Sweep frequency laser light source system with signal shaping function

Abstract

The invention discloses a sweep frequency laser light source system with a signal shaping function. The sweep frequency laser light source system comprises an optical fiber Fabry-Perot tunable filter, a light beam wavelength controller, a first isolator, a laser beam amplifier, a signal shaping device, a beam splitter and a second isolator. The fiber Fabry-Perot tunable filter receives a voltage signal to filter a received wide spectrum light beam and outputs a light beam with a specific wavelength. The light beam wavelength controller outputs the voltage signal to the fiber Fabry-Perot tunable filter according to a preset parameter. The laser beam amplifier is used for initially emitting the wide-spectrum light beam and continuously amplifying the light beam with the specific wavelength until the light beam becomes a main light beam. The signal shaper is used for performing half-cycle filtering on the wide-spectrum light beam and the specific-wavelength light beam according to waveform shaping parameters, wherein the waveform shaping parameters have different gain values.

Description

[0001] This application is a divisional application of the invention patent application with the application number 202211364275.4, the application date of November 2, 2022, and the invention name of "swept frequency laser light source system with signal shaping". TECHNICAL FIELD

[0002] The present application relates to a swept frequency laser, in particular to a swept frequency laser light source system with signal shaping capable of adjusting and optimizing the authenticity of three-dimensional information of the object to be observed. BACKGROUND

[0003] Optical coherence tomography (OCT) is also known as optical coherence tomography, optical coherence tomography, which is an imaging technology for acquiring and processing optical signals. It uses low coherence light (such as near-infrared light) to scan and take two-dimensional and three-dimensional images with micron-level resolution from the inside of an optically scattering medium (such as biological tissue); used for medical imaging and industrial non-destructive testing. Optical coherence tomography technology uses the principle of light interference, usually selects near-infrared light with longer wavelength to take pictures, which can penetrate a certain depth of scanning medium. Another similar technology, confocal microscopy, does not penetrate as deep as optical coherence tomography. The light source used by optical coherence tomography includes superluminescent diodes and ultra-short pulse lasers. Depending on the properties of the light source, this scanning method can even achieve sub-micron resolution, which requires the spectrum of the light source to be very wide, with a wavelength range of about 100 nanometers.

[0004] OCT is an optical interference imaging technology, which is quite similar to the Michelson interferometer commonly used in many engineering applications. It is composed of a light source, a reference light path, a measurement light path, and a screen. The biggest difference between OCT and Michelson interferometer is the choice of light source: Michelson interferometer usually uses a laser light source, which can have a long coherence distance, usually up to several meters. However, OCT usually uses a special low-coherence light source to illuminate the sample, such as a light-emitting diode (LED) or a superluminescent diode (SLD). It is precisely because of the difference in coherence characteristics that OCT has the ability of tomographic perspective. The swept frequency laser light source used in OCT still has some deficiencies in the optical interference image signal generated after the detector, such as side peaks, which affect the restoration and observation of the authenticity of the object to be detected.

[0005] Therefore, how to solve the above problems and deficiencies of the prior art is the subject of research and development for relevant industries. SUMMARY

[0006] To solve the above problems, the present application aims to provide a swept laser source system with signal shaping.

[0007] The present application provides a swept laser source system with signal shaping, which is connected to an interferometer module and the interferometer module is connected to a balanced detector, wherein the balanced detector outputs an optical interference waveform signal. The swept laser source system with signal shaping includes a fiber Fabry-Perot tunable filter, a beam wavelength controller, a first isolator, a laser beam amplifier, a signal shaper, a beam splitter and a second isolator. The fiber Fabry-Perot tunable filter receives a voltage signal to filter a received broadband beam and outputs a specific wavelength beam, wherein the voltage signal determines the wavelength range of the specific wavelength beam. The beam wavelength controller is connected to the fiber Fabry-Perot tunable filter, and the beam wavelength controller outputs the voltage signal to the fiber Fabry-Perot tunable filter according to a preset parameter, wherein the preset parameter determines the voltage value of the voltage signal. The first isolator is connected to the output end of the fiber Fabry-Perot tunable filter to receive the specific wavelength beam, and the first isolator outputs the specific wavelength beam in one direction. The laser beam amplifier is connected to the output end of the first isolator, and the laser beam amplifier initially emits the broadband beam and continuously amplifies the specific wavelength beam until the specific wavelength beam becomes the main beam, wherein the broadband beam cannot pass through the first isolator in the opposite direction. The signal shaper is connected to the laser beam amplifier, and the signal shaper performs half-cycle filtering on the broadband beam and the specific wavelength beam according to a waveform shaping parameter, wherein the waveform shaping parameter has different gain values. The beam splitter is connected to the laser beam amplifier at the input end and to the interferometer module at the first output end. The second isolator is connected to the second output end of the beam splitter and the input end of the fiber Fabry-Perot tunable filter, and the second isolator outputs the specific wavelength beam and the broadband beam in one direction.

[0008] In an embodiment of the present application, the signal shaper performs signal shaping on the broadband beam and the specific wavelength beam according to different gain values.

[0009] In an embodiment of the present application, the balanced detector is connected to a computing processor, and the computing processor performs Fourier transform on the optical interference waveform signal to obtain a three-dimensional information waveform signal.

[0010] In an embodiment of the present application, after the signal shaper performs half-cycle filtering and signal shaping on the broadband beam according to different gain values, the optical interference waveform signal is also half-cycle filtered and signal shaped, so that the peaks of the three-dimensional information waveform signal are converted to flat and symmetrical on both sides.

[0011] In an embodiment of the present application, the beam splitter splits the specific wavelength beam in a one-to-one light quantity ratio.

[0012] The present application also provides a swept frequency laser light source system with signal shaping, comprising: a fiber Fabry-Perot tunable filter configured to receive a voltage signal to filter a received wide spectrum light beam and output a specific wavelength light beam, wherein the voltage signal determines the wavelength range of the specific wavelength light beam; a light beam wavelength controller connected to the fiber Fabry-Perot tunable filter, the light beam wavelength controller configured to output the voltage signal to the fiber Fabry-Perot tunable filter according to a preset parameter; a laser light beam amplifier connected to the fiber Fabry-Perot tunable filter, the laser light beam amplifier configured to initially emit the wide spectrum light beam and continuously amplify the specific wavelength light beam until the specific wavelength light beam becomes a main light beam; and a signal shaper connected to the laser light beam amplifier, the signal shaper configured to perform half-cycle filtering on the specific wavelength light beam according to a waveform shaping parameter.

[0013] The present application also provides a swept frequency laser light source system with signal shaping, comprising: a fiber Fabry-Perot tunable filter configured to receive a voltage signal to filter a received wide spectrum light beam and output a specific wavelength light beam, wherein the voltage signal determines the wavelength range of the specific wavelength light beam; a light beam wavelength controller connected to the fiber Fabry-Perot tunable filter, the light beam wavelength controller configured to output the voltage signal to the fiber Fabry-Perot tunable filter according to a preset parameter; and a laser light beam amplifier connected to the fiber Fabry-Perot tunable filter.

[0014] In summary, the swept frequency laser light source system with signal shaping provided by the present application can achieve the following effects:

[0015] 1. By performing half-cycle filtering and signal waveform adjustment on the specific wavelength light beam of the wide spectrum light beam, a better optical interference waveform signal and three-dimensional information waveform signal can be obtained; and

[0016] 2. The three-dimensional information authenticity of the object to be observed can be adjusted simply by adjusting the gain value.

[0017] The purposes, technical contents, characteristics and effects of the present application will be further illustrated in detail by specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 FIG. 1 is a block diagram of the swept frequency laser light source system with signal shaping of the present application.

[0019] Figure 2Block diagram of the signal shaping swept laser source system of the present invention applied to an interferometer system.

[0020] Figure 3A Diagram of the low pass ideal waveform of the signal shaper of the present invention.

[0021] Figure 3B Another diagram of the low pass ideal waveform of the signal shaper of the present invention.

[0022] Figure 3C Diagram of the low pass actual waveform of the signal shaper of the present invention.

[0023] Figure 4A Diagram of the optical interference waveform signal without signal shaping of the present invention under the prior art.

[0024] Figure 4B Diagram of the three-dimensional information waveform signal without signal shaping of the present invention under the prior art.

[0025] Figure 5A Diagram of the optical interference waveform signal processed by the signal shaping swept laser source system of the present invention.

[0026] Figure 5B Diagram of the three-dimensional information waveform signal processed by the signal shaping swept laser source system of the present invention.

[0027] BRIEF DESCRIPTION OF DRAWINGS 100 - signal shaping swept laser source system; 110 - fiber Fabry-Perot tunable filter; 120 - beam wavelength controller; 130 - first isolator; 140 - laser beam amplifier; 150 - signal shaper; 160 - beam splitter; 170 - second isolator; 200 - interferometer module; 300 - balanced detector; 400 - operation processor; LS - optical interference waveform signal; T - three-dimensional information waveform signal; VS - voltage signal; WS - wide spectrum beam; AS - specific wavelength beam. DETAILED DESCRIPTION

[0028] To solve the problem of the authenticity of the object to be inspected under the existing three-dimensional tomography, the inventor has improved the existing product after years of research and development. The present invention will be described in detail below.

[0029] Please refer to Figures 1-2 , Figure 1 Block diagram of the signal shaping swept laser source system of the present invention. Figure 2Figure 1 is a block diagram of a signal shaping swept laser source system applied to an interferometer system. As shown, the signal shaping swept laser source system 100 is connected to an interferometer module 200 and the interferometer module 200 is connected to a balanced detector 300, wherein the balanced detector 300 outputs an optical interference waveform signal LS, and the balanced detector 300 is connected to a processing unit 400, so that the processing unit 400 further processes the optical interference waveform signal LS. In frequency domain optical coherence tomography, broadband interferometric signals are acquired by a frequency domain splitting detector, which can be either time encoded by using a variable frequency light source at different frequencies at different times or a dispersive detector such as a grating and a linear detector array. According to the Wiener-Khintchine theorem in Fourier transform, the autocorrelation function of a signal and its power spectral density are Fourier transform pairs of each other, so that a depth scan can be obtained by Fourier transforming the acquired frequency spectrum. In addition, the signal shaping swept laser source system 100 forms a loop, and a beamsplitter is used to split the light beam in the loop to the interferometer module 200 to perform optical interference effect.

[0030] Next, the details of the signal shaping swept laser source system 100 will be further described.

[0031] Please refer to Figures 1-5B , Figure 3A Figure 2 is a schematic diagram of a low pass ideal waveform of the signal shaper of the present application. Figure 3B Figure 3 is another schematic diagram of a low pass ideal waveform of the signal shaper of the present application. Figure 3C Figure 4 is a schematic diagram of a low pass actual waveform of the signal shaper of the present application. Figure 4A Figure 5 is a schematic diagram of an optical interference waveform signal without signal shaping of the present application in the prior art. Figure 4B Figure 6 is a schematic diagram of a three-dimensional information waveform signal without signal shaping of the present application in the prior art. Figure 5A Figure 7 is a schematic diagram of a processed optical interference waveform signal of the signal shaping swept laser source system of the present application. Figure 5BFig. 1 is a schematic diagram of a signal shaping swept laser source system 100 according to the present application. The signal shaping swept laser source system 100 includes a fiber Fabry-Perot tunable filter 110, a beam wavelength controller 120, a first isolator 130, a laser beam amplifier 140, a signal shaper 150, a beam splitter 160, and a second isolator 170. The fiber Fabry-Perot tunable filter 110 is configured to receive a voltage signal VS to filter a received wide spectrum beam WS and output a specific wavelength beam AS, wherein the voltage signal VS determines a wavelength range of the specific wavelength beam AS, and the specific wavelength beam AS refers to a beam at a certain wavelength range. The beam wavelength controller 120 is connected to the fiber Fabry-Perot tunable filter 110, and the beam wavelength controller 120 is configured to output the voltage signal VS to the fiber Fabry-Perot tunable filter 110 according to a predetermined parameter, wherein the predetermined parameter determines a voltage value of the voltage signal VS. The first isolator 130 is connected to an output end of the fiber Fabry-Perot tunable filter 110 to receive the specific wavelength beam AS, and the first isolator 130 is configured to output the specific wavelength beam AS in a single direction. The laser beam amplifier 140 is connected to an output end of the first isolator 130 to receive the specific wavelength beam AS, and the laser beam amplifier 140 is configured to initially emit the wide spectrum beam WS and continuously amplify the specific wavelength beam AS filtered by the fiber Fabry-Perot tunable filter 110 until the specific wavelength beam AS becomes a main beam in a loop, wherein the wide spectrum beam WS cannot pass through the first isolator 130 in a reverse direction. The signal shaper 150 is connected to the laser beam amplifier 140. An input end of the beam splitter 160 is connected to the laser beam amplifier 140, and a first output end and a second output end of the beam splitter 160 are connected to an interferometer module 200 and the second isolator 170, respectively, wherein the beam splitter 160 splits the specific wavelength beam AS as the main beam in the loop by a one-to-one light quantity ratio. The second isolator 170 is connected to the second output end of the beam splitter 160 and an input end of the fiber Fabry-Perot tunable filter 110, and the second isolator 170 is configured to output the specific wavelength beam AS and the wide spectrum beam WS in a single direction, wherein the second isolator 170 has the same function as the first isolator 130 to allow the beams to pass through in a single direction.

[0032] It should be noted that the signal shaper 150 of the present application is used to perform half-cycle filtering on the wide-spectrum light beam WS and the specific wavelength light beam AS according to a waveform shaping parameter, wherein the waveform shaping parameter has different gain values, wherein the gain values of the waveform shaping parameter can be set by the designer according to actual conditions to meet various actual needs. The signal shaper 150 performs signal shaping on the wide-spectrum light beam WS and the specific wavelength light beam AS according to different gain values, so that the signal waveform is closer to or equivalent to the authenticity of the three-dimensional information of the object to be observed. After the signal shaper 150 performs half-cycle filtering on the wide-spectrum light beam WS and signal shaping on the wide-spectrum light beam WS according to different gain values, the rear-end optical interference waveform signal LS is also half-cycle filtered and signal shaped, so that the wave peaks of the three-dimensional information waveform signal TS are converted to flat and symmetric.

[0033] Further, as shown in Figure 3A and Figure 3B , it is a filter waveform of an ideal signal shaper 150 and the gain values are all the same, which will perform half-cycle filtering on the wide-spectrum light beam WS and the specific wavelength light beam AS, but cannot reshape the signal waveform at this time, at which time the first half cycle or the second half cycle can be selected. In order to improve the side peak effect, the filter waveform of the signal shaper 150 shown in Figure 3C can be used to perform signal shaping on the wide-spectrum light beam WS and the specific wavelength light beam AS according to different gain values, so that the half-cycle optical interference waveform signal LS is more perfect, so as to improve the side peak effect after the optical interference waveform signal LS is sent into the operation processor 400 for Fourier transform, so that the signal waveform is closer to or equivalent to the authenticity. Therefore, according to the above description, Figure 4A , the optical interference waveform signal of the prior art is processed by the signal-shaped swept-frequency laser light source system 100 of the present application to become Figure 5A the optical interference waveform signal LS; Figure 4B , the three-dimensional information waveform signal of the prior art is processed by the signal-shaped swept-frequency laser light source system 100 of the present application to become Figure 5B the three-dimensional information waveform signal TS.

[0034] By comparing Figure 4A and Figure 5A , it can be seen that Figure 5A , only the front half of each cycle of the optical interference waveform signal LS has a waveform signal, and the rear half has no waveform signal, and the curvature at the side peak is also optimized and deformed. Next, by comparing Figure 4B and Figure 5B , it can be seen that the side peak of the three-dimensional information waveform signal TS is different from the three-dimensional information waveform signal of the prior art, Figure 4BThe side peak of the three-dimensional information waveform signal under the prior art is slightly high, which will affect the authenticity of the three-dimensional information of the object to be observed, and Figure 5B The side peak of the three-dimensional information waveform signal TS has been eliminated to zero, so the authenticity of the three-dimensional information of the object to be observed can be more completely presented.

[0035] In summary, the swept frequency laser light source system with signal shaping provided by the present application can achieve the following effects:

[0036] 1. The better optical interference waveform signal waveform and three-dimensional information waveform are obtained by performing half-cycle filtering and signal waveform adjustment on the specific wavelength beam of the wide spectrum light beam; and

[0037] 2. The authenticity of the three-dimensional information of the object to be observed is optimized simply by adjusting the gain value.

[0038] The above only describes the preferred embodiments of the present application, and is not intended to limit the scope of the present application. Therefore, any equivalent changes or modifications made in accordance with the features and spirit of the present application described in the claims of the present application shall be included in the protection scope of the present application.

Claims

1. A swept-frequency laser source system with signal shaping, configured to be connected to an interferometer module and the interferometer module to a balanced detector, wherein the balanced detector outputs an optical interference waveform signal, characterized in that, This frequency-sweeping laser source system with signal shaping includes: A fiber Fabry-Perot tunable filter is used to receive a voltage signal to filter a received broadband beam and output a beam of a specific wavelength, wherein the voltage signal determines the wavelength range of the specific wavelength beam. A beam wavelength controller is connected to the fiber Fabry-Perot tunable filter. The beam wavelength controller is used to output the voltage signal to the fiber Fabry-Perot tunable filter according to a preset parameter, wherein the preset parameter determines the voltage value of the voltage signal. A first isolator is connected to the output of the fiber optic Fabry-Perot tunable filter to receive the specific wavelength beam, and the first isolator is used to output the specific wavelength beam in one direction. A laser beam amplifier is connected to the output of the first isolator. The laser beam amplifier is used to initially emit the broadband beam and continuously amplify the specific wavelength beam until the specific wavelength beam becomes the main beam, wherein the broadband beam cannot pass back through the first isolator. A signal shaper connected to the laser beam amplifier is used to perform half-cycle filtering on the broadband beam and the specific wavelength beam according to a waveform shaping parameter, wherein the waveform shaping parameter has different gain values. A beam splitter, the input of which is connected to the laser beam amplifier, and the first output of which is connected to an interferometer module; and A second isolator is connected to the second output of the beam splitter and the input of the fiber Fabry-Perot tunable filter. The second isolator is used to output the specific wavelength beam and the broadband beam in one direction.

2. The sweeping laser source system with signal shaping as described in claim 1, characterized in that, The signal shaper shapes the broadband beam and the beam of a specific wavelength according to different gain values.

3. The sweeping laser source system with signal shaping as described in claim 1, characterized in that, The balance detector is connected to a processing unit, which performs a Fourier transform on the optical interference waveform signal to obtain a three-dimensional information waveform signal.

4. The sweeping laser source system with signal shaping as described in claim 3, characterized in that, After the signal shaper performs half-cycle filtering on the broadband beam and shapes the broadband beam according to different gain values, the optical interference waveform signal can also be half-cycle filtered and shaped to make the peaks of the three-dimensional information waveform signal flat and symmetrical.

5. The sweeping laser source system with signal shaping as described in claim 1, characterized in that, The beam splitter uses a 1:1 light quantity ratio to split a beam of a specific wavelength.

6. A swept-frequency laser source system with signal shaping, characterized in that, include: A fiber Fabry-Perot tunable filter is used to receive a voltage signal to filter a received broadband beam and output a beam of a specific wavelength, wherein the voltage signal determines the wavelength range of the specific wavelength beam. A beam wavelength controller is connected to the fiber Fabry-Perot tunable filter, and the beam wavelength controller is used to output the voltage signal to the fiber Fabry-Perot tunable filter according to a preset parameter; A laser beam amplifier, connected to the fiber Fabry-Perot tunable filter, is used to initially emit the broadband beam and continuously amplify the specific wavelength beam until that specific wavelength beam becomes the dominant beam; and A signal shaper, connected to the laser beam amplifier, is used to perform half-cycle filtering on the beam of a specific wavelength according to a waveform shaping parameter.

7. The sweeping laser source system with signal shaping as described in claim 6, characterized in that, The preset parameter determines the voltage value of the voltage signal.

8. The sweeping laser source system with signal shaping as described in claim 6 or 7, characterized in that, The waveform shaping parameter has different gain values.

9. The sweeping laser source system with signal shaping as described in claim 8, characterized in that, The signal shaper also performs half-cycle filtering on the broadband beam based on the waveform shaping parameters.

10. The sweeping laser source system with signal shaping as described in claim 9, characterized in that, The signal shaper shapes the broadband beam and the specific wavelength beam according to different gain values.

11. The sweeping laser source system with signal shaping as described in claim 10, characterized in that, It also includes a first isolator connected to the output of the fiber optic Fabry-Perot tunable filter to receive the specific wavelength beam, the first isolator being used to output the specific wavelength beam in one direction.

12. The sweeping laser source system with signal shaping as described in claim 11, characterized in that, The broadband beam cannot pass through the first isolator in reverse.

13. The sweeping laser source system with signal shaping as described in claim 12, characterized in that, The sweeping laser source system with signal shaping is connected to an interferometer module.

14. The sweeping laser source system with signal shaping as described in claim 13, characterized in that, The interferometer module is connected to a balance detector, which outputs an optical interference waveform signal.

15. The sweeping laser source system with signal shaping as described in claim 14, characterized in that, The balance detector is connected to a processing unit, which performs a Fourier transform on the optical interference waveform signal to obtain a three-dimensional information waveform signal.

16. The sweeping laser source system with signal shaping as described in claim 15, characterized in that, The optical interference waveform signal can also be half-cycle filtered and shaped to make the peaks of the three-dimensional information waveform signal flat and symmetrical.

17. The sweeping laser source system with signal shaping as described in claim 16, characterized in that, It also includes a beam splitter, the input of which is connected to the laser beam amplifier, and the first output of which is connected to the interferometer module.

18. The sweeping laser source system with signal shaping as described in claim 17, characterized in that, The beam splitter uses a 1:1 light quantity ratio to split a beam of a specific wavelength.

19. The sweeping laser source system with signal shaping as described in claim 17 or 18, characterized in that, It also includes a second isolator connected to the second output of the beam splitter and the input of the fiber Fabry-Perot tunable filter. The second isolator is used to output the specific wavelength beam and the broadband beam in one direction.

20. A swept-frequency laser source system with signal shaping, characterized in that, include: A fiber Fabry-Perot tunable filter is used to receive a voltage signal to filter a received broadband beam and output a beam of a specific wavelength, wherein the voltage signal determines the wavelength range of the specific wavelength beam. A beam wavelength controller connected to the fiber Fabry-Perot tunable filter, the beam wavelength controller being configured to output the voltage signal to the fiber Fabry-Perot tunable filter according to a preset parameter; and A laser beam amplifier is connected to the fiber Fabry-Perot tunable filter.

21. The sweeping laser source system with signal shaping as described in claim 20, characterized in that, The laser beam amplifier is used to initially emit the broadband beam.

22. The sweeping laser source system with signal shaping as described in claim 20 or 21, characterized in that, The laser beam amplifier continuously amplifies the specific wavelength beam until it becomes the dominant beam.

23. The sweeping laser source system with signal shaping as described in claim 22, characterized in that, It also includes a signal shaper connected to the laser beam amplifier, which is used to perform half-cycle filtering on the specific wavelength beam according to a waveform shaping parameter.

24. The sweeping laser source system with signal shaping as described in claim 23, characterized in that, The preset parameter determines the voltage value of the voltage signal.

25. The sweeping laser source system with signal shaping as described in claim 24, characterized in that, The waveform shaping parameter has different gain values.

26. The sweeping laser source system with signal shaping as described in claim 25, characterized in that, The signal shaper also performs half-cycle filtering on the broadband beam based on the waveform shaping parameters.

27. The sweeping laser source system with signal shaping as described in claim 26, characterized in that, The signal shaper shapes the broadband beam and the specific wavelength beam according to different gain values.

28. The sweeping laser source system with signal shaping as described in claim 27, characterized in that, It also includes a first isolator connected to the output of the fiber optic Fabry-Perot tunable filter to receive the specific wavelength beam, the first isolator being used to output the specific wavelength beam in one direction.

29. The sweeping laser source system with signal shaping as described in claim 28, characterized in that, The broadband beam cannot pass through the first isolator in reverse.

30. The sweeping laser source system with signal shaping as described in claim 29, characterized in that, The sweeping laser source system with signal shaping is connected to an interferometer module.

31. The sweeping laser source system with signal shaping as described in claim 30, characterized in that, The interferometer module is connected to a balance detector, which outputs an optical interference waveform signal.

32. The sweeping laser source system with signal shaping as described in claim 31, characterized in that, The balance detector is connected to a processing unit, which performs a Fourier transform on the optical interference waveform signal to obtain a three-dimensional information waveform signal.

33. The sweeping laser source system with signal shaping as described in claim 32, characterized in that, The optical interference waveform signal can also be half-cycle filtered and shaped to make the peaks of the three-dimensional information waveform signal flat and symmetrical.

34. The sweeping laser source system with signal shaping as described in claim 33, characterized in that, It also includes a beam splitter, the input of which is connected to the laser beam amplifier, and the first output of which is connected to the interferometer module.

35. The sweeping laser source system with signal shaping as described in claim 34, characterized in that, The beam splitter uses a 1:1 light quantity ratio to split a beam of a specific wavelength.

36. The sweeping laser source system with signal shaping as described in claim 34 or 35, characterized in that, It also includes a second isolator connected to the second output of the beam splitter and the input of the fiber Fabry-Perot tunable filter. At the end, the second isolator is used to output the specific wavelength beam and the broadband beam in one direction.

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