CN103326788A - Device and method for high-speed digital modulation on pulsed laser - Google Patents
Device and method for high-speed digital modulation on pulsed laser Download PDFInfo
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- CN103326788A CN103326788A CN2013102631992A CN201310263199A CN103326788A CN 103326788 A CN103326788 A CN 103326788A CN 2013102631992 A CN2013102631992 A CN 2013102631992A CN 201310263199 A CN201310263199 A CN 201310263199A CN 103326788 A CN103326788 A CN 103326788A
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Abstract
The invention discloses a device and method for high-speed digital modulation on a pulsed laser. The device comprises a high-frequency clock module (1), a pulse interval adjusting module (2), a high-frequency pulse counter (3), a pulse width adjusting module (4), a modulation pulse generator (5), a light driver (6) and a pulse laser (7). On the premise of maintaining the duty ratio needed by the working of the pulsed laser, the digital modulation is achieved by respectively changing and sending the width of an optical pulse and the size of a pulse interval. The method comprises the first step of using 2N pulses with different widths to represent N bits of digital information, the second step of using 2M pulse intervals with different lengths to represent M bits of digital information, and the third step of modulating the pulse widths and the pulse intervals on the (N+M) bits of information respectively according to the mentioned method to form a digital pulse sequence, and driving the pulsed laser to emit light through the digital pulse sequence. The device and method can meet the duty ratio needed by the working of the pulsed laser, and achieves high-speed modulation.
Description
Technical field
The present invention relates to a kind of two-forty Ditital modulation method and device for pulse laser, the method and device utilize pulse duration size and the time in pulse spacing to represent multi-bit data, can realize the two-forty Digital Modulation for pulse laser.
Background technology
Pulse laser can send the burst pulse of high-peak power, and the high time resolution that it provides and surprising power density provide strong means for many research fields.Obtained more application in wireless light communication and laser acquisition, its system bandwidth, operating distance, precision, the performance such as anti-interference all depend on the exomonental quality of laser.
The wireless light communication technology is that a kind of laser that utilizes is carrier, and air is transmission medium, and the short distance point to point wireless communication mode based on the light transmission is also referred to as free space optical communication technology (Free Space Optic, FSO).The FSO technology does not take the radio frequency resource, and anti-electromagnetic interference capability is strong, good confidentiality, and it is convenient, easy to use to install.In the wireless light communication of reality is used, usually need the challenge in the face of different atmospheric conditions, such as at haze weather, the loss of atmosphere is very large.
In the existing radio optical communication system, it is the continuous conductor laser of tens milliwatts that light source often adopts power, its modulation rate is very high, but because less transmitting optical power, when the circuit loss is larger, often cisco unity malfunction maybe can only work in shorter communication distance, can not satisfy actual needs.Therefore, use the higher pulse laser of peak power also to become gradually a kind of selection of researcher.
The peak power of pulse laser is higher, take semiconductor pulse laser as example, its peak power can reach more than the hectowatt, but pulse laser can only work in discontinuous pulse condition, it requires the width of transmitted and the pulse duty factor all can not be too large, and the repetition rate of pulse can not be too high.These operating characteristic of pulse laser are so that it can not adapt to existing communication modulation system well.In order in communications applications, to use pulse laser, can obtain higher transmission rate again, therefore be necessary the work characteristics for pulse laser, design a kind of suitable two-forty Ditital modulation method and device.
Summary of the invention
Technical problem: for the problems referred to above, the invention provides a kind of two-forty digital modulation device and method for pulse laser, this device can adapt to the operating characteristic of pulse laser, can realize again the two-forty modulation.Adopt the present invention, the modulation rate of pulse laser can obtain great raising, does not also affect the normal operation of pulse laser itself simultaneously.
Technical scheme: a kind of two-forty digital modulation device for pulse laser of the present invention comprises high frequency clock module, pulse spacing adjusting module, high-frequency impulse counter, pulse duration adjusting module, modulation pulse generator, CD-ROM driver, pulse laser; Wherein, the input of the output termination high-frequency impulse counter of high frequency clock module, the high-frequency impulse counter has two outputs, one of them connects the input of pulse spacing adjusting module, another connects the input of pulse duration adjusting module, the output of pulse spacing adjusting module and pulse duration adjusting module connects respectively the input of modulation pulse generator, and modulation pulse generator, CD-ROM driver, pulse laser sequentially are connected in series;
The high frequency clock module produces the clock signal of high frequency, by the high-frequency impulse counter according to the data that will modulate, produce corresponding pulse duration and pulse spacing by control impuls width adjustment module and pulse spacing adjusting module, then produce pulse train by modulation pulse generator, send light pulse by the CD-ROM driver pulse laser, thereby realize the Digital Modulation of pulse laser.
The Ditital modulation method of a kind of two-forty digital modulation device for pulse laser of the present invention is: keeping under the required duty ratio prerequisite of pulse laser work, width by change sending respectively light pulse and pulse spacing size the steps include: to realize Digital Modulation
The first step: with 2
NThe pulse of individual different in width represents N position digital bit information; The width means of pulse is t
1, t
1+ Δ τ
1..., t
1+ (2
N-1) Δ τ
1, here, t
1Should be greater than the minimum pulse width of pulse laser, t
1+ (2
N-1) Δ τ
1Should be less than the maximum pulse of pulse laser, Δ τ
1For the difference of maximum pulse and minimum pulse width divided by 2
N
Second step: with 2
MThe pulse spacing of individual different length represents M position digital bit information; The length in pulse spacing can be expressed as t
2, t
2+ Δ τ
2..., t
2+ (2
M-1) Δ τ
2, here, t
2Should be greater than the minimum pulse interval of pulse laser, t
2+ (2
M-1) Δ τ
2Should be less than the maximum impulse interval of pulse laser, Δ τ
2For the difference at maximum impulse interval and minimum pulse interval divided by 2
M
The 3rd step: (N+M) position information bit is distinguished modulating pulse width and pulse spacing according to the method described above, form digital pulse sequence, and luminous with this pulse train pulse laser.
Beneficial effect: this Ditital modulation method disclosed by the invention, a kind of operating characteristic that can adapt to pulse laser is provided, can realize again the method and apparatus of two-forty modulation.
Description of drawings
Fig. 1 is the mode that pulse laser works in the OOK modulation;
Fig. 2 is the mode that pulse laser works in pulse width modulation;
Fig. 3 is the mode that pulse laser works in the pulse spacing modulation;
Fig. 4 is the mode that pulse laser works in pulse width modulation and pulse spacing modulation simultaneously;
Fig. 5 is the modulation module block diagram that pulse laser works in pulse width modulation and pulse spacing modulation simultaneously, wherein has: high frequency clock module 1, pulse spacing adjusting module 2, high-frequency impulse counter 3, pulse duration adjusting module 4, modulation pulse generator 5, CD-ROM driver 6, pulse laser 7.
Embodiment
In existing radio optical communication system, light source generally is continuous conductor laser, and the modulation system of employing can be on-off keying (OOK) or pulse position modulation (PPM).But the pulse laser pulse repetition rate that peak power is high is generally less than 100K Hz, if continue to adopt these traditional modulation systems, its modulation rate will be very low so, therefore must the new suitable modulation system of design.
Because pulse laser works in less pulse duty factor, thus be similar to one group of NRZ with the effect of OOK modulating pulse laser, as shown in Figure 1.Each pulse has or not the data that represent a bit among the figure.
The present invention proposes to utilize the width of pulse to come the method for representative information bit, as shown in Figure 2.For example: the pulse with 4 different in width comes characterization information, and then each pulse can represent the data of 2 bits.In like manner, the number of pulse duration is more, and then the information bit of transmission is also larger.Under the precondition that satisfies the pulse laser pulse duty factor, if in design, defined 2
NThe pulse of individual different in width represents different information, and then each pulse can represent the data of N bit.
The present invention also proposes to utilize the gap size of pulse to come the method for representative information bit, as shown in Figure 3.For example: with the pulse spacing characterization information of 4 different lengths, then each pulse spacing can represent the data of 2 bits.In like manner, the pulse spacing number of different length is more, and then the information bit of transmission is also larger.Under the precondition that satisfies the pulse laser pulse duty factor, if in design, defined 2
MThe pulse spacing of individual different length represents different information, and then each pulse spacing can represent the data of M bit.
Comprehensive two kinds of above-mentioned modulator approaches the present invention proposes the method for utilizing simultaneously pulse duration and pulse spacing modulating pulse laser, as shown in Figure 4.Under the precondition that satisfies the pulse laser pulse duty factor, if in design, defined simultaneously 2
NThe pulse of individual different in width and 2
MThe pulse spacing of individual different length represents different information, and then the width of each pulse and interval can represent the data of N+M bit.Therefore, the modulation rate of pulse laser can obtain great raising, does not also affect the normal operation of pulse laser itself simultaneously.
Two-forty digital modulation device for pulse laser disclosed by the invention comprises high frequency clock module 1, pulse spacing adjusting module 2, high-frequency impulse counter 3, pulse duration adjusting module 4, modulation pulse generator 5, CD-ROM driver 6, pulse laser 7; Wherein, the input of the output termination high-frequency impulse counter 3 of high frequency clock module 1, high-frequency impulse counter 3 has two outputs, one of them connects the input of pulse spacing adjusting module 2, another connects the input of pulse duration adjusting module 4, the output of pulse spacing adjusting module 2 and pulse duration adjusting module 4 connects respectively the input of modulation pulse generator 5, and modulation pulse generator 5, CD-ROM driver 6, pulse laser 7 orders are connected in series;
High frequency clock module 1 produces the clock signal of high frequency, by high-frequency impulse counter 3 according to the data that will modulate, produce corresponding pulse duration and pulse spacing by control impuls width adjustment module 4 and pulse spacing adjusting module 2, then produce pulse train by modulation pulse generator 5, send light pulse by CD-ROM driver 6 pulse laser 7, thereby realize the Digital Modulation of pulse laser.
Ditital modulation method for the two-forty digital modulation device of pulse laser is: keeping under the required duty ratio prerequisite of pulse laser work, by changing respectively the width that sends light pulse and pulse spacing size to realize Digital Modulation, the steps include:
The first step: with 2
NThe pulse of individual different in width represents N position digital bit information; The width means of pulse is t
1, t
1+ Δ τ
1..., t
1+ (2
N-1) Δ τ
1, here, t
1Should be greater than the minimum pulse width of pulse laser, t
1+ (2
N-1) Δ τ
1Should be less than the maximum pulse of pulse laser, Δ τ
1For the difference of maximum pulse and minimum pulse width divided by 2
N
Second step: with 2
MThe pulse spacing of individual different length represents M position digital bit information; The length in pulse spacing can be expressed as t
2, t
2+ Δ τ
2..., t
2+ (2
M-1) Δ τ
2, here, t
2Should be greater than the minimum pulse interval of pulse laser, t
2+ (2
M-1) Δ τ
2Should be less than the maximum impulse interval of pulse laser, Δ τ
2For the difference at maximum impulse interval and minimum pulse interval divided by 2
M
The 3rd step: (N+M) position information bit is distinguished modulating pulse width and pulse spacing according to the method described above, form digital pulse sequence, and luminous with this pulse train pulse laser.
Thereby realize the Digital Modulation of pulse laser.
Claims (2)
1. two-forty digital modulation device for pulse laser, it is characterized in that: this device comprises high frequency clock module (1), pulse spacing adjusting module (2), high-frequency impulse counter (3), pulse duration adjusting module (4), modulation pulse generator (5), CD-ROM driver (6), pulse laser (7); Wherein, the input of the output termination high-frequency impulse counter (3) of high frequency clock module (1), high-frequency impulse counter (3) has two outputs, one of them connects the input of pulse spacing adjusting module (2), another connects the input of pulse duration adjusting module (4), the output of pulse spacing adjusting module (2) and pulse duration adjusting module (4) connects respectively the input of modulation pulse generator (5), and modulation pulse generator (5), CD-ROM driver (6), pulse laser (7) order are connected in series;
High frequency clock module (1) produces the clock signal of high frequency, by high-frequency impulse counter (3) according to the data that will modulate, produce corresponding pulse duration and pulse spacing by control impuls width adjustment module (4) and pulse spacing adjusting module (2), then produce pulse train by modulation pulse generator (5), send light pulse by CD-ROM driver (6) pulse laser (7), thereby realize the Digital Modulation of pulse laser.
2. the Ditital modulation method of the two-forty digital modulation device for pulse laser as claimed in claim 1, it is characterized in that: keeping under the required duty ratio prerequisite of pulse laser work, width by change sending respectively light pulse and pulse spacing size the steps include: to realize Digital Modulation
The first step: with 2
NThe pulse of individual different in width represents N position digital bit information; The width means of pulse is t
1, t
1+ Δ τ
1..., t
1+ (2
N-1) Δ τ
1, here, t
1Should be greater than the minimum pulse width of pulse laser, t
1+ (2
N-1) Δ τ
1Should be less than the maximum pulse of pulse laser, Δ τ
1For the difference of maximum pulse and minimum pulse width divided by 2
N
Second step: with 2
MThe pulse spacing of individual different length represents M position digital bit information; The length in pulse spacing can be expressed as t
2, t
2+ Δ τ
2..., t
2+ (2
M-1) Δ τ
2, here, t
2Should be greater than the minimum pulse interval of pulse laser, t
2+ (2
M-1) Δ τ
2Should be less than the maximum impulse interval of pulse laser, Δ τ
2For the difference at maximum impulse interval and minimum pulse interval divided by 2
M
The 3rd step: (N+M) position information bit is distinguished modulating pulse width and pulse spacing according to the method described above, form digital pulse sequence, and luminous with this pulse train pulse laser.
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| CN2013102631992A CN103326788A (en) | 2013-06-26 | 2013-06-26 | Device and method for high-speed digital modulation on pulsed laser |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104932321A (en) * | 2014-03-19 | 2015-09-23 | 上海诺司纬光电仪器有限公司 | Multipoint laser |
| CN105245291A (en) * | 2014-07-07 | 2016-01-13 | 阿瓦亚公司 | Acoustic information transfer |
| CN106207746A (en) * | 2016-08-26 | 2016-12-07 | 江苏亚威机床股份有限公司 | A kind of cut pulse-width modulator |
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| CN1941675A (en) * | 2005-09-30 | 2007-04-04 | 株式会社东芝 | Transmitting and receiving device and transmitting device and receiving device |
| US20100054350A1 (en) * | 2008-08-28 | 2010-03-04 | Advantest Corporation | Modulation method and modulator using pulse edge shift |
| CN102668379A (en) * | 2009-10-13 | 2012-09-12 | 相干公司 | Digital pulse-width-modulation control of a radio frequency power supply for pulsed laser |
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2013
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1941675A (en) * | 2005-09-30 | 2007-04-04 | 株式会社东芝 | Transmitting and receiving device and transmitting device and receiving device |
| US20100054350A1 (en) * | 2008-08-28 | 2010-03-04 | Advantest Corporation | Modulation method and modulator using pulse edge shift |
| CN102668379A (en) * | 2009-10-13 | 2012-09-12 | 相干公司 | Digital pulse-width-modulation control of a radio frequency power supply for pulsed laser |
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| B. WILSON,ET AL.: ""Optical pulse interval and width modulation for analogue fibre communications"", 《IEE PROCEEDINGS-J》 * |
| MITSUTAKE SATO，ET AL.: ""A New Optical Communication System Using the Pulse Interval and Width Modulated Code"", 《IEEE TRANSACTIONS ON CABLE TELEVISION》 * |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104932321A (en) * | 2014-03-19 | 2015-09-23 | 上海诺司纬光电仪器有限公司 | Multipoint laser |
| CN105245291A (en) * | 2014-07-07 | 2016-01-13 | 阿瓦亚公司 | Acoustic information transfer |
| CN106207746A (en) * | 2016-08-26 | 2016-12-07 | 江苏亚威机床股份有限公司 | A kind of cut pulse-width modulator |
| CN106207746B (en) * | 2016-08-26 | 2022-01-07 | 江苏亚威机床股份有限公司 | Laser cutting pulse width modulator |
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Application publication date: 20130925 |