CN100505591C - Optical add-drop multiplexer ring network multiplexing section power optimization method and system - Google Patents

Abstract

The invention discloses an OADM looped network multiplexing section power optimization method and system, which is characterized by the following: every element location consists of VOA and OA which connect to upstream optical section; the OA connects downstream optical section; every element location connects control device. The invention comprises the following methods: monitoring whether looped network state satisfies constraint condition; making sure of the adjusting OA and VOA and regulating variable according to the gain reduction of optical section, looped network total gain reduction, differences of respective constraint condition if the looped network state doesn't satisfy the constraint condition, variable range of optical section downstream node corresponding OA and OVA; making looped network total gain reduction satisfy the constraint condition; executing adjusting OA and OVA and regulating variable; optimizing looped network.

Description

Optical add-drop multiplexer ring network multiplexing section power optimization method and system

technical field

The invention relates to WDM optical transmission equipment in the field of communication, in particular to a method and system for power optimization of the multiplexing section of an OADM (optical add-drop multiplexer) ring network.

Background technique

In the WDM system applied in the urban optical transmission network, OADM equipment is widely used to form an OADM ring network. The gain and loss of the OADM ring network include the loss of the OADM device in the node, the gain of the upstream node OA (optical amplifier), the loss of the optical fiber line and the gain of the downstream node OA. Among them, the gain of the upstream node OA compensates the loss of the OADM device in the node, and the loss of the OADM device is stable. Therefore, the gain of the upstream node OA can be adjusted to compensate for the loss of the OADM device during equipment debugging, and there is no need to consider changes during equipment operation. In this way, during the operation of the equipment, the change of the gain and loss of the ring network is mainly determined by the change of the optical fiber line loss and the gain of the downstream node OA.

When the optical fiber line conditions change (aging, temperature, etc.), the line loss will deviate, and the gain of the ring network may be greater than the loss, or may be less than the loss.

When the gain and loss ratio of the ring network is too small, the OSNR (optical signal-to-noise ratio) and optical power of the ring network will deteriorate, and in extreme cases, the system will generate bit errors.

In the OADM ring network, the existence of protected wavelengths, idle wavelengths, or the inconsistency between the bandwidth of the OADM device and the central wavelength causes some wavelength leakage (such as the bandwidth of the band-stop filter and the band-pass filter, the inconsistency of the central wavelength, in the band-stop filter wavelengths outside the bandwidth of the band-stop filter, but still within the bandwidth of the band-pass filter, will leak). These wavelengths are directly connected to each point of the ring network, and the loop is composed of OADM devices, optical amplifiers and optical fiber transmission links. When the total gain of the loop is greater than the total loss, the noise of the optical amplifier is continuously amplified in the network, which may form a self-contained Oscillation will seriously affect the network work. In the OADM ring network shown in Figure 1, the wavelengths that pass through at each point will form a loop in the ring network. If the total gain formed by the optical amplifier is greater than the total loss inside the optical fiber line and the OADM node, the network may produce Self-excited.

Therefore, in the OADM ring network, when the optical fiber line conditions change (aging, temperature, etc.), the power of the optical multiplexing section (OMS) of the OADM ring network must be controlled to control the gain and loss of the ring network within an appropriate range.

At present, there are methods and devices for avoiding the self-excitation of the OADM ring network alone, and there are also network element-level power optimization methods established on the link, but there is no way to control the optical power of the ring network to suppress the self-excitation of the ring network. It is also a method to make the gain and loss of the ring network within a suitable range.

Contents of the invention

The problem to be solved by the present invention is to provide a power optimization method and system for the multiplexing section of the optical add-drop multiplexer ring network, which can not only avoid the deterioration of the OSNR and power of the ring network, but also prevent the ring network from generating self-excitation.

In order to solve the above-mentioned technical problems, the present invention provides a power optimization method for the multiplexing section of an optical add-drop multiplexer ring network, which is applied to each optical multiplexing section. The upstream node has a corresponding optical amplifier OA, and the downstream node has a corresponding OA and optical attenuator. In the system of VOA, the method includes the following steps:

(a) monitor the input and output power of the amplifier in each network element of the ring network, calculate the gain attenuation sum of each optical multiplexing section and the total gain attenuation sum of the ring network;

(b) Judging whether the calculated gain attenuation sum of each optical multiplexing section and the total gain attenuation sum of the ring network are within the range specified by the ring network constraint conditions, if satisfied, perform step (a), otherwise, perform step (c) ;

(c) Determine the OA and VOA to be adjusted and their adjustments according to the gain attenuation sum of each optical multiplexing section and the difference between the total gain attenuation sum of the ring network and their respective constraints, as well as the adjustment range of the downstream nodes of the optical multiplexing section corresponding to OA and VOA , so that the total gain of the ring network is attenuated and the constraints are satisfied;

(d) Issue and execute the OA and VOA to be adjusted and their adjustments, so that the ring network can be optimized.

Further, the above method can also have the following characteristics: when calculating the gain attenuation sum of a certain optical multiplexing section in the step (a), it is to subtract the output optical power of the monitored upstream node of the optical multiplexing section corresponding to the OA by its It is obtained by adding the input optical power of the downstream node corresponding to the OA, plus the gain of the downstream node corresponding to the OA, or subtracting the output optical power of the upstream node corresponding to the OA from the output optical power of the downstream node corresponding to the OA; ring network The total gain attenuation sum is obtained by adding the gain attenuation sums of the optical multiplexing sections of the ring network.

Further, the above-mentioned method can also have the following characteristics: in the ring network constraints in the step (b), the requirements for the gain attenuation and _Mi of each optical multiplexing section are: C1≤M _i≤0 ,; for the total gain of the ring network The requirements for the attenuation and M are: C2≤M<0; among them, C1 and C2 are preset constants less than 0, and the requirements for the total gain attenuation and M of the ring network are more prioritized.

Further, the above method can also have the following characteristics: said step (c) further includes the following steps:

(c1) According to the adjustment range corresponding to OA and VOA of the downstream nodes of the optical multiplexing section, calculate the gain attenuation of each optical multiplexing section that does not satisfy the constraints and the attainable value that is closest to a set standard value;

(c2) Add the attainable value of the gain attenuation sum of each optical multiplexing section that needs to be adjusted and the detected value of the gain attenuation sum of each optical multiplexing section that does not need to be adjusted, and compare it with the constraint condition of the total gain attenuation sum of the ring network, such as satisfying the condition , then the final value of the corresponding optical multiplexing section gain attenuation and adjustment is used as the attainable value, and step (c4) is executed, and if the condition is not satisfied, step (c3) is executed;

(c3) fine-tune the attainable value or detection value of the gain attenuation sum of each optical multiplexing section of the ring network, so that the total gain attenuation of the ring network meets the constraint conditions, and use the fine-tuned value as the gain attenuation and adjustment of each optical multiplexing section final value;

(c4) Distribute the difference between the current value and the final value of the gain attenuation sum of each optical multiplexing section, that is, the adjustment amount, to the corresponding OA and/or VOA of the downstream node, and end.

Furthermore, the above method may also have the following characteristics: the standard value in the step (c1) is selected from the range specified by the optical multiplexing section gain attenuation and constraints.

Further, the above method can also have the following characteristics: the step (c1) is further divided into the following steps:

(c11) Start with a certain network element, start processing from the first optical multiplexing section, judge its gain attenuation and whether it meets the constraint conditions in turn, and when the first optical multiplexing section that does not meet the constraint conditions is found, execute Next step;

(c12) According to the adjustment range of OA and VOA corresponding to the downstream node of the current optical multiplexing section, select a standard value from the range specified by the constraint conditions, and calculate the gain attenuation of the optical multiplexing section and the reachability closest to the standard value that can be achieved value;

(c13) Judging whether the gain attenuation of the optical multiplexing section and the attainable value of M _i meet the constraint condition: C1≤M _i≤0 , if satisfied, perform step (c17), otherwise perform step (c14);

(c14) judge whether the gain attenuation of the optical multiplexing section and the reachable value of _Mi are greater than zero, if so, perform step (c15), otherwise, perform step (c16);

(c15) If the upstream optical multiplexing section has not been processed, the difference between the value closest to _Mi in the range specified by the constraint condition minus the reachable value of the current optical multiplexing section Mi is used as the deviation value, and is assigned to the upstream optical multiplexing section, and executed step (c17);

(c16) If the downstream optical multiplexing section has not been processed, the difference between the value closest to _Mi in the range specified by the constraints minus the reachable value of the current optical multiplexing section _{Mi is} used as the deviation value, and allocated to the downstream optical multiplexing section;

(c17) judge whether each optical multiplexing section of the ring network has been processed, if so, perform step (c2), otherwise, the next optical multiplexing section is the current multiplexing section, and perform step (c18);

(c18) Judging whether the current optical multiplexing section is allocated with a deviation value, if so, the sum of the offset adjustment values allocated by other optical multiplexing sections is used as the standard value, and the gain attenuation sum of the optical multiplexing section is calculated to be the closest to the standard The reachable value of the value, return to step (c13), if no deviation value is assigned, execute (c19);

(c19) Judging whether the gain attenuation sum of the optical multiplexing section satisfies the constraint condition, if so, no adjustment is required, and step (c17) is executed; otherwise, return to step (c12).

Further, the above-mentioned method can also have the following characteristics: when fine-tuning the attainable values or detected values of the gain attenuation sum of each optical multiplexing section in the step (c3), those attainable values or detected values that meet the constraint conditions are given priority The gain attenuation of the optical multiplexing section with room for adjustment is adjusted to the direction that meets the total gain attenuation and constraint conditions of the ring network; out of condition, or to replace the OA and/or VOA.

Further, the above method can also have the following characteristics: when the adjustment amount of the gain attenuation sum of the optical multiplexing section is distributed in the step (c4), when the gain attenuation sum is to be increased, the attenuation of the VOA is preferentially reduced, and then the attenuation of the VOA is increased. Large OA gain; when you want to reduce the gain attenuation sum, first reduce the OA gain, and then increase the VOA attenuation.

Further, the above-mentioned method may also have the following characteristics: in the step (d), when sorting the delivery of the adjustment quantities of the OA and VOA to be adjusted, the first round of delivery is prioritized so that the total gain of the ring network Decay and tend to meet the constraints or maintain the adjustments that meet the constraints. If there are still adjustments that have not been issued, they will continue to be issued in the second round according to the principle of priority.

Further, the above method can also have the following characteristics: in the step (d), the adjustment amount issued to a certain OA or VOA does not exceed a set unit step size, and if it cannot be issued at one time, it will be issued in multiple rounds. hair.

The optical add-drop multiplexer ring network multiplexing section power optimization system provided by the present invention includes each network element connected through the optical multiplexing section, and each network element includes an adjustable optical attenuator VOA connected with the upstream optical multiplexing section and a The optical amplifier OA connected to the VOA, and the OA connected to the downstream optical multiplexing section, and each network element is connected to a control device, and the control device further includes a monitoring module, a control module and an execution module, wherein:

The monitoring module is connected to the OA in each network element, used to monitor the input and output power of each OA, and output to the control module;

The control module is used for monitoring the input and output power of each OA, calculating the gain attenuation sum of each optical multiplexing section and the total gain attenuation sum of the ring network, and judging whether it is within the range specified by the respective ring network constraints , if not satisfied, according to the difference between the gain attenuation sum of each optical multiplexing section and the total gain attenuation sum of the ring network and the constraint conditions, and the adjustment range of the downstream nodes of each optical multiplexing section corresponding to OA and VOA, determine the OA and VOA to be adjusted and their adjustment amount;

The execution module is connected with the OA and VOA in each network element, and is used for issuing and executing the OA and VOA to be adjusted and the adjustment value determined by the control module.

Further, the above system can also have the following features: the control module further includes a gain attenuation and calculation unit, an adjustment judgment unit and an adjustment amount calculation unit:

The gain attenuation and calculation unit includes: a first calculation subunit, which is used to calculate the difference between the output optical power of the upstream node corresponding to the OA and the input optical power of the downstream node corresponding to the OA for each optical multiplexing section, plus the corresponding OA of the downstream node The gain of the optical multiplexing section is to obtain the gain and attenuation sum of the optical multiplexing section; the second calculation subunit is used to add the obtained gain and attenuation sum of each optical multiplexing section in the ring network to obtain the total gain attenuation sum of the ring network;

Adjusting the judgment unit, used to compare the gain attenuation sum of each optical multiplexing section of the ring network and the total gain attenuation sum of the ring network with the constraint conditions of the ring network, if the constraint conditions are satisfied, then no optimization is required; if the constraint conditions are not satisfied, then Trigger the processing of the adjustment calculation unit;

The adjustment amount calculation distribution unit includes: a first calculation subunit, which is used to calculate the adjusted reachable value of each optical multiplexing section according to the gain attenuation sum, constraint conditions and adjustment amount of each optical multiplexing section; the second calculation subunit, It is used to add the attainable value adjusted by each optical multiplexing section, and compare it with the constraint condition of the total gain attenuation sum of the ring network to determine the final value adjusted by each optical multiplexing section, so that the total gain attenuation sum of the ring network meets the constraint condition; The subunit is used to calculate the adjustment amount from the adjusted final value of each optical multiplexing section and distribute it to the corresponding OA and/or VOA of the downstream node.

Further, the above system can also have the following features: the control module also includes an adjustment sorting unit, which is used to prioritize the attenuation of the total gain of the ring network and tend to meet the constraint conditions or keep satisfying the constraint conditions in the first round of delivery. If there is still an adjustment amount that has not been issued, it will continue to be issued in the second round according to the priority principle; and the adjustment amount issued to a certain OA or VOA in each round does not exceed one unit step, and is issued at a time If it is not finished, it will be issued in multiple rounds; as described.

Further, the above-mentioned system can also have the following characteristics: the first calculation subunit of the adjustment amount calculation and allocation unit calculates the adjustment range of each optical multiplexing that does not meet the constraint conditions according to the adjustment range of the downstream node of the optical multiplexing section corresponding to OA and VOA. section gain attenuation and the achievable value that is closest to a set standard value, the standard value is selected from the range specified by the optical multiplex section gain attenuation and constraints, or the standard value is obtained from the upstream or The deviation value between the reachable value assigned by the downstream node and the constraint condition;

The second calculation subunit of the adjustment amount calculation distribution unit is to obtain the final value of the gain attenuation and adjustment of each optical multiplexing section in the following manner: first obtain the attainable value of the gain attenuation sum of each optical multiplexing section that needs to be adjusted and the value that does not need to be adjusted The detection value of each optical multiplexing section gain attenuation sum is added, compared with the constraint condition of the total gain attenuation sum of the ring network, if the condition is satisfied, then the final value of the corresponding optical multiplexing section gain attenuation and adjustment is based on the attainable value, If the conditions are not met, fine-tune the attainable value or detection value of the gain attenuation sum of each optical multiplexing section of the ring network, so that the total gain attenuation sum of the ring network meets the constraint conditions, and use the fine-tuned value as the gain attenuation of each optical multiplexing section and adjusted final value.

Furthermore, the above system may also have the following features: the control device is connected to each network element through a network management system or a signaling system.

As can be seen from the above, the present invention optimizes and controls the optical power of the optical multiplexing section of the ring network when the optical fiber line conditions change due to aging or temperature and the line loss changes according to the optical power of the optical multiplexing section of the OADM ring network. The loop gain and loss are within an appropriate range. Due to the constraints of excessive loss and self-excitation of the ring network, it not only effectively avoids the deterioration of the OSNR and power of the ring network caused by the increase in line loss, but also effectively avoids The loss reduction causes the ring network to be self-excited. Furthermore, when the adjustment amount is issued, technical measures such as adjustment amount subdivision and adjustment sequence optimization can be adopted to ensure that the equipment is gradually and smoothly optimized, and the effect of effectively ensuring the error-free operation of the equipment is achieved.

Description of drawings

Figure 1 is a schematic diagram of an OADM ring network;

Fig. 2 is a schematic diagram of an OADM ring network realizing multiplex section power optimization according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of an overall flow of a method for optimizing the power of multiplexing sections of a ring network according to an embodiment of the present invention;

Fig. 4 is a schematic diagram of optimizing the gain attenuation and method flow of each optical multiplexing section of the ring network;

Fig. 5 is a schematic flow chart of the method for optimizing the adjustment sequence;

Fig. 6 is a schematic diagram of a four-node OADM ring network for realizing multiplex section power optimization.

Detailed ways

Below in conjunction with accompanying drawing, the embodiment of technical scheme is described in further detail:

Fig. 1 is a schematic diagram of an OADM ring network, each network element includes a wavelength converter (OUT), an optical add/drop multiplexer (OADM) and an optical amplifier (OA). In Figure 1, when the loop gain is greater than the loss at the wavelengths that are directly connected to each node, they will be self-excited in the ring network, which will degrade the transmission performance of the ring network. Formation methods of the through wavelengths at each node include: protection wavelengths, idle wavelengths, or inconsistencies between the bandwidth of the OADM device and the center wavelength, resulting in a part of wavelength leakage.

Fig. 2 is the schematic diagram of the OADM ring network realizing the present embodiment OADM ring network multiplexing section power optimization method, each network element is composed of a wavelength converter (OUT), an optical add/drop multiplexer (OADM), an optical amplifier (OA), It consists of a variable optical attenuator (VOA) and a control device. In the following, the corresponding OA of the upstream node of the optical multiplexing section refers to the OA connected to the optical multiplexing section in the upstream node, and the OA corresponding to the downstream node of the optical multiplexing section refers to the OA connected to the optical multiplexing section through a VOA in the downstream node OA.

The control device is connected with each network element through a network management system or a signaling system, and is used to realize the power optimization of the multiplexing section of the OADM ring network. The device further includes a monitoring module, a control module and an execution module. in:

The monitoring module is connected to the OA in each network element, can be connected through a network management system or a signaling system, and is used to monitor the input and output power of each OA, and output to the control module;

The control module is used for monitoring the input and output power of each OA, calculating the gain attenuation sum of each optical multiplexing section and the total gain attenuation sum of the ring network, and judging whether it is within the range specified by the respective ring network constraints , if not satisfied, according to the difference between the gain attenuation sum of each optical multiplexing section and the total gain attenuation sum of the ring network and the constraint conditions, and the adjustment range of OA and VOA corresponding to the downstream nodes of each optical multiplexing section, determine the OA and VOA to be adjusted and their adjustments amount; further includes:

The gain attenuation and calculation unit includes: a first calculation subunit, which is used to calculate the difference between the output optical power of the upstream node corresponding to the OA and the input optical power of the OA corresponding to the downstream node for each optical multiplexing section, to obtain the cross-section loss, and then The gain of the upstream and downstream nodes corresponding to the OA is to obtain the gain and attenuation sum of the optical multiplexing section; the second calculation subunit is used to add the obtained gain and attenuation sum of each optical multiplexing section in the ring network to obtain the sum of the optical multiplexing section total gain reduction and .

Adjust the judgment unit, for comparing the gain attenuation sum of each optical multiplexing section of the ring network and the total gain attenuation sum of the ring network with the constraint conditions of the ring network, if the constraint conditions are met (see below), then optimization is not required; Constraint conditions trigger the processing of the adjustment calculation unit;

The adjustment amount calculation and allocation unit includes: a first calculation subunit, which is used to calculate the adjustment value of each optical multiplexing section according to the gain attenuation sum of each optical multiplexing section, the corresponding constraint conditions, the adjustment amount, and the deviation value assigned by other optical multiplexing sections. reachable value. Specifically, in this embodiment, according to the adjustment ranges of the downstream nodes of the optical multiplexing section corresponding to OA and VOA, the gain attenuation of each optical multiplexing section that does not meet the constraint conditions and the achievable value that is closest to a set standard value are calculated. , the standard value is selected from the range specified by the gain attenuation of the optical multiplex section and the constraint conditions, or the standard value is the deviation value between the reachable value assigned by the upstream or downstream node and the constraint condition; the second calculation subunit , which is used to add the adjusted achievable values of each optical multiplexing section, and compare it with the constraint conditions of the entire ring network to determine the final adjusted value of each optical multiplexing section, so that the total gain of the ring network attenuates and meets the constraint conditions. Specifically, in this embodiment, the attainable value of the gain attenuation sum of each optical multiplexing section that needs to be adjusted and the detected value of the gain attenuation sum of each optical multiplexing section that does not need to be adjusted are added together, and the constraint condition of the total gain attenuation sum of the ring network Comparing, as satisfying condition, then with described reachable value corresponding optical multiplexing section gain attenuation and the final value of adjustment, as not satisfying condition, then to the reachable value or detection value of each optical multiplexing section gain attenuation sum of ring network Fine-tuning, so that the total gain of the ring network is attenuated and meets the constraint conditions, and the fine-tuned value is used as the final value of the gain attenuation and adjustment of each optical multiplexing section; and the allocation subunit is used to calculate the final value of each optical multiplexing section adjustment Adjust the amount and distribute it to the corresponding OA and/or VOA of the downstream node.

Adjust the sorting unit, which is used to issue and execute in unit step and scheduled order, so that the ring network can be gradually and smoothly optimized; in the first round of priority delivery, the total gain of the ring network tends to attenuate and tend to meet the constraint conditions or maintain For the adjustment amount that meets the constraint conditions, if there is still an adjustment amount that has not been issued, it will continue to be issued in the second round according to the principle of priority. Moreover, the amount of adjustment issued to a certain OA or VOA in each round does not exceed one unit step, and if it cannot be issued at one time, it will be issued in multiple rounds.

The execution module is connected to the OA and VOA in each network element, and is used to perform dynamic adjustments successively according to a certain step size according to the OA and VOA to be adjusted, the adjustment value and the adjustment sequence determined by the control module, so that the total gain of the ring network Attenuation and satisfying the constraints, and on this premise, try to make the gain of each optical multiplexing section attenuate and satisfy the constraints.

As shown in Fig. 3, it is the overall flow diagram of the OADM ring network multiplexing section power optimization method described in the present invention, comprises the following steps:

Step 1, monitor the state of the ring network, calculate the gain attenuation sum of each optical multiplexing section and the total gain attenuation sum of the entire ring network;

The so-called ring network state is represented by the gain attenuation sum of each optical multiplexing section and the total gain attenuation of the entire ring network. For an optical multiplexing section, the output optical power of the node corresponding to the OA on it is subtracted from the input optical power of the downstream node corresponding to the OA, and the gain of the downstream node corresponding to the OA is added to obtain the gain attenuation of the optical multiplexing section and, and then add the gain attenuation sum of each optical multiplexing section to obtain the total gain attenuation sum of the entire ring network. In other implementation manners, the output optical power of a downstream node corresponding to an OA of an optical multiplexing section may also be directly subtracted from the output optical power of an upstream node corresponding to an OA to obtain the sum of gain and attenuation of the optical multiplexing section.

Step 2, judging whether the state of the ring network satisfies the constraint conditions of the ring network, if so, continue to monitor the state of the ring network in step 1; if not, proceed to step 3;

The ring network constraints include the requirements for the gain attenuation and _Mi (i=1, 2, ..., N) of each optical multiplexing section: C1≤M _i ≤0, which is used to ensure that the gain and attenuation of the ring network match , the OSNR and power of the ring network are not degraded; and the requirements for the total gain attenuation and M of the ring network: C2≤M<0, which are used to ensure that the gain of the ring network is less than the loss and avoid self-excitation. Wherein, C1 and C2 are preset constants less than 0, and values can be determined according to factors such as the ring network structure. The requirements for the overall gain reduction and M of the ring network take precedence. The constraint conditions are not limited to the above regulations, and sometimes the sum of the gain and attenuation of the optical multiplexing section may also be allowed to be greater than 0.

Step 3, ring network configuration optimization: According to the difference between the ring network state and constraint conditions and the adjustment range of the downstream nodes of the optical multiplex section corresponding to OA and VOA, determine the OA and VOA to be adjusted and their adjustments, and optimize the ring network optical multiplex section Gain attenuation and to meet the ring network constraints;

Step 4, ring network configuration reset: The OA and VOA to be adjusted and their adjustments are issued and executed in an appropriate step size and order, so that the ring network can be gradually and smoothly optimized.

As shown in Figure 4, the process of optimizing the gain attenuation sum of the optical multiplexing section of the ring network in step 3 further includes the following steps:

Step 40, first, start with a certain network element, start processing from the first optical multiplexing section (OMA section), judge its gain attenuation and whether it satisfies the constraint conditions in turn, and find the first one that does not meet the constraint conditions Optical multiplexing section, go to the next step;

Step 41, according to the adjustment range of the downstream node of the current optical multiplexing section corresponding to OA and VOA, the intermediate value of the constraint condition is the standard value, and the gain attenuation of the optical multiplexing section and the achievable value closest to the standard value that can be achieved are calculated ;

In this embodiment, the middle value of the constraint condition is used as a standard value, in order to have more room for adjustment in the subsequent fine-tuning. However, for a specific environment, the present invention can also select other values within the range specified by the constraints based on experience as standard values for calculation.

Step 42, judging whether the gain attenuation of the optical multiplexing section and the attainable value of _Mi meet the constraint condition: C1≤M _i≤0 , if satisfied, do not assign offset values to other optical multiplexing sections, and perform step 46, if not satisfied, To assign offset values to other optical multiplexing sections, go to step 43;

Step 43, judging whether the gain attenuation of the optical multiplexing section and the reachable value of _Mi are greater than zero, if so, perform step 44, otherwise, then go to step 45;

Step 44, if the upstream optical multiplexing section has not been processed, the difference between the value closest to _Mi in the range specified by the constraints minus the reachable value of the current optical multiplexing section _{Mi is} used as the deviation value, and assigned to the upstream optical multiplexing section, Execute step 46;

Step 45, if the downstream optical multiplexing section has not been processed, the difference between the value closest to _Mi in the constraint condition specified range minus the reachable value of the current optical multiplexing section _{Mi is} used as the deviation value, and allocated to the downstream optical multiplexing section;

For example, assuming that the gain attenuation sum of an optical multiplexing section before adjustment is 1, the constraint condition of the optical multiplexing section is -1≤M _i ≤0, the midpoint is -0.5, and the adjustment range corresponding to the VOA of the downstream node is 2, then the optical multiplexing section The achievable value of the gain reduction sum of the segment is -0.5. If the gain attenuation sum of the optical multiplexing section is 2 before adjustment, and other conditions remain unchanged, the attainable value of the gain attenuation sum of the optical multiplexing section is 0; if the gain attenuation sum of the optical multiplexing section is 2.5 before adjustment, other If the conditions remain unchanged, the attainable value of the gain-attenuation sum of the optical multiplex section is 0.5, and a deviation value of -0.5 needs to be assigned to the unprocessed upstream optical multiplex section. If the upstream multiplex section has been processed, it will be processed again during fine-tuning.

Step 46, judge whether each optical multiplexing section of the ring network has been processed, if yes, execute step 49, otherwise, the next optical multiplexing section is the current multiplexing section, and execute step 47;

Step 47, first judge whether the current optical multiplexing section is allocated with a deviation value, if there is, then use the sum of the offset adjustment values allocated by other optical multiplexing sections as a standard value to calculate the gain attenuation sum of the optical multiplexing section that is closest to the value that can be achieved The attainable value of standard value (step 47a), returns to step 42, if not allocated with deviation value, executes step 48;

Step 48, judging whether the gain attenuation sum of the optical multiplexing section satisfies the constraint condition, if so, no adjustment is required, and step 46 is performed, otherwise, return to step 41;

Step 49, adding the attainable value of the gain attenuation sum of each optical multiplexing section to be adjusted and the detected value of the gain attenuation sum of each optical multiplexing section that does not need to be adjusted, and judging whether the obtained total gain attenuation sum of the ring network has satisfied the constraint condition C2 ≤M<0, if yes, use these reachable values as the final value of gain attenuation and adjustment of the corresponding optical multiplexing section, and perform step 51, otherwise, perform step 50;

Step 50, fine-tune the attainable value and detection value of the gain attenuation sum of each optical multiplexing section of the ring network, so that the total gain attenuation sum of the ring network satisfies the constraint condition C2≤M<0, and use the fine-tuned value as each optical multiplexing section the final value of the gain reduction and adjustment;

When fine-tuning, first adjust the gain attenuation sum of those optical multiplexing sections whose reachable values or detection values are within the constraint condition C1≤Mi≤0 and have room for adjustment to the direction that satisfies the overall gain attenuation and constraint conditions of the ring network. For example, the constraint conditions for the gain attenuation sum of the optical multiplexing section and the total gain attenuation sum are both -1<M<0, and the total gain attenuation sum of the ring network calculated before fine-tuning is +0.5, then when fine-tuning, each optical multiplexing section The attainable value or detection value of the gain attenuation sum is adjusted within the range specified by the constraint conditions, here it is adjusted to -1, such as adjusting the gain attenuation sum of the two optical multiplexing sections from -0.5 to -0.75, so as to meet the requirements of the ring network Under the premise of the total gain attenuation and constraint conditions, the gain attenuation sum of each optical multiplexing section also satisfies its own constraint conditions. If the condition of the total gain attenuation sum cannot be satisfied, the gain attenuation sum of the optical multiplexing section can be adjusted beyond the constraints, or the components OA and VOA can be replaced.

Step 51, distribute the difference between the current value and the final value of the gain attenuation sum of each optical multiplexing section, that is, the adjustment amount, to the corresponding OA and/or VOA of the downstream node, and end.

The priority allocation principle is: when the gain attenuation sum is to be increased, the VOA attenuation is firstly reduced, and then the OA gain is increased; when the gain attenuation sum is to be decreased, the OA gain is firstly decreased, and then the VOA is increased attenuation. This is more conducive to the performance of the system.

In particular, it should be noted that the above process of determining the final value of the gain attenuation and optimal adjustment of each optical multiplexing section of the ring network is just an example. In fact, it is not necessary to follow a fixed process for derivation. It is also possible to derive by value try method. Or at the beginning, only calculate the reachable value of each optical multiplex section that does not meet the constraint conditions, without assigning the deviation value; Add the detection value of the segment gain attenuation and compare it with the constraint condition C2≤M<0. If the condition is satisfied, no adjustment is required. If the condition is not satisfied, fine-tuning is also possible. In short, as long as the total gain of the final ring network can be attenuated and meet the constraint conditions, under this premise, the gain attenuation of each optical multiplexing section can meet the constraint conditions as much as possible, and the adjusted final value is not unique.

In order to prevent the performance of the ring network from being degraded due to improper order or too fast delivery of the adjustments of the execution modules, when resetting the ring network configuration in the above step 4, the adjustments of the OA and VOA to be adjusted should be adjusted at an appropriate step size. and sequential delivery execution, as shown in Figure 5, can be completed through the following steps:

Step 61, selecting a node of the ring network as the starting node;

Step 62, finding the first optical multiplexing section to be adjusted;

Step 63, judging whether the adjustment amount of the current optical multiplexing section makes the total gain of the ring network attenuate and approach the constraint condition or remain within the constraint condition, if so, then perform step 65; otherwise perform step 64;

For example, the value of the total gain attenuation sum of the current ring network is 1, and the current adjustment amount of the optical multiplexing section is -0.5, then the adjustment amount makes the total gain attenuation sum of the ring network approach the constraint condition. This is to avoid self-excitation or performance deterioration of the ring network due to unsatisfied constraints during the adjustment process.

Step 64, find the next optical multiplexing section to be adjusted, and return to step 63;

Step 65: Arrange the downstream node of the optical multiplexing section in order to be adjusted in this round corresponding to OA or VOA and its adjustment amount. The distribution method of the adjustment amount on the OA or VOA has been explained above. Each round can transfer an optical multiplexing section The adjustment amount is limited to a value, which can be called the unit step size, so as to avoid the impact on the work of the ring network caused by too fast adjustment;

Step 66, judge whether the optical multiplexing section is the last optical multiplexing section to be adjusted, if so, execute step 67; otherwise return to step 64;

Step 67, judging whether the adjustment amount of each optical multiplexing section has been arranged (including the unarranged or only part of the adjustment amount in this round), if so, execute step 69; if not, execute step 68;

Step 68, enter the next round of adjustment amount arrangement, and return to step 62;

In step 69, the adjustment order of all optical multiplex section adjustments is obtained, and the order is delivered and executed.

In another implementation manner, it is also possible to issue sequentially at the same time during calculation.

The present invention is further described with an example below:

Figure 6 is a ring network with four OADM network elements 1, 2, 3, and 4. The ring network has 4 optical multiplexing sections. Between network element 1 and network element 2 is an optical multiplexing section, denoted as OMS#1. Between network element 2 and network element 3 is an optical multiplexing section, denoted as OMS#2. Between network element 3 and network element 4 is an optical multiplexing section, denoted as OMS#3. Between network element 4 and network element 1 is an optical multiplexing section, which is denoted as OMS#4. The detected ring status is shown in the table below.

Assume that the constraint conditions of the ring network are: -1≤M _i ≤0 and -1≤M≤0. OMS#2 does not meet the constraint conditions of the optical multiplexing section, and the total gain attenuation sum of the ring network is greater than the loss, and there is a possibility of self-excitation.

Assuming that the adjustment range of each VOA is 3, according to the method shown in the present invention, the attainable value and the final value of the calculated OMS#2 gain attenuation sum are both -0.5, and the gain attenuation and final values of other OMSs are still 0, so there is no need to adjust , the total gain attenuation sum of the ring network is -0.5. When issuing, because the gain attenuation sum needs to be reduced, the VOA2 corresponding to the downstream node of OMS#2 is adjusted. Assuming that the VOA adjustment step size is 0.5, the VOA2 adjustment amount of 2.5 needs to be issued in 5 rounds. Of course, it is also possible to set the final value of the gain attenuation sum of OMS#2 to 0, and issue the adjustment value 2 of VOA2 in four rounds.

Under another condition, if the adjustment amount of VOA is 1.5, the calculated reachable value of OMS#2 is 0.5, and a deviation value of -0.5 needs to be assigned to OMS#1, then the final value of the gain attenuation sum of each segment Among them, OMS#1 is -0.5, the adjustment amount is -0.5; OMS#2 is 0.5, the adjustment amount is -1.5; others are zero. According to the distribution method of the adjustment amount in the invention, it can be determined that the adjustment amount of VOA1 is 0.5, and the adjustment amount of VOA2 is 1.5. When issuing, the adjustment amount of VOA1 and VOA2 is issued in the first round. Then issue the VOA2 adjustment amount of 0.5.

In summary, the present invention optimizes the optical power of the optical multiplexing section of the entire ring network according to the optical power of the optical multiplexing layer of the OMS in the entire OADM ring network, and adopts constraints that consider excessive loss and self-excitation to achieve This not only effectively avoids the deterioration of the OSNR and power of the ring network caused by the increase of line loss, but also effectively avoids the self-excitation of the ring network caused by the reduction of loss. At the same time, in the process of issuing the adjustment amount of the execution module, the adjustment amount is gradually issued with a small adjustment step, and the ring network tends to the constraint condition during the issuance process, so that the optical power of the ring network is gradually optimized smoothly. Due to the adoption of technical measures such as considering the constraints of excessive loss and self-excitation, subdividing the adjustment amount, and judging the order of issuing the adjustment amount according to whether the adjustment tends to the constraint condition, it can effectively ensure that the system runs without errors during the optimization process of the OADM ring network.

Claims (13)

1, a kind of optical add-drop multiplexer ring network multiplexing section power optimization method, be applied to each optical multiplexing section upstream node has corresponding optical amplifier OA, downstream node has the system of corresponding OA and optical attenuator VOA, the method comprises the following step: (a) monitor the input and output power of the amplifier in each network element of the ring network, calculate the gain attenuation sum of each optical multiplexing section and the total gain attenuation sum of the ring network; When calculating the gain attenuation sum of an optical multiplexing section, the monitored output optical power of the upstream node of the optical multiplexing section corresponding to the OA is subtracted from the input optical power of the downstream node corresponding to the OA, plus the output optical power of the downstream node corresponding to the OA. Gain is obtained, or it is obtained by subtracting the output optical power of its upstream node corresponding to OA from the output optical power of its downstream node corresponding to OA; of; (b) Judging whether the calculated gain attenuation sum of each optical multiplexing section and the total gain attenuation sum of the ring network are within the range specified by the ring network constraint conditions, if satisfied, perform step (a), otherwise, perform step (c) ; In the ring network constraints, the requirements for the gain attenuation and Mi of each optical multiplexing section are: C1≤Mi≤0; the requirements for the total gain attenuation and M of the ring network are: C2≤M<0; among them, C1 and C2 are The preset constant less than 0 gives priority to the overall gain attenuation and M requirements of the ring network; (c) Determine the OA and VOA to be adjusted and their adjustments according to the gain attenuation sum of each optical multiplexing section and the difference between the total gain attenuation sum of the ring network and their respective constraints, as well as the adjustment range of the downstream nodes of the optical multiplexing section corresponding to OA and VOA , so that the total gain of the ring network is attenuated and the constraints are met; (d) Issue and execute the OA and VOA to be adjusted and their adjustments, so that the ring network can be optimized. 2. The method according to claim 1, wherein said step (c) further comprises the following steps: (c1) According to the adjustment range corresponding to OA and VOA of the downstream nodes of the optical multiplexing section, calculate the gain attenuation of each optical multiplexing section that does not satisfy the constraints and the attainable value that is closest to a set standard value; (c2) Add the attainable value of the gain attenuation sum of each optical multiplexing section that needs to be adjusted and the detected value of the gain attenuation sum of each optical multiplexing section that does not need to be adjusted, and compare it with the constraint condition of the total gain attenuation sum of the ring network, such as satisfying the condition , then the final value of the corresponding optical multiplexing section gain attenuation and adjustment is used as the attainable value, and step (c4) is executed, and if the condition is not satisfied, step (c3) is executed; (c3) fine-tune the attainable value or detection value of the gain attenuation sum of each optical multiplexing section of the ring network, so that the total gain attenuation of the ring network meets the constraint conditions, and use the fine-tuned value as the gain attenuation and adjustment of each optical multiplexing section final value; (c4) Distribute the difference between the current value and the final value of the gain attenuation sum of each optical multiplexing section, that is, the adjustment amount, to the corresponding OA and/or VOA of the downstream node, and end. 3. The method according to claim 2, characterized in that the standard value in the step (c1) is selected from the range specified by the optical multiplex section gain attenuation and constraints. 4. The method according to claim 2, characterized in that said step (c1) is further divided into the following steps: (c11) Start with a certain network element, start processing from the first optical multiplexing section, judge its gain attenuation and whether it meets the constraint conditions in turn, and when the first optical multiplexing section that does not meet the constraint conditions is found, execute Next step; (c12) According to the adjustment range of OA and VOA corresponding to the downstream node of the current optical multiplexing section, select a standard value from the range specified by the constraint conditions, and calculate the gain attenuation of the optical multiplexing section and the reachability closest to the standard value that can be achieved value; (c13) Judging whether the gain attenuation of the optical multiplexing section and the reachable value of Mi satisfy the constraint condition: C1≤Mi≤0, if satisfied, perform step (c17), otherwise perform step (c14); (c14) judge whether the gain attenuation of this optical multiplexing section and the reachable value of Mi are greater than zero, if so, perform step (c15), otherwise, perform step (c16); (c15) If the upstream optical multiplexing section has not been processed, the difference between the value closest to Mi minus the current optical multiplexing section Mi's reachable value in the range specified by the constraint conditions is used as the deviation value, and is assigned to the upstream optical multiplexing section, and the steps are performed (c17); (c16) If the downstream optical multiplexing section has not been processed, the difference between the value closest to Mi minus the current optical multiplexing section Mi's reachable value in the range specified by the constraints is used as the deviation value, and is assigned to the downstream optical multiplexing section; (c17) judge whether each optical multiplexing section of the ring network has been processed, if so, perform step (c2), otherwise, the next optical multiplexing section is the current multiplexing section, and perform step (c18); (c18) Judging whether the current optical multiplexing section is allocated with a deviation value, if so, the sum of the offset adjustment values allocated by other optical multiplexing sections is used as the standard value, and the gain attenuation sum of the optical multiplexing section is calculated to be the closest to the standard The reachable value of the value, return to step (c13), if no deviation value is assigned, execute (c19); (c19) Judging whether the gain attenuation sum of the optical multiplexing section satisfies the constraint condition, if so, no adjustment is required, and step (c17) is executed; otherwise, return to step (c12). 5. The method according to claim 2, characterized in that, when fine-tuning the attainable values or detected values of the gain attenuation sum of each optical multiplexing section in the step (c3), those attainable values or detected values are preferentially adjusted The gain attenuation of the optical multiplexing section whose value satisfies the constraint condition C1≤Mi≤0 and has room for adjustment is adjusted to the direction that satisfies the total gain attenuation and constraint conditions of the ring network; if the total gain attenuation and constraint conditions of the ring network cannot be satisfied, then the The gain of the optical multiplexing section is attenuated and adjusted beyond the constraints, or the OA and/or VOA are replaced. 6. The method according to claim 2, characterized in that, in the step (c4), when the adjustment amount of the gain attenuation sum of the optical multiplexing section is allocated, when the gain attenuation sum is to be increased, the VOA is preferentially reduced Attenuation, then increase the gain of OA; when you want to reduce the gain attenuation sum, first reduce the gain of OA, and then increase the attenuation of VOA. 7. The method according to claim 1, characterized in that, in the step (d), when ordering the delivery of the adjustment amounts of the OA and VOA to be adjusted, priority is given to the first round of delivery The total gain of the ring network is attenuated and tends to meet the constraint conditions or can maintain the adjustment quantity that meets the constraint conditions. If there is still an adjustment quantity that has not been issued, it will continue to be issued in the second round according to the priority principle. 8. The method according to claim 1 or 7, characterized in that, in the step (d), the adjustment amount issued to a certain OA or VOA does not exceed a set unit step, and cannot be issued at one time Yes, distributed in multiple rounds. 9. An optical add-drop multiplexer ring network multiplexing section power optimization system, including each network element connected through the optical multiplexing section, characterized in that each network element includes a dimmable light connected to the upstream optical multiplexing section The attenuator VOA, the optical amplifier OA connected to the VOA, and the OA connected to the downstream optical multiplexing section, and each network element is connected to a control device, and the control device further includes a monitoring module, a control module and an execution module, wherein : The monitoring module is connected to the OA in each network element, used to monitor the input and output power of each OA, and output to the control module; The control module is used for monitoring the input and output power of each OA, calculating the gain attenuation sum of each optical multiplexing section and the total gain attenuation sum of the ring network, and judging whether it is within the range specified by the respective ring network constraints , if not satisfied, according to the difference between the gain attenuation sum of each optical multiplexing section and the total gain attenuation sum of the ring network and the constraint conditions, and the adjustment range of the downstream nodes of each optical multiplexing section corresponding to OA and VOA, determine the OA and VOA to be adjusted and their adjustment amount; When calculating the gain attenuation sum of an optical multiplexing section, the monitored output optical power of the upstream node of the optical multiplexing section corresponding to the OA is subtracted from the input optical power of the downstream node corresponding to the OA, plus the output optical power of the downstream node corresponding to the OA. gain; the total gain attenuation sum of the ring network is obtained by adding the gain attenuation sum of each optical multiplexing section of the ring network; the requirements for the gain attenuation sum Mi of each optical multiplexing section in the ring network constraints are: C1≤Mi≤0 ,; The requirements for the total gain attenuation and M of the ring network are: C2≤M<0; where, C1 and C2 are preset constants less than 0, and the requirements for the total gain attenuation and M of the ring network are more preferred; The execution module is connected with the OA and VOA in each network element, and is used for issuing and executing the OA and VOA to be adjusted and the adjustment value determined by the control module. 10. The system according to claim 9, wherein the control module further comprises a gain attenuation and calculation unit, an adjustment judgment unit and an adjustment calculation unit: The gain attenuation and calculation unit includes: a first calculation subunit, used to calculate the gain attenuation sum of each optical multiplexing section; a second calculation subunit, used to calculate the total gain attenuation sum of the ring network; Adjusting the judgment unit, used to compare the gain attenuation sum of each optical multiplexing section of the ring network and the total gain attenuation sum of the ring network with the constraint conditions of the ring network, if the constraint conditions are satisfied, then no optimization is required; if the constraint conditions are not satisfied, then Trigger the processing of the adjustment calculation unit; The adjustment amount calculation and allocation unit includes: a first calculation subunit, which is used to calculate the adjustable value of each optical multiplexing section according to the gain attenuation sum, constraint conditions, adjustment amount and other optical multiplexing section distribution deviation values of each optical multiplexing section. reach value; the second calculation subunit is used to add the adjusted reachable value of each optical multiplexing section, and compare with the constraint condition of the total gain attenuation sum of the ring network to fine-tune the adjusted reachable value of each optical multiplexing section, Attenuate the total gain of the ring network and meet the constraint conditions, and use the fine-tuned value as the final value of each optical multiplexing section adjustment; the allocation subunit is used to calculate the adjustment amount from the final adjusted value of each optical multiplexing section and distribute it to the downstream The OA and/or VOA corresponding to the node. 11. The system according to claim 10, characterized in that, the control module further includes an adjustment sorting unit, which is used to prioritize the attenuation of the total gain of the ring network and tend to meet the constraint conditions or energy Keep the adjustment amount that meets the constraint conditions. If there is still an adjustment amount that has not been issued, it will continue to be issued in the second round according to the priority principle; and the adjustment amount issued to a certain OA or VOA in each round does not exceed one unit step , which cannot be finished at one time, will be distributed in multiple rounds. 12. The system according to claim 10, characterized in that, the first calculation subunit of the adjustment amount calculation and allocation unit calculates the adjustment range of each unsatisfied constraint according to the adjustment range of the downstream node of the optical multiplexing section corresponding to OA and VOA Conditional optical multiplexing section gain attenuation and the achievable value that is closest to a set standard value, the standard value is selected from the range specified by the optical multiplexing section gain attenuation and constraints, or, the standard value is the deviation value between the reachable value assigned from the upstream or downstream node and the constraint condition; The second calculation subunit of the adjustment amount calculation distribution unit is to obtain the final value of the gain attenuation and adjustment of each optical multiplexing section in the following manner: first obtain the attainable value of the gain attenuation sum of each optical multiplexing section that needs to be adjusted and the value that does not need to be adjusted The detection values of each optical multiplexing section gain attenuation sum are added, compared with the constraint conditions of the total gain attenuation sum of the ring network, if the condition is satisfied, then the final value of the corresponding optical multiplexing section gain attenuation and adjustment is based on the attainable value, If the conditions are not met, fine-tune the attainable value or detection value of the gain attenuation sum of each optical multiplexing section of the ring network, so that the total gain attenuation sum of the ring network meets the constraint conditions, and use the fine-tuned value as the gain attenuation of each optical multiplexing section and adjusted final value. 13. The system according to claim 11, wherein the control device is connected to each network element through a network management system or a signaling system.

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