CN103532623B - Photo-communication relay transmission method and system based on polarization shift keying modulation - Google Patents
Photo-communication relay transmission method and system based on polarization shift keying modulation Download PDFInfo
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Abstract
The present invention provides a kind of optic communication relay transmission system based on polarization shift keying modulation, and including at least one relay transmission node, described relay transmission node includes signal reception and processes assembly, relay process assembly, signal modulation sending assembly；Invention additionally discloses a kind of photo-communication relay transmission method based on polarization shift keying modulation, the present invention combines the technology of FSO, polarization shift keying modulation, the reception of optical signal and process, it is subject to the less polarization modulation method of atmospheric channel impact by utilization and in signal loading to light carrier, optical signal experienced interference in atmospheric channel will be reduced；By utilizing the loss in transmitting procedure of the relay transmission method compensated optical signal and decay。
Description
Technical field
The present invention relates to a kind of photo-communication relay transmission method and system, relate to a kind of photo-communication relay transmission method based on polarization shift keying modulation being applied to free space and system。
Background technology
Compared with traditional fiber optic communication and microwave communication techniques, free space optical communication technology has many advantages, as: data transfer bandwidth is high；Level security is strong；Wave beam is very narrow and directionality is very good；The terminal unit of space optical communication is little；The luminous power of LASER Light Source is high, volume is also only small, adds maneuverability；Link deployment is efficient and convenient；It is not take up existing frequency spectrum resource；Without electromagnetic interference；Cost is low。Being communicate on open space link yet with free-space optical communication system, its signal necessarily situation by link is affected。The particularly link portions in atmosphere, by the impact of the factors such as atmospheric turbulance, nature bias light, signal is weak, distortion is big, background noise is very strong。Severe channel circumstance causes the increase of the receiver place bit error rate, reduces the performance of whole communication system, limits the extensive use of free space optical communication technology。And loss and decay can be inevitably there is when light beam is propagated in atmospheric channel, cause cannot be carried out long range propagation。
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, the present invention provides a kind of photo-communication relay transmission method based on polarization shift keying modulation being applied to free space and system。Thus solving Problems existing in existing wireless light communication technology: laser beam can be subject to the impact of light intensity attenuation and atmospheric turbulance in atmospheric channel, make the strength reduction of the optical signal that receiving terminal receives and produce light intensity and glimmer at random, cause that the signal error rate received improves, and cannot be carried out long range propagation。
A kind of optic communication relay transmission system based on polarization shift keying modulation, including at least one relay transmission node, described relay transmission node includes signal reception and processes assembly, relay process assembly, signal modulation sending assembly；
The beam collimation that described signal reception process assembly includes being sequentially connected collects battery of lens, filtering apparatus, polariz-ing beam splitting device and is connected to the first Electro-Optical Sensor Set of described polariz-ing beam splitting device, the second Electro-Optical Sensor Set；
Described relay process assembly includes the first signal amplification circuit, secondary signal amplifying circuit, subtraction circuit, data collecting card, described first signal amplification circuit, secondary signal amplifying circuit are connected to described subtraction circuit, described subtraction circuit is connected to described data collecting card, described first signal amplification circuit is for receiving the initial electrical signal sent by described first Electro-Optical Sensor Set, and described secondary signal amplifying circuit is for receiving the initial electrical signal sent by described second Electro-Optical Sensor Set；
Described signal modulation sending assembly includes the laser issue device, deflection device, polarization modulating arrangement, the discharger that are sequentially connected, described polarization modulating arrangement is also attached to described data collecting card, described polarization modulating arrangement is added electrical signals for receiving by what described data collecting card exported, and when the signal of telecommunication passed into is specified half-wave voltage by the polarization angle half-twist of line polarized light。
Further, described beam collimation collects battery of lens and adopts the telescope group of large-aperture long-focus convex lens and short focus convex lens composition；Described filtering apparatus adopts narrow band pass filter。Described polariz-ing beam splitting device adopts polarization beam splitter prism；Described first Electro-Optical Sensor Set, the second Electro-Optical Sensor Set adopt avalanche photodetector module。
Further, described polariz-ing beam splitting device is for being separated from each other S line polarized light mutually orthogonal for polarization direction and P line polarized light, and received by described first Electro-Optical Sensor Set, the second Electro-Optical Sensor Set respectively, and the described S line polarized light light path passed with P line polarized light is identical。
Further, described laser issue device adopts laser light source, and described deflection device adopts optical-fiber type polaroid, and described polarization modulating arrangement adopts polarization rotator, and described discharger adopts optical fiber beam expansion mirror。
Further, described discharger is the collimated light beam of about 1cm for expanding the optical signal in light for diameter, and sends the signal reception process assembly to next via node。
A kind of photo-communication relay transmission method based on polarization shift keying modulation, comprises the steps:
Step A, receive the optical signal that a relay transmission node sends, and be the orthogonal line polarized lights in two kinds of mutual polarization directions of polarization state by described optical signal modulation, and form the initial electrical signal corresponding to two kinds of line polarized lights respectively；
Step B, receive described initial electrical signal, and described initial electrical signal is amplified, shaping, calculus of differences, and undertaken sampling by data collecting card, analog digital conversion, obtain adding electrical signals。
Step C, by described add electrical signals by described polarization modulating arrangement be loaded into by laser issue device and the carrier light that formed of deflection device, form optical signal。
Step D, by described discharger, the optical signal in described step C is launched to next relay transmission node。
Further,
Described step A further includes steps of
Step A1, collected battery of lens by described beam collimation and receive the light beam with optical signal that sends of a upper relay transmission node, light beam is collected and collimates。
Step A2, the bias light filtered by described filtering apparatus in optical signal。
Step A3, above-mentioned steps A2 will be decomposed into S-polarization light and P polarization light through the optical signal of wiping out background light by described polariz-ing beam splitting device。
Step A4, by described first Electro-Optical Sensor Set, the second Electro-Optical Sensor Set, respectively obtain the initial electrical signal corresponding to two-route wire polarized light。
It is further, further comprising the steps of,
Left circularly polarized light in optical signal by transmitting terminal or the incidence of previous relay transmission node is converted into polarized light S light, right-circularly polarized light is converted into polarized light P light；
Line polarized light S light in optical signal is converted into left circularly polarized light, and line polarized light P light is converted into right-circularly polarized light, and sends to next relay transmission node。
Compared to prior art, the technology of the photo-communication relay transmission method based on polarization shift keying modulation of the present invention and system synthesis FSO, polarization shift keying modulation, the reception of optical signal and process, it is subject to the less polarization modulation method of atmospheric channel impact by utilization and in signal loading to light carrier, optical signal experienced interference in atmospheric channel will be reduced；By utilizing the loss in transmitting procedure of the relay transmission method compensated optical signal and decay。The present invention establishes a kind of free-space optical communication system being adapted at the transmission of atmospheric channel middle and long distance, provides basis for long distance laser communication from now on。
Accompanying drawing explanation
Fig. 1 is the structured flowchart of the optic communication relay transmission system based on polarization shift keying modulation of the present invention。
Fig. 2 is the structured flowchart that the signal reception in another embodiment of the present invention processes assembly。
Fig. 3 is the structured flowchart of the signal modulation sending assembly in another embodiment of the present invention。
Detailed description of the invention
Illustrate below in conjunction with accompanying drawing and detailed description of the invention the present invention is further described。
Refer to Fig. 1 to Fig. 3, the invention provides a kind of photo-communication relay transmission method based on polarization shift keying modulation and system。
As it is shown in figure 1, the optic communication relay transmission system based on polarization shift keying modulation of the present invention includes at least one relay transmission node。In atmospheric channel between its transmitting terminal being arranged at optical signal and receiving terminal, and the optical signal repeater sent by transmitting terminal transmits to receiving terminal。
Described relay transmission node includes: signal reception processes assembly 20, relay process assembly 30, signal modulation sending assembly 50。Wherein said signal reception processes assembly 20 and receives the light beam with optical signal sent by previous via node, described signal reception processes assembly 20 and is connected with described relay process assembly 30, described relay process assembly 30 is modulated sending assembly 50 with described signal and is connected, and the optical signal after process is sent to next via node by atmospheric channel by the modulation of described signal with sending assembly。
As it is shown in figure 1, described signal reception process assembly 20 includes beam collimation and collects battery of lens 21, filtering apparatus 22, polariz-ing beam splitting device the 23, first Electro-Optical Sensor Set the 25, second Electro-Optical Sensor Set 27。Beam collimation collects battery of lens 21, filtering apparatus 22, polariz-ing beam splitting device 23 are sequentially connected, and first Electro-Optical Sensor Set the 25, second Electro-Optical Sensor Set 27 is connected to polariz-ing beam splitting device 23。In the present embodiment, described beam collimation collects battery of lens 21 and adopts the telescope group of large-aperture long-focus convex lens and short focus convex lens composition；Described filtering apparatus 22 adopts narrow band pass filter。Described polariz-ing beam splitting device 23 adopts polarization beam splitter prism；Described first Electro-Optical Sensor Set the 25, second Electro-Optical Sensor Set 27 adopts avalanche photodetector module。
Beam collimation collects battery of lens 21 for receiving light beam, line polarized light is collected and collimates。Described filtering apparatus 22 is for by wiping out background light。Heretofore described polariz-ing beam splitting device 23 is for being separated from each other S line polarized light mutually orthogonal for polarization direction and P line polarized light, and amplifies direction outgoing along two differences。S line polarized light separates with P line polarized light and is received by described first Electro-Optical Sensor Set the 25, second Electro-Optical Sensor Set 27 respectively after outgoing, and in the process, the S line polarized light light path passed with P line polarized light is identical。
As it is shown in figure 1, described relay process assembly 30 includes the first signal amplification circuit 31, secondary signal amplifying circuit 32, subtraction circuit 35, data collecting card 37。Wherein said first signal amplification circuit 31 is for receiving the initial electrical signal sent by described first Electro-Optical Sensor Set 25, and described secondary signal amplifying circuit 32 is for receiving the initial electrical signal sent by described second Electro-Optical Sensor Set 27。
Described first signal amplification circuit 31, secondary signal amplifying circuit 32 are connected to described subtraction circuit 35, and described subtraction circuit 35 is connected to described data collecting card 37。Described first signal amplification circuit 31, secondary signal amplifying circuit 32 are amplified and shaping for the initial electrical signal received, and described subtraction circuit 35 is for carrying out calculus of differences to two path signal, thus the influence of noise reduced in signal。Described data collecting card 37 is for being undertaken sampling and analog digital conversion by the signal of telecommunication after calculus of differences, and output adds electrical signals。
Owing to, in FSO, inevitably there is loss and decay in optical signal after transmitting certain distance。Therefore after transmitting certain distance, by relay process assembly 30 on being demodulated but without the optical signal being subject to too big impact, shaping, amplification, and then send, it is possible to loss and decay to optical signal compensate。
As it is shown in figure 1, described signal modulation sending assembly 50 includes the laser issue device 51, deflection device 52, polarization modulating arrangement 53, the discharger 55 that are sequentially connected。
Described laser issue device 51 is used for launching laser extremely described deflection device 52。The laser that described deflection device 52 sends for laser issue device 51 is converted into line polarized light。Described polarization modulating arrangement 53 is connected to described data collecting card 37, is added electrical signals for receiving by what described data collecting card 37 exported。And line polarized light S light can be converted into the orhtogonal linear polarizaiton light P light of polarization angle half-twist when passing into the signal of telecommunication for specified half-wave voltage, or line polarized light P light is converted into line polarized light S light。The present invention is modulated and sends by utilizing the angle of polarization that line polarized light is positioned on coordinate axes to represent corresponding data mode, is demodulated according to the flashlight received different polarization angle on coordinate axes at receiving terminal。
In the present embodiment, described laser issue device 51 adopts infrared laser light source, and described deflection device 52 adopts optical-fiber type polaroid, described polarization modulating arrangement 53 to adopt polarization rotator, and described discharger 55 adopts optical fiber beam expansion mirror。Described discharger 55 expands as collimated light beam for the optical signal in light, in the present embodiment, it is the collimated light beam of about 1cm that optical signal in light is expanded as diameter by described discharger 55, and sends the signal reception process assembly 20 to next via node。
The present invention also discloses a kind of photo-communication relay transmission method based on polarization shift keying modulation。
The photo-communication relay transmission method based on polarization shift keying modulation of the present invention utilizes two kinds of polarization states of linear polarization represent two kinds of data modes and carry out coded modulation。Two kinds of polarization states include polarization direction, and to be positioned at coordinate axes one or three quadrant and coordinate axes be that the line polarized light S light of 45° angle, polarization direction are positioned at coordinate axes two four-quadrant and coordinate axes is the line polarized light P light of 45 °。
In atmospheric channel transmitting procedure, external disturbance is only small on the impact of the polarization state of optical signal, it is possible to distance remains unchanged。At receiving terminal place, it is demodulated according to the polarization state of flashlight, it is possible to recover the information of transmission。The impact of optical signal can well be suppressed by such atmospheric channel。
The described photo-communication relay transmission method based on polarization shift keying modulation comprises the steps:
Step A, receive the light beam with optical signal that a relay transmission node sends, and be the orthogonal line polarized lights in two kinds of mutual polarization directions of polarization state by the described beam modulation with optical signal, and form the initial electrical signal corresponding to two kinds of line polarized lights respectively。Two kinds of line polarized lights corresponding phase difference state 0, phase contrast state π respectively。
Further include steps of in this step
Step A1, collected battery of lens 21 by described beam collimation and receive the light beam with optical signal that a upper relay transmission node sends, light beam is collected and collimates。
Step A2, filter the bias light in optical signal by described filtering apparatus 22。
Step A3, above-mentioned steps A2 will be decomposed into S-polarization light and P polarization light through the optical signal of wiping out background light by described polariz-ing beam splitting device 23。
Step A4, by described first Electro-Optical Sensor Set the 25, second Electro-Optical Sensor Set 27, respectively obtain the initial electrical signal corresponding to two-route wire polarized light。
Step B, receive described initial electrical signal, and described initial electrical signal is amplified, shaping, calculus of differences, and undertaken sampling by data collecting card 37, analog digital conversion, obtain adding electrical signals。
Step C, by described add electrical signals by described polarization modulating arrangement 53 be loaded into by laser issue device 51 and the carrier light that formed of deflection device 52, form optical signal。
Step D, by described discharger, the optical signal in described step C is launched to next relay transmission node。
Heretofore described polarization shift keying modulator approach can be designed to circular polarization shift-keying modulation method, namely utilizes left-handed, two kinds of polarization states of dextrorotation of circularly polarized light to represent " 0 ", " 1 " signal。As shown in Figures 2 and 3, in another embodiment of the invention, described signal reception process assembly 60 include beam collimation with collect battery of lens 61, filtering apparatus 62, polariz-ing beam splitting device the 63, first Electro-Optical Sensor Set the 65, second Electro-Optical Sensor Set 67。Described signal reception processes assembly 60 and is additionally provided with the first quarter-wave plate 69。Described first quarter-wave plate 69 is arranged between described filtering apparatus 62 and described polariz-ing beam splitting device 63。
Described signal modulation sending assembly 70 includes the laser issue device 71, deflection device 72, polarization modulating arrangement 73, the discharger 75 that are sequentially connected。Described signal modulation sending assembly 70 is additionally provided with the second quarter-wave plate 79。Described second quarter-wave plate 79 is connected to described discharger 75。
The described optic communication relay transmission system method based on circular polarization shift-keying modulation further includes steps of
By described first quarter-wave plate 69, the left circularly polarized light in the optical signal by transmitting terminal or the incidence of previous relay transmission node is converted into-45 ° of line polarized lights, right-circularly polarized light is converted into 45 ° of line polarized lights, and sends to polariz-ing beam splitting device 63；
By described second quarter-wave plate 79 ,-45 ° of polarized light in optical signal being converted into left circularly polarized light, 45 ° of line polarized lights are converted into right-circularly polarized light, and send to next relay transmission node。
The polarization state adopting circularly polarized light in the present embodiment represents the data mode transmitted, there is certain differential seat angle in the change in coordinate axis direction that can allow transmitting terminal and receiving terminal, simultaneously the additive phase state of atmospheric turbulance on the polarization state of circularly polarized light without impact, it is possible to better ensure that the correctness of transmission data。
Photo-communication relay transmission method based on polarization shift keying modulation and the system of the present invention adopt the different polarization states of line polarized light to be encoded transmission information, in atmospheric channel, polarization state can remaining unchanged of distance, therefore to be subject to the impact of atmospheric channel only small for the method, it is ensured that the accuracy of transmission information。For general spatial optical communication transmission method, the method that present invention employs relay transmission, compensate for loss and decay that in free space, the optical signal of transmission will necessarily occur, add the coverage of communications。Compared with prior art, the present invention can effectively suppress the atmospheric turbulance impact on signal, hence it is evident that reduces the bit error rate of system and improves communications distance。
Above content is in conjunction with concrete preferred implementation further description made for the present invention, it is impossible to assert that specific embodiment of the invention is confined to these explanations。For general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, it is also possible to make some simple deduction or replace, protection scope of the present invention all should be considered as belonging to。
Claims (5)
1. the optic communication relay transmission system based on polarization shift keying modulation, it is characterised in that: including at least one relay transmission node, described relay transmission node includes signal reception and processes assembly, relay process assembly, signal modulation sending assembly；
The beam collimation that described signal reception process assembly includes being sequentially connected collects battery of lens, filtering apparatus, polariz-ing beam splitting device and is connected to the first Electro-Optical Sensor Set of described polariz-ing beam splitting device, the second Electro-Optical Sensor Set；
Described relay process assembly includes the first signal amplification circuit, secondary signal amplifying circuit, subtraction circuit, data collecting card, described first signal amplification circuit, secondary signal amplifying circuit are connected to described subtraction circuit, described subtraction circuit is connected to described data collecting card, described first signal amplification circuit is for receiving the initial electrical signal sent by described first Electro-Optical Sensor Set, and described secondary signal amplifying circuit is for receiving the initial electrical signal sent by described second Electro-Optical Sensor Set；
Described signal modulation sending assembly includes the laser issue device, deflection device, polarization modulating arrangement, the discharger that are sequentially connected, described polarization modulating arrangement is also attached to described data collecting card, described polarization modulating arrangement is added electrical signals for receiving by what described data collecting card exported, and when the signal of telecommunication passed into is specified half-wave voltage by the polarization angle half-twist of line polarized light。
2. according to claim 1 based on the optic communication relay transmission system of polarization shift keying modulation, it is characterized in that: described polariz-ing beam splitting device is for being separated from each other S line polarized light mutually orthogonal for polarization direction and P line polarized light, and received by described first Electro-Optical Sensor Set, the second Electro-Optical Sensor Set respectively, and the described S line polarized light light path passed with P line polarized light is identical。
3. according to claim 1 based on the optic communication relay transmission system of polarization shift keying modulation, it is characterized in that: described discharger is the collimated light beam of about 1cm for expanding the optical signal in light for diameter, and send the signal reception process assembly to next via node。
4. the photo-communication relay transmission method based on polarization shift keying modulation, it is characterised in that: comprise the steps:
Step A, receive the optical signal that a relay transmission node sends, and be the orthogonal line polarized lights in two kinds of mutual polarization directions of polarization state by described optical signal modulation, and form the initial electrical signal corresponding to two kinds of line polarized lights respectively；
Step B, receive described initial electrical signal, and described initial electrical signal is amplified, shaping, calculus of differences, and undertaken sampling by data collecting card, analog digital conversion, obtain adding electrical signals；
Step C, by described add electrical signals by described polarization modulating arrangement be loaded into by laser issue device and the carrier light that formed of deflection device, form optical signal；
Step D, by discharger, the optical signal in described step C is launched to next relay transmission node。
5. according to claim 4 based on the photo-communication relay transmission method of polarization shift keying modulation, it is characterised in that:
Described step A further includes steps of
Step A1, collected battery of lens by beam collimation and receive the light beam with optical signal that sends of a upper relay transmission node, light beam is collected and collimates；
Step A2, the bias light filtered by filtering apparatus in optical signal；
Step A3, above-mentioned steps A2 will be decomposed into S-polarization light and P polarization light through the optical signal of wiping out background light by polariz-ing beam splitting device；
Step A4, by the first Electro-Optical Sensor Set, the second Electro-Optical Sensor Set, respectively obtain the initial electrical signal corresponding to two-route wire polarized light。
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| CN104253653B (en) * | 2014-09-19 | 2017-02-15 | 哈尔滨工业大学深圳研究生院 | Quaternary light polarization encoding and self-calibration wireless optical communication system and method |
| CN108322262A (en) * | 2017-01-18 | 2018-07-24 | 深圳清华大学研究院 | Radio optical communication system |
| CN107966415A (en) * | 2017-11-20 | 2018-04-27 | 哈尔滨工业大学 | The contactless online test method and device of SiC oxidation reactions |
| CN111565070A (en) * | 2019-05-29 | 2020-08-21 | 南京大学 | Free space optical signal transmission method and free space optical signal transmission device |
| CN112564793B (en) * | 2020-12-07 | 2022-04-12 | 长春理工大学 | One-point multiple access space laser communication networking terminal and system |
| 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 |
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| CN101299101A (en) * | 2008-06-17 | 2008-11-05 | 哈尔滨工业大学深圳研究生院 | Wireless light communication modulating method and modulating signal transmitting/receiving device |
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| CN101299101A (en) * | 2008-06-17 | 2008-11-05 | 哈尔滨工业大学深圳研究生院 | Wireless light communication modulating method and modulating signal transmitting/receiving device |
| CN102075288A (en) * | 2010-12-20 | 2011-05-25 | 复旦大学 | Network-code-based free-space optical cooperative relay communication method |
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