CN117650840B - Loss horizontal inspection method and system for wavelength optical circulator - Google Patents
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Abstract
The invention provides a loss horizontal inspection method and a loss horizontal inspection system for a wavelength optical circulator, which are applied to the field of signal transmission inspection; the invention obtains nonlinear response data through dynamic test, can comprehensively understand the response condition of the wavelength optical circulator to different signal parameters, is beneficial to finding potential nonlinear effects such as frequency multiplication and frequency mixing, reduces errors possibly caused by the nonlinear effects to the inspection loss level, simultaneously limits the frequency range, disperses the input optical power, reduces the power density, is beneficial to reducing the influence of the nonlinear effects, optimizes the test conditions, ensures that the performance of the wavelength optical circulator in a specific working range is more stable, and improves the inspection stability of the system to the loss level.
Description
Technical Field
The invention relates to the field of signal transmission inspection, in particular to a loss level inspection method and a loss level inspection system for a wavelength optical circulator.
Background
Current wavelength optical circulators typically achieve signal input and output by coupling of optical waves, but coupling loss may occur due to imperfect coupling between waveguides, inaccurate fabrication of coupling devices, or inaccurate alignment, and imperfect coupling may cause a portion of the optical waves to be incorrectly coupled into or output from the circulator, thereby causing transmission loss.
Disclosure of Invention
The invention aims to solve the problem that signal transmission is damaged due to coupling loss of a wavelength optical circulator, and provides a loss horizontal inspection method and a loss horizontal inspection system of the wavelength optical circulator.
The invention adopts the following technical means for solving the technical problems:
the invention provides a loss horizontal inspection method of a wavelength optical circulator, which comprises the following steps:
recording at least two reference power values of corresponding output ports of the wavelength optical circulator when no light signal is injected into the wavelength optical circulator;
judging whether the reference power value has preset fluctuation or not;
if not, re-accessing the wavelength optical circulator to an input port of a preset light source, measuring the input light power of the light source injected into the wavelength optical circulator, applying a preset dynamic test to modulate signal parameters of the wavelength optical circulator, recording a response curve of the dynamic test to the wavelength optical circulator, and generating nonlinear response data of the input light power, wherein the signal parameters comprise signal frequency, signal amplitude and signal waveform;
judging whether a preset nonlinear effect exists in the nonlinear response data, wherein the nonlinear effect specifically comprises frequency multiplication and frequency mixing;
If yes, detecting end face information of a preset optical fiber, limiting the working temperature of the wavelength optical circulator, limiting an optical signal in a preset frequency range by using a preset optical filter, dispersing the input optical power into a preset mode area, reducing the power density of the input optical power according to the mode area, and calculating the transmission loss of the wavelength optical circulator according to a preset formula.
Further, the step of re-connecting the wavelength optical circulator to an input port of a preset light source and measuring the input optical power of the light source injected into the wavelength optical circulator further includes:
based on a preset output port of the wavelength optical circulator, a preset reverse optical signal is introduced into the output port;
judging whether the output intensity of the reverse optical signal exceeds the preset bearing intensity of the wavelength optical circulator or not;
if yes, limiting the maximum output intensity of the reverse optical signal to the wavelength optical circulator, rotationally measuring the polarization state of the wavelength optical circulator by applying preset polarization content, recording at least two response parameters of the wavelength optical circulator in each polarization state, and obtaining a response average value from the response parameters.
Further, before the step of modulating the signal parameter of the wavelength optical circulator by applying the preset dynamic test, the method further includes:
identifying a power level of the light source;
judging whether the power level exceeds the bearing range of a preset optical element or not;
if yes, calibrating the power threshold of the optical element, detecting the loss parameter of the optical element, and acquiring the nonlinear effect threshold of the optical element based on the loss parameter, wherein the loss parameter specifically comprises optical loss, transmittance and refractive index.
Further, the step of dispersing the input optical power into a preset mode area and reducing the power density of the input optical power according to the mode area further includes:
acquiring initial wavelength data of the light source based on a preset monitoring device, and identifying wavelength drift frequency from the initial wavelength data;
judging whether the wavelength drift frequency is larger than a preset frequency or not;
if yes, recalibrating the light source and the pre-recorded standard wavelength, detecting the arrangement direction of a preset optical element, and limiting the use authority of the optical element in a preset time period at regular time.
Further, the step of determining whether the reference power value has a preset fluctuation further includes:
acquiring periodic characteristic parameters of the reference power value, wherein the periodic characteristic parameters specifically comprise amplitude, period length and waveform shape;
judging whether the periodic characteristic parameters can present preset specific content or not, wherein the specific content is specifically a specific pattern which can be identified or repeated and is presented in preset time;
if not, detecting the setting parameters of the light source, introducing a preset voltage stabilizer to optimize the power supply noise of the light source based on the setting parameters, and matching the periodic fluctuation of the light source with a preset experimental frequency by applying preset frequency tuning, wherein the setting parameters specifically comprise the stability of the light source, the power supply and the mechanical vibration.
Further, the step of determining whether a preset nonlinear effect exists in the nonlinear response data further includes:
performing linear fitting on the nonlinear response data by using preset linear regression to generate a residual value corresponding to the linear fitting, wherein the residual value is specifically the difference between an observed value and a fitting value;
Judging whether the residual error value shows a preset trend or not;
if yes, a data scatter diagram of the nonlinear response data is drawn, nonlinear shapes formed on the data scatter diagram are identified, and trend change information in the data scatter diagram is analyzed according to the nonlinear shapes and the response curve, wherein the trend change information specifically comprises exponential growth and saturation trend.
Further, when the wavelength-based optical circulator is in no-light signal injection, the step of recording at least two reference power values of the output ports corresponding to the wavelength-based optical circulator further includes:
simultaneously measuring a preset signal and a reference signal by adopting preset differential mode measurement, and obtaining common mode interference data in the preset signal and the reference signal;
judging whether the common mode interference data are derived from the same kind of noise;
if yes, calculating the difference between the preset signal and the reference signal, generating a corresponding differential signal, and carrying out balance processing on the differential signal by using a preset differential mode amplifier to counteract common mode noise of the differential signal.
The invention also provides a loss level inspection system of the wavelength optical circulator, which comprises:
The recording module is used for recording at least two reference power values of the corresponding output port of the wavelength optical circulator based on the fact that the wavelength optical circulator is in the state of no light signal injection;
the judging module is used for judging whether the reference power value has preset fluctuation or not;
the execution module is used for re-accessing the wavelength optical circulator to an input port of a preset light source if not, measuring the input optical power of the light source injected into the wavelength optical circulator, applying a preset dynamic test to modulate signal parameters of the wavelength optical circulator, recording a response curve of the dynamic test to the wavelength optical circulator, and generating nonlinear response data of the input optical power, wherein the signal parameters specifically comprise signal frequency, signal amplitude and signal waveform;
the second judging module is used for judging whether a preset nonlinear effect exists in the nonlinear response data, wherein the nonlinear effect specifically comprises frequency multiplication and frequency mixing;
and the second execution module is used for detecting the end face information of the preset optical fiber if the input optical power is detected, limiting the working temperature of the wavelength optical circulator, applying a preset optical filter to limit the optical signal within a preset frequency range, dispersing the input optical power into a preset mode area, reducing the power density of the input optical power according to the mode area, and calculating the transmission loss of the wavelength optical circulator according to a preset formula.
Further, the execution module further includes:
the introducing unit is used for introducing a preset reverse optical signal to the output port based on the preset output port of the wavelength optical circulator;
the judging unit is used for judging whether the output intensity of the reverse optical signal exceeds the preset bearing intensity of the wavelength optical circulator;
and the execution unit is used for limiting the maximum output intensity of the reverse optical signal to the wavelength optical circulator if the reverse optical signal is positive, applying preset polarization content to rotate and measure the polarization state of the wavelength optical circulator, recording at least two response parameters of the wavelength optical circulator in each polarization state, and obtaining a response average value from the response parameters.
Further, the method further comprises the following steps:
an identification module for identifying a power level of the light source;
a third judging module for judging whether the power level exceeds the bearing range of the preset optical element;
and the third execution module is used for calibrating the power threshold of the optical element if the power threshold is met, detecting the loss parameter of the optical element, and acquiring the nonlinear effect threshold of the optical element based on the loss parameter, wherein the loss parameter specifically comprises optical loss, transmittance and refractive index.
The invention provides a loss horizontal inspection method and a loss horizontal inspection system for a wavelength optical circulator, which have the following beneficial effects:
the invention obtains nonlinear response data through dynamic test, can comprehensively understand the response condition of the wavelength optical circulator to different signal parameters, is beneficial to finding potential nonlinear effects such as frequency multiplication and frequency mixing, reduces errors possibly caused by the nonlinear effects to the inspection loss level, simultaneously limits the frequency range, disperses the input optical power, reduces the power density, is beneficial to reducing the influence of the nonlinear effects, optimizes the test conditions, ensures that the performance of the wavelength optical circulator in a specific working range is more stable, and improves the inspection stability of the system to the loss level.
Drawings
FIG. 1 is a flow chart of an embodiment of a method for inspecting the loss level of a wavelength optical circulator according to the present invention;
fig. 2 is a block diagram of a loss level detection system for a wavelength optical circulator according to an embodiment of the invention.
Detailed Description
It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present invention, as the achievement, functional features, and advantages of the present invention are further described with reference to the embodiments, with reference to the accompanying drawings.
The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, a method for inspecting loss level of a wavelength optical circulator according to an embodiment of the invention includes:
s1: recording at least two reference power values of corresponding output ports of the wavelength optical circulator when no light signal is injected into the wavelength optical circulator;
s2: judging whether the reference power value has preset fluctuation or not;
s3: if not, re-accessing the wavelength optical circulator to an input port of a preset light source, measuring the input light power of the light source injected into the wavelength optical circulator, applying a preset dynamic test to modulate signal parameters of the wavelength optical circulator, recording a response curve of the dynamic test to the wavelength optical circulator, and generating nonlinear response data of the input light power, wherein the signal parameters comprise signal frequency, signal amplitude and signal waveform;
S4: judging whether a preset nonlinear effect exists in the nonlinear response data, wherein the nonlinear effect specifically comprises frequency multiplication and frequency mixing;
s5: if yes, detecting end face information of a preset optical fiber, limiting the working temperature of the wavelength optical circulator, limiting an optical signal in a preset frequency range by using a preset optical filter, dispersing the input optical power into a preset mode area, reducing the power density of the input optical power according to the mode area, and calculating the transmission loss of the wavelength optical circulator according to a preset formula.
In this embodiment, the system records at least two reference power values output by the wavelength optical circulator corresponding to the output port based on the condition that the wavelength optical circulator is in no-light signal injection, and then the system judges whether the reference power values have preset fluctuation conditions or not so as to execute corresponding steps; for example, when the system determines that there is a preset fluctuation in these reference power values output by the output port of the wavelength optical circulator, the system considers that the optical system of the wavelength optical circulator has a change or instability in some aspects, possibly caused by factors of environmental conditions, fluctuation of light sources and state change of optical elements, and the system helps to trace back the cause of fluctuation by checking parameters such as temperature and humidity for recording the environmental conditions, which might be related to the change of the environmental conditions, by recording these parameters to know whether there is an influence related to the environment, and simultaneously implementing dynamic monitoring, observing real-time change of the reference power values during experiments or system operation, the dynamic monitoring can reveal fluctuation related to actual operation or signal modulation, and recording any abnormal events such as power supply change, device switch or temperature fluctuation which might cause fluctuation of the reference power values; for example, when the system determines that the reference power values output by the output port of the wavelength optical circulator do not have preset fluctuation, the system considers that the optical system of the wavelength optical circulator does not have variation or instability, the system re-connects the pre-disconnected wavelength optical circulator to the input port corresponding to the preset light source, measures the input optical power of the light source when the light source is injected into the wavelength optical circulator, applies preset dynamic test to modulate the signal parameters of the wavelength optical circulator, records the response curve of the dynamic test to the wavelength optical circulator, generates nonlinear response data of the input optical power, can evaluate the performance of the wavelength optical circulator more comprehensively by measuring the nonlinear response data of the input optical power so as to know the response of different input optical powers, is helpful for determining the working range and the performance limit of the wavelength optical circulator, simultaneously records the response curve of the dynamic test to the wavelength optical circulator so as to be helpful for revealing the dynamic behavior of the system under different signal conditions, is vital for real-time application and debugging, can be used for verifying whether the system accords with expected performance or not, and the nonlinear response data provides key response data for improving the nonlinear response of the optical system, and can analyze the linear response effect parameters and optimize the coupling efficiency of the system; then the system judges whether the nonlinear response data of the input optical power has a nonlinear effect preset or not so as to execute corresponding steps; for example, when the system determines that there is no pre-set nonlinear effect on the nonlinear response data of the input optical power, the system considers that the linear response is exhibited under the current test condition, possibly because the change of the input optical power does not reach the threshold value of the obvious nonlinear effect generated by the system, the system can test by increasing the change range of the input optical power or changing the wavelength of the light source, and the nonlinear effect can only appear under the specific condition, and meanwhile, the resolution of the measuring system is increased to more finely detect the possible nonlinear response, and the performances of the light source, the detector and other optical elements are verified, so that the states of the optical system and the measuring device can be confirmed to work according to the expectations; for example, when the system determines that there is a preset nonlinear effect on the nonlinear response data of the input optical power, the system considers that the nonlinear effect appears under the current test condition, the system can limit the working temperature of the wavelength optical circulator by detecting the end surface information of the preset optical fiber, limit the optical signal in the preset frequency range by using the preset optical filter, disperse the input optical power into a preset mode area, reduce the power density of the input optical power according to the content of the mode area, and finally calculate the transmission loss of the wavelength optical circulator according to the preset formula, by detecting the end surface information of the preset optical fiber, the quality and stability of the optical fiber connection can be ensured, the loss and distortion of the optical signal in the transmission process can be reduced, meanwhile, the working temperature of the wavelength optical circulator can be limited, the stability of the system can be maintained, and the optical filter can be used for selecting the optical signal in a specific frequency range, filtering other frequency components can be filtered, the signal to noise ratio of the system can be improved, the anti-interference performance and the selectivity of the system can be improved, and the nonlinear effect in the system can be avoided by adjusting the power density of the input optical power, and the nonlinear effect in the system can be prevented from being influenced by the saturation performance of the optical system.
It should be noted that the specific content of the dynamic test is as follows:
assuming that the wavelength optical circulator is dynamically tested to understand its performance in the communication system, the dynamic test can be performed by:
example 1: modulating the frequency of the input signal from low frequency to high frequency, and recording the transmittance of the wavelength optical circulator;
example 1: identifying the transmission effect of photons in the annular structure in different communication wavelength ranges, namely determining the optimal working frequency range of the wavelength optical circulator;
step 2: modulating the amplitude of an input signal, simulating the change of the power of an optical signal, and recording the transmission characteristic of a wavelength optical circulator;
example 2: by acquiring nonlinear characteristics of the system under different optical powers, whether the system is saturated or distorted under a high optical power environment of the wavelength optical circulator can be determined;
step 3: modulating the waveform of the input signal, recording the dynamic response of the wavelength optical circulator by using square wave or pulse signals;
example 3: the response speed under different waveform inputs is identified, so that the performance of the wavelength optical circulator in rapid signal switching can be known.
It should be added that, a specific example of calculating the transmission loss of the wavelength optical circulator according to a preset formula is as follows:
Transmission loss (DB) =
Wherein,is the input optical power of the light,is the output optical power, the above formula represents the ratio of the input power to the output power in decibels (dB);
calculating the transmission loss can be achieved by using the formula, taking the logarithm of the ratio of the input power to the output power and multiplying the logarithm by 10, so that the decibel value of the transmission loss can be calculated, and the loss degree of the optical signal in the transmission process in the system can be obtained;
let-down power of wavelength optical circulator10 mW of output power5 mW, the substitution formula is:
transmission loss (DB) =
After calculation, a transmission loss of about-3 DB is obtained, which means that the wavelength optical circulator has lost about 3DB of optical power during transmission; and a negative transmission loss value indicates that the output power of the system is smaller than the input power, which indicates that the system has certain loss, so in practical application, the lower the transmission loss value is, the better the loss is, and the lower the loss can ensure the efficiency and the performance of the system.
In this embodiment, the step S3 of re-connecting the wavelength optical circulator to an input port of a preset light source and measuring the input optical power of the light source injected into the wavelength optical circulator further includes:
S31: based on a preset output port of the wavelength optical circulator, a preset reverse optical signal is introduced into the output port;
s32: judging whether the output intensity of the reverse optical signal exceeds the preset bearing intensity of the wavelength optical circulator or not;
s33: if yes, limiting the maximum output intensity of the reverse optical signal to the wavelength optical circulator, rotationally measuring the polarization state of the wavelength optical circulator by applying preset polarization content, recording at least two response parameters of the wavelength optical circulator in each polarization state, and obtaining a response average value from the response parameters.
In this embodiment, the system introduces a preset reverse optical signal into an output port based on a preset output port of the wavelength optical circulator, and then the system judges whether the output intensity of the reverse optical signal exceeds a preset bearing intensity of the wavelength optical circulator, so as to execute a corresponding step; for example, when the system determines that the output intensity of the reverse optical signal does not exceed the preset bearing intensity of the wavelength optical circulator, the system considers that the wavelength optical circulator is in a normal working range, the intensity of the reverse optical signal does not reach a level which can cause damage or nonlinear effect, the system can ensure that the system is in a stable working state under all working conditions by periodically monitoring and analyzing the nonlinear effect, and simultaneously, the system performance is optimized by adjusting the input optical power, optimizing the coupling efficiency or adjusting the system elements, and periodically performing system maintenance and monitoring to ensure that the performance of each optical component of the system is stable and prevent potential problems; for example, when the system determines that the output intensity of the reverse optical signal exceeds the preset bearing intensity of the wavelength optical circulator, the system considers that the intensity of the reverse optical signal reaches the level which may cause damage or nonlinear effect, the system limits the maximum outputtable intensity of the reverse optical signal to the wavelength optical circulator, applies preset polarization content to rotationally measure the polarization states of the wavelength optical circulator, records at least two or more response parameters of the wavelength optical circulator in each polarization state, obtains a response average value from the response parameters, and can prevent the system from being influenced by excessive light intensity by limiting the maximum output intensity of the reverse optical signal, reduce the possibility of nonlinear effect, help to maintain the stability of the wavelength optical circulator, prevent the adverse effect of excessive light intensity on the system performance and service life, and simultaneously ensure that the system has good response to the optical signals in different polarization states by rotationally measuring the polarization states, and obtain the response average value to help to reduce the measurement error, improve the reliability of data, and make the measurement strategy critical to the wavelength optical circulator and the accurate and the adjustment of the measurement strategy.
In this embodiment, before the step S3 of modulating the signal parameter of the wavelength optical circulator by applying the preset dynamic test, the method further includes:
s301: identifying a power level of the light source;
s302: judging whether the power level exceeds the bearing range of a preset optical element or not;
s303: if yes, calibrating the power threshold of the optical element, detecting the loss parameter of the optical element, and acquiring the nonlinear effect threshold of the optical element based on the loss parameter, wherein the loss parameter specifically comprises optical loss, transmittance and refractive index.
In this embodiment, the system identifies the power level of the light source, and then the system determines whether the power level of the light source exceeds the tolerance range of the optical element set in advance, so as to execute the corresponding steps; for example, when the system determines that the power level of the light source does not exceed the bearing range of the optical element, the system considers that the optical element is in the normal operation range and is not affected by excessive light intensity, the system can ensure that the optical element is not potentially damaged by periodically checking the state of the optical element, maintain the stability of the system, periodically monitor and analyze nonlinear effects, ensure that the system is in a stable working state under all working conditions, and check other components of the optical system to ensure that the optical element is also in the normal operation state so as to prevent potential problems; for example, when the system determines that the power level of the light source exceeds the bearing range of the optical element, the system considers that the optical element is affected by too high light intensity, the system performs calibration on the power threshold of the optical element, detects loss parameters of the optical element, obtains nonlinear effect thresholds of the optical element based on the loss parameters, determines the maximum light power which can be borne by the optical element through the power threshold calibration, helps to ensure that a user cannot exceed the power bearing range of the optical element in actual test operation, prevents potential damage and reduces the reliability of the system, and simultaneously detects loss parameters of the optical element, such as light loss, transmittance and refractive index, can obtain the nonlinear effect thresholds of the optical element, namely, nonlinear effects possibly caused when the light power exceeds the threshold, helps to determine the working range of the system, prevents the nonlinear effect from negatively affecting the performance of the system, guides reasonable setting of the system parameters, and helps to prevent potential damage of the optical element when knowing the power threshold and the loss parameters of the optical element, and improves the service life of the wavelength optical circulator.
In this embodiment, the step S5 of dispersing the input optical power into a preset mode area and reducing the power density of the input optical power according to the mode area further includes:
s51: acquiring initial wavelength data of the light source based on a preset monitoring device, and identifying wavelength drift frequency from the initial wavelength data;
s52: judging whether the wavelength drift frequency is larger than a preset frequency or not;
s53: if yes, recalibrating the light source and the pre-recorded standard wavelength, detecting the arrangement direction of a preset optical element, and limiting the use authority of the optical element in a preset time period at regular time.
In this embodiment, the system acquires initial wavelength data of the light source based on a preset monitoring device, identifies wavelength drift frequencies from the initial wavelength data, and then determines whether the wavelength drift frequencies are greater than a preset frequency to execute a corresponding step; for example, when the system determines that the wavelength drift frequency of the light source is not greater than the preset frequency, the system considers that the wavelength variation of the light source is within an acceptable range of the system and does not exceed the expected frequency variation, and the system periodically checks and records the wavelength drift of the light source to ensure the stability of the system in long-term operation, and simultaneously introduces an automatic calibration mechanism and recommends the use of a more stable light source in subsequent tests to reduce the influence of the wavelength drift and maintain a stable working environment and prevent the influence of the temperature variation on the wavelength of the light source; for example, when the system determines that the wavelength drift frequency of the light source is greater than a preset frequency, the system considers that the wavelength variation of the light source exceeds an expected frequency variation, the system recalibrates the light source and a preset standard wavelength, detects the arrangement direction of the preset optical element, limits the use authority of the optical element within a preset time period, reduces the influence of the wavelength drift by recalibrating the light source and the preset standard wavelength, helps to ensure that the wavelength output by the light source meets the system requirement, and simultaneously checks the positions of the optical element at regular time, especially the elements which can influence the wavelength, such as lenses or gratings, and adjusts the positions to ensure that the propagation of the light is not negatively influenced, ensures that the correct arrangement of the optical element helps to maximize the performance of the optical system, improves the coupling efficiency of the light path, and can prolong the service life of the optical element by limiting the use authority regularly, helps to prevent the excessive use of the device or the performance degradation possibly caused by long-time operation, so that if a certain optical element shows unstable characteristics, the damaged or aged element needs to be replaced with a more stable element, and the system is recommended to improve the long-term performance.
In this embodiment, in step S2 of determining whether the reference power value has a preset fluctuation, the method further includes:
s21: acquiring periodic characteristic parameters of the reference power value, wherein the periodic characteristic parameters specifically comprise amplitude, period length and waveform shape;
s22: judging whether the periodic characteristic parameters can present preset specific content or not, wherein the specific content is specifically a specific pattern which can be identified or repeated and is presented in preset time;
s23: if not, detecting the setting parameters of the light source, introducing a preset voltage stabilizer to optimize the power supply noise of the light source based on the setting parameters, and matching the periodic fluctuation of the light source with a preset experimental frequency by applying preset frequency tuning, wherein the setting parameters specifically comprise the stability of the light source, the power supply and the mechanical vibration.
In this embodiment, the system acquires periodic feature parameters of the reference power value, and then the system determines whether the periodic feature parameters can present preset specific contents to execute corresponding steps; for example, when the system determines whether the periodic characteristic parameter to the reference power value can exhibit a specific content set in advance, to execute the corresponding step; for example, when the system determines that the periodic characteristic parameters of the reference power values can present a preset specific identifiable or repeatable mode, the system considers that the output content of the wavelength optical circulator has certain periodic behavior or change, and the system monitors and records the periodic characteristic parameters periodically so as to better understand the change trend and possible influence of the periodic characteristic parameters, and simultaneously suggests users to improve, such as adjusting the position of the components, improving isolation measures and optimizing the control system so as to reduce the influence of the periodic behavior; for example, when the system determines that the periodic characteristic parameter of the reference power value cannot present a preset identifiable or repeatable specific mode, the system considers that the output content of the wavelength optical circulator does not have periodic behavior or change, the system detects setting parameters of the light source, introduces preset voltage stabilizer to optimize power supply noise of the light source based on the setting parameters, matches the periodic fluctuation of the light source with preset experimental frequency by using preset frequency tuning, reduces the fluctuation of the light source output by detecting and adjusting the stability of the light source, optimizes the stability of the light source to help ensure the accuracy of experiments and measurement, simultaneously effectively reduces the power supply noise of the light source by the voltage stabilizer, improves the purity of the output signal, reduces noise to help improve the quality of experimental signals in applications sensitive to the power supply noise, particularly in the measurement requiring high signal-to-noise ratio, reduces the interference of vibration to the light source by detecting and adjusting the mechanical vibration parameter, improves the accuracy of the system, and is not easy to think in experiments requiring accurate control of the frequency, helps to reduce the repeatability of the experiment by ensuring the matching of the periodic fluctuation of the light source with the experimental frequency.
It should be noted that, a specific example of matching the periodic fluctuation of the light source with the preset experimental frequency by applying the preset frequency tuning is as follows:
assuming an experiment system uses a laser as a light source, the output frequency of the laser has periodic fluctuation, and the experiment needs to be performed at a specific frequency, so that the frequency of the laser needs to be adjusted to match the experiment frequency;
firstly, introducing a frequency-adjustable voltage stabilizer, setting the frequency of the frequency-adjustable voltage stabilizer as the frequency of an adjustable laser, then detecting the periodic fluctuation of the output of the laser by using a spectrometer, determining the frequency of the periodic fluctuation, performing frequency tuning on the laser by using the frequency-adjustable voltage stabilizer through presetting the frequency required by experiments, for example, setting the frequency to be a specific laser resonance frequency, fine tuning the frequency to ensure that the periodic fluctuation of the laser is matched with the preset experiment frequency, and finally detecting the fluctuation of the output of the laser again by using the spectrometer, verifying the frequency tuning effect and ensuring that the frequency of the laser is matched with the experiment frequency;
through the tuning process, the frequency of periodic fluctuation can be perfectly matched with the frequency required by the experiment, and the precision and the repeatability of the experiment can be improved.
In this embodiment, in step S4 of determining whether a preset nonlinear effect exists in the nonlinear response data, the method further includes:
s41: performing linear fitting on the nonlinear response data by using preset linear regression to generate a residual value corresponding to the linear fitting, wherein the residual value is specifically the difference between an observed value and a fitting value;
s42: judging whether the residual error value shows a preset trend or not;
s43: if yes, a data scatter diagram of the nonlinear response data is drawn, nonlinear shapes formed on the data scatter diagram are identified, and trend change information in the data scatter diagram is analyzed according to the nonlinear shapes and the response curve, wherein the trend change information specifically comprises exponential growth and saturation trend.
In this embodiment, the system applies a preset linear regression to perform linear fitting on the nonlinear response data, generates a residual value corresponding to the linear fitting, and then the system judges whether the residual value presents a preset trend or not so as to execute a corresponding step; for example, when the system determines that the residual value of the linear fitting does not exhibit a preset trend, the system considers that nonlinear effects may not exist in nonlinear response data, and analyzes the residual of the linear fitting to ensure that the residual accords with a normal distribution, a mean value is zero and a linear regression basic assumption with constant variance, and simultaneously performs proper transformation on variables, including logarithmic transformation and square root transformation, so as to better satisfy the linear assumption, and checks the fitting degree of a fitting curve and actual data to determine whether the fitting has statistical significance; for example, when the system determines that the residual value of the linear fitting presents a preset trend, the system considers that a nonlinear effect exists in nonlinear response data, the system draws a data scatter diagram of the nonlinear response data, identifies the nonlinear shape formed on the data scatter diagram, analyzes trend change information of the data scatter diagram according to the nonlinear shape and the response curve, intuitively presents distribution characteristics of the nonlinear response data through the data scatter diagram, enables a user to clearly observe the nonlinear shape, such as curve, exponential growth or saturation trend, simultaneously enables the trend change information to guide experimental test design of the user, ensures more pertinence of data acquisition and analysis processes, purposefully adjusts experimental parameters according to the trend information to capture characteristics of the data more comprehensively, improves experimental efficiency, and enables the user to identify the trend change information to help to know dynamic characteristics of the data in advance, and to help to formulate proper analysis and coping strategies for cognition of the trend.
In this embodiment, when the wavelength optical circulator is in no-light signal injection, the step S1 of recording at least two reference power values of the output ports corresponding to the wavelength optical circulator further includes:
s11: simultaneously measuring a preset signal and a reference signal by adopting preset differential mode measurement, and obtaining common mode interference data in the preset signal and the reference signal;
s12: judging whether the common mode interference data are derived from the same kind of noise;
s13: if yes, calculating the difference between the preset signal and the reference signal, generating a corresponding differential signal, and carrying out balance processing on the differential signal by using a preset differential mode amplifier to counteract common mode noise of the differential signal.
In this embodiment, the system measures the preset signal content and the preset reference signal content simultaneously by using the preset differential mode measurement, acquires common mode interference data in the signal content and the reference signal content, and then the system judges whether the common mode interference data originate from the same kind of noise in the test environment so as to execute corresponding steps; for example, when the system determines that the common mode interference data in the signal content and the reference signal content do not originate from the same kind of noise in the test environment, then the system will consider that there are multiple kinds of additional interference sources or interference mechanisms in the test environment, the system will ensure that the devices are properly connected, the cables are not damaged, and the devices are well grounded by detecting the devices and the cables are not damaged, because electromagnetic coupling between the devices may cause common mode interference at some time, while shielding devices are used on the devices or signal lines that may be interfered by external electromagnetic radiation to reduce the influence of external interference on the test system, and perform spectrum analysis to determine the frequency range of the common mode interference, because the interference sources can be more accurately positioned by identifying frequency characteristics at some time; for example, when the system determines that common-mode interference data in the signal content and the reference signal content originate from the same kind of noise in the test environment, the system considers that a single kind or multiple kinds of interference sources and interference mechanisms exist in the test environment, the system generates corresponding differential signals by calculating the difference between the signal content and the reference signal content, and applies a preset differential mode amplifier to perform balanced processing on the differential signals so as to offset common-mode noise of the differential signals, and by calculating the difference between the preset signal and the reference signal, the differential mode amplifier can perform balanced processing on the common-mode noise so as to offset the common-mode noise, which is crucial for improving the signal-to-noise ratio between the signal and the noise.
It should be noted that a signal is the main signal of interest to be measured, which represents the signal to be measured in the system, whereas the phase and amplitude of the signal may change over time, but at any given instant, both are known; the reference signal is a signal opposite in phase to the signal, its amplitude being equal to the signal, and the reference signal is intended to cancel common mode noise in the signal, so that the phase of the reference signal is always 180 degrees opposite to the signal phase, and its amplitude is equal; the differential signal is the difference between the signal and the reference signal, i.e. the differential signal=signal-reference signal, and the differential signal contains the main information of the signal, but since the reference signal is the opposite of the signal, the common mode noise can be cancelled in the differential signal, and the differential signal is amplified by the differential mode amplifier, and by amplifying the two signals, the sensitivity of the measurement system to the differential signal can be improved;
in summary, the signal and the reference signal in differential mode measurement generally refer to two signals with opposite phases and equal amplitudes, and are mainly used for improving the suppression of common mode noise, so that the measurement is more accurate and reliable.
Referring to fig. 2, a loss level inspection system for a wavelength circulator according to an embodiment of the invention includes:
A recording module 10, configured to record at least two reference power values of corresponding output ports of the wavelength optical circulator when no light signal is injected into the wavelength optical circulator;
a judging module 20, configured to judge whether a preset fluctuation exists in the reference power value;
the execution module 30 is configured to re-connect the wavelength optical circulator to an input port of a preset light source if not, measure an input optical power of the light source injected into the wavelength optical circulator, apply a preset dynamic test to modulate a signal parameter of the wavelength optical circulator, record a response curve of the dynamic test to the wavelength optical circulator, and generate nonlinear response data of the input optical power, where the signal parameter specifically includes a signal frequency, a signal amplitude and a signal waveform;
a second judging module 40, configured to judge whether a preset nonlinear effect exists in the nonlinear response data, where the nonlinear effect specifically includes frequency multiplication and frequency mixing;
and the second execution module 50 is configured to detect end surface information of a preset optical fiber if the input optical power is detected, limit the working temperature of the wavelength optical circulator, apply a preset optical filter to limit an optical signal within a preset frequency range, disperse the input optical power into a preset mode area, reduce the power density of the input optical power according to the mode area, and calculate the transmission loss of the wavelength optical circulator according to a preset formula.
In this embodiment, the recording module 10 records at least two reference power values output by the wavelength optical circulator corresponding to the output port based on the situation that the wavelength optical circulator is in no light signal injection, and then the judging module 20 judges whether the reference power values have preset fluctuation conditions or not so as to execute corresponding steps; for example, when the system determines that there is a preset fluctuation in these reference power values output by the output port of the wavelength optical circulator, the system considers that the optical system of the wavelength optical circulator has a change or instability in some aspects, possibly caused by factors of environmental conditions, fluctuation of light sources and state change of optical elements, and the system helps to trace back the cause of fluctuation by checking parameters such as temperature and humidity for recording the environmental conditions, which might be related to the change of the environmental conditions, by recording these parameters to know whether there is an influence related to the environment, and simultaneously implementing dynamic monitoring, observing real-time change of the reference power values during experiments or system operation, the dynamic monitoring can reveal fluctuation related to actual operation or signal modulation, and recording any abnormal events such as power supply change, device switch or temperature fluctuation which might cause fluctuation of the reference power values; for example, when the system determines that there is no preset fluctuation in the reference power values output by the output port of the wavelength optical circulator, the execution module 30 considers that there is no change or instability in the optical system of the wavelength optical circulator, the system re-connects the pre-disconnected wavelength optical circulator to the input port corresponding to the preset light source, measures the input optical power when the light source is injected into the wavelength optical circulator, applies the preset signal parameters of the dynamic test modulation wavelength optical circulator, records the response curve of the dynamic test to the wavelength optical circulator, generates nonlinear response data of the input optical power, measures the nonlinear response data of the input optical power, can evaluate the performance of the wavelength optical circulator more comprehensively to understand the response of different input optical powers, is helpful for determining the working range and performance limit of the wavelength optical circulator, and simultaneously records the response curve of the dynamic test to the wavelength optical circulator, is helpful for revealing the dynamic behavior of the system under different signal conditions, is critical for real-time application and debugging, can be used for verifying whether the system accords with expected performance, and the nonlinear response data provides improved nonlinear response data, and the nonlinear response data can optimize the design of the coupling efficiency and the nonlinear response time of the system; the second judging module 40 judges whether the nonlinear response data of the input optical power has a nonlinear effect preset so as to execute a corresponding step; for example, when the system determines that there is no pre-set nonlinear effect on the nonlinear response data of the input optical power, the system considers that the linear response is exhibited under the current test condition, possibly because the change of the input optical power does not reach the threshold value of the obvious nonlinear effect generated by the system, the system can test by increasing the change range of the input optical power or changing the wavelength of the light source, and the nonlinear effect can only appear under the specific condition, and meanwhile, the resolution of the measuring system is increased to more finely detect the possible nonlinear response, and the performances of the light source, the detector and other optical elements are verified, so that the states of the optical system and the measuring device can be confirmed to work according to the expectations; for example, when the system determines that there is a preset nonlinear effect on the nonlinear response data of the input optical power, the second execution module 50 considers that a nonlinear effect appears under the current test condition, the system can limit the working temperature of the wavelength optical circulator by detecting the end surface information of the preset optical fiber, limit the optical signal in the preset frequency range by applying the preset optical filter, disperse the input optical power into a preset mode area, reduce the power density of the input optical power according to the content of the mode area, and finally calculate the transmission loss of the wavelength optical circulator according to the preset formula, by detecting the end surface information of the preset optical fiber, the quality and stability of the optical fiber connection can be ensured, which is beneficial to reducing the loss and distortion of the optical signal in the transmission process, and simultaneously, by limiting the working temperature of the wavelength optical circulator, the stability of the system can be maintained, and the optical filter can be used for selecting the optical signal in a specific frequency range, filtering other frequency components, which is beneficial to optimizing the signal and noise ratio of the system, improving the anti-interference performance and selectivity of the system, and not easy to thinking that the power density of the input optical power can be adjusted, the quality and the stability of the optical fiber connection can be improved, the quality and the stability of the optical fiber can be improved, the system can be beneficial to the performance of the nonlinear effect in the system can be maintained, and the nonlinear effect can be avoided.
In this embodiment, the execution module further includes:
the introducing unit is used for introducing a preset reverse optical signal to the output port based on the preset output port of the wavelength optical circulator;
the judging unit is used for judging whether the output intensity of the reverse optical signal exceeds the preset bearing intensity of the wavelength optical circulator;
and the execution unit is used for limiting the maximum output intensity of the reverse optical signal to the wavelength optical circulator if the reverse optical signal is positive, applying preset polarization content to rotate and measure the polarization state of the wavelength optical circulator, recording at least two response parameters of the wavelength optical circulator in each polarization state, and obtaining a response average value from the response parameters.
In this embodiment, the system introduces a preset reverse optical signal into an output port based on a preset output port of the wavelength optical circulator, and then the system judges whether the output intensity of the reverse optical signal exceeds a preset bearing intensity of the wavelength optical circulator, so as to execute a corresponding step; for example, when the system determines that the output intensity of the reverse optical signal does not exceed the preset bearing intensity of the wavelength optical circulator, the system considers that the wavelength optical circulator is in a normal working range, the intensity of the reverse optical signal does not reach a level which can cause damage or nonlinear effect, the system can ensure that the system is in a stable working state under all working conditions by periodically monitoring and analyzing the nonlinear effect, and simultaneously, the system performance is optimized by adjusting the input optical power, optimizing the coupling efficiency or adjusting the system elements, and periodically performing system maintenance and monitoring to ensure that the performance of each optical component of the system is stable and prevent potential problems; for example, when the system determines that the output intensity of the reverse optical signal exceeds the preset bearing intensity of the wavelength optical circulator, the system considers that the intensity of the reverse optical signal reaches the level which may cause damage or nonlinear effect, the system limits the maximum outputtable intensity of the reverse optical signal to the wavelength optical circulator, applies preset polarization content to rotationally measure the polarization states of the wavelength optical circulator, records at least two or more response parameters of the wavelength optical circulator in each polarization state, obtains a response average value from the response parameters, and can prevent the system from being influenced by excessive light intensity by limiting the maximum output intensity of the reverse optical signal, reduce the possibility of nonlinear effect, help to maintain the stability of the wavelength optical circulator, prevent the adverse effect of excessive light intensity on the system performance and service life, and simultaneously ensure that the system has good response to the optical signals in different polarization states by rotationally measuring the polarization states, and obtain the response average value to help to reduce the measurement error, improve the reliability of data, and make the measurement strategy critical to the wavelength optical circulator and the accurate and the adjustment of the measurement strategy.
In this embodiment, further comprising:
an identification module for identifying a power level of the light source;
a third judging module for judging whether the power level exceeds the bearing range of the preset optical element;
and the third execution module is used for calibrating the power threshold of the optical element if the power threshold is met, detecting the loss parameter of the optical element, and acquiring the nonlinear effect threshold of the optical element based on the loss parameter, wherein the loss parameter specifically comprises optical loss, transmittance and refractive index.
In this embodiment, the system identifies the power level of the light source, and then the system determines whether the power level of the light source exceeds the tolerance range of the optical element set in advance, so as to execute the corresponding steps; for example, when the system determines that the power level of the light source does not exceed the bearing range of the optical element, the system considers that the optical element is in the normal operation range and is not affected by excessive light intensity, the system can ensure that the optical element is not potentially damaged by periodically checking the state of the optical element, maintain the stability of the system, periodically monitor and analyze nonlinear effects, ensure that the system is in a stable working state under all working conditions, and check other components of the optical system to ensure that the optical element is also in the normal operation state so as to prevent potential problems; for example, when the system determines that the power level of the light source exceeds the bearing range of the optical element, the system considers that the optical element is affected by too high light intensity, the system performs calibration on the power threshold of the optical element, detects loss parameters of the optical element, obtains nonlinear effect thresholds of the optical element based on the loss parameters, determines the maximum light power which can be borne by the optical element through the power threshold calibration, helps to ensure that a user cannot exceed the power bearing range of the optical element in actual test operation, prevents potential damage and reduces the reliability of the system, and simultaneously detects loss parameters of the optical element, such as light loss, transmittance and refractive index, can obtain the nonlinear effect thresholds of the optical element, namely, nonlinear effects possibly caused when the light power exceeds the threshold, helps to determine the working range of the system, prevents the nonlinear effect from negatively affecting the performance of the system, guides reasonable setting of the system parameters, and helps to prevent potential damage of the optical element when knowing the power threshold and the loss parameters of the optical element, and improves the service life of the wavelength optical circulator.
In this embodiment, the second execution module further includes:
the identification unit is used for acquiring initial wavelength data of the light source based on preset monitoring equipment and identifying wavelength drift frequency from the initial wavelength data;
the second judging unit is used for judging whether the wavelength drift frequency is larger than a preset frequency or not;
and the second execution unit is used for recalibrating the light source and the pre-recorded standard wavelength if the light source and the pre-recorded standard wavelength are used, detecting the arrangement direction of the preset optical element, and limiting the use authority of the optical element in a preset time period at fixed time.
In this embodiment, the system acquires initial wavelength data of the light source based on a preset monitoring device, identifies wavelength drift frequencies from the initial wavelength data, and then determines whether the wavelength drift frequencies are greater than a preset frequency to execute a corresponding step; for example, when the system determines that the wavelength drift frequency of the light source is not greater than the preset frequency, the system considers that the wavelength variation of the light source is within an acceptable range of the system and does not exceed the expected frequency variation, and the system periodically checks and records the wavelength drift of the light source to ensure the stability of the system in long-term operation, and simultaneously introduces an automatic calibration mechanism and recommends the use of a more stable light source in subsequent tests to reduce the influence of the wavelength drift and maintain a stable working environment and prevent the influence of the temperature variation on the wavelength of the light source; for example, when the system determines that the wavelength drift frequency of the light source is greater than a preset frequency, the system considers that the wavelength variation of the light source exceeds an expected frequency variation, the system recalibrates the light source and a preset standard wavelength, detects the arrangement direction of the preset optical element, limits the use authority of the optical element within a preset time period, reduces the influence of the wavelength drift by recalibrating the light source and the preset standard wavelength, helps to ensure that the wavelength output by the light source meets the system requirement, and simultaneously checks the positions of the optical element at regular time, especially the elements which can influence the wavelength, such as lenses or gratings, and adjusts the positions to ensure that the propagation of the light is not negatively influenced, ensures that the correct arrangement of the optical element helps to maximize the performance of the optical system, improves the coupling efficiency of the light path, and can prolong the service life of the optical element by limiting the use authority regularly, helps to prevent the excessive use of the device or the performance degradation possibly caused by long-time operation, so that if a certain optical element shows unstable characteristics, the damaged or aged element needs to be replaced with a more stable element, and the system is recommended to improve the long-term performance.
In this embodiment, the judging module further includes:
an acquisition unit, configured to acquire a periodic characteristic parameter of the reference power value, where the periodic characteristic parameter specifically includes an amplitude, a period length, and a waveform shape;
the third judging unit is used for judging whether the periodic characteristic parameter can present preset specific content, wherein the specific content is specifically a recognizable or repeated specific mode presented in preset time;
and the third execution unit is used for detecting the setting parameters of the light source if not, introducing a preset voltage stabilizer to optimize the power supply noise of the light source based on the setting parameters, and matching the periodic fluctuation of the light source with a preset experimental frequency by applying preset frequency tuning, wherein the setting parameters specifically comprise the stability of the light source, the power supply and the mechanical vibration.
In this embodiment, the system acquires periodic feature parameters of the reference power value, and then the system determines whether the periodic feature parameters can present preset specific contents to execute corresponding steps; for example, when the system determines whether the periodic characteristic parameter to the reference power value can exhibit a specific content set in advance, to execute the corresponding step; for example, when the system determines that the periodic characteristic parameters of the reference power values can present a preset specific identifiable or repeatable mode, the system considers that the output content of the wavelength optical circulator has certain periodic behavior or change, and the system monitors and records the periodic characteristic parameters periodically so as to better understand the change trend and possible influence of the periodic characteristic parameters, and simultaneously suggests users to improve, such as adjusting the position of the components, improving isolation measures and optimizing the control system so as to reduce the influence of the periodic behavior; for example, when the system determines that the periodic characteristic parameter of the reference power value cannot present a preset identifiable or repeatable specific mode, the system considers that the output content of the wavelength optical circulator does not have periodic behavior or change, the system detects setting parameters of the light source, introduces preset voltage stabilizer to optimize power supply noise of the light source based on the setting parameters, matches the periodic fluctuation of the light source with preset experimental frequency by using preset frequency tuning, reduces the fluctuation of the light source output by detecting and adjusting the stability of the light source, optimizes the stability of the light source to help ensure the accuracy of experiments and measurement, simultaneously effectively reduces the power supply noise of the light source by the voltage stabilizer, improves the purity of the output signal, reduces noise to help improve the quality of experimental signals in applications sensitive to the power supply noise, particularly in the measurement requiring high signal-to-noise ratio, reduces the interference of vibration to the light source by detecting and adjusting the mechanical vibration parameter, improves the accuracy of the system, and is not easy to think in experiments requiring accurate control of the frequency, helps to reduce the repeatability of the experiment by ensuring the matching of the periodic fluctuation of the light source with the experimental frequency.
In this embodiment, the second judging module further includes:
the generating unit is used for carrying out linear fitting on the nonlinear response data by applying preset linear regression to generate a residual value corresponding to the linear fitting, wherein the residual value is specifically the difference between an observed value and a fitting value;
a fourth judging unit, configured to judge whether the residual error value exhibits a preset trend;
and the fourth execution unit is used for drawing a data scatter diagram of the nonlinear response data if the data scatter diagram is positive, identifying a nonlinear shape formed on the data scatter diagram, and analyzing trend change information in the data scatter diagram according to the nonlinear shape and the response curve, wherein the trend change information specifically comprises an exponential growth trend and a saturation trend.
In this embodiment, the system applies a preset linear regression to perform linear fitting on the nonlinear response data, generates a residual value corresponding to the linear fitting, and then the system judges whether the residual value presents a preset trend or not so as to execute a corresponding step; for example, when the system determines that the residual value of the linear fitting does not exhibit a preset trend, the system considers that nonlinear effects may not exist in nonlinear response data, and analyzes the residual of the linear fitting to ensure that the residual accords with a normal distribution, a mean value is zero and a linear regression basic assumption with constant variance, and simultaneously performs proper transformation on variables, including logarithmic transformation and square root transformation, so as to better satisfy the linear assumption, and checks the fitting degree of a fitting curve and actual data to determine whether the fitting has statistical significance; for example, when the system determines that the residual value of the linear fitting presents a preset trend, the system considers that a nonlinear effect exists in nonlinear response data, the system draws a data scatter diagram of the nonlinear response data, identifies the nonlinear shape formed on the data scatter diagram, analyzes trend change information of the data scatter diagram according to the nonlinear shape and the response curve, intuitively presents distribution characteristics of the nonlinear response data through the data scatter diagram, enables a user to clearly observe the nonlinear shape, such as curve, exponential growth or saturation trend, simultaneously enables the trend change information to guide experimental test design of the user, ensures more pertinence of data acquisition and analysis processes, purposefully adjusts experimental parameters according to the trend information to capture characteristics of the data more comprehensively, improves experimental efficiency, and enables the user to identify the trend change information to help to know dynamic characteristics of the data in advance, and to help to formulate proper analysis and coping strategies for cognition of the trend.
In this embodiment, the recording module further includes:
the second acquisition unit is used for simultaneously measuring a preset signal and a reference signal by adopting preset differential mode measurement and acquiring common mode interference data in the preset signal and the reference signal;
a fifth judging unit configured to judge whether the common mode interference data originates from the same kind of noise;
and the fifth execution unit is used for calculating the difference between the preset signal and the reference signal if yes, generating a corresponding differential signal, and carrying out balance processing on the differential signal by using a preset differential mode amplifier to counteract common mode noise of the differential signal.
In this embodiment, the system measures the preset signal content and the preset reference signal content simultaneously by using the preset differential mode measurement, acquires common mode interference data in the signal content and the reference signal content, and then the system judges whether the common mode interference data originate from the same kind of noise in the test environment so as to execute corresponding steps; for example, when the system determines that the common mode interference data in the signal content and the reference signal content do not originate from the same kind of noise in the test environment, then the system will consider that there are multiple kinds of additional interference sources or interference mechanisms in the test environment, the system will ensure that the devices are properly connected, the cables are not damaged, and the devices are well grounded by detecting the devices and the cables are not damaged, because electromagnetic coupling between the devices may cause common mode interference at some time, while shielding devices are used on the devices or signal lines that may be interfered by external electromagnetic radiation to reduce the influence of external interference on the test system, and perform spectrum analysis to determine the frequency range of the common mode interference, because the interference sources can be more accurately positioned by identifying frequency characteristics at some time; for example, when the system determines that common-mode interference data in the signal content and the reference signal content originate from the same kind of noise in the test environment, the system considers that a single kind or multiple kinds of interference sources and interference mechanisms exist in the test environment, the system generates corresponding differential signals by calculating the difference between the signal content and the reference signal content, and applies a preset differential mode amplifier to perform balanced processing on the differential signals so as to offset common-mode noise of the differential signals, and by calculating the difference between the preset signal and the reference signal, the differential mode amplifier can perform balanced processing on the common-mode noise so as to offset the common-mode noise, which is crucial for improving the signal-to-noise ratio between the signal and the noise.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. The loss level inspection method of the wavelength optical circulator is characterized by comprising the following steps of:
recording at least two reference power values of corresponding output ports of the wavelength optical circulator when no light signal is injected into the wavelength optical circulator;
judging whether the reference power value has preset fluctuation or not;
if not, re-accessing the wavelength optical circulator to an input port of a preset light source, measuring the input light power of the light source injected into the wavelength optical circulator, applying a preset dynamic test to modulate signal parameters of the wavelength optical circulator, recording a response curve of the dynamic test to the wavelength optical circulator, and generating nonlinear response data of the input light power, wherein the signal parameters comprise signal frequency, signal amplitude and signal waveform;
judging whether a preset nonlinear effect exists in the nonlinear response data, wherein the nonlinear effect specifically comprises frequency multiplication and frequency mixing;
If yes, detecting end face information of a preset optical fiber, limiting the working temperature of the wavelength optical circulator, limiting an optical signal in a preset frequency range by using a preset optical filter, dispersing the input optical power into a preset mode area, reducing the power density of the input optical power according to the mode area, and calculating the transmission loss of the wavelength optical circulator according to a preset formula;
the step of dispersing the input optical power into a preset mode area and reducing the power density of the input optical power according to the mode area further comprises the steps of:
acquiring initial wavelength data of the light source based on a preset monitoring device, and identifying wavelength drift frequency from the initial wavelength data;
judging whether the wavelength drift frequency is larger than a preset frequency or not;
if yes, recalibrating the light source and the pre-recorded standard wavelength, detecting the arrangement direction of a preset optical element, and limiting the use authority of the optical element in a preset time period at regular time.
2. The method for horizontally inspecting the loss of a wavelength optical circulator according to claim 1, wherein the step of re-connecting the wavelength optical circulator to an input port of a predetermined light source and measuring the input optical power of the light source injected into the wavelength optical circulator further comprises:
Based on a preset output port of the wavelength optical circulator, a preset reverse optical signal is introduced into the output port;
judging whether the output intensity of the reverse optical signal exceeds the preset bearing intensity of the wavelength optical circulator or not;
if yes, limiting the maximum output intensity of the reverse optical signal to the wavelength optical circulator, rotationally measuring the polarization state of the wavelength optical circulator by applying preset polarization content, recording at least two response parameters of the wavelength optical circulator in each polarization state, and obtaining a response average value from the response parameters.
3. The method for horizontally inspecting the loss of a wavelength optical circulator according to claim 1, further comprising, before the step of modulating the signal parameters of the wavelength optical circulator by applying a predetermined dynamic test:
identifying a power level of the light source;
judging whether the power level exceeds the bearing range of a preset optical element or not;
if yes, calibrating the power threshold of the optical element, detecting the loss parameter of the optical element, and acquiring the nonlinear effect threshold of the optical element based on the loss parameter, wherein the loss parameter specifically comprises optical loss, transmittance and refractive index.
4. The method for horizontally inspecting the loss of a wavelength optical circulator according to claim 1, wherein the step of determining whether the reference power value has a preset fluctuation further comprises:
acquiring periodic characteristic parameters of the reference power value, wherein the periodic characteristic parameters specifically comprise amplitude, period length and waveform shape;
judging whether the periodic characteristic parameters can present preset specific content or not, wherein the specific content is specifically a specific pattern which can be identified or repeated and is presented in preset time;
if not, detecting the setting parameters of the light source, introducing a preset voltage stabilizer to optimize the power supply noise of the light source based on the setting parameters, and matching the periodic fluctuation of the light source with a preset experimental frequency by applying preset frequency tuning, wherein the setting parameters specifically comprise the stability of the light source, the power supply and the mechanical vibration.
5. The method for inspecting the loss level of a wavelength optical circulator according to claim 1, wherein the step of determining whether a preset nonlinear effect exists in the nonlinear response data further comprises:
performing linear fitting on the nonlinear response data by using preset linear regression to generate a residual value corresponding to the linear fitting, wherein the residual value is specifically the difference between an observed value and a fitting value;
Judging whether the residual error value shows a preset trend or not;
if yes, a data scatter diagram of the nonlinear response data is drawn, nonlinear shapes formed on the data scatter diagram are identified, and trend change information in the data scatter diagram is analyzed according to the nonlinear shapes and the response curve, wherein the trend change information specifically comprises exponential growth and saturation trend.
6. The method for horizontally inspecting the loss of a wavelength optical circulator according to claim 1, wherein the step of recording at least two reference power values of corresponding output ports of the wavelength optical circulator when the wavelength optical circulator is in a no-light signal injection state further comprises:
simultaneously measuring a preset signal and a reference signal by adopting preset differential mode measurement, and obtaining common mode interference data in the preset signal and the reference signal;
judging whether the common mode interference data are derived from the same kind of noise;
if yes, calculating the difference between the preset signal and the reference signal, generating a corresponding differential signal, and carrying out balance processing on the differential signal by using a preset differential mode amplifier to counteract common mode noise of the differential signal.
7. A loss level inspection system for a wavelength light circulator, comprising:
the recording module is used for recording at least two reference power values of the corresponding output port of the wavelength optical circulator based on the fact that the wavelength optical circulator is in the state of no light signal injection;
the judging module is used for judging whether the reference power value has preset fluctuation or not;
the execution module is used for re-accessing the wavelength optical circulator to an input port of a preset light source if not, measuring the input optical power of the light source injected into the wavelength optical circulator, applying a preset dynamic test to modulate signal parameters of the wavelength optical circulator, recording a response curve of the dynamic test to the wavelength optical circulator, and generating nonlinear response data of the input optical power, wherein the signal parameters specifically comprise signal frequency, signal amplitude and signal waveform;
the second judging module is used for judging whether a preset nonlinear effect exists in the nonlinear response data, wherein the nonlinear effect specifically comprises frequency multiplication and frequency mixing;
the second execution module is used for detecting the end face information of the preset optical fiber if the input optical power is detected, limiting the working temperature of the wavelength optical circulator, applying a preset optical filter to limit the optical signal within a preset frequency range, dispersing the input optical power into a preset mode area, reducing the power density of the input optical power according to the mode area, and calculating the transmission loss of the wavelength optical circulator according to a preset formula;
Wherein the second execution module further comprises:
the identification unit is used for acquiring initial wavelength data of the light source based on preset monitoring equipment and identifying wavelength drift frequency from the initial wavelength data;
the second judging unit is used for judging whether the wavelength drift frequency is larger than a preset frequency or not;
and the second execution unit is used for recalibrating the light source and the pre-recorded standard wavelength if the light source and the pre-recorded standard wavelength are used, detecting the arrangement direction of the preset optical element, and limiting the use authority of the optical element in a preset time period at fixed time.
8. The loss level inspection system of a wavelength optical circulator of claim 7, wherein the execution module further comprises:
the introducing unit is used for introducing a preset reverse optical signal to the output port based on the preset output port of the wavelength optical circulator;
the judging unit is used for judging whether the output intensity of the reverse optical signal exceeds the preset bearing intensity of the wavelength optical circulator;
and the execution unit is used for limiting the maximum output intensity of the reverse optical signal to the wavelength optical circulator if the reverse optical signal is positive, applying preset polarization content to rotate and measure the polarization state of the wavelength optical circulator, recording at least two response parameters of the wavelength optical circulator in each polarization state, and obtaining a response average value from the response parameters.
9. The loss level inspection system of a wavelength optical circulator of claim 7, further comprising:
an identification module for identifying a power level of the light source;
a third judging module for judging whether the power level exceeds the bearing range of the preset optical element;
and the third execution module is used for calibrating the power threshold of the optical element if the power threshold is met, detecting the loss parameter of the optical element, and acquiring the nonlinear effect threshold of the optical element based on the loss parameter, wherein the loss parameter specifically comprises optical loss, transmittance and refractive index.
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