Microwave photon link simulation system and use method thereof

Abstract

The invention provides a microwave photon link simulation system and a use method thereof, the system comprises an acquisition module, an index determination module and an association module, the acquisition module receives operation parameters of each device in a link input by a user and a to-be-simulated link index; the operating parameters are input into the optical link transmission model through the index determination module to calculate the simulation result of the to-be-simulated link index, the simulation result and the corresponding operating parameters are subjected to data association through the association module, the change relation between the to-be-simulated link index and the related operating parameters is obtained, and the change relation can be visually displayed to a user. According to the system provided by the invention, after a user inputs the operating parameters of each device, the system realizes quick externally-modulated microwave photonic link modeling simulation, and displays the change relationship between the performance indexes and the operating parameters of the microwave optical transceiving link to the user.

Description

Technical Field

[0001] The present invention relates to the field of microwave photon technology, and in particular to a microwave photon link simulation system and a use method thereof. Background Art

[0002] The microwave photonic system mainly plays a role in the RF front-end part between the antenna and the digital signal processing functional unit, and is used to replace the transmission, distribution, and processing functions of traditional microwave signals. In practical applications, the microwave module and the microwave photonic module are combined to realize the system function. Therefore, when designing the system, it is necessary to first evaluate the performance indicators related to the microwave photonic transceiver link, so as to design the microwaves at the front and back ends of the microwave photonic system and realize the overall system function. The microwave optical transceiver link and the microwave photonic device have a complex parameter system, and there is a complex constraint relationship between the performance indicators of the microwave optical transceiver link and the parameters of the microwave photonic device. In the related technology, microwave photonic simulation systems such as VPI, optisystem and other simulation software are generally used. Although the link simulation of various device parameter definitions is realized, the link-related performance indicators cannot be intuitively calculated, and the relationship between the performance indicators of the microwave optical transceiver link and the parameters of the microwave photonic device cannot be characterized, and the calculation requirements of the system cannot be met.

[0003] Therefore, how to provide a microwave photonic link simulation system that can calculate performance indicators and intuitively display the changing relationship between parameters is a technical problem that urgently needs to be solved. Summary of the invention

[0004] In view of the above-mentioned shortcomings of the prior art, the present invention provides a technical solution of a microwave photonic link simulation system to solve at least one of the above-mentioned technical problems.

[0005] In order to achieve the above-mentioned purpose and other related purposes, the technical solution provided by this application is as follows.

[0006] According to a first aspect of an embodiment of the present application, a microwave photonic link simulation system is provided, comprising:

[0007] The acquisition module is used to receive the operating parameters of each device and the link indicators to be simulated input by the user;

[0008] An indicator determination module, used for inputting the operating parameters into an optical link transmission model to determine a simulation result of the link indicator to be simulated, wherein the optical link transmission model is used to characterize a mapping relationship between the operating parameters and the link indicator output by the microwave photonic link;

[0009] The association module is used to perform data association between the simulation results and corresponding operating parameters to obtain parameter change relationships and display the parameter change relationships to the user.

[0010] In one embodiment of the present application, the indicator determination module includes: a model building unit, which is used to establish the transfer relationship of each device according to the operating parameters, and determine the link indicator of the microwave photonic link according to multiple transfer relationships and the signal flow relationship between each of the devices to establish the optical link transmission model; a simulation module, which is used to input the transportation parameters corresponding to the link indicator to be simulated into the optical link transmission model for data simulation to obtain the simulation result.

[0011] In one embodiment of the present application, the microwave photonic link includes a modulator, and the model building unit includes: a link loss determination subunit, which is used to determine the link loss according to the DC photocurrent, input impedance, output impedance of the microwave photonic link and the bias point and RF half-wave voltage of the modulator; a noise factor determination subunit, which is used to determine the noise factor according to the link loss, output noise and transmission bandwidth of the microwave photonic link; a compression parameter determination subunit, which is used to determine the input 1dB compression point according to the RF half-wave voltage; an input cutoff determination subunit, which is used to determine the input third-order cutoff point according to the RF half-wave voltage and the input impedance; and a spurious-free dynamic range determination subunit, which is used to determine the spurious-free dynamic range according to the third-order cutoff point and the noise factor.

[0012] In one embodiment of the present application, the link loss determination expression is as follows:

[0013]

[0014] In the above expression, G RF is the link loss, I dc is the DC photocurrent of the microwave photonic link, Z in is the input impedance of the microwave photonic link, Z out is the output impedance of the microwave photonic link, θ B is the bias point of the modulator, V π is the RF half-wave voltage of the modulator.

[0015] In one embodiment of the present application, the noise coefficient determination expression is as follows:

[0016]

[0017] In the above expression, NF is the noise factor, G RF is the link loss, N out is the output noise, k is the Boltzmann constant, T=290K is the standard noise temperature, e is the charge, and B is the transmission bandwidth - usually normalized to 1 Hz.

[0018] In one embodiment of the present application, the input third-order intercept point expression is as follows:

[0019]

[0020] In the above expression, IIP3 is the input third-order intercept point, V π is the RF half-wave voltage of the modulator, Z in is the input impedance of the microwave photonic link.

[0021] In one embodiment of the present application, the input 1dB compression point determination expression is as follows:

[0022]

[0023] In the above expression, P RF，1dB is the input 1dB compression point, and Vπ is the RF half-wave voltage of the modulator.

[0024] In one embodiment of the present application, the spurious-free dynamic range expression is as follows:

[0025]

[0026] In the above expression, SFDR3 is the spurious-free dynamic range, IIP3 is the input third-order cutoff point, NF is the noise factor, k is the Boltzmann constant, and T=290K is the standard noise temperature.

[0027] According to a second aspect of an embodiment of the present application, there is provided a method for using the microwave photonic link simulation system as described above, comprising:

[0028] Obtaining the operating parameters of each of the devices and the link indicators to be simulated input by the user;

[0029] The link indicator to be simulated is simulated, and the simulation result is data-associated with relevant operating parameters to obtain the parameter change relationship for display to the user.

[0030] In one embodiment of the present application, the optical link transmission model construction step includes: constructing the transmission relationship corresponding to each device according to the operating parameters respectively; determining the link index of the microwave photonic link through a plurality of the transmission relationships and the signal flow relationship between each of the devices to establish the optical link transmission model.

[0031] The present application provides a microwave photonic link simulation system and its use method, the system includes an acquisition module, an index determination module and an association module, the acquisition module receives the operating parameters of each device in the link input by the user and the link index to be simulated, the index determination module inputs the operating parameters into the optical link transmission model to calculate the simulation result of the link index to be simulated, and the association module associates the simulation result with the corresponding operating parameters to obtain the change relationship between the link index to be simulated and the relevant operating parameters, which can be displayed to the user intuitively. In the system provided by the present application, after the user inputs the operating parameters of each device, the system realizes rapid external microwave photonic link modeling simulation, and displays the change relationship between the performance indicators of the microwave optical transceiver link and the operating parameters to the user.

[0032] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The drawings herein are incorporated into the specification and constitute a part of the specification, showing embodiments consistent with the present invention, and together with the specification, are used to explain the principles of the present invention. Obviously, the drawings described below are only some embodiments of the present invention, and for those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0034] Figure 1 is a block diagram of a microwave photonic link simulation system shown in an exemplary embodiment of the present invention;

[0035] Figure 2 is a schematic diagram of device connection in a microwave photonic link shown in an exemplary embodiment of the present invention;

[0036] Figure 3 is a flow chart of a method for using a microwave photonic link simulation system shown in an exemplary embodiment of the present invention;

[0037] Figure 4 is a schematic diagram of the operation of a microwave photonic link simulation system shown in an exemplary embodiment of the present invention;

[0038] Figure 5 It is a schematic diagram of an interactive page shown in an exemplary embodiment of the present invention. DETAILED DESCRIPTION

[0039] The following will describe the embodiments of the present invention with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for illustrating the present invention, not for limiting the scope of protection of the present invention.

[0040] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and thus the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0041] In the following description, numerous details are discussed to provide a more thorough explanation of the embodiments of the present invention. However, it is obvious to those skilled in the art that the embodiments of the present invention can be implemented without these specific details. In other embodiments, well-known structures and devices are shown in the form of block diagrams rather than in detail to avoid making the embodiments of the present invention difficult to understand.

[0042] The input 1dB compression point is defined as the input signal level that causes the gain to drop by 1dB.

[0043] The full name of VPI software is VPI TransmissionMaker, which is used to build and simulate optical communication systems, fiber-optic communication systems, and other systems, as well as perform performance analysis.

[0044] OptiSystem is an innovative optical communication system simulation software that helps users design, test and simulate the physical layer in wide spectrum optical networks from video broadcast systems to intercontinental backbone networks.

[0045] Matlab is a combination of the two words matrix & laboratory, which means matrix factory (matrix laboratory). The software is mainly used for high-tech computing environment for scientific computing, visualization and interactive programming. It integrates many powerful functions such as numerical analysis, matrix calculation, scientific data visualization, and modeling and simulation of nonlinear dynamic systems in an easy-to-use window environment, providing a comprehensive solution for scientific research, engineering design and many scientific fields that require effective numerical calculations.

[0046] The microwave photonic system mainly plays a role in the RF front-end part between the antenna and the digital signal processing functional unit, and is used to replace the transmission, distribution, and processing functions of traditional microwave signals. In practical applications, the microwave module and the microwave photonic module are combined to realize the system function. Therefore, when designing the system, it is necessary to first evaluate the performance indicators related to the microwave photonic transceiver link, so as to design the microwaves at the front and back ends of the microwave photonic system and realize the overall system function. The microwave optical transceiver link and the microwave photonic device have a complex parameter system, and there is a complex constraint relationship between the performance indicators of the microwave optical transceiver link and the parameters of the microwave photonic device. In the related technology, microwave photonic simulation systems such as VPI, optisystem and other simulation software are generally used. Although the link simulation of various device parameter definitions is realized, the link-related performance indicators cannot be intuitively calculated, and the relationship between the performance indicators of the microwave optical transceiver link and the parameters of the microwave photonic device cannot be characterized, and the calculation requirements of the system cannot be met.

[0047] To solve the above problems, Figure 1 As shown, the present application provides a microwave photonic link simulation system, comprising:

[0048] The acquisition module is used to receive the operating parameters of each device and the link indicators to be simulated input by the user;

[0049] An indicator determination module, used to input the operating parameters into the optical link transmission model to determine the simulation result of the link indicator to be simulated, and the optical link transmission model is used to characterize the mapping relationship between the operating parameters and the link indicator output by the microwave photonic link;

[0050] The association module is used to perform data association between the simulation results and the corresponding operating parameters, obtain the parameter change relationship, and display the parameter change relationship to the user.

[0051] It should be noted that the microwave photonic link simulation system provided in the present application simulates the performance indicators in the microwave photonic link, and the microwave photonic link may be an external intensity modulated transmission link; Figure 2 As shown, the external intensity modulation transmission link includes: a laser, a modulator, a transmission optical network and a photoelectric detector. The modulator receives a radio frequency signal and the photoelectric detector outputs a radio frequency signal.

[0052] In addition, the operating parameters of each device in the microwave photonic link include: the output optical power of the laser (P in ) and relative intensity noise (RIN), the insertion loss of the modulator (L MZM ), bias point (θ B ) and RF half-wave voltage (V π ), the responsivity of the detector (r), the optical path loss of the transmission link (L), etc.

[0053] The link performance indicators that need to be simulated by the simulation system include link loss, noise figure, spurious-free dynamic range, input 1dB compression point and input third-order intercept point.

[0054] In detail, the indicator determination module includes: a model building unit, which is used to establish the transfer relationship of each device according to the operating parameters, and determine the link indicator of the microwave photonic link according to multiple transfer relationships and the signal flow relationship between each device, so as to establish an optical link transmission model; a simulation module, which is used to input the transportation parameters corresponding to the link indicators to be simulated into the optical link transmission model for data simulation to obtain simulation results.

[0055] In more detail, the model building unit includes: a link loss determination subunit, which is used to determine the link loss according to the DC photocurrent, input impedance, output impedance and bias point of the modulator and the RF half-wave voltage of the microwave photonic link; a noise factor determination subunit, which is used to determine the noise factor according to the link loss, output noise and transmission bandwidth of the microwave photonic link; a compression parameter determination subunit, which is used to determine the input 1dB compression point according to the RF half-wave voltage; an input cutoff determination subunit, which is used to determine the input third-order cutoff point according to the RF half-wave voltage and the input impedance; and a spurious-free dynamic range determination subunit, which is used to determine the spurious-free dynamic range according to the third-order cutoff point and the noise factor.

[0056] In more detail, the link loss is determined as shown in expression (1):

[0057]

[0058] In expression (1), G RF is the link loss, I dc is the DC photocurrent of the microwave photonic link, Z in is the input impedance of the microwave photonic link, Z out is the output impedance of the microwave photonic link, θ B is the bias point of the modulator, V π is the RF half-wave voltage of the modulator.

[0059] It should be noted that the DC photocurrent of the microwave photon link is determined by the responsivity of the detector, the insertion loss of the modulator, the optical path loss of the transmission link and the output optical power of the laser. dc The calculation expression is: dc =r*L MZM *L*P in / 2.

[0060] In more detail, the noise factor determination expression is shown in (2):

[0061]

[0062] In expression (2), NF is the noise factor, G RF is the link loss, N out is the output noise, k is the Boltzmann constant, T=290K is the standard noise temperature, e is the charge, and B is the transmission bandwidth - usually normalized to 1 Hz.

[0063] In more detail, the input third-order cutoff point expression is shown in (3):

[0064]

[0065] In expression (3), IIP3 is the input third-order intercept point, V π is the RF half-wave voltage of the modulator, Z in is the input impedance of the microwave photonic link.

[0066] In more detail, the input 1dB compression point determination expression is shown in (4):

[0067]

[0068] In expression (4), P RF，1dB is the input 1dB compression point, and Vπ is the RF half-wave voltage of the modulator.

[0069] Among them, the input 1dB compression point is the input 1dB compression point.

[0070] In more detail, the spurious-free dynamic range expression is shown in (5):

[0071]

[0072] In expression (5), SFDR3 is the spurious-free dynamic range, IIP3 is the input third-order intercept point, NF is the noise factor, k is the Boltzmann constant, and T=290K is the standard noise temperature.

[0073] like Figure 3 As shown, the present application also provides a method for using a microwave photonic link simulation system, comprising:

[0074] Obtain the operating parameters of each device and the link indicators to be simulated input by the user;

[0075] The link indicators to be simulated are simulated, and the simulation results are data-associated with relevant operating parameters to obtain parameter change relationships for display to the user.

[0076] Indicatively, Figure 4 As shown in , the user inputs the operating parameters of each device in the microwave photonic link through the interactive page and sets the indicators of the link to be simulated that need to be solved; Figure 5As shown in the figure, the device operating parameters input by the user on the interactive page include: the relative intensity noise (RIN) of the laser is -160dB / Hz, the output optical power of the laser is 17dBm; the bias point of the modulator is 90° (orthogonal point), the insertion loss of the modulator is 4dB, and the RF half-wave voltage of the modulator is 5V; the responsivity of the detector is 0.8A / W; the optical path loss of the transmission link is 10dB; the link indicator to be simulated is set to link loss (Gain), the simulation system background extracts the operating parameters input by the user, inputs the values ​​of the operating parameters of each device into the optical link transmission model, runs the optical link transmission model through the simulation software, the simulation software can be Matlab, obtains the simulation results of the link indicator to be simulated, displays the output results of the simulation in the interactive interface, associates the operating parameters with the simulation results of the link indicator to be simulated, and obtains the parameter change relationship, such as Figure 5 As shown, the modulator bias point (θ B ) is set as the X-axis parameter, and the link loss (Gain) is set as the Y-axis parameter. The obtained parameter change relationship is as follows Figure 5 shown.

[0077] In detail, the steps of constructing the optical link transmission model include: constructing the transfer relationship corresponding to each device according to the operating parameters respectively; determining the link index of the microwave photon link through multiple transfer relationships and the signal flow relationship between each device to establish the optical link transmission model. Specifically, the transfer function of each device is established according to the operating parameters of each device, and each transfer function is associated with the signal flow relationship between each device to obtain the link index, thereby constructing the optical link transmission model.

[0078] The present application provides a microwave photonic link simulation system and its use method, the system includes an acquisition module, an index determination module and an association module, the acquisition module receives the operating parameters of each device in the link input by the user and the link index to be simulated, the index determination module inputs the operating parameters into the optical link transmission model to calculate the simulation result of the link index to be simulated, and the association module associates the simulation result with the corresponding operating parameters to obtain the change relationship between the link index to be simulated and the relevant operating parameters, which can be displayed to the user intuitively. In the system provided by the present application, after the user inputs the operating parameters of each device, the system realizes rapid external microwave photonic link modeling simulation, and displays the change relationship between the performance indicators of the microwave optical transceiver link and the operating parameters to the user.

[0079] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by a person of ordinary skill in the art without departing from the spirit and technical ideas disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A microwave photonic link simulation system, characterized in that: include: The acquisition module is used to receive the operating parameters of each device and the link indicators to be simulated input by the user; An indicator determination module, used for inputting the operating parameters into an optical link transmission model to determine a simulation result of the link indicator to be simulated, wherein the optical link transmission model is used to characterize a mapping relationship between the operating parameters and the link indicator output by the microwave photonic link; The association module is used to perform data association between the simulation results and corresponding operating parameters to obtain parameter change relationships and display the parameter change relationships to the user.

2. The microwave photonic link simulation system according to claim 1, characterized in that: The indicator determination module comprises: A model building unit, used to establish a transfer relationship of each device according to the operating parameters, and determine a link index of the microwave photonic link according to a plurality of transfer relationships and a signal flow relationship between the devices, so as to establish the optical link transmission model; The simulation module is used to input the transport parameters corresponding to the link indicators to be simulated into the optical link transmission model to perform data simulation and obtain the simulation results.

3. The microwave photonic link simulation system according to claim 2, characterized in that: The microwave photonic link comprises a modulator, and the model building unit comprises: A link loss determination subunit, used to determine the link loss according to the DC photocurrent, input impedance, output impedance of the microwave photon link and the bias point and radio frequency half-wave voltage of the modulator; A noise factor determination subunit, used to determine the noise factor according to the link loss, output noise, and transmission bandwidth of the microwave photonic link; A compression parameter determination subunit, used to determine an input 1dB compression point according to the radio frequency half-wave voltage; An input cutoff determination subunit, used to determine an input third-order cutoff point according to the radio frequency half-wave voltage and the input impedance; The spurious free dynamic range determination subunit is used to determine the spurious free dynamic range according to the third-order cutoff point and the noise coefficient.

4. The microwave photonic link simulation system according to claim 3, characterized in that: The link loss determination expression is as follows: In the above expression, G RF is the link loss, I dc is the DC photocurrent of the microwave photonic link, Z in is the input impedance of the microwave photonic link, Z out is the output impedance of the microwave photonic link, θ B is the bias point of the modulator, V π is the RF half-wave voltage of the modulator.

5. The microwave photonic link simulation system according to claim 4, characterized in that: The noise factor determination expression is as follows: In the above expression, NF is the noise factor, G RF is the link loss, N out is the output noise, k is the Boltzmann constant, T=290K is the standard noise temperature, e is the charge, and B is the transmission bandwidth - usually normalized to 1 Hz.

6. The microwave photonic link simulation system according to claim 4, characterized in that: The input third-order cutoff point expression is as follows: In the above expression, IIP3 is the input third-order intercept point, V π is the RF half-wave voltage of the modulator, Z in is the input impedance of the microwave photonic link.

7. The microwave photonic link simulation system according to claim 4, characterized in that: The input 1dB compression point determination expression is as follows: P RF，1dB =-0.4+20*lg(V π ) In the above expression, P RF，1dB is the input 1dB compression point, and Vπ is the RF half-wave voltage of the modulator.

8. The microwave photonic link simulation system according to claim 6, characterized in that: The spurious-free dynamic range expression is as follows: In the above expression, SFDR3 is the spurious-free dynamic range, IIP3 is the input third-order cutoff point, NF is the noise factor, k is the Boltzmann constant, and T=290K is the standard noise temperature.

9. A method for using the microwave photonic link simulation system according to any one of claims 1 to 8, characterized in that: include: Obtaining the operating parameters of each device and the link index to be simulated input by the user; The link indicator to be simulated is simulated, and the simulation result is data-associated with relevant operating parameters to obtain the parameter change relationship for display to the user.

10. The method for using the microwave photonic link simulation system according to claim 9, characterized in that: The optical link transmission model construction step comprises: Constructing a transfer relationship corresponding to each device according to the operating parameters respectively; The link index of the microwave photonic link is determined by a plurality of the transfer relationships and the signal flow relationship between the devices, so as to establish the optical link transmission model.

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