Long-distance optical communication system pumping optimization device and method based on longitudinal power monitoring

Abstract

The invention provides a long-distance optical communication system pumping optimization device and method based on longitudinal power monitoring, and the device is characterized in that a laser, a first wavelength division multiplexer, a communication optical fiber, a second wavelength division multiplexer and a receiving end are sequentially connected, the first wavelength division multiplexer is connected with a forward Raman amplification unit, and the second wavelength division multiplexer is connected with a forward Raman amplification unit; the signal light is amplified twice at the two ends of the communication optical fiber through the forward Raman amplification unit and the backward Raman amplification unit, so that the signal-to-noise ratio of the signal light after the signal light passes through the long-distance communication optical fiber is ensured, and then the long-distance transmission of the signal light in a long-distance transmission scene is realized. After a receiving end obtains a longitudinal power distribution curve according to the signal light, parameter calibration is carried out on the forward Raman amplification unit and the backward Raman amplification unit, so that the accurate relation between the forward pump light and the longitudinal power distribution curve and between the backward pump light and the longitudinal power distribution curve is determined, and accurate optimization is conveniently achieved by adjusting the forward pump light and the backward pump light.

Description

Technical Field

[0001] The present invention relates to the technical field of optical signal transmission, and particularly to a pump optimization device and method for a long-distance optical communication system based on longitudinal power monitoring. Background Art

[0002] In the prior art, digital longitudinal monitoring (DLM) of an optical fiber link monitors the power information of an optical signal at different positions during transmission in the optical fiber, that is, the longitudinal power curve. Before the receiving end receives the corresponding optical signal, most signal amplification is performed on the signal optical signal based on the backward pump light on the receiving end side, so that the receiving end can receive the signal optical signal with a signal-to-noise ratio meeting the standard. However, the problem is that when the length of the communication optical fiber for transmitting the signal optical signal between the receiving end and the transmitting end is too long, the signal optical signal will cause a large amount of damage to the effective signal in the signal optical signal during transmission in the communication optical fiber, resulting in a very small signal-to-noise ratio when the signal optical signal reaches the receiving end side. On this basis, even if amplification is performed through the backward pump light, it is difficult for the receiving end to obtain the effective signal in the signal optical signal.

[0003] On the other hand, since the longitudinal power curve reflects the loss of the optical fiber link and the channel state, the transmission performance of the signal optical signal can be improved by adjusting the longitudinal power curve. However, it is currently difficult to accurately adjust the longitudinal power curve, resulting in the transmission performance of the signal optical signal being difficult to achieve the ideal effect.

[0004] In view of this, overcoming the defects of the prior art is an urgent problem to be solved in this technical field. Summary of the Invention

[0005] The technical problem to be solved by the present invention is how to detect and adjust the longitudinal power curve so as to improve the transmission performance of the signal optical signal.

[0006] The present invention adopts the following technical solutions:

[0007] In a first aspect, a pump optimization device for a long-distance optical communication system based on longitudinal power monitoring is provided, including: a laser 1, a first wavelength division multiplexer 2, a forward Raman amplification unit 3, a communication optical fiber 4, a second wavelength division multiplexer 5, a backward Raman amplification unit 6, and a receiving end 7, where:

[0008] The laser 1, the first wavelength division multiplexer 2, the communication optical fiber 4, the second wavelength division multiplexer 5, and the receiving end 7 are connected in sequence. The output end of the forward Raman amplification unit 3 is connected to the first wavelength division multiplexer 2, the input end of the forward Raman amplification unit 3 is connected to the receiving end 7, the output end of the backward Raman amplification unit 6 is connected to the second wavelength division multiplexer 5, and the input end of the backward Raman amplification unit 6 is connected to the receiving end 7;

[0009] The first wavelength division multiplexer 2 respectively receives the signal light from the laser 1 and the forward pump light from the forward Raman amplification unit 3, and uses the forward pump light to perform forward amplification on the signal light. The forward amplified signal light is transmitted to the second wavelength division multiplexer 5 through the communication optical fiber 4. The second wavelength division multiplexer 5 respectively receives the signal light and the backward pump light from the backward Raman amplification unit 6, and uses the backward pump light to perform backward amplification on the signal light. The receiving end 7 receives the backward amplified signal light;

[0010] The receiving end 7 is configured to obtain the longitudinal power distribution curve on the communication optical fiber 4 according to the received signal light, and perform parametric calibration on the forward Raman amplification unit 3 and the backward Raman amplification unit 6 according to the longitudinal power distribution curve, and adjust the parametrically calibrated forward Raman amplification unit 3 and backward Raman amplification unit 6 to achieve specified optimization of the longitudinal power distribution curve.

[0011] Preferably, the receiving end 7 is configured to obtain the longitudinal power distribution curve on the communication optical fiber 4 according to the received signal light, specifically including:

[0012] Perform total linear distortion compensation on the received signal light to obtain the signal light information after total linear compensation;

[0013] Perform data signal processing on the signal light information after total linear compensation to obtain the lossless signal light information at the transmitting end position;

[0014] Load the total linear distortion on the communication optical fiber 4 to the signal light information after total linear compensation to obtain the signal light information with complete linear distortion;

[0015] According to each position on the communication optical fiber 4, perform partial linear distortion compensation from the corresponding position to the receiving end 7 on the signal light information with complete linear distortion to obtain the signal light information after partial linear compensation at each position on the communication optical fiber 4;

[0016] Perform non-linear probe processing on the signal light information after partial linear compensation at each position to subtract the non-linear distortion at the corresponding position and perform remaining linear compensation to obtain the signal light information with non-linear information at each position;

[0017] Correlate the signal light information with non-linear information at each position with the lossless signal light information at the transmitting end position to obtain the longitudinal power distribution curve on the communication optical fiber 4.

[0018] Preferably, the parametric calibration of the forward Raman amplification unit 3 and the backward Raman amplification unit 6 according to the longitudinal power distribution curve specifically includes:

[0019] Establish a relationship model for the signal light, the forward pump light, and the backward pump light;

[0020] Obtain the theoretical longitudinal power information according to the relationship model;

[0021] Compare the actually measured longitudinal power distribution curve with the theoretical longitudinal power information, and iteratively optimize the parameters in the relationship model according to the comparison result until the actually measured longitudinal power distribution curve is consistent with the theoretical longitudinal power information calculated by the optimized relationship model. At this time, the parameters in the relationship model are the calibrated parameters.

[0022] Preferably, the establishment of the relationship model for the signal light, the forward pump light, and the backward pump light specifically includes:

[0023] The relationship model is:

[0024]

[0025] Among them, P s is the power of the signal light, α s is the loss of the signal light, ω s is the angular frequency of the signal light; is the power of the forward pump light, is the power of the backward pump light, is the loss of the forward pump light, is the loss of the backward pump light, is the angular frequency of the forward pump light, is the angular frequency of the backward pump light, g R (*) is the Raman gain coefficient.

[0026] Preferably, the realization of the specified optimization of the longitudinal power distribution curve by adjusting the forward Raman amplification unit 3 and the backward Raman amplification unit 6 after parameter calibration specifically includes:

[0027] Obtain one or more of the optical power of the forward pump light, the wavelength of the forward pump light, the optical power of the backward pump light, and the optical power wavelength of the forward pump light that need to be adjusted according to the optimization target;

[0028] Adjust one or more of the optical power of the forward pump light and the wavelength of the forward pump light corresponding to the adjustment of the forward Raman amplification unit 3 after parameter calibration, and adjust one or more of the optical power of the backward pump light and the wavelength of the backward pump light in the backward Raman amplification unit 6 after parameter calibration.

[0029] Preferably, the pump optimization device for a long-distance optical communication system based on longitudinal power monitoring further includes a modulator 8, a first amplifier 9, a second amplifier 10, and a coherent receiver 11, where:

[0030] The modulator 8 and the first amplifier 9 are sequentially arranged on the optical path between the laser 1 and the first wavelength division multiplexer 2; the modulator 8 is used to modulate the optical signal emitted by the laser 1, and the first amplifier 9 is used to amplify the modulated optical signal.

[0031] The second amplifier 10 and the coherent receiver 11 are sequentially arranged on the optical path between the second wavelength division multiplexer 5 and the receiving end 7; the second amplifier 10 is used to amplify the signal light from the second wavelength division multiplexer 5, and the coherent receiver is used to obtain the phase information in the signal light.

[0032] In a second aspect, a pumping optimization method for a long-distance optical communication system based on longitudinal power monitoring is provided, which is used for the pumping optimization device of the long-distance optical communication system based on longitudinal power monitoring, and includes:

[0033] The receiving end 7 obtains the longitudinal power distribution curve on the communication optical fiber 4 according to the received signal light;

[0034] Perform parametric calibration on the forward Raman amplification unit 3 and the backward Raman amplification unit 6 according to the longitudinal power distribution curve;

[0035] Adjust the parametrically calibrated forward Raman amplification unit 3 and backward Raman amplification unit 6 to achieve specified optimization of the longitudinal power distribution curve.

[0036] Preferably, the receiving end 7 obtains the longitudinal power distribution curve on the communication optical fiber 4 according to the received signal light, specifically including:

[0037] Perform total linear distortion compensation on the received signal light to obtain the signal light information after total linear compensation;

[0038] Perform data signal processing on the signal light information after total linear compensation to obtain the lossless signal light information at the transmitting end position;

[0039] Load the total linear distortion on the communication optical fiber 4 to the signal light information after total linear compensation to obtain the signal light information with complete linear distortion;

[0040] According to each position on the communication optical fiber 4, perform partial linear distortion compensation from the corresponding position to the receiving end 7 on the signal light information with complete linear distortion to obtain the signal light information after partial linear compensation at each position on the communication optical fiber 4;

[0041] Perform non-linear probe processing on the signal light information after partial linear compensation at each position to subtract the non-linear distortion at the corresponding position and perform remaining linear compensation to obtain the signal light information with non-linear information at each position.

[0042] Correlate the signal light information with non-linear information at each position with the lossless signal light information at the transmitting end position to obtain the longitudinal power distribution curve on the communication optical fiber 4.

[0043] Preferably, the parametric calibration of the forward Raman amplification unit 3 and the backward Raman amplification unit 6 according to the longitudinal power distribution curve specifically includes:

[0044] Establish a relationship model for the signal light, the forward pump light, and the backward pump light;

[0045] Obtain the theoretical longitudinal power information according to the relationship model;

[0046] Compare the actually measured longitudinal power distribution curve with the theoretical longitudinal power information, and iteratively optimize the parameters in the relationship model according to the comparison result until the actually measured longitudinal power distribution curve is consistent with the theoretical longitudinal power information calculated by the optimized relationship model. At this time, the parameters in the relationship model are the calibrated parameters.

[0047] Preferably, the specified optimization of the longitudinal power distribution curve by adjusting the forward Raman amplification unit 3 and the backward Raman amplification unit 6 after parametric calibration specifically includes:

[0048] Obtain one or more of the optical power of the forward pump light, the wavelength of the forward pump light, the optical power of the backward pump light, and the optical power wavelength of the forward pump light that need to be adjusted according to the optimization target;

[0049] Adjust one or more of the optical power of the forward pump light and the wavelength of the forward pump light in the forward Raman amplification unit 3 after parametric calibration, and adjust one or more of the optical power of the backward pump light and the wavelength of the backward pump light in the backward Raman amplification unit 6 after parametric calibration.

[0050] The present invention provides a pump optimization device and method for a long-distance optical communication system based on longitudinal power monitoring. Among them, a laser 1, a first wavelength division multiplexer 2, a communication optical fiber 4, a second wavelength division multiplexer 5, and a receiving end 7 are connected in sequence. The first wavelength division multiplexer 2 is also connected to a forward Raman amplification unit 3, and the second wavelength division multiplexer 5 is also connected to a backward Raman amplification unit 6. The signal light is amplified twice at both ends of the communication optical fiber 4 through the forward Raman amplification unit 3 and the backward Raman amplification unit 6 to ensure the signal-to-noise ratio of the signal light after passing through the long-distance communication optical fiber 4, and further realize the scenario of long-distance transmission. After the receiving end 7 obtains the longitudinal power distribution curve according to the signal light, the parameters of the forward Raman amplification unit 3 and the backward Raman amplification unit 6 are calibrated, so as to determine the accurate relationship between the forward pump light and the backward pump light and the longitudinal power distribution curve, so as to realize accurate optimization by adjusting the forward pump light and the backward pump light. Description of the Drawings

[0051] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the embodiments of the present invention. Obviously, the following described drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0052] Figure 1 It is a schematic diagram of a device of a pump optimization device for a long-distance optical communication system based on longitudinal power monitoring provided by an embodiment of the present invention;

[0053] Figure 2 It is a schematic diagram of a device of another pump optimization device for a long-distance optical communication system based on longitudinal power monitoring provided by an embodiment of the present invention;

[0054] Figure 3 It is a flowchart for obtaining the longitudinal power distribution curve in a pump optimization device for a long-distance optical communication system based on longitudinal power monitoring provided by an embodiment of the present invention;

[0055] Figure 4 It is a flowchart for obtaining the longitudinal power distribution curve in another pump optimization device for a long-distance optical communication system based on longitudinal power monitoring provided by an embodiment of the present invention;

[0056] Figure 5 It is a flowchart of a method in a pump optimization method for a long-distance optical communication system based on longitudinal power monitoring provided by an embodiment of the present invention;

[0057] Figure 6 It is a flowchart of a parameter calibration method in a pump optimization method for a long-distance optical communication system based on longitudinal power monitoring provided by an embodiment of the present invention;

[0058] Figure 7 It is a flowchart of the method for directional optimization in the pump optimization method of a long-distance optical communication system based on longitudinal power monitoring provided by an embodiment of the present invention;

[0059] Among them, the illustration numbers are as follows:

[0060] Laser 1; First wavelength division multiplexer 2; Forward Raman amplification unit 3; Communication optical fiber 4; Second wavelength division multiplexer 5; Backward Raman amplification unit 6; Receiver 7; Modulator 8; First amplifier 9; Second amplifier 10; Coherent receiver 11. Specific embodiments

[0061] In order to make the objectives, technical solutions and advantages of the present invention more clear and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0062] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present disclosure.

[0063] In the description of the present invention, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the embodiments of the present disclosure, unless otherwise specified, the meaning of "plurality" is two or more. In addition, for example, in the description, for the same type of nouns, the method of adding "A" and "B" at the end is used to describe them as two independent individuals. In this case, the features defined with "A" and "B" are only used for the purpose of distinguishing the same type of individuals and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features.

[0064] In the present invention, "about", "substantially" or "approximate" includes the stated value and the average value within an acceptable deviation range of the specific value, where the acceptable deviation range is determined by those of ordinary skill in the art considering the measurement being discussed and the errors associated with the measurement of the specific quantity, that is, the limitations of the measurement system.

[0065] Unless the context otherwise requires, throughout the specification and claims, the term "comprising" is to be construed in an open, inclusive sense, i.e., "including, but not limited to". In the description of the specification, terms such as "one embodiment", "some embodiments", "exemplary embodiments", "examples", "specific examples", or "some examples" are intended to indicate that specific features, structures, materials, or characteristics related to the embodiment or example are included in at least one embodiment or example of the present disclosure. The schematic representations of the above terms do not necessarily refer to the same embodiment or example. In addition, the specific features, structures, materials, or characteristics may be included in any one or more embodiments or examples in any appropriate manner, that is, although they may be carried in the embodiments or examples of the above terms due to reasons such as the order and position of appearance, but it is not limited that they can be carried by one embodiment or example in a combined manner.

[0066] In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0067] Embodiment 1:

[0068] The embodiment of the present invention provides a pump optimization device for a long-distance optical communication system based on longitudinal power monitoring, as Figure 1 shown, including: a laser 1, a first wavelength division multiplexer 2, a forward Raman amplification unit 3, a communication optical fiber 4, a second wavelength division multiplexer 5, a backward Raman amplification unit 6, and a receiving end 7, wherein:

[0069] The laser 1, the first wavelength division multiplexer 2, the communication optical fiber 4, the second wavelength division multiplexer 5, and the receiving end 7 are connected in sequence. The output end of the forward Raman amplification unit 3 is connected to the first wavelength division multiplexer 2, the input end of the forward Raman amplification unit 3 is connected to the receiving end 7, the output end of the backward Raman amplification unit 6 is connected to the second wavelength division multiplexer 5, and the input end of the backward Raman amplification unit 6 is connected to the receiving end 7.

[0070] The first wavelength division multiplexer 2 respectively receives the signal light from the laser 1 and the forward pump light from the forward Raman amplification unit 3, and uses the forward pump light to perform forward amplification on the signal light. The forward-amplified signal light is transmitted to the second wavelength division multiplexer 5 through the communication optical fiber 4. The second wavelength division multiplexer 5 respectively receives the signal light and the backward pump light from the backward Raman amplification unit 6, and uses the backward pump light to perform backward amplification on the signal light. The receiving end 7 receives the backward-amplified signal light.

[0071] In this embodiment, the communication optical fiber 4 serves as the transmission medium. In practical applications, the length of the communication optical fiber 4 is often relatively long. If the signal light is not amplified by the pump light before being transmitted to the communication optical fiber 4, then after the signal light undergoes long-distance transmission in the communication optical fiber 4 and reaches the opposite end, the signal-to-noise ratio of the signal light will become extremely small. At this time, even if it is amplified by the backward pump light, both the effective signal and the noise signal in the signal light will be amplified. In the case where the original signal-to-noise ratio is extremely small, the effective signal will be submerged, resulting in the inability to read the effective signal in the signal light. Correspondingly, if forward pump light amplification is performed before the signal light is transmitted to the communication optical fiber 4, both the effective signal and the noise signal in the signal light will be amplified. At this time, since the signal-to-noise ratio is relatively large and the proportion of the effective signal in the signal light is relatively large, the amount of the effective signal will become even larger after amplification. After the long-distance loss of the communication optical fiber 4, although a part of the effective signal will be lost and a part of the noise signal will be accumulated, the effective signal still accounts for a certain proportion in the signal light. After being amplified by the backward pump light, the effective signal in the signal light can be effectively extracted, completing the long-distance transmission of the signal light.

[0072] The receiving end 7 is configured to obtain the longitudinal power distribution curve on the communication optical fiber 4 based on the received signal light, and perform parameter calibration on the forward Raman amplification unit 3 and the backward Raman amplification unit 6 according to the longitudinal power distribution curve, and adjust the forward Raman amplification unit 3 and the backward Raman amplification unit 6 after parameter calibration to achieve specified optimization of the longitudinal power distribution curve.

[0073] In this embodiment, the longitudinal power distribution curve is the distribution curve formed by the power values at different positions on the communication optical fiber 4. In practical applications, it is necessary to adjust the longitudinal power distribution curve of the entire communication optical fiber 4 by adjusting the power and / or wavelength of the forward Raman amplification unit 3 and the backward Raman amplification unit 6. However, in actual situations, it is difficult to ensure the accuracy of the parameters in the relationship model between the power of the forward Raman amplification unit 3 and the backward Raman amplification unit 6 and the longitudinal power distribution curve. When substituting the power of the forward Raman amplification unit 3 and the backward Raman amplification unit 6 into this relationship model, there is a difference between the calculated theoretical longitudinal power distribution curve and the actual longitudinal power distribution curve. On this basis, if this relationship model is directly used to adjust and optimize the longitudinal power distribution curve, it cannot ensure the optimization that meets the expectations.

[0074] Therefore, it is necessary to first adjust the parameters in the relationship model. The parameter calibration is as follows: calibrate and adjust the parameters in the relationship model so that the theoretical longitudinal power distribution curve calculated by the relationship model after parameter calibration is basically the same as the actual longitudinal power distribution curve obtained by actual measurement, and the error between the two is within the allowable range of the user. Then, accurately optimize towards the expected target according to the relationship model after parameter calibration, such as adjusting the power flatness in the longitudinal power distribution curve, reducing the power at a specified position, etc., to avoid the situation where the adjustment effect does not meet the expectations.

[0075] It should be noted that in this embodiment, the pump optimization device for long-distance optical communication systems based on longitudinal power monitoring also requires the following basic devices to meet the basic functional requirements, such as Figure 2 as shown below:

[0076] The pump optimization device for long-distance optical communication systems based on longitudinal power monitoring further includes a modulator 8, a first amplifier 9, a second amplifier 10, and a coherent receiver 11, where: the modulator 8 and the first amplifier 9 are sequentially arranged on the optical path between the laser 1 and the first wavelength division multiplexer 2; the modulator 8 is used to modulate the optical signal emitted by the laser 1, and the first amplifier 9 is used to amplify the modulated optical signal; the second amplifier 10 and the coherent receiver 11 are sequentially arranged on the optical path between the second wavelength division multiplexer 5 and the receiving end 7; the second amplifier 10 is used to amplify the signal light from the second wavelength division multiplexer 5, and the coherent receiver is used to obtain the phase information in the signal light.

[0077] Furthermore, in this embodiment, since the receiving end 7 can only obtain the optical power at the position of the receiving end 7 when receiving the signal light and it is difficult to directly obtain the optical powers at different positions on the communication optical fiber 4 through the signal light, this embodiment also involves the following design:

[0078] The receiving end 7 is used to obtain the longitudinal power distribution curve on the communication optical fiber 4 according to the received signal light, as Figure 2 shown, and the method flow includes:

[0079] In step 101, the received signal light is subjected to total linear distortion compensation to obtain the signal light information after total linear compensation.

[0080] In this embodiment, the signal light is received by the receiving end 7 after passing through the device and the optical fiber link. The received signal light has linear distortion caused by dispersion and nonlinear distortion caused by nonlinearity, and both the linear distortion and the nonlinear distortion are accumulated on the communication optical fiber 4. The total linear distortion compensation is to compensate for all the linear distortions accumulated by the signal light on the communication optical fiber 4. The processing steps of the total linear distortion compensation include dispersion compensation processing and adaptive equalization processing. The dispersion compensation processing is used to compensate for most of the linear distortions on the communication optical fiber 4. The adaptive equalization processing is used to compensate for the residual linear distortions after the dispersion compensation processing. The linear distortion in the signal light information after the total linear compensation is close to the signal light emitted by the laser 1. The signal light information includes the amplitude and phase of the signal light. The purpose of step 101 is to restore the signal light received by the receiving end 7 to the state of the signal light at the transmitting end position from the perspective of linear distortion.

[0081] In step 102, data signal processing is performed on the signal light information after the total linear compensation to obtain lossless signal light information at the transmitting end position.

[0082] The data signal processing is used to perform nonlinear compensation on the signal light information after the total linear compensation, and to compensate for the nonlinear distortion in the signal light information after the total linear compensation, so as to restore the signal light to a state close to the lossless signal light emitted by the laser, which is the lossless signal light information at the transmitting end position.

[0083] It should be noted that the lossless signal light information at the transmitting end position needs to be modulo-processed in advance to remove the phase information therein and leave the amplitude information.

[0084] In step 103, the total linear distortion on the communication optical fiber 4 is loaded onto the signal light information after the total linear compensation to obtain signal light information with complete linear distortion.

[0085] The total linear distortion on the communication optical fiber 4 is the total dispersion amount corresponding to the total link length on the communication optical fiber 4, that is: C total = D * L, where D is the link dispersion value and L is the length of the communication optical fiber 4. By loading the total linear distortion onto the signal light information after the total linear compensation, the signal light information now contains the complete linear distortion on the total link length, making the linear distortion of the signal light restored to an approximate state of the signal light at the position of the receiving end 7, so as to facilitate the subsequent positioning of the signal light information at each position on the communication optical fiber 4.

[0086] In step 104, according to each position on the communication optical fiber 4, partial linear distortion compensation from the corresponding position to the receiving end 7 is performed on the signal light information with complete linear distortion to obtain signal light information with partial linear compensation at each position on the communication optical fiber 4.

[0087] After obtaining the signal light information with complete linear distortion, linear compensation is performed for each distance. That is, on the basis of the signal light information with complete linear distortion, the linear distortion of a part of the distance (i.e., the compensation of the partial linear distortion, i.e., the partial dispersion compensation process) is compensated, and the linear distortion in the signal light information is adjusted to the state at the corresponding position in the communication optical fiber 4, so as to obtain the signal light information after partial linear compensation, thereby realizing the positioning of each position on the communication optical fiber 4. For example, the length of the communication optical fiber 4 is 100 meters. In the order direction from the transmitting end position (i.e., the position of the laser 1) to the receiving end 7, the signal light information with complete linear distortion is: starting from the transmitting end position, the signal light information with 100 meters of linear distortion is accumulated. If you want to locate the signal light information at the 70-meter position, then on the basis of the signal light information with complete linear distortion, the linear distortion of 100 - 70 = 30 meters (i.e., the compensation of the partial linear distortion) is compensated, and the signal light information with 70 meters of linear distortion (i.e., the signal light information after partial linear compensation) can be obtained. According to the above method and reference example, the signal light information after partial linear compensation at each position on the communication optical fiber 4 can be obtained.

[0088] The corresponding formula is: C total = D * X, where D is the link dispersion value and X is the distance between the corresponding position and the receiving end 7.

[0089] In step 105, the signal light information after partial linear compensation at each position is subjected to a non-linear probe process to subtract the non-linear distortion at the corresponding position and perform the remaining linear compensation, so as to obtain the signal light information with non-linear information at each position.

[0090] It should be noted that, for the signal light information after partial linear compensation at each position, the nonlinear distortion therein is consistent. This is because the nonlinear distortion has not been compensated or adjusted in the aforementioned steps. Therefore, the nonlinear distortion in the signal light information after partial linear compensation at all positions is consistent with the partial linear distortion of the signal light at the receiving end 7. On this basis, the signal light information after partial linear compensation at each position is subjected to nonlinear probe processing, that is, only the nonlinear distortion corresponding to each position is compensated, and the nonlinear distortion at other positions on the communication optical fiber 4 is not compensated; after each position is processed by the nonlinear probe, the difference between them is the difference in the nonlinear distortion at the corresponding position. On the basis of the above, since the remaining linear distortion in the signal light information has completed the positioning function, in order to compare with the lossless transmitting signal light later, the remaining linear distortion in the signal light information at each position can be compensated, that is, the remaining linear compensation (that is, the remaining dispersion compensation processing), that is, the linear distortion between laser 1 and the corresponding position in the signal light information at each position is compensated. At this point, the linear distortion in the signal light information at each position is basically fully compensated, and the remaining nonlinear distortion in the signal light information after being processed by the nonlinear probe is the signal light information with nonlinear information at each position.

[0091] The formula for the nonlinear probe processing is:

[0092] φ=-γ*abs(A(x) 2 )*A(x);

[0093] Among them, φ is the nonlinear distortion, γ is the nonlinear coefficient, A(x) is the signal light information of signal light A at point x, abs(A(x) 2 ) is the power of signal light A at point x.

[0094] In order to explain the above steps clearly, the following examples are given:

[0095] The length of the communication optical fiber 4 is 100 meters, in the order of the transmitting position (i.e., the position of the laser 1) to the receiving end 7 position; the processing object is the signal light information after partial linear compensation at the 70-meter position. It should be noted that at this time, the signal light information contains complete nonlinear distortion and linear distortion from the transmitting position to the 70-meter position.

[0096] Perform non - linear probe processing on the signal optical information after partial linear compensation at the 70 - meter position, that is, compensate for the non - linear distortion at the 70 - meter position in the signal optical information; then compensate for the linear distortion from the transmitting end position to the 70 - meter position, that is, the remaining linear compensation, to obtain the signal optical information with non - linear information at the 70 - meter position. At this time, the linear distortion in the signal optical information with non - linear information is basically completely compensated, and the non - linear distortion part includes all non - linear distortions except those at the 70 - meter position.

[0097] It should be noted that it is necessary to perform modulo operation on the signal optical information with non - linear information at each position in advance to remove the phase information therein and leave the amplitude information.

[0098] In step 106, correlate the signal optical information with non - linear information at each position with the lossless signal optical information at the transmitting end position to obtain the longitudinal power distribution curve on the communication optical fiber 4.

[0099] Since the linear distortion and non - linear distortion in the lossless signal optical information at the transmitting end position are basically compensated, when correlating and comparing the signal optical information with non - linear information at each position with the lossless signal optical information at the transmitting end position, the obtained difference is: the non - linear distortion at each position; since the non - linear distortion is related to the power of the signal optical, the power of the signal optical at each position can be obtained according to the non - linear distortion at each position, which is the longitudinal power distribution curve.

[0100] It should be noted that in the prior art, usually a transmitting - end output pulse is used, and the scattered light reflected from different positions in the receiving optical fiber is used to determine the power at different positions in the optical fiber. This method requires an additional pulse laser and corresponding receiving equipment at the transmitting end. However, for the above - mentioned method adopted in this embodiment, only normal arithmetic processing of the signal optical received at the 7 - th position of the receiving end is required, without additional equipment. While accurately obtaining the longitudinal power distribution curve, the device cost is reduced.

[0101] Furthermore, in this embodiment, for the parameter calibration, the following design is involved:

[0102] Establish a relationship model among the signal optical, the forward pump optical, and the backward pump optical. Among them, the relationship model is as follows:

[0103]

[0104]

[0105] Among them, P s is the power of the signal optical, α s is the loss of the signal optical, ω sis the angular frequency of the signal light; is the power of the forward pump light, is the power of the backward pump light, is the loss of the forward pump light, is the loss of the backward pump light, is the angular frequency of the forward pump light, is the angular frequency of the backward pump light, g R (*) is the Raman gain coefficient.

[0106] The theoretical longitudinal power information is obtained according to the relationship model. That is, the forward Raman amplification unit 3 and the backward Raman amplification unit 6 are configured with corresponding powers, and the actual longitudinal power distribution curve is measured accordingly. At the same time, the corresponding powers are substituted into the relationship model to obtain the theoretical longitudinal power distribution curve.

[0107] The measured longitudinal power distribution curve is compared with the theoretical longitudinal power information, and the parameters in the relationship model are iteratively optimized according to the comparison result until the measured longitudinal power distribution curve is consistent with the theoretical longitudinal power information calculated by the optimized relationship model. At this time, the parameters in the relationship model are the calibrated parameters.

[0108] In this embodiment, the parameter for optimization iteration is α s 、ω s and ω p , and the others include: the powers of the forward pump light and the backward pump light and the losses α of the forward pump light and the backward pump light p are all variables. After calibrating the parameters α s 、ω s and ω p , according to the optimization target, the optical power of the forward pump light that needs to be adjusted is obtained the wavelength of the forward pump light, the optical power of the backward pump light and one or more of the optical power wavelengths of the forward pump light; for the forward Raman amplification unit 3 after parameter calibration, one or more of the optical power and the wavelength of the forward pump light are correspondingly adjusted, and for the backward Raman amplification unit 6 after parameter calibration, one or more of the optical power and the wavelength of the backward pump light are correspondingly adjusted, so as to achieve the specified optimization of the longitudinal power distribution curve.

[0109] Correspondingly, one or more of the optical power of the forward pump light to be adjusted, the wavelength of the forward pump light, the optical power of the backward pump light, and the optical power wavelength of the forward pump light are obtained according to the optimization objective; one or more of the optical power and the wavelength of the forward pump light in the forward Raman amplification unit 3 corresponding to the parameter calibration are adjusted, and one or more of the optical power and the wavelength of the backward pump light in the backward Raman amplification unit 6 after parameter calibration are adjusted.

[0110] Embodiment 2:

[0111] Further, on the basis of Embodiment 1, a pump optimization method for a long-distance optical communication system based on longitudinal power monitoring is provided, which is used for the pump optimization device of the long-distance optical communication system based on longitudinal power monitoring described in Embodiment 1, as Figure 5 shown, including:

[0112] In step 201, the receiving end 7 obtains the longitudinal power distribution curve on the communication optical fiber 4 according to the received signal light.

[0113] In step 202, the forward Raman amplification unit 3 and the backward Raman amplification unit 6 are calibrated according to the longitudinal power distribution curve.

[0114] In step 203, the forward Raman amplification unit 3 and the backward Raman amplification unit 6 after parameter calibration are adjusted to achieve specified optimization of the longitudinal power distribution curve.

[0115] In this embodiment, the longitudinal power distribution curve is a distribution curve composed of the power values at different positions on the communication optical fiber 4. In actual application, it is necessary to adjust the longitudinal power distribution curve of the entire communication optical fiber 4 by adjusting the power and / or wavelength of the forward Raman amplification unit 3 and the backward Raman amplification unit 6. However, in actual situations, it is difficult to ensure the accuracy of the parameters in the relationship model between the power of the forward Raman amplification unit 3 and the backward Raman amplification unit 6 and the longitudinal power distribution curve. When the power of the forward Raman amplification unit 3 and the backward Raman amplification unit 6 is brought into this relationship model, there is a difference between the calculated theoretical longitudinal power distribution curve and the actual longitudinal power distribution curve. On this basis, if this relationship model is directly used to adjust and optimize the longitudinal power distribution curve, it cannot ensure the optimization that meets the expectations.

[0116] Therefore, it is necessary to first adjust the parameters in the relationship model. The parameter calibration is as follows: calibrate and adjust the parameters in the relationship model so that the theoretical longitudinal power distribution curve calculated by the relationship model after parameter calibration is basically consistent with the actual longitudinal power distribution curve obtained by actual measurement, and the error between the two is within the allowable range of the user. Then, accurately optimize towards the expected target according to the relationship model after parameter calibration, such as adjusting the power flatness in the longitudinal power distribution curve, reducing the power at a specified position, etc., to avoid the situation where the adjustment effect does not meet the expectation.

[0117] Further, in this embodiment, since the receiving end 7 can only obtain the optical power at the position of the receiving end 7 when receiving the signal light, it is difficult to directly obtain the optical power at different positions on the communication optical fiber 4 through the signal light. Therefore, this embodiment also involves the following design:

[0118] The receiving end 7 is used to obtain the longitudinal power distribution curve on the communication optical fiber 4 according to the received signal light. The method process includes:

[0119] (1) Perform total linear distortion compensation on the received signal light to obtain the signal light information after total linear compensation.

[0120] In this embodiment, the signal light is received by the receiving end 7 after passing through the device and the optical fiber link. The received signal light has linear distortion caused by dispersion and nonlinear distortion caused by nonlinearity, and both the linear distortion and the nonlinear distortion are accumulated on the communication optical fiber 4; the total linear distortion compensation is: compensating for all the linear distortions accumulated by the signal light on the communication optical fiber 4; the processing steps of the total linear distortion compensation include: dispersion compensation processing and adaptive equalization processing; the dispersion compensation processing is used to compensate for most of the linear distortions on the communication optical fiber 4; the adaptive equalization processing is used to compensate for the residual linear distortions after the dispersion compensation processing; the linear distortion in the signal light information after total linear compensation is close to the signal light emitted by the laser 1. The signal light information includes the amplitude and phase of the signal light; the purpose of step (1) is to restore the signal light received by the receiving end 7 to the state of the signal light at the transmitting end position from the perspective of linear distortion.

[0121] (2) Perform data signal processing on the signal light information after total linear compensation to obtain the lossless signal light information at the transmitting end position.

[0122] The data signal processing is used to perform nonlinear compensation on the signal light information after total linear compensation, and is used to compensate for the nonlinear distortion in the signal light information after total linear compensation, so as to restore the signal light to a state close to the lossless signal light emitted by the laser, that is, the lossless signal light information at the transmitting end position.

[0123] It should be noted that the lossless signal optical information at the originating position needs to be modulo-processed in advance to remove the phase information therein and leave the amplitude information.

[0124] (3) Load the total linear distortion on the communication optical fiber 4 to the signal optical information after the total linear compensation to obtain the signal optical information with complete linear distortion.

[0125] The total linear distortion on the communication optical fiber 4 is the total dispersion amount corresponding to the total link length on the communication optical fiber 4, that is: C total = D * L, where D is the link dispersion value and L is the length of the communication optical fiber 4; by loading the total linear distortion to the signal optical information after the total linear compensation, the signal optical information now contains the complete linear distortion on the total link length, making the linear distortion of the signal optical restore to the signal optical state approximately at the position of the receiving end 7, so as to facilitate the subsequent positioning of the signal optical information at each position on the communication optical fiber 4.

[0126] (4) Compensate the partial linear distortion from the corresponding position to the receiving end 7 for the signal optical information with complete linear distortion according to each position on the communication optical fiber 4 to obtain the signal optical information with partial linear compensation at each position on the communication optical fiber 4.

[0127] After obtaining the signal optical information with complete linear distortion, perform linear compensation for each distance, that is, on the basis of the signal optical information with complete linear distortion, compensate for the linear distortion of a part of the distance, that is, the compensation of the partial linear distortion, and adjust the linear distortion in the signal optical information to the state at the corresponding position in the communication optical fiber 4 to obtain the signal optical information with partial linear compensation, so as to realize the positioning of each position on the communication optical fiber 4; for example, the length of the communication optical fiber 4 is 100 meters, in the order direction from the originating position (i.e., the position of the laser 1) to the receiving end 7 position, the signal optical information with complete linear distortion is: starting from the originating position, the signal optical information with 100 meters of linear distortion accumulated. If you want to locate the signal optical information at the 70-meter position, then on the basis of the signal optical information with complete linear distortion, compensate for the linear distortion of 100 - 70 = 30 meters (i.e., the compensation of the partial linear distortion), and you can obtain the signal optical information with 70 meters of linear distortion accumulated (i.e., the signal optical information with partial linear compensation). According to the above method and reference example, the signal optical information with partial linear compensation at each position on the communication optical fiber 4 can be obtained.

[0128] The corresponding formula is: C total = D * X, where D is the link dispersion value and X is the distance between the corresponding position and the receiving end 7.

[0129] (5) Performing nonlinear probe processing on the signal light information after partial linear compensation at each position to subtract the nonlinear distortion at the corresponding position, and performing residual linear compensation to obtain the signal light information with nonlinear information at each position.

[0130] It should be noted that, for the signal light information after partial linear compensation at each position, the nonlinear distortion therein is consistent. This is because the nonlinear distortion has not been compensated or adjusted in the aforementioned steps. Therefore, the nonlinear distortion in the signal light information after partial linear compensation at all positions is consistent with the partial linear distortion of the signal light at the receiving end 7. On this basis, the signal light information after partial linear compensation at each position is subjected to nonlinear probe processing, that is, only the nonlinear distortion corresponding to each position is compensated, and the nonlinear distortion at other positions on the communication optical fiber 4 is not compensated; after each position is processed by the nonlinear probe, the difference between them is the difference in the nonlinear distortion at the corresponding position. On the basis of the above, since the remaining linear distortion in the signal light information has completed the positioning function, in order to compare with the lossless transmitting signal light later, the remaining linear distortion in the signal light information at each position can be compensated, that is, the remaining linear compensation, that is, the linear distortion between laser 1 and the corresponding position in the signal light information at each position is compensated. At this point, the linear distortion in the signal light information at each position is basically fully compensated, and the remaining nonlinear distortion in the signal light information after being processed by the nonlinear probe is the signal light information with nonlinear information at each position.

[0131] The formula for the nonlinear probe processing is:

[0132] φ=-γ*abs(A(x) 2 )*A(x);

[0133] Among them, φ is the nonlinear distortion, γ is the nonlinear coefficient, A(x) is the amplitude and phase of the signal light A at point x, and abs(*) is the amplitude of the signal light A at different positions on the communication optical fiber 4.

[0134] In order to explain the above steps clearly, the following examples are given:

[0135] The length of the communication optical fiber 4 is 100 meters, in the order of the transmitting position (i.e., the position of the laser 1) to the receiving end 7 position; the processing object is the signal light information after partial linear compensation at the 70-meter position. It should be noted that at this time, the signal light information contains complete nonlinear distortion and linear distortion from the transmitting position to the 70-meter position.

[0136] Perform non - linear probe processing on the signal optical information after partial linear compensation at the 70 - meter position, that is, compensate for the non - linear distortion at the 70 - meter position in the signal optical information; then compensate for the linear distortion from the transmitting end position to the 70 - meter position, that is, the remaining linear compensation, to obtain the signal optical information with non - linear information at the 70 - meter position. At this time, the linear distortion in the signal optical information with non - linear information is basically fully compensated, and the non - linear distortion part includes all non - linear distortions except those at the 70 - meter position.

[0137] It should be noted that it is necessary to perform modulo operation on the signal optical information with non - linear information at each position in advance to remove the phase information therein and leave the amplitude information.

[0138] (6) Correlate the signal optical information with non - linear information at each position with the lossless signal optical information at the transmitting end position to obtain the longitudinal power distribution curve on the communication optical fiber 4.

[0139] Since the linear distortion and non - linear distortion in the lossless signal optical information at the transmitting end position are basically fully compensated, when correlating and comparing the signal optical information with non - linear information at each position with the lossless signal optical information at the transmitting end position, the obtained difference is: the non - linear distortion at each position; since the non - linear distortion is related to the power of the signal optical, the power of the signal optical at each position can be obtained according to the non - linear distortion at each position, which is the longitudinal power distribution curve.

[0140] Furthermore, perform parametric calibration on the forward Raman amplification unit 3 and the backward Raman amplification unit 6 according to the longitudinal power distribution curve, as Figure 6 shown, the method process includes:

[0141] In step 301, establish a relationship model of the signal optical, forward pump optical, and backward pump optical.

[0142] Among them, the relationship model is as follows:

[0143]

[0144] Among them, P s is the power of the signal optical, α s is the loss of the signal optical, ω s is the angular frequency of the signal optical; is the power of the forward pump optical and the backward pump optical, where is the power of the forward pump optical, is the power of the backward pump optical, α p is the loss of the forward pump optical and the backward pump optical, ω p is the angular frequency of the forward pump optical and the backward pump optical, gR (ω p , ω s ) is the Raman gain coefficient.

[0145] In step 302, the theoretical longitudinal power information is obtained according to the relationship model.

[0146] Configure corresponding powers for the forward Raman amplification unit 3 and the backward Raman amplification unit 6, measure the actual longitudinal power distribution curve accordingly, and at the same time substitute the corresponding powers into the relationship model to obtain the theoretical longitudinal power distribution curve.

[0147] In step 303, compare the actually measured longitudinal power distribution curve with the theoretical longitudinal power information, and iteratively optimize the parameters in the relationship model according to the comparison result until the actually measured longitudinal power distribution curve is consistent with the theoretical longitudinal power information calculated by the optimized relationship model. At this time, the parameters in the relationship model are the calibrated parameters.

[0148] In this embodiment, the parameters for optimization iteration are α s , ω s and ω p , and others include: the powers of the forward pump light and the backward pump light and the losses α p of the forward pump light and the backward pump light are all variables. After calibrating the parameters α s , ω s and ω p , obtain the optical power of the forward pump light that needs to be adjusted according to the optimization target the wavelength of the forward pump light, the optical power of the backward pump light and one or more of the optical power wavelengths of the forward pump light; correspondingly adjust one or more of the optical power and the wavelength of the forward pump light for the forward Raman amplification unit 3 after parameter calibration, and correspondingly adjust one or more of the optical power and the wavelength of the backward pump light for the backward Raman amplification unit 6 after parameter calibration, then the specified optimization of the longitudinal power distribution curve can be achieved.

[0149] Further, the specified optimization of the longitudinal power distribution curve is achieved by adjusting the forward Raman amplification unit 3 and the backward Raman amplification unit 6 after parameter calibration, as Figure 7 shown, the method flow includes:

[0150] In step 401, obtain one or more of the optical power of the forward pump light that needs to be adjusted, the wavelength of the forward pump light, the optical power of the backward pump light, and the optical power wavelength of the forward pump light according to the optimization target.

[0151] In step 402, one or more of the optical power and wavelength of the forward pump light in the forward Raman amplification unit 3 after parameter calibration are adjusted, and one or more of the optical power and wavelength of the backward pump light in the backward Raman amplification unit 6 after parameter calibration are adjusted.

[0152] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A pump optimization device for a long-distance optical communication system based on longitudinal power monitoring, characterized in that Comprising: A laser (1), a first wavelength division multiplexer (2), a forward Raman amplification unit (3), a communication optical fiber (4), a second wavelength division multiplexer (5), a backward Raman amplification unit (6), and a receiving end (7), wherein: The laser (1), the first wavelength division multiplexer (2), the communication optical fiber (4), the second wavelength division multiplexer (5), and the receiving end (7) are connected in sequence. The output end of the forward Raman amplification unit (3) is connected to the first wavelength division multiplexer (2), the input end of the forward Raman amplification unit (3) is connected to the receiving end (7), the output end of the backward Raman amplification unit (6) is connected to the second wavelength division multiplexer (5), and the input end of the backward Raman amplification unit (6) is connected to the receiving end (7); The first wavelength division multiplexer (2) respectively receives the signal light from the laser (1) and the forward pump light from the forward Raman amplification unit (3), and performs forward amplification on the signal light through the forward pump light. The forward amplified signal light is transmitted to the second wavelength division multiplexer (5) through the communication optical fiber (4). The second wavelength division multiplexer (5) respectively receives the signal light and the backward pump light from the backward Raman amplification unit (6), and performs backward amplification on the signal light through the backward pump light. The receiving end (7) receives the backward amplified signal light; The receiving end (7) is configured to obtain the longitudinal power distribution curve on the communication optical fiber (4) according to the received signal light, and perform parameter calibration on the forward Raman amplification unit (3) and the backward Raman amplification unit (6) according to the longitudinal power distribution curve, and adjust the forward Raman amplification unit (3) and the backward Raman amplification unit (6) after parameter calibration to achieve specified optimization of the longitudinal power distribution curve.

2. The pump optimization device for a long-distance optical communication system based on longitudinal power monitoring according to claim 1, wherein The receiving end (7) is configured to obtain the longitudinal power distribution curve on the communication optical fiber (4) according to the received signal light, specifically including: Performing total linear distortion compensation on the received signal light to obtain the signal light information after total linear compensation; Performing data signal processing on the signal light information after total linear compensation to obtain the lossless signal light information at the transmitting end position; Loading the total linear distortion on the communication optical fiber (4) to the signal light information after total linear compensation to obtain the signal light information with complete linear distortion; According to each position on the communication optical fiber (4), performing partial linear distortion compensation from the corresponding position to the receiving end (7) on the signal light information with complete linear distortion to obtain the signal light information with partial linear compensation at each position on the communication optical fiber (4); Performing non-linear probe processing on the signal light information with partial linear compensation at each position to subtract the non-linear distortion at the corresponding position and perform remaining linear compensation to obtain the signal light information with non-linear information at each position; Correlating the signal light information with non-linear information at each position with the lossless signal light information at the transmitting end position to obtain the longitudinal power distribution curve on the communication optical fiber (4).

3. The pump optimization device for a long-distance optical communication system based on longitudinal power monitoring according to claim 1, wherein The performing parameter calibration on the forward Raman amplification unit (3) and the backward Raman amplification unit (6) according to the longitudinal power distribution curve specifically includes: Establish a relationship model for the signal light, the forward pump light, and the backward pump light; Obtain the theoretical longitudinal power information according to the relationship model; Compare the actually measured longitudinal power distribution curve with the theoretical longitudinal power information, and iteratively optimize the parameters in the relationship model according to the comparison result until the actually measured longitudinal power distribution curve is consistent with the theoretical longitudinal power information calculated by the optimized relationship model. At this time, the parameters in the relationship model are the calibrated parameters.

4. The pump optimization device for a long-distance optical communication system based on longitudinal power monitoring according to claim 3, wherein The establishment of the relationship model for the signal light, the forward pump light, and the backward pump light specifically includes: The relationship model is: Among them, P s is the power of the signal light, α s is the loss of the signal light, ω s is the angular frequency of the signal light; is the power of the forward pump light, is the power of the backward pump light, is the loss of the forward pump light, is the loss of the backward pump light, is the angular frequency of the forward pump light, is the angular frequency of the backward pump light, g R (*) is the Raman gain coefficient.

5. The pump optimization device for a long-distance optical communication system based on longitudinal power monitoring according to claim 1, wherein The specific implementation of achieving specified optimization of the longitudinal power distribution curve by adjusting the calibrated forward Raman amplification unit (3) and backward Raman amplification unit (6) includes: Obtain one or more of the optical power of the forward pump light, the wavelength of the forward pump light, the optical power of the backward pump light, and the optical power wavelength of the forward pump light that need to be adjusted according to the optimization target; Adjust one or more of the optical power of the forward pump light and the wavelength of the forward pump light corresponding to the adjustment of the calibrated forward Raman amplification unit (3), and adjust one or more of the optical power of the backward pump light and the wavelength of the backward pump light in the calibrated backward Raman amplification unit (6).

6. The pump optimization device for a long-distance optical communication system based on longitudinal power monitoring according to claim 1, wherein The pump optimization device for a long-distance optical communication system based on longitudinal power monitoring further includes a modulator (8), a first amplifier (9), a second amplifier (10), and a coherent receiver (11), where: The modulator (8) and the first amplifier (9) are sequentially arranged on the optical path between the laser (1) and the first wavelength division multiplexer (2); the modulator (8) is used to modulate the optical signal emitted by the laser (1), and the first amplifier (9) is used to amplify the modulated optical signal; The second amplifier (10) and the coherent receiver (11) are sequentially arranged on the optical path between the second wavelength division multiplexer (5) and the receiving end (7); the second amplifier (10) is used to amplify the signal light from the second wavelength division multiplexer (5), and the coherent receiver is used to obtain the phase information in the signal light.

7. A pump optimization method for a long - distance optical communication system based on longitudinal power monitoring, which is applied to the pump optimization device of the long - distance optical communication system based on longitudinal power monitoring as described in any one of claims 1 - 6, characterized in that, It includes: The receiving end (7) obtains the longitudinal power distribution curve on the communication optical fiber (4) according to the received signal light; Perform parameter calibration on the forward Raman amplification unit (3) and the backward Raman amplification unit (6) according to the longitudinal power distribution curve; Adjust the calibrated forward Raman amplification unit (3) and backward Raman amplification unit (6) to achieve specified optimization of the longitudinal power distribution curve.

8. The method for optimizing the pump of a long-distance optical communication system based on longitudinal power monitoring according to claim 7, wherein The specific implementation of the receiving end (7) obtaining the longitudinal power distribution curve on the communication optical fiber (4) according to the received signal light includes: Perform total linear distortion compensation on the received signal light to obtain the signal light information after total linear compensation; Perform data signal processing on the signal light information after total linear compensation to obtain the lossless signal light information at the transmitting end position; Load the total linear distortion on the communication optical fiber (4) for the signal light information after total linear compensation to obtain the signal light information with complete linear distortion; According to each position on the communication optical fiber (4), perform partial linear distortion compensation from the corresponding position of the complete linearly distorted signal optical information to the receiving end (7) to obtain the signal optical information with partial linear compensation at each position on the communication optical fiber (4); Perform non-linear probe processing on the signal optical information with partial linear compensation at each position to subtract the non-linear distortion at the corresponding position and perform residual linear compensation to obtain the signal optical information with non-linear information at each position; Correlate the signal optical information with non-linear information at each position with the lossless signal optical information at the transmitting end position to obtain the longitudinal power distribution curve on the communication optical fiber (4).

9. The pump optimization method for long - distance optical communication systems based on longitudinal power monitoring according to claim 7, characterized in that, The parametric calibration of the forward Raman amplification unit (3) and the backward Raman amplification unit (6) according to the longitudinal power distribution curve specifically includes: Establish a relationship model of the signal optical, forward pump optical, and backward pump optical; Obtain the theoretical longitudinal power information according to the relationship model; Compare the actually measured longitudinal power distribution curve with the theoretical longitudinal power information, and iteratively optimize the parameters in the relationship model according to the comparison result until the actually measured longitudinal power distribution curve is consistent with the theoretical longitudinal power information calculated by the optimized relationship model. At this time, the parameters in the relationship model are the calibrated parameters.

10. The pump optimization method for a long-distance optical communication system based on longitudinal power monitoring according to claim 7, characterized in that, The realization of specified optimization of the longitudinal power distribution curve by adjusting the forward Raman amplification unit (3) and the backward Raman amplification unit (6) after parametric calibration specifically includes: Obtain one or more of the optical power of the forward pump optical, the wavelength of the forward pump optical, the optical power of the backward pump optical, and the optical power wavelength of the forward pump optical that need to be adjusted according to the optimization target; Adjust one or more of the optical power of the forward pump optical and the wavelength of the forward pump optical in the forward Raman amplification unit (3) after parametric calibration, and adjust one or more of the optical power of the backward pump optical and the wavelength of the backward pump optical in the backward Raman amplification unit (6) after parametric calibration.

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