CN112597735A - Simulation method, device and system of electro-absorption modulator and computer storage medium - Google Patents
Simulation method, device and system of electro-absorption modulator and computer storage medium Download PDFInfo
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- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/30—Circuit design
- G06F30/39—Circuit design at the physical level
- G06F30/392—Floor-planning or layout, e.g. partitioning or placement
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/30—Circuit design
- G06F30/39—Circuit design at the physical level
- G06F30/394—Routing
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/30—Circuit design
- G06F30/39—Circuit design at the physical level
- G06F30/398—Design verification or optimisation, e.g. using design rule check [DRC], layout versus schematics [LVS] or finite element methods [FEM]
Abstract
The invention discloses a simulation method, a device and a system of an electroabsorption modulator and a computer storage medium, wherein the method comprises the following steps: fitting a small-signal equivalent circuit model of the electroabsorption modulator through preset simulation software; testing a P-V characteristic curve of the electro-absorption modulator according to a preset bias current, and obtaining a nonlinear behavior function of the electro-absorption modulator according to the P-V characteristic curve; and simulating the electroabsorption modulator according to the small-signal equivalent circuit model and the nonlinear behavior function to obtain simulation data corresponding to the electroabsorption modulator and the package thereof. When the electro-absorption modulator is simulated, the non-linear behavior of the electro-absorption modulator is considered, and the electro-absorption modulator and the high-frequency performance of the electro-absorption modulator after being packaged can be evaluated more accurately and comprehensively.
Description
Technical Field
The present invention relates to the field of optical communication technologies, and in particular, to a method, an apparatus, a system, and a computer storage medium for simulating an electro-absorption modulator.
Background
In recent years, with the development of high-speed long-distance communication technology, Electro-Absorption modulators (EAMs) have been widely used. However, in the design of the electro-absorption modulator package, strict high-frequency simulation of the electro-absorption modulator is required.
The conventional high-frequency simulation methods analyze the linear behavior of the electro-absorption modulator and the package thereof, but the electro-absorption modulator works under the condition of large-signal excitation and inevitably generates the nonlinear behavior, so that the high-frequency performance of the electro-absorption modulator and the package thereof cannot be accurately evaluated by the conventional high-frequency simulation methods.
Disclosure of Invention
The invention mainly aims to provide a simulation method, a device, a system and a computer storage medium of an electro-absorption modulator, aiming at more accurately and comprehensively evaluating the electro-absorption modulator and the high-frequency performance of the electro-absorption modulator after being packaged.
To achieve the above object, the present invention provides a simulation method of an electro-absorption modulator, the method comprising the steps of:
fitting a small-signal equivalent circuit model of the electroabsorption modulator through preset simulation software;
testing a P-V characteristic curve of the electro-absorption modulator according to a preset bias current, and obtaining a nonlinear behavior function of the electro-absorption modulator according to the P-V characteristic curve;
and simulating the electroabsorption modulator and the package thereof according to the small signal equivalent circuit model and the nonlinear behavior function to obtain simulation data corresponding to the electroabsorption modulator and the package thereof.
Preferably, the step of fitting the small-signal equivalent circuit model of the electro-absorption modulator by using preset simulation software includes:
testing a photoelectric S parameter of the electroabsorption modulator;
and fitting a small-signal equivalent circuit model of the electroabsorption modulator based on the preset simulation software and the photoelectric S parameter.
Preferably, the step of fitting a small-signal equivalent circuit model of the electroabsorption modulator based on the preset simulation software and the optoelectronic S parameter includes:
building a general equivalent circuit model of the electroabsorption modulator through the preset simulation software;
and fitting the general equivalent circuit model based on the preset simulation software and the photoelectric S parameter so as to fit a small-signal equivalent circuit model of the electroabsorption modulator.
Preferably, the step of testing the P-V characteristic of the electro-absorption modulator according to a preset bias current comprises:
and testing the electro-absorption modulator based on at least three preset bias currents to obtain a P-V characteristic curve of the electro-absorption modulator.
Preferably, the step of simulating the electro-absorption modulator and the package thereof according to the small-signal equivalent circuit model and the nonlinear behavior function to obtain simulation data corresponding to the electro-absorption modulator and the package thereof includes:
extracting a packaging S parameter of the electroabsorption modulator, and building a simulation circuit diagram of the electroabsorption modulator based on the preset simulation software;
and simulating the electro-absorption modulator and the package thereof according to the package S parameter, the small signal equivalent circuit model, the nonlinear behavior function and the simulation circuit diagram to obtain simulation data corresponding to the electro-absorption modulator and the package thereof.
Preferably, after the step of obtaining the simulation data corresponding to the electroabsorption modulator and the package thereof, the method further includes:
performing performance evaluation on the electroabsorption modulator according to the simulation data to obtain a corresponding evaluation result;
and determining an optimization strategy of the electroabsorption modulator according to the evaluation result so as to optimally design the electroabsorption modulator according to the optimization strategy.
In addition, to achieve the above object, the present invention provides an emulation apparatus for an electro-absorption modulator, including:
the first fitting module is used for fitting a small-signal equivalent circuit model of the electro-absorption modulator through preset simulation software;
the second fitting module is used for testing a P-V characteristic curve of the electro-absorption modulator according to a preset bias current and obtaining a nonlinear behavior function of the electro-absorption modulator according to the P-V characteristic curve;
and the joint simulation module is used for simulating the electroabsorption modulator and the package thereof according to the small-signal equivalent circuit model and the nonlinear behavior function to obtain simulation data corresponding to the electroabsorption modulator and the package thereof.
Preferably, the first fitting module is further configured to:
testing a photoelectric S parameter of the electroabsorption modulator;
and fitting a small-signal equivalent circuit model of the electroabsorption modulator based on the preset simulation software and the photoelectric S parameter.
Preferably, the first fitting module is further configured to:
building a general equivalent circuit model of the electroabsorption modulator through preset simulation software;
and fitting the general equivalent circuit model based on the preset simulation software and the photoelectric S parameter so as to fit a small-signal equivalent circuit model of the electroabsorption modulator.
Preferably, the second fitting module is further configured to:
and testing the electro-absorption modulator based on at least three preset bias currents to obtain a P-V characteristic curve of the electro-absorption modulator.
Preferably, the joint simulation module is further configured to:
extracting a packaging S parameter of the electroabsorption modulator, and building a simulation circuit diagram of the electroabsorption modulator based on the preset simulation software;
and simulating the electro-absorption modulator and the package thereof according to the package S parameter, the small signal equivalent circuit model, the nonlinear behavior function and the simulation circuit diagram to obtain simulation data corresponding to the electro-absorption modulator and the package thereof.
Preferably, the simulation apparatus of the electro-absorption modulator further comprises an evaluation optimization module, the evaluation optimization module is configured to:
performing performance evaluation on the electroabsorption modulator according to the simulation data to obtain a corresponding evaluation result;
and determining an optimization strategy of the electroabsorption modulator according to the evaluation result so as to optimally design the electroabsorption modulator according to the optimization strategy.
In addition, to achieve the above object, the present invention also provides a simulation system of an electro-absorption modulator, including: a memory, a processor and a simulation program of the electro absorption modulator stored on the memory and executable on the processor, the simulation program of the electro absorption modulator implementing the steps of the simulation method of the electro absorption modulator as described above when executed by the processor.
Further, to achieve the above object, the present invention also provides a computer storage medium having stored thereon a simulation program of an electro absorption modulator, which when executed by a processor, implements the steps of the simulation method of the electro absorption modulator as described above.
The simulation method of the electro-absorption modulator provided by the invention is characterized in that a small-signal equivalent circuit model of the electro-absorption modulator is fitted through preset simulation software; testing a P-V characteristic curve of the electro-absorption modulator according to a preset bias current, and obtaining a nonlinear behavior function of the electro-absorption modulator according to the P-V characteristic curve; and simulating the electroabsorption modulator according to the small-signal equivalent circuit model and the nonlinear behavior function to obtain simulation data corresponding to the electroabsorption modulator. When the electro-absorption modulator is simulated, the non-linear behavior of the electro-absorption modulator is considered, and the electro-absorption modulator and the high-frequency performance of the electro-absorption modulator after being packaged can be evaluated more accurately and comprehensively.
Drawings
FIG. 1 is a system diagram of a hardware operating environment according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart of a simulation method of an electro-absorption modulator according to a first embodiment of the present invention;
FIG. 3 is a schematic diagram of a general equivalent circuit model of a preferred embodiment of a simulation method for an electro-absorption modulator according to the present invention;
FIG. 4 is a simulation circuit diagram of a preferred embodiment of a simulation method for an electro-absorption modulator according to the present invention;
FIG. 5 is a functional block diagram of a preferred embodiment of a simulation method for an electro-absorption modulator according to the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1, fig. 1 is a system structural diagram of a hardware operating environment according to an embodiment of the present invention.
The system of the embodiment of the invention can be a mobile terminal, a PC terminal and the like.
As shown in fig. 1, the system may include: a processor 1001, such as a CPU, a network interface 1004, a user interface 1003, a memory 1005, a communication bus 1002. Wherein a communication bus 1002 is used to enable connective communication between these components. The user interface 1003 may include a Display screen (Display), an input unit such as a Keyboard (Keyboard), and the optional user interface 1003 may also include a standard wired interface, a wireless interface. The network interface 1004 may optionally include a standard wired interface, a wireless interface (e.g., WI-FI interface). The memory 1005 may be a high-speed RAM memory or a non-volatile memory (e.g., a magnetic disk memory). The memory 1005 may alternatively be a storage device separate from the processor 1001.
Those skilled in the art will appreciate that the system architecture shown in FIG. 1 is not intended to be limiting of the system, and may include more or fewer components than those shown, or some components may be combined, or a different arrangement of components.
As shown in fig. 1, a memory 1005, which is a kind of computer storage medium, may include therein an operating system, a network communication module, a user interface module, and an emulation program of an electro-absorption modulator.
The operating system is a program for managing and controlling the simulation system and the software resources of the electroabsorption modulator, and supports the operation of the network communication module, the user interface module, the simulation program of the electroabsorption modulator and other programs or software; the network communication module is used for managing and controlling the network interface 1002; the user interface module is used to manage and control the user interface 1003.
In the simulation system of the electro-absorption modulator shown in fig. 1, the simulation system of the electro-absorption modulator calls a simulation program of the electro-absorption modulator stored in the memory 1005 by the processor 1001 and performs operations in the respective embodiments of the simulation method of the electro-absorption modulator described below.
Based on the hardware structure, the embodiment of the simulation method of the electro-absorption modulator is provided.
Referring to fig. 2, fig. 2 is a schematic flow chart of a first embodiment of a simulation method of an electro-absorption modulator according to the present invention, the method including:
step S10, fitting a small-signal equivalent circuit model of the electro-absorption modulator through preset simulation software;
the simulation method of the electro-absorption modulator is applied to the simulation system of the electro-absorption modulator in each large package simulation process. For convenience of description, the simulation system of the electro-absorption modulator is abbreviated as simulation system. An Electro-Absorption Modulator (EAM) is a device that modulates an optical signal by using a Franz-Keldysh effect (frank-Keldysh effect) and a quantum confinement Stark effect (Stark effect), and generally operates at an Absorption wavelength of the Modulator, wherein the Franz-Keldysh effect is an effect in which light Absorption of a semiconductor changes when an electric field is applied; the Stark effect refers to the phenomenon that atoms or molecules are split in energy level and spectrum under the action of an external electric field. Moreover, the electro-absorption modulator has the advantages of small overall dimension, low chirp effect, low driving voltage and the like, the modulation rate can reach 100Gbps (100 Gbits per second), and in addition, when the electro-absorption modulator and a DFB (Distributed Feedback Laser) are subjected to monolithic integration, the phenomena of spectrum broadening and frequency response relaxation oscillation caused by chirp under high-frequency modulation of the DFB Laser are solved; moreover, the coupling efficiency between the electroabsorption modulator and the laser is high, and high optical output power can be output; in addition, the electric absorption modulator and the distributed feedback laser diode can be integrated on a chip simultaneously, a data transmitter is obtained in a photonic integrated circuit mode, larger bandwidth can be obtained, the chip size is smaller, cost is reduced, packaging size is reduced, and the electric absorption modulator has wide application prospect.
Along with the development of high-speed long-distance communication systems, various packaging forms of the electro-absorption modulator are also presented. However, since the electro-absorption modulator belongs to a high-frequency device, problems of transmission line matching, reflection, high-frequency loss and the like must be considered in the packaging design process, and therefore, strict high-frequency simulation must be performed on the electro-absorption modulator while the electro-absorption modulator is packaged and designed. Since the electro-absorption modulator belongs to an electro-optical device, the electro-optical conversion characteristic of the electro-absorption modulator, especially the nonlinear behavior under large-signal excitation, must be considered when performing simulation.
The conventional high-frequency simulation methods evaluate the linear behavior of the electro-absorption modulator under a small signal, the small signal refers to a small-amplitude sine wave modulation signal loaded at two ends of the modulator, the linear behavior refers to that the output optical power of a laser changes along with the amplitude change of the modulation signal loaded at two ends of the modulator, the output optical power is a linear function of a driving current, but the electro-absorption modulator works under the condition of large-signal excitation, the large signal refers to a pulse signal loading large amplitude to the modulator, the output signal of the laser is an optical pulse signal, and the output optical pulse signal is deformed and further causes transmission error codes due to the nonlinearity of the high-frequency response characteristic of the modulator under the large-signal excitation, so that risk evaluation in some aspects may be lost through the conventional small-signal simulation methods, and the electro-absorption modulator cannot be comprehensively evaluated for risk, the high frequency package performance of the electro-absorption modulator cannot be accurately evaluated, resulting in package design failure.
In this embodiment, the preset simulation software is preferably a circuit simulation software, and the Tuning function of the circuit simulation software can be utilized to fit and obtain the small-signal equivalent circuit model of the electro-absorption modulator. Before the simulation test of the electro-absorption modulator begins, a transmission line test substrate required by the simulation test needs to be manufactured in advance, for example, the equivalent impedance of the input and output ends of the electro-absorption modulator is 50 ohms (50 ohms), then, a transmission line test substrate of 50 ohms needs to be manufactured in advance, the electro-absorption modulator and the transmission line test substrate are welded to complete the communication connection between the transmission line test substrate and the electro-absorption modulator, and therefore various physical elements for the simulation test are designed by using the transmission line substrate and a corresponding device model, and a small-signal equivalent circuit model of the electro-absorption modulator is fitted.
Further, step S10 includes:
step a1, testing the photoelectric S parameter of the electroabsorption modulator;
step a2, fitting a small-signal equivalent circuit model of the electroabsorption modulator based on preset simulation software and the photoelectric S parameter.
In this embodiment, the basic operation of the electro-absorption modulator is: when the DFB laser works in a constant power mode, a modulation signal is applied to the electric absorption modulator, so that the electric absorption modulator is like a switch, light passes through or is switched off, and high-speed modulation of the light emitted by the DFB laser is realized. When testing the photoelectric S parameter of the electroabsorption modulator, a photoelectric network analyzer is needed, and the photoelectric network analyzer can only identify an electric signal, so that an electric-to-optical device and a photoelectric-to-electric device are inevitably simultaneously used in the photoelectric S parameter test. Firstly, voltage signals needing to be modulated are added at two ends of an electroabsorption modulator to modulate the constant light power output by a laser, namely an electroconversion process; the modulated light enters a detector with high responsivity and high bandwidth after being transmitted by an optical fiber, and the detector converts an optical signal into photocurrent, namely a light-to-electricity process; the current signal can be identified by a photoelectric network analyzer, and then the output photocurrent is compared with the input modulation voltage signal to obtain reflection parameters and transmission parameters, namely photoelectric S parameters, of the electro-absorption modulator, wherein the reflection parameters indicate the impedance mismatching degree of the modulator, the smaller the reflection is, the better the impedance matching is, and otherwise, the larger the reflection is, the serious impedance mismatching is indicated; the transmission parameter represents the loss degree of the modulator energy, the smaller the transmission coefficient is, the smaller the energy loss is, the larger the bandwidth is, and if the transmission coefficient is large, the larger the capacity loss is, the smaller the bandwidth is, and then a small-signal equivalent circuit model of the electro-absorption modulator is fitted through preset simulation software according to the photoelectric S parameter of the electro-absorption modulator.
Further, step a2 further includes:
step a21, building a universal equivalent circuit model of the electroabsorption modulator through the preset simulation software;
step a22, fitting the general equivalent circuit model based on the preset simulation software and the photoelectric S parameter to fit a small signal equivalent circuit model of the electroabsorption modulator.
In this embodiment, a general equivalent circuit model of the electro-absorption modulator can be constructed as shown in fig. 3, where CpParasitic capacitance of pad for wire binding of electro-absorption modulator, LsTo electroabsorb the parasitic inductance, R, of the metal conductor of the modulatorsIs the series resistance of an electro-absorption modulator, CjAnd RjRespectively, the junction capacitance and the junction resistance when the electro-absorption modulator is reverse biased. It will be appreciated that in simulation analysis of an electro-absorption modulator, a circuit model is used to represent the device or the entire simulation system, and that complex physical devices can be characterized by relatively simple circuit models, so that well-known mathematical methods and circuit laws can be used to deal with problems in simulation of an electro-absorption modulator to save design time. After the general equivalent circuit model of the electroabsorption modulator is built, the small-signal equivalent circuit model of the electroabsorption modulator can be obtained only by presetting simulation software, such as circuit simulation software and the like, and simultaneously fitting the amplitude and phase characteristics of the electroabsorption modulator according to the photoelectric S parameters.
Step S20, testing a P-V characteristic curve of the electro-absorption modulator according to a preset bias current, and obtaining a nonlinear behavior function of the electro-absorption modulator according to the P-V characteristic curve;
in the present embodiment, the modulator itself has a nonlinear effect, and the "nonlinearity" in the communication terminology, i.e. nonlinear modulation, is the nonlinear modulation in the analog modulation system, and the nonlinear modulation is also called angle modulation, which means that the modulation signal controls the frequency or phase of the high-frequency carrier, and the amplitude of the carrier remains unchanged. The nonlinear behavior function of the electro absorption modulator needs to be preset with simulation environments such as bias current and large signal excitation required by simulation test, wherein the large signal excitation environment can be constructed through an amplifying circuit, and then the nonlinear behavior function of the electro absorption modulator under the condition of the preset bias current can be obtained by writing a Matlab applet for extraction. For example, the preset bias current may be a typical bias current, that is, a P-V characteristic curve of the electro-absorption modulator may be obtained by using a typical preset bias current, and then a nonlinear function of the electro-absorption modulator may be obtained by fitting the P-V characteristic curve by using a preset fitting algorithm, such as a least square method.
Further, the step of testing the P-V characteristic curve of the electro-absorption modulator according to the preset bias current comprises:
and b, testing the electro-absorption modulator based on at least three preset bias currents to obtain a P-V characteristic curve of the electro-absorption modulator.
In this embodiment, in order to ensure the accuracy of the Matlab applet to be written, at least three different bias currents may be preset, that is, the preset bias current may include at least three different bias currents. If the preset bias current is three different bias currents, testing P-V characteristic curves of the electro-absorption modulator under the three different bias currents, and correspondingly obtaining three P-V characteristic curves of the electro-absorption modulator, so that a non-linear behavior function of the electro-absorption modulator is fitted according to the non-linear behaviors of the electro-absorption modulator under different preset bias current conditions, and during fitting, the three P-V characteristic curves are fitted at the same time, so that the non-linear behavior function of the electro-absorption modulator is obtained. In addition, the nonlinear behavior function extracted by writing the Matlab applet can be used for subsequent simulation tests in the aspects of eye diagrams, electro-optical responsivity and the like.
And step S30, simulating the electroabsorption modulator and the package thereof according to the small-signal equivalent circuit model and the nonlinear behavior function to obtain simulation data corresponding to the electroabsorption modulator and the package thereof.
In this embodiment, when the electro-absorption modulator is simulated, an electro-optical element required in a simulation test process can be equivalent to a reactance or resistance device, and an actual guided wave transmission system can also be equivalent to a transmission line, so that a problem about a field in an optical communication process is converted into a problem about a path to be solved. In addition, the small-signal equivalent circuit model and the nonlinear behavior function of the electro-absorption modulator are introduced into the preset simulation software, and then the simulation operation in the preset simulation software is executed, so that the electro-absorption modulator and the package thereof can be simulated, and the simulation data corresponding to the electro-absorption modulator and the package thereof is output.
Further, step S30 further includes:
step c1, extracting packaging S parameters of the electroabsorption modulator, and building a simulation circuit diagram of the electroabsorption modulator based on the preset simulation software;
and c2, simulating the electroabsorption modulator and the package thereof according to the package S parameter, the small signal equivalent circuit model, the nonlinear behavior function and the simulation circuit diagram to obtain simulation data corresponding to the electroabsorption modulator and the package thereof.
In this embodiment, before simulating the electro-absorption modulator, a simulation circuit diagram required for the simulation test needs to be built, as shown in fig. 4, fig. 4 is a simulation circuit diagram of a preferred embodiment of the simulation method of the electro-absorption modulator of the present invention, a simulation circuit is built according to the simulation circuit schematic diagram shown in fig. 4, and CjThe voltage at the two ends is exchanged by a voltage control voltage source E568, and then the real optical output waveform (Pout) is obtained after the nonlinear function processing, and the nonlinear behavior of the electro-absorption modulator is considered. Specifically, 3D electromagnetic modeling can be performed through HFSS (High Frequency Structure Simulator), and a corresponding simulation environment is constructed to extract package S parameters of the electro-absorption modulator, where the package S parameters include reflection and transmission characteristic information during packaging of the electro-absorption modulator and phase information, and are mainly used to evaluate the packaging performance of the electro-absorption modulator. And then, a simulation circuit diagram is built by utilizing preset circuit simulation software, then simulation conditions such as packaging S parameters, a small signal equivalent circuit model, a nonlinear behavior function and the like of the electro-absorption modulator are sequentially introduced, and then cascade simulation is carried out, so that corresponding simulation data can be obtained, wherein the simulation data comprises but is not limited to data information such as reflection, loss, eye diagram, bandwidth, phase and the like. By taking into account non-linearities of electro-absorption modulatorsBy doing so, the electro-absorption modulator and its high frequency package performance can be evaluated accurately and comprehensively.
According to the simulation method of the electro-absorption modulator, a small-signal equivalent circuit model of the electro-absorption modulator is fitted through preset simulation software; obtaining a nonlinear behavior function of the electro-absorption modulator according to a preset bias current; and simulating the electroabsorption modulator according to the small-signal equivalent circuit model and the nonlinear behavior function to obtain simulation data corresponding to the electroabsorption modulator. When the electro-absorption modulator is simulated, the non-linear behavior of the electro-absorption modulator is considered, and the electro-absorption modulator and the high-frequency performance of the electro-absorption modulator after being packaged can be evaluated more accurately and comprehensively.
Further, based on the first embodiment of the simulation method of the electro-absorption modulator of the present invention, a second embodiment of the simulation method of the electro-absorption modulator of the present invention is proposed.
The second embodiment of the simulation method of the electro-absorption modulator is different from the first embodiment of the simulation method of the electro-absorption modulator in that after the step of obtaining the simulation data corresponding to the electro-absorption modulator, the method further comprises:
d, evaluating the performance of the electroabsorption modulator according to the simulation data to obtain a corresponding evaluation result;
and e, determining an optimization strategy of the electroabsorption modulator according to the evaluation result, and carrying out optimization design on the electroabsorption modulator according to the optimization strategy.
In this embodiment, the performance of the electroabsorption modulator is evaluated, and the performance of the packaged modulator, such as reflection coefficient, insertion loss, bandwidth, in-band flatness, eye pattern, and the like, may be evaluated to obtain a corresponding evaluation result, which may be a performance analysis report, and the like, where the evaluation result may show whether the package design of the electroabsorption modulator is successful. If the evaluation result shows that the package design of the electroabsorption modulator is successful, the electroabsorption modulator is qualified, and if the evaluation result does not reflect the package design success of the electroabsorption modulator, an optimization strategy corresponding to the electroabsorption modulator can be determined according to the evaluation result, wherein the optimization strategy comprises but is not limited to optimizing high-speed link impedance matching so as to reduce reflection; optimizing routing so as to compensate the bandwidth shortage of the modulator by utilizing the inductance of the gold wire; the grounding is optimized to reduce noise; the optimization strategy is used for carrying out comprehensive optimization design on the electro-absorption modulator, and the overall performance of the electro-absorption modulator is improved, so that the performance of the electro-absorption modulator is superior to that of an electro-absorption modulator chip after the electro-absorption modulator is packaged, namely, the optimization strategy is formulated, and the design of the electro-absorption modulator with better performance is facilitated. The simulation system is used for carrying out accurate and comprehensive simulation test on the electro-absorption modulator, so that risks can be evaluated in advance, a corresponding optimization strategy is found out, and the packaging design time and cost of the electro-absorption modulator are saved.
For example, when the performance of the electro-absorption modulator is evaluated according to the eye pattern in the simulation data, in general, the larger the eyes of the eye pattern are opened, the higher the eye height of the eye pattern is, which means the higher the signal quality corresponding to the electro-absorption modulator in the simulation test is. If the performance of the electro-absorption modulator is evaluated through the eye pattern, the signal quality of the electro-absorption modulator cannot achieve the expected effect, the inter-symbol interference in the signal transmission process can be reduced through adjusting the PCB winding form, optimizing the ceramic substrate design, adjusting the gold wire bonding quantity, adjusting the gold wire bonding form and other aspects, the transmission performance of a simulation system is improved, the eye height of the output eye pattern is increased, and the signal quality corresponding to the manufactured electro-absorption modulator can achieve the expected effect.
According to the simulation method of the electro-absorption modulator, performance evaluation is performed on the electro-absorption modulator through simulation data output by simulation tests, and then the corresponding optimization strategies are determined according to evaluation results, so that a manufacturer is facilitated to avoid risks, and design time and cost of the electro-absorption modulator are saved.
The invention also provides a simulation device of the electro-absorption modulator. Referring to fig. 5, the simulation apparatus of the electro-absorption modulator of the present invention includes:
the first fitting module 10 is used for fitting a small-signal equivalent circuit model of the electroabsorption modulator through preset simulation software;
the second fitting module 20 is configured to test a P-V characteristic curve of the electro-absorption modulator according to a preset bias current, and obtain a non-linear behavior function of the electro-absorption modulator according to the P-V characteristic curve;
and the joint simulation module 30 is configured to simulate the electroabsorption modulator and the package thereof according to the small-signal equivalent circuit model and the nonlinear behavior function, so as to obtain simulation data corresponding to the electroabsorption modulator and the package thereof.
Preferably, the first fitting module is further configured to:
testing a photoelectric S parameter of the electroabsorption modulator;
and fitting a small-signal equivalent circuit model of the electroabsorption modulator based on the preset simulation software and the photoelectric S parameter.
Preferably, the first fitting module is further configured to:
building a general equivalent circuit model of the electroabsorption modulator through preset simulation software;
and fitting the general equivalent circuit model based on the preset simulation software and the photoelectric S parameter so as to fit a small-signal equivalent circuit model of the electroabsorption modulator.
Preferably, the second fitting module is further configured to:
and testing the electro-absorption modulator based on at least three preset bias currents to obtain a P-V characteristic curve of the electro-absorption modulator.
Preferably, the joint simulation module is further configured to:
extracting a packaging S parameter of the electroabsorption modulator, and building a simulation circuit diagram of the electroabsorption modulator based on the preset simulation software;
and simulating the electro-absorption modulator and the package thereof according to the package S parameter, the small signal equivalent circuit model, the nonlinear behavior function and the simulation circuit diagram to obtain simulation data corresponding to the electro-absorption modulator and the package thereof.
Preferably, the simulation apparatus of the electro-absorption modulator further comprises an evaluation optimization module, the evaluation optimization module is configured to:
performing performance evaluation on the electroabsorption modulator according to the simulation data to obtain a corresponding evaluation result;
and determining an optimization strategy of the electroabsorption modulator according to the evaluation result so as to optimally design the electroabsorption modulator according to the optimization strategy.
The invention also provides a computer storage medium.
The computer storage medium of the present invention stores thereon a simulation program of the electro absorption modulator, which when executed by a processor, implements the steps of the simulation method of the electro absorption modulator as described above.
The method implemented when the simulation program of the electro absorption modulator running on the processor is executed may refer to each embodiment of the simulation method of the electro absorption modulator of the present invention, and is not described herein again.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk) as described above and includes instructions for enabling a terminal system (e.g., a mobile phone, a computer, a server, an air conditioner, or a network system) to execute the method according to the embodiments of the present invention.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (9)
1. A method for simulating an electroabsorption modulator, said method comprising the steps of:
fitting a small-signal equivalent circuit model of the electroabsorption modulator through preset simulation software;
testing a P-V characteristic curve of the electro-absorption modulator according to a preset bias current, and obtaining a nonlinear behavior function of the electro-absorption modulator according to the P-V characteristic curve;
and simulating the electroabsorption modulator and the package thereof according to the small signal equivalent circuit model and the nonlinear behavior function to obtain simulation data corresponding to the electroabsorption modulator and the package thereof.
2. The method for simulating an electro-absorption modulator as claimed in claim 1, wherein the step of fitting the small-signal equivalent circuit model of the electro-absorption modulator by the preset simulation software comprises:
testing a photoelectric S parameter of the electroabsorption modulator;
and fitting a small-signal equivalent circuit model of the electroabsorption modulator based on preset simulation software and the photoelectric S parameter.
3. The method of simulating an electroabsorption modulator as claimed in claim 2, wherein said step of fitting a small-signal equivalent circuit model of said electroabsorption modulator based on preset simulation software and said electro-optic S-parameters comprises:
building a general equivalent circuit model of the electroabsorption modulator through preset simulation software;
and fitting the general equivalent circuit model based on the preset simulation software and the photoelectric S parameter so as to fit a small-signal equivalent circuit model of the electroabsorption modulator.
4. The method for simulating an electro-absorption modulator as claimed in claim 1, wherein the step of testing the P-V characteristic curve of the electro-absorption modulator according to the preset bias current comprises:
and testing the electro-absorption modulator based on at least three preset bias currents to obtain a P-V characteristic curve of the electro-absorption modulator.
5. The method for simulating an electro-absorption modulator as claimed in claim 1, wherein the step of simulating the electro-absorption modulator and its package according to the small-signal equivalent circuit model and the nonlinear behavior function to obtain simulation data corresponding to the electro-absorption modulator and its package comprises:
extracting a packaging S parameter of the electroabsorption modulator, and building a simulation circuit diagram of the electroabsorption modulator based on the preset simulation software;
and simulating the electro-absorption modulator and the package thereof according to the package S parameter, the small signal equivalent circuit model, the nonlinear behavior function and the simulation circuit diagram to obtain simulation data corresponding to the electro-absorption modulator and the package thereof.
6. The method for simulating an electro-absorption modulator as claimed in claim 1, wherein said step of obtaining simulation data corresponding to said electro-absorption modulator and its package further comprises:
performing performance evaluation on the electroabsorption modulator according to the simulation data to obtain a corresponding evaluation result;
and determining an optimization strategy of the electroabsorption modulator according to the evaluation result so as to optimally design the electroabsorption modulator according to the optimization strategy.
7. An emulation apparatus of an electro-absorption modulator, comprising:
the first fitting module is used for fitting a small-signal equivalent circuit model of the electro-absorption modulator through preset simulation software;
the second fitting module is used for testing a P-V characteristic curve of the electro-absorption modulator according to a preset bias current and obtaining a nonlinear behavior function of the electro-absorption modulator according to the P-V characteristic curve;
and the joint simulation module is used for simulating the electroabsorption modulator and the package thereof according to the small-signal equivalent circuit model and the nonlinear behavior function to obtain simulation data corresponding to the electroabsorption modulator and the package thereof.
8. An emulation system for an electroabsorption modulator, comprising: memory, a processor and a simulation program of an electro absorption modulator stored on the memory and executable on the processor, the simulation program of an electro absorption modulator implementing the steps of the simulation method of an electro absorption modulator according to any of claims 1 to 6 when executed by the processor.
9. A computer storage medium, characterized in that the computer storage medium has stored thereon a simulation program of an electro absorption modulator, which when executed by a processor implements the steps of the simulation method of an electro absorption modulator according to any one of claims 1 to 6.
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