CN219891059U - Sweep frequency laser light source system with signal shaping function - Google Patents
Sweep frequency laser light source system with signal shaping function Download PDFInfo
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- CN219891059U CN219891059U CN202222948114.1U CN202222948114U CN219891059U CN 219891059 U CN219891059 U CN 219891059U CN 202222948114 U CN202222948114 U CN 202222948114U CN 219891059 U CN219891059 U CN 219891059U
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- 238000007493 shaping process Methods 0.000 title claims abstract description 44
- 239000013307 optical fiber Substances 0.000 claims abstract description 21
- 238000001228 spectrum Methods 0.000 claims abstract description 16
- 238000001914 filtration Methods 0.000 claims abstract description 10
- 230000003287 optical effect Effects 0.000 claims description 25
- 230000001131 transforming effect Effects 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 18
- 238000012014 optical coherence tomography Methods 0.000 description 13
- 230000000694 effects Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 4
- 238000003384 imaging method Methods 0.000 description 2
- 238000003491 array Methods 0.000 description 1
- 238000005311 autocorrelation function Methods 0.000 description 1
- 230000001427 coherent effect Effects 0.000 description 1
- 238000004624 confocal microscopy Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000002059 diagnostic imaging Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 238000003325 tomography Methods 0.000 description 1
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Abstract
The utility model discloses a sweep frequency laser light source system with signal shaping, which comprises an optical fiber Fabry-Perot adjustable filter, a light beam wavelength controller, a first isolator, a laser beam amplifier, a signal shaper, a beam splitter and a second isolator. The optical fiber Fabry-Perot tunable filter receives a voltage signal to filter a received wide-spectrum light beam and output a light beam with a specific wavelength. The light beam wavelength controller outputs the voltage signal to the optical fiber Fabry-Perot adjustable 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 becoming a main light beam. The signal shaper is used for half-period filtering of a broad-spectrum light beam and a light beam with a specific wavelength according to waveform shaping parameters, wherein the waveform shaping parameters have different gain values.
Description
Technical Field
The utility model relates to a sweep frequency laser, in particular to a sweep frequency laser light source system with signal shaping function, which can adjust and optimize the three-dimensional information fidelity of an object to be observed.
Background
Optical coherence tomography (Optical coherence tomography, OCT), also known as optical coherence tomography, is an imaging technique for acquiring and processing optical signals by scanning with low coherence light (e.g., near infrared light) and capturing micron-sized resolution two-dimensional and three-dimensional images from within an optical scattering medium (e.g., biological tissue); the method is used for medical imaging and industrial nondestructive detection. Optical coherence tomography utilizes the principle of interference of light, usually selects near-infrared light with longer wavelength for photographing, and can pass through a scanning medium with a certain depth. Another similar technique, confocal microscopy, does not penetrate the depth of the sample as optical coherence tomography. Light sources used in optical coherence tomography include superluminescent diodes and ultrashort pulse lasers. According to the different properties of the light source, the scanning mode can even reach submicron resolution, and the spectrum of the light source is required to be very wide, and the wavelength variation range is about 100 nanometers.
OCT is an optical interference imaging technique, quite similar to the michelson interferometer (Michelson Interferometer) commonly used in many engineering at present, and 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 that the light source is selected as follows: michelson interferometers typically employ a laser source that can be coherent over a long distance, typically up to several meters. However, OCT typically uses a special low coherence light source to illuminate the sample, such as a Light Emitting Diode (LED) or a super-lumen diode (Superluminescent Diode; SLD), and also because of the differences in coherence properties, OCT has tomographic capabilities. The optical interference image signal generated by the sweep laser light source after the detector in the current OCT still has insufficient places, such as side peaks, which influence the reduction and observation of the reality of the object to be detected.
Therefore, how to solve the above-mentioned problems and disadvantages of the prior art is a subject to be developed by the related industry.
Disclosure of Invention
In order to solve the above problems, an object of the present utility model is to provide a swept laser light source system with signal shaping.
The utility model provides a sweep frequency laser light source system with signal shaping, which is used for being connected to an interferometer module and the interferometer module is connected to a balance detector, wherein the balance detector outputs an optical interference waveform signal. The sweep frequency laser light source system with signal shaping comprises an optical fiber Fabry-Perot adjustable filter, a light beam wavelength controller, a first isolator, a laser beam amplifier, a signal shaper, a beam splitter and a second isolator. The optical fiber Fabry-Perot tunable filter is used for receiving 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. The optical beam wavelength controller is connected to the optical fiber Fabry-Perot tunable filter and is used for outputting the voltage signal to the optical fiber Fabry-Perot tunable filter according to a preset parameter, wherein the preset parameter determines the voltage value of the voltage signal. And the first isolator is connected to the output end of the optical fiber Fabry-Perot tunable filter to receive the specific wavelength light beam, and is used for outputting the specific wavelength light beam in a unidirectional way. The laser beam amplifier is connected to the output end of the first isolator, and is used for initially emitting the wide-spectrum light beam, and continuously amplifying the specific-wavelength light beam until the specific-wavelength light beam becomes a main light beam, wherein the wide-spectrum light beam cannot reversely pass through the first isolator. The signal shaper is connected to the laser beam amplifier and is used for performing half-period filtering on the wide-band light beam and the specific-wavelength light beam according to a waveform shaping parameter, wherein the waveform shaping parameter has different gain values. The beam splitter has an input end connected to the laser beam amplifier and a first output end connected to an interferometer module. And the second isolator is connected to the second output end of the beam splitter and the input end of the optical fiber Fabry-Perot tunable filter and is used for outputting the specific wavelength light beam and the wide-frequency spectrum light beam in one direction.
In one embodiment of the present utility model, the signal shaper performs signal shaping on the broad spectrum light beam and the specific wavelength light beam according to different gain values.
In one embodiment of the present utility model, the balance detector is connected to an operation processor, and the operation processor is configured to fourier transform the optical interference waveform signal to obtain a three-dimensional information waveform signal.
In an embodiment of the present utility model, after the signal shaper performs half-period filtering on the wide-spectrum light beam and performs signal shaping on the wide-spectrum light beam according to different gain values, the optical interference waveform signal is also half-period filtered and signal shaped, so that two sides of a peak of the three-dimensional information waveform signal are converted into flat and symmetrical.
In one embodiment of the present utility model, the beam splitter splits the specific wavelength beam by a one-to-one ratio of the amounts of light.
In summary, the swept laser light source system with signal shaping provided by the utility model can achieve the following effects:
1. the optimal optical interference waveform signal waveform and the three-dimensional information waveform signal are obtained by half-period filtering and signal waveform adjustment on the light beam with the specific wavelength of the broad spectrum light beam; and
2. the three-dimensional information fidelity of the object to be observed is adjusted simply through adjustment of the gain value.
The objects, technical contents, features and effects achieved by the present utility model will be more readily understood by the following detailed description of specific embodiments.
Drawings
Fig. 1 is a block diagram of a swept laser source system with signal shaping according to the present utility model.
FIG. 2 is a block diagram of the system of the present utility model for applying a swept laser source system with signal shaping to an interferometer system.
Fig. 3A is a schematic diagram of a low-pass ideal waveform of the signal shaper of the present utility model.
Fig. 3B is another schematic diagram of the low-pass ideal waveform of the signal shaper of the present utility model.
Fig. 3C is a schematic diagram of the low-pass actual waveform of the signal shaper of the present utility model.
FIG. 4A is a schematic diagram of an optical interference waveform signal without signal shaping according to the present utility model in the prior art.
Fig. 4B is a schematic diagram of a three-dimensional information waveform signal without signal shaping according to the present utility model in the prior art.
FIG. 5A is a schematic diagram of an optical interference waveform signal processed by a swept laser source system with signal shaping according to the utility model.
Fig. 5B is a schematic diagram of a three-dimensional information waveform signal processed by the swept laser source system with signal shaping according to the utility model.
Reference numerals illustrate: 100-a sweep frequency laser light source system with signal shaping; 110-optical fiber fabry-perot tunable filter; 120-beam wavelength controller; 130-a first isolator; 140-a laser beam amplifier; 150-a signal shaper; 160-beam splitters; 170-a second isolator; 200-interferometer module; 300-balance detector; 400-an arithmetic processor; LS-optical interference waveform signals; t-three-dimensional information waveform signals; VS-voltage signal; WS-broad spectrum beam; AS-specific wavelength beam.
Detailed Description
In order to solve the problem of insufficient reality of the object to be detected under the existing three-dimensional tomography, the creator has researched and developed for many years, so as to improve the problem of the existing product, and the method for achieving the most effective functional requirement by using the sweep laser light source system with signal shaping is described in detail later.
Referring to fig. 1 to 2, fig. 1 is a block diagram of a swept laser light source system with signal shaping according to the present utility model. FIG. 2 is a block diagram of the system of the present utility model for applying a swept laser source system with signal shaping to an interferometer system. As shown, the swept laser light source system with signal shaping 100 is connected to the 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 an operation processor 400, so that the operation processor 400 further processes the optical interference waveform signal LS. In frequency domain optical coherence tomography, broadband interference signals are acquired by frequency domain split detectors, either by time encoding of frequencies at different times using a variable frequency source or by using dispersive detectors such as gratings and linear detector arrays. According to the wiener-Xin Qin theorem in fourier transform, the autocorrelation function of a signal is a fourier transform pair with its power spectral density, so that a depth scan can be obtained immediately by fourier transforming the obtained spectrum. In addition, a loop is formed inside the swept laser light source system 100 with signal shaping, and the beam in the loop is split to the interferometer module 200 by a beam splitter to perform optical interference effect.
Next, relevant details of the swept laser light source system 100 with signal shaping will be further described.
Referring to fig. 1 to 5B, fig. 3A is a schematic diagram of a low-pass ideal waveform of the signal shaper of the present utility model. Fig. 3B is another schematic diagram of the low-pass ideal waveform of the signal shaper of the present utility model. Fig. 3C is a schematic diagram of the low-pass actual waveform of the signal shaper of the present utility model. FIG. 4A is a schematic diagram of an optical interference waveform signal without signal shaping according to the present utility model in the prior art. Fig. 4B is a schematic diagram of a three-dimensional information waveform signal without signal shaping according to the present utility model in the prior art. FIG. 5A is a schematic diagram of an optical interference waveform signal processed by a swept laser source system with signal shaping according to the utility model. Fig. 5B is a schematic diagram of a three-dimensional information waveform signal processed by the swept laser source system with signal shaping according to the utility model. The swept laser light source system with signal shaping 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 optical fiber fp filter 110 is configured to receive a voltage signal VS to filter a received broad spectrum light beam WS and output a specific wavelength light beam AS, wherein the voltage signal VS determines a wavelength range of the specific wavelength light beam AS, and the specific wavelength light beam AS is a light beam located in a certain wavelength range. The light beam wavelength controller 120 is connected to the optical fiber fp filter 110, and the light beam wavelength controller 120 is configured to output a voltage signal VS to the optical fiber fp 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 the output end of the optical 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 the output end of the first isolator 130 to receive the specific wavelength beam AS, the laser beam amplifier 140 is configured to initially emit a broad spectrum beam WS, and continuously amplify the specific wavelength beam AS filtered by the optical fiber fabry-perot tunable filter 110 until the specific wavelength beam AS becomes a main beam in the loop, wherein the broad spectrum beam WS cannot reversely pass through the first isolator 130. The signal shaper 150 is connected to the laser beam amplifier 140. The input end of the beam splitter 160 is connected to the laser beam amplifier 140, and the first output end and the second output end of the beam splitter 160 are respectively connected to an interferometer module 200 and a second isolator 170, wherein the beam splitter 160 splits a specific wavelength beam AS, which is a main beam, in a loop in a one-to-one light quantity ratio. The second isolator 170 is connected to the second output end of the beam splitter 160 and the input end of the optical 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, so that the beam can only pass in a single direction.
It should be noted that the signal shaper 150 of the present utility model is configured to perform half-period filtering on the broad 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, and the gain values of the waveform shaping parameter can be set by a designer according to actual situations so AS to meet various actual requirements. The signal shaper 150 performs signal shaping on the broad spectrum beam WS and the specific wavelength beam AS according to different gain values, so that the signal waveform is more similar or equivalent to the reality of the three-dimensional information of the object to be observed. After the signal shaper 150 performs half-period filtering on the wide-spectrum light beam WS and performs signal shaping on the wide-spectrum light beam WS according to different gain values, the optical interference waveform signal LS at the back end is also half-period filtered and signal shaped, so that two sides of the peak of the three-dimensional information waveform signal TS are converted into flat and symmetrical.
Further, AS shown in fig. 3A and 3B, which are ideal filtering waveforms of the signal shaper 150 and have the same gain values, half-period filtering is performed on the wide-spectrum beam WS and the specific-wavelength beam AS, but the signal waveform cannot be reshaped, and the first half period or the second half period can be selected. In order to improve the side peak effect, the filtered waveform of the signal shaper 150 shown in fig. 3C may be used to shape the signals of the broad spectrum beam WS and the specific wavelength beam AS according to different gain values, so that the half-period optical interference waveform signal LS is more perfect, and the side peak effect can be improved after the optical interference waveform signal LS is sent to the operation processor 400 for fourier transformation, so that the signal waveform is more similar or equivalent to the reality. Therefore, according to the above description, the optical interference waveform signal in the prior art of fig. 4A is processed by the swept laser light source system 100 with signal shaping according to the present utility model and becomes the optical interference waveform signal LS of fig. 5A; the three-dimensional information waveform signal of fig. 4B is processed by the swept laser light source system 100 with signal shaping according to the prior art, and then becomes the three-dimensional information waveform signal TS of fig. 5B.
As can be seen from comparing fig. 4A and fig. 5A, only the first half of the optical interference waveform signal LS in fig. 5A has the waveform signal in each period, and the second half has no waveform signal, and the radian at the side peak is also optimized. Next, as can be seen from comparing fig. 4B and fig. 5B, the side peak of the three-dimensional information waveform signal TS is different from the three-dimensional information waveform signal in the prior art, and the side peak of the three-dimensional information waveform signal in the prior art in fig. 4B is slightly higher, which affects the reality of the three-dimensional information of the object to be observed, whereas the side peak of the three-dimensional information waveform signal TS in fig. 5B is eliminated to be zero, so that the reality of the three-dimensional information of the object to be observed can be more completely presented.
In summary, the swept laser light source system with signal shaping provided by the utility model can achieve the following effects:
1. the optimal optical interference waveform signal waveform and the three-dimensional information waveform signal are obtained by half-period filtering and signal waveform adjustment on the light beam with the specific wavelength of the broad spectrum light beam; and
2. the three-dimensional information fidelity of the object to be observed is optimized simply through adjustment of the gain value.
The foregoing description is only of the preferred embodiment of the utility model and is not intended to limit the scope of the utility model. It is therefore intended that all such equivalent variations or modifications as fall within the scope of the utility model as defined in the appended claims be embraced thereby.
Claims (3)
1. A swept laser light source system with signal shaping for connection 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 light source system with signal shaping comprising:
the optical fiber Fabry-Perot tunable filter is used for receiving 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 optical fiber Fabry-Perot tunable filter, the light beam wavelength controller outputting the voltage signal to the optical fiber Fabry-Perot tunable filter according to a preset parameter, wherein the preset parameter determines a voltage value of the voltage signal;
a first isolator connected to the output end of the optical fiber fabry-perot tunable filter to receive the specific wavelength beam, the first isolator being configured to output the specific wavelength beam in a single direction;
a laser beam amplifier connected to the output end of the first isolator, the laser beam amplifier being configured to initially emit the broad spectrum beam and to continuously amplify the specific wavelength beam until the specific wavelength beam becomes a main beam, wherein the broad spectrum beam cannot pass through the first isolator in a reverse direction;
a signal shaper coupled to the laser beam amplifier for half-period filtering the broad-band light beam and the specific wavelength light beam according to a waveform shaping parameter, wherein the waveform shaping parameter has different gain values;
a beam splitter having an input connected to the laser beam amplifier and a first output connected to an interferometer module; and
and the second isolator is connected to the second output end of the beam splitter and the input end of the optical fiber Fabry-Perot tunable filter and is used for outputting the light beam with the specific wavelength and the light beam with the wide frequency spectrum in a single direction.
2. The swept laser light source system of claim 1, wherein the balance detector is coupled to an operation processor for fourier transforming the optical interference waveform signal to obtain a three-dimensional information waveform signal.
3. The system of claim 1, wherein the beam splitter splits the specific wavelength beam with a one-to-one ratio of amounts of light.
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| CN202222948114.1U CN219891059U (en) | 2022-11-02 | 2022-11-02 | Sweep frequency laser light source system with signal shaping function |
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| CN202222948114.1U CN219891059U (en) | 2022-11-02 | 2022-11-02 | Sweep frequency laser light source system with signal shaping function |
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