CN218567610U - Laser ranging system based on optical feedback semiconductor laser dynamics - Google Patents
Laser ranging system based on optical feedback semiconductor laser dynamics Download PDFInfo
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- CN218567610U CN218567610U CN202222442414.2U CN202222442414U CN218567610U CN 218567610 U CN218567610 U CN 218567610U CN 202222442414 U CN202222442414 U CN 202222442414U CN 218567610 U CN218567610 U CN 218567610U
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Abstract
The utility model relates to a laser rangefinder technical field discloses a laser rangefinder system based on optical feedback semiconductor laser dynamics, including semiconductor laser, fiber coupler, photoelectric detector, broadband oscilloscope, optical circulator one, optical circulator two, optical path one, optical path two and adjustable optical attenuator. The invention firstly emits the laser emitted by the semiconductor laser through the optical fiber coupler, the laser is reflected after meeting the target, the reflected optical signal is fed back to the content of the semiconductor laser through another loop, the feedback intensity is adjusted to generate chaotic output, the output chaotic signal is collected by the broadband oscilloscope after being converted by the photoelectric detector, the autocorrelation operation is carried out, the optical feedback delay time can be calculated according to the position of the autocorrelation peak value, and the distance between the optical fiber coupler and the measured target is calculated. The invention only adopts one optical fiber coupler for transmitting and receiving, and has the advantages of simple structure, low cost, easy realization and the like.
Description
Technical Field
The utility model relates to a laser rangefinder technical field, more specifically say, it relates to a laser rangefinder system based on optical feedback semiconductor laser dynamics.
Background
Radar is a sensor which emits electromagnetic waves to a target and receives an echo of the target, so that information such as a distance, a distance change rate (radial velocity), an azimuth, an altitude and the like of the target is obtained, is a main means for people to detect and identify the target in all weather, and is widely applied to military and civil fields. With the increasingly complex detection environment, people have higher and higher requirements on radar detection performance. Because the traditional radar system based on the electronic technology is limited by an electronic bottleneck and is difficult to realize the generation, control and processing of broadband radar signals, the resolution and the response speed of the traditional radar system are difficult to meet the requirements of future applications on high-performance radars. In recent years, laser radars use laser beams as detection signals, and have much higher working frequency than traditional microwaves, so that the laser radars have the advantages of high resolution, good concealment, strong active interference resistance, good low-altitude detection performance, small volume, light weight and the like, and are gradually the hot spots of research in the field.
At present, the detection principle of a laser radar is mainly to transmit a detection signal (laser beam) to a target, then compare a received signal (target echo) reflected from the target with the transmitted signal, and after appropriate processing, obtain relevant information of the target, such as parameters of target distance, azimuth, height, speed, attitude, even shape and the like, so as to detect, track and identify targets such as airplanes and missiles. The method needs to first separate a part of the transmitted signal as a reference signal, then compare and process the received echo signal with the reference signal, and this needs additional optical and electronic devices to complete this part of the work, thereby greatly increasing the volume and cost of the radar system.
Therefore, a laser ranging system based on optical feedback semiconductor laser dynamics is needed to solve the above technical problems.
SUMMERY OF THE UTILITY MODEL
In order to overcome the above-mentioned defect that exists among the prior art, the utility model provides a laser ranging system based on optical feedback semiconductor laser dynamics, at first the laser that sends semiconductor laser launches through fiber coupler, run into target back laser reflection, the light signal that reflects back feeds back semiconductor laser content through another return circuit, adjust feedback intensity, produce chaotic output, chaotic signal of output is gathered by broadband oscilloscope after photoelectric detector conversion, and carry out the autocorrelation operation, according to the position of autocorrelation peak value, can calculate light-emitting feedback delay time, thereby calculate fiber coupler and surveyed the distance between the target. The invention only adopts one optical fiber coupler for transmitting and receiving, compared with the traditional laser radar, the invention reduces the optical and electronic structures of the separation of the transmitted signal and the comparison of the received signal and the transmitted signal, and has the advantages of simple structure, low cost, easy realization and the like.
The above technical object of the present invention can be achieved by the following technical solutions: a laser ranging system based on optical feedback semiconductor laser dynamics, comprising:
the transmitting device comprises a semiconductor laser and an optical fiber coupler, wherein the semiconductor laser is used for generating laser signals, and the optical fiber coupler is used for transmitting or receiving the laser signals;
the data acquisition and processing device comprises a photoelectric detector and a broadband oscilloscope, wherein the photoelectric detector is used for converting optical signals into electric signals, and the broadband oscilloscope is used for acquiring and processing the electric signals output by the photoelectric detector;
the semiconductor laser is connected with an optical fiber coupler, the optical fiber coupler is connected with a photoelectric detector, and the photoelectric detector is connected with a broadband oscilloscope;
the optical fiber coupler adopts a 1 x 2 coupler, namely, the optical fiber coupler is provided with an input port and two output ports, one output port of the optical fiber coupler is connected with the photoelectric detector, and the other output port and the input port of the optical fiber coupler are respectively connected with a first optical circulator and a second optical circulator; and a first optical path and a second optical path are arranged between the first optical circulator and the second optical circulator, the first optical path passes through the optical fiber coupler, the second optical path does not pass through the optical fiber coupler, and the second optical path is provided with an adjustable optical attenuator which is used for adjusting the feedback intensity of light.
Further, the semiconductor laser adopts an electric injection type GaAs diode laser with a double heterostructure.
Further, the first optical circulator and the second optical circulator both have three ports.
To sum up, the utility model discloses following beneficial effect has: the invention firstly emits the laser emitted by the semiconductor laser through the optical fiber coupler, the laser is reflected after encountering a target, the reflected optical signal is fed back to the content of the semiconductor laser through another loop, the feedback intensity is adjusted to generate chaotic output, the output chaotic signal is collected by the broadband oscilloscope after being converted by the photoelectric detector, the autocorrelation operation is carried out, the optical feedback delay time can be calculated according to the position of the autocorrelation peak value, and the distance between the optical fiber coupler and the target to be measured is calculated. The invention only adopts one optical fiber coupler for transmitting and receiving, and has the advantages of simple structure, low cost, easy realization and the like.
Drawings
Fig. 1 is a structural diagram of a laser ranging system based on optical feedback semiconductor laser dynamics according to an embodiment of the present invention;
in the figure: 1. a semiconductor laser; 2. a fiber coupler; 3. a photodetector; 4. a broadband oscilloscope; 5. a first optical circulator; 6. a second optical circulator; 7. a first light path; 8. a second light path; 9. a variable optical attenuator.
Detailed Description
The present invention will be described in further detail with reference to fig. 1.
Example (b): a laser ranging system based on optical feedback semiconductor laser dynamics, as shown in fig. 1, comprising:
the emitting device comprises a semiconductor laser 1 and an optical fiber coupler 2, wherein the semiconductor laser 1 adopts an electric injection GaAs diode laser with a double-heterostructure and is used for generating laser signals, and the optical fiber coupler 2 is used for emitting or receiving the laser signals;
the data acquisition and processing device comprises a photoelectric detector 3 and a broadband oscilloscope 4, wherein the photoelectric detector 3 is used for converting optical signals into electric signals, and the broadband oscilloscope 4 is used for acquiring and processing the electric signals output by the photoelectric detector 3;
the semiconductor laser 1 is connected with an optical fiber coupler 2, the optical fiber coupler 2 is connected with a photoelectric detector 3, and the photoelectric detector 3 is connected with a broadband oscilloscope 4;
the optical fiber coupler 2 adopts a 1 × 2 coupler, namely, the optical fiber coupler is provided with an input port and two output ports, one output port of the optical fiber coupler 2 is connected with the photoelectric detector 3, and the other output port and the input port are respectively connected with a first optical circulator 5 and a second optical circulator 6; a first light path 7 and a second light path 8 are arranged between the first optical circulator 5 and the second optical circulator 6, the first light path 7 passes through the optical fiber coupler 2, the second light path 8 does not pass through the optical fiber coupler 2, an adjustable optical attenuator 9 is arranged on the second light path 8, and the adjustable optical attenuator 9 is used for adjusting the feedback intensity of light.
The first optical circulator 5 and the second optical circulator 6 both have three ports, as shown in fig. 1, the three ports of the first optical circulator 5 and the second optical circulator 6 are respectively labeled, the order of optical transmission of the first optical circulator 5 and the second optical circulator 6 is a port in, a port b out, a port b in and a port c out, and the arrow symbols in fig. 1 indicate the signal transmission direction.
The working principle is as follows: the semiconductor laser 1 emits laser light, the laser light is emitted through one output port of the optical fiber coupler 2 through the first optical path 7, the laser light is reflected after meeting a target object, the laser light is reflected back to the content of the laser light through the second optical path 8, the feedback intensity of the light is adjusted through the adjustable optical attenuator 9, the semiconductor laser 1 generates chaotic output, the output chaotic signal is output to the photoelectric detector 3 through the other output port of the optical fiber coupler 2 for conversion, then the chaotic output signal is collected by the broadband oscilloscope 4 and subjected to autocorrelation operation, the light output feedback delay time is calculated according to the position of an autocorrelation peak value, and the distance between the optical fiber coupler 2 and the target to be measured is further calculated.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications to the present embodiment without inventive contribution as required after reading the present specification, but all of them are protected by patent laws within the scope of the claims of the present invention.
Claims (3)
1. A laser ranging system based on optical feedback semiconductor laser dynamics, comprising:
the device comprises a transmitting device and a receiving device, wherein the transmitting device comprises a semiconductor laser (1) and an optical fiber coupler (2), the semiconductor laser (1) is used for generating a laser signal, and the optical fiber coupler (2) is used for transmitting or receiving the laser signal;
the data acquisition and processing device comprises a photoelectric detector (3) and a broadband oscilloscope (4), wherein the photoelectric detector (3) is used for converting optical signals into electric signals, and the broadband oscilloscope (4) is used for acquiring and processing the electric signals output by the photoelectric detector (3);
the semiconductor laser (1) is connected with an optical fiber coupler (2), the optical fiber coupler (2) is connected with a photoelectric detector (3), and the photoelectric detector (3) is connected with a broadband oscilloscope (4);
the optical fiber coupler (2) adopts a 1 x 2 coupler, namely, the optical fiber coupler is provided with an input port and two output ports, one output port of the optical fiber coupler (2) is connected with the photoelectric detector (3), and the other output port and the input port are respectively connected with a first optical circulator (5) and a second optical circulator (6); be equipped with light path (7) and light path two (8) between light circulator one (5) and light circulator two (6), light path one (7) are through optical fiber coupler (2), light path two (8) do not pass through optical fiber coupler (2), be equipped with adjustable optical attenuator (9) on light path two (8), adjustable optical attenuator (9) are used for adjusting the feedback intensity of light.
2. The laser ranging system based on the dynamics of the optical feedback semiconductor laser as claimed in claim 1, characterized in that the semiconductor laser (1) adopts an electro-injection GaAs diode laser with double heterostructure.
3. A laser ranging system based on optical feedback semiconductor laser dynamics as claimed in claim 1 wherein the first optical circulator (5) and the second optical circulator (6) each have three ports.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202222442414.2U CN218567610U (en) | 2022-09-15 | 2022-09-15 | Laser ranging system based on optical feedback semiconductor laser dynamics |
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| CN202222442414.2U CN218567610U (en) | 2022-09-15 | 2022-09-15 | Laser ranging system based on optical feedback semiconductor laser dynamics |
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| CN202222442414.2U Active CN218567610U (en) | 2022-09-15 | 2022-09-15 | Laser ranging system based on optical feedback semiconductor laser dynamics |
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