CN105553510B - A kind of production method of Gauss quadravalence derivative-type ultra-wideband pulse - Google Patents
A kind of production method of Gauss quadravalence derivative-type ultra-wideband pulse Download PDFInfo
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- CN105553510B CN105553510B CN201610012780.0A CN201610012780A CN105553510B CN 105553510 B CN105553510 B CN 105553510B CN 201610012780 A CN201610012780 A CN 201610012780A CN 105553510 B CN105553510 B CN 105553510B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/7163—Spread spectrum techniques using impulse radio
- H04B1/717—Pulse-related aspects
- H04B1/7174—Pulse generation
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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
- H04B10/508—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
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Optical Communication System (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
The invention discloses a kind of production methods of Gauss quadravalence derivative-type ultra-wideband pulse based on the single light intensity modulation singly driven and general single mode fiber.Experimental provision of the invention is as shown in Figure 1, by the power for adjusting the direct current biasing point and Gaussian pulse driving signal of the light intensity modulator singly driven, light intensity modulator is set to export the type pulse of Gauss second-order differential, after it is transmitted by general single mode fiber, using the effect of dispersion in optical fiber, it is converted into Gauss quadravalence derivative-type ultra-wideband pulse.Compared with existing program, pulse generating system structure in the present invention is simple, strong operability.
Description
Technical field
Common ultra-wideband pulse is one to five rank derivative-type pulse of Gauss.The present invention relates to one kind based on single single driving
Light intensity modulation and general single mode fiber Gauss quadravalence derivative-type ultra-wideband pulse production method.The invention belongs to microwaves
Photon technology field, especially light-carried wireless (RoF) technical field.
Background technique
The advantages that ultra wide band (UWB) pulse has a low-power consumption, anti-multipath fading, and penetrability is strong, strong antijamming capability, very
It is suitably applied the fields such as wireless communication, sensor network, radar imagery and system positioning.Common UWB pulse is Gauss one
To five rank derivative-type pulses.Wherein, the power spectrum of the ultra-wideband pulse (such as: the pulse of Gauss quadravalence derivative-type) of high-order more meets beauty
The Emission Mask requirement that state's Federal Communications Commission (FCC) defines.Currently, the method for generating the UWB pulse of Gauss quadravalence derivative-type
There are mainly two types of, one is be based on reflective semiconductor optical amplifier (RSOA) Mach-Zehnder interferometer structure, another
It is to be based on a double parallel Mach once modulator (DPMZM).
RSOA can be used to generate gaussian derivative type pulse.Gauss first differential type (monocycle) pulse can be based on
Gain saturaition in RSOA generates.Gauss second-order differential type (doublet) pulse can be based on cascade Turbo switch RSOA knot
Structure generates.By the orthogonal low order ultra-broadband signal of overlapping polarization state, Gauss three rank derivative-type (triplet) pulse can produce
With Gauss quadravalence derivative-type (quadruplet) pulse.(bibliography [1]: Hanlin Feng, Mable P.Fok, Shilin
Xiao,Jia Ge,Qi Zhou,Mary Locke,Ryan Toole and Weisheng Hu.A Reconfigurable
High-Order UWB Signal Generation Scheme Using RSOA-MZI Structure[J],IEEE
Photonics Journal,2014,V6(2):1-8).However, generating gaussian derivative type ultra-wideband pulse in this way, need to take
The gaussian derivative type pulsion phase of the impulse waveform and standard building more complicated system, and generate is than still there is biggish gap.
Using single double parallel Mach, once modulator (DPMZM) also can produce gaussian derivative type ultra-wideband pulse.At this time, it may be necessary to optimize
The parameter of the two-way driving signal of modulator and three direct current biasing points for adjusting modulator, could generate one to five rank of Gauss
Derivative-type pulse.(bibliography [2]: Qingjiang Chang, Yue Tian, Tong Ye, Junming Gao, and
Yikai Su.A 24-GHz Ultra-Wideband Over Fiber System Using Photonic Generation
and Frequency Up-Conversion[J],IEEE Photonics Technology Letters,2008,V20
(19): 1561-1563.) (bibliography [3]: Xiaoqian Yang and Juanjuan Yan.Generation of
High Order UWB Pulses Based on a Single Dual Parallel March-Zehnder Modulator
[C],14th International Conference on Optical Communications and Networks
(ICOCN), Nanjing, China, 2015:1-3).Although this method structure is simpler, the waveform compared with standard also can produce,
Be need optimizing regulation parameter there are six, bring inconvenience to practical operation.The present invention be directed to more than problem, based on single
The light intensity modulator and general single mode fiber singly driven proposes a kind of production method of Gauss quadravalence derivative-type UWB pulse.
Summary of the invention
The invention discloses a kind of production method of Gauss quadravalence derivative-type ultra-wideband pulse, basic principle is, first
Gauss second-order differential type (doublet) UWB pulse is generated using the light intensity modulator singly driven.Then by doublet pulse
General single mode fiber through certain length is transmitted, and using the effect of dispersion in optical fiber, produces doublet impulse waveform edge
Raw shake, develops into Gauss quadravalence derivative-type (quadruplet) pulse.
Specifically, the structure of Gauss quadravalence derivative-type UWB pulse generating device according to the present invention is as shown in Figure 1.
In figure, continuous light that the light intensity modulator (2) that the driving of periodical Gaussian pulse signal (5) singly drives issues laser (1)
It is modulated, by the power of DC offset voltage (6) and driving signal of adjusting strength modulator, makes light intensity modulator
Output is doublet pulse, this light pulse is converted into Gauss quadravalence derivative-type after one section of general single mode fiber (3) is transmitted
UWB pulse (4).
The invention has the following advantages that
1) method according to the present invention for generating the UWB pulse of Gauss quadravalence derivative-type is compared with other methods, only with
The single light intensity modulator and general single mode fiber singly driven, system structure are simpler.
2) compared with currently existing scheme, the present invention only needs modulator driving signal all the way, and the parameter for needing to adjust only has
The power of the direct current biasing point and driving signal of light intensity modulator, thus operability is stronger.
3) compared with currently existing scheme, present invention employs general single mode fiber, Gauss quadravalence derivative-type UWB pulse can be
Distal end relative to modulator position generates, and therefore, can also be applied in distributed system.
Detailed description of the invention
Fig. 1: the system block diagram that Gauss quadravalence derivative-type UWB pulse according to the present invention generates.
Fig. 2: the impulse waveform that experiment and emulation obtain, wherein solid line indicates the signal waveform that experiment generates, and dotted line indicates
Emulate the waveform generated.Fig. 2 (a) is waveform when modulator is exported without optical fiber transmission；Fig. 2 (b), (c) and (d) are respectively to pass through
Waveform after crossing the transmission of 30km, 40km and 50km optical fiber.
Fig. 3: the power spectrum for the pulse that experiment is generated with emulation, wherein solid line indicates the power spectrum signal that experiment generates, empty
Line indicates the signal power spectrum envelope that emulation generates, and the dotted line of each figure middle and upper part indicates FCC Emission Mask, Fig. 3 (a), (b) and
It (c) is respectively power spectrum of the intensity modulator output after the transmission of 30km, 40km and 50km optical fiber.
Specific embodiment
Gauss quadravalence derivative-type method for generating ultra-wideband pulse proposed by the invention, passed through theoretical simulation and test into
Gone verifying, experimental provision as shown in Figure 1, experimentation and experimental result be described with reference to the drawings it is as follows.
In experiment, pulse pattern generator generates the Gaussian pulse that width is 100ps, and specific mode is fixed
" 1,000 0,000 0,000 0000 " pattern, i.e. pulse recurrence frequency are 0.625GHz.It is singly driven using the driving of this pulse signal
Light intensity modulator, by adjusting the direct current biasing point of modulator and the power of Gaussian pulse, making modulator output is doublet
Pulse, and transmitted through general single mode fiber.The dispersion parameters of optical fiber be D=16ps/ns/km, attenuation coefficient be α=
0.215dB/km, effective sectional area Aeff=80 μm2.Experimental result is as shown in Figure 2, wherein solid line indicates the letter that experiment generates
Number waveform, dotted line indicate the waveform that emulation generates.Fig. 2 (a) is waveform when modulator is exported without optical fiber transmission；Fig. 2 (b),
(c) waveform with (d) respectively after the transmission of 30km, 40km and 50km optical fiber.It can be seen from Fig. 2 experimental waveform with
Simulation waveform is almost the same.When signal is transmitted without optical fiber, signal is rendered as Gauss second-order differential type (doublet) pulse.
When signal is after optical fiber transmits 30km, 40km and 50km, the waveform of signal is changed, and Gauss quadravalence derivative-type is rendered as
(quadruplet) pulse.Fig. 3 is the power spectrum for the signal that experiment is generated with emulation, wherein solid line indicates the letter that experiment generates
Power frequency spectrum, dotted line indicate that the signal power spectrum envelope that emulation generates, the dotted line of each figure middle and upper part indicate FCC Emission Mask.Fig. 3
(a), (b) and (c) is respectively power spectrum of the signal after the transmission of 30km, 40km and 50km optical fiber.It can be seen from the figure that real
The power spectrum signal for testing generation is consistent substantially with the signal power spectrum envelope that emulation generates, but the power spectrum signal for testing generation has
Some low frequency components, this is because there is some noise fluctuations at idle bit.Power spectrum after optical fiber transmits all meets FCC spoke
Masking is penetrated to require.Therefore, the explanation of Fig. 2 and 3, the Gauss quadravalence derivative-type ultra-wideband pulse generated using the method for the present invention is to used
The length of optical fiber is simultaneously insensitive, can obtain meeting FCC Emission Mask requirement being greater than within the scope of the wider fiber lengths of 30km
Ultra-wideband pulse.
The above experiment and simulation result all illustrate feasibility of the invention.
Claims (1)
1. the Gauss quadravalence derivative-type ultra-wideband pulse based on the single light intensity modulator singly driven and general single mode fiber
Production method, it is characterised in that including following device: laser (1), a light intensity modulator (2) singly driven, a Duan Pu
Logical single mode optical fiber (3), a Gaussian pulse generator (5), a DC voltage source (6)；Gaussian pulse generator (5) output is high
The continuous light wave that light intensity modulator (2) modulation laser (1) of this pulsed drive list driving generates, DC voltage source (6) are
The light intensity modulator (2) singly driven provides direct current biasing, by the output voltage and Gaussian pulse that adjust DC voltage source (6)
The output signal power of generator (5) makes the output Gauss second-order differential type pulse of light intensity modulator (2), this pulse letter
Number by general single mode fiber (3) transmit, using accumulated chromatic dispersion effect therein, by Gauss second-order differential type ultra-short pulse red switch
Quadravalence derivative-type pulse (4) is turned to, fiber lengths used are greater than 30km.
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| US6915040B2 (en) * | 1997-12-15 | 2005-07-05 | University Of Southern California | Devices and applications based on tunable wave-guiding bragg gratings with nonlinear group delays |
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| CN102645761B (en) * | 2012-04-26 | 2014-05-14 | 上海交通大学 | High speed photoelectric real-time oscilloscope system |
| CN102694576B (en) * | 2012-05-04 | 2015-01-28 | 华中科技大学 | Ultra wide band signal generator based on electric band-pass filter |
| CN103023531A (en) * | 2012-11-22 | 2013-04-03 | 湖南大学 | Full-gloss ultra wide band pulse generation method based on semiconductor light amplifier and light time delay line |
| CN103701530A (en) * | 2014-01-15 | 2014-04-02 | 华南师范大学 | Optical fiber wireless transmission system |
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Patent Citations (6)
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| US6915040B2 (en) * | 1997-12-15 | 2005-07-05 | University Of Southern California | Devices and applications based on tunable wave-guiding bragg gratings with nonlinear group delays |
| EP1193515A3 (en) * | 2000-10-02 | 2003-06-04 | Zen Photonics Co. Ltd. | Externally controllable waveguide type higher order optical mode converter |
| CN1392639A (en) * | 2001-06-14 | 2003-01-22 | 楼宪法 | Method for producing high-order mode-locking pulse in positive mode-locking erbium doping optical fibre circular laser |
| CN102544985A (en) * | 2011-12-31 | 2012-07-04 | 湖南大学 | Optical fiber type terahertz wave generation device and method based on modulation instability |
| CN202586962U (en) * | 2012-05-23 | 2012-12-05 | 北京交通大学 | Optical generating device of UWB high-order Gaussian pulse |
| CN102769496A (en) * | 2012-07-28 | 2012-11-07 | 文鸿 | Device and method for generating octuple-frequency optical millimeter waves |
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