CN113114351B - A method and device for determining the performance of an optical transmission system - Google Patents

Abstract

The present application provides a method and device for determining the performance of an optical transmission system, which relate to the technical field of communications, so as to at least solve the problem of inaccurate performance of the optical transmission system determined in the prior art. The method for determining the performance of the optical transmission system includes: acquiring performance parameters of at least one optical amplification section; the performance parameters include the output power of the optical amplification section, the gain of the optical amplifier in the optical amplification section, and the noise index of the optical amplifier in the optical amplification section; an optical amplification section It includes a section of optical fiber and an optical amplifier; the gain of the optical amplifier in an optical amplifier section is the sum of the fiber attenuation of a section of optical fiber and the attenuation margin reserved in an optical amplifier; at least one is determined according to the performance parameters of the optical amplifier section and the preset formula. Optical signal-to-noise ratio of the optical amplification section.

Description

A method and device for determining the performance of an optical transmission system

technical field

The present application relates to the field of communication technologies, and in particular, to a method and device for determining the performance of an optical transmission system.

Background technique

Optical transmission is a technology that transmits in the form of optical signals between the sender and the receiver. The optical transmission system has the advantages of strong anti-interference ability, fast transmission speed, and long transmission distance. At present, the performance of an optical transmission system is usually measured by an optical signal-to-noise ratio (optical signal noise ratio, OSNR). In the International Telecommunication Union (International Telecommunication Union, ITU) protocol ITU-TRec G.692, an algorithm for OSNR under the condition of uniform attenuation of each optical amplification section in an optical transmission system is provided. However, in practical applications, the attenuation of each optical amplification section of the optical transmission system is not uniform, so the determined result is not accurate.

SUMMARY OF THE INVENTION

The present application provides a method and device for determining the performance of an optical transmission system, so as to at least solve the problem of inaccurate performance of the optical transmission system determined in the prior art. The technical solution of this application is as follows:

According to a first aspect of the present application, there is provided a method for determining the performance of an optical transmission system, which is applied to a performance determining device of an optical transmission system, the performance determining method comprising: the performance determining device of the transmission system obtains a performance parameter of at least one optical amplification section , and the optical signal-to-noise ratio of at least one optical amplifying section is determined according to the performance parameters of the optical amplifying section and a preset formula. The performance parameters include the output power of the optical amplifier section, the gain of the optical amplifier in the optical amplifier section, and the noise index of the optical amplifier in the optical amplifier section. An optical amplifier section includes a section of optical fiber and an optical amplifier. The gain of the optical amplifier in the optical amplifier section is a section of optical fiber. The sum of the fiber attenuation and the attenuation margin reserved in an optical amplifier.

It can be seen that, in the method for determining the performance of the transmission system provided by the present application, the device for determining the performance of the transmission system determines the optical signal-to-noise ratio of at least one optical amplification section according to the performance parameters of the optical amplification section. The performance parameters of the optical amplification section in this application include the gain of the optical amplifier in the optical amplification section, and the gain of the optical amplifier in the optical amplification section is the sum of the fiber attenuation of the optical fiber in the optical amplification section and the attenuation margin reserved for the optical amplifier in the optical amplification section and. In this way, when determining the optical signal-to-noise ratio of at least one optical amplifier section, both the attenuation of the optical fiber in the optical amplifier section and the attenuation margin reserved in the optical amplifier are considered, avoiding the need to directly determine the optical fiber in the optical amplifier section. The optical fiber attenuation of the optical fiber, the determined performance result of the optical amplification section is the problem of the optical signal-to-noise ratio under the condition of uniform attenuation, which improves the accuracy of the performance determination result.

Optionally, the output power of the optical amplifier section is positive 1 dBm, or positive 4 dBm.

其中，j∈N，OSNR_总1表示至少一个光放大段的光信噪比，N表示光放大段的数量，P_j表示第j个光放大段的输出功率，L_j表示第j个光放大段中光放大器的增益，NF_j表示第j个光放大段中光放大器的噪声指数。Optionally, the optical signal-to-noise ratio of at least one optical amplification section satisfies the formula:

Among them, j∈N, OSNR _{always 1} represents the optical signal-to-noise ratio of at least one optical amplifier, N represents the number of optical amplifiers, _Pj represents the output power of the jth optical amplifier, and _Lj represents the jth optical amplifier is the gain of the optical amplifier in the segment, and NF _j represents the noise figure of the optical amplifier in the jth optical amplifier segment.

i∈N，N表示光放大段的数量，OSNR_i表示第i个光放大段的光信噪比，第i个光放大段为主用光放大段，或者备用光放大段，P_i表示第i个光放大段的输出功率，L_i表示第i个光放大段中光放大器的增益，NF_i表示第i个光放大段中光放大器的噪声指数。Optionally, when the optical transmission system is configured with optical multiplexing section protection, the optical signal-to-noise ratio of at least one optical amplification section satisfies the formula: OSNR _{total 2} =-10lg10 ^-0.1×OSNRΔ , where OSNR _{total 2} represents at least one Optical signal-to-noise ratio of the optical amplification section, OSNRΔ=min{OSNRΔ1,...,OSNRΔi,...,OSNRΔN}, OSNRΔi=OSNR ₁ +...+OSNR _i +...+OSNRN,

i∈N, N represents the number of optical amplification sections, OSNR _i represents the optical signal-to-noise ratio of the ith optical amplification section, the ith optical amplification section is the main optical amplification section, or the backup optical amplification section, and Pi represents the _ith optical amplification section The output power of the i optical amplification section, _{Li represents the gain of the optical amplifier in the ith optical amplification section, and NF i represents} the noise figure of the optical amplifier in the ith optical amplification section.

According to a second aspect of the present application, there is provided an apparatus for determining performance of an optical transmission system, the apparatus for determining performance of an optical transmission system including an acquisition module and a determination module. The acquisition module is used to acquire the performance parameters of at least one optical amplification section; the performance parameters include the output power of the optical amplification section, the gain of the optical amplifier in the optical amplification section, and the noise index of the optical amplifier in the optical amplification section; an optical amplification section includes a section of optical fiber and a An optical amplifier; a determination module, configured to determine the optical signal-to-noise ratio of at least one optical amplification section according to the performance parameters of the optical amplification section acquired by the acquisition module and a preset formula.

Optionally, the output power of the optical amplifier section is positive 1 dBm, or positive 4 dBm.

其中，j∈N，OSNR_总1表示至少一个光放大段的光信噪比，N表示光放大段的数量，P_j表示第j个光放大段的输出功率，L_j表示第j个光放大段中光放大器的增益，NF_j表示第j个光放大段中光放大器的噪声指数。Optionally, the optical signal-to-noise ratio of at least one optical amplification section satisfies the formula:

Among them, j∈N, OSNR _{always 1} represents the optical signal-to-noise ratio of at least one optical amplifier, N represents the number of optical amplifiers, _Pj represents the output power of the jth optical amplifier, and _Lj represents the jth optical amplifier is the gain of the optical amplifier in the segment, and NF _j represents the noise figure of the optical amplifier in the jth optical amplifier segment.

i∈N，N表示光放大段的数量，OSNR_i表示第i个光放大段的光信噪比，第i个光放大段为主用光放大段，或者备用光放大段，P_i表示第i个光放大段的输出功率，L_i表示第i个光放大段中光放大器的增益，NF_i表示第i个光放大段中光放大器的噪声指数。Optionally, when the optical transmission system is configured with optical multiplexing section protection, the optical signal-to-noise ratio of at least one optical amplification section satisfies the formula: OSNR _{total 2} =-10lg10 ^-0.1×OSNRΔ , where OSNR _{total 2} represents at least one Optical signal-to-noise ratio of the optical amplification section, OSNRΔ=min{OSNRΔ1,...,OSNRΔi,...,OSNRΔN}, OSNRΔi=OSNR ₁ +...+OSNR _i +...+OSNR _N ,

i∈N, N represents the number of optical amplification sections, OSNR _i represents the optical signal-to-noise ratio of the ith optical amplification section, the ith optical amplification section is the main optical amplification section, or the backup optical amplification section, and Pi represents the _ith optical amplification section The output power of the i optical amplification section, _{Li represents the gain of the optical amplifier in the ith optical amplification section, and NF i represents} the noise figure of the optical amplifier in the ith optical amplification section.

According to a third aspect of the present application, there is provided an apparatus for determining performance of an optical transmission system, comprising: a processor and a memory for storing instructions executable by the processor; wherein the processor is configured to execute the instructions to implement the steps as described in the first A method of determining performance of an optical transmission system in one aspect.

According to a fourth aspect of the present application, a computer-readable storage medium is provided, and instructions are stored on the computer-readable storage medium, and when the instructions in the computer-readable storage medium are executed by the processor of the performance determination device of the optical transmission system, The performance determination apparatus of the optical transmission system is enabled to perform the performance determination method of the optical transmission system as in the above-mentioned first aspect.

According to a fifth aspect of the present application, there is provided a computer program product comprising computer instructions which, when executed by a processor of a performance determination device of an optical transmission system, cause the performance determination device of an optical transmission system to perform as in the first aspect A method for determining the performance of an optical transmission system.

It can be understood that any of the performance determination devices, computer-readable storage media or computer program products of the optical transmission system provided above are all used to execute the methods provided above. Therefore, the beneficial effects that can be achieved can be referred to above. The method in this paper and the beneficial effects of the corresponding solutions in the following specific implementation manner will not be repeated here.

Description of drawings

The accompanying drawings are incorporated into and constitute a part of the specification, illustrate embodiments consistent with the present application, and together with the description, serve to explain the principles of the present application, and do not constitute an improper limitation of the present application.

FIG. 1 is a schematic structural diagram of an optical transmission system according to an exemplary embodiment;

FIG. 2 is one of the schematic structural diagrams of an optical amplification section according to an exemplary embodiment;

3 is a schematic diagram of a hardware structure of a device for determining performance of an optical transmission system according to an exemplary embodiment;

FIG. 4 is a flowchart of a method for determining performance of an optical transmission system according to an exemplary embodiment;

FIG. 5 is a second schematic structural diagram of an optical amplification section according to an exemplary embodiment;

FIG. 6 is a schematic structural diagram of an apparatus for determining performance of an optical transmission system according to an exemplary embodiment.

Detailed ways

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

In the embodiments of the present application, in order to clearly describe the technical solutions of the embodiments of the present application, words such as "first" and "second" are used to distinguish the same or similar items with basically the same functions and functions. Those skilled in the art can understand that the words "first", "second" and the like do not limit the quantity and execution order, and the words "first", "second" and the like are not necessarily different. The technical features described in the "first" and second" have no sequence or order of magnitude.

In the embodiments of the present application, words such as "exemplary" or "for example" are used to represent examples, illustrations or illustrations. Any embodiments or designs described in the embodiments of the present application as "exemplary" or "such as" should not be construed as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "such as" is intended to present the related concepts in a specific manner to facilitate understanding.

In the description of this application, unless otherwise stated, "/" indicates that the object associated with it is an "or" relationship, for example, A/B can indicate A or B; "and/or" in this application is only It is an association relationship that describes an associated object, indicating that there can be three kinds of relationships, for example, A and/or B, which can be expressed as: A alone exists, A and B exist at the same time, and B exists alone, among which A, B Can be singular or plural. Also, in the description of the present application, unless stated otherwise, "plurality" means two or more than two. "At least one item(s) below" or similar expressions thereof refer to any combination of these items, including any combination of single item(s) or plural items(s). For example, at least one (a) of a, b, or c can represent: a, b, c, a-b, a-c, b-c, or a-b-c, where a, b, c may be single or multiple .

In the embodiments of the present application, at least one may also be described as one or more, and the multiple may be two, three, four or more, which is not limited in this application.

For ease of understanding, the technical terms involved in the embodiments of the present application are first described.

Optical link refers to the link that uses optical fiber communication technology to transmit sound signals, image signals and data signals. It is generally composed of optical transmitter (electrical signal/optical signal converter), optical fiber, optical receiver (optical signal/electrical signal converter) and other necessary optical devices (such as optical amplifier, optical connector, optical splitter and optical attenuation). device, etc.).

The optical amplification section is the basis for forming an optical link and is used to realize the amplification/reduction of the optical signal in the optical link. It is generally composed of an optical fiber section and an optical amplifier.

58 formula is the OSNR algorithm of the optical amplification section provided in ITU-T Rec G.692. Among them, OSNR=58+P-L-NF-10lgN, OSNR represents the OSNR of the optical link, P represents the output power of each channel in the optical link, L represents the fiber attenuation between the optical amplifiers, NF represents the noise figure of the optical amplifier, and N represents the The number of fiber segments in an optical link.

A reconfigurable optical add-drop multiplexer (ROADM) refers to a network element (or node or site) that can be configured remotely to realize the dynamic change of the wavelength of the add service and the wavelength of the drop service. control.

With the gradual maturity of optical fiber communication technology, optical transmission systems have been widely used. FIG. 1 is a schematic structural diagram of an optical transmission system, which is shown in a highly simplified form for ease of description rather than limitation. As shown in FIG. 1 , the optical transmission system includes an optical transmitter 11 , at least one optical amplifier section 12 , and an optical receiver 14 . The optical transmitter 11 and the optical receiver 14 transmit optical signals through at least one optical amplifier section 12 .

Exemplarily, FIG. 2 is a schematic structural diagram of the optical amplification section 12 , and the optical amplification section 12 includes an optical fiber section 121 and an optical amplifier 122 . The optical fiber segment 121 can span a relatively long geographic distance (eg, tens, hundreds or thousands of kilometers); the optical amplifier 122 is used to amplify the optical signal to compensate for the loss of the optical signal during propagation.

Specifically, the optical transmitter 11 is used to convert other signals into optical signals and send them to the optical amplification section 12; at least one optical amplification section 12 is used to transmit the optical signal sent by the optical transmitter 11; the optical receiver 14 is used to receive The optical signal transmitted by the optical amplifying section 12 is converted into other signals, thereby completing the transmission of the other signals.

Optionally, as shown in FIG. 1 , the optical transmission system may further include a branch unit 13 . For example, branch unit 13 may include a ROADM station, or other suitable optical filters/components (eg, may include circuitry for remote monitoring and control) for transmitting and receiving channels from branch paths (eg, branch path 131 ) wavelength.

The pros and cons of the current optical transmission system performance are usually measured by OSNR. In ITU-T Rec G.692, the algorithm of OSNR under the condition of uniform attenuation of each optical amplification section in the optical transmission system is provided. However, in practical applications, fiber aging and splice loss will affect signal transmission, so the attenuation of each optical amplification section of the optical transmission system is not uniform, so the determined results are not accurate.

In view of the above problems, the present application provides a method for determining the performance of an optical transmission system, which can consider both the attenuation of the optical fiber in the optical amplification section and the optical signal-to-noise ratio of at least one optical amplification section when determining the optical signal-to-noise ratio. The attenuation margin reserved in the amplifier avoids the problem of optical signal-to-noise ratio in the case of uniform attenuation based on the optical fiber attenuation of the optical fiber in the optical amplification section, and the performance result of the optical amplification section is determined, which improves the accuracy of the performance determination result. sex.

FIG. 3 is a schematic structural diagram of an apparatus for determining performance of an optical transmission system according to an exemplary embodiment. The apparatus for determining the performance of the optical transmission system may include a processor 302, and the processor 302 is configured to execute application code, thereby implementing the method for determining the performance of the optical transmission system in this application.

The processor 302 may be a central processing unit (CPU), a microprocessor, an application-specific integrated circuit (ASIC), or one or more integrated circuits for controlling the execution of the programs of the present application. circuit.

As shown in FIG. 3 , the device for determining the performance of the optical transmission system may further include a memory 303 . Wherein, the memory 303 is used for storing the application program code for executing the solution of the present application, and the execution is controlled by the processor 302 .

Memory 303 may be read-only memory (ROM) or other types of static storage devices that can store static information and instructions, random access memory (RAM), or other types of information and instructions It can also be an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM), or other optical disk storage, optical disk storage ( including compact discs, laser discs, optical discs, digital versatile discs, Blu-ray discs, etc.), magnetic disk storage media or other magnetic storage devices, or capable of carrying or storing desired program code in the form of instructions or data structures and capable of being stored by a computer any other medium taken, but not limited to this. The memory 303 can exist independently and is connected to the processor 302 through the bus 304 . The memory 303 may also be integrated with the processor 302 .

As shown in FIG. 3 , the apparatus for determining the performance of the optical transmission system may further include a communication interface 301 , wherein the communication interface 301 , the processor 302 , and the memory 303 may be coupled to each other, for example, through a bus 304 . The communication interface 301 is used for information interaction with other devices, for example, supporting the information interaction between the performance determination apparatus of the optical transmission system and other devices.

It should be pointed out that the device structure shown in FIG. 3 does not constitute a limitation on the performance determination device of the optical transmission system. Except for the components shown in FIG. 3 , the performance determination device of the optical transmission system may include More or fewer components, or a combination of certain components, or a different arrangement of components.

The method for determining the performance of the optical transmission system provided by the embodiments of the present application will be described below with reference to the accompanying drawings.

FIG. 4 is a schematic flowchart of a method for determining performance of an optical transmission system according to an exemplary embodiment. As shown in Figure 4, the performance determination method of the optical transmission system includes:

Step 41: The device for determining the performance of the optical transmission system acquires performance parameters of at least one optical amplification section.

The performance parameters include the output power of the optical amplifier section, the gain of the optical amplifier in the optical amplifier section, and the noise index of the optical amplifier in the optical amplifier section; an optical amplifier section includes a section of optical fiber and an optical amplifier; the gain of the optical amplifier in an optical amplifier section is a section of The sum of the fiber attenuation of the fiber and the attenuation margin reserved in an optical amplifier.

Specifically, the output power of the optical amplifier section is +1dBm, or +4dBm. According to the 58 formula (OSNR=58+P-L-NF-10lgN), it can be seen that the parameters affecting OSNR mainly include the output power P of each channel in the optical link, the fiber attenuation L between the optical amplifiers, the noise index NF of the optical amplifier, and the optical fiber attenuation. The number of fiber segments N in the link.

The communication industry standard YD/T 2485-2013N×100Gbit/s optical wavelength division multiplexing (dense wavelength division multiplexing, WDM) system technical requirements stipulates that the output power of each channel of the optical amplifier section is +1dBm on average, and the maximum is +4dBm. Therefore, based on this, this application stipulates that the single-channel output power of each optical amplifier is +1dBm or +4dBm, and the fiber attenuation L in the formula 58 is converted into the gain G of the optical amplifier, that is, fiber attenuation + attenuation margin = gain of the optical amplifier. The attenuation margin is reserved by a variable optical attenuator (variable optical attenuator, VOA) inside the optical amplifier.

This application takes an 80×100 Gbit/s transmission system carried on a G.692 optical fiber as an example. According to the above-mentioned standard, several different types of optical amplifiers are exemplarily set, as shown in Table 1 below.

Table 1

Of course, each index in Table 1 above can be set according to the actual situation of the project.

In this way, in order to ensure that the power at the output end of each optical amplifier is +1dBm, the selection of the optical amplifier can be carried out by using the reverse configuration method starting from the last stage of the optical amplifier.

Exemplarily, the optical amplifier section as shown in FIG. 5 includes an optical amplifier 1221, an optical amplifier 1222, and multiple fiber segments, and the optical amplifier 1221 and the optical amplifier 1222 are connected through fiber segments. The output of the optical amplifier 1222 is referred to as point A, the input is referred to as point B, and the output of the optical amplifier 1221 is referred to as point C. Then the power relationship between point A and point C is C-fiber attenuation-VOA=B, B+OA1222 gain=A, where VOA is the value reserved by the variable optical attenuator inside the optical amplifier 1222 (attenuation margin) , C represents the power of point C, B represents the power of point B, A represents the power of point A, and the OA1222 gain represents the gain of the optical amplifier 1222.

In this way, when the powers at points A and C are both +1dBm, fiber attenuation +VOA=gain of the optical amplifier, where the power at point B needs to be within the single-channel input power range of the optical amplifier 1222 .

Therefore, in this application, the configuration of the optical amplifier in the optical transmission system is selected according to the following principles:

(1) It is preferable to select an optical amplifier with a relatively small gain.

(2) The optical amplifier with a single-channel output power of +1dBm is preferred.

(3) If the fiber attenuation is large and the receiving end cannot reach the minimum input optical power, select an optical amplifier with a single-channel output power of +4dBm in the upstream.

(4) If the optical power of the receiving end is low, the optical amplifier works at the maximum gain, and the output of the standard optical power cannot be satisfied, then configure the second-stage optical amplifier, and set the VOA to make the second-stage optical amplifier work at the minimum gain to ensure Output Power.

(5) For the optical amplification section where the fiber attenuation is less than the minimum gain of the optical amplifier, the optical amplifier can be made to work at the minimum gain through VOA compensation.

After configuring the optical amplifiers in the optical transmission system, the performance determining device of the optical transmission system determines the performance parameters of at least one optical amplification section.

Step 42: The device for determining the performance of the optical transmission system determines the optical signal-to-noise ratio of at least one optical amplification section according to the performance parameters of the optical amplification section and a preset formula.

Specifically, according to the optical transmission system configured in step 41, the performance parameters of each optical amplification section can be obtained. According to this, it can be calculated that the optical signal-to-noise ratio of each optical amplification section satisfies the formula OSNR1=58+P-G-NF-10lg1=58+P-G-NF, where P represents the output power of the optical amplification section, and L represents the optical amplifier in the optical amplification section. The gain of NF represents the noise figure of the optical amplifier in the optical amplifier section.

其中，j∈N，OSNR_总1表示至少一个光放大段的光信噪比，N表示光放大段的数量，P_j表示第j个光放大段的输出功率，L_j表示第j个光放大段中光放大器的增益，NF_j表示第j个光放大段中光放大器的噪声指数。The optical signal-to-noise ratio of at least one optical amplification section satisfies the formula:

Among them, j∈N, OSNR _{always 1} represents the optical signal-to-noise ratio of at least one optical amplifier, N represents the number of optical amplifiers, _Pj represents the output power of the jth optical amplifier, and _Lj represents the jth optical amplifier is the gain of the optical amplifier in the segment, and NF _j represents the noise figure of the optical amplifier in the jth optical amplifier segment.

Optionally, when a ROADM site is included in the optical transmission system, since the optical loss of the core device add-drop multiplexer (ADM) of the ROADM site is relatively large, it is also necessary to configure part of the optical fiber at the upper and lower service sites. amplifier to compensate for the attenuation of optical power. Also, since the ROADM site has no fiber segment, the optical loss of the ADM is regarded as the fiber attenuation of the ROADM site. In addition, the ROADM site does not need margin compensation. Therefore, the fiber attenuation (the optical loss of the ADM) is related to the gain G of the optical amplifier. equal. In this way, in an optical transmission system including a ROADM site, the ADM and an optical amplifier in the ROADM site can be used as an optical amplification section to calculate the OSNR of at least one optical amplification section in the optical transmission system.

For example, if the uplink direction of the ROADM site includes two optical amplifiers, and the noise figures of the two optical amplifiers are both 8dB and the output power is +1dBm, and the optical loss of the ADM in the ROADM site is 8dB, then the uplink in the ROADM site The gain of the two optical amplifiers in the direction is 16dB, and the signal-to-noise ratio OSNR2=58+1-16-8=35dB introduced by each optical amplifier, the total signal-to-noise ratio OSNR3=-10×lg(2×10 ^-35/10 )=31.99dB.

i∈N，N表示光放大段的数量，OSNR_i表示第i个光放大段的光信噪比，第i个光放大段为主用光放大段，或者备用光放大段，P_i表示第i个光放大段的输出功率，L_i表示第i个光放大段中光放大器的增益，NF_i表示第i个光放大段中光放大器的噪声指数。Optionally, when the optical transmission system is configured with optical multiplex section protection (OMSP), the optical signal-to-noise ratio of at least one optical amplification section satisfies the formula: OSNR _{total 2} = -10lg10 ^-0.1×OSNRΔ , where , OSNR _{total 2} represents the optical signal-to-noise ratio of at least one optical amplifier section, OSNRΔ=min{OSNRΔ1,...,OSNRΔi,...,OSNRΔN}, OSNRΔi=OSNR ₁ +...+OSNR _i +...+OSNR _N ,

i∈N, N represents the number of optical amplification sections, OSNR _i represents the optical signal-to-noise ratio of the ith optical amplification section, the ith optical amplification section is the main optical amplification section, or the backup optical amplification section, and Pi represents the _ith optical amplification section The output power of the i optical amplification section, _{Li represents the gain of the optical amplifier in the ith optical amplification section, and NF i represents} the noise figure of the optical amplifier in the ith optical amplification section.

Specifically, OMSP is a technology of 1+1 protection on the optical cable. A 1:2 optical splitter is used at the transmitting end to send the optical signal through two independent optical cables, and an optical switch is used at the receiving end to select the two optical signals. receive. When the optical transmission system is working normally, the receiving end chooses to receive the signal of the main optical cable. When the main optical cable fails, the receiving end automatically switches to the standby optical cable to receive the signal.

Therefore, the OSNRs of the main optical link and the backup optical link are calculated independently, and the optical link with better OSNR is usually selected as the main one to obtain better transmission performance. For optical transmission systems including ROADM sites, most services need to be transmitted across multiple optical amplifier sections. If each optical amplifier section calculates OSNR based on the main optical link, it may cause a certain optical amplifier section to be switched to the standby time. , the transmission performance does not meet the standard; if each multiplex section calculates the OSNR according to the standby route, the calculated service OSNR will deteriorate sharply, and a large number of additional relay boards need to be configured, which wastes investment.

In view of the above problems, this application assumes that a service spans N optical amplifier sections, each optical amplifier section is configured with OMSP protection, and the corresponding OSNR values are: OSNR main 1, OSNR backup 1, OSNR main 2, OSNR backup 2... OSNR primary N, OSNR backup N.

Then the OSNR when the service is working normally should be obtained by accumulating the main OSNR value of each optical amplifier section, that is, the _total OSNR = -10×lg(10 ^{-(OSNR main 1+OSNR main 2+...+OSNR main N) /10} ), in order to simplify the expression, denote OSNR main 1+OSNR main 2+...+OSNR main N as OSNR△, then OSNR _{total main} =-10×lg(10 ^-OSNR△/10 ).

In this way, when the protection level of the service is required to be able to resist an optical cable failure (that is, any one of the N optical amplifier sections is switched to the standby, and the OSNR of the service can reach the standard), there are the following situations: when the first optical amplifier section is switched to the standby, OSNR△ becomes OSNR standby 1+OSNR main 2+…+OSNR main N, denoted as OSNR△1; when the second optical amplifier section is switched to standby, OSNR△ becomes OSNR main 1+OSNR standby 2+…+ OSNR main N, denoted as OSNR△2;...; When the Nth optical amplifier section is switched to standby, OSNR△ becomes OSNR main 1+OSNR main 2+...+OSNR standby N, denoted as OSNR△N.

In the same way, when the protection level of the service is required to be able to resist two optical cable failures (that is, any two of the N optical amplifier sections are switched to standby, and the OSNR of the service can reach the standard), there are the following situations: when the first optical amplifier section and the second optical amplifier section are When the two optical amplifier sections are switched to standby, OSNR△ becomes OSNR standby 1+OSNR standby 2+…+OSNR main N, denoted as OSNR△12; when the second optical amplifier section and the Nth optical amplifier section are switched to When in standby, OSNR△ becomes OSNR main 1+OSNR standby 2+…+OSNR standby N, denoted as OSNR△2N, etc., and so on.

According to the number of times that the protection level of the service can resist the optical cable failure, the corresponding OSNR△ set is calculated, and the smallest value in the OSNR△ set is taken as the final OSNR△ value to participate in the calculation of the OSNR _{total 2} , so as to determine the minimum Optical signal-to-noise ratio of an optical amplifier segment.

OSNR_业务表示业务对应的至少一个光放大段的光信噪比，OSNR上波表示业务在上波方向上的光信噪比，OSNR下波表示业务在下波方向上的光信噪比，OSNR△取OSNR△集合中最小的数值。For example, when the protection level of the service is required to be able to resist an optical cable failure, OSNR△=min{OSNR△1, OSNR△2,  …OSNR△N}. The optical signal-to-noise ratio of at least one optical amplifier section corresponding to the service is the sum of the upper-wave OSNR, the lower-wave OSNR, and the line transmission OSNR, that is,

The OSNR _service represents the optical signal-to-noise ratio of at least one optical amplifier section corresponding to the service, the OSNR add-on represents the optical signal-to-noise ratio of the service in the add-wave direction, the OSNR drop-wave represents the optical signal-to-noise ratio of the service in the drop direction, and OSNR△ Take the smallest value in the OSNR△ set.

In the above solution, the device for determining the performance of the transmission system determines the optical signal-to-noise ratio of at least one optical amplifying section according to the performance parameter of the optical amplifying section. The performance parameters of the optical amplification section in this application include the gain of the optical amplifier in the optical amplification section, and the gain of the optical amplifier in the optical amplification section is the sum of the fiber attenuation of the optical fiber in the optical amplification section and the attenuation margin reserved for the optical amplifier in the optical amplification section and. In this way, when determining the optical signal-to-noise ratio of at least one optical amplifier section, both the attenuation of the optical fiber in the optical amplifier section and the attenuation margin reserved in the optical amplifier are considered, avoiding the need to directly determine the optical fiber in the optical amplifier section. The optical fiber attenuation of the optical fiber, the determined performance result of the optical amplification section is the problem of the optical signal-to-noise ratio under the condition of uniform attenuation, which improves the accuracy of the performance determination result.

In this embodiment of the present application, the device for determining the performance of the optical transmission system may be divided into functional modules according to the above-mentioned method embodiments. For example, each functional module may be divided corresponding to each function, or two or more functions may be integrated into one in the processing module. The above-mentioned integrated modules can be implemented in the form of hardware, and can also be implemented in the form of software function modules. It should be noted that, the division of modules in the embodiments of the present application is schematic, and is only a logical function division, and there may be other division manners in actual implementation.

The methods provided by the embodiments of the present application are described in detail above with reference to FIGS. 4 to 5 . Hereinafter, the device for determining the performance of the optical transmission system provided by the embodiment of the present application will be described in detail with reference to FIG. 6 . It should be understood that the description of the apparatus embodiment corresponds to the description of the method embodiment. Therefore, for the content not described in detail, reference may be made to the above method embodiment, which is not repeated here for brevity.

FIG. 6 is a schematic structural diagram of an apparatus for determining performance of an optical transmission system according to an exemplary embodiment. Referring to FIG. 6 , the device for determining the performance of the optical transmission system includes an acquisition module 61 and a determination module 62 .

The acquisition module 61 is used to acquire performance parameters of at least one optical amplification section; the performance parameters include the output power of the optical amplification section, the gain of the optical amplifier in the optical amplification section, and the noise index of the optical amplifier in the optical amplification section; an optical amplification section includes a section of optical fiber and An optical amplifier; the gain of the optical amplifier in an optical amplifier section is the sum of the fiber attenuation of a section of optical fiber and the attenuation margin reserved in an optical amplifier; for example, as shown in FIG. The determination module 62 is configured to determine the optical signal-to-noise ratio of at least one optical amplification section according to the performance parameters of the optical amplification section acquired by the acquisition module 61 and the preset formula. For example, referring to FIG. 4 , the determination module 62 is used to execute step 42 .

Optionally, the output power of the optical amplifier section is positive 1 dBm, or positive 4 dBm.

其中，j∈N，OSNR_总1表示至少一个光放大段的光信噪比，N表示光放大段的数量，P_j表示第j个光放大段的输出功率，L_j表示第j个光放大段中光放大器的增益，NF_j表示第j个光放大段中光放大器的噪声指数。Optionally, the optical signal-to-noise ratio of at least one optical amplification section satisfies the formula:

Among them, j∈N, OSNR _{always 1} represents the optical signal-to-noise ratio of at least one optical amplifier, N represents the number of optical amplifiers, _Pj represents the output power of the jth optical amplifier, and _Lj represents the jth optical amplifier is the gain of the optical amplifier in the segment, and NF _j represents the noise figure of the optical amplifier in the jth optical amplifier segment.

i∈N，N表示光放大段的数量，OSNR_i表示第i个光放大段的光信噪比，第i个光放大段为主用光放大段，或者备用光放大段，P_i表示第i个光放大段的输出功率，L_i表示第i个光放大段中光放大器的增益，NF_i表示第i个光放大段中光放大器的噪声指数。Optionally, when the optical transmission system is configured with optical multiplexing section protection, the optical signal-to-noise ratio of at least one optical amplification section satisfies the formula: OSNR _{total 2} =-10lg10 ^-0.1×OSNRΔ , where OSNR _{total 2} represents at least one Optical signal-to-noise ratio of the optical amplification section, OSNRΔ=min{OSNRΔ1,...,OSNRΔi,...,OSNRΔN}, OSNRΔi=OSNR ₁ +...+OSNR _i +...+OSNR _N ,

i∈N, N represents the number of optical amplification sections, OSNR _i represents the optical signal-to-noise ratio of the ith optical amplification section, the ith optical amplification section is the main optical amplification section, or the backup optical amplification section, and Pi represents the _ith optical amplification section The output power of the i optical amplification section, _{Li represents the gain of the optical amplifier in the ith optical amplification section, and NF i represents} the noise figure of the optical amplifier in the ith optical amplification section.

In actual implementation, the acquiring module 61 and the determining module 62 may be implemented by the processor 302 shown in FIG. 3 calling program codes in the memory 303 . Alternatively, it can be implemented by the processor 302 shown in FIG. 3 through the communication interface 301. For the specific execution process, refer to the description of the performance determination method of the optical transmission system shown in FIG. 4, which will not be repeated here.

As mentioned above, the device for determining the performance of an optical transmission system provided by the embodiments of the present application can be used to implement the functions of the device for determining the performance of the optical transmission system in the methods implemented by the above embodiments of the present application. For the relevant parts of the application embodiments, if the specific technical details are not disclosed, please refer to the various embodiments of the application.

Another embodiment of the present application further provides a computer-readable storage medium, where instructions are stored in the computer-readable storage medium. When the instructions are executed on the performance determination device of the optical transmission system, the performance determination device of the optical transmission system, The performance determination method of the optical transmission system of any one of the embodiments shown in FIG. 4 to FIG. 5 is performed.

In another embodiment of the present application, a computer program product is also provided, the computer program product includes computer-executable instructions, and the computer-executable instructions are stored in a computer-readable storage medium. The processor of the device for determining the performance of the optical transmission system can read the computer-executable instructions from the computer-readable storage medium, and the processor executes the computer-executable instructions so that the device for determining the performance of the optical transmission system performs the operations shown in FIGS. 4-5 . The performance determination method of the optical transmission system of any one of the embodiments.

Regarding the apparatus in the above-mentioned embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the method, and will not be described in detail here.

From the description of the above embodiments, those skilled in the art can clearly understand that for the convenience and brevity of the description, only the division of the above functional modules is used as an example for illustration. In practical applications, the above functions can be allocated as required. It is completed by different functional modules, that is, the internal structure of the device is divided into different functional modules, so as to complete all or part of the functions described above.

In the several embodiments provided in this application, it should be understood that the disclosed apparatus and method may be implemented in other manners. For example, the device embodiments described above are only illustrative. For example, the division of the modules or units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components may be Incorporation may either be integrated into another device, or some features may be omitted, or not implemented. On the other hand, the shown or discussed mutual coupling or direct coupling or communication connection may be through some interfaces, indirect coupling or communication connection of devices or units, and may be in electrical, mechanical or other forms.

The units described as separate components may or may not be physically separated, and the components shown as units may be one physical unit or multiple physical units, that is, they may be located in one place, or may be distributed to multiple different places . Some or all of the units may be selected according to actual needs to achieve the purpose of the solution in this embodiment.

In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit. The above-mentioned integrated units may be implemented in the form of hardware, or may be implemented in the form of software functional units.

If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it may be stored in a readable storage medium. Based on such understanding, the technical solutions of the embodiments of the present application can be embodied in the form of software products in essence, or the parts that contribute to the prior art, or all or part of the technical solutions, which are stored in a storage medium , including several instructions to make a device (may be a single chip microcomputer, a chip, etc.) or a processor (processor) to execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage medium includes: a U disk, a removable hard disk, a ROM, a RAM, a magnetic disk, or an optical disk and other mediums that can store program codes.

The above are only specific embodiments of the present application, but the protection scope of the present application is not limited to this, and any changes or substitutions within the technical scope disclosed in the present application should be covered within the protection scope of the present application. . Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims (6)

1. A performance determination method for an optical transmission system, wherein the performance determination method comprises: Obtain performance parameters of at least one optical amplification section; the performance parameters include the output power of the optical amplification section, the gain of the optical amplifier in the optical amplification section, and the noise index of the optical amplifier in the optical amplification section; an optical amplification section includes a section of optical fiber and an optical amplifier; the gain of the optical amplifier in the one optical amplifier section is the sum of the optical fiber attenuation of the optical fiber section and the attenuation margin reserved in the one optical amplifier; determining the optical signal-to-noise ratio of the at least one optical amplifying section according to the performance parameters of the optical amplifying section and a preset formula; The optical signal-to-noise ratio of the at least one optical amplification section satisfies the formula:

where j∈N, OSNR _{always 1} represents the optical signal-to-noise ratio of the at least one optical amplifier segment, N represents the number of optical amplifier segments, _Pj represents the output power of the jth optical amplifier segment, and _Lj represents the The gain of the optical amplifier in the j optical amplifier sections, NF _j represents the noise figure of the optical amplifier in the jth optical amplifier section; In the case where the optical transmission system is configured with optical multiplexing section protection, the optical signal-to-noise ratio of the at least one optical amplification section satisfies the formula: OSNR _{total 2} =-10lg10 ^-0.1×OSNRΔ , where OSNR _{total 2} represents the optical signal-to-noise ratio of the at least one optical amplification section, OSNRΔ=min{OSNRΔ1,...,OSNRΔi,...,OSNRΔN}, OSNRΔi=OSNR ₁ + …+OSNR _i +…+OSNR _N ,

i∈N, N represents the number of optical amplification sections, OSNR _i represents the optical signal-to-noise ratio of the ith optical amplification section, the ith optical amplification section is the main optical amplification section, or the backup optical amplification section, and Pi represents the _ith optical amplification section The output power of the i optical amplification section, _{Li represents the gain of the optical amplifier in the i-th optical amplification section, and NF i represents} the noise figure of the optical amplifier in the i-th optical amplification section. 2. The performance determination method according to claim 1, characterized in that, The output power of the optical amplification section is positive 1 dBm, or positive 4 dBm. 3. A device for determining performance of an optical transmission system, wherein the device for determining performance comprises: an acquisition module for acquiring performance parameters of at least one optical amplifier section; the performance parameters include the output power of the optical amplifier section, the gain of the optical amplifier in the optical amplifier section, and the noise index of the optical amplifier in the optical amplifier section; an optical amplifier The section includes a section of optical fiber and an optical amplifier; the gain of the optical amplifier in the one optical amplification section is the sum of the optical fiber attenuation of the section of optical fiber and the attenuation margin reserved in the one optical amplifier; a determining module, configured to determine the optical signal-to-noise ratio of the at least one optical amplifying segment according to the performance parameters of the optical amplifying segment acquired by the acquiring module and a preset formula; The optical signal-to-noise ratio of the at least one optical amplification section satisfies the formula:

where j∈N, OSNR _{always 1} represents the optical signal-to-noise ratio of the at least one optical amplifier segment, N represents the number of optical amplifier segments, _Pj represents the output power of the jth optical amplifier segment, and _Lj represents the The gain of the optical amplifier in the j optical amplifier sections, NF _j represents the noise figure of the optical amplifier in the jth optical amplifier section; In the case where the optical transmission system is configured with optical multiplexing section protection, the optical signal-to-noise ratio of the at least one optical amplification section satisfies the formula: OSNR _{total 2} =-10lg10 ^-0.1×OSNRΔ , where OSNR _{total 2} represents the optical signal-to-noise ratio of the at least one optical amplification section, OSNRΔ=min{OSNRΔ1,...,OSNRΔi,...,OSNRΔN}, OSNRΔi=OSNR ₁ + …+OSNR _i +…+OSNR _N ,

i∈N, N represents the number of optical amplification sections, OSNR _i represents the optical signal-to-noise ratio of the ith optical amplification section, the ith optical amplification section is the main optical amplification section, or the backup optical amplification section, and Pi represents the _ith optical amplification section The output power of the i optical amplification section, _{Li represents the gain of the optical amplifier in the i-th optical amplification section, and NF i represents} the noise figure of the optical amplifier in the i-th optical amplification section. 4. The performance determination device according to claim 3, characterized in that: The output power of the optical amplification section is positive 1 dBm, or positive 4 dBm. 5. An apparatus for determining the performance of an optical transmission system, wherein the apparatus for determining the performance of the optical transmission system comprises: processor; a memory for storing the processor-executable instructions; Wherein, the processor is configured to execute the instructions to implement the method for determining the performance of an optical transmission system according to any one of claims 1-2. 6. A computer-readable storage medium on which instructions are stored, characterized in that, when the instructions in the computer-readable storage medium are executed by a processor of a performance determining device of an optical transmission system , so that the performance determination device of the optical transmission system executes the performance determination method of the optical transmission system according to any one of claims 1-2.

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