the correlation between current fluctuations and temperature.

[0094] In one embodiment of the present invention, adjusting the fiber length and pump light ratio of the first-stage amplification structure and the second-stage amplification structure to obtain optimized adjustment information includes:

[0095] Based on the PMDWDM characteristic information combined with the PMFM characteristic information (PMDWDM polarization-preserving bandwidth, channel isolation, and PMFM modulation bandwidth and noise immunity threshold), the initial range of the first fiber length, the initial range of the second fiber length, the first pump light ratio range, and the second pump light ratio range of the first-stage amplification structure and the second-stage amplification structure are set.

[0096] The fiber length is adjusted within the initial range of the first fiber length until the power fluctuation of the dual-wavelength signal is less than or equal to the threshold, thus obtaining the first fiber adjustment length.

[0097] Based on the first fiber adjustment length, the pump light ratio is adjusted within the pump light ratio range until the signal-to-noise ratio meets the standard and the phase difference is within the preset phase difference threshold, thereby obtaining the first adjustment power ratio.

[0098] The fiber length is adjusted within the initial range of the second fiber length until the dual-wavelength fusion degree is greater than the preset fusion threshold, thus obtaining the adjusted length of the second fiber.

[0099] Based on the second fiber adjustment length, the pump light ratio is adjusted within the pump light ratio range until the bit error rate is less than or equal to the preset bit error rate threshold, thereby obtaining the second adjustment power ratio.

[0100] The working principle and technical effect of the above technical solution are as follows: A possible real-time method is to extract the polarization holding bandwidth and channel isolation of PMDWDM and the modulation bandwidth and noise immunity threshold of PMFM.

[0101] Based on the characteristics, the initial range of the length of the first and second stage amplification fibers (L1±ΔL1, L2±ΔL2) and the pump light ratio range (K±ΔK) are set.

[0102] Adjust the fiber length within L1±ΔL1 with an accuracy of 0.1m until the power fluctuation of the dual-wavelength signal is ≤0.5%, then lock it as L1a.

[0103] Based on L1a, the pump ratio is adjusted in 0.5% steps within K±ΔK until the signal-to-noise ratio meets the standard and the phase difference is stable within ±0.1 rad, which is denoted as K1a.

[0104] Adjust the fiber length within L2±ΔL2 with an accuracy of 0.1m until the dual-wavelength fusion degree is ≥98%, and then determine it as L2a.

[0105] Based on L2a, the pump ratio is adjusted in 0.5% steps within K±ΔK until the bit error rate is ≤10⁻¹², denoted as K2a.

[0106] The combined parameters were tested for 72 hours to ensure the stability of dual-wavelength fusion and signal-to-noise ratio.

[0107] Confirm the parameters and encrypt and lock them to achieve the target characteristics.

[0108] Compared to traditional unidirectional two-stage amplification structures, this invention significantly improves the utilization rate of pump light through structural optimizations in the optical path. The unique structure greatly enhances the optical signal-to-noise ratio after dual-wavelength fusion, and a higher signal-to-noise ratio translates to a longer transmission distance. The amount of information that a single wavelength of light can transmit per unit time is limited, while increasing the number of wavelengths allows for greater information transmission.

[0109] In one embodiment of the present invention, the system includes:

[0110] A connection module is used to connect the electrical system and the optical system via a pump laser to obtain a high signal-to-noise ratio erbium-doped fiber amplifier;

[0111] The pump laser includes an LD, a thermistor, and a TEC;

[0112] The electrical control module is used to control the temperature error and supply current to the pump laser through the electrical system;

[0113] The optical control module is used to perform two characteristic fusion processing and optimization adjustment on the optical signal output by the pump laser through the optical system to obtain optimization adjustment information;

[0114] The current influence module is used to obtain temperature error information and supply error information of the pump light source through the electrical system;

[0115] The temperature effect module is used to obtain simulation error information and adjustment error information based on current fluctuation data.

[0116] The fluctuating temperature influence module is used to obtain the fluctuating current influence coefficient and the current temperature influence coefficient, and then to obtain the fluctuating temperature influence coefficient, and to adjust the current stability based on the fluctuating temperature influence coefficient.

[0117] The working principle and technical effects of the above technical solution are as follows: This invention consists of an electrical system and an optical system, which are connected together by a pump laser. The pump laser has a built-in thermistor and TEC (temperature control device). The electrical system controls the pump laser through analog circuits, thereby controlling the performance of the entire optical path. The optical system adopts a typical two-stage amplification structure. The electrical system mainly consists of two parts. The first is the temperature control part, which uses the thermistor and TEC built into the pump light source to implement a PID control circuit with an error of 0.1℃. The second is the driving part, which mainly provides a stable current for the LD part of the pump laser. The current provided by the traditional circuit has high-frequency noise at different frequencies in the 10k to 10MHz frequency band.

[0118] Furthermore, by acquiring temperature error information, supply error information, simulation error information, and adjustment error information, it is possible to analyze and adjust the impact of current stability on current output error, and the impact of current output error on temperature output difference. This enables the analysis and adjustment of the impact of current stability on temperature error, thereby improving the accuracy of temperature determination and the stability of current.

[0119] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A design method for a high signal-to-noise ratio erbium-doped fiber amplifier, characterized in that, The method includes: A high signal-to-noise ratio erbium-doped fiber amplifier is obtained by connecting the electrical and optical systems through a pump laser. The pump laser includes an LD, a thermistor, and a TEC; Temperature error control and current supply to the pump laser are achieved through an electrical system. The optical system performs two characteristic fusion processing and optimization adjustment on the optical signal output from the pump laser to obtain optimized adjustment information. The electrical system acquires temperature error information and supply error information of the pump light source; Simulation error information and adjustment error information are obtained from current fluctuation data; Obtain the influence coefficients of fluctuating current and temperature, and then obtain the influence coefficient of fluctuating temperature. Adjust the current stability based on the influence coefficient of fluctuating temperature.

2. The design method of a high signal-to-noise ratio erbium-doped fiber amplifier according to claim 1, characterized in that, The method of controlling the temperature error and supplying current to the pump laser via an electrical system includes: The electrical system includes a temperature control section and a drive section; The temperature control section of the electrical system controls the temperature error of the pump light source through the thermistor and TEC of the pump light source, and obtains temperature error control data. The drive section of the electrical system provides a stable current to the LD section of the pump laser.

3. The design method for a high signal-to-noise ratio erbium-doped fiber amplifier according to claim 1, characterized in that, The process involves fusing and optimizing the optical signal output from the pump laser using an optical system to obtain optimized adjustment information, including: The optical system includes a two-pole amplification structure; The optical system uses PMDWDM characteristics combined with PMFM features to fuse optical signals and obtain fused information. The fiber lengths and pump light ratios of the first-stage and second-stage amplification structures are adjusted to obtain optimized adjustment information.

4. The design method of a high signal-to-noise ratio erbium-doped fiber amplifier according to claim 1, characterized in that, The electrical system acquires temperature error information and supply error information of the pump light source, including: The temperature control section of the electrical system obtains the actual temperature information of the pump light source through the thermistor of the pump light source. Obtain the set temperature information of the pump light source, and obtain temperature error information based on the actual temperature information and the set temperature information; Based on the temperature error information, determine the required supply current information for the thermistor and TEC, and obtain the set supply current; The thermistor and TEC are supplied with current according to the set supply current to obtain the actual supply current; Obtain the absolute value of the difference between the set supply current and the actual supply current to obtain supply error information.

5. The design method of a high signal-to-noise ratio erbium-doped fiber amplifier according to claim 1, characterized in that, The process of obtaining analog error information and adjustment error information based on current fluctuation data includes: Acquire current fluctuation data during the current supply process, and determine the maximum and minimum current fluctuation values ​​based on the current fluctuation data; Obtain the simulated supply current corresponding to the maximum current fluctuation, and thus obtain the maximum supply current. Obtain the simulated attack current corresponding to the minimum current fluctuation to obtain the minimum supply current; Obtain the absolute value of the difference between the maximum and minimum supply current to obtain simulation error information.

6. The design method of a high signal-to-noise ratio erbium-doped fiber amplifier according to claim 5, characterized in that, The step of obtaining analog error information and adjustment error information based on current fluctuation data also includes: The simulated adjustment temperature corresponding to the set supply current is obtained by acquiring supply error information, and the first adjustment temperature is obtained. The simulated adjustment temperature corresponding to the actual supply current is obtained from the supply error information to obtain the second adjustment temperature; Obtain the absolute value of the difference between the first and second regulated temperatures to obtain regulation error information.

7. The design method of a high signal-to-noise ratio erbium-doped fiber amplifier according to claim 1, characterized in that, The process of obtaining the fluctuation current influence coefficient and the current-temperature influence coefficient, and then obtaining the fluctuation temperature influence coefficient, and adjusting the current stability based on the fluctuation temperature influence coefficient, includes: The ratio of simulation error information to supply error information is used to obtain the fluctuation current influence coefficient. The ratio of adjustment error information to temperature error information is obtained to obtain the current-temperature influence coefficient. The fluctuation temperature influence coefficient is obtained by multiplying the fluctuation current influence coefficient and the current temperature influence coefficient. Current stability adjustment analysis was performed based on the influence coefficient of fluctuating temperature.

8. The design method of a high signal-to-noise ratio erbium-doped fiber amplifier according to claim 7, characterized in that, The current stability adjustment analysis based on the temperature fluctuation influence coefficient includes: The fluctuation temperature influence coefficient is compared with the preset fluctuation temperature influence threshold. When the fluctuation temperature influence coefficient is greater than the preset fluctuation temperature influence threshold, the current is adjusted for stability, and the current stability adjustment data is obtained, and the temperature error adjustment data is obtained. When the fluctuation temperature influence coefficient is less than or equal to the preset fluctuation temperature influence threshold, the current stability is not adjusted.

9. The design method of a high signal-to-noise ratio erbium-doped fiber amplifier according to claim 3, characterized in that, The process of adjusting the fiber length and pump light ratio of the first-stage and second-stage amplification structures to obtain optimized adjustment information includes: Based on the PMDWDM feature information and the PMFM feature information, the initial range of the first fiber length, the initial range of the second fiber length, the first pump light ratio range, and the second pump light ratio range of the first-stage amplification structure and the second-stage amplification structure are set. The fiber length is adjusted within the initial range of the first fiber length until the power fluctuation of the dual-wavelength signal is less than or equal to the threshold, thus obtaining the first fiber adjustment length. Based on the first fiber adjustment length, the pump light ratio is adjusted within the pump light ratio range until the signal-to-noise ratio meets the standard and the phase difference is within the preset phase difference threshold to obtain the first adjustment power ratio; The fiber length is adjusted within the initial range of the second fiber length until the dual-wavelength fusion degree is greater than the preset fusion threshold, thus obtaining the adjusted length of the second fiber. Based on the second fiber adjustment length, the pump light ratio is adjusted within the pump light ratio range until the bit error rate is less than or equal to the preset bit error rate threshold, thereby obtaining the second adjustment power ratio.

10. A design system for a high signal-to-noise ratio erbium-doped fiber amplifier, characterized in that, The system includes: A connection module is used to connect the electrical system and the optical system via a pump laser to obtain a high signal-to-noise ratio erbium-doped fiber amplifier; The pump laser includes an LD, a thermistor, and a TEC; The electrical control module is used to control the temperature error and supply current to the pump laser through the electrical system; The optical control module is used to perform two characteristic fusion processing and optimization adjustment on the optical signal output by the pump laser through the optical system to obtain optimization adjustment information; The current influence module is used to obtain temperature error information and supply error information of the pump light source through the electrical system; The temperature effect module is used to obtain simulation error information and adjustment error information based on current fluctuation data. The fluctuating temperature influence module is used to obtain the fluctuating current influence coefficient and the current temperature influence coefficient, and then to obtain the fluctuating temperature influence coefficient, and to adjust the current stability based on the fluctuating temperature influence coefficient.

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