CN113114351B - Performance determination method and device of optical transmission system - Google Patents

Performance determination method and device of optical transmission system Download PDF

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CN113114351B
CN113114351B CN202110292454.0A CN202110292454A CN113114351B CN 113114351 B CN113114351 B CN 113114351B CN 202110292454 A CN202110292454 A CN 202110292454A CN 113114351 B CN113114351 B CN 113114351B
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optical
osnr
amplification
optical amplification
amplifier
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CN113114351A (en
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张传熙
陈文雄
王鹏
钟志刚
郑波
乔月强
杨伟
张二超
臧军超
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China United Network Communications Group Co Ltd
China Information Technology Designing and Consulting Institute Co Ltd
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China United Network Communications Group Co Ltd
China Information Technology Designing and Consulting Institute Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
    • H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
    • H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
    • H04B10/0795—Performance monitoring; Measurement of transmission parameters
    • H04B10/07953—Monitoring or measuring OSNR, BER or Q

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Abstract

The application provides a method and a device for determining the performance of an optical transmission system, relates to the technical field of communication, and at least solves the problem that the performance of the optical transmission system determined in the prior art is inaccurate. The method for determining the performance of the optical transmission system comprises the following steps: acquiring performance parameters of at least one light amplification segment; the performance parameters comprise the output power of the light amplification section, the gain of the light amplifier in the light amplification section and the noise index of the light amplifier in the light amplification section; an optical amplification section comprising an optical fiber and an optical amplifier; gain of the optical amplifier in an optical amplification section is the sum of the optical fiber attenuation of a section of optical fiber and the attenuation margin reserved in the optical amplifier; and determining the optical signal-to-noise ratio of at least one optical amplification section according to the performance parameters of the optical amplification sections and a preset formula.

Description

Performance determination method and device of optical transmission system
Technical Field
The present application relates to the field of communications technologies, and in particular, to a method and an apparatus for determining performance of an optical transmission system.
Background
Optical transmission is a technology for transmitting between a sender and a receiver in an optical signal form, and an optical transmission system has the advantages of strong anti-interference capability, high transmission speed, long transmission distance and the like. The performance of current optical transmission systems is usually measured by the Optical Signal Noise Ratio (OSNR). An algorithm for OSNR in the case of uniform attenuation of each optical amplification section in an optical transmission system is provided in the International Telecommunications Union (ITU) protocol ITU-TRec g.692. In practice, however, the attenuation of the individual optical amplification stages of an optical transmission system is not uniform, and the result is therefore not accurate.
Disclosure of Invention
The application provides a method and a device for determining the performance of an optical transmission system, which are used for at least solving the problem that the performance of the optical transmission system determined in the prior art is inaccurate. The technical scheme of the application is as follows:
according to a first aspect of the present application, there is provided a performance determination method of an optical transmission system, applied to a performance determination apparatus of the optical transmission system, the performance determination method including: the performance determining device of the transmission system obtains the performance parameters of at least one light amplification section and determines the optical signal-to-noise ratio of at least one light amplification section according to the performance parameters of the light amplification section and a preset formula. The performance parameters comprise 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, one optical amplification section comprises a section of optical fiber and the gain of the optical amplifier in one optical amplification section of the optical amplifier, and the gain is the sum of the optical fiber attenuation of one section of optical fiber and the attenuation margin reserved in one optical amplifier.
It can be seen that in the performance determining method of the transmission system provided by the present application, the performance determining device of the transmission system determines the osnr of at least one optical amplification section according to the performance parameter of the optical amplification section. The performance parameters of the optical amplification section in the present 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 optical 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. Therefore, when determining the optical signal-to-noise ratio of at least one optical amplification section, the attenuation condition of the optical fiber in the optical amplification section is considered, the reserved attenuation margin in the optical amplifier is also considered, the problem that the optical signal-to-noise ratio is determined under the condition that the performance result of the optical amplification section is uniform attenuation directly according to the optical fiber attenuation of the optical fiber in the optical amplification section is avoided, and the accuracy of the performance determination result is improved.
Optionally, the output power of the optical amplification section is positive 1dBm, or positive 4 dBm.
Optionally, the osnr of at least one of the light amplification stages satisfies the formula:
Figure BDA0002982836130000021
Figure BDA0002982836130000022
wherein j ∈ N, OSNRGeneral 1Representing the optical signal-to-noise ratio of at least one optical amplification stage, N representing the number of optical amplification stages, PjDenotes the output power of the j-th optical amplification stage, LjDenotes the gain, NF, of the optical amplifier in the j-th optical amplification stagejRepresenting the noise figure of the optical amplifier in the j-th optical amplification stage.
Optionally, in a case that the optical transmission system is configured with the optical multiplexing section protection, an optical signal-to-noise ratio of the at least one optical amplification section satisfies a formula: OSNRGeneral 2＝-10lg10-0.1×OSNRΔWherein OSNRGeneral 2Representing the optical signal-to-noise ratio of at least one optical amplification stage, OSNR Δ min { OSNR Δ 1, …, OSNR Δ i, …, OSNR Δ N }, OSNR Δ i ═ OSNR Δ N }1+…+OSNRi+…+OSNRN，
Figure BDA0002982836130000023
i ∈ N, N denotes the number of light amplification segments, OSNRiExpressing the optical signal-to-noise ratio of the ith optical amplification segment, wherein the ith optical amplification segment is a main optical amplification segment or a standby optical amplification segment, PiRepresenting the output power, L, of the ith optical amplification stageiDenotes the gain, NF, of the optical amplifier in the ith optical amplification stageiRepresenting the noise figure of the optical amplifier in the ith optical amplification stage.
According to a second aspect of the present application, there is provided a performance determination apparatus of an optical transmission system, the performance determination apparatus of the optical transmission system including an acquisition module and a determination module. An acquisition module for acquiring performance parameters of at least one light amplification segment; the performance parameters comprise the output power of the light amplification section, the gain of the light amplifier in the light amplification section and the noise index of the light amplifier in the light amplification section; an optical amplification section comprising an optical fiber and an optical amplifier; and the determining module is used for determining the optical signal to noise ratio of at least one optical amplification section according to the performance parameters of the optical amplification sections acquired by the acquiring module and a preset formula.
Optionally, the output power of the optical amplification section is positive 1dBm, or positive 4 dBm.
Optionally, the osnr of at least one of the light amplification stages satisfies the formula:
Figure BDA0002982836130000024
Figure BDA0002982836130000025
wherein j ∈ N, OSNRGeneral 1Representing the optical signal-to-noise ratio of at least one optical amplification stage, N representing the number of optical amplification stages, PjDenotes the output power of the j-th optical amplification stage, LjDenotes the gain, NF, of the optical amplifier in the j-th optical amplification stagejRepresenting the noise figure of the optical amplifier in the j-th optical amplification stage.
Optionally, in a case that the optical transmission system is configured with the optical multiplexing section protection, an optical signal-to-noise ratio of the at least one optical amplification section satisfies a formula: OSNRGeneral 2＝-10lg10-0.1×OSNRΔWherein OSNRGeneral 2Representing the optical signal-to-noise ratio of at least one optical amplification stage, OSNR Δ min { OSNR Δ 1, …, OSNR Δ i, …, OSNR Δ N }, OSNR Δ i ═ OSNR Δ N }1+…+OSNRi+…+OSNRN，
Figure BDA0002982836130000031
i ∈ N, N denotes the number of light amplification segments, OSNRiExpressing the optical signal-to-noise ratio of the ith optical amplification segment, wherein the ith optical amplification segment is a main optical amplification segment or a standby optical amplification segment, PiRepresenting the output power, L, of the ith optical amplification stageiDenotes the gain, NF, of the optical amplifier in the ith optical amplification stageiNoise finger for optical amplifier in ith optical amplification stageAnd (4) counting.
According to a third aspect of the present application, there is provided a performance determination apparatus of an optical transmission system, comprising: a processor and a memory for storing processor-executable instructions; wherein the processor is configured to execute the instructions to implement the method of determining performance of an optical transmission system as in the first aspect.
According to a fourth aspect of the present application, there is provided a computer-readable storage medium having stored thereon instructions that, when executed by a processor of a performance determination apparatus of an optical transmission system, enable the performance determination apparatus of the optical transmission system to execute the performance determination method of the optical transmission system as in the first aspect described above.
According to a fifth aspect of the present application, there is provided a computer program product containing computer instructions which, when executed by a processor of a performance determination apparatus of an optical transmission system, cause the performance determination apparatus of the optical transmission system to perform the performance determination method of the optical transmission system as in the first aspect.
It is understood that the performance determining apparatus, the computer readable storage medium, or the computer program product of any of the above-mentioned optical transmission systems is used for executing the above-mentioned methods, and therefore, the beneficial effects achieved by the method can refer to the beneficial effects of the above-mentioned methods and the corresponding schemes in the following detailed description, which are not described herein again.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the application and are not to be construed as limiting the application.
FIG. 1 is a schematic diagram of an optical transmission system according to an exemplary embodiment;
FIG. 2 is one of the schematic structural diagrams of a light amplification segment according to an exemplary embodiment;
fig. 3 is a schematic diagram showing a hardware configuration of a performance determination apparatus of an optical transmission system according to an exemplary embodiment;
FIG. 4 is a flow chart illustrating a method of determining performance of an optical transmission system in accordance with an exemplary embodiment;
FIG. 5 is a second schematic diagram of a light amplification stage according to an exemplary embodiment;
fig. 6 is a schematic structural diagram illustrating a performance determination apparatus of an optical transmission system according to an exemplary embodiment.
Detailed Description
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, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the embodiments of the present application, for convenience of clearly describing the technical solutions of the embodiments of the present application, terms such as "first" and "second" are used to distinguish the same items or similar items with substantially the same functions and actions. Those skilled in the art will appreciate that the terms "first," "second," etc. do not denote any order or quantity, nor do the terms "first," "second," etc. denote any order or importance. The technical features described in the first and second descriptions have no sequence or magnitude order.
In the embodiments of the present application, words such as "exemplary" or "for example" are used to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" or "e.g.," is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present relevant concepts in a concrete fashion for ease of understanding.
In the description of the present application, a "/" indicates a relationship in which the objects associated before and after are an "or", for example, a/B may indicate a or B; in the present application, "and/or" is only an association relationship describing an associated object, and means that there may be three relationships, for example, a and/or B, and may mean: a exists alone, A and B exist simultaneously, and B exists alone, wherein A and B can be singular or plural. Also, in the description of the present application, "a plurality" means two or more than two unless otherwise specified. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of the singular or plural items. For example, at least one (one) of a, b, or c, may represent: a, b, c, a-b, a-c, b-c, or a-b-c, wherein 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 a plurality may be two, three, four or more, which is not limited in the present application.
For ease of understanding, technical terms related to the embodiments of the present application will be first described.
The optical link is a link for transmitting audio signals, video signals, and data signals by using an optical fiber communication technique. Generally, the optical transceiver is composed of an optical transmitter (electrical signal/optical signal converter), an optical fiber, an optical receiver (optical signal/electrical signal converter), and other necessary optical devices (such as an optical amplifier, an optical connector, an optical splitter, and an optical attenuator).
The optical amplification section is a basis for forming an optical link, is used for realizing amplification/reduction of optical signals in the optical link, and generally comprises an optical fiber section and an optical amplifier.
Equation 58, is an algorithm for the OSNR of the light amplification stage provided in ITU-T Rec g.692. Wherein, OSNR is 58+ P-L-NF-10lgN, OSNR represents OSNR of the optical link, P represents output power per channel in the optical link, L represents optical fiber attenuation between optical amplifiers, NF represents noise index of the optical amplifiers, and N represents the number of optical fiber sections in the optical link.
A reconfigurable optical add-drop multiplexer (ROADM) refers to a network element (or referred to as a node or a site), and can implement dynamic control of an add service wavelength and a drop service wavelength through remote configuration.
With the gradual maturity of optical fiber communication technology, optical transmission systems have been increasingly widely used. Fig. 1 is a schematic diagram of an optical transmission system, which is shown in highly simplified form for ease of illustration and not limitation. As shown in fig. 1, the optical transmission system includes an optical transmitter 11, at least one optical amplification section 12, and an optical receiver 14, wherein the optical transmitter 11 and the optical receiver 14 transmit optical signals through the at least one optical amplification section 12.
Illustratively, fig. 2 is a schematic diagram of a structure of the light amplification section 12, wherein the light amplification section 12 comprises an optical fiber section 121 and an optical amplifier 122. Wherein the fiber segment 121 is capable of spanning relatively long geographic distances (e.g., 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 configured to convert other signals into optical signals and transmit the optical signals to the optical amplification section 12; at least one optical amplification section 12 for transmitting the optical signal transmitted by the optical transmitter 11; the optical receiver 14 is configured to receive the optical signal transmitted by the optical amplification section 12 and convert the optical signal into another signal, thereby completing transmission of the other signal.
Optionally, as shown in fig. 1, the optical transmission system may further include a branching unit 13. For example, branching unit 13 may include a ROADM site, or other suitable optical filter/component (e.g., may include circuitry for remote monitoring and control) for transmitting and receiving channel wavelengths from a branch path (e.g., branch path 131).
The performance of current optical transmission systems is usually measured by OSNR. An algorithm for OSNR with uniform attenuation of each optical amplification section in an optical transmission system is provided in ITU-T Rec g.692. However, in practical applications, the signal transmission is affected by the aging of the optical fiber, the loss of the connector, and the like, so that the attenuation of each optical amplification section of the optical transmission system is not uniform, and the determined result is not accurate.
In view of the above problems, the present application provides a performance determining method for an optical transmission system, which can consider the attenuation condition of an optical fiber in an optical amplification section and the attenuation margin reserved in an optical amplifier when determining the optical signal-to-noise ratio of at least one optical amplification section, avoid the problem that the performance result of the determined optical amplification section is the optical signal-to-noise ratio under the condition of uniform attenuation directly according to the optical fiber attenuation of the optical fiber in the optical amplification section, and improve the accuracy of the performance determining result.
Fig. 3 is a schematic structural diagram illustrating a performance determination apparatus of an optical transmission system according to an exemplary embodiment. The performance determination apparatus of the optical transmission system may include a processor 302, and the processor 302 is configured to execute the application program code, so as to implement the performance determination method of the optical transmission system in the present application.
The processor 302 may be a Central Processing Unit (CPU), a microprocessor, an application-specific integrated circuit (ASIC), or one or more ics for controlling the execution of programs in accordance with the present disclosure.
As shown in fig. 3, the performance determination apparatus of the optical transmission system may further include a memory 303. The memory 303 is used for storing application program codes for executing the scheme of the application, and the processor 302 is used for controlling the execution.
The memory 303 may be, but is not limited to, a read-only memory (ROM) or other type of static storage device that may store static information and instructions, a Random Access Memory (RAM) or other type of dynamic storage device that may store information and instructions, 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 disc, laser disc, optical disc, digital versatile disc, blu-ray disc, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer. The memory 303 may be self-contained and coupled to the processor 302 via a bus 304. The memory 303 may also be integrated with the processor 302.
As shown in fig. 3, the performance determining apparatus 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, via a bus 304. The communication interface 301 is used for information interaction with other devices, for example, information interaction between a performance determination apparatus supporting an optical transmission system and other devices.
It is to be noted that the apparatus configuration shown in fig. 3 does not constitute a limitation of the performance determination means of the optical transmission system, and the performance determination means of the optical transmission system may include more or less components than those shown in fig. 3, or combine some components, or arrange different components, in addition to the components shown in fig. 3.
A method for determining performance of an optical transmission system according to an embodiment of the present application is described below with reference to the accompanying drawings.
Fig. 4 is a flowchart illustration of a method of determining performance of an optical transmission system, according to an example embodiment. As shown in fig. 4, the method for determining the performance of the optical transmission system includes:
step 41: a performance determining apparatus of an optical transmission system acquires a performance parameter of at least one optical amplification section.
Wherein the performance parameters comprise output power of the light amplification section, gain of the light amplifier in the light amplification section, and noise index of the light amplifier in the light amplification section; an optical amplification section comprising an optical fiber and an optical amplifier; the gain of an optical amplifier in an optical amplification section is the sum of the optical fiber attenuation of a section of optical fiber and the attenuation margin reserved in an optical amplifier.
Specifically, the output power of the optical amplification section is +1dBm, or +4 dBm. According to the formula 58 (OSNR 58+ P-L-NF-10lgN), the parameters affecting the OSNR mainly include the output power P per channel in the optical link, the fiber attenuation L between the optical amplifiers, the noise figure NF of the optical amplifiers, and the number N of fiber segments in the optical link.
The communication industry standard YD/T2485-2013 Nx 100Gbit/s optical Wavelength Division Multiplexing (WDM) system technical requirements stipulate that the average output power of each channel of an optical amplification section is +1dBm, and the maximum output power is +4 dBm. Therefore, in the present application, the single-channel output power of each optical amplifier is specified to be +1dBm or +4dBm, and the fiber attenuation L in the formula 58 is converted into the gain G of the optical amplifier, that is, the fiber attenuation + attenuation margin is equal to the gain of the optical amplifier. Wherein the attenuation margin is reserved by a Variable Optical Attenuator (VOA) inside the optical amplifier.
The present application exemplifies an 80 x 100Gbit/s transmission system carried on g.692 optical fibers, and illustratively sets several different optical amplifier types according to the above-mentioned standards, as shown in table 1 below.
TABLE 1
Figure BDA0002982836130000081
Of course, all the indexes in the table 1 can be set according to the actual engineering situation.
Thus, in order to ensure that the output power of each optical amplifier is +1dBm, the optical amplifier can be selected by adopting a reverse configuration method from the last stage of the optical amplifier.
Illustratively, in the optical amplification segment shown in fig. 5, the optical amplifier 1221, the optical amplifier 1222 and the multi-segment optical fiber segment are included, and the optical amplifier 1221 and the optical amplifier 1222 are connected by the optical fiber segment. The output of the optical amplifier 1222 is denoted as point a, the input is denoted as point B, and the output of the optical amplifier 1221 is denoted as point C. The power relationship between point a and point C is C-fiber attenuation-VOA (B), and B + OA1222 gain (a), where VOA is a value (attenuation margin) reserved for a variable optical attenuator inside the optical amplifier 1222, C is the power of point C, B is the power of point B, a is the power of point a, and OA1222 gain is the gain of the optical amplifier 1222.
Thus, in the case where the power at both points a and C is +1dBm, the fiber attenuation + VOA is equal to the gain of the optical amplifier, where the power at point B is required to be within the single-channel input power range of the optical amplifier 1222.
Therefore, the configuration of the optical amplifier in the optical transmission system in the present application is selected according to the following principle:
(1) an optical amplifier having a relatively small gain is preferably selected.
(2) An optical amplifier with a single channel output power of +1dBm is preferably selected.
(3) If the attenuation of the optical fiber is large and the receiving end cannot reach the minimum input optical power, an optical amplifier with single-channel output power of +4dBm is selected 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 met, the second-stage optical amplifier is configured, and the second-stage optical amplifier works at the minimum gain through the setting of the VOA, so that the output power is ensured.
(5) For the optical amplification section with the optical fiber attenuation smaller than the minimum gain of the optical amplifier, the optical amplifier is operated at the minimum gain through VOA compensation.
After configuring the optical amplifier in the optical transmission system, a performance determining apparatus of the optical transmission system determines a performance parameter of at least one optical amplification section.
Step 42: a performance determining device of the optical transmission system determines an optical signal-to-noise ratio of at least one optical amplification section according to a performance parameter of the optical amplification section and a preset formula.
Specifically, according to the optical transmission system configured in step 41, the performance parameter of each optical amplification section can be obtained. From this, the OSNR1 ═ 58+ P-G-NF-10lg1 ═ 58+ P-G-NF can be calculated, where P denotes the output power of the optical amplification stage, L denotes the gain of the optical amplifier in the optical amplification stage, and NF denotes the noise figure of the optical amplifier in the optical amplification stage.
The optical signal-to-noise ratio of the at least one optical amplification segment satisfies the formula:
Figure BDA0002982836130000091
wherein j ∈ N, OSNRGeneral 1Representing the optical signal-to-noise ratio of at least one optical amplification stage, N representing the number of optical amplification stages, PjDenotes the output power of the j-th optical amplification stage, LjDenotes the gain, NF, of the optical amplifier in the j-th optical amplification stagejRepresenting the noise figure of the optical amplifier in the j-th optical amplification stage.
Optionally, when the optical transmission system includes a ROADM site, because an optical loss of an add-drop multiplexer (ADM) of the ROADM site is relatively large, a partial optical amplifier is also required to be configured at the upper and lower service sites to compensate for the attenuation of optical power. Since the ROADM site has no fiber segment, the optical loss of the ADM is regarded as the optical fiber attenuation of the ROADM site, and the optical fiber attenuation (the optical loss of the ADM) is equal to the gain G of the optical amplifier since the ROADM site does not need margin compensation. Thus, in an optical transmission system comprising ROADM sites, the ADM in a ROADM site and one optical amplifier can be used as one optical amplification section to calculate the OSNR of at least one optical amplification section in the optical transmission system.
For example, two optical amplifiers are included in the add direction of the ROADM site, and the noise figure of both optical amplifiers is 8dB, the output power is +1dBm, and the optical loss of the ADM in the ROADM site is 8dB, then the gains of both optical amplifiers are 16dB in the add direction of the ROADM site, and the signal-to-noise ratio OSNR2 introduced by each optical amplifier is 58+ 1-16-8-35 dB, and the total signal-to-noise ratio OSNR3 is-10 × lg (2 × 10)-35/10)＝31.99dB。
Optionally, in a case where the optical transmission system is configured with an Optical Multiplexing Section Protection (OMSP), an optical signal-to-noise ratio of the at least one optical amplification section satisfies a formula: OSNRGeneral 2＝-10lg10-0.1×OSNRΔWherein OSNRGeneral 2Representing the optical signal-to-noise ratio of at least one optical amplification stage, OSNR Δ min { OSNR Δ 1, …, OSNR Δ i, …, OSNR Δ N }, OSNR Δ i ═ OSNR Δ N }1+…+OSNRi+…+OSNRN，
Figure BDA0002982836130000101
i ∈ N, N denotes the number of light amplification segments, OSNRiExpressing the optical signal-to-noise ratio of the ith optical amplification segment, wherein the ith optical amplification segment is a main optical amplification segment or a standby optical amplification segment, PiRepresenting the output power, L, of the ith optical amplification stageiDenotes the gain, NF, of the optical amplifier in the ith optical amplification stageiRepresenting the noise figure of the optical amplifier in the ith optical amplification stage.
Specifically, the OMSP is a technique for performing 1+1 protection on an optical cable, and uses 1: 2 the optical splitter sends out the optical signals through two independent optical cables, and an optical switch is used at a receiving end to selectively receive the two optical signals. When the optical transmission system works normally, the receiving end selects to receive the signal of the main optical cable, and when the main optical cable breaks down, the receiving end automatically switches to the standby optical cable to receive the signal.
Therefore, the OSNRs of the active optical link and the standby optical link are calculated independently, and an optical link with a better OSNR is usually selected as the active optical link to obtain better transmission performance. For an optical transmission system including a ROADM site, most services need to be transmitted across a plurality of optical amplification sections, if each optical amplification section calculates OSNR according to a main optical link, the situation that the transmission performance does not reach the standard when a certain optical amplification section is switched to standby can be caused; if each multiplexing section calculates the OSNR according to the standby route, the calculated service OSNR is rapidly degraded, a large number of relay boards need to be additionally configured, and investment is wasted.
For the above problem, the present application assumes that a certain service spans N optical amplification segments, each optical amplification segment is configured with OMSP protection, and the corresponding OSNR value is: OSNR main 1, OSNR main 2 … … OSNR main N, OSNR N.
The OSNR when the service normally works should be obtained by accumulating the main OSNR values of each optical amplification segment, i.e. the OSNRGeneral owner＝-10×lg(10- (OSNR main 1+ OSNR main 2+ … + OSNR main N)/10) For the sake of simplicity, the OSNR Δ is expressed by OSNR main 1+ OSNR main 2+ … + OSNR main N, and the OSNR Δ is expressed as the OSNRGeneral owner＝-10×lg(10-OSNR△/10)。
Thus, when the protection level of the service requires that the service can resist a fault of the optical cable (i.e. any one of the N optical amplification sections is switched to standby, and the OSNR of the service can reach the standard), the following conditions are as follows: when the first optical amplification section is switched to standby, the OSNR delta becomes OSNR standby 1+ OSNR main 2+ … + OSNR main N, and is marked as OSNR delta 1; when the second optical amplification section is switched to standby, the OSNR delta becomes OSNR main 1+ OSNR standby 2+ … + OSNR main N, and is marked as OSNR delta 2; … …, respectively; when the Nth optical amplification section is switched to standby, the OSNR delta becomes OSNR main 1+ OSNR main 2+ … + OSNR standby N, and is marked as OSNR delta N.
Similarly, when the protection level of the service requires that the optical cable fault can be resisted twice (that is, any two of the N optical amplification sections are switched to standby, and the OSNR of the service can reach the standard), the following conditions are provided: when the first optical amplification section and the second optical amplification section are switched to standby, the OSNR delta becomes OSNR standby 1+ OSNR standby 2+ … + OSNR main N, and is marked as OSNR delta 12; when the second optical amplification segment and the nth optical amplification segment are switched to standby, the OSNR Δ becomes OSNR main 1+ OSNR standby 2+ … + OSNR standby N, which is marked as OSNR Δ 2N, and so on.
According to the protection level requirement of the service, the number of times of resisting the optical cable fault is calculated, a corresponding OSNR delta set is calculated, and the minimum value in the OSNR delta set is taken as the final OSNR delta value to participate in the OSNRGeneral 2To determine the optical signal-to-noise ratio of at least one optical amplification section corresponding to the service.
For example, when the protection level of the service requires resistance to a cable fault, OSNR Δ min { OSNR Δ 1, OSNR Δ 2, … OSNR Δ N }. Wherein, the optical signal-to-noise ratio of at least one optical amplification segment corresponding to the service is the sum of the upper wave OSNR, the lower wave OSNR and the line transmission OSNR, namely
Figure BDA0002982836130000111
OSNRBusinessAnd the OSNR is used for representing the optical signal-to-noise ratio of at least one optical amplification section corresponding to the service, the OSNR upper wave represents the optical signal-to-noise ratio of the service in the upper wave direction, the OSNR lower wave represents the optical signal-to-noise ratio of the service in the lower wave direction, and the OSNR delta is the minimum value in an OSNR delta set.
In the above solution, the performance determining device of the transmission system determines the osnr of at least one of the optical amplification sections according to the performance parameter of the optical amplification section. The performance parameters of the optical amplification section in the present 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 optical 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. Therefore, when determining the optical signal-to-noise ratio of at least one optical amplification section, the attenuation condition of the optical fiber in the optical amplification section is considered, the reserved attenuation margin in the optical amplifier is also considered, the problem that the optical signal-to-noise ratio is determined under the condition that the performance result of the optical amplification section is uniform attenuation directly according to the optical fiber attenuation of the optical fiber in the optical amplification section is avoided, and the accuracy of the performance determination result is improved.
In the embodiment of the present application, the performance determining apparatus of the optical transmission system may perform functional module division according to the method embodiment, for example, each functional module may be divided corresponding to each function, or two or more functions may be integrated into one processing module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. It should be noted that, in the embodiment of the present application, the division of the module is schematic, and is only one logic function division, and there may be another division manner in actual implementation.
The method provided by the embodiment of the present application is described in detail above with reference to fig. 4-5. Hereinafter, a performance determination apparatus of an optical transmission system according to an 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 embodiments corresponds to the description of the method embodiments, and therefore, for brevity, details are not repeated here, since the details that are not described in detail may be referred to the above method embodiments.
Fig. 6 is a schematic structural diagram illustrating a performance determination apparatus of an optical transmission system according to an exemplary embodiment. Referring to fig. 6, the performance determination apparatus of the optical transmission system includes an acquisition module 61 and a determination module 62.
An obtaining module 61 for obtaining performance parameters of at least one light amplification segment; the performance parameters comprise the output power of the light amplification section, the gain of the light amplifier in the light amplification section and the noise index of the light amplifier in the light amplification section; an optical amplification section comprising an optical fiber and an optical amplifier; gain of the optical amplifier in an optical amplification section is the sum of the optical fiber attenuation of a section of optical fiber and the attenuation margin reserved in the optical amplifier; for example, referring to fig. 4, an obtaining module 61 is configured to execute step 41. And the determining module 62 is configured to determine an optical signal-to-noise ratio of at least one optical amplification segment according to the performance parameter of the optical amplification segment acquired by the acquiring module 61 and a preset formula. For example, referring to FIG. 4, a determination module 62 is provided for performing step 42.
Optionally, the output power of the optical amplification section is positive 1dBm, or positive 4 dBm.
Optionally, the osnr of at least one of the light amplification stages satisfies the formula:
Figure BDA0002982836130000131
Figure BDA0002982836130000132
wherein j ∈ N, OSNRGeneral 1Representing the optical signal-to-noise ratio of at least one optical amplification stage, N representing the number of optical amplification stages, PjDenotes the output power of the j-th optical amplification stage, LjDenotes the gain, NF, of the optical amplifier in the j-th optical amplification stagejRepresenting the noise figure of the optical amplifier in the j-th optical amplification stage.
Optionally, in a case that the optical transmission system is configured with the optical multiplexing section protection, an optical signal-to-noise ratio of the at least one optical amplification section satisfies a formula: OSNRGeneral 2＝-10lg10-0.1×OSNRΔWherein OSNRGeneral 2Representing the optical signal-to-noise ratio of at least one optical amplification stage, OSNR Δ min { OSNR Δ 1, …, OSNR Δ i, …, OSNR Δ N }, OSNR Δ i ═ OSNR Δ N }1+…+OSNRi+…+OSNRN，
Figure BDA0002982836130000133
i ∈ N, N denotes the number of light amplification segments, OSNRiExpressing the optical signal-to-noise ratio of the ith optical amplification segment, wherein the ith optical amplification segment is a main optical amplification segment or a standby optical amplification segment, PiRepresenting the output power, L, of the ith optical amplification stageiDenotes the gain, NF, of the optical amplifier in the ith optical amplification stageiRepresenting the noise figure of the optical amplifier in the ith optical amplification stage.
In actual implementation, the obtaining 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, the performance may be implemented by the processor 302 shown in fig. 3 through the communication interface 301, and the specific implementation process may refer to the description of the performance determination method portion of the optical transmission system shown in fig. 4, which is not described herein again.
As described above, the performance determining apparatus of the optical transmission system provided in the embodiments of the present application can be used to implement the function of the performance determining apparatus of the optical transmission system in the method implemented in the embodiments of the present application, and for convenience of description, only the parts related to the embodiments of the present application are shown, and details of the specific technology are not disclosed, please refer to the embodiments of the present application.
Another embodiment of the present application further provides a computer-readable storage medium, in which instructions are stored, and when the instructions are executed on a performance determination apparatus of an optical transmission system, the performance determination apparatus of the optical transmission system executes a performance determination method of the optical transmission system according to any one of the embodiments shown in fig. 4 to fig. 5.
In another embodiment of the present application, there is also provided a computer program product comprising computer executable instructions stored in a computer readable storage medium. The processor of the performance determination apparatus of the optical transmission system may read the computer-executable instructions from the computer-readable storage medium, and the processor executes the computer-executable instructions to cause the performance determination apparatus of the optical transmission system to perform the performance determination method of the optical transmission system according to any one of the embodiments shown in fig. 4 to 5.
With regard to the apparatus in the above-described embodiment, the specific manner in which each module performs the operation has been described in detail in the embodiment related to the method, and will not be elaborated here.
Through the above description of the embodiments, it is clear to those skilled in the art that, for convenience and simplicity of description, the foregoing division of the functional modules is merely used as an example, and in practical applications, the above function distribution may be completed by different functional modules according to needs, that is, the internal structure of the device may be divided into different functional modules to complete all or part of the above described functions.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described device embodiments are merely illustrative, and for example, the division of the modules or units is only one logical functional division, and there may be other divisions when actually implemented, for example, a plurality of units or components may be combined or may be integrated into another device, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may be one physical unit or a plurality of physical units, that is, may be located in one place, or may be distributed in a plurality of different places. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a readable storage medium. Based on such understanding, the technical solutions of the embodiments of the present application may be essentially or partially contributed to by the prior art, or all or part of the technical solutions may be embodied in the form of a software product, where the software product is stored in a storage medium and includes several instructions to enable a device (which may be a single chip, a chip, or the like) or a processor (processor) to execute all or part of the steps of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a U disk, a removable hard disk, a ROM, a RAM, a magnetic disk, or an optical disk.
The above description is only an embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions within the technical scope of the present disclosure should be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (6)

1. A performance determination method for an optical transmission system, the performance determination method comprising:
acquiring performance parameters of at least one light amplification segment; the performance parameters comprise output power of a light amplification section, gain of an optical amplifier in the light amplification section, and noise figure of the optical amplifier in the light amplification section; an optical amplification section comprising an optical fiber and an optical amplifier; the gain of the optical amplifier in the optical amplification section is the sum of the optical fiber attenuation of the section of optical fiber and the attenuation margin reserved in the optical amplifier;
determining the optical signal-to-noise ratio of the at least one optical amplification section according to the performance parameters of the optical amplification sections and a preset formula;
the optical signal-to-noise ratio of the at least one optical amplification segment satisfies the formula:
Figure FDA0003486492020000011
wherein j ∈ N, OSNRGeneral 1Representing the optical signal-to-noise ratio of said at least one optical amplification segment, N representing the number of optical amplification segments, PjDenotes the output power of the j-th optical amplification stage, LjRepresenting the gain, NF, of the optical amplifier in said j-th optical amplification stagejRepresenting a noise figure of an optical amplifier in the jth optical amplification stage;
under the condition that the optical transmission system is provided with the optical multiplexing section protection, the optical signal-to-noise ratio of the at least one optical amplification section satisfies the formula:
OSNRgeneral 2＝-10lg10-0.1×OSNRΔWherein OSNRGeneral 2Representing the optical signal-to-noise ratio, OSNR delta ═ of said at least one optical amplification stagemin{OSNRΔ1,…,OSNRΔi,…,OSNRΔN}，OSNRΔi＝OSNR1+…+OSNRi+…+OSNRN，
Figure FDA0003486492020000012
i ∈ N, N denotes the number of light amplification segments, OSNRiExpressing the optical signal-to-noise ratio of the ith optical amplification segment, wherein the ith optical amplification segment is a main optical amplification segment or a standby optical amplification segment, PiRepresenting the output power, L, of the ith optical amplification stageiRepresenting the gain, NF, of the optical amplifier in said ith optical amplification stageiRepresenting the noise figure of the optical amplifier in the ith optical amplification stage.
2. The performance determination method of claim 1,
the output power of the optical amplification section is positive 1dBm or positive 4 dBm.
3. A performance determining apparatus of an optical transmission system, characterized in that the performance determining apparatus comprises:
an acquisition module for acquiring performance parameters of at least one light amplification segment; the performance parameters comprise output power of a light amplification section, gain of an optical amplifier in the light amplification section, and noise figure of the optical amplifier in the light amplification section; an optical amplification section comprising an optical fiber and an optical amplifier; the gain of the optical amplifier in the optical amplification section is the sum of the optical fiber attenuation of the section of optical fiber and the attenuation margin reserved in the optical amplifier;
the determining module is used for determining the optical signal to noise ratio of the at least one optical amplification section according to the performance parameters of the optical amplification sections acquired by the acquiring module and a preset formula;
the optical signal-to-noise ratio of the at least one optical amplification segment satisfies the formula:
Figure FDA0003486492020000021
wherein j ∈ N, OSNRGeneral 1To representThe optical signal-to-noise ratio of the at least one optical amplification segment, N representing the number of optical amplification segments, PjDenotes the output power of the j-th optical amplification stage, LjRepresenting the gain, NF, of the optical amplifier in said j-th optical amplification stagejRepresenting a noise figure of an optical amplifier in the jth optical amplification stage;
under the condition that the optical transmission system is provided with the optical multiplexing section protection, the optical signal-to-noise ratio of the at least one optical amplification section satisfies the formula:
OSNRgeneral 2＝-10lg10-0.1×OSNRΔWherein OSNRGeneral 2Representing the optical signal-to-noise ratio of the at least one optical amplification stage, OSNR Δ min { OSNR Δ 1, …, OSNR Δ i, …, OSNR Δ N }, OSNR Δ i ═ OSNR Δ N }1+…+OSNRi+…+OSNRN，
Figure FDA0003486492020000022
i ∈ N, N denotes the number of light amplification segments, OSNRiExpressing the optical signal-to-noise ratio of the ith optical amplification segment, wherein the ith optical amplification segment is a main optical amplification segment or a standby optical amplification segment, PiRepresenting the output power, L, of the ith optical amplification stageiRepresenting the gain, NF, of the optical amplifier in said ith optical amplification stageiRepresenting the noise figure of the optical amplifier in the ith optical amplification stage.
4. The performance determination apparatus of claim 3,
the output power of the optical amplification section is positive 1dBm or positive 4 dBm.
5. A performance determination apparatus of an optical transmission system, characterized by comprising:
a processor;
a memory for storing the processor-executable instructions;
wherein the processor is configured to execute the instructions to implement the method of determining performance of an optical transmission system according to any of claims 1-2.
6. A computer-readable storage medium having instructions stored thereon, wherein the instructions in the computer-readable storage medium, when executed by a processor of a performance determination apparatus of an optical transmission system, cause the performance determination apparatus of the optical transmission system to perform the performance determination method of the optical transmission system according to any one of claims 1-2.
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