CN115711671A - Reconfigurable real-time spectral measurement system and application - Google Patents
Reconfigurable real-time spectral measurement system and application Download PDFInfo
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- CN115711671A CN115711671A CN202211369714.0A CN202211369714A CN115711671A CN 115711671 A CN115711671 A CN 115711671A CN 202211369714 A CN202211369714 A CN 202211369714A CN 115711671 A CN115711671 A CN 115711671A
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Abstract
The application discloses restructural real-time spectral measurement system and application, the system includes: the device comprises a pulse extraction module, a loop control module and a frequency spectrum display module; the pulse extraction module is used for generating a first optical pulse signal and adjusting the repetition frequency of the first optical pulse signal to obtain a second optical pulse signal; the loop control module is used for controlling the dispersion amount in the system, achieving the effect of adjustable system resolution, realizing the mapping of the frequency spectrum of the second optical pulse signal in the time dimension, and obtaining the optical pulse signal to be detected; the frequency spectrum display module is used for carrying out photoelectric conversion on the optical pulse signal to be detected and carrying out real-time monitoring on the time domain waveform of the optical pulse signal to be detected to obtain a monitoring result. The spectrum measurement resolution of the optical pulse signal can be flexibly adjusted according to actual requirements; meanwhile, the frequency spectrum measurement refresh rate of the optical pulse signal can be flexibly controlled according to actual requirements. By using a pattern of loops, the cost and time of building up the dispersive optical fiber is reduced.
Description
Technical Field
The application relates to the technical field of precision instruments, in particular to a reconfigurable real-time spectral measurement system and application.
Background
Conventional spectrum acquisition principles include dispersive and interferometric types. The dispersion type is to obtain a target spectrum by sequentially arranging monochromatic light with dispersed colors according to the wavelength after splitting the polychromatic light by a light splitting element (such as a prism and a grating), has the characteristics of mature technology, stable performance and the like, but limits luminous flux and signal-to-noise ratio because the realization of high spatial resolution and spectral resolution requires a small entrance slit; the interference type utilizes the Fourier transform spectrum characteristic of the double-beam interference to realize the acquisition of spectrum data, has the characteristics of large luminous flux, high wavelength precision and the like, but needs precise and stable moving mirror scanning during working, so that the target spectrum cannot be detected in real time.
Once determined, the spectral resolution, bandwidth range, etc. of the two types of spectrometer systems cannot be changed. In order to meet the requirements of different tasks, high spectral resolution and wide spectral range are required, which leads to the reduction of the signal-to-noise ratio of the system and the sharp increase of the data volume of the spectral image. The reduction of the signal-to-noise ratio can influence the image acquisition quality, the increase of the data volume can occupy larger storage space, meanwhile, the data acquisition and processing time is prolonged, and the real-time performance of the system is influenced.
The frequency-time mapping technique, sometimes referred to as real-time fourier transform, maps the spectral information of the signal to be measured onto the time dimension, so that the time-domain envelope of the output signal is proportional to the spectral shape of the input microwave signal, and then the broadband spectral information of the input signal can be directly read by an oscilloscope. In general, frequency-time mapping is performed by second-order dispersion, and a frequency-to-time mapping process is implemented by using different transmission speeds of light with different frequencies in a dispersion medium.
Disclosure of Invention
The frequency-time mapping technology is utilized to map the frequency spectrum information of the optical pulse signals to the time dimension, and the effect of controlling the resolution ratio of the system and the effect of controlling the refresh rate of the system are achieved by controlling the change of the dispersion amount and the change of the repetition rate of the optical pulse signals.
In order to achieve the aim, the application provides a reconfigurable real-time spectrum measuring system which comprises a pulse extraction module, a loop control module and a spectrum display module;
the pulse extraction module is used for generating a first optical pulse signal and adjusting the repetition frequency of the first optical pulse signal to obtain a second optical pulse signal;
the loop control module is used for controlling the dispersion amount in the system, realizing the mapping of the frequency spectrum of the second optical pulse signal in the time dimension and obtaining the optical pulse signal to be detected;
the frequency spectrum display module is used for performing photoelectric conversion on the optical pulse signal to be detected and monitoring the time domain waveform of the optical pulse signal to be detected in real time to obtain a monitoring result.
Preferably, the pulse extraction module includes: the device comprises a mode locking laser device, a first digital delay generating device and a first acousto-optic modulation device;
the mode locking laser device is used for emitting the first optical pulse signal;
the first acousto-optic modulation device is used for selectively extracting the first optical pulse signal, so that the repetition frequency of the first optical pulse signal is adjusted, and the second optical pulse signal is obtained;
the first digital delay generating device is used for controlling the first acousto-optic modulation device and is synchronous with the mode locking laser device.
Preferably, the loop control module includes a 3dB coupling device, a dispersion element, an optical amplifying device, a second digital delay generating device, a second acousto-optic modulation device and a third acousto-optic modulation device;
the 3dB coupling device is used for controlling a second optical pulse signal and the optical pulse signal to be detected to enter and exit the loop;
the dispersive element is configured to map a frequency spectrum of the second optical pulse signal in a time dimension;
the second digital delay generating device is used for controlling the second acousto-optic modulation device and the third acousto-optic modulation device;
the second acousto-optic modulation device is used for controlling whether the second optical pulse signal enters the loop again through the coupling device;
the third acousto-optic modulation device is used for controlling whether the second light pulse signal enters the frequency spectrum display module or not;
the optical amplification device is used for amplifying the second optical pulse signal, compensating for the loss of the 3dB coupling device, the second acousto-optic modulation device, the third acousto-optic modulation device and the dispersion element, and obtaining the optical pulse signal to be detected.
Preferably, the spectrum display module includes: photoelectric detection devices and digital oscilloscopes;
the photoelectric detection device is used for completing photoelectric conversion of the optical pulse signal to be detected;
and the digital oscilloscope is used for monitoring the time domain waveform of the optical pulse signal to be detected in real time to obtain a monitoring result.
Preferably, the workflow of the loop control module includes:
when the second optical pulse signal needs to continue to circulate in the loop for the next circle, the driving signal provided by the second digital delay generating device needs to be at a high level, so that the second optical modulator realizes the action of a closed optical switch, and the second optical pulse signal can completely pass through the second optical modulator and enter the loop again; since the second acousto-optic modulator and the third acousto-optic modulator are in opposite phase, and the third acousto-optic modulator is in an off optical switch state at the moment, the spectrum display module does not receive an optical pulse signal in the state; when the optical pulse signal reaches the required cycle number, the second acoustic optical modulator is enabled to be switched off and the third acoustic optical modulator is enabled to be switched on by properly controlling the driving signal provided by the second digital delay generating device, the second acoustic optical modulator prevents the optical pulse signal to be tested from continuing to be transmitted in a loop, and the optical pulse signal to be tested reaches the spectrum display module through the third acoustic optical modulator.
Preferably, the method for obtaining the resolution of the monitoring result comprises:
whereinN is the number of cycles of the optical pulse signal, D is the group velocity dispersion value of the dispersion compensating fiber, L is the length value of the dispersion compensating fiber, f s The sampling frequency of the oscilloscope is shown.
The application also provides an application of the reconfigurable real-time spectral measurement system, which comprises the following steps:
firstly, extracting the optical pulse output by the mode locking laser device by using the first digital delay generating device to change the repetition frequency of the optical pulse signal; then, a loop control module is used for driving the second acousto-optic modulator and the third acousto-optic modulator to realize control of the number of circles of the optical pulse signal circulating in the loop, and the dispersion element is carried in the loop to realize mapping of the frequency spectrum of the optical pulse signal in a time dimension; and finally, performing photoelectric conversion on the optical pulse through a frequency spectrum display module, and completing real-time monitoring on the time domain waveform of the optical pulse signal through the digital oscilloscope.
Preferably, the method for controlling the number of cycles of the optical pulse signal circulating in the loop comprises:
when the optical pulse signal needs to continuously circulate in the loop for the next circle, the driving signal provided by the second digital delay generating device needs to be at a high level, so that the second acoustic optical modulator realizes the action of a closed optical switch to ensure that the optical pulse signal can completely pass through the second acoustic optical modulator and enter the loop again; since the second acousto-optic modulator and the third acousto-optic modulator are in opposite phase, and the third acousto-optic modulator is in an off optical switch state at the moment, the spectrum display module does not receive an optical pulse signal in the state; when the optical pulse signal reaches the required number of cycles, the second acousto-optic modulator is enabled to be switched off and the third acousto-optic modulator is enabled to be switched on by appropriately controlling the driving signal provided by the second digital delay generating device, the second acousto-optic modulator prevents the optical pulse signal to be measured from continuing to be transmitted in a loop, and the optical pulse signal to be measured reaches the spectrum display module through the third acousto-optic modulator.
Compared with the prior art, the beneficial effects of this application are as follows:
the method and the device can flexibly adjust the spectrum measurement resolution of the optical pulse signal according to actual requirements; meanwhile, the frequency spectrum measurement refresh rate of the optical pulse signal can be flexibly controlled according to actual requirements. In addition, the cost and the time for building the dispersion optical fiber are reduced by utilizing the mode of the loop, and meanwhile, the experimental requirement on a large amount of dispersion can be met; meanwhile, the method and the device have the advantages of strong real-time performance, high stability and better sensitivity on optical pulse frequency spectrum monitoring.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for a person skilled in the art to obtain other drawings without any inventive exercise.
Fig. 1 is a schematic structural diagram of a system according to a first embodiment of the present application;
fig. 2 is a schematic spectrum diagram of an original optical pulse signal according to a second embodiment of the present application;
fig. 3 is a schematic diagram of a system measurement effect according to a second embodiment of the present application.
Description of the reference numerals: s101, a first digital delay generator; s102, a mode-locked laser; s103, a first acousto-optic modulator; s104, a dispersion compensation fiber; s105, a second acousto-optic modulator; s106, a third acousto-optic modulator; s107, a second digital delay generator; s108, an optical amplifier; s109, a first 3dB coupler; s1010, a second 3dB coupler; s1011, a photoelectric detector; and S1012, a digital oscilloscope.
Detailed Description
The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, and not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, the present application is described in further detail with reference to the accompanying drawings and the detailed description.
Example one
As shown in fig. 1, a system structure diagram of the embodiment of the present application includes: the device comprises a pulse extraction module, a loop control module and a frequency spectrum display module; the pulse extraction module is used for generating a first optical pulse signal and performing selective extraction to realize the adjustment of the repetition frequency of the first optical pulse signal and obtain a second optical pulse signal; the loop control module is used for controlling the number of circulating circles of the second optical pulse signal in the loop, and carrying a dispersion element in the loop to realize the mapping of the frequency spectrum of the optical pulse signal in the time dimension so as to generate an optical pulse signal to be detected; the frequency spectrum display module is used for carrying out photoelectric conversion on the optical pulse signal to be detected and completing real-time monitoring on the time domain waveform of the optical pulse signal through the digital oscilloscope.
The pulse extraction module includes: a first digital delay generator S101, a mode-locked laser S102 and a first acousto-optic modulator S103; the mode-locked laser S102 is configured to emit a first optical pulse signal, the first acousto-optic modulator S103 is configured to selectively extract the first optical pulse signal, and the first digital delay generator S101 is configured to control the first acousto-optic modulation device and is synchronized with the mode-locked laser device.
The first digital delay generator S101 may be triggered by an external signal and divided to obtain the desired control signal. The mode-locked laser S102 can emit femtosecond optical pulse signals with high power, high repetition rate and large bandwidth. The first acousto-optic modulator S103 can selectively extract the optical pulse signal emitted from the mode-locked laser S102 via the control signal of the first digital delay generator S101.
The loop control module includes: a dispersion compensation fiber S104, a second acousto-optic modulator S105, a third acousto-optic modulator S106, a second digital delay generator S107, an optical amplifier S108, a first 3dB coupler S109, and a second 3dB coupler S1010; wherein the dispersion compensating fiber S104 is used to implement mapping of the spectrum of the optical pulse signal in the time dimension; the second acousto-optic modulator S105 is used for controlling whether the optical pulse signal enters the loop through the coupler again; the third acousto-optic modulator S106 is used for controlling whether the light pulse enters the frequency spectrum display module or not; the second digital delay generator S107 is configured to perform radio frequency control on the second acousto-optic modulator S105 and the third acousto-optic modulator S106, and the optical amplifier S108 is configured to amplify the second optical pulse signal to compensate for loop loss; in the present embodiment, the 3dB coupler is composed of a first 3dB coupler S109 and a second 3dB coupler S1010; the first 3dB coupler S109 and the second 3dB coupler S1010 are used to implement the connection of the loop to the front and rear modules.
And the spectrum display module includes: a photoelectric detection device S1011 and a digital oscilloscope S1012; the photoelectric detection device S1011 is used for completing photoelectric conversion of the optical pulse signal to be detected; the digital oscilloscope S1012 is used to monitor the time domain waveform of the optical pulse signal to be measured in real time, and obtain a monitoring result.
Example two
The following will explain in detail the application of the system in real life with reference to the present embodiment.
And connecting an external electrical output end of the mode-locked laser S102 to an external trigger input interface of the first digital delay generator S101 to complete the synchronous and stable functions of the two instruments. The first digital delay generator S101 pre-divides the frequency of the external trigger signal, and electrically pulses the frequency-divided output signal to the rf interface of the first acousto-optic modulator S103. The optical pulse output end of the mode-locked laser S102 is connected to the optical signal modulation interface of the first acousto-optic modulator S103. Through the electric pulse control after the frequency division of the first digital delay generator S101, the acousto-optic modulator S103 finishes the pulse extraction of the laser source, and the change of the repetition rate of the optical pulse signal is realized, so that the controllable refresh rate of the real-time spectrum system is realized.
The dispersion compensating fiber S104 in the loop control module can provide a larger amount of dispersion to the system over the same length than a conventional single mode fiber. The second acousto-optic modulator S105 and the third acousto-optic modulator S106 are controlled by the same driving signal but are in opposite phases; the second acousto-optic modulator S105 and the third acousto-optic modulator S106 have unique advantages and can be used as optical switches; the second digital delay generator S107 can adjust the delay time and the pulse width of the output driving signal, and is used for controlling the second acousto-optic modulator S105 and the third acousto-optic modulator S106 to complete the control function of the in-out cycle of the optical pulse. The optical amplifier S108 can amplify the optical pulse signal power to compensate for the loss caused by the coupler, the optical switch, and the optical fiber link. The first 3dB coupler S109 and the second 3dB coupler S1010 can realize the distribution or combination of optical signal power among different optical fibers.
The second digital pulse delay generator S107 is used to adjust the delay time and pulse width of the output driving signal, so as to control the second acousto-optic modulator S105 and the third acousto-optic modulator S106, thereby completing the control function of the in-out cycle of the optical pulse. The second optical pulse signal enters a loop for transmission through a first 3dB coupler S109, the loop carries a dispersion compensation fiber S104 and an optical amplifier S108 to respectively realize the mapping of the optical pulse signal frequency spectrum in the time dimension and the amplification of the optical power, after a certain loop time delay, the optical pulse signal reaches the loop output end, and the second 3dB coupler S1010 divides the optical pulse signal into two parts according to the proportion and respectively transmits the two parts to a third acousto-optic modulator S106 and a next module. Through the driving of the control signal, the loop control system completes the control of two reversed-phase acousto-optic modulators S105 and S106 in the system, and the effect of multiple circles of light pulse circulation and loop entering and exiting is realized. When the second optical pulse signal needs to continue to circulate in the loop for the next round, the driving signal provided by the second digital delay generating device S107 needs to be at a high level, so that the second optical modulator S105 performs the function of a closed optical switch to ensure that the second optical pulse signal can completely pass through the second optical modulator S105 and enter the loop again. Since the second acousto-optic modulator S105 and the third acousto-optic modulator S106 are in opposite phase, and the third acousto-optic modulator S106 is in an off optical switch state at this time, the next module does not receive the optical pulse signal in this state. When the optical pulse signal reaches the required number of cycles, the second acousto-optic modulator S105 is switched off and the third acousto-optic modulator S106 is switched on by appropriately controlling the driving signal provided by the second digital delay generator S107, the second acousto-optic modulator S105 blocks the optical pulse signal from continuing to transmit in the loop, and the optical pulse signal reaches the next module through the third acousto-optic modulator S106. By controlling the number of the circulating circles of the light pulses, the total dispersion amount of the system can be controlled, and the reconfiguration of resolution ratio can be realized.
The computational expression for the system resolution is as follows:
where n represents the number of optical pulse signal cycles, D represents the group velocity dispersion value of the dispersion compensating fiber S104, L represents the length of the dispersion compensating fiber, and f s The sampling frequency of the oscilloscope is shown.
Finally, the photoelectric conversion of the optical pulse signal is completed by the photoelectric detector S1011, and the real-time monitoring of the time domain waveform is completed in the digital oscilloscope S1012.
As can be seen from the above expression: when the dispersion compensation fiber characteristic parameters and the sampling rate of the digital oscilloscope S1012 are fixed, the resolution of the system can be controlled to change by changing the number of the circulating loops of the optical pulse signals in the loop, and the higher the number of the circulating loops is, the better the resolution of the system is. As in practical settings, the dispersion compensating fiber has a group velocity dispersion value of 17 × 10 -6 ps/nm 2 When the length value of the dispersion compensation optical fiber is 6000m, the sampling rate of a digital oscilloscope S1012 is 20GSa/S, and the number of cycle turns is 1, the theoretical system resolution is 3.9216nm; when only the number of the circulating loops of the optical pulse signal in the loop is changed to 10, the theoretical system resolution is 0.3922nm; when the number of the circulation circles of the optical pulse signal in the loop is 40, the theoretical system resolution is 0.098nm. For verification, the optical pulse signal circulates 1, 10 and 40 circles in the loop respectively, and the time domain waveform effect received at the spectrum display module is as shown in fig. 3.
The center frequency of an input optical pulse signal is 193.1thz, the bandwidth of 3db is about 15nm, and the input optical pulse signal passes through two band elimination filters with the center frequencies of 193.2THz and 193THz and the bandwidth of 0.8nm respectively. Fig. 2 shows a spectrum diagram of the original optical pulse signal as a reference for the measured effect diagram of the system of fig. 3. It can be seen that in the result graph, the more the number of cycles, the more detailed spectral information can be represented. When the optical pulse signal only circulates for 1 circle in the loop, only the approximate envelope of the spectrum can be seen in the result graph, and the system resolution is better as the number of the circulations increases, so that the characteristic spectral line of the band-elimination filter can be directly observed.
The method and the device utilize pulse extraction to change the repetition rate of the optical pulse signals, and utilize loop control to realize the effect of multiplying or reducing the dispersion quantity, thereby realizing controllable measurement refresh rate and resolution ratio under the condition of not changing an experimental device, and monitoring the frequency spectrum shape of the optical pulse signals in real time.
The above-described embodiments are merely illustrative of the preferred embodiments of the present application, and do not limit the scope of the present application, and various modifications and improvements made to the technical solutions of the present application by those skilled in the art without departing from the design spirit of the present application should fall within the protection scope defined by the claims of the present application.
Claims (8)
1. A reconfigurable real-time spectral measurement system, comprising: the device comprises a pulse extraction module, a loop control module and a frequency spectrum display module;
the pulse extraction module is used for generating a first optical pulse signal and adjusting the repetition frequency of the first optical pulse signal to obtain a second optical pulse signal;
the loop control module is used for controlling the dispersion amount in the system, realizing the mapping of the frequency spectrum of the second optical pulse signal in the time dimension and obtaining the optical pulse signal to be detected;
the frequency spectrum display module is used for carrying out photoelectric conversion on the optical pulse signal to be detected and carrying out real-time monitoring on the time domain waveform of the optical pulse signal to be detected to obtain a monitoring result.
2. The reconfigurable real-time spectral measurement system of claim 1, wherein the pulse extraction module comprises: the device comprises a mode locking laser device, a first digital delay generating device and a first acousto-optic modulation device;
the mode-locked laser device is used for emitting the first optical pulse signal;
the first acousto-optic modulation device is used for selectively extracting the first optical pulse signal, so as to realize the adjustment of the repetition frequency of the first optical pulse signal and obtain the second optical pulse signal;
the first digital delay generating device is used for controlling the first acousto-optic modulation device and is synchronous with the mode locking laser device.
3. The reconfigurable real-time spectral measurement system of claim 1, wherein the loop control module comprises a 3dB coupling device, a dispersive element, an optical amplification device, a second digital delay generation device, a second acousto-optic modulation device and a third acousto-optic modulation device;
the 3dB coupling device is used for controlling a second optical pulse signal and the optical pulse signal to be detected to enter and exit a loop;
the dispersive element is configured to map a frequency spectrum of the second optical pulse signal in a time dimension;
the second digital delay generating device is used for controlling the second acousto-optic modulation device and the third acousto-optic modulation device;
the second acousto-optic modulation device is used for controlling whether the second optical pulse signal enters the loop again through the coupling device;
the third acousto-optic modulation device is used for controlling whether the second light pulse signal enters the frequency spectrum display module or not;
the optical amplification device is used for amplifying the second optical pulse signal, compensating for the loss of the 3dB coupling device, the second acousto-optic modulation device, the third acousto-optic modulation device and the dispersion element, and obtaining the optical pulse signal to be detected.
4. The reconfigurable real-time spectral measurement system of claim 3, wherein the spectral display module comprises: photoelectric detection device and digital oscilloscope;
the photoelectric detection device is used for completing photoelectric conversion of the optical pulse signal to be detected;
and the digital oscilloscope is used for monitoring the time domain waveform of the optical pulse signal to be detected in real time to obtain a monitoring result.
5. The reconfigurable real-time spectral measurement system of claim 4, wherein the workflow of the loop control module comprises:
when the second optical pulse signal needs to continue to circulate in the loop for the next circle, the driving signal provided by the second digital delay generating device needs to be at a high level, so that the second optical modulator realizes the effect of a closed optical switch, and the second optical pulse signal can completely pass through the second optical modulator and enter the loop again; since the second acousto-optic modulator and the third acousto-optic modulator are in opposite phase, and the third acousto-optic modulator is in an off optical switch state at the moment, the spectrum display module does not receive an optical pulse signal in the state; when the optical pulse signal reaches the required number of cycles, the second acousto-optic modulator is enabled to be switched off and the third acousto-optic modulator is enabled to be switched on by appropriately controlling the driving signal provided by the second digital delay generating device, the second acousto-optic modulator prevents the optical pulse signal to be measured from continuing to be transmitted in a loop, and the optical pulse signal to be measured reaches the spectrum display module through the third acousto-optic modulator.
6. The reconfigurable real-time spectral measurement system of claim 4, wherein the method of obtaining a resolution of the monitoring results comprises:
wherein n represents the number of cycles of the optical pulse signal, D represents the group velocity dispersion value of the dispersion compensating fiber, L represents the length value of the dispersion compensating fiber, and f s The sampling frequency of the oscilloscope is shown.
7. Use of a reconfigurable real-time spectral measurement system for controlling a reconfigurable real-time spectral measurement system according to any of claims 1-6, the steps comprising:
firstly, extracting the optical pulse output by the mode-locked laser device by using the first digital delay generating device to change the repetition frequency of the optical pulse signal; then, a loop control module is used for driving the second acousto-optic modulator and the third acousto-optic modulator to realize control of the number of circles of the optical pulse signal circulating in the loop, and the dispersion element is carried in the loop to realize mapping of the frequency spectrum of the optical pulse signal in a time dimension; and finally, performing photoelectric conversion on the optical pulse through a frequency spectrum display module, and completing real-time monitoring on the time domain waveform of the optical pulse signal through the digital oscilloscope.
8. Use of a reconfigurable real-time spectroscopic measurement system according to claim 7, wherein the method of effecting control of the number of turns of the optical pulse signal circulating in the loop comprises:
when the optical pulse signal needs to continuously circulate in the loop for the next circle, the driving signal provided by the second digital delay generating device needs to be at a high level, so that the second acoustic optical modulator realizes the action of a closed optical switch to ensure that the optical pulse signal can completely pass through the second acoustic optical modulator and enter the loop again; since the second acousto-optic modulator and the third acousto-optic modulator are in opposite phase, and the third acousto-optic modulator is in an off optical switch state at the moment, the spectrum display module does not receive an optical pulse signal in the state; when the optical pulse signal reaches the required cycle number, the second acoustic optical modulator is enabled to be switched off and the third acoustic optical modulator is enabled to be switched on by properly controlling the driving signal provided by the second digital delay generating device, the second acoustic optical modulator prevents the optical pulse signal to be tested from continuing to be transmitted in a loop, and the optical pulse signal to be tested reaches the spectrum display module through the third acoustic optical modulator.
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