WO2023123651A1 - Procédé et appareil de détection de diaphonie de fibre optique multicœur, et support de stockage - Google Patents

Procédé et appareil de détection de diaphonie de fibre optique multicœur, et support de stockage Download PDF

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WO2023123651A1
WO2023123651A1 PCT/CN2022/078322 CN2022078322W WO2023123651A1 WO 2023123651 A1 WO2023123651 A1 WO 2023123651A1 CN 2022078322 W CN2022078322 W CN 2022078322W WO 2023123651 A1 WO2023123651 A1 WO 2023123651A1
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fiber
coupling
coupled
optical fiber
crosstalk
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PCT/CN2022/078322
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Chinese (zh)
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向练
潘洪峰
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苏州大学
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
    • G06F17/10—Complex mathematical operations
    • G06F17/11—Complex mathematical operations for solving equations, e.g. nonlinear equations, general mathematical optimization problems
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
    • G06F17/10—Complex mathematical operations
    • G06F17/18—Complex mathematical operations for evaluating statistical data, e.g. average values, frequency distributions, probability functions, regression analysis

Definitions

  • the invention relates to the technical field of optical fiber manufacturing, in particular to a multi-core optical fiber crosstalk detection method, equipment, device and computer storage medium.
  • optical fiber communication With the birth of optical fiber in 1966, after more than 40 years of development, it has become the cornerstone of information exchange in the world. From single-mode fiber to multi-mode fiber, from single-wavelength to multi-wavelength fiber, the development of optical fiber communication is advancing steadily. With the advent of wavelength division multiplexing (WDM), especially dense wavelength division multiplexing (DWDM) technology, the transmission capacity of optical fiber has increased several times to dozens of times compared with before, and optical fiber communication has entered the high-speed and large-capacity optical fiber communication. stage of development. However, with the development of technologies such as cloud computing, Internet of Things, and big data, business demands such as video conferencing, remote monitoring, and remote fault diagnosis are increasing day by day.
  • WDM wavelength division multiplexing
  • DWDM dense wavelength division multiplexing
  • S-SCF single-core fiber
  • MCF multi-core fiber
  • FMF few-mode fiber
  • FM-MCF few-mode multi-core fiber
  • the technical problem to be solved by the present invention is to overcome the problem in the prior art that the nonlinear influence of the fiber is not considered.
  • the present invention provides a multi-core optical fiber crosstalk detection method, equipment, device and computer storage medium, including:
  • j is the imaginary number unit
  • a m (z) and A n (z) are the slow-varying complex amplitudes of the electric field of the coupling fiber m and the incident fiber n, respectively
  • ⁇ m is the self-coupling coefficient for nonlinear effects
  • N is the core Quantity
  • C mn is the mode coupling coefficient from the incident fiber n to the coupling fiber m
  • ⁇ f(z) is a phase function describing fiber bending and twist
  • the multi-core optical fiber crosstalk value including nonlinear influence is calculated by using the transmitting power and the coupling power of the coupling optical fiber.
  • the calculation of the total average value of the coupled fiber electric field analytical solution by using the fiber parameters through the coupled mode equation includes:
  • the total average value of the coupled optical fiber electric field analytical solution is calculated by using the obtained coupled optical fiber electric field analytical solution.
  • the total average value of the coupled optical fiber electric field analytical solution is:
  • the rewriting the total average value of the analytical solution of the coupling optical fiber electric field to obtain the coupling power equation including nonlinear effects includes:
  • the electric field analytical solution at the initial point of the optical waveguide is similar to the electric field analytical solution at any point of the optical waveguide, and A n (0) and A m (0) in the total average value of the coupled optical fiber electric field analytical solution are replaced by are A n (z) and A m (z);
  • the calculation of the coupling power of the coupling fiber by using the coupling power equation including nonlinear effects includes:
  • the coupling power of the coupling fiber is obtained as:
  • the calculation of multi-core fiber crosstalk estimation including nonlinear effects by using the transmitting power and the coupling power of the coupling fiber includes:
  • ⁇ n is the self-coupling coefficient of the nonlinear influence
  • PL is the transmission power
  • z is the transmission length of the wave amplitude
  • the present invention also provides a multi-core optical fiber crosstalk detection device, including:
  • the nonlinear influence introduction module is used to introduce the Kerr nonlinear effect to redefine the linear coupled mode equation, and obtain the coupled mode equation including nonlinear influence:
  • j is the imaginary number unit
  • a m (z) and A n (z) are the slow-varying complex amplitudes of the electric field of the coupling fiber m and the incident fiber n, respectively
  • ⁇ m is the self-coupling coefficient for nonlinear effects
  • N is the core Quantity
  • C mn is the mode coupling coefficient from the incident fiber n to the coupling fiber m
  • ⁇ f(z) is a phase function describing fiber bending and twist
  • the total average value calculation module of the electric field is used to calculate the total average value of the coupled optical fiber electric field analytical solution by using the fiber parameters through the coupled mode equation;
  • the coupled power equation rewriting module is used to rewrite the total average value of the coupled optical fiber electric field analytical solution to obtain a coupled power equation that includes nonlinear effects;
  • a coupling power calculation module configured to calculate the coupling power of the coupled fiber by using the coupling power equation including nonlinear effects
  • the multi-core fiber crosstalk calculation module is used to calculate the multi-core fiber crosstalk estimation including nonlinear influence by using the transmitting power and the coupling power of the coupling fiber.
  • the present invention also provides a multi-core optical fiber crosstalk detection device, including:
  • the processor is configured to implement the steps of a multi-core optical fiber crosstalk detection method according to any one of claims 1 to 7 when executing the computer program.
  • the present invention also provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium.
  • the multi-core optical fiber crosstalk detection method of the present invention includes: introducing the Kerr nonlinear effect to redefine the linear coupled mode equation, obtaining the coupled mode equation including the nonlinear effect, and calculating the electric field of the coupled optical fiber through the coupled mode equation by using the fiber parameters
  • the total average value of the analytical solution is rewritten to obtain the coupling power equation including the nonlinear influence by rewriting the total average value of the analytical solution of the coupled optical fiber electric field;
  • the coupling mode equation of influence has obtained the coupling power equation that comprises nonlinear influence; Utilizes the coupling power equation that comprises nonlinear influence to calculate coupling fiber coupling power, utilizes launch power and described coupling fiber coupling power to calculate the multiple that comprises nonlinear influence Core Fiber Crosstalk Estimation.
  • the present invention obtains a brand-new crosstalk estimation including nonlinear influence on the basis of nonlinear influence, which is more suitable for actual fiber laying conditions and has a wider application range than the crosstalk estimation without nonlinear influence. It is equally applicable in the linear field and the nonlinear field. On this basis, the characteristics of crosstalk in different communication systems can be studied, and the theoretical method for reducing inter-core crosstalk can be studied according to the relationship between crosstalk and optical fiber parameters.
  • Fig. 1 is the realization flowchart of multi-core crosstalk calculation provided by the present invention
  • Fig. 2 is the block diagram of simulation calculation
  • Figure 3 is a schematic diagram of bending and twisting of a seven-core optical fiber
  • Figure 4 is a 7-core optical fiber crosstalk measurement experimental device
  • Figure 5 is a graph showing the variation of nonlinear crosstalk with power
  • Figure 6 is a graph showing the variation of linear and nonlinear crosstalk with bending radius at different refractive indices
  • Figure 7 is a graph showing linear and nonlinear crosstalk as a function of core spacing
  • Figure 8 is a graph showing linear and nonlinear crosstalk as a function of optical wavelength
  • FIG. 9 is a structural block diagram of a multi-core optical fiber crosstalk detection device provided by an embodiment of the present invention.
  • the core of the present invention is to provide a method, device, equipment and computer storage medium for multi-core crosstalk calculation. Based on the nonlinear influence, a brand-new crosstalk estimation including nonlinear influence is obtained. The crosstalk estimation influenced by the crosstalk effect is more suitable for the actual fiber laying situation.
  • Fig. 1 is the realization flowchart of multi-core crosstalk calculation provided by the present invention. The specific operation steps are as follows:
  • j is the imaginary number unit
  • a m (z) and A n (z) are the slow-varying complex amplitudes of the electric field of the coupling fiber m and the incident fiber n, respectively
  • ⁇ m is the self-coupling coefficient for nonlinear effects
  • N is the core Quantity
  • C mn is the mode coupling coefficient from the incident fiber n to the coupling fiber m
  • ⁇ f(z) is a phase function describing fiber bending and twist
  • ⁇ ′ m (z) and ⁇ ′ n (z) are respectively the equivalent propagation constants of the coupling fiber m and the incident fiber n
  • ⁇ ′ m ( z) can be expressed as:
  • ⁇ c is the undisturbed core propagation constant
  • ⁇ c n eff 2 ⁇ / ⁇
  • n eff the effective refractive index of the fundamental mode
  • ⁇ is the wavelength of the light wave
  • ⁇ n (z) is the core n at a transmission distance of The phase at z
  • r is the torsion rate.
  • phase function ⁇ f(z) is a stationary random variable
  • u is the autocorrelation function variable
  • S104 Calculate the coupling power of the coupling fiber by using the coupling power equation including nonlinear effects
  • the incident power is injected from the N core, not from the M core, and the first-order approximate solution of formula (6) is obtained, that is, the coupling power of the coupling fiber is:
  • S105 Calculate the multi-core optical fiber crosstalk value including the nonlinear effect by using the transmitting power and the coupling power of the coupling optical fiber.
  • ⁇ n is the self-coupling coefficient of the nonlinear influence
  • PL is the transmission power
  • z is the transmission length of the wave amplitude
  • the multi-core optical fiber crosstalk detection method of the present invention includes: introducing the Kerr nonlinear effect to redefine the linear coupled mode equation, obtaining the coupled mode equation including the nonlinear effect, and calculating the electric field of the coupled optical fiber through the coupled mode equation by using the fiber parameters
  • the total average value of the analytical solution is rewritten to obtain the coupling power equation including the nonlinear influence by rewriting the total average value of the analytical solution of the coupled optical fiber electric field;
  • the coupling mode equation of influence has obtained the coupling power equation that comprises nonlinear influence; Utilizes the coupling power equation that comprises nonlinear influence to calculate coupling fiber coupling power, utilizes launch power and described coupling fiber coupling power to calculate the multiple that comprises nonlinear influence Core Fiber Crosstalk Estimation.
  • the present invention obtains a brand-new crosstalk estimation including nonlinear influence on the basis of nonlinear influence, which is more suitable for actual fiber laying conditions and has a wider application range than the crosstalk estimation without nonlinear influence. It is equally applicable in the linear field and the nonlinear field. On this basis, the characteristics of crosstalk in different communication systems can be studied, and the theoretical method for reducing inter-core crosstalk can be studied according to the relationship between crosstalk and optical fiber parameters.
  • Figure 2 is a simulation calculation block diagram, based on the above embodiments, this embodiment simulates and verifies the theoretical model for different transmission systems, compares the simulation results with the experimental results, and verifies the correctness and reliability of the theory
  • the scope of application is as follows:
  • Figure 4 is a diagram of the experimental device
  • Figure 5 shows the variation of NICXT along the incident power according to formula (7).
  • the theoretical model is in good agreement with the experimental data.
  • the incident power increases, there is a critical power. Before the critical power, the nonlinearity has no or little influence on the incident power; after the critical power, the nonlinearity has a greater influence on the incident power.
  • the Kerr effect reduces the phase constant of the core mode, so that the uniform 7CF becomes non-uniform 7CF.
  • the number of phase matching points for crosstalk decreases in the nonlinear range, and the crosstalk decreases from -31dBm to -35dBm.
  • Fig. 6 is a graph showing the crosstalk variation with bending radius of the discrete variation model (DCM), the linear crosstalk model and the nonlinear crosstalk model based on formula (7), and the incident power is 20dbm.
  • the bend radius affects the equivalent propagation constant and thus the linear crosstalk in Equation (7). Simulations were performed in real homogeneous and inhomogeneous 7CFs with intrinsic effective refractive index differences ⁇ n eff of 0.012% and 0.046%.
  • the bending radius is large, the suppression effect of NICXT is consistent with the experimental results shown in Fig. 5, no matter whether the actual fiber is uniform or not.
  • the inhibitory effect of NICXT is relatively weak near the critical bending radius.
  • Figures 7 and 8 show DCM, linear crosstalk and nonlinear crosstalk as a function of core spacing and optical wavelength at different incident powers, respectively.
  • the crosstalk decreases as the core spacing increases.
  • the incident power is 20dbm
  • the magnitude of the decrease of nonlinear crosstalk with the increase of magnetic core spacing is greater than that of linear crosstalk.
  • both linear and nonlinear crosstalk increase with optical wavelength.
  • the nonlinear crosstalk with an incident power of 20dbm is smaller than the linear crosstalk without nonlinearity, which is consistent with our nonlinear crosstalk suppression theory.
  • the present invention can provide a fast and accurate crosstalk estimation calculation method for the actual multi-core optical fiber communication system, and its application range is wider.
  • the model is not only applicable to the phase matching area, but also applicable to the non-phase matching area.
  • This model takes into account the nonlinear effects of fiber transmission that were not considered in previous models, and also considers the disturbance of bending and torsion in actual fiber laying scenarios, so this model is more suitable for crosstalk estimation of actual fibers. Based on this model, we can more It is good to study the characteristics of crosstalk in multicore fiber.
  • FIG. 9 is a structural block diagram of a multi-core optical fiber crosstalk detection device provided by an embodiment of the present invention.
  • the specific device may include:
  • the nonlinear introduction module 100 introduces the Kerr nonlinear effect to redefine the linear coupled mode equation, and obtains the coupled mode equation including nonlinear effects:
  • j is the imaginary number unit
  • a m (z) and A n (z) are the slow-varying complex amplitudes of the electric field of the coupling fiber m and the incident fiber n, respectively
  • ⁇ m is the self-coupling coefficient for nonlinear effects
  • N is the core Quantity
  • C mn is the mode coupling coefficient from the incident fiber n to the coupling fiber m
  • ⁇ f(z) is a phase function describing fiber bending and twist
  • the total average value calculation module 200 of the electric field calculates the total average value of the coupled optical fiber electric field analytical solution by using the fiber parameters through the coupled mode equation;
  • the coupling power equation rewriting module 300 rewrites the total average value of the analytical solution of the coupled optical fiber electric field to obtain a coupling power equation including nonlinear effects
  • the coupling power calculation module 400 is used to calculate the coupling power of the coupling fiber by using the coupling power equation including nonlinear effects;
  • the multi-core fiber crosstalk calculation module 500 calculates the multi-core fiber crosstalk value including nonlinear effects by using the transmit power and the coupling power of the coupling fiber.
  • the multi-core optical fiber crosstalk detection device of this embodiment is used to implement the aforementioned multi-core optical fiber crosstalk detection method, so the specific implementation of the multi-core optical fiber crosstalk detection device can be seen in the embodiment part of the multi-core optical fiber crosstalk detection method above, for example,
  • the linear introduction module 100, the electric field total average value calculation module 200, the coupling power equation rewriting module 300, the coupling power calculation module 400 and the multi-core optical fiber crosstalk calculation module 500 are respectively used to implement steps S101 and S102 in the above multi-core optical fiber crosstalk detection method, S103, S104, and S105. Therefore, for their specific implementation manners, reference may be made to the descriptions of the corresponding partial embodiments, and details are not repeated here.
  • the specific embodiment of the present invention also provides a multi-core optical fiber crosstalk detection device, including: a memory for storing computer programs;
  • the processor is configured to implement the steps of the above-mentioned method for multi-core optical fiber crosstalk detection when executing the computer program.
  • a specific embodiment of the present invention also provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the above-mentioned multi-core optical fiber crosstalk detection method is implemented. step.
  • the embodiments of the present application may be provided as methods, systems, or computer program products. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.
  • computer-usable storage media including but not limited to disk storage, CD-ROM, optical storage, etc.
  • These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to operate in a specific manner, such that the instructions stored in the computer-readable memory produce an article of manufacture comprising instruction means, the instructions
  • the device realizes the function specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

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Abstract

L'invention concerne un procédé, un dispositif et un appareil de détection de diaphonie de fibre optique multicœur, et un support de stockage informatique. Le procédé de détection de diaphonie de fibre optique multicœur consiste à : introduire un effet non linéaire de Kerr pour redéfinir une équation de mode couplé linéaire, de façon à obtenir une équation de mode couplé comprenant une influence non linéaire (S101) ; calculer la valeur moyenne totale de solutions analytiques de champ électrique d'une fibre optique couplée à l'aide de paramètres de fibre optique et au moyen de l'équation de mode couplé (S102) ; réécrire la valeur moyenne totale des solutions analytiques de champ électrique de la fibre optique couplée, de façon à obtenir une équation de puissance couplée comprenant l'influence non linéaire (S103) ; calculer une puissance couplée de la fibre optique couplée au moyen de l'équation de puissance couplée comprenant l'influence non linéaire (S104) ; et calculer, à l'aide d'une puissance de transmission, et de la puissance couplée de la fibre optique couplée, une valeur de diaphonie de fibre optique multicœur comprenant l'influence non linéaire (S105). Au moyen du procédé, une équation de puissance couplée, à laquelle est ajoutée une influence non linéaire, est à nouveau dérivée, et sur cette base, une nouvelle estimation de diaphonie non linéaire est obtenue, et l'estimation de diaphonie non linéaire est plus appropriée pour une situation de pose de fibre optique réelle.
PCT/CN2022/078322 2021-12-27 2022-02-28 Procédé et appareil de détection de diaphonie de fibre optique multicœur, et support de stockage WO2023123651A1 (fr)

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