CN106788761A - A kind of mixed light coding method and device - Google Patents
A kind of mixed light coding method and device Download PDFInfo
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- CN106788761A CN106788761A CN201611133433.XA CN201611133433A CN106788761A CN 106788761 A CN106788761 A CN 106788761A CN 201611133433 A CN201611133433 A CN 201611133433A CN 106788761 A CN106788761 A CN 106788761A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/501—Structural aspects
- H04B10/503—Laser transmitters
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/508—Pulse generation, e.g. generation of solitons
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
- H04B10/524—Pulse modulation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
- H04B10/548—Phase or frequency modulation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
- H04L1/001—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding applied to control information
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Electromagnetism (AREA)
- Optics & Photonics (AREA)
- Quality & Reliability (AREA)
- Optical Communication System (AREA)
Abstract
The invention belongs to technical field of photo communication, a kind of mixed light coding method and device are specifically provided, its method includes step：1) laser pulse signal is modulated and is encoded by pulse-amplitude modulation mode PAM；2) control information is modulated and is encoded using pulse position modulation mode PPM；3) mixing to laser pulse signal and control information is realized by laser composite wave device；4) mixed signal of laser pulse signal and control information is transmitted to phased laser array through optical fiber link；5) according to the difference of amplitude, laser pulse signal and control information are isolated by amplitude comparator；6) the phase adjustment unit array of phased laser array is controlled by control information, the direction of the launch of laser pulse is controlled.The present invention can not only ensure to use high-power pulse type laser signal in transmitting terminal using mixed light coding method, and the time interval between laser pulse can also be made full use of to improve the alignment precision of aerial array.
Description
Technical field
The invention belongs to technical field of photo communication, and in particular to a kind of mixed light coding method and device.
Background technology
In recent years, laser communication due to capacity is big, the advantage such as electromagnetic compatibility, good confidentiality, flexibility be high, on the one hand
Shortcoming of the fiber optic communication in terms of flexibility is overcome, on the other hand shortcoming of the radio communication in terms of capacity is solved again,
Thus people the most value.
For a laser communication system, the function of emitter is exactly the various forms of information produced by information source
Modulate on light carrier, launched by air or free space.There is big, road of decaying in signal transmission in laser communication
The problems such as footpath loss is big, transmitting antenna is easily influenceed by atmospheric oscillation or atmospheric turbulance.
In order to ensure the accuracy of laser communication, the optical antenna of transmitting terminal can be according to the suitable transmitting of system requirements selection
Angle, but the influence due to atmospheric oscillation etc. to the direction of the launch is, it is necessary to improve the alignment precision of aerial array.In order to increase letter
Number transmission range, reduce influence of the decay to signal transmission, improve the signal to noise ratio of receiving terminal and launch, it is necessary to be improved in transmitting terminal
Power, recently as the development of laser, typically launches laser signal in transmitting terminal by the laser using pulsed
Reached the purpose for increasing transmission power, the laser of pulsed refer to single laser pulse width less than 0.25 second, at interval of
The laser that certain hour just works once, it can utilize instantaneous laser signal to obtain larger power output.
In traditional mobile laser communication, data message and control information are separated from each other, each transmit, and generally adopt
The transmission of data message is realized with laser pulse signal, the accurate alignment of light transmitting antenna is controlled using control information, so
Two sets of different devices are needed to realize the transmission of data message and control information respectively in transmitting terminal, such two covering device is not only
The complexity of system can be increased, and cost can be increased.
The content of the invention
The purpose of the present invention is to overcome above-mentioned problems of the prior art, there is provided a kind of at laser pulse signal interval
Between insert control information mixed light coding method and device, it is possible to use set of device come realize data message and control believe
Transmitted while breath, it is right to be realized by pulse-amplitude modulation (PAM) and pulse position modulation (PPM) using mixed light coded system
The coding and modulation of laser pulse signal and control information, then laser pulse signal and control information are realized by laser composite wave device
Mixing.
The technical scheme is that：A kind of mixed light coding method, comprises the following steps：
(1) laser pulse signal is modulated and is encoded by pulse-amplitude modulation mode PAM；
(2) control information is modulated and is encoded using pulse position modulation mode PPM；
(3) mixing to laser pulse signal and control information is realized by laser composite wave device；
(4) mixed signal of laser pulse signal and control information is transmitted to phased laser array through optical fiber link；
(5) according to the difference of amplitude, laser pulse signal and control information are isolated by amplitude comparator；
(6) the phase adjustment unit array of phased laser array is controlled by control information, the launch party of laser pulse is controlled
To.
Be merged into for control information after being modulated according to PPM modulation mode by the laser composite wave device described in above-mentioned steps (3)
In the pulse spacing of laser pulse signal, the mixing of control information and laser pulse signal is realized.
Amplitude comparator described in above-mentioned steps (5) be according to the amplitude information of control information and laser pulse signal it
Between difference realize the separation of control information and laser pulse signal.
Phase adjustment unit array described in above-mentioned steps (6) be according to control information come realize control each phase list
The phase-shift phase of unit, controls the phase of unit output light-wave in particular directions.
A kind of mixed light code device, including laser pulse device, output end and the PAM modulators of the laser pulse device
Input is connected, and the output end of PAM modulators and the output end of PPM modulation device connect with the input of laser composite wave device respectively
Connect, the output end of laser composite wave device is connected with the input of optical fiber link, the output end of optical fiber link is defeated with amplitude comparator
Enter end connection, the output end of amplitude comparator connect respectively PPM demodulators input and phase adjustment unit array it is defeated
Enter end, the output end of PPM demodulators is connected with the input of phase adjustment unit array, the output end of phase adjustment unit array
Connect the input of collector lens.
Beneficial effects of the present invention：The present invention using mixed light coding method to laser pulse signal add control information it
The phase adjustment unit array of phased laser array can be controlled afterwards, and the direction of micro-adjustment laser pulse signal believes laser pulse
Number launch angle control all the time within the zone of reasonableness of system.Can not only be ensured using mixed light coding method and device
High-power pulse type laser signal is used in transmitting terminal, the phase adjustment unit of phased laser array can also be simultaneously controlled
Array, and then improve the alignment precision of aerial array.
The present invention is described in further details below with reference to accompanying drawing.
Brief description of the drawings
Fig. 1 is PPM modulation mode figure；
Fig. 2 is mixed light code symbols structure；
Fig. 3 is the system block diagram of mixed light code device；
Fig. 4 is method of the present invention operational flowchart；
Fig. 5 is the mixing optical signal of control information and laser pulse signal.
Description of reference numerals：1st, laser pulse device；2nd, PAM modulators；3rd, PPM modulation device；4th, laser composite wave device；5th, optical fiber
Link；6th, amplitude comparator；7th, PPM demodulators；8th, phase adjustment unit array；9th, collector lens.
Specific embodiment
In optic communication, due to path loss, the influence of the factor such as ambient noise, transmitting terminal generally requires to launch higher-wattage
Laser signal realize communication, and need to select suitable launch angle according to system requirements.Typically in order to obtain Gao Gong
The transmission power of rate, in transmitting terminal, we use the generating laser of pulsed, and the laser of pulsed refers to single laser arteries and veins
The laser that width is less than 0.25 second, is just worked once at interval of certain hour is rushed, it can be obtained using instantaneous laser signal
Larger power output is taken, due to there is larger time interval between laser pulse, so we can be in these laser
Control bit is added in the time interval of pulse, so can not only realize transmission power higher and also can at the same realize it is right
The micro-adjustment in laser pulse emission direction.
Because laser pulse signal amplitude is larger and the amplitude of control information is smaller, therefore, it can by amplitude comparator
To distinguish laser pulse signal and control information, the phase adjustment unit battle array of phased laser array is controlled eventually through control information
Row, and then control the direction of the launch of laser pulse.
The laser of pulsed mainly uses short time pulse technique to realize instantaneous high power, therefore pulse and arteries and veins
Certain time interval is there is between punching, in order to realize the accurate alignment of the direction of the launch, when we can make full use of these
Between be spaced and add control information, the present invention is specifically that the control of fine setting laser direction is added between the time interval of laser pulse
Information processed, makes the laser signal direction of the launch of transmitting terminal meet the requirement of communication system all the time.Laser pulse signal is by PAM
Modulation system is modulated coding, and the control information between laser pulse signal is that coding is modulated using PPM modes.
PAM modulation is pulse amplitude modulation, and principle is a kind of modulation system for changing with baseband signal of amplitude of pulse carrier.PPM is adjusted
System is pulse position modulation, and its principle is made by encoding the laser pulse letter for producing PPM pulse signals, launching laser
Number it is modulated, it is as shown in Figure 1 to realize PPM modulation with 8-PPM modulation systems in the present invention.
Assuming that the time interval between two laser pulse signals is fixed as T1, added between two laser pulse signals
The low level control information of control information is carried, with the original position in signal code source at intervals of T2, mixed signal is passed via light
Transmission link is transmitted to phased laser array, and the phase adjustment unit array of phased laser array is controlled eventually through control information, is entered
And the direction of the launch of laser pulse is controlled, mixed light code symbols structure is as shown in Figure 2.
Reference picture 3 and Fig. 4, mixed light coding method and device that the present invention is provided, its mixed light coding method are included such as
Lower step：
(1) laser pulse signal is modulated and is encoded by pulse-amplitude modulation mode (PAM)；
(2) control information is modulated and is encoded using pulse position modulation (PPM) mode；Wherein control information is utilized
Be that PPM modulation mode is modulated coding, and due to the amplitude of laser pulse signal is larger and the amplitude of control information compared with
It is small, so distinguishing laser pulse signal and control information easily by the gap of amplitude.
(3) mixing to laser pulse signal and control information is realized by laser composite wave device；Laser composite wave device will be according to
Control information after PPM modulation mode is modulated was merged into the pulse spacing of laser pulse signal, realized control information and laser
The mixing of pulse signal.
(4) mixed signal of laser pulse signal and control information is transmitted to phased laser array through optical fiber link；
(5) according to the difference of amplitude, laser pulse signal and control information are isolated by amplitude comparator；Amplitude Ratio compared with
Device be according to the difference between control information and the amplitude information of laser pulse signal come realize control information and laser pulse letter
Number separation.
(6) the phase adjustment unit array of phased laser array is controlled by control information, the launch party of laser pulse is controlled
To；Phase adjustment unit array be according to control information come realize control each phase unit phase-shift phase, control unit
The phase of output light-wave is in particular directions.
Mixed light code device of the invention, including laser pulse device 1, output end and the PAM of the laser pulse device 1 are adjusted
The input connection of device processed 2, the output end of PAM modulators 2 and the output end of PPM modulation device 3 respectively with laser composite wave device 4
Input is connected, and the output end of laser composite wave device 4 is connected with the input of optical fiber link 5, the output end and amplitude of optical fiber link 5
The input connection of comparator 6, the output end of amplitude comparator 6 connects the input and phase adjusted of PPM demodulators 7 respectively
The input of cell array 8, the output end of PPM demodulators 7 is connected with the input of phase adjustment unit array 8, phase adjusted
The output end of cell array 8 connects the input of collector lens 9；The laser pulse device of this mixed light code device is by input signal
The laser signal for being converted into pulsed then passes through PAM modulators laser pulse signal is modulated according to PAM modulation system
Coding, and control information is modulated and encodes through PPM modulation device according to PPM modulation mode, the laser of control information and input
Pulse signal is merged by laser composite wave device, and the laser signal after merging is transmitted to amplitude comparator by optical fiber link,
Amplitude comparator is separated laser pulse signal and control information according to the difference of amplitude, and subsequent control information is by PPM
The phase unit array that demodulator recovers to original control information and to laser pulse signal is adjusted, then will be through phase
Laser pulse signal after adjustment unit array is input to collector lens, last outgoing laser beam.
According to the concrete operation step of mixed light coding method, apparatus of the present invention are as shown in figure 3, input signal is passed through the present invention
Cross after laser pulse device and change into the laser signal of pulsed, it is assumed that the laser pulse signal to be transmitted is modulated by PAM and compiled
It is 110101110101 after code, it is assumed that for adjusting the control information of laser direction by being 010 after PPM modulation device modulating-coding
100 101 110 001 100 010 100 101 110 001, laser pulse signal with through PPM modulation encode control information
Merged by laser composite wave device, the signal after merging is as shown in figure 5, due to laser pulse signal and control information amplitude phase
Difference is very big, so amplitude comparator can separate control information with laser pulse signal according to the difference of the two amplitude, passes through
The control information that PPM demodulation recovers realizes control information to laser pulse with laser pulse signal into phase adjustment unit array
The fine adjustment of signal, eventually passing the laser pulse signal of adjustment carries out the output of next step into collector lens.
Therefore, the present invention can realize control after control information is added to laser pulse signal using mixed light coding method
The phase adjustment unit array of phased laser array processed, the direction of micro-adjustment laser pulse signal makes the transmitting of laser pulse signal
Angle is controlled within the zone of reasonableness of system all the time.Can not only ensure what is used in transmitting terminal using mixed light coding method
It is high-power pulse type laser signal, can also simultaneously controls the phase adjustment unit array of phased laser array, improves antenna
The alignment precision of array.
There is no the part for describing in detail to belong to the known conventional means of the industry in present embodiment, do not chat one by one here
State.It is exemplified as above be only to of the invention for example, do not constitute the limitation to protection scope of the present invention, it is every with this
The same or analogous design of invention is belonged within protection scope of the present invention.
Claims (5)
1. a kind of mixed light coding method, it is characterised in that comprise the following steps：
(1) laser pulse signal is modulated and is encoded by pulse-amplitude modulation mode PAM；
(2) control information is modulated and is encoded using pulse position modulation mode PPM；
(3) mixing to laser pulse signal and control information is realized by laser composite wave device；
(4) mixed signal of laser pulse signal and control information is transmitted to phased laser array through optical fiber link；
(5) according to the difference of amplitude, laser pulse signal and control information are isolated by amplitude comparator；
(6) the phase adjustment unit array of phased laser array is controlled by control information, the direction of the launch of laser pulse is controlled.
2. a kind of mixed light coding method as claimed in claim 1, it is characterised in that the laser composite wave described in step (3)
Be merged into control information after being modulated according to PPM modulation mode in the pulse spacing of laser pulse signal by device, realizes control letter
The mixing of breath and laser pulse signal.
3. a kind of mixed light coding method as claimed in claim 1, it is characterised in that Amplitude Ratio described in step (5) compared with
Device be according to the difference between control information and the amplitude information of laser pulse signal come realize control information and laser pulse letter
Number separation.
4. a kind of mixed light coding method as claimed in claim 1, it is characterised in that the phase adjusted described in step (6)
Cell array be according to control information come realize control each phase unit phase-shift phase, control unit output light-wave phase
Position is in particular directions.
5. a kind of mixed light code device, it is characterised in that including laser pulse device (1), the output of the laser pulse device (1)
End is connected with the input of PAM modulators (2), and the output end of PAM modulators (2) and the output end of PPM modulation device (3) are distinguished
Input with laser composite wave device (4) is connected, and the output end of laser composite wave device (4) is connected with the input of optical fiber link (5), light
The output end of fine link (5) is connected with the input of amplitude comparator (6), and the output end of amplitude comparator (6) connects PPM respectively
The input of demodulator (7) and the input of phase adjustment unit array (8), output end and the phase of PPM demodulators (7) are adjusted
The input connection of section cell array (8), the input of output end connection collector lens (9) of phase adjustment unit array (8).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611133433.XA CN106788761B (en) | 2016-12-10 | 2016-12-10 | A kind of mixed light coding method and device |
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| CN201611133433.XA CN106788761B (en) | 2016-12-10 | 2016-12-10 | A kind of mixed light coding method and device |
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| CN106788761A true CN106788761A (en) | 2017-05-31 |
| CN106788761B CN106788761B (en) | 2019-05-07 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110289907A (en) * | 2019-07-10 | 2019-09-27 | 中国科学院长春光学精密机械与物理研究所 | Laser communications method and system based on two-dimensional laser phased array |
| CN112821957A (en) * | 2021-01-05 | 2021-05-18 | 鹏城实验室 | Signal modulation method, demodulation method and optical communication system |
| CN116625166A (en) * | 2023-07-20 | 2023-08-22 | 西安松果电子科技有限公司 | Structure unwinding method and device for laser semi-active guide head |
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| US8026837B1 (en) * | 2010-04-22 | 2011-09-27 | The Aerospace Corporation | Systems and methods for converting wideband signals in the optical domain |
| CN102576971A (en) * | 2009-10-02 | 2012-07-11 | Imra美国公司 | Optical signal processing with modelocked lasers |
| CN104993367A (en) * | 2015-06-25 | 2015-10-21 | 西安理工大学 | Wireless laser communication PPM modulator and method for synthesizing multi-light-source sequence thereof |
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2016
- 2016-12-10 CN CN201611133433.XA patent/CN106788761B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102576971A (en) * | 2009-10-02 | 2012-07-11 | Imra美国公司 | Optical signal processing with modelocked lasers |
| US8026837B1 (en) * | 2010-04-22 | 2011-09-27 | The Aerospace Corporation | Systems and methods for converting wideband signals in the optical domain |
| CN104993367A (en) * | 2015-06-25 | 2015-10-21 | 西安理工大学 | Wireless laser communication PPM modulator and method for synthesizing multi-light-source sequence thereof |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110289907A (en) * | 2019-07-10 | 2019-09-27 | 中国科学院长春光学精密机械与物理研究所 | Laser communications method and system based on two-dimensional laser phased array |
| CN112821957A (en) * | 2021-01-05 | 2021-05-18 | 鹏城实验室 | Signal modulation method, demodulation method and optical communication system |
| CN116625166A (en) * | 2023-07-20 | 2023-08-22 | 西安松果电子科技有限公司 | Structure unwinding method and device for laser semi-active guide head |
| CN116625166B (en) * | 2023-07-20 | 2023-10-03 | 西安松果电子科技有限公司 | Structure unwinding method and device for laser semi-active guide head |
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| CN106788761B (en) | 2019-05-07 |
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