Signal modulation depth detection method, electronic equipment and computer readable storage medium

Abstract

The embodiment of the invention provides a signal modulation depth detection method, electronic equipment, a computer readable storage medium and a computer program product. The signal modulation depth detection method comprises the following steps: adjusting the bias voltage of an in-phase quadrature IQ modulator in an optical module to enable the phase difference of the IQ modulator to reach a target phase difference; loading a disturbance signal to the IQ modulator to enable the IQ modulator to be in a measurement state; stopping inputting the radio frequency signal to the IQ modulator, and acquiring a reference optical power signal from the output end of the IQ modulator; a radio frequency signal is input to the IQ modulator, and a measured optical power signal is acquired from the output end of the IQ modulator; and determining the signal modulation depth according to the reference optical power signal and the measurement optical power signal. According to the technical scheme, the modulation depth of the radio frequency signal can be simply, conveniently and accurately measured, so that the transmission quality of the signal can be well ensured.

Description

Technical Field

[0001] The embodiments of the present application relate to, but are not limited to, the field of communication technology, and in particular to a signal modulation depth detection method, an electronic device, a computer-readable storage medium, and a computer program product. Background Art

[0002] Coherent optical modules are essential components in Optical Transport Network (OTN) applications. They primarily convert service signals between optical and electrical, enabling service transport and dense wavelength division multiplexing (DWDM) transmission. Current coherent optical modules integrate coherent modulation and demodulation capabilities. At the transmitter, service signals are transmitted to a digital signal processor (DSP), where they are processed into high-speed, parallel radio frequency (RF) signals. The RF signals are then amplified by the transmission driver and then modulated by a Mach-Zehnder modulator (MZM). However, to ensure signal transmission quality, the modulation depth of the RF signal often needs to be controlled within an appropriate range. However, current methods for measuring the modulation depth of RF signals are inaccurate, resulting in issues with signal transmission quality. Summary of the Invention

[0003] The following is a summary of the subject matter described in detail herein. This summary is not intended to limit the scope of the claims.

[0004] The embodiments of the present application provide a signal modulation depth detection method, electronic device, computer-readable storage medium, and computer program product, which can easily and accurately measure the modulation depth of a radio frequency signal, thereby ensuring the transmission quality of the signal.

[0005] In a first aspect, an embodiment of the present application provides a signal modulation depth detection method, which is applied to an optical module. The method includes:

[0006] Adjusting a bias voltage of an in-phase quadrature (IQ) modulator in the optical module so that a phase difference of the IQ modulator reaches a target phase difference;

[0007] Applying a disturbance signal to the IQ modulator to put the IQ modulator in a measurement state;

[0008] Stop inputting a radio frequency signal to the IQ modulator and acquire a reference optical power signal from an output end of the IQ modulator; and inputting a radio frequency signal to the IQ modulator and acquire a measurement optical power signal from an output end of the IQ modulator;

[0009] A signal modulation depth is determined according to the reference optical power signal and the measured optical power signal.

[0010] In a second aspect, an embodiment of the present application provides an electronic device, including:

[0011] at least one processor;

[0012] at least one memory for storing at least one program;

[0013] When at least one of the programs is executed by at least one of the processors, the signal modulation depth detection method as described above is implemented.

[0014] In a third aspect, an embodiment of the present application provides a computer-readable storage medium storing computer-executable instructions, wherein the computer-executable instructions are used to execute the signal modulation depth detection method as described above.

[0015] In a fourth aspect, an embodiment of the present application provides a computer program product, including a computer program or computer instructions, wherein the computer program or the computer instructions are stored in a computer-readable storage medium, and the processor of a computer device reads the computer program or the computer instructions from the computer-readable storage medium, and the processor executes the computer program or the computer instructions, so that the computer device performs the signal modulation depth detection method as described above.

[0016] The embodiments of the present application include: in the process of detecting the signal modulation depth, it is necessary to adjust the bias voltage of the in-phase orthogonal IQ modulator in the optical module so that the phase difference of the IQ modulator reaches the target phase difference; load the disturbance signal to the IQ modulator so that the IQ modulator is in a measuring state; stop inputting the RF signal to the IQ modulator, and collect the reference optical power signal from the output end of the IQ modulator; and input the RF signal to the IQ modulator, and collect the measured optical power signal from the output end of the IQ modulator; determine the signal modulation depth based on the reference optical power signal and the measured optical power signal. According to the technical solution provided by the embodiments of the present application, in the process of detecting the signal modulation depth, the limitation of insufficient gain of the digital signal device and the driver can be avoided, and the modulation depth of the RF signal can be measured quickly and accurately, thereby ensuring the transmission quality of the signal well. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide a further understanding of the technical solution of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the technical solution of the present application and do not constitute a limitation on the technical solution of the present application.

[0018] Figure 1 This is a flow chart of a signal modulation depth detection method provided by an embodiment of the present application;

[0019] Figure 2 This is a flow chart of adjusting the bias voltage of an IQ modulator provided by one embodiment of the present application;

[0020] Figure 3 This is a flow chart of loading a disturbance signal to an IQ modulator provided by an embodiment of the present application;

[0021] Figure 4 This is a flow chart for determining signal modulation depth provided by one embodiment of the present application;

[0022] Figure 5 This is a flowchart of determining the strength of a reference signal component provided by an embodiment of the present application;

[0023] Figure 6 is a flowchart of determining the strength of a reference signal component provided by another embodiment of the present application;

[0024] Figure 7 This is a flow chart for determining the strength of a measurement signal component provided by one embodiment of the present application;

[0025] Figure 8 is a flow chart for determining the strength of a measurement signal component provided by another embodiment of the present application;

[0026] Figure 9 This is a flow chart of collecting a reference optical power signal provided by an embodiment of the present application;

[0027] Figure 10 This is a flowchart of collecting a reference optical power signal provided by another embodiment of the present application;

[0028] Figure 11 This is a flowchart of collecting a reference optical power signal provided by another embodiment of the present application;

[0029] Figure 12 This is a flowchart of shutting down a radio frequency signal provided by an embodiment of the present application;

[0030] Figure 13 This is a flowchart of shutting down a radio frequency signal provided by another embodiment of the present application;

[0031] Figure 14 is a flowchart of determining the strength of a reference signal component provided by another embodiment of the present application;

[0032] Figure 15 1 is a schematic diagram of an IQ modulator for performing a signal modulation depth detection method provided by an embodiment of the present application;

[0033] Figure 16 This is a schematic diagram of an IQ modulator provided by one embodiment of the present application for illustrating the principle of a signal modulation depth detection method;

[0034] Figure 17 This is a schematic diagram of the structure of an electronic device provided in one embodiment of the present application. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of this application more clear, the following further describes this application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0036] It should be noted that although the device schematics illustrate functional module divisions and the flowcharts illustrate logical sequences, in certain circumstances, the steps shown or described may be performed in a sequence that differs from the module divisions in the device or the sequence in the flowcharts. The terms "first," "second," and so on, in the specification, claims, and drawings, are used to distinguish similar items and are not necessarily used to describe a specific sequence or precedence.

[0037] In the description of this application, "several" means one or more, "many" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The terms "first" and "second" are used solely to distinguish technical features and are not to be construed as indicating or implying relative importance, or as implicitly specifying the number or order of the technical features indicated.

[0038] In the description of this application, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in this application based on the specific content of the technical solution.

[0039] The embodiments of the present application provide a method for detecting the depth of signal modulation, an electronic device, a computer-readable storage medium, and a computer program product. In the process of detecting the depth of signal modulation, it is first necessary to adjust the bias voltage of the in-phase orthogonal IQ modulator in the optical module so that the phase difference of the IQ modulator reaches the target phase difference; then the disturbance signal is loaded on the IQ modulator so that the IQ modulator is in a measuring state; then the input of the RF signal to the IQ modulator is stopped, and a reference optical power signal is collected from the output end of the IQ modulator; and the RF signal is input to the IQ modulator, and a measured optical power signal is collected from the output end of the IQ modulator; finally, the signal modulation depth can be determined based on the reference optical power signal and the measured optical power signal. According to the technical solution provided by the embodiments of the present application, in the process of detecting the signal modulation depth, the limitation of insufficient gain of the digital signal analyzer and the driver can be avoided, and the modulation depth of the RF signal can be measured quickly and accurately, thereby ensuring the transmission quality of the signal well.

[0040] The embodiments of the present application are further described below with reference to the accompanying drawings.

[0041] like Figure 1 As shown, an embodiment of the first aspect of the present application provides a flow chart of a method for detecting signal modulation depth, which includes but is not limited to steps S100, S200, S300, and S400.

[0042] Step S100, adjusting the bias voltage of the in-phase and quadrature IQ modulator in the optical module so that the phase difference of the IQ modulator reaches the target phase difference;

[0043] Step S200, applying a disturbance signal to the IQ modulator to put the IQ modulator in a measurement state;

[0044] Step S300: stop inputting a radio frequency signal to the IQ modulator and collect a reference optical power signal from the output of the IQ modulator; and inputting a radio frequency signal to the IQ modulator and collect a measurement optical power signal from the output of the IQ modulator;

[0045] Step S400: determining a signal modulation depth according to a reference optical power signal and a measured optical power signal.

[0046] In some embodiments of the present application, it is first necessary to adjust the bias voltage of the in-phase orthogonal IQ modulator in the optical module so that the phase difference of the IQ modulator reaches the target phase difference; then the disturbance signal is loaded on the IQ modulator so that the IQ modulator is in a measuring state; then the input of the RF signal to the IQ modulator is stopped, and a reference optical power signal is collected from the output end of the IQ modulator; and the RF signal is input to the IQ modulator, and a measured optical power signal is collected from the output end of the IQ modulator; finally, the signal modulation depth can be determined based on the reference optical power signal and the measured optical power signal. According to the technical solution provided in the embodiments of the present application, in the process of detecting the signal modulation depth, the limitation of insufficient gain of the digital signal device and the driver can be avoided, and the modulation depth of the RF signal can be measured quickly and accurately, thereby ensuring the transmission quality of the signal well.

[0047] It's worth noting that in-phase and quadrature IQ modulators can be incorporated into coherent optical modules. Coherent optical modules are essential and critical modules in optical transport network applications, primarily converting service signals between optical and electrical, enabling service carrying and dense wavelength division multiplexing transmission. Current coherent optical modules integrate coherent modulation and demodulation. At the transmitter, service signals are transmitted to a digital signal processor (DSP) and processed into high-speed, parallel radio frequency (RF) signals. The RF signals are then amplified by the transmission driver, and then modulated by a Mach-Zehnder modulator (MZM). The modulated lightwaves are then amplified or attenuated to control their output power. The MZMs currently used in coherent optical modules are mostly IQ modulators. During operation, when no RF signal is input, the phase difference between the in-phase and quadrature branches of the MZM sub-modules is 180°. The MZMs are in an extinction state, and the coherent optical module produces no optical output. When there is an RF signal input, the MZM is in a non-extinction state and the coherent optical module has light output; the larger the RF signal amplitude, the further the MZM deviates from the extinction state and the stronger the output light. The output power is maximum when the RF signal makes the phase difference between the two arms of the MZM zero. The modulation depth of the RF signal can be defined as the ratio of the output light intensity P at the current RF signal strength to the maximum output light intensity Pmax. Modulation depth is essentially a parameter that reflects the relative amplitude of the RF signal. The greater the modulation depth, the stronger the coherent optical module's output power. Modulation depth also affects the module's output signal quality. Excessive modulation depth can cause the modulation to operate in a nonlinear range, generating higher-order harmonics. This broadens the spectrum, degrades signal quality, increases signal crosstalk, and affects the module's optical signal-to-noise ratio (OSNR). Accurately measuring the modulation depth of RF signals and controlling it within an appropriate range are crucial for coherent optical modules.

[0048] It is worth noting that to accurately measure the modulation depth of the RF signal, it is necessary to increase the RF signal amplitude so that the module is in a saturated output state, and measure the module light output Pmax at this time as a reference value. However, in many cases, the gain of the module DSP and the gain of the driver are insufficient, resulting in the RF signal being unable to be amplified to a large enough level, resulting in the coherent optical module being unable to reach a saturated output state, and the modulation depth cannot be directly, simply and accurately measured; based on the embodiment of the present application, the bias voltage of the IQ modulator is first adjusted so that the phase difference of the IQ modulator reaches the target phase difference; then a disturbance signal is loaded to the IQ modulator so that the IQ modulator enters a measurement state; then, the RF signal is not input to the IQ modulator, and a reference optical power signal is obtained from the output end of the IQ modulator; then, the RF signal is input to the IQ modulator, and a measured optical power signal is obtained from the output end of the IQ modulator; finally, the signal modulation depth can be determined based on the reference optical power signal and the measured optical power signal, without relying on the use of a digital processor and a driver to perform gain amplification processing on the RF signal, so that the measurement of the signal modulation depth can be more accurate.

[0049] It can be understood that the bias voltage of the in-phase orthogonal IQ modulator in the optical module is adjusted so that the phase difference of the IQ modulator reaches the target phase difference, thereby enabling the IQ modulator to be in a normal working state and preparing for the subsequent measurement of the signal modulation depth.

[0050] It is worth noting that the embodiment of the present application uses a disturbance signal to assist in measuring the modulation depth of the RF signal; the optical module does not need to be in the maximum output state, and there is no requirement for the amplification capability of the driver and the digital processor; it only needs to collect data in the state without RF signal output and the state to be measured to obtain the modulation depth of the RF signal, which makes the measurement more convenient; and it is insensitive to other parameters that affect the output amplitude, such as the proportional roll-off coefficient, and the accuracy is greatly improved.

[0051] It is worth noting that the disturbance signal can be a square wave, a triangle wave or other periodic signals. The embodiment of the present application is mainly used in the performance optimization and adjustment stage of the coherent optical module. The main purpose of this stage is to optimize the various parameters of the module so that the module performance is optimal and can work normally. RF signal modulation depth measurement and adjustment is an important step. The application environment of the embodiment of the present application is mainly used in coherent optical modules. Among them, the coherent optical module does not need to have complete functions, but at least needs to have a digital processor, an IQ modulator, an optical device control circuit, a tunable laser, and does not need to have functions such as a demodulator amplifier at the receiving end. The IQ modulator can be a dual-polarization modulator or a single-polarization modulator. The IQ modulator has at least two electrodes that can adjust the phase difference of the I-path and Q-path MZM respectively.

[0052] like Figure 2 As shown, the IQ modulator includes an in-phase branch and a quadrature branch, the in-phase branch includes a first positive splitting branch and a first negative splitting branch, and the quadrature branch includes a second positive splitting branch and a second negative splitting branch. The above step S100 may include but is not limited to step S110.

[0053] In step S110, the DC bias voltage of the in-phase branch and the quadrature branch input to the IQ modulator is adjusted so that the phase difference between the first positive optical splitting branch and the first negative optical splitting branch is 180°, the phase difference between the second positive optical splitting branch and the second negative optical splitting branch is 180°, and the phase difference between the first positive optical splitting branch and the second positive optical splitting branch is 0°.

[0054] In some embodiments of the present application, in the process of adjusting the bias voltage of the IQ modulator in the optical module, the DC bias voltage of the in-phase branch and the orthogonal branch input to the IQ modulator is adjusted, and the phase difference between the first positive optical splitting branch and the first negative optical splitting branch is 180°, the phase difference between the second positive optical splitting branch and the second negative optical splitting branch is 180°, and the phase difference between the first positive optical splitting branch and the second positive optical splitting branch is 0°; through the above settings, the IQ modulator is in a normal working state and is prepared for subsequent signal modulation depth detection.

[0055] It is worth noting that the IQ modulator includes an in-phase branch and an orthogonal branch, and the in-phase branch includes a first positive optical splitting branch and a first negative optical splitting branch, and the orthogonal branch includes a second positive optical splitting branch and a second negative optical splitting branch; when the IQ modulator is in normal working condition, the phase difference between the first positive optical splitting branch and the first negative optical splitting branch is 180°, the phase difference between the second positive optical splitting branch and the second negative optical splitting branch is 180°, and the phase difference between the first positive optical splitting branch and the second positive optical splitting branch is 0°.

[0056] like Figure 3 As shown, the disturbance signal includes a first disturbance sub-signal and a second disturbance sub-signal, and the above step S200 may include but is not limited to step S210.

[0057] Step S210: Load a first perturbation sub-signal on the bias electrode of the in-phase branch, and load a second perturbation sub-signal on the bias electrode of the quadrature branch, wherein the first perturbation sub-signal and the second perturbation sub-signal have the same frequency and a phase difference of 90°.

[0058] In some embodiments of the present application, when the IQ modulator is in normal working state, a first perturbation sub-signal can be loaded on the bias electrode of the in-phase branch, and a second perturbation sub-signal can be loaded on the bias electrode of the orthogonal branch, and the frequencies of the first perturbation sub-signal and the second perturbation sub-signal are made the same, and the phases of the first perturbation sub-signal and the second perturbation sub-signal differ by 90°, thereby making the IQ modulator enter the measurement state and making prerequisite preparations for the subsequent measurement of the modulation depth.

[0059] like Figure 4 As shown, the above step S400 may include but is not limited to step S410, step S420 and step S430.

[0060] Step S410, determining the reference signal component strength according to the reference optical power signal; and determining the measurement signal component strength according to the measurement optical power signal;

[0061] Step S420, taking a ratio of the strength of the measured signal component to the strength of the reference signal component to obtain a proportional value;

[0062] Step S430: Determine the signal modulation depth according to the ratio value.

[0063] In some embodiments of the present application, in the process of determining the signal modulation depth based on the reference optical power signal and the measured optical power signal, the reference signal component intensity is first determined based on the reference optical power signal, and the measured signal component intensity is determined based on the measured optical power signal; then the ratio of the measured signal component intensity and the reference signal component intensity is calculated to obtain a proportional value; finally, the signal modulation depth can be determined based on the proportional value; through the above technical solution, the signal modulation depth can be measured and processed simply, quickly and accurately without relying on the amplification function of the digital processor and the driver.

[0064] like Figure 5 As shown, the above step S410 may include but is not limited to step S411.

[0065] Step S411: Perform Fourier transform processing on the reference optical power signal to obtain the reference signal component intensity.

[0066] In some embodiments of the present application, in the process of determining the reference signal component strength based on the reference optical power signal, the reference signal component strength can be obtained by directly performing Fourier transform processing on the reference optical power signal, making the process of obtaining the reference signal component strength simpler and faster.

[0067] like Figure 6 As shown, the above step S410 may include but is not limited to step S412.

[0068] Step S412: performing overlapping integration operation on the reference optical power signal and the disturbance signal to obtain the reference signal component intensity.

[0069] In some embodiments of the present application, in the process of determining the reference signal component strength based on the reference optical power signal, the reference signal component strength can be obtained by performing overlapping integration operations on the reference optical power signal and the disturbance signal, and the reference signal component strength can also be obtained quickly.

[0070] like Figure 7 As shown, the above step S410 may include but is not limited to step S413.

[0071] Step S413: Perform Fourier transform processing on the measurement optical power signal to obtain the measurement signal component intensity.

[0072] In some embodiments of the present application, in the process of determining the measurement signal component intensity based on the measurement optical power signal, the measurement signal component intensity can be obtained by directly performing Fourier transform processing on the measurement optical power signal, making the process of obtaining the measurement signal component intensity simpler and faster.

[0073] like Figure 8 As shown, the above step S410 may include but is not limited to step S414.

[0074] Step S414: performing overlapping integration operation on the measurement optical power signal and the disturbance signal to obtain the intensity of the measurement signal component.

[0075] In some embodiments of the present application, in the process of determining the measurement signal component strength based on the measurement optical power signal, the measurement signal component strength can be obtained by performing overlapping integration operations on the measurement optical power signal and the disturbance signal, and the measurement signal component strength can also be quickly calculated.

[0076] like Figure 9 As shown, the above step S300 may include but is not limited to step S310.

[0077] Step S310: Using a power meter to collect a reference optical power signal from the output end of the IQ modulator.

[0078] In some embodiments of the present application, the corresponding reference optical power signal can be obtained by directly collecting data from the output end of the IQ modulator using a power meter, and the entire measurement process is simple and fast.

[0079] like Figure 10 As shown, the above step S300 may include but is not limited to step S320.

[0080] Step S320: Using a spectrometer to collect a reference optical power signal from the output end of the IQ modulator.

[0081] In some embodiments of the present application, a corresponding reference optical power signal can also be obtained by directly using a spectrometer to collect data from the output end of the IQ modulator, and the measurement process is simple, convenient and accurate.

[0082] like Figure 11 As shown, the above step S300 may include but is not limited to step S330.

[0083] Step S330 : Using a photodiode to perform photoelectric conversion on the optical signal output from the output end of the IQ modulator to obtain a current signal, and using a current measurement monitoring system to detect and process the current signal to obtain a reference optical power signal.

[0084] In some embodiments of the present application, in the process of detecting the reference optical power signal, a photodiode is first used to perform photoelectric conversion on the optical signal output from the output end of the IQ modulator to obtain a current signal. Then, the obtained current signal can be detected and processed using a current measurement monitoring system to obtain the corresponding reference optical power signal. The entire detection process is accurate and reliable.

[0085] It is worth noting that the acquisition and detection of the measured optical power signal can be based on the same detection method as the reference optical power signal. That is, the reference optical power signal can be acquired from the output of the IQ modulator using a power meter; the reference optical power signal can be acquired from the output of the IQ modulator using a spectrometer; or the optical signal output from the output of the IQ modulator can be converted into a current signal by photoelectric conversion using a photodiode. The reference optical power signal can then be detected and processed using a current measurement monitoring system.

[0086] It is worth noting that in the process of collecting and detecting the reference optical power signal and the measured optical power signal using a photodiode and a current measurement detection system, the photodiode and the current measurement detection system can be set outside the optical module; the photodiode and the current measurement detection system can also be set inside the optical module; or, the photodiode is set inside the optical module, and the current measurement detection system is set outside the optical module.

[0087] like Figure 12As shown, the above step S300 may include but is not limited to step S340.

[0088] Step S340: Turn off the digital signal device in the optical module to turn off the radio frequency signal.

[0089] In some embodiments of the present application, in order to stop sending the radio frequency signal to the IQ modulator, the digital signal device in the optical module may be turned off, so that the radio frequency signal stops being input to the IQ modulator.

[0090] like Figure 13 As shown, the above step S300 may include but is not limited to step S350.

[0091] Step S350: Turn off the driver in the optical module to turn off the radio frequency signal.

[0092] In some embodiments of the present application, in order to stop sending the radio frequency signal to the IQ modulator, the driver in the optical module may also be turned off, so that the radio frequency signal stops being input to the IQ modulator.

[0093] like Figure 14 As shown, before executing the above step S412, the signal modulation depth detection method further includes but is not limited to step S415.

[0094] Step S415: filter the reference optical power signal.

[0095] In some embodiments of the present application, the reference optical power signal may be filtered by a bandpass filter before performing the overlap integral calculation, wherein the filter may be implemented as an actual circuit or a digital filter.

[0096] It should be noted that before executing the above step S414, a bandpass filter may also be used to perform filtering processing on the measured optical power signal.

[0097] In order to more clearly illustrate the process of the signal modulation depth detection method provided by the embodiment of the present invention, a specific example is given below for illustration.

[0098] like Figure 15 As shown, adjust the IQ bias DC bias voltage until the phase difference between the two arms of the IQ sub-MZM is 180°, working at the extinction point, and adjust the phase difference between the two main MZMs of IQ to 0°. The purpose is to make the IQ modulator in normal working state. The voltage at this time is recorded as V I and V Q .

[0099] The bias electrodes of I and Q paths of IQ are loaded with dither signals of the same frequency and phase orthogonality, where the I path signal can be expressed as The Q-path signal can be expressed as Where V D is the dither signal amplitude, ω D is the dither signal frequency, Here, the dither signals of I and Q can be interchanged, that is, I plus Q can be Q Luke That is, keep I and Q paths The dither signal here is the AC dither signal added on the basis of the DC bias voltage maintaining the phase difference of 180°, that is, the voltage loaded on the bias electrode at this time is and

[0100] Turn off the RF signal. This can be achieved by turning off the DSP gain or the driver gain. This step is for collecting a reference signal.

[0101] Collect the optical power signal P0(t) and calculate the frequency to be 2ω D The signal component strength is A0. The calculated frequency is 2ω D The methods for calculating the signal component strength include but are not limited to: 1. FFT (DFT) transformation calculation method. Perform FFT (DFT) transformation on the collected P0(t) signal to directly obtain the frequency 2ω D 2. Overlapping integral method. Combine the P(t) signal with Multiplying and integrating, we get a frequency of 2ω. D The signal component strength is given by Where T is the integration cycle time, T needs to be An integer multiple of .

[0102] Turn on the RF signal and apply the RF signal to be measured to the IQ modulator.

[0103] Collect the optical power signal P1(t) and calculate the frequency to be 2ω D The signal component strength is A1. The calculated frequency is 2ω D The methods for calculating the signal component strength include but are not limited to: 1. FFT (DFT) transformation calculation method. Perform FFT (DFT) transformation on the collected P1(t) signal to directly obtain the frequency 2ω D 2. Overlapping integral method. Combine the P(t) signal with Do the product and integrate to get the signal component intensity with a frequency of 2ωD, the formula is Where T is the integration cycle time, T needs to be An integer multiple of .

[0104] Calculate the modulation depth, the modulation depth is

[0105] like Figure 16 As shown, the principle of this application and the derivation of related steps can be as follows:

[0106] When the IQ modulator is working, the unmodulated laser is input on the left side, and the electric field intensity can be expressed as E in , is evenly divided into I and Q paths by the beam splitter, denoted as E Q ,E I There is a sub-MZM on each line, and each sub-MZM has two arms, P and N. The insertion loss of the four arms is expressed as α IP ,α IN ,α QP ,α QN Each sub-MZM also has an RF electrode and a phase locker. The RF electrode is used to load the RF modulation signal to perform high-speed phase modulation on the laser, and its voltage can be expressed as V RFI ,V RFQ The differential phase amplitude of this voltage on the upper and lower arms is Adding voltage to the phaselocker can adjust the phase difference between the two arms of the MZM, which are After phase modulation and attenuation, the electric field strength of the four arms is recorded as E IP ,E IN ,E QP ,E QN After the beam is combined, the electric field of I and Q is recorded as E XI ,E XQ There is also a phase locker on the IQ circuit. Applying voltage to it can adjust the phase difference between the IQ circuits. Finally, the IQ two-way light intensity is combined, and the electric field intensity is E X , detected after the final PD.

[0107] When the IQ modulator is working normally, the phase difference between the two arms of the DC bias MZM on the phase locker of the sub-MZM is 180 degrees. In general, the difference in loss of the four arms of the modulator can be ignored, that is, α IP ≈α IN ≈α QP ≈α QN =α, the amplitude difference of RF signal can also be ignored, that is, The electric field output after the modulator can be expressed as:

[0108]

[0109]

[0110]

[0111] The instantaneous power monitored on the PD is:

[0112]

[0113] Considering the average effect of RF high-speed signals, the power monitored on the PD is:

[0114]

[0115] So the phase change caused by the RF signal The larger the value, the greater the output power. When the maximum optical power is

[0116]

[0117] So the modulation depth can be expressed as

[0118]

[0119] This is also the traditional RF signal modulation depth measurement method.

[0120] When the dither signal is added to the IQ path, the phase change amplitude caused by the dither signal is The phase change caused by the dither signal is

[0121]

[0122]

[0123] Then, the light intensity signal monitored on the PD is

[0124]

[0125] because After approximation, only Item is

[0126]

[0127] Then the value obtained after integration is

[0128]

[0129] When the RF signal is turned off,

[0130]

[0131] When the RF signal is turned on,

[0132]

[0133] The modulation depth is

[0134]

[0135] In addition, if Figure 17 As shown, an embodiment of the present application further provides an electronic device 700, which includes:

[0136] The memory 720 , the processor 710 , and computer programs stored in the memory 720 and executable on the processor 710 .

[0137] The processor 710 and the memory 720 may be connected via a bus or other means.

[0138] It should be noted that the electronic device 700 in this embodiment and the signal modulation depth detection method in the above embodiments belong to the same inventive concept, so these embodiments have the same implementation principles and technical effects, which will not be described in detail here.

[0139] The non-transient software program and instructions required to implement the signal modulation depth detection method of the above embodiment are stored in the memory 720 , and when executed by the processor 710 , the signal modulation depth detection method of the above embodiment is performed.

[0140] In addition, an embodiment of the present application also provides a computer-readable storage medium, which stores computer-executable instructions, and the computer-executable instructions are executed by a processor 710, for example, by a processor 710 in the above-mentioned electronic device 700 embodiment, so that the above-mentioned processor 710 can execute the signal modulation depth detection method in the above-mentioned embodiment.

[0141] In addition, an embodiment of the present application also provides a computer program product, including a computer program or computer instructions, wherein the computer program or the computer instructions are stored in a computer-readable storage medium, and the processor of a computer device reads the computer program or the computer instructions from the computer-readable storage medium, and the processor executes the computer program or the computer instructions, so that the computer device executes the signal modulation depth detection method in the above embodiment.

[0142] Those skilled in the art will appreciate that all or some of the steps and systems in the method disclosed above can be implemented as software, firmware, hardware, and appropriate combinations thereof. Some physical components or all physical components can be implemented as software executed by a processor, such as a central processing unit, a digital signal processor, or a microprocessor, or implemented as hardware, or implemented as an integrated circuit, such as an application-specific integrated circuit. Such software can be distributed on a computer-readable medium, and the computer-readable medium can include computer storage media (or non-transitory media) and communication media (or temporary media). As known to those skilled in the art, the term computer storage media is included in any method or technology for storing information (such as computer-readable instructions, data structures, program modules, or other data) and is volatile and non-volatile, removable, and non-removable. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory, or other memory technology, CD-ROM, digital versatile disks (DVD), or other optical disk storage, magnetic cassettes, magnetic tapes, disk storage, or other magnetic storage devices, or any other medium that can be used to store desired information and can be accessed by a computer. Furthermore, as is well known to those skilled in the art, communication media typically embodies computer-readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media.

[0143] The above is a specific description of the preferred implementation of the present application, but the present application is not limited to the above implementation mode. Technical personnel familiar with the field can also make various equivalent modifications or substitutions without violating the spirit of the present application. These equivalent modifications or substitutions are all included in the scope defined by the claims of the present application.

Claims

1. A signal modulation depth detection method, applied to an optical module, comprising: Adjusting the bias voltage of the in-phase orthogonal IQ modulator in the optical module so that the phase difference of the IQ modulator reaches a target phase difference; Applying a disturbance signal to the IQ modulator to put the IQ modulator in a measurement state; Stop inputting a radio frequency signal to the IQ modulator, and collect a reference optical power signal from an output end of the IQ modulator; and inputting a radio frequency signal into the IQ modulator, and acquiring a measurement optical power signal from an output end of the IQ modulator; A signal modulation depth is determined according to the reference optical power signal and the measured optical power signal.

2. The signal modulation depth detection method according to claim 1, wherein: The IQ modulator includes an in-phase branch and a quadrature branch, the in-phase branch includes a first positive splitting branch and a first negative splitting branch, the quadrature branch includes a second positive splitting branch and a second negative splitting branch, and the bias voltage of the in-phase and quadrature IQ modulator in the optical module is adjusted so that the phase difference of the IQ modulator reaches a target phase difference, including: The DC bias voltages of the in-phase branch and the quadrature branch input to the IQ modulator are adjusted so that the phase difference between the first positive optical splitting branch and the first negative optical splitting branch is 180°, the phase difference between the second positive optical splitting branch and the second negative optical splitting branch is 180°, and the phase difference between the first positive optical splitting branch and the second positive optical splitting branch is 0°.

3. The signal modulation depth detection method according to claim 2, characterized in that: The disturbance signal includes a first disturbance sub-signal and a second disturbance sub-signal, and the loading of the disturbance signal on the IQ modulator so as to put the IQ modulator in a measurement state includes: The first perturbation sub-signal is loaded on the bias electrode of the in-phase branch, and the second perturbation sub-signal is loaded on the bias electrode of the orthogonal branch, wherein the first perturbation sub-signal and the second perturbation sub-signal have the same frequency and a phase difference of 90°.

4. The signal modulation depth detection method according to claim 1, wherein: The determining the signal modulation depth according to the reference optical power signal and the measured optical power signal includes: Determining a reference signal component strength based on the reference optical power signal; and determining a measurement signal component strength based on the measurement optical power signal; Ratioing the strength of the measurement signal component to the strength of the reference signal component to obtain a proportional value; The signal modulation depth is determined according to the ratio value.

5. The signal modulation depth detection method according to claim 4, characterized in that: Determining the reference signal component strength according to the reference optical power signal includes at least one of the following: Performing Fourier transform processing on the reference optical power signal to obtain the reference signal component intensity; or, An overlap integration operation is performed on the reference optical power signal and the disturbance signal to obtain the reference signal component intensity.

6. The signal modulation depth detection method according to claim 4, characterized in that: Determining the intensity of the measurement signal component according to the measurement optical power signal includes at least one of the following: Performing Fourier transform processing on the measurement optical power signal to obtain the measurement signal component intensity; or, An overlapping integration operation is performed on the measurement optical power signal and the disturbance signal to obtain the measurement signal component intensity.

7. The signal modulation depth detection method according to claim 5, characterized in that: The step of acquiring a reference optical power signal from the output end of the IQ modulator includes at least one of the following: Using a power meter to collect the reference optical power signal from the output end of the IQ modulator; Using a spectrometer to collect the reference optical power signal from the output end of the IQ modulator; The optical signal output from the output end of the IQ modulator is photoelectrically converted by using a photodiode to obtain a current signal, and the current measurement monitoring system is used to detect and process the current signal to obtain the reference optical power signal.

8. The signal modulation depth detection method according to claim 1, wherein: The stopping of inputting the radio frequency signal to the IQ modulator includes at least one of the following: Turning off the digital signal device in the optical module to turn off the radio frequency signal; The driver in the optical module is turned off to turn off the radio frequency signal.

9. The signal modulation depth detection method according to claim 5, characterized in that: Before performing overlapping integration operation on the reference optical power signal and the disturbance signal to obtain the reference signal component intensity, the signal modulation depth detection method further includes: Perform filtering processing on the reference optical power signal.

10. An electronic device, characterized in that: include: at least one processor; at least one memory for storing at least one program; When at least one of the programs is executed by at least one of the processors, the signal modulation depth detection method according to any one of claims 1 to 9 is implemented.

11. A computer-readable storage medium storing computer-executable instructions, characterized in that: The computer-executable instructions are used to execute the signal modulation depth detection method according to any one of claims 1 to 9.

12. A computer program product comprising a computer program or computer instructions, characterized in that The computer program or the computer instructions are stored in a computer-readable storage medium, and the processor of the computer device reads the computer program or the computer instructions from the computer-readable storage medium. The processor executes the computer program or the computer instructions, so that the computer device performs the signal modulation depth detection method according to any one of claims 1 to 9.

Images