CN215067435U - Transmitting-receiving coaxial compact laser transmitting-receiving device - Google Patents
Transmitting-receiving coaxial compact laser transmitting-receiving device Download PDFInfo
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- CN215067435U CN215067435U CN202121383571.XU CN202121383571U CN215067435U CN 215067435 U CN215067435 U CN 215067435U CN 202121383571 U CN202121383571 U CN 202121383571U CN 215067435 U CN215067435 U CN 215067435U
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Abstract
The utility model belongs to the technical field of laser transceiver and discloses a coaxial compact laser transceiver for transceiving, which comprises an optical lens, a coupling component, a multimode transceiving optical fiber, a return light dissipater and a multimode optical fiber circulator; the multimode optical fiber circulator comprises three ports, wherein a first port is used as a transmitting end, a third port is used as a receiving end, and a second port is connected with one end of the return light dissipater; the other end of the return light dissipater is connected with a multimode transceiving optical fiber; the coupling assembly is disposed in an optical path between the multimode transceiver fiber and the optical lens. The utility model provides a lower problem of isolation between the transmission port of complicated, multimode fiber optic ring ware and the receiving port of the coaxial dress of laser transceiver among the prior art. The utility model discloses can realize the coaxial receiving and dispatching of laser of high isolation, reduce the device volume.
Description
Technical Field
The utility model belongs to the technical field of laser transceiver, more specifically relates to a coaxial compact laser transceiver of receiving and dispatching.
Background
The laser coaxial installation and adjustment process in the conventional laser device is complex, and the reliability and stability of receiving and transmitting laser are poor. The most important feature of the optical fiber circulator is that the same optical fiber can be used for transmitting and receiving signals, but the optical fiber circulator is usually used in an optical fiber circuit and rarely used in a spatial light path. If the fiber optic circulator is applied to a spatial light path, the following problems occur: when a transmission signal enters an atmospheric medium from an optical fiber medium at a port 2 of the optical fiber circulator, the atmospheric medium reflects part of the signal back into the optical fiber medium to reach a port 3 of the optical fiber circulator due to the abrupt change of the refractive index of the medium, crosstalk is formed, and the isolation between the port 1 and the port 3 of the optical fiber circulator is reduced. For a single-mode optical fiber circulator, the crosstalk between the port 1 and the port 3 caused by the atmospheric reflection is relatively small, the isolation degree is about-40 dB, and the optical fiber circulator can be used in short-distance low-power laser transmission, but cannot be used in a scene with the isolation degree requirement being greater than 40 dB. For the multimode fiber circulator, because the diameter of the multimode fiber core is 5-7 times larger than that of the single mode fiber core, and the area is 30-47 times larger than that of the single mode fiber core, if the multimode fiber circulator is adopted, the intensity of a part of a transmitted signal reflected by an atmospheric medium and returned to the optical fiber medium is greatly increased, so that the isolation between the port 1 and the port 3 is only about-15 dB, and the multimode fiber circulator cannot be applied to the existing space laser transceiving system.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a coaxial compact laser transceiver of receiving and dispatching solves among the prior art the lower problem of isolation between the transmission port and the receiving port of the coaxial dress of laser transceiver's laser and transfers complicacy, multimode fiber optic circulator.
The utility model provides a coaxial compact laser transceiver of receiving and dispatching, include: the optical lens, the coupling component, the multimode transceiving optical fiber, the light returning dissipater and the multimode optical fiber circulator;
the multimode optical fiber circulator comprises three ports, wherein a first port is used as a transmitting end, a third port is used as a receiving end, and a second port is connected with one end of the return light dissipater; the other end of the light return dissipater is connected with the multimode transceiving optical fiber; the coupling assembly is disposed in an optical path between the multimode transceiver fiber and the optical lens;
after being received and converged by the optical lens, the signal laser emitted by the signal laser of the opposite side is reflected to the end face of the multimode transceiving optical fiber by the coupling component and enters the optical fiber for propagation, then the optical signal enters the second port of the multimode optical fiber circulator after passing through the light return dissipater, and finally reaches the third port of the multimode optical fiber circulator to be received by the detector;
the signal laser emitted by the signal laser enters through the first port of the multimode fiber circulator, sequentially passes through the second port of the multimode fiber circulator, the light return dissipater, the multimode transceiving fiber, the coupling assembly and the optical lens and then is emitted to the opposite side.
Preferably, the transmitting and receiving coaxial compact laser transmitting and receiving device further comprises: a camera and a beacon laser; the beacon laser is used for emitting beacon laser, and the camera and the beacon laser are used for achieving light path alignment.
Preferably, the return light dissipater includes: the optical fiber module comprises a first multimode optical fiber, a second multimode optical fiber, a third multimode optical fiber, a first flange and a second flange;
the first flange is used for connecting the first multimode optical fiber and the second multimode optical fiber, and the second flange is used for connecting the second multimode optical fiber and the third multimode optical fiber; the end faces of the first multimode optical fiber, the second multimode optical fiber and the third multimode optical fiber are all in an APC structure.
Preferably, a joint of the first multimode optical fiber and the second multimode optical fiber is coated with a matching paste having the same refractive index as that of the optical fiber core, and a joint of the second multimode optical fiber and the third multimode optical fiber is coated with a matching paste having the same refractive index as that of the optical fiber core.
Preferably, the coupling assembly includes: a first mirror and a second mirror;
the first reflector and the second reflector are used for reflecting the convergent light beam received by the optical lens to the center of the end face of the multimode transceiving optical fiber and reflecting the light beam output by the multimode transceiving optical fiber to the optical lens to be emitted.
Preferably, the coupling assembly includes: the system comprises a first reflector, a galvanometer, a spectroscope, a four-quadrant detector, a signal processing circuit, a single chip microcomputer control board and a galvanometer driving circuit;
the signal laser emitted by the signal laser of the opposite side and the beacon laser emitted by the beacon laser of the opposite side form convergent light after being received by the optical lens, the convergent light is reflected to the mirror surface of the vibrating mirror after passing through the first reflecting mirror and then reflected to the spectroscope by the mirror surface, the signal laser penetrates through the spectroscope and then is incident to the end surface center of the multimode transceiving optical fiber and is coupled into the optical fiber, the beacon laser is incident to the four-quadrant detector after being reflected by the spectroscope, the four-quadrant detector converts an optical signal into an electrical signal and inputs the electrical signal to the signal processing circuit, the signal processing circuit outputs four electrical signals to the singlechip control board, the singlechip control board analyzes and processes the four electrical signals and obtains a light spot position parameter, the light spot position parameter is sent to the vibrating mirror driving circuit, and the light spot position parameter is used as a feedback signal by the vibrating mirror driving circuit, and controlling the mirror surface deflection of the galvanometer to enable the signal laser to be aligned to the center of the end face of the multimode transceiving optical fiber.
Preferably, the camera is a CMOS camera.
Preferably, the galvanometer adopts a voice coil motor type galvanometer.
Preferably, the wavelength of the signal laser is 1064nm or 1550 nm.
Preferably, the wavelength of the beacon laser is 800 nm.
The utility model discloses in the one or more technical scheme that provides, following technological effect or advantage have at least:
in the utility model discloses in, connect the back light dissipator at the second port of multimode fiber circulator, can effectively improve the isolation between the transmission port and the receiving port of multimode fiber circulator. The multimode fiber circulator can realize that the laser can transmit and receive coaxially and share one optical fiber, thereby avoiding the complex installation and adjustment process of laser coaxiality in the conventional laser device and greatly improving the reliability and stability of transmitting and receiving laser. The coupling assembly is used for realizing the return light path, so that the size of the mechanism can be effectively reduced, and the structure is compact. The utility model discloses can realize the coaxial receiving and dispatching of laser of high isolation, reduce the device volume.
Drawings
Fig. 1 is a schematic structural diagram of a coaxial compact laser transceiver for transceiving provided in embodiment 1 of the present invention;
FIG. 2 is a schematic structural diagram of a return light dissipater;
fig. 3 is a schematic structural diagram of a coaxial compact laser transceiver for transceiving provided in embodiment 2 of the present invention.
The system comprises an optical lens 1, a camera 2, a beacon laser 3, a first reflector 4, a second reflector 5, a multimode transceiving optical fiber 6, a light returning dissipater 7, a multimode optical fiber circulator 8, a galvanometer 9, a spectroscope 10, a singlechip control board 11, a four-quadrant detector 12, a signal processing circuit 13 and a galvanometer driving circuit 14.
Detailed Description
In order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.
The utility model provides a coaxial compact laser transceiver of receiving and dispatching, see figure 1, mainly include: the optical lens 1, the coupling component, the multimode transmitting and receiving optical fiber 6, the return light dissipater 7 and the multimode optical fiber circulator 8.
The multimode optical fiber circulator 8 comprises three ports, wherein a first port is used as a transmitting end, a third port is used as a receiving end, and a second port is connected with one end of the return light dissipater 7; the other end of the light returning dissipator 7 is connected with the multimode transceiving optical fiber 6; the coupling assembly is arranged in the optical path between the multimode transceiving optical fiber 6 and the optical lens 1.
After being received and converged by the optical lens 1, the signal laser emitted by the signal laser of the opposite side is reflected to the end face of the multimode transceiving optical fiber 6 by the coupling component and is coupled into the optical fiber for transmission, and the optical signal enters the second port of the multimode optical fiber circulator 8 after passing through the light return dissipater 7 and finally reaches the third port of the multimode optical fiber circulator 8 to be received by the detector.
The signal laser emitted by the signal laser enters through the first port of the multimode fiber circulator 8, and is emitted to the opposite side after sequentially passing through the second port of the multimode fiber circulator 8, the return light dissipater 7, the multimode transceiving fiber 6, the coupling assembly and the optical lens 1.
The utility model discloses a multimode fiber circulator and return light dissipater realize that laser emission and laser receiving share multimode fiber, and multimode receiving and dispatching optic fibre is the access & exit of launching laser and receiving laser, for receiving and dispatching sharing optic fibre, has realized the coaxial receiving and dispatching of laser of high isolation.
In addition, a camera 2 and a beacon laser 3 may also be included; the beacon laser 3 is used for emitting beacon laser with a slightly larger divergence angle, and the camera 2 and the beacon laser 3 are used for realizing light path alignment.
Referring to fig. 1, a signal laser is connected to a transmitting port (i.e., port 01 in fig. 1) of the multimode fiber circulator 8, and a detector is connected to a receiving port (i.e., port 03 in fig. 1) of the multimode fiber circulator 8. The working process of the multimode fiber circulator 8 is as follows: the transmission signal is injected from the 01 port and transmitted out through the 02 port (i.e., the second port). The received signal enters the optical fiber from the 02 port and finally reaches the 03 port, but does not reach the 01 port. The transmitting and receiving signals are all accessed from the 02 port, so that the transmitting and receiving shared optical fiber is achieved, namely, the coaxial transmitting and receiving function of the signals is realized, and the difficulty of coaxial mounting and adjusting of the signal transmitting and receiving of the conventional transmitting and receiving structure is solved. In order to solve the problem that the isolation degree that space laser transmission applied multimode fiber circulator exists is too low, the utility model provides a solution that inserts return light dissipator 7 at the 02 port of multimode fiber circulator 8. After the multimode fiber circulator 8 is connected into the light returning dissipater 7, the isolation between the 01 port and the 03 port can be greater than 45dB, and the multimode fiber circulator can be applied to a plurality of space laser transceiving devices.
In a specific application, the wavelength of the signal laser is 1064nm or 1550 nm. The wavelength of the beacon laser 3 is 800nm, the camera 2 adopts a CMOS camera, the CMOS camera can see the near-infrared laser, and the two are used for aligning targets.
As shown in fig. 2, the return light dissipator 7 includes: a first multimode optical fiber (i.e., multimode optical fiber 1 in fig. 2), a second multimode optical fiber (i.e., multimode optical fiber 2 in fig. 2), a third multimode optical fiber (i.e., multimode optical fiber 3 in fig. 2), a first flange (i.e., flange 1 in fig. 2), and a second flange (i.e., flange 2 in fig. 2); the first flange is used for connecting the first multimode optical fiber and the second multimode optical fiber, and the second flange is used for connecting the second multimode optical fiber and the third multimode optical fiber; the end faces of the first multimode optical fiber, the second multimode optical fiber and the third multimode optical fiber are all in an APC structure. Aiming at the problem that reflected light is easy to generate to return into the optical fiber in a medium mutation area during laser transmission, the end face of the optical fiber adopts an APC structure, namely the end face is not planar but has an 8-degree oblique angle structure, so that the reflected light can be greatly reduced to return into the optical fiber. In addition, a matching paste with the same refractive index as the fiber core is coated at the joint of the first multimode optical fiber and the second multimode optical fiber, and a matching paste with the same refractive index as the fiber core is coated at the joint of the second multimode optical fiber and the third multimode optical fiber. By coating the matching paste with the refractive index same as that of the fiber core of the optical fiber on the two APC optical fiber joints, the medium mutation area at the optical fiber joints can be eliminated, the phenomenon of reflected light return can be greatly reduced, high isolation between the transmitting port and the receiving port of the multimode optical fiber circulator is realized, space laser transmitting and laser receiving share one multimode optical fiber, and coaxial laser transmitting and receiving are realized.
Two specific embodiments are provided on the basis of the above scheme, and the present invention is further explained.
Example 1:
embodiment 1 provides a coaxial compact laser transceiver device for transceiving, and referring to fig. 1, the coupling assembly includes: a first mirror 4 and a second mirror 5. The first reflector 4 and the second reflector 5 are configured to reflect the converging light beam received by the optical lens 1 to the center of the end surface of the multimode transceiving optical fiber 6, and to reflect the light beam output by the multimode transceiving optical fiber 6 to the optical lens 1 for emission.
Embodiment 1 is that by placing the first mirror 4 and the second mirror 5 in the receiving optical path of the optical lens, the incident convergent light is folded back to the center of the end face of the multimode transceiving optical fiber 6, so as to be coupled into the optical fiber and transmitted to the detector at the third port of the multimode optical fiber circulator 8, and such optical path design can reduce the size and volume of the system, and achieve a compact structure.
Example 2:
the long-distance laser atmospheric transmission is influenced by atmospheric turbulence, and the jitter and light intensity flicker of a receiving light spot can be caused, so that the received signal is unstable. Embodiment 2 adds a beam stabilizer to the structure to realize the function of receiving spot stabilization.
The signal laser emitted by the signal laser of the opposite party and the beacon laser emitted by the beacon laser of the opposite party are received by the optical lens 1 to form a convergent light, the convergent light (including the signal laser and the beacon laser) is reflected to the mirror surface of the vibration mirror 9 through the first reflecting mirror 4, the vibration mirror 9 reflects the signal laser and the beacon laser to the spectroscope 10, the signal laser is transmitted by the spectroscope 10 and then enters the center of the end surface of the multimode transceiving optical fiber 6 and is coupled into the optical fiber, the beacon laser is reflected by the spectroscope 10 and then enters the four-quadrant detector 12, the four-quadrant detector 12 converts an optical signal into an electrical signal and inputs the electrical signal to the signal processing circuit 13, the signal processing circuit 13 outputs four electrical signals to the singlechip control board 11, and the singlechip control board 11 analyzes and processes the four electrical signals and obtains a spot position parameter, and then the light spot position parameter is sent to the galvanometer driving circuit 14, the galvanometer driving circuit 14 uses the light spot position parameter as a feedback signal, the mirror deflection of the galvanometer 9 is controlled to enable the signal laser to be aligned to the center of the end face of the multimode transceiving optical fiber 6, the received light enters a third port of the multimode optical fiber circulator 8 through the light return dissipater 7 and is received by a receiving detector, and the receiving and the detection of the laser are completed.
Specifically, the signal processing circuit 13 outputs four photocurrent paths with corresponding intensity according to different quadrant illumination light intensities, which is equivalent to outputting the position of a light spot on the four-quadrant detector 12. The four paths of photoelectric current are processed by the singlechip control board 11 to obtain the spot position (coordinate) parameters, and the galvanometer driving circuit 14 controls the galvanometer 9 to deflect at a proper angle by taking the parameters as feedback signals.
The galvanometer can be divided into a piezoelectric ceramic type, a voice coil motor type and a mechanical rotating mirror type, and has advantages and disadvantages. The utility model provides a mirror that shakes adopts the voice coil motor type mirror that shakes, it has the characteristics that the pivot angle scope is big, the cost is lower than piezoceramics.
The embodiment of the utility model provides a pair of coaxial compact laser transceiver of receiving and dispatching includes following technological effect at least:
(1) the utility model discloses a multimode fiber circulator can realize coaxial and the receiving and dispatching sharing optic fibre of laser receiving and dispatching, has removed the coaxial complicated installation and debugging process of laser among the conventional laser device from, can improve the reliability and the stability of receiving and dispatching laser by a wide margin.
(2) The utility model discloses connect back light dissipator at multimode fiber circulator's second port, can effectively improve multimode fiber circulator's emission port and receive the isolation between the port.
(3) The utility model discloses a coupling subassembly realizes the light path of turning back, can effectively reduce the mechanism size, realizes compact structure.
(4) The diameter of the multimode fiber core is 5-7 times larger than that of the single-mode fiber core, and the area of the multimode fiber core is 30-47 times larger than that of the single-mode fiber core, so that the receiving optical power of the multimode fiber circulator is 30-47 times larger than that of the single-mode fiber circulator, and the receiving efficiency and stability of laser are greatly improved.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the examples, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the scope of the claims of the present invention.
Claims (10)
1. A transceiving coaxial compact laser transceiving device, comprising: the optical lens, the coupling component, the multimode transceiving optical fiber, the light returning dissipater and the multimode optical fiber circulator;
the multimode optical fiber circulator comprises three ports, wherein a first port is used as a transmitting end, a third port is used as a receiving end, and a second port is connected with one end of the return light dissipater; the other end of the light return dissipater is connected with the multimode transceiving optical fiber; the coupling assembly is disposed in an optical path between the multimode transceiver fiber and the optical lens;
after being received and converged by the optical lens, the signal laser emitted by the signal laser of the opposite side is reflected to the end face of the multimode transceiving optical fiber by the coupling component and enters the optical fiber for propagation, then the optical signal enters the second port of the multimode optical fiber circulator after passing through the light return dissipater, and finally reaches the third port of the multimode optical fiber circulator to be received by the detector;
the signal laser emitted by the signal laser enters through the first port of the multimode fiber circulator, sequentially passes through the second port of the multimode fiber circulator, the light return dissipater, the multimode transceiving fiber, the coupling assembly and the optical lens and then is emitted to the opposite side.
2. The transceiving coaxial compact laser transceiving device according to claim 1, further comprising: a camera and a beacon laser; the beacon laser is used for emitting beacon laser, and the camera and the beacon laser are used for achieving light path alignment.
3. The transceiving coaxial compact laser transceiving device of claim 1, wherein the return light dissipater comprises: the optical fiber module comprises a first multimode optical fiber, a second multimode optical fiber, a third multimode optical fiber, a first flange and a second flange;
the first flange is used for connecting the first multimode optical fiber and the second multimode optical fiber, and the second flange is used for connecting the second multimode optical fiber and the third multimode optical fiber; the end faces of the first multimode optical fiber, the second multimode optical fiber and the third multimode optical fiber are all in an APC structure.
4. The transceiving coaxial compact laser transceiving device according to claim 3, wherein a joint of the first multimode optical fiber and the second multimode optical fiber is coated with a matching paste having a refractive index equal to that of a fiber core, and a joint of the second multimode optical fiber and the third multimode optical fiber is coated with a matching paste having a refractive index equal to that of a fiber core.
5. The transceiving coaxial compact laser transceiving device of claim 1 or 2, wherein the coupling assembly comprises: a first mirror and a second mirror;
the first reflector and the second reflector are used for reflecting the convergent light beam received by the optical lens to the center of the end face of the multimode transceiving optical fiber and reflecting the light beam output by the multimode transceiving optical fiber to the optical lens to be emitted.
6. The transceiving coaxial compact laser transceiving device of claim 2, wherein the coupling assembly comprises: the system comprises a first reflector, a galvanometer, a spectroscope, a four-quadrant detector, a signal processing circuit, a single chip microcomputer control board and a galvanometer driving circuit;
the signal laser emitted by the signal laser of the opposite side and the beacon laser emitted by the beacon laser of the opposite side form convergent light after being received by the optical lens, the convergent light is reflected to the mirror surface of the vibrating mirror after passing through the first reflecting mirror and then reflected to the spectroscope by the mirror surface, the signal laser penetrates through the spectroscope and then is incident to the end surface center of the multimode transceiving optical fiber and is coupled into the optical fiber, the beacon laser is incident to the four-quadrant detector after being reflected by the spectroscope, the four-quadrant detector converts an optical signal into an electrical signal and inputs the electrical signal to the signal processing circuit, the signal processing circuit outputs four electrical signals to the singlechip control board, the singlechip control board analyzes and processes the four electrical signals and obtains a light spot position parameter, the light spot position parameter is sent to the vibrating mirror driving circuit, and the light spot position parameter is used as a feedback signal by the vibrating mirror driving circuit, and controlling the mirror surface deflection of the galvanometer to enable the signal laser to be aligned to the center of the end face of the multimode transceiving optical fiber.
7. The transceiving coaxial compact laser transceiving apparatus according to claim 2, wherein the camera employs a CMOS camera.
8. The transceiver coaxial compact laser transceiver of claim 6, wherein the galvanometer is a voice coil motor type galvanometer.
9. The transceiving coaxial compact laser transceiving device according to claim 1, wherein the signal laser has a wavelength of 1064nm or 1550nm band.
10. The transceiving coaxial compact laser transceiving apparatus according to claim 2, wherein the beacon laser has a wavelength of 800nm band.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121383571.XU CN215067435U (en) | 2021-06-22 | 2021-06-22 | Transmitting-receiving coaxial compact laser transmitting-receiving device |
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| CN202121383571.XU CN215067435U (en) | 2021-06-22 | 2021-06-22 | Transmitting-receiving coaxial compact laser transmitting-receiving device |
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