CN103401610A - Differential-type circularly-polarized laser carrier communication system - Google Patents
Differential-type circularly-polarized laser carrier communication system Download PDFInfo
- Publication number
- CN103401610A CN103401610A CN2013103393046A CN201310339304A CN103401610A CN 103401610 A CN103401610 A CN 103401610A CN 2013103393046 A CN2013103393046 A CN 2013103393046A CN 201310339304 A CN201310339304 A CN 201310339304A CN 103401610 A CN103401610 A CN 103401610A
- Authority
- CN
- China
- Prior art keywords
- laser
- modulator
- receiver
- circularly polarized
- lens
- 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.)
- Pending
Links
Images
Abstract
The invention relates to a differential-type circularly-polarized laser carrier communication system, which relates to the field of the laser communication of a free space. The system is mainly composed of a laser transmitting part and a laser receiving part. The laser transmitting part comprises a laser (1), a first beam splitter (2), a first modulator (3), a second modulator (4), a first quarter slide (5), an optical transmitting lens (6) and a signal encoding module; and the laser receiving part comprises an optical receiving lens (7), a second quarter slide (8), a second beam splitter (9), a first receiver (10), a second receiver (11) and a signal decoding module. The circularly-polarized laser is used as an information carrier, and a differential method is used for modulation and receiving, so that the interference resistance of the laser in the long-distance transmission in the atmosphere can be greatly improved.
Description
Technical field
The present invention is mainly used in free space laser communications field, relates to a kind of differential type circularly polarized laser carrier communication system.
Background technology
Free space laser communication has the advantage of microwave communication and optical fiber communication concurrently, also possesses simultaneously that message capacity is large, good confidentiality and set up simple advantage, has become the development trend in future communications field.Lot of domestic and foreign R﹠D institution has carried out a large amount of research work for the development of laser carrier communication field, but laser signal is in the atmospheric channel transmitting procedure, due to the impact that is subject to the factors such as atmospheric turbulance and background noise, cause communication efficiency greatly to reduce, greatly limited popularization and the application of free space optical communication technology.
Summary of the invention
In order to solve laser signal that prior art exists in the atmospheric channel transmitting procedure, due to the impact that is subject to the factors such as atmospheric turbulance and background noise, cause communication efficiency greatly to reduce, greatly limit the technical problem of popularization and the application of free space optical communication technology, the invention provides a kind of differential type circularly polarized laser carrier communication system.
The technical scheme that technical solution problem of the present invention is taked is as follows:
differential type circularly polarized laser carrier communication system comprises: Laser emission end and laser pick-off end, and described Laser emission end comprises laser, the first beam splitter, the first modulator, the second modulator, the first quarter wave plate, optical emitting camera lens and Signal coding module, described laser pick-off end comprises that optics receives camera lens, the second quarter wave plate, the second beam splitter, the first receiver, the second receiver and signal decoding module, at transmitting terminal, the laser that laser sends is divided into two beam energies through the first beam splitter and equates and the orthogonal linearly polarized light in polarization direction, two bunch polarised lights are coupled to respectively in the first modulator and the second modulator by optical fiber, when sending binary one, and the first modulator Output of laser, when sending Binary Zero, the second modulator Output of laser, communication signal sends to respectively in the first modulator and the second modulator after the Signal coding module, laser vertical through the first modulators modulate incides the first quarter wave plate, be converted to left circularly polarized light, laser vertical through the second modulators modulate incides the first quarter wave plate, is converted to right-circularly polarized light, and then left circularly polarized light and right-circularly polarized light are closed bundle, collimated, expand rear emission by the optical emitting camera lens, at receiving terminal, optics receives camera lens left circularly polarized light and the right-circularly polarized light by the emission of optical emitting camera lens of its reception is sent to the second quarter wave plate, the second quarter wave plate sends to the second beam splitter after two light beams are converted to the two orthogonal linearly polarized lights in bundle polarization direction, the second beam splitter sends to respectively the first receiver and the second receiver after two bunch polarised lights are separated, the two bunch polarised lights that the first receiver and the second receiver will receive send to the signal decoding module, the two-beam signal is carried out filtering to the signal decoding module and demodulation obtains by the communication signal of carrier wave.
The modulation of laser and receive mode: establish on the first receiver of receiving terminal and obtain light intensity signal i
1, obtain light intensity signal i on the second receiver
2, when sending binary one, system only sends left circularly polarized light, and only have the first receiver to receive light intensity signal this moment, therefore the differential signal i=i of output
1-i
20, representative receives binary one; When sending binary zero, system only sends right-circularly polarized light, and only have the second receiver to receive light intensity signal this moment, therefore the differential signal i=i of output
1-i
2＜0, representative receives binary zero.In practical application, the signal of two receiver outputs also comprises ambient noise signal and receiver internal noise signal, and therefore two kinds of noise signal approximately equals are eliminated it when doing difference output.
The invention has the beneficial effects as follows: this system adopts the circularly polarized light that has reduction communication noise superiority in the space optical communication transmission as the communication carrier, has improved the antijamming capability of laser communication in the transmission of atmosphere medium and long distance; Adopt simultaneously difference method to modulate and receive, background noise is eliminated, reduced the communication error rate; Adopt the mode of external modulation, modulation rate is high, with existing optical-fibre communications, good compatibility is arranged, and can take full advantage of the mature technology of existing fiber communication.
Description of drawings
Fig. 1 is the composition frame chart of differential type circularly polarized laser carrier communication system of the present invention;
Fig. 2 is the Laser emission end structure schematic diagram in the present invention;
Fig. 3 is the Laser emission end light path schematic diagram in the present invention;
Fig. 4 is the laser pick-off end structure schematic diagram in the present invention;
Fig. 5 is the laser pick-off end light path schematic diagram in the present invention.
Embodiment
Below in conjunction with accompanying drawing, the inventive method is described in further detail.
As shown in Figures 1 to 5, differential type circularly polarized laser carrier communication system of the present invention comprises: Laser emission end and laser pick-off end, described Laser emission end comprise laser 1, the first beam splitter 2, the first modulator 3, the second modulator 4, the first quarter wave plate 5, optical emitting camera lens 6 and Signal coding module; Described laser pick-off end comprises that optics receives camera lens 7, the second quarter wave plate 8, the second beam splitter 9, the first receiver 10, the second receiver 11 and signal decoding module.The first beam splitter 2 comprises the first polarization splitting prism 2-1, the first coupling fiber lens 2-2 and the second coupling fiber lens 2-3; The laser that laser 1 sends is divided into two beam energies through the first polarization splitting prism 2-1 and equates and the orthogonal linearly polarized light in polarization direction, a branch ofly through the first coupling fiber lens 2-2, enter the first modulator 3, another bundle enters the second modulator 4 through the second coupling fiber lens 2-3.The second beam splitter 9 comprises the second polarization splitting prism 9-1, the first convergent lens 9-2 and the second convergent lens 9-3; The two bundle polarization direction orthogonal linearly polarized lights that obtain through the second quarter wave plate 8 are after the second polarization splitting prism 9-1 separates, a branch ofly enter the first receiver 10 after the first convergent lens 9-2 assembles, another bundle enters the second receiver 11 after the second convergent lens 9-3 assembles.
The structure of Laser emission end specifically as shown in Figure 2, in figure, select in atmospheric window by the optical maser wavelength of laser 1, and with the laser modulator wavelength, be complementary.at first regulate laser beam and the first polarization splitting prism 2-1(PBS) incident angle of reflecting surface, obtain laser P1 and P2 that two beam energies equate, by the character of polarization splitting prism as can be known, P1 and P2 are the two orthogonal linearly polarized lights in bundle polarization direction, be respectively P light and S light, as shown in Figure 2, P1(P light) polarization direction is parallel with paper, P2(S light) polarization direction is vertical with paper, P1 enters the input optical fibre of the first modulator 3 through the first coupling fiber lens 2-2, P2 enters the input optical fibre of the second modulator 4 through the second coupling fiber lens 2-3, 4 pairs two bundle laser of the first modulator 3 and the second modulator are modulated, when sending binary one, only have the first modulator 3 Output of lasers, when sending binary zero, only have the second modulator 4 Output of lasers, the first modulator 3 and the second modulator 4 through optical fiber with Laser output, all optical fiber should be selected polarization maintaining optical fibre herein, the polarization state that guarantees laser does not change in transmission, it is still linearly polarized light, the first modulator 3 and the second modulator 4 impinge perpendicularly on the first quarter wave plate 5 through the laser of optical fiber output after collimation, the angle of the polarization direction of adjustment linearly polarized light and the quick shaft direction of the first quarter wave plate 5, as shown in Figure 2, obtain left-handed and right-circularly polarized light, two bundle circularly polarized lights close bundle through optical emitting camera lens 6, be transmitted into free space after collimating and expanding.
the structure of laser pick-off end specifically as shown in Figure 4, the laser coupled that optics reception camera lens 7 will receive is to the second quarter wave plate 8, make left-handed and right-circularly polarized light be converted to respectively the orthogonal linearly polarized light in polarization direction, adjust the vertical plane angle at 45 ° of reflecting surface in the quick shaft direction of the second quarter wave plate 8 and the second polarization splitting prism 9-1, linearly polarized light P light is separated with S light, respectively P light and S light correspondence are introduced two photelectric receivers through the first convergent lens 9-2 and the second convergent lens 9-3 again, respectively by the first photelectric receiver 10, the second photelectric receiver 11 receives, light path as shown in Figure 5.The signal that receives is carried out difference processing, and establishing on the first photelectric receiver 10 and obtaining light intensity signal is i
1, obtaining light intensity signal on the second photelectric receiver 11 is i
2, the differential signal of output is i=i
1-i
2As i〉0 the time, receive binary one, when i＜0, what receive is binary zero, in practical application, the signal of the first photelectric receiver 10 and the second photelectric receiver 11 outputs also comprises ambient noise signal and receiver internal noise signal, and therefore two kinds of noise signal approximately equals are eliminated it when doing difference output.
Patent of the present invention has adopted circularly polarized laser as information carrier, improved the antijamming capability of laser in the transmission of atmosphere medium and long distance,, by adopting the differential type method to modulate and receive, can further reduce the communication error rate simultaneously, improve the communication system reliability.
Claims (3)
1. differential type circularly polarized laser carrier communication system, it is characterized in that, this system comprises Laser emission end and laser pick-off end, and described Laser emission end comprises laser (1), the first beam splitter (2), the first modulator (3), the second modulator (4), the first quarter wave plate (5), optical emitting camera lens (6) and Signal coding module; Described laser pick-off end comprises that optics receives camera lens (7), the second quarter wave plate (8), the second beam splitter (9), the first receiver (10), the second receiver (11) and signal decoding module;
At transmitting terminal, the laser that laser (1) sends is divided into two beam energies through the first beam splitter (2) and equates and the orthogonal linearly polarized light in polarization direction, two bunch polarised lights are coupled to respectively in the first modulator (3) and the second modulator (4) by optical fiber, when sending binary one, the first modulator (3) Output of laser; When sending Binary Zero, the second modulator (4) Output of laser, communication signal sends to respectively in the first modulator (3) and the second modulator (4) after the Signal coding module, laser vertical through the first modulator (3) modulation incides the first quarter wave plate (5), be converted to left circularly polarized light, laser vertical through the second modulator (4) modulation incides the first quarter wave plate (5), be converted to right-circularly polarized light, then left circularly polarized light and right-circularly polarized light are closed bundle, are collimated, expand rear emission by optical emitting camera lens (6);
at receiving terminal, optics receives camera lens (7) left circularly polarized light and the right-circularly polarized light by optical emitting camera lens (6) emission of its reception is sent to the second quarter wave plate (8), the second quarter wave plate (8) sends to the second beam splitter (9) after two light beams are converted to the two orthogonal linearly polarized lights in bundle polarization direction, the second beam splitter (9) sends to respectively the first receiver (10) and the second receiver (11) after two bunch polarised lights are separated, the two bunch polarised lights that the first receiver (10) and the second receiver (11) will receive send to the signal decoding module, the two-beam signal is carried out filtering to the signal decoding module and demodulation obtains by the communication signal of carrier wave.
2. differential type circularly polarized laser carrier communication system as claimed in claim 1, it is characterized in that, described the first beam splitter (2) comprises the first polarization splitting prism (2-1), the first coupling fiber lens (2-2) and the second coupling fiber lens (2-3); The laser that laser (1) sends is divided into two beam energies through the first polarization splitting prism (2-1) and equates and the orthogonal linearly polarized light in polarization direction, a branch ofly through the first coupling fiber lens (2-2), enter the first modulator (3), another bundle enters the second modulator (4) through the second coupling fiber lens (2-3).
3. differential type circularly polarized laser carrier communication system as claimed in claim 1, is characterized in that, described the second beam splitter (9) comprises the second polarization splitting prism (9-1), the first convergent lens (9-2) and the second convergent lens (9-3); The two bundle polarization direction orthogonal linearly polarized lights that obtain through the second quarter wave plate (8) are after the second polarization splitting prism (9-1) separates, a branch ofly enter the first receiver (10) after the first convergent lens (9-2) is assembled, another bundle enters the second receiver (11) after the second convergent lens (9-3) is assembled.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013103393046A CN103401610A (en) | 2013-08-06 | 2013-08-06 | Differential-type circularly-polarized laser carrier communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013103393046A CN103401610A (en) | 2013-08-06 | 2013-08-06 | Differential-type circularly-polarized laser carrier communication system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103401610A true CN103401610A (en) | 2013-11-20 |
Family
ID=49565161
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013103393046A Pending CN103401610A (en) | 2013-08-06 | 2013-08-06 | Differential-type circularly-polarized laser carrier communication system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103401610A (en) |
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104779997A (en) * | 2014-01-09 | 2015-07-15 | 中国科学院西安光学精密机械研究所 | Polarization modulation space laser communication method based on Stokes parameter identification |
| CN105553550A (en) * | 2015-12-31 | 2016-05-04 | 南京理工大学 | Optical wireless communication device and method applied to turbid media |
| CN104779996B (en) * | 2014-01-09 | 2017-07-28 | 中国科学院西安光学精密机械研究所 | Free space laser communication optics denoising method based on marking of polarization |
| CN109120341A (en) * | 2018-10-30 | 2019-01-01 | 宁波光舟通信技术有限公司 | A kind of signal transmission system |
| CN109120344A (en) * | 2018-10-30 | 2019-01-01 | 宁波光舟通信技术有限公司 | Signal transmitting system between star |
| CN109150317A (en) * | 2018-10-30 | 2019-01-04 | 宁波光舟通信技术有限公司 | A kind of reception system of Communication ray |
| CN109194403A (en) * | 2018-10-30 | 2019-01-11 | 宁波光舟通信技术有限公司 | A kind of Transmission system of Communication ray |
| CN109412678A (en) * | 2018-11-30 | 2019-03-01 | 宁波光舟通信技术有限公司 | A kind of airborne receiving system |
| CN109407306A (en) * | 2018-11-30 | 2019-03-01 | 宁波光舟通信技术有限公司 | A kind of launched by airplane system |
| CN110995357A (en) * | 2019-12-02 | 2020-04-10 | 大连理工大学 | Novel high-robustness underwater optical communication system |
| CN111025827A (en) * | 2018-10-09 | 2020-04-17 | 成都理想境界科技有限公司 | Laser modulation device, laser light source, scanning display device and projection system |
| WO2020133325A1 (en) * | 2018-12-29 | 2020-07-02 | 华为技术有限公司 | Optical transmission device and method |
| EP3772831A1 (en) * | 2019-08-06 | 2021-02-10 | Rockwell Collins, Inc. | System and method for optical polarization division multiplexing |
| CN114374434A (en) * | 2022-01-10 | 2022-04-19 | 北京理工大学 | One-to-many free space laser communication device based on polarized light field and method thereof |
| CN114826417A (en) * | 2022-03-15 | 2022-07-29 | 中国运载火箭技术研究院 | Transmitting terminal, receiving terminal and sharing method for cluster one-to-many information sharing |
| CN114826399A (en) * | 2022-05-03 | 2022-07-29 | 浙江大学湖州研究院 | Circular polarization shift keying optical communication system based on partially coherent light |
| DE102015113524B4 (en) | 2015-08-17 | 2023-12-21 | Pepperl+Fuchs Se | Data light barrier and method for detecting light |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010139345A (en) * | 2008-12-11 | 2010-06-24 | Tokyo Institute Of Technology | Birefringence measurement apparatus |
| CN102236232A (en) * | 2010-04-29 | 2011-11-09 | 中国科学院上海光学精密机械研究所 | Wave-surface differential interference space light demodulator |
| CN102412899A (en) * | 2011-11-21 | 2012-04-11 | 北京交通大学 | Polarization multiplexing millimeter-wave radio-over-fiber (RoF) system with high frequency spectrum utilization rate |
| WO2012130562A1 (en) * | 2011-03-25 | 2012-10-04 | Alcatel Lucent | Method of optical data transmission using polarization division multiplexing |
-
2013
- 2013-08-06 CN CN2013103393046A patent/CN103401610A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010139345A (en) * | 2008-12-11 | 2010-06-24 | Tokyo Institute Of Technology | Birefringence measurement apparatus |
| CN102236232A (en) * | 2010-04-29 | 2011-11-09 | 中国科学院上海光学精密机械研究所 | Wave-surface differential interference space light demodulator |
| WO2012130562A1 (en) * | 2011-03-25 | 2012-10-04 | Alcatel Lucent | Method of optical data transmission using polarization division multiplexing |
| CN102412899A (en) * | 2011-11-21 | 2012-04-11 | 北京交通大学 | Polarization multiplexing millimeter-wave radio-over-fiber (RoF) system with high frequency spectrum utilization rate |
Non-Patent Citations (1)
| Title |
|---|
| 杨鹏 等: "圆偏振调制激光通信系统设计", 《中国激光》 * |
Cited By (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104779997A (en) * | 2014-01-09 | 2015-07-15 | 中国科学院西安光学精密机械研究所 | Polarization modulation space laser communication method based on Stokes parameter identification |
| CN104779996B (en) * | 2014-01-09 | 2017-07-28 | 中国科学院西安光学精密机械研究所 | Free space laser communication optics denoising method based on marking of polarization |
| CN104779997B (en) * | 2014-01-09 | 2017-09-22 | 中国科学院西安光学精密机械研究所 | The Polarization Modulation laser space communication method recognized based on Stokes parameters |
| DE102015113524B4 (en) | 2015-08-17 | 2023-12-21 | Pepperl+Fuchs Se | Data light barrier and method for detecting light |
| CN105553550A (en) * | 2015-12-31 | 2016-05-04 | 南京理工大学 | Optical wireless communication device and method applied to turbid media |
| CN111025827A (en) * | 2018-10-09 | 2020-04-17 | 成都理想境界科技有限公司 | Laser modulation device, laser light source, scanning display device and projection system |
| CN109120341A (en) * | 2018-10-30 | 2019-01-01 | 宁波光舟通信技术有限公司 | A kind of signal transmission system |
| CN109120344A (en) * | 2018-10-30 | 2019-01-01 | 宁波光舟通信技术有限公司 | Signal transmitting system between star |
| CN109150317A (en) * | 2018-10-30 | 2019-01-04 | 宁波光舟通信技术有限公司 | A kind of reception system of Communication ray |
| CN109194403A (en) * | 2018-10-30 | 2019-01-11 | 宁波光舟通信技术有限公司 | A kind of Transmission system of Communication ray |
| CN109412678A (en) * | 2018-11-30 | 2019-03-01 | 宁波光舟通信技术有限公司 | A kind of airborne receiving system |
| CN109407306A (en) * | 2018-11-30 | 2019-03-01 | 宁波光舟通信技术有限公司 | A kind of launched by airplane system |
| WO2020133325A1 (en) * | 2018-12-29 | 2020-07-02 | 华为技术有限公司 | Optical transmission device and method |
| CN113196692A (en) * | 2018-12-29 | 2021-07-30 | 华为技术有限公司 | Optical transmission apparatus and method |
| CN113196692B (en) * | 2018-12-29 | 2022-11-25 | 华为技术有限公司 | Optical transmission apparatus and method |
| EP3772831A1 (en) * | 2019-08-06 | 2021-02-10 | Rockwell Collins, Inc. | System and method for optical polarization division multiplexing |
| CN110995357A (en) * | 2019-12-02 | 2020-04-10 | 大连理工大学 | Novel high-robustness underwater optical communication system |
| CN114374434A (en) * | 2022-01-10 | 2022-04-19 | 北京理工大学 | One-to-many free space laser communication device based on polarized light field and method thereof |
| CN114826417A (en) * | 2022-03-15 | 2022-07-29 | 中国运载火箭技术研究院 | Transmitting terminal, receiving terminal and sharing method for cluster one-to-many information sharing |
| CN114826399A (en) * | 2022-05-03 | 2022-07-29 | 浙江大学湖州研究院 | Circular polarization shift keying optical communication system based on partially coherent light |
| CN114826399B (en) * | 2022-05-03 | 2023-09-12 | 浙江大学湖州研究院 | Circular polarization shift keying optical communication system based on partially coherent light |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103401610A (en) | Differential-type circularly-polarized laser carrier communication system | |
| CN106161011B (en) | Plug-and-play quantum key distribution system and method based on time-phase coding, sending end and receiving end | |
| CN104459904B (en) | A kind of single fiber bi-directional BOSA structure | |
| CN107872314B (en) | Encoding device, light reflector and quantum key distribution equipment and system based on light reflector | |
| US8855502B2 (en) | Demodulator and optical transceiver | |
| CN103873151B (en) | The spaceborne integrated communication system of a kind of compatible with microwave, laser and quantum communications | |
| CN201541265U (en) | Optical mixer | |
| CN104218998A (en) | Light source module and light receiving-sending device | |
| CN110086544B (en) | Full-optical-intensity and electro-optical-phase hybrid chaotic bidirectional communication system | |
| CN110266386B (en) | Reflective coherent optical communication system combining unidirectional optical signal amplification | |
| CN204906403U (en) | Two modem devices of free space optical communications | |
| CN103532623B (en) | Photo-communication relay transmission method and system based on polarization shift keying modulation | |
| EP3468079A1 (en) | Communication system for two paths of terahertz waves | |
| CN111953472A (en) | Secret communication system based on chaos quadrature amplitude modulation | |
| CN106646757A (en) | Multiplexer and light-combining method thereof | |
| CN104243046A (en) | PDM-MSK modulation and demodulation method for optical communication system | |
| CN208723903U (en) | A kind of 400Gbit/s EML optical transceiver module based on PAM4 modulation | |
| CN108011672A (en) | The detection device and method that compatible polarization demodulation number of photons is differentiated in laser communication | |
| CN107919912B (en) | Same-frequency-band polarization multiplexing spatial laser communication optical transmitter and receiver | |
| CN106464384B (en) | A kind of signal modulation device of optical and system | |
| CN105790846A (en) | Wired-and-wireless-optical-transmission-based double-polarization differential quadrature phase shift keying access apparatus | |
| CN110752882A (en) | Low-bit-error-rate phase coding system and receiving end thereof | |
| CN103257402B (en) | Optical mixer and application optical mixer carry out the method for signal receiving | |
| CN110531469B (en) | Single-fiber bidirectional optical module | |
| CN108631881B (en) | Coherent light device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20131120 |