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

Abstract

The application provides a design method and system of an erbium-doped fiber amplifier with high signal-to-noise ratio, relates to the technical field of fiber amplifiers, and connects an electrical system and an optical system through a pump laser to obtain the erbium-doped fiber amplifier with high signal-to-noise ratio; the electrical system is used for temperature error control and current supply of the pump laser; the optical system is used for two characteristic fusion processing and optimal adjustment of optical signals output by the pump laser to obtain optimal adjustment information; temperature error information, supply error information, simulation error information and adjustment error information are obtained; a fluctuation current influence coefficient and a current temperature influence coefficient are obtained, and then a fluctuation temperature influence coefficient is obtained; current stability is adjusted according to the fluctuation temperature influence coefficient; the application reduces the requirements for the size of pump light and energy consumption, realizes high signal-to-noise ratio fusion of dual wavelengths, and realizes analysis of the influence of current stability on temperature.

Description

TECHNICAL FIELD

[0001] The application provides a design method and system of a high-signal-to-noise ratio erbium-doped fiber amplifier, and relates to the technical field of optical fiber amplifiers, in particular to the technical field of high-signal-to-noise ratio erbium-doped fiber amplifiers. BACKGROUND

[0002] The erbium-doped fiber amplifier (EDFA, namely an optical signal amplifier in which erbium ions Er3+ are doped in a fiber core through which signals pass) is an optical amplifier developed by the University of Southampton in the United Kingdom in 1985, and it is one of the greatest inventions in optical fiber communication. The erbium-doped fiber is an optical fiber in which a small amount of rare earth element erbium (Er) ions are doped, and it is the core of the erbium-doped fiber amplifier. Since the late 1980s, the research work of the erbium-doped fiber amplifier has continuously made major breakthroughs, and it has become the most widely used optical amplifier device in current optical fiber communication.

[0003] The erbium-doped fiber produces stimulated radiation under the action of a pump light source (wavelength 980 nm), and the radiated light changes with the input light signal, which is equivalent to amplifying the input light signal. The prior art has two problems. One is that the erbium-doped fiber amplifier has a low utilization efficiency of pump light, and most of the energy of the pump light is wasted. At the same time, the service life of the pump light source is relatively limited, and higher power output means shorter product service life. The other is the contradiction between the gain bandwidth and the optical signal-to-noise ratio. A larger gain bandwidth often introduces more optical noise, which reduces the optical signal-to-noise ratio. How to realize multi-wavelength high signal-to-noise ratio becomes a difficult problem.

[0004] The traditional optical fiber amplifier easily ignores the influence of current fluctuation on current error, the influence of current error on temperature, and the direct influence of current stability on temperature. SUMMARY

[0005] The application provides a design method and system of a high-signal-to-noise ratio erbium-doped fiber amplifier to solve the above problems.

[0006] The application provides a design method and system of a high-signal-to-noise ratio erbium-doped fiber amplifier, and the method comprises the following steps:

[0007] The electrical system and the optical system are connected by a pump laser to obtain a high-signal-to-noise ratio erbium-doped fiber amplifier.

[0008] The pump laser comprises an LD, a thermistor and a TEC.

[0009] The electrical system controls the temperature error and supplies current to the pump laser.

[0010] The optical system is used for two characteristic fusion processing and optimal adjustment of the light signal output by the pump laser, and optimal adjustment information is obtained.

[0011] The electrical system is used for obtaining temperature error information and supply error information of the pump light source.

[0012] The current fluctuation data are used for obtaining analog error information and adjustment error information.

[0013] The fluctuation current influence coefficient and the current temperature influence coefficient are obtained, and then the fluctuation temperature influence coefficient is obtained, and the current stability is adjusted according to the fluctuation temperature influence coefficient.

[0014] Further, the system comprises:

[0015] The connecting module is used for connecting the electrical system and the optical system through the pump laser, and obtaining the high signal-to-noise ratio erbium-doped fiber amplifier.

[0016] The pump laser comprises an LD, a thermistor and a TEC.

[0017] The electrical control module is used for temperature error control and current supply of the pump laser through the electrical system.

[0018] The optical control module is used for two characteristic fusion processing and optimal adjustment of the light signal output by the pump laser through the optical system, and optimal adjustment information is obtained.

[0019] The current influence module is used for obtaining temperature error information and supply error information of the pump light source through the electrical system.

[0020] The temperature influence module is used for obtaining analog error information and adjustment error information according to the current fluctuation data.

[0021] The fluctuation temperature influence module is used for 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 according to the fluctuation temperature influence coefficient.

[0022] The application has the advantages of meeting the light amplification demand of 1540nm and 1563nm dual wavelengths, and improving the utilization rate of pump light. The size requirement of the pump light is reduced, the energy consumption requirement is reduced, and high signal-to-noise ratio fusion of dual wavelengths is realized. Compared with the traditional one-way two-stage amplification structure, the utilization rate of the pump light is greatly improved through the optimization of the optical path structure. The power consumption is an important index in the field of aerospace, and lower power consumption can bring more possibilities. At the same time, the unique structure greatly improves the optical signal-to-noise ratio after the fusion of dual wavelengths, and higher signal-to-noise ratio means longer transmission distance. The amount of information that a single wavelength of light can transmit in a unit of time is certain, and the increase in the number of wavelengths can bring more information transmission. Lower power consumption, longer transmission distance and higher transmission rate are required in the field of aerospace. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a design method diagram of a high signal-to-noise ratio erbium-doped fiber amplifier;

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

[0025] Figure 3 It is a second assembly structure diagram of a high signal-to-noise ratio erbium-doped fiber amplifier. DETAILED DESCRIPTION

[0026] The preferred embodiments of the application are described below in conjunction with the accompanying drawings, and it should be understood that the preferred embodiments described herein are only used to illustrate and explain the application, and are not used to limit the application.

[0027] In one embodiment of the application, the application provides a design method and system of a high signal-to-noise ratio erbium-doped fiber amplifier, and the method comprises:

[0028] S1, connecting the electrical system and the optical system through a pump laser to obtain a high signal-to-noise ratio erbium-doped fiber amplifier, as shown in Figure 2 and 3 ;

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

[0030] S2, temperature error control and current supply of the pump laser through the electrical system;

[0031] S3, two characteristic fusion processing and optimization adjustment of the optical signal output by the pump laser through the optical system to obtain optimization adjustment information;

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

[0033] S5, acquiring analog error information and adjustment error information according to the current fluctuation data;

[0034] S6, acquiring fluctuation current influence coefficient and current temperature influence coefficient, and then acquiring fluctuation temperature influence coefficient, and adjusting current stability according to the fluctuation temperature influence coefficient, as shown in Figure 1

[0035] The working principle and technical effects of the above technical solution are as follows: the present application is composed of an electrical system and an optical system, and the two systems are connected together through a pump laser. The pump laser internally has a thermistor and a TEC (temperature control device). The electrical system controls the pump laser through an analog circuit, thereby realizing control of 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. One is a temperature control part, which realizes a PID control circuit with an error of 0.1 DEG C by using the thermistor and the TEC internally provided by the pump light source. The other is a 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 of different frequencies in the frequency band of 10k to 10MHz.

[0036] In the present application, the noise in the frequency band of 10k to 10MHz is specially filtered by using special filtering parameters in the filter circuit design, so that high-quality pump light is output. The optical system uses a typical two-stage amplification structure. The traditional way is to use PMIBP to filter single wavelength. In the present structure, the characteristics of PMDWDM and PMFM are fully utilized, and the lengths of the first and second amplification fibers and the optimal ratio of pump light are deeply and carefully studied, so that the dual-wavelength fusion and high signal-to-noise ratio characteristics in the optical amplification process are successfully realized.

[0037] By acquiring temperature error information, supply error information, analog error information and adjustment error information, the analysis and adjustment of the influence of current stability on current output error and the influence of current output error on temperature output difference are realized, and the analysis and adjustment of the influence of current stability on temperature error are realized, thereby improving the accuracy of temperature and the stability of current.

[0038] The present application meets the demand of optical amplification of 1540nm and 1563nm dual wavelengths, and improves the utilization rate of pump light. The requirement for the size of pump light is reduced, the requirement for energy consumption is reduced, and the high signal-to-noise ratio fusion of dual wavelengths is realized. Compared with the traditional one-way two-stage amplification structure, the optical path of the present product is optimized in structure, so that the utilization rate of pump light is greatly improved. At the same time, the unique structure greatly improves the optical signal-to-noise ratio after dual-wavelength fusion, and higher signal-to-noise ratio means longer transmission distance. The amount of information transmitted by single-wavelength light in unit time is certain, and the increase of the number of wavelengths can bring more information transmission amount.​

[0039] One embodiment of the present application, the temperature error control and current supply of the pump laser by the electrical system, comprising:

[0040] The electrical system includes a temperature control part and a driving part;

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

[0042] The driving part of the electrical system provides stable current to the LD part of the pump laser.

[0043] The working principle and technical effects of the above technical scheme are: the electrical system realizes the accurate regulation and control of the pump laser through the synergistic effect of the temperature control part and the driving part.

[0044] The thermistor built-in in the pump light source detects the temperature of the laser in real time, converts the temperature signal into an electrical signal for feedback, compares the actual temperature with the set threshold, calculates the temperature error, and drives the TEC (semiconductor cooler) to work. When the temperature is too high, the TEC is connected with forward current for refrigeration; when the temperature is too low, the reverse current is connected to realize heating, dynamically corrects the temperature error, forms a closed loop of "detection - comparison - adjustment", and finally outputs the temperature error control data.

[0045] The driving part designs a constant current circuit for the LD (laser diode) of the pump laser, and provides stable working current for the LD through high-precision DC power supply and feedback adjustment module. The circuit monitors the output current fluctuation in real time, and if there is deviation (such as current drift caused by load change), the feedback module immediately adjusts the power output to ensure that the current ripple coefficient is controlled in a very low range, meeting the stringent requirements of LD on power supply stability.

[0046] The present application significantly improves the working stability of the pump laser:

[0047] The temperature control part can control the temperature error within ±0.1℃ through the cooperation of TEC and thermistor, effectively suppresses the wavelength shift of LD caused by temperature drift, and guarantees the efficient coupling and separation of double-wavelength signals by PMDWDM (polarization maintaining dense wavelength division multiplexer), laying a foundation for the subsequent double-wavelength fusion of amplification link.

[0048] The current fluctuation range is reduced by the current stabilizing design of the driving part, the instantaneous jump of the LD output power is avoided, the interference of the pump light power fluctuation on the gain characteristics of the amplification fiber is reduced, the signal-to-noise ratio of the optical signal is improved by matching the parameter optimization (such as the fiber length and the pump ratio adjustment) of the first and second amplification structures, the bit error rate is stably controlled within a certain range, and finally the high-stability dual-wavelength optical signal amplification output is realized.

[0049] In an embodiment of the present application, the optical system performs two characteristic fusion processing and optimal adjustment on the optical signal output by the pump laser, and obtains optimal adjustment information, which includes:

[0050] The optical system includes a two-stage amplification structure.

[0051] The optical system performs fusion processing on the optical signal by combining the PMDWDM characteristics with the PMFM characteristics, and obtains fusion processing information.

[0052] The fiber length and pump light ratio of the first-stage amplification structure and the second-stage amplification structure are adjusted to obtain optimal 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 performs optical signal processing by characteristic fusion and parameter optimization. By means of the polarization maintaining and wavelength division multiplexing characteristics of PMDWDM, and in combination with the noise resistance and modulation characteristics of PMFM, the optical signal output by the pump laser is fused and processed, the polarization state of the dual-wavelength signal can be maintained stably, the interference in the transmission process is reduced, and thus fusion processing information is obtained.

[0054] When adjusting the two-stage amplification structure, the first-stage amplification structure 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 so that the signal-to-noise ratio reaches the standard; the second-stage amplification structure adjusts the length with the same precision until the dual-wavelength fusion degree is at a high level, and then adjusts the pump ratio so that the bit error rate reaches the requirement, and thus optimal adjustment information is obtained.

[0055] The efficient fusion of dual-wavelength is realized, the signal-to-noise ratio is improved, and the stability of the optical signal amplification process and the high quality of the output signal are ensured.

[0056] In an embodiment of the present application, the electrical system obtains temperature error information and supply error information of the pump light source, which includes:

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

[0058] The set temperature information of the pump light source is obtained, and the temperature error information is obtained according to the actual temperature information and the set temperature information.

[0059] determine the supply current information required by the thermistor and the TEC according to the temperature error information, obtain a set supply current;

[0060] supply current to the thermistor and the TEC according to the set supply current, and obtain an actual supply current;

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

[0062] The adjustment and control of the current, temperature and stability are respectively processed for the thermistor and the TEC.

[0063] The working principle and technical effects 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 the thermistor, and calls the set temperature information preset by the system. The actual temperature information and the set temperature information are compared and calculated to obtain the difference between the two, so as to obtain the temperature error information, which directly reflects the deviation degree of the current temperature of the pump light source from the target temperature.

[0064] Based on the obtained temperature error information, the supply current required for the normal work of the thermistor and the TEC is determined, and the set supply current parameter is generated. The current supply is performed on the thermistor and the TEC according to the set supply current, and the actual output current value is monitored in real time to obtain the actual supply current. The absolute value of the difference between the set supply current and the actual supply current is calculated to obtain the supply error information, which reflects the accuracy of the current supply.

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

[0066] By obtaining the temperature error information in real time, the system can timely master the temperature state of the pump light source, and guarantee the stability of the working temperature of the light source. The supply error information can reflect the accuracy of the current supply, and the power supply control can be optimized to reduce the influence of current fluctuation on the temperature control effect, thereby improving the operation stability of the entire optical system and the quality of optical signal processing.

[0067] In an embodiment of the present application, the obtaining of the simulation error information and the adjustment error information according to the current fluctuation data comprises:

[0068] Obtain the current fluctuation data in the current supply process, and determine the maximum current fluctuation value and the minimum current fluctuation value according to the current fluctuation data;

[0069] Obtain the simulation supply current corresponding to the maximum current fluctuation value, and obtain the maximum supply current;

[0070] Obtain the simulation attack current corresponding to the minimum current fluctuation value, and obtain the minimum supply current;

[0071] An absolute value of a difference between the maximum supply current and the minimum supply current is obtained to obtain analog error information.

[0072] The working principle and technical effects of the technical solution are as follows: in the current supply process, current fluctuation data is first collected to determine the maximum value and the minimum value of the current fluctuation. The analog supply current corresponding to the maximum value of the current fluctuation is found as the maximum supply current, and the analog supply current corresponding to the minimum value of the current fluctuation is obtained as the minimum supply current. An absolute value of a difference between the maximum supply current and the minimum supply current is obtained to obtain analog error information, which directly reflects the difference degree caused by the current fluctuation.

[0073] The above scheme realizes analysis of the current fluctuation.

[0074] The analog error information can clearly present the fluctuation range of the current supply. According to the information, power supply control can be optimized, the current fluctuation amplitude can be reduced, the current supply accuracy can be improved, the regulation stability of the temperature control system can be enhanced, and the consistency of optical signal processing in the optical system can be ensured.

[0075] In an embodiment of the present application, the obtaining of the analog error information and the regulation error information according to the current fluctuation data further comprises:

[0076] An analog regulation temperature corresponding to the set supply current of the supply error information is obtained to obtain a first regulation temperature;

[0077] An analog regulation temperature corresponding to the actual supply current of the supply error information is obtained to obtain a second regulation temperature;

[0078] An absolute value of a difference between the first regulation temperature and the second regulation temperature is obtained to obtain regulation error information.

[0079] The working principle and technical effects of the technical solution are as follows: in combination with the supply error information, an analog regulation temperature corresponding to the set supply current is extracted as a first regulation temperature, and an analog regulation temperature corresponding to the actual supply current is obtained as a second regulation temperature. An absolute value of a difference between the first regulation temperature and the second regulation temperature is obtained to obtain regulation error information, which directly reflects the temperature regulation deviation caused by the difference in current supply.

[0080] The regulation error information clearly presents the influence degree of the current supply error on the temperature regulation. According to the information, the temperature control algorithm can be optimized, the temperature regulation deviation can be reduced, the adaptability of the temperature control system to the current fluctuation can be enhanced, and the stability of the working temperature of the pump light source can be ensured.

[0081] In an embodiment of the present application, the obtaining of the fluctuation current influence coefficient and the current temperature influence coefficient, and then the obtaining of the fluctuation temperature influence coefficient, and the current stability regulation according to the fluctuation temperature influence coefficient, comprise:

[0082] obtaining a ratio of the simulation error information and the supply error information to obtain a fluctuation current influence coefficient; the fluctuation current influence coefficient is an influence of current supply stability on a current supply value;

[0083] obtaining a ratio of the adjustment error information and the temperature error information to obtain a current temperature influence coefficient; the current temperature influence coefficient is an influence of the current supply value on the temperature.

[0084] obtaining a product of the fluctuation current influence coefficient and the current temperature influence coefficient to obtain a fluctuation temperature influence coefficient;

[0085] performing current stability adjustment analysis according to the fluctuation temperature influence coefficient.

[0086] The working principle and technical effects of the above technical solution are as follows: a ratio of simulation error information and supply error information is calculated to obtain a fluctuation current influence coefficient, which reflects the influence degree of current supply stability on a current supply value. At the same time, a ratio of adjustment error information and temperature error information is calculated to obtain a current temperature influence coefficient, which reflects the influence of the current supply value on the temperature. The product of the fluctuation current influence coefficient and the current temperature influence coefficient is obtained to obtain a fluctuation temperature influence coefficient, which comprehensively reflects the indirect influence of current fluctuation on the temperature through supply difference. Based on this coefficient, the correlation between current stability and temperature fluctuation can be analyzed in depth.

[0087] The fluctuation temperature influence coefficient realizes the quantitative characterization of the influence of current fluctuation on the temperature. According to the coefficient, the stability of current supply can be optimized, the temperature deviation caused by current fluctuation can be reduced, and the overall precision of the temperature control system can be improved. The stability of the working temperature of the pump light source can be ensured, and the consistency and high quality of the optical signal processing in the optical system can be ensured.

[0088] In an embodiment of the present application, the current stability adjustment analysis according to the fluctuation temperature influence coefficient comprises:

[0089] comparing the fluctuation temperature influence coefficient with a preset fluctuation temperature influence threshold value;

[0090] when the fluctuation temperature influence coefficient is greater than the preset fluctuation temperature influence threshold value, performing stability adjustment on the current to obtain current stability adjustment data and obtain temperature error adjustment data;

[0091] when the fluctuation temperature influence coefficient is less than or equal to the preset fluctuation temperature influence threshold value, not performing stability adjustment on the current.

[0092] The working principle and technical effects of the above technical solution are: the preset fluctuation temperature influence threshold is a critical value set based on the system requirement for temperature stability. The calculated fluctuation temperature influence coefficient is compared with the preset threshold to determine whether the influence of current fluctuation on temperature exceeds the acceptable range. When the fluctuation temperature influence coefficient is greater than the preset threshold, it indicates that the influence of current fluctuation on temperature is relatively significant, and current stability adjustment is required. The current stability adjustment data is obtained by adjusting the power supply parameters, and then the temperature error adjustment data is obtained to correct the temperature deviation. When the fluctuation temperature influence coefficient is less than or equal to the preset threshold, it indicates that the influence of current fluctuation on temperature is within the allowable range, and no current stability adjustment is required, and the current working state can be maintained.

[0093] The threshold-based adjustment analysis mechanism can realize accurate and dynamic regulation and control of current stability. When the influence of current fluctuation on temperature exceeds the limit, timely intervention can effectively curb the expansion of temperature deviation and ensure the stability of the temperature environment. When the influence does not exceed the limit, no adjustment is performed, which can reduce unnecessary operations and reduce system energy consumption and adjustment cost. Overall, this mechanism improves the response efficiency of the system to the influence of current fluctuation and temperature.

[0094] In an embodiment of the present application, the optical fiber length and pump light ratio of the first-stage amplification structure and the second-stage amplification structure are adjusted to obtain optimal adjustment information, including:

[0095] The first optical fiber length initial range, the second optical fiber length initial range, the first pump light ratio interval, and the second pump light ratio interval of the first-stage amplification structure and the second-stage amplification structure are set according to the PMDWDM characteristic information combined with the PMFM characteristic information (the polarization maintaining bandwidth and channel isolation of PMDWDM, and the modulation bandwidth and noise threshold of PMFM);

[0096] The optical fiber length is adjusted in the first optical fiber length initial range until the power fluctuation of the dual-wavelength signal is less than or equal to a threshold value, and the first optical fiber adjustment length is obtained.

[0097] The pump light ratio is adjusted in the pump light ratio interval according to the first optical fiber adjustment length until the signal-to-noise ratio meets the standard and the phase difference is within a preset phase difference threshold, and the first adjustment power ratio is obtained.

[0098] The optical fiber length is adjusted in the second optical fiber length initial range until the dual-wavelength fusion degree is greater than a preset fusion threshold, and the second optical fiber adjustment length is obtained.

[0099] The pump light ratio is adjusted in the pump light ratio interval according to the second optical fiber adjustment length until the bit error rate is less than or equal to a preset bit error rate threshold, and the second adjustment power ratio is obtained.

[0100] The working principle and technical effects of the above technical solution are as follows: a possible real-time mode: extracting the polarization maintaining bandwidth of PMDWDM, the channel isolation degree, and the modulation bandwidth and noise threshold of PMFM.

[0101] In combination with the characteristics, the initial ranges (L1±ΔL1, L2±ΔL2) of the lengths of the first and second amplification optical fibers and the pump light ratio interval (K±ΔK) are set.

[0102] The length of the optical fiber is adjusted in the range of L1±ΔL1 with a precision of 0.1 m, and the power fluctuation of the dual-wavelength signal is less than or equal to 0.5%, and L1a is locked.

[0103] Based on L1a, the pump ratio is adjusted in the range of K±ΔK with a step of 0.5%, and the signal-to-noise ratio meets the standard and the phase difference is stable within ±0.1 rad, and K1a is recorded.

[0104] The length of the optical fiber is adjusted in the range of L2±ΔL2 with a precision of 0.1 m, and the dual-wavelength fusion degree is greater than or equal to 98%, and L2a is determined.

[0105] Based on L2a, the pump ratio is adjusted in the range of K±ΔK with a step of 0.5%, and the bit error rate is less than or equal to 10⁻¹², and K2a is recorded.

[0106] The parameters are combined for 72 hours of testing to ensure stable dual-wavelength fusion and signal-to-noise ratio.

[0107] The parameters are confirmed and encrypted and locked to achieve the target characteristics.

[0108] Compared with the traditional one-way two-stage amplification structure, the optical path of the application is optimized in structure, which greatly improves the utilization rate of pump light. The unique structure greatly improves the optical signal-to-noise ratio after dual-wavelength fusion, and higher signal-to-noise ratio means longer transmission distance. The amount of information that a single-wavelength light can transmit in a unit of time is constant, and the increase in the number of wavelengths can bring more information transmission.

[0109] One embodiment of the application, the system comprises:

[0110] The connection module is used for connecting the electrical system and the optical system through the pump laser to obtain a high signal-to-noise ratio erbium-doped fiber amplifier;

[0111] The pump laser comprises an LD, a thermistor, and a TEC.

[0112] The electrical control module is used for temperature error control and current supply of the pump laser through the electrical system.

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

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

[0115] A temperature influence module is used to acquire analog error information and adjustment error information according to current fluctuation data;

[0116] A fluctuation temperature influence module is used to acquire fluctuation current influence coefficients and current temperature influence coefficients, and then acquire fluctuation temperature influence coefficients, and to perform current stability adjustment according to the fluctuation temperature influence coefficients.

[0117] The working principle and technical effects of the above technical solution are as follows: the present application is composed of an electrical system and an optical system, and the two systems are connected together through a pump laser. The pump laser internally has a thermistor and a TEC (temperature control device). The electrical system controls the pump laser through an analog circuit, thereby realizing control of the performance of the entire optical path. The optical system adopts a typical two-stage amplification structure. The electrical system is mainly composed of two parts. One is a temperature control part, which realizes a PID control circuit with an error of 0.1 DEG C by using the thermistor and the TEC provided by the pump light source. The other is a 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 of different frequencies in the frequency band of 10 k to 10 MHz.

[0118] By acquiring temperature error information, supply error information, analog error information and adjustment error information, analysis and adjustment of the influence of current stability on current output error and the influence of current output error on temperature output temperature difference are realized, thereby realizing analysis and adjustment of the influence of current stability on temperature error, and improving the accuracy of temperature and the stability of current.

[0119] Obviously, those skilled in the art can make various modifications and changes to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and changes of the present application belong to the scope of the claims of the present application and the equivalent technology thereof, the present application also intends to include these modifications and changes.

Claims

1. A method of designing a high signal-to-noise ratio erbium-doped fiber amplifier, characterized by, The method comprises: connecting the electrical system and the optical system through a pump light source to obtain an erbium-doped fiber amplifier with high signal-to-noise ratio; the pump light source comprises an LD, a thermistor and a TEC; controlling the temperature error and supplying the current of the pump light source through the electrical system; processing and optimizing the two characteristics of the optical signal output by the pump light source through the optical system to obtain the optimization adjustment information; the electrical system acquires the temperature error information and the supply error information of the pump light source; wherein the electrical system acquires the temperature error information and the supply error information of the pump light source, comprising: the temperature control part of the electrical system acquires the actual temperature information of the pump light source through the thermistor of the pump light source; acquiring the set temperature information of the pump light source, and acquiring the temperature error information according to the actual temperature information and the set temperature information; determining the supply current information required by the thermistor and the TEC according to the temperature error information, and obtaining the set supply current; supplying the current to the thermistor and the TEC according to the set supply current, and obtaining the actual supply current; acquiring the absolute value of the difference between the set supply current and the actual supply current, and acquiring the supply error information; acquiring the current fluctuation data in the current supply process, and acquiring the simulation error information and the adjustment error information according to the current fluctuation data; acquiring the fluctuation current influence coefficient and the current temperature influence coefficient, and then acquiring the fluctuation temperature influence coefficient, and adjusting the current stability according to the fluctuation temperature influence coefficient.

2. The method of claim 1, wherein the erbium-doped fiber amplifier is designed to have a high signal-to-noise ratio. the electrical system acquires the temperature error information and the supply error information of the pump light source, comprising: the electrical system comprises a temperature control part and a driving part; the temperature control part of the electrical system controls the temperature error of the pump light source through the thermistor and the TEC of the pump light source, and obtains the temperature error control data; the driving part of the electrical system provides stable current to the LD part of the pump light source.

3. The method of claim 1, wherein the erbium-doped fiber amplifier is designed to have a high signal-to-noise ratio. the optical system comprises two-stage amplification structure; the optical system combines the PMDWDM characteristics with the PMFM characteristics to process the optical signal, and obtains the fusion processing information; adjusting the fiber length and the pump light ratio of the first-stage amplification structure and the second-stage amplification structure to obtain the optimization adjustment information. the current fluctuation data is acquired, and the simulation error information and the adjustment error information are acquired according to the current fluctuation data, comprising:

4. The method of claim 1, wherein the erbium-doped fiber amplifier is designed to have a high signal-to-noise ratio. determining the maximum value and the minimum value of the current fluctuation according to the current fluctuation data; acquiring the simulation supply current corresponding to the maximum value of the current fluctuation to obtain the maximum supply current; acquiring the simulation supply current corresponding to the minimum value of the current fluctuation to obtain the minimum supply current; acquiring the absolute value of the difference between the maximum supply current and the minimum supply current to obtain the simulation error information. the current fluctuation data is acquired, and the simulation error information and the adjustment error information are acquired according to the current fluctuation data, further comprising:

5. The method of claim 4, wherein the erbium-doped fiber amplifier is designed to have a high signal-to-noise ratio. acquiring the simulation adjustment temperature corresponding to the set supply current of the supply error information to obtain the first adjustment temperature; acquiring the simulation adjustment temperature corresponding to the actual supply current of the supply error information to obtain the second adjustment temperature; acquiring the absolute value of the difference between the first adjustment temperature and the second adjustment temperature to obtain the adjustment error information. ​ 6. The method of designing an erbium-doped fiber amplifier with high signal-to-noise ratio as claimed in claim 1 wherein, The fluctuation current influence coefficient and the current temperature influence coefficient are acquired, and then the fluctuation temperature influence coefficient is acquired, and current stability regulation is performed according to the fluctuation temperature influence coefficient, including: The ratio of analog error information and supply error information is acquired to obtain the fluctuation current influence coefficient; The ratio of regulation error information and temperature error information is acquired to obtain the current temperature influence coefficient; The product of the fluctuation current influence coefficient and the current temperature influence coefficient is acquired to obtain the fluctuation temperature influence coefficient; Current stability regulation analysis is performed according to the fluctuation temperature influence coefficient.

7. The method of claim 6, wherein the erbium-doped fiber amplifier is designed to have a high signal-to-noise ratio. The current stability regulation analysis performed according to the fluctuation temperature influence coefficient includes: The fluctuation temperature influence coefficient is compared with a preset fluctuation temperature influence threshold value; When the fluctuation temperature influence coefficient is greater than the preset fluctuation temperature influence threshold value, the current is subjected to stability regulation to obtain current stability regulation data, and temperature error regulation data is acquired; When the fluctuation temperature influence coefficient is less than or equal to the preset fluctuation temperature influence threshold value, the current is not subjected to stability regulation.

8. The method of claim 3, wherein the erbium-doped fiber amplifier is designed to have a high signal-to-noise ratio. The optical fiber length and pump light ratio of the first-stage amplification structure and the second-stage amplification structure are regulated to obtain optimal regulation information, including: The first optical fiber length initial range, the second optical fiber length initial range, the first pump light ratio interval, and the second pump light ratio interval of the first-stage amplification structure and the second-stage amplification structure are set according to PMDWDM characteristic information combined with PMFM characteristic information; Optical fiber length regulation is performed in the first optical fiber length initial range until the double-wavelength signal power fluctuation is less than or equal to a threshold value, and a first optical fiber regulation length is obtained; According to the first optical fiber regulation length, pump light ratio regulation is performed in the pump light ratio interval until the signal-to-noise ratio is up to standard and the phase difference is within a preset phase difference threshold value, and a first regulation power ratio is obtained; Optical fiber length regulation is performed in the second optical fiber length initial range until the double-wavelength fusion degree is greater than a preset fusion threshold value, and a second optical fiber regulation length is obtained; According to the second optical fiber regulation length, pump light ratio regulation is performed in the pump light ratio interval until the bit error rate is less than or equal to a preset bit error rate threshold value, and a second regulation power ratio is obtained.

9. A design system for a high signal-to-noise ratio erbium-doped fiber amplifier, characterized by The system includes: A connection module is configured to connect an electrical system and an optical system by a pump light source to obtain a high signal-to-noise ratio erbium-doped fiber amplifier; The pump light source includes an LD, a thermistor, and a TEC; An electrical control module is configured to perform temperature error control and current supply on the pump light source by the electrical system; An optical control module is configured to perform two characteristic fusion processing and optimal regulation on an optical signal output by the pump light source by the optical system to obtain optimal regulation information; A current influence module is configured to acquire temperature error information and supply error information of the pump light source by the electrical system; The electrical system acquires temperature error information and supply error information of the pump light source, including: A temperature control part of the electrical system acquires actual temperature information of the pump light source by a thermistor of the pump light source; Set temperature information of the pump light source is acquired, and the temperature error information is acquired according to the actual temperature information combined with the set temperature information; Determine the required supply current information of the thermistor and TEC according to the temperature error information, and obtain a set supply current; Supply current to the thermistor and TEC according to the set supply current, and obtain an actual supply current; Obtain the absolute value of the difference between the set supply current and the actual supply current, and obtain supply error information; Obtain current fluctuation data during current supply; A temperature influence module is configured to obtain analog error information and adjustment error information according to the current fluctuation data; A fluctuation temperature influence module is configured to obtain a fluctuation current influence coefficient and a current temperature influence coefficient, and then obtain a fluctuation temperature influence coefficient, and adjust the current stability according to the fluctuation temperature influence coefficient.

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