A wavelength division multiplexing automatic high signal-to-noise ratio configuration system and method

Abstract

The application discloses a kind of automatic high signal-to-noise ratio configuration system and method of wavelength division multiplexing, the system includes n sites, the first site in optical transmission direction is equipped with power amplifier, each site is equipped with optical amplifier and variable optical attenuator in the rest, NF configuration parameter memory is further equipped in each site, the NF configuration parameter memory in the first site is used to store the gain and noise figure of power amplifier in this site, and the relationship data of input power and noise figure of this site, the NF configuration parameter memory in the rest each site is used to store the gain and noise figure of optical amplifier in corresponding site, the gain and noise figure of variable optical attenuator, and the relationship data of input power and noise figure of this site.The application can automatically configure optimal parameter, so that the overall noise figure NF of system is minimum, so as to reach high signal-to-noise ratio, so that the system based on WDM works in the best state, reduces error rate.

Description

Technical Field

[0001] This invention relates to the field of optical communication technology, and specifically to an automatic high signal-to-noise ratio configuration system and method for wavelength division multiplexing. Background Technology

[0002] In current high-capacity optical communication transmission systems based on WDM (Wavelength Division Multiplexing), multiple sites are cascaded using optical amplifier boards based on EDFA (Erbium Doped Fiber Amplifier) ​​or other amplification principles to amplify service optical signals for long-distance transmission. This requires configuring numerous parameters at each site, ensuring parameter matching, and necessitates long distances between sites. During long-distance transmission, the optical signal carrying service information experiences increased noise at each transmission path and site, leading to an increase in the Noise Figure (NF). Furthermore, after multiple transmissions, the accumulated NF gradually reduces the Signal-to-Noise Ratio (SNR), resulting in an increased bit error rate, or necessitating the use of additional electrical repeaters to restore a high SNR.

[0003] For example, CN114205047A discloses an automatic configuration method and apparatus for an optical multiplexer section. This method involves acquiring the input power of a booster amplifier (BA); setting the gain of the BA; and adjusting the VOA (Variable Optical Attenuator) of the BA based on its input power and gain to ensure that the single-wavelength output power of the BA is within a specific range. The method also involves acquiring the output optical power of the BA and the input optical power of a preamplifier (PA); obtaining the first line loss from the BA to the PA based on the output optical power of the BA and the input optical power of the PA; setting the VOA of the PA such that the sum of the first line loss and the VOA of the PA equals a first design value; and setting the gain of the PA accordingly. The process involves obtaining the output optical power of the BA (Balance Array); obtaining the input optical power of the LA (Line Amplifier); obtaining the second line loss from the BA to the LA based on the output optical power of the BA and the input optical power of the LA; setting the VOA of the LA so that the sum of the second line loss and the VOA of the LA equals a second design value; and setting the gain of the LA. This configuration method uses a step-by-step gain setting approach, only controlling the input or output power range of the optical signal to ensure it remains within the design value range. It does not consider related parameters such as NF (Noise, Flux, and Ambient Transmission) during optical transmission, and lacks automatic noise calculation and related configuration methods. This prevents the system from achieving the optimal signal-to-noise ratio, leading to an increase in the bit error rate during transmission. Therefore, how to achieve an automatic, high-performance parameter configuration mechanism has become a key research focus for those skilled in the art. Summary of the Invention

[0004] To address the aforementioned shortcomings of existing technologies, the technical problem this invention aims to solve is: how to provide an automatic high signal-to-noise ratio configuration system and method for wavelength division multiplexing that can automatically configure optimal parameters to minimize the overall system noise figure NF, thereby achieving a high signal-to-noise ratio, ensuring the system operates in its optimal state, and reducing the bit error rate.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] An automatic high signal-to-noise ratio (SNR) configuration system for wavelength division multiplexing (WDM) includes n stations. Optical signals are transmitted between two adjacent stations. A power amplifier is installed in the first station along the optical transmission direction, and optical amplifiers and variable optical attenuators are installed in each of the remaining stations. An NF configuration parameter memory is also installed in each station. The NF configuration parameter memory in the first station along the optical transmission direction is used to store the relationship between the gain and noise figure of the power amplifier in that station, as well as the relationship between the input power and noise figure of that station. The NF configuration parameter memories in the remaining stations are used to store the relationship between the gain and noise figure of the optical amplifier in that station, the relationship between the gain and noise figure of the variable optical attenuator, and the relationship between the input power and noise figure of that station.

[0007] Preferably, the site includes two end stations and multiple line stations located between the two end stations. The end station at the beginning of the optical transmission direction is the first end station, and the end station at the end of the optical transmission direction is the last end station. The first end station is equipped with a power amplifier to amplify the input light before transmitting it to the adjacent line station. The last end station is equipped with a variable optical attenuator and a preamplifier sequentially along the optical transmission direction to receive the optical signal from the adjacent line station, amplify it, and output it. Optical signals are transmitted sequentially between the multiple line stations, and each line station is equipped with a line station variable optical attenuator and a line optical amplifier along the optical transmission direction. The NF configuration parameter memory in the first terminal station is used to store the relationship data between the gain and noise figure of the power amplifier and the input power and noise figure of the first terminal station. The NF configuration parameter memory in the last terminal station is used to store the relationship data between the gain and noise figure of the preamplifier, the gain and noise figure of the last variable optical attenuator, and the input power and noise figure of the last terminal station. The NF configuration parameter memory in the line station is used to store the relationship data between the gain and noise figure of the line optical amplifier, the gain and noise figure of the line station variable optical attenuator, and the input power and noise figure of the line station.

[0008] An automatic high signal-to-noise ratio (SNR) configuration method for wavelength division multiplexing (WDM), employing the aforementioned automatic high SNR configuration system for WDM, includes:

[0009] Step 1) Set a gain for the power amplifier at the first station so that the input power P at the power amplifier is... in1 The output after amplification by the power amplifier is within the output range set by the power amplifier.

[0010] Step 2) Read the input power P at the variable optical attenuator in the second site adjacent to the first site. in2 ;

[0011] Step 3) Obtain the gain G of the power amplifier in the first site based on the data stored in the NF configuration parameter memory in the first site and the data stored in the NF configuration parameter memory in the second site. OA1 The gain G of the optical amplifier at the second site OA2 and the gain G of the variable optical attenuator in the second site VOA2 ;

[0012] Step 4) Configure the gains calculated in Step 3) to the corresponding stations.

[0013] Preferably, the NF configuration parameter memory within the first site stores the gain G of the power amplifier. OA1 The relationship between the noise figure NF and the input power P of the site in1 The relationship data with the noise figure NF, and the NF configuration parameter memory in the second site stores the gain G of the optical amplifier. OA2 The relationship between the noise figure NF and the gain G of the variable optical attenuator VOA2 The relationship between the noise figure NF and the input power P of the site in2 Data relating to the noise figure NF;

[0014] Step 3) includes the following steps:

[0015] Step 3.1) Based on the data stored in the NF configuration parameter memory in the first site and the data stored in the NF configuration parameter memory in the second site, fit G. OA1 -NF, P in1 -NF, P in2 -NF, G VOA2 -NF and G OA2 -NF multi-order curves, where G OA1 P in1 P in2 G VOA2 and G OA2 The values ​​are all within the set range;

[0016] Step 3.2) G OA1 -NF, P in1 -NF, G OA2 G is obtained by superposition of multi-order curves in -NF. OA1 P in1 and G OA2 The multivariate functional relationship between the three and NF;

[0017] Step 3.3) According to G VOA2 P in2 With P in1 and GOA1 The relationship between G VOA2 P in2 The NF values ​​of both are added to the multivariate functional relationship in step 3.2) to obtain the result from P. in1 G OA1 and G OA2 NF functions controlled by the three factors;

[0018] Step 3.4) Combine the input power P from step 1). in1 In step 3.3), the optimal solution for the current noise figure NF is obtained from the multivariate functional relationship, and the corresponding P is obtained at this time. in1 G OA1 and G OA2 The optimal value of the three, and according to G VOA2 With P in1 and G OA1 The relationship leads to the conclusion that G is at this time. VOA2 The optimal value.

[0019] Preferred, P in2 With P in1 and G OA1 The relation is:

[0020] P in2 = P in1 * G OA1 - NF LINE1 ;

[0021] Where: NF LINE1 The NF parameters for the fiber optic line and other passive optical devices between the first and second sites;

[0022] G VOA2 With P in1 and G OA1 The relation is:

[0023] G VOA2 = a*( P in1 * G OA1 )+b;

[0024] In the formula: a is the coefficient term of the relationship, and b is the constant term.

[0025] Preferably, the formula for calculating the noise figure NF between the first and second stations is:

[0026] NF=NF OA1 +NF LINE1 +NF VOA2 +NF OA2 ;

[0027] Where: NF OA1For the NF parameters of the power amplifier in the first site;

[0028] NF LINE1 The NF parameters for the fiber optic line and other passive optical devices between the first and second sites;

[0029] NF VOA2 For the NF parameters of the variable optical attenuator in the second site;

[0030] NF OA2 For the NF parameters of the optical amplifier in the second site.

[0031] Preferably, in step 4), the gain G of the power amplifier in the first site calculated in step 3) is... OA1 Transmitted to the first station via OSC (Optical Supervisory Channel).

[0032] Preferably, the method further includes the gain G of the optical amplifier at the i-th site. OAi and the gain G of the variable optical attenuator VOAi The configuration method, where 3≤i≤n and i is an integer, includes the following steps:

[0033] Step S1) Read the input power P before the variable optical attenuator in the current site. ini；

[0034] Step S2) Obtain the gain G of the optical amplifier at the current site based on the data stored in the NF configuration parameter memory at the current site. OAi and the gain G of the variable optical attenuator VOAi ;

[0035] Step S3) Configure the gains calculated in step S2) into the current site.

[0036] Preferably, the NF configuration parameter memory in the i-th site stores the gain G of the optical amplifier. OAi The relationship between the noise figure NF and the gain G of the variable optical attenuator VOAi Data relating to noise figure NF and input power P ini Data relating to the noise figure NF;

[0037] Step S2 includes the following steps:

[0038] Step S2.1) Fit P based on the data stored in the NF configuration parameter memory within the current site. ini -NF, G VOAi -NF and G OAi -NF multi-order curves, where P iniG VOAi and G OAi The values ​​are all within the set range;

[0039] Step S2.2) P ini -NF, G VOAi -NF and G OAi -NF's multi-order curves are obtained by superposition to obtain P. ini G VOAi and G OAi The multivariate functional relationship between the three and NF;

[0040] Step S2.3) Combined with the input power P in step S1) ini In step S2.2), the optimal solution for the current noise figure NF is obtained from the multivariate functional relationship, and the corresponding G is obtained at this time. VOAi and G OAi The optimal value for both.

[0041] Preferably, the formula for calculating the noise figure NF of the i-th station is:

[0042] NF=NF LINEi +NF VOAi +NF OAi ;

[0043] Where: NF LINEi For the fiber optic line and other passive optical devices between the i-th station and the previous station;

[0044] NF VOAi Let be the NF parameters of the variable optical attenuator within the i-th site;

[0045] NF OAi Let be the NF parameters of the optical amplifier in the i-th site.

[0046] Compared with the prior art, the present invention has the following advantages:

[0047] 1. This invention stores the relationship data between the gain of the optical amplifier, the gain of the variable optical attenuator, and the input power and the noise figure NF in the NF configuration parameter memory of each site in advance. Based on the stored data, the corresponding multi-order curves are fitted, and further functional relationships between the gain of the optical amplifier, the gain of the variable optical attenuator, and the input power and the noise figure NF are obtained from the fitted multi-order curves. Then, based on the obtained input power, the optimal solution of the noise figure NF is obtained on the functional relationship, and the gain of the optical amplifier and the gain of the variable optical attenuator of each site are further obtained. The calculated optimal gains are then configured in the corresponding sites. By automatically configuring the optimal gains of each site, the system can achieve a high signal-to-noise ratio.

[0048] 2. This invention automatically configures the optimal parameters to minimize the overall noise figure NF of the system, thereby achieving a high signal-to-noise ratio, enabling the system to operate in its best state, and reducing the bit error rate.

[0049] 3. The automatic configuration method of this invention can improve configuration efficiency, solve the problem of low efficiency in finding the best working state during manual configuration, and also reduce the error between manual configuration and optimal configuration. Attached Figure Description

[0050] Figure 1 This is a system connection block diagram of the automatic high signal-to-noise ratio configuration system for wavelength division multiplexing of the present invention;

[0051] Figure 2 This is a flowchart of the configuration method at the first and second stations in the automatic high signal-to-noise ratio configuration method for wavelength division multiplexing of the present invention.

[0052] Figure 3 This is a flowchart of the configuration method at each of the remaining stations in the automatic high signal-to-noise ratio configuration method for wavelength division multiplexing of the present invention. Detailed Implementation

[0053] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the described embodiments of the present invention without creative effort are within the scope of protection of the present invention. Unless otherwise defined, the technical or scientific terms used herein should have the ordinary meaning understood by those skilled in the art to which this invention pertains.

[0054] The terms "first," "second," and similar words used in the specification and claims of this patent application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, unless the context clearly indicates otherwise, the singular forms of "an," "a," or "the," etc., do not indicate a quantity limitation, but rather indicate the presence of at least one. Terms such as "comprising" or "including" mean that the element or object preceding "comprising" encompasses the features, integrals, steps, operations, elements, and / or components listed following "comprising" or "including," and do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or collections thereof. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; these relative positional relationships may change accordingly when the absolute position of the described object changes.

[0055] As attached Figure 1 As shown, an automatic high signal-to-noise ratio (SNR) configuration system for wavelength division multiplexing includes n stations. Optical signals are transmitted between any two adjacent stations. In practical use, the transmission direction can be from west to east (i.e., adjacent stations). Figure 1 The direction from left to right (in the middle) can also be from east to west (i.e., attached). Figure 1 The configuration is the same for both transmission directions (from right to left). In this specific embodiment, the transmission direction from west to east is used for description. The first station along the optical transmission direction is equipped with a power amplifier (BA), and each of the remaining stations is equipped with an optical amplifier and a variable optical attenuator (VOA). The nth station along the optical transmission direction is equipped with a preamplifier (PA), and the remaining stations are equipped with line amplifiers (LA). Each station also has an NF configuration parameter memory. The NF configuration parameter memory in the first station along the optical transmission direction stores the relationship between the gain and noise figure of the power amplifier in that station, as well as the relationship between the input power and noise figure of that station. The NF configuration parameter memories in the remaining stations store the relationship between the gain and noise figure of the optical amplifier, the relationship between the gain and noise figure of the variable optical attenuator, and the relationship between the input power and noise figure of that station.

[0056] In this embodiment, the site includes two end stations and multiple line stations located between the two end stations. The end station at the beginning of the optical transmission direction is called the beginning end station, and the end station at the end of the optical transmission direction is called the end end station. A power amplifier is provided in the beginning end station to amplify the input light before transmitting it to the adjacent line station. An end variable optical attenuator and a preamplifier are sequentially provided in the end station along the optical transmission direction to receive the optical signal from the adjacent line station, amplify it, and output it. Optical signals are transmitted sequentially between the multiple line stations, and each line station is equipped with a line station variable optical attenuator and a line optical amplifier along the optical transmission direction. The NF configuration parameter memory in the first-end station is used to store the relationship data between the gain and noise figure of the power amplifier and the input power and noise figure of the first-end station. The NF configuration parameter memory in the last-end station is used to store the relationship data between the gain and noise figure of the preamplifier, the gain and noise figure of the last-end variable optical attenuator, and the input power and noise figure of the last-end station. The NF configuration parameter memory in the line station is used to store the relationship data between the gain and noise figure of the line optical amplifier, the gain and noise figure of the line station variable optical attenuator, and the input power and noise figure of the line station.

[0057] As attached Figure 2 As shown, an automatic high signal-to-noise ratio (SNR) configuration method for wavelength division multiplexing (WDM) employs the aforementioned automatic high SNR configuration system for WDM, comprising:

[0058] Step 1) Set a gain for the power amplifier BA at the first station so that the input power P at the power amplifier is... in1 The output after amplification by the power amplifier is within the output range set by the power amplifier.

[0059] Step 2) Read the input power P at the variable optical attenuator (VOA) in the second site adjacent to the first site. in2 ;

[0060] Step 3) Obtain the gain G of the power amplifier BA in the first site based on the data stored in the NF configuration parameter memory in the first site and the data stored in the NF configuration parameter memory in the second site. OA1 The gain G of the optical amplifier LA at the second site OA2 and the gain G of the variable optical attenuator (VOA) at the second site VOA2 ;

[0061] Step 4) Configure the gains calculated in Step 3) to the corresponding stations.

[0062] In this embodiment, the NF configuration parameter memory within the first site stores the power amplifier gain G. OA1 The relationship between the noise figure NF and the input power P of the site in1 The data relating to the noise figure NF, and the NF configuration parameter memory within the second site stores the gain G of the optical amplifier. OA2 Relationship data with noise figure NF, and gain G of variable optical attenuator VOA2 The relationship between the noise figure NF and the input power P of the site in2 Data relating to the noise figure NF;

[0063] Step 3) includes the following steps:

[0064] Step 3.1) Based on the data stored in the NF configuration parameter memory in the first site and the data stored in the NF configuration parameter memory in the second site, fit G. OA1 -NF, P in1 -NF, P in2 -NF, G VOA2 -NF and G OA2 -NF multi-order curves, where G OA1 P in1 P in2 G VOA2 and G OA2 The values ​​are all within the set range;

[0065] Step 3.2) G OA1 -NF, Pin1 -NF, G OA2 G is obtained by superposition of multi-order curves in -NF. OA1 P in1 and G OA2 The multivariate functional relationship between the three and NF;

[0066] Step 3.3) According to G VOA2 P in2 With P in1 and G OA1 The relationship between G VOA2 P in2 The NF values ​​of both are added to the multivariate functional relationship in step 3.2) to obtain the result from P. in1 G OA1 and G OA2 NF functions controlled by the three factors;

[0067] Step 3.4) Combine the input power P from step 1). in1 In step 3.3), the optimal solution for the current noise figure NF is obtained from the multivariate functional relationship, and the corresponding P is obtained at this time. in1 G OA1 and G OA2 The optimal value of the three, and according to G VOA2 With P in1 and G OA1 The relationship leads to the conclusion that G is at this time. VOA2 The optimal value.

[0068] In this embodiment, P in2 With P in1 and G OA1 The relation is:

[0069] P in2 = P in1 * G OA1 - NF LINE1 ;

[0070] Where: NF LINE1 The NF parameters for the fiber optic line and other passive optical devices between the first and second sites;

[0071] G VOA2 With P in1 and G OA1 The relation is:

[0072] G VOA2 = a*( P in1 * G OA1 )+b;

[0073] In the formula: a is the coefficient term of the relationship, and b is the constant term.

[0074] In this embodiment, the formula for calculating the noise figure NF between the first and second stations is as follows:

[0075] NF=NF OA1 +NF LINE1 +NF VOA2 +NF OA2 ;

[0076] Where: NF OA1 For the NF parameters of the power amplifier in the first site;

[0077] NF LINE1 The NF parameters for the fiber optic line and other passive optical devices between the first and second sites;

[0078] NF VOA2 For the NF parameters of the variable optical attenuator in the second site;

[0079] NF OA2 For the NF parameters of the optical amplifier in the second site.

[0080] In this embodiment, in step 4), the gain G of the power amplifier in the first site calculated in step 3) is... OA1 The data is transmitted to the first station via the optical supervisory channel (OSC).

[0081] As attached Figure 3 As shown, in this embodiment, the method further includes the gain G of the optical amplifier in the i-th site. OAi and the gain G of the variable optical attenuator VOAi The configuration method is as follows, where 3≤i≤n and i is an integer. Subsequent stations are adjusted step by step to prioritize ensuring a high signal-to-noise ratio for the preceding stations. The specific steps include:

[0082] Step S1) Read the input power P before the variable optical attenuator in the current site. ini；

[0083] Step S2) Obtain the gain G of the optical amplifier at the current site based on the data stored in the NF configuration parameter memory at the current site. OAi and the gain G of the variable optical attenuator VOAi ;

[0084] Step S3) Configure the gains calculated in step S2) into the current site.

[0085] In this embodiment, the NF configuration parameter memory in the i-th site stores the gain G of the optical amplifier. OAiRelationship data with noise figure NF, gain G of variable optical attenuator VOAi Data relating to noise figure NF and input power P ini Data relating to the noise figure NF;

[0086] Step S2 includes the following steps:

[0087] Step S2.1) Fit P based on the data stored in the NF configuration parameter memory within the current site. ini -NF, G VOAi -NF and G OAi -NF multi-order curves, where P ini G VOAi and G OAi The values ​​are all within the set range;

[0088] Step S2.2) P ini -NF, G VOAi -NF and G OAi -NF's multi-order curves are obtained by superposition to obtain P. ini G VOAi and G OAi The multivariate functional relationship between the three and NF;

[0089] Step S2.3) Combined with the input power P in step S1) ini In step S2.2), the optimal solution for the current noise figure NF is obtained from the multivariate functional relationship, and the corresponding G is obtained at this time. VOAi and G OAi The optimal values ​​for both.

[0090] In this embodiment, the formula for calculating the noise figure NF of the i-th station is:

[0091] NF=NF LINEi +NF VOAi +NF OAi ;

[0092] Where: NF LINEi This refers to the NF parameters of the fiber optic line and other passive optical devices between the i-th station and the previous station; once the hardware is determined, this value is fixed.

[0093] NF VOAi Let be the NF parameters of the variable optical attenuator within the i-th site;

[0094] NF OAi Let be the NF parameters of the optical amplifier in the i-th site.

[0095] Compared with existing technologies, this invention stores the relationship data between the gain of the optical amplifier, the gain of the variable optical attenuator, and the input power and the noise figure (NF) of each site in the NF configuration parameter memory beforehand. Based on the stored data, corresponding multi-order curves are fitted, and further, the functional relationship between the gain of the optical amplifier, the gain of the variable optical attenuator, and the input power and the noise figure (NF) is obtained from the fitted multi-order curves. Then, based on the obtained input power, the optimal solution for the noise figure (NF) is obtained on the functional relationship, and the gain of the optical amplifier and the gain of the variable optical attenuator at each site is further obtained. The calculated optimal gains are then configured to the corresponding sites. By automatically configuring the optimal gains for each site, the system can achieve a high signal-to-noise ratio (SNR). This invention achieves a high SNR by automatically configuring the optimal parameters, minimizing the overall system noise figure (NF), ensuring the system operates in its optimal state, and reducing the bit error rate. The automatic configuration method of this invention improves configuration efficiency, solves the inefficiency problem of manually finding the optimal operating state, and also reduces the error between manual configuration and the optimal configuration.

[0096] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit the technical solutions. Those skilled in the art should understand that any modifications or equivalent substitutions to the technical solutions of the present invention without departing from the spirit and scope of the present invention should be covered within the scope of the claims of the present invention.

Claims

1. An automatic high signal-to-noise ratio configuration system for wavelength division multiplexing, characterized in that, The system comprises n stations, with optical signal transmission between adjacent stations. The first station along the optical transmission direction contains a power amplifier, and each of the remaining stations contains an optical amplifier and a variable optical attenuator. Each station also contains an NF configuration parameter memory. The NF configuration parameter memory in the first station along the optical transmission direction stores data on the relationship between the gain and noise figure of the power amplifier at that station, as well as data on the relationship between the input power and noise figure of that station. The NF configuration parameter memories in the remaining stations store data on the relationship between the gain and noise figure of the optical amplifier at that station, the relationship between the gain and noise figure of the variable optical attenuator, and the relationship between the input power and noise figure of that station.

2. The automatic high signal-to-noise ratio configuration system for wavelength division multiplexing according to claim 1, characterized in that, The site includes two terminal stations and multiple line stations located between the two terminal stations. The terminal station at the beginning of the optical transmission direction is called the beginning terminal station, and the terminal station at the end of the optical transmission direction is called the end terminal station. A power amplifier is installed in the beginning terminal station to amplify the input light before transmitting it to the adjacent line station. An end terminal station is equipped with an end variable optical attenuator and a preamplifier sequentially along the optical transmission direction to receive the optical signal from the adjacent line station, amplify it, and output it. Optical signals are transmitted sequentially between the multiple line stations, and each line station is equipped with a line station variable optical attenuator and a line optical amplifier along the optical transmission direction. The NF configuration parameter memory in the first-end station is used to store the relationship data between the gain and noise figure of the power amplifier and the input power and noise figure of the first-end station. The NF configuration parameter memory in the last-end station is used to store the relationship data between the gain and noise figure of the preamplifier, the gain and noise figure of the last-end variable optical attenuator, and the input power and noise figure of the last-end station. The NF configuration parameter memory in the line station is used to store the relationship data between the gain and noise figure of the line optical amplifier, the gain and noise figure of the line station variable optical attenuator, and the input power and noise figure of the line station.

3. An automatic high signal-to-noise ratio configuration method for wavelength division multiplexing, characterized in that, The automatic high signal-to-noise ratio configuration system for wavelength division multiplexing as described in claim 1 includes: Step 1) Set a gain for the power amplifier at the first station so that the input power P at the power amplifier is... in1 The output after amplification by the power amplifier is within the output range set by the power amplifier. Step 2) Read the input power P at the variable optical attenuator in the second site adjacent to the first site. in2 ; Step 3) Obtain the gain G of the power amplifier in the first site based on the data stored in the NF configuration parameter memory in the first site and the data stored in the NF configuration parameter memory in the second site. OA1 The gain G of the optical amplifier at the second site OA2 and the gain G of the variable optical attenuator in the second site VOA2 ; Step 4) Configure the gains calculated in Step 3) to the corresponding stations.

4. The automatic high signal-to-noise ratio configuration method for wavelength division multiplexing according to claim 3, characterized in that, The NF configuration parameter memory within the first site stores the gain G of the power amplifier. OA1 The relationship between the noise figure NF and the input power P of the site in1 The relationship data with the noise figure NF, and the NF configuration parameter memory in the second site stores the gain G of the optical amplifier. OA2 The relationship between the noise figure NF and the gain G of the variable optical attenuator VOA2 The relationship between the noise figure NF and the input power P of the site in2 Data relating to the noise figure NF; Step 3) includes the following steps: Step 3.1) Based on the data stored in the NF configuration parameter memory in the first site and the data stored in the NF configuration parameter memory in the second site, fit G. OA1 -NF, P in1 -NF, P in2 -NF, G VOA2 -NF and G OA2 -NF multi-order curves, where G OA1 P in1 P in2 G VOA2 and G OA2 The values ​​are all within the set range; Step 3.2) G OA1 -NF, P in1 -NF, G OA2 G is obtained by superposition of multi-order curves in -NF. OA1 P in1 and G OA2 The multivariate functional relationship between the three and NF; Step 3.3) According to G VOA2 P in2 With P in1 and G OA1 The relationship between G VOA2 P in2 The NF values ​​of both are added to the multivariate functional relationship in step 3.2) to obtain the result from P. in1 G OA1 and G OA2 NF functions controlled by the three factors; Step 3.4) Combine the input power P from step 1). in1 In step 3.3), the optimal solution for the current noise figure NF is obtained from the multivariate functional relationship, and the corresponding P is obtained at this time. in1 G OA1 and G OA2 The optimal value of the three, and according to G VOA2 With P in1 and G OA1 The relationship leads to the conclusion that G is at this time. VOA2 The optimal value.

5. The automatic high signal-to-noise ratio configuration method for wavelength division multiplexing according to claim 4, characterized in that, P in2 With P in1 and G OA1 The relation is: P in2 = P in1 * G OA1 - NF LINE1 ; Where: NF LINE1 The NF parameters for the fiber optic line and other passive optical devices between the first and second sites; G VOA2 With P in1 and G OA1 The relation is: G VOA2 = a*( P in1 * G OA1 )+b; In the formula: a is the coefficient term of the relationship, and b is the constant term.

6. The automatic high signal-to-noise ratio configuration method for wavelength division multiplexing according to claim 3, characterized in that, The formula for calculating the noise figure NF between the first and second stations is: NF=NF OA1 +NF LINE1 +NF VOA2 +NF OA2 ; Where: NF OA1 For the NF parameters of the power amplifier in the first site; NF LINE1 The NF parameters for the fiber optic line and other passive optical devices between the first and second sites; NF VOA2 For the NF parameters of the variable optical attenuator in the second site; NF OA2 For the NF parameters of the optical amplifier in the second site.

7. The automatic high signal-to-noise ratio configuration method for wavelength division multiplexing according to claim 3, characterized in that, In step 4), the gain G of the power amplifier in the first site, calculated in step 3), is... OA1 The data is transmitted to the first station via an optical monitoring channel.

8. The automatic high signal-to-noise ratio configuration method for wavelength division multiplexing according to claim 3, characterized in that, The method also includes the gain G of the optical amplifier at the i-th site. OAi and the gain G of the variable optical attenuator VOAi The configuration method, where 3≤i≤n and i is an integer, includes the following steps: Step S1) Read the input power P before the variable optical attenuator in the current site. ini ; Step S2) Obtain the gain G of the optical amplifier at the current site based on the data stored in the NF configuration parameter memory at the current site. OAi and the gain G of the variable optical attenuator VOAi ; Step S3) Configure the gains calculated in step S2) into the current site.

9. The automatic high signal-to-noise ratio configuration method for wavelength division multiplexing according to claim 8, characterized in that, The NF configuration parameter memory in the i-th site stores the gain G of the optical amplifier. OAi The relationship between the noise figure NF and the gain G of the variable optical attenuator VOAi The relationship between the noise figure (NF) and the input power (P) ini Data relating to the noise figure NF; Step S2 includes the following steps: Step S2.1) Fit P based on the data stored in the NF configuration parameter memory within the current site. ini -NF, G VOAi -NF and G OAi -NF multi-order curves, where P ini G VOAi and G OAi The values ​​are all within the set range; Step S2.2) P ini -NF, G VOAi -NF and G OAi -NF's multi-order curves are obtained by superposition to obtain P. ini G VOAi and G OAi The multivariate functional relationship between the three and NF; Step S2.3) Combined with the input power P in step S1) ini In step S2.2), the optimal solution for the current noise figure NF is obtained from the multivariate functional relationship, and the corresponding G is obtained at this time. VOAi and G OAi The optimal values ​​for both.

10. The automatic high signal-to-noise ratio configuration method for wavelength division multiplexing according to claim 8, characterized in that, The formula for calculating the noise figure NF of the i-th station is: NF=NF LINEi +NF VOAi +NF OAi ; Where: NF LINEi For the fiber optic line and other passive optical devices between the i-th station and the previous station; NF VOAi Let be the NF parameters of the variable optical attenuator within the i-th site; NF OAi Let be the NF parameters of the optical amplifier in the i-th site.

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