CN107592157B - Device and method for correcting wave front distortion in optical reverse modulation - Google Patents
Device and method for correcting wave front distortion in optical reverse modulation Download PDFInfo
- Publication number
- CN107592157B CN107592157B CN201710764955.8A CN201710764955A CN107592157B CN 107592157 B CN107592157 B CN 107592157B CN 201710764955 A CN201710764955 A CN 201710764955A CN 107592157 B CN107592157 B CN 107592157B
- Authority
- CN
- China
- Prior art keywords
- light
- brillouin scattering
- stimulated brillouin
- optical
- modulation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
The invention discloses a device for correcting wavefront distortion in optical reverse modulation, which comprises an active end and a passive end which are connected through a light path; the invention also discloses a method for correcting wavefront distortion in optical reverse modulation by using the device, wherein a convex lens at a passive end receives a wavefront distortion light beam, the light beam is focused to the stimulated Brillouin scattering pool, the light beam and a liquid medium in the stimulated Brillouin scattering pool interact to generate reverse conjugate light of the distortion light beam, a modulation signal is loaded on the light intensity of the reverse conjugate light, and the phase conjugate distortion and the wavefront distortion can be mutually counteracted in the process of returning the reverse conjugate light along an original light path, so that the wavefront phase is restored to an initial state, and the compensation of the wavefront distortion in the optical reverse modulation is realized. The invention relates to a device and a method for correcting wavefront distortion in optical reverse modulation, which solve the problem of wavefront distortion caused by the influence of atmospheric effect in reverse modulation laser communication.
Description
Technical Field
The invention belongs to the technical field of wireless laser communication, relates to a device for correcting wavefront distortion in optical reverse modulation, and further relates to a method for correcting wavefront distortion in optical reverse modulation by using the device.
Background
The reverse modulation laser communication is a novel free space optical communication technology, and compared with a traditional wireless laser communication system, the reverse modulation laser communication system has the advantages of no need of accurate positioning of a transmitting end, strong directivity, high response speed, simple structure, large field angle and the like, and is widely applied.
However, in the backward modulation laser communication system, the laser is affected by various atmospheric effects (turbulence, thermal halo and scattering) during the free channel transmission process, so that the laser energy is lost, the transmission direction is distorted, and the laser wavefront is distorted to cause distortion of the transmission signal, which severely restricts the application of the laser in the backward modulation communication system.
In the existing patents and documents, the adaptive optical system is adopted to correct the atmospheric effect influence, but the adaptive optical system needs a wavefront detection system and a wavefront correction system, has a complex structure and high cost, and is not suitable for industrial application. Therefore, a new method is required to be found to solve the problem of signal distortion caused by wavefront distortion in the process of inverse modulation of laser, and the effectiveness and accuracy of information transmission are improved.
Disclosure of Invention
The invention aims to provide a device for correcting wavefront distortion in optical inverse modulation, which solves the problem of wavefront distortion generated due to the influence of atmospheric effect in inverse modulation laser communication.
It is another object of the present invention to provide a method for correcting wavefront distortion in optical inverse modulation using the above-described apparatus.
The first technical scheme adopted by the invention is that the device for correcting wavefront distortion in optical reverse modulation comprises an active end and a passive end;
the driving end comprises an Nd YAG laser and a polaroid arranged at the emitting end of the Nd YAG laser; the photoelectric detector is arranged close to the Nd-YAG laser and is sequentially connected with the FPGA demodulation board and the computer A;
the passive end comprises a convex lens, and the left side and the right side of the convex lens are respectively provided with an electro-optical modulator EOM and a stimulated Brillouin scattering pool; the electro-optical modulator EOM is sequentially connected with the FPGA modulation board and the computer B; a liquid medium FC-72 is filled in the stimulated Brillouin scattering pool;
the center connecting line of the YAG laser and the polaroid is parallel to the center connecting line of the photoelectric detector and the EOM, and the extension lines of the two center connecting lines pass through the convex lens; the polaroid and the convex lens are connected through an optical path, and the electro-optical modulator EOM and the photoelectric detector are connected through an optical path.
The first technical scheme adopted by the invention is also characterized in that:
the diameter of an emergent light spot of the Nd-YAG laser is 2-4 mm.
The focal length of the convex lens is 5 cm-20 cm.
The inner cavity of the stimulated Brillouin scattering pool is a polytetrafluoroethylene cylindrical cavity.
The second technical scheme adopted by the invention is that the method for correcting wavefront distortion in optical inverse modulation by using the device is implemented according to the following steps:
step 1: YAG laser beam enters into polaroid, which changes the beam into vertical polarized light to reach convex lens in free space channel;
step 2: after the step 1, focusing the emitted light beams to a stimulated Brillouin scattering pool by a convex lens, and generating stimulated Brillouin scattering phase conjugate light by a nonlinear effect generated by the interaction of the light beams and a liquid medium FC-72 in the stimulated Brillouin scattering pool;
and step 3: the computer B serial port sends data, the data is sent into an FPGA modulation board to be processed, modulation signals are loaded to two ends of an electro-optical modulator EOM, meanwhile, stimulated Brillouin scattering phase conjugate light generated in the step 2 reaches the electro-optical modulator EOM through a convex lens, the light intensity of the stimulated Brillouin scattering phase conjugate light changes, and the modulation signals are loaded on the light intensity of the stimulated Brillouin scattering phase conjugate light;
and 4, step 4: and (3) returning the stimulated Brillouin scattering phase conjugate light processed in the step (3) to the photoelectric detector along the original optical path, receiving the optical signal by the photoelectric detector, converting the optical signal into an electrical signal, demodulating the electrical signal by the FPGA demodulation board, reducing the electrical signal into information fed back by the modulation end, and outputting the information through the computer A.
The invention has the beneficial effects that:
(1) the nonlinear phase conjugation technology is applied to a reverse modulation laser communication system, so that the wave front distortion problem generated by the influence of atmospheric effects (turbulence, thermal halo and scattering) in the reverse modulation process of laser can be compensated, and the information transmission efficiency is improved;
(2) compared with a wavefront-free detection system of a self-adaptive optical system, the wavefront-free detection system has the advantages of simple structure and low cost, and is more favorable for the practicability and marketization of a reverse modulation system;
(3) the invention solves the technical problem of signal distortion caused by wavefront distortion in the process of inverse modulation of laser, and improves the effectiveness and accuracy of information transmission.
Drawings
FIG. 1 is a schematic diagram of an apparatus for correcting wavefront distortion in optical inverse modulation according to the present invention.
In the figure, 1, Nd, YAG laser, 2, polaroid, 3, convex lens, 4, stimulated Brillouin scattering pool, 5, electro-optical modulator EOM, 6, FPGA modulation board, 7, computer B, 8, photoelectric detector, 9, FPGA modulation board, 10, computer A, 11, liquid media FC-72, 12, active end, 13, and passive end.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The device for correcting wavefront distortion in optical inverse modulation of the present invention, as shown in fig. 1, includes an active end 12 and a passive end 13 connected by an optical path;
the driving end 12 comprises an Nd YAG laser 1 and a polaroid 2 arranged at the emitting end of the Nd YAG laser 1, and the Nd YAG laser 1 and the polaroid 2 are connected through a light path; the device also comprises a photoelectric detector 8 which is arranged close to the Nd-YAG laser 1, wherein the photoelectric detector 8 is sequentially connected with an FPGA demodulation board 9 and a computer A10 through an electric appliance connecting wire;
the passive end 13 comprises a convex lens 3, the left side and the right side of the convex lens 3 are respectively provided with an electro-optical modulator EOM 5 and a stimulated Brillouin scattering pool 4, and the stimulated Brillouin scattering pool 4, the convex lens 3 and the electro-optical modulator EOM 5 are sequentially connected through an optical path; the electro-optical modulator EOM 5 is sequentially connected with the FPGA modulation board 6 and the computer B7 through an electric appliance connecting line; wherein the stimulated Brillouin scattering pool 4 is filled with a liquid medium FC-7211;
the center connecting line of a YAG laser 1 and a polaroid 2 is parallel to the center connecting line of a photoelectric detector 8 and an electro-optical modulator EOM 5, and the extension lines of the two center connecting lines pass through the convex lens 3; the polaroid 2 is connected with the convex lens 3 through an optical path, and the electro-optical modulator EOM 5 is connected with the photoelectric detector 8 through an optical path.
The invention relates to a device for correcting wave front distortion in optical reverse modulation, which comprises:
the diameter of an emergent light spot of the Nd-YAG laser 1 is 2 mm-4 mm.
The focal length of the convex lens 3 is 5 cm-20 cm.
The inner cavity of the stimulated Brillouin scattering pool 4 is a polytetrafluoroethylene cylindrical cavity.
The smaller the diameter of an emergent light spot of the YAG laser 1 is, the better the effect of the nonlinear optical effect of the light beam in the stimulated Brillouin scattering pool 4 and the liquid medium FC-7211 is; the shorter the focal length of the convex lens 3 is, the larger the energy of the stimulated brillouin scattering-phase conjugate light reflected back from the stimulated brillouin scattering cell 4 is.
The method for correcting the wave front distortion in the optical inverse modulation by using the device comprises the following specific steps:
step 1: YAG laser 1 sends light beam into polaroid 2, polaroid 2 makes the light beam become vertical polarized light, transmit and reach convex lens 3 in the free space channel;
step 2: after the step 1, the emitted light beams are focused to the stimulated Brillouin scattering pool 4 by the convex lens 3, and the light beams interact with the liquid medium FC-7211 in the stimulated Brillouin scattering pool 4 to generate a nonlinear effect to generate stimulated Brillouin scattering phase conjugate light;
and step 3: the computer B7 sends data through a serial port, the data are sent into an FPGA modulation board 6 to be processed, modulation signals are loaded to two ends of an electro-optical modulator EOM 5, meanwhile, stimulated Brillouin scattering phase conjugate light generated in the step 2 reaches the electro-optical modulator EOM 5 through a convex lens 3, the light intensity of the stimulated Brillouin scattering phase conjugate light changes, and the modulation signals are loaded on the light intensity of the stimulated Brillouin scattering phase conjugate light;
and 4, step 4: and (3) the stimulated Brillouin scattering phase conjugate light processed in the step (3) returns to the photoelectric detector (8) along the original optical path, the photoelectric detector (8) receives the optical signal and converts the optical signal into an electric signal, the electric signal is demodulated by the FPGA demodulation board (9) and is restored into information fed back by the modulation end, and the information is output by the computer A10.
Through the steps, the whole inverse modulation optical communication process is realized, information transmission is realized, and the wave front distortion of the light beam in the inverse modulation system is compensated.
The invention relates to a device and a method for correcting wavefront distortion in optical reverse modulation, wherein the working principle is as follows: in the process that the light beam is emitted from the active end 12 to the passive end 13, the wave front distortion of the light beam is caused by the turbulence in the atmospheric channel, the wave front distortion light beam is focused into the stimulated brillouin scattering pool 4 through the convex lens at the passive end 13, and the light interacts with the medium in the stimulated brillouin scattering pool 4 to generate the reverse conjugate light of the distortion light beam. When the reverse conjugate light returns to the atmospheric channel along the original optical path again, the phase conjugate distortion and the wavefront distortion information can be mutually offset, so that the wavefront phase is restored to the initial state, and the compensation of the wavefront distortion is realized.
Compared with the traditional method for correcting the wave front distortion by a self-adaptive optical system, the device and the method for correcting the wave front distortion in the optical reverse modulation not only can well solve the wave front distortion problem in the optical reverse modulation, but also have no wave front detection system, have simple structure and low cost, and are more beneficial to the practicability and marketization of the reverse modulation system.
Claims (2)
1. The device for correcting wave front distortion in optical inverse modulation is characterized by comprising an active end (12) and a passive end (13);
the driving end (12) comprises an Nd-YAG laser (1) and a polaroid (2) arranged at the emitting end of the Nd-YAG laser (1); the device also comprises a photoelectric detector (8) which is arranged close to the Nd-YAG laser (1), the diameter of an emergent light spot of the Nd-YAG laser (1) is 2-4 mm, and the photoelectric detector (8) is sequentially connected with an FPGA (field programmable gate array) demodulation board (9) and a computer A (10);
the passive end (13) comprises a convex lens (3), the focal length of the convex lens (3) is 5-20 cm, and the left side and the right side of the convex lens (3) are respectively provided with an electro-optical modulator EOM (5) and a stimulated Brillouin scattering pool (4); the electro-optical modulator EOM (5) is sequentially connected with an FPGA modulation board (6) and a computer B (7); the stimulated Brillouin scattering pool (4) is filled with a liquid medium FC-72 (11); the inner cavity of the stimulated Brillouin scattering pool (4) is a polytetrafluoroethylene cylindrical cavity;
the center connecting line of the YAG laser (1) and the polaroid (2) is parallel to the center connecting line of the photoelectric detector (8) and the electro-optical modulator EOM (5), and the extension lines of the two center connecting lines pass through the convex lens (3); the polaroid (2) is connected with the convex lens (3) through an optical path, and the electro-optical modulator EOM (5) is connected with the photoelectric detector (8) through an optical path.
2. A method for correcting wavefront distortion in optical inverse modulation using the apparatus of claim 1, comprising the steps of:
step 1: YAG laser (1) sends light beam into a polaroid (2), the polaroid (2) changes the light beam into vertical polarized light, and the vertical polarized light is transmitted in a free space channel and reaches a convex lens (3);
step 2: after the step 1, the emitted light beams are focused to the stimulated Brillouin scattering pool (4) through the convex lens (3), and the light beams interact with the liquid medium FC-72(11) in the stimulated Brillouin scattering pool (4) to generate nonlinear effect to generate stimulated Brillouin scattering phase conjugate light;
and step 3: the computer B (7) sends data through a serial port, the data are sent into an FPGA modulation board (6) to be processed, modulation signals are loaded to two ends of an electro-optical modulator EOM (5), meanwhile, stimulated Brillouin scattering phase conjugate light generated in the step (2) reaches the electro-optical modulator EOM (5) through a convex lens (3), light intensity of the stimulated Brillouin scattering phase conjugate light changes, and the modulation signals are loaded on the light intensity of the stimulated Brillouin scattering phase conjugate light;
and 4, step 4: and (3) returning the stimulated Brillouin scattering phase conjugate light processed in the step (3) to the photoelectric detector (8) along an original optical path, receiving the optical signal by the photoelectric detector (8) and converting the optical signal into an electric signal, demodulating the electric signal by the FPGA demodulation board (9), reducing the electric signal into information fed back by a modulation end, and outputting the information by the computer A (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710764955.8A CN107592157B (en) | 2017-08-30 | 2017-08-30 | Device and method for correcting wave front distortion in optical reverse modulation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710764955.8A CN107592157B (en) | 2017-08-30 | 2017-08-30 | Device and method for correcting wave front distortion in optical reverse modulation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107592157A CN107592157A (en) | 2018-01-16 |
| CN107592157B true CN107592157B (en) | 2020-01-14 |
Family
ID=61051343
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710764955.8A Active CN107592157B (en) | 2017-08-30 | 2017-08-30 | Device and method for correcting wave front distortion in optical reverse modulation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107592157B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108306170B (en) * | 2018-03-12 | 2023-09-15 | 中国科学院苏州生物医学工程技术研究所 | Laser device for optimizing by stimulated Brillouin scattering effect |
| CN109143202B (en) * | 2018-09-21 | 2022-08-26 | 南昌航空大学 | Stimulated Brillouin scattering laser radar system device under simulated ocean turbulence |
| CN109739059B (en) * | 2019-03-07 | 2021-12-24 | 哈尔滨理工大学 | Distortion correction method and device based on Brillouin photoacoustic coupling |
| CN111641459A (en) * | 2020-07-02 | 2020-09-08 | 宁波杜比医疗科技有限公司 | Laser path deviation corrector and modulation method thereof |
| CN114244448B (en) * | 2022-01-27 | 2023-03-14 | 上海交通大学 | Optical millimeter wave/terahertz transmission system and transmission method based on passive phase compensation |
| CN117977356B (en) * | 2024-04-01 | 2024-06-14 | 杭州翎贤科技有限公司 | Apparatus and method for improving beam quality of large aperture laser |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003531515A (en) * | 2000-04-07 | 2003-10-21 | ザ・リージェンツ・オブ・ジ・ユニバーシティ・オブ・カリフォルニア | Remote interrogation high data rate free space laser communication link |
| CN1746758A (en) * | 2005-09-28 | 2006-03-15 | 哈尔滨工业大学 | Two-way laser amplifier of excited Brillonin scattering conjugate mirror with high energy and power |
| CN206060768U (en) * | 2016-07-28 | 2017-03-29 | 杭州摩焕科技有限公司 | A kind of reverse modulation free-space optical communication system based on pseudo conjugation reflector |
-
2017
- 2017-08-30 CN CN201710764955.8A patent/CN107592157B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003531515A (en) * | 2000-04-07 | 2003-10-21 | ザ・リージェンツ・オブ・ジ・ユニバーシティ・オブ・カリフォルニア | Remote interrogation high data rate free space laser communication link |
| CN1746758A (en) * | 2005-09-28 | 2006-03-15 | 哈尔滨工业大学 | Two-way laser amplifier of excited Brillonin scattering conjugate mirror with high energy and power |
| CN206060768U (en) * | 2016-07-28 | 2017-03-29 | 杭州摩焕科技有限公司 | A kind of reverse modulation free-space optical communication system based on pseudo conjugation reflector |
Non-Patent Citations (1)
| Title |
|---|
| "受激布里渊散射补偿激光波前畸变的试验研究";宁永刚等;《激光杂志》;20060104;第26卷(第6期);第27-28页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107592157A (en) | 2018-01-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107592157B (en) | Device and method for correcting wave front distortion in optical reverse modulation | |
| Gomez et al. | Design and demonstration of a 400 Gb/s indoor optical wireless communications link | |
| WO2018040385A1 (en) | Optical transceiver module based on pam4 modulation | |
| CN109682465B (en) | Single-intensity detection self-adaptive optical system under orbital angular momentum space optical communication system | |
| CN102185654A (en) | Laser communication system | |
| CN103401610A (en) | Differential-type circularly-polarized laser carrier communication system | |
| CN105356943A (en) | Laser communication capturing and tracking system and method thereof | |
| CN101369716A (en) | High power light beam coupling semiconductor laser | |
| CN101852924A (en) | Automatic light beam capturing device and light beam capturing method | |
| US20180241475A1 (en) | Wireless optical communication system and optical transmitter thereof | |
| CN107134714A (en) | Laser beam merging apparatus | |
| CN104810721A (en) | High-energy hundreds of picoseconds laser device based on stimulated Brillouin scattering pulse compression | |
| CN103094821A (en) | Regenerative amplification system used for laser amplification | |
| CN113541815B (en) | Resonant optical communication device and method based on gain control | |
| CN104332810A (en) | Pulse-width-adjustable pulsed optical fiber laser device based on broadband seed resource | |
| CN203786388U (en) | Free space optical communication adjustable optical attenuation device | |
| CN102231475A (en) | Method and device for acquiring stimulated Brillouin scattering light with high-fidelity pulse waveforms | |
| CN110556700A (en) | MOPA underwater wireless optical communication transmitting device based on Manchester coding signals | |
| CN110890918B (en) | High-power underwater wireless laser communication system and method based on nonlinear crystal | |
| CN104752941A (en) | Pulse width adjusting fiber laser based on UWB (Ultra Wide Band) light source | |
| CN212572560U (en) | Near field wireless transmission device based on optical communication | |
| CN112583482B (en) | Novel atmosphere laser communication equipment and communication method | |
| Jeon et al. | A unified platform of free-space optics for high-quality video transmission | |
| CN204088863U (en) | Based on the adjustable pulse width pulse optical fiber of ultra broadband light source | |
| CN113219482B (en) | Laser monitoring device capable of improving energy utilization rate and monitoring method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |