CN106506090A - A kind of optical heterodyne regulator control system of Terahertz ultra-wideband communications waveform - Google Patents
A kind of optical heterodyne regulator control system of Terahertz ultra-wideband communications waveform Download PDFInfo
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- CN106506090A CN106506090A CN201610877177.9A CN201610877177A CN106506090A CN 106506090 A CN106506090 A CN 106506090A CN 201610877177 A CN201610877177 A CN 201610877177A CN 106506090 A CN106506090 A CN 106506090A
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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
- H04B10/54—Intensity modulation
- H04B10/541—Digital intensity or amplitude 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
- H04B10/524—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
- H04B10/556—Digital modulation, e.g. differential phase shift keying [DPSK] or frequency shift keying [FSK]
- H04B10/5561—Digital phase modulation
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- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Optical Communication System (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
The invention discloses a kind of optical heterodyne regulator control system of Terahertz ultra-wideband communications waveform, including high repeat frequency pulsed laser source, programmable pulse reshaper, continuous wave laser, double parallel MZ Mach-Zehnder, bonder, terahertz transmitter, the present invention produces terahertz pulse sequence using the heterodyne mixing mode photoelectricity of continuous light and pulsed light, double parallel MZ Mach-Zehnder modulates the modulation that continuous light realizes Terahertz communication pulse, programmable pulse reshaper in area of light shaping light pulse designing terahertz pulse shape；The program can achieve the modulation of Terahertz high-speed pulse signal of communication.
Description
Technical field
The invention belongs to wireless communication field, and in particular to a kind of optical heterodyne regulation and control system of Terahertz ultra-wideband communications waveform
System.
Background technology
For solving the problems, such as existing wireless communications system spectral resources and finite capacity, in recent years, Terahertz communication is subject to
Extensive attention.Terahertz frequency range is often referred to 0.1～10THz, and communication bandwidth is much larger than microwave and millimeter wave, based on photovoltaic
Terahertz communication system portability up to tens to hundreds of gigabit (Gbps) data messages.
The method of Terahertz communication mainly has continuous terahertz carrier signal modulation and terahertz pulse to modulate.Continuous THz wave
Carrier wave is typically produced by the way of optical heterodyne mixing (photo-mixing) two-way continuous laser, is wherein connected all the way by modulation
Continuous laser realizes the modulation of Terahertz signal of communication.And the photoelectricity producing method of common terahertz pulse is shone for ultrashort light pulse
Penetrate nonlinear crystal and femtosecond pulse excitation photoconductive antenna etc..Nonlinear effect and photoconductive effect are required for very high optics
Peak power, and the damage luminous power of electrooptic modulator is substantially exceeded, so the repetition rate of femtosecond pulse is generally all very low
(50-100MHz), and it is unfavorable for the optical modulation of terahertz signal.
Common terahertz pulse emitting-receiving system is by femtosecond pulse source (femtosecond laser), chopper
(optical chopper), beam splitter (BS), THz emitters (THz emitter), receptor (THz detector)
Deng composition.By the principle of instantaneous photoconductivity switching (photoconductive switching), when photoelectric current is changed over
When, the time diffusion of the corresponding incident laser beam intensity of the photoelectric current size which produces, so that be converted into width by femto-second laser pulse
Band terahertz pulse.
Publication No. discloses a kind of big energy terahertz pulse production method and device for the patent of 104155825 A of CN,
The femtosecond pulse of a branch of high-energy is uniformly divided into two beams or multi beam specifically, they is incided parameter respectively identical
ZeTn crystal in, terahertz pulse is produced respectively by femtosecond pulse optical rectification process in crystal, is prolonged by regulating time
The terahertz pulse of generation is made late while reaching detector, the terahertz pulse of optics coherence tomography can be obtained.The repetition of the method
Frequency is than relatively low, and is unfavorable for the optical modulation of terahertz signal.
Content of the invention
The invention provides a kind of optical heterodyne regulator control system of Terahertz ultra-wideband communications waveform, using continuous light and pulse
The heterodyne mixing mode of light realizes the generation of terahertz pulse, and can realize the modulation of Terahertz high-speed pulse signal of communication.
A kind of optical heterodyne regulator control system of Terahertz ultra-wideband communications waveform, including high repeat frequency pulsed laser source, can
Programming pulse reshaper, continuous wave laser, double parallel MZ Mach-Zehnder (DPMZM), fibre delay line, bonder, too
Hertz emitter (UTC-PD)；Described programmable pulse reshaper carries out waveform shaping to high repetition frequency light impulse source, and
The pulse signal of shaping is transported to bonder；Described double parallel MZ Mach-Zehnder is adjusted to continuous wave laser
System, and the optical signal of modulation is transported to bonder through fibre delay line, described bonder is by the pulse signal and tune of shaping
Terahertz transmitter is irradiated to after the optical signal coupling of system, terahertz pulse is produced.
Described high repeat frequency pulsed laser source is used for launching 1550nm optical communicating waveband high repetition frequencies (>=10GHz)
Pulse source.
Described high repeat frequency pulsed laser source is semiconductor laser with tunable or optical fiber laser.
Described programmable pulse reshaper is f to high repetition frequency0Light impulse source carry out waveform shaping.Pulse source exists
Frequency interval is rendered as on frequency domain for f0Comb spectrum, by the fine shaping of frequency spectrum, the shape of pulse can be designed.
Described programmable pulse reshaper the comb spectrum by-line (line-by-line) of high repetition frequency is made amplitude and
Phase Processing.Processed by the light impulse source frequency spectrum by-line to frequency domain, flexible modulation design pulse temporal waveform, example in area of light
Such as gaussian-shape, parabola shaped, Lorentz shape etc..According to the Fourier transform corresponding relation of time domain waveform and frequency-domain spectrum, for example,
When after the shaping of programmable pulse reshaper, output comb spectrum assumes Gaussian envelope, pulse is repetition rate f in time domain0's
Gaussian pulse.
High repetition frequency is f0Corresponding time domain impulse time interval is T.
Described continuous wave laser produces continuous stable state optical signal.
Described double parallel MZ Mach-Zehnder is by two sub- MZ Mach-Zehnder (MZM) and a main Mach
Zeng Deer manipulators are constituted, and the sub- MZ Mach-Zehnder of two of which is embedded in two modulation of main MZ Mach-Zehnder
On arm.Double parallel MZ Mach-Zehnder passes through to modulate digital baseband signal on two sub- MZ Mach-Zehnders, and
Quadrature phase control to being input into continuous laser is realized by main MZ Mach-Zehnder, such that it is able to realize such as orthogonal phase shift
The complex modulation modes such as keying (QPSK).
Described fibre delay line is using the 1550nm optic communications adjustable delay control line based on optical fiber.
Described fibre delay line is used for adjusting the time that digital signal reaches bonder, realizes digital signal and light pulse
Synchronization, the corresponding N number of pulse of a bit digital signal.
The two-way 1550nm wave band optical signals for being connected to coupler input are coupling in all the way and defeated by described bonder
Go out.
, using the integrated single file carrier photodetector of antenna, terahertz transmitter is relative for described terahertz transmitter
In traditional photodetector, the electronics of only high-speed mobile is the carrier of excited state, thus with ultrafast picosecond magnitude
Photo response speed and the bandwidth of super large.
In time domain, each digital bit will modulate N number of pulse simultaneously, produce the mid frequency of terahertz pulse by shaping
Pulse signal with modulation continuous optical signal central wavelength difference determine.For example, the pulse center wavelength of light after shaping and company
During the centre wavelength difference 2.4nm of continuous laser, the terahertz pulse mid frequency of generation is in 300GHz.
Generally, terahertz sources antenna is two kinds of electrode structures of dipole (Dipole) or knot (Bow-Tie)
Small-bore antenna, terahertz emission electromagnetic wave is the first differential of transient photocurrents in detector in the time domain.Therefore, terahertz
Hereby the shape of pulses of radiation is designed by light pulse filter shape sweetly disposition.
The modulation format (such as OOK, BPSK, QPSK etc.) of terahertz pulse is by this simple mode reality of the continuous light of modulation
Existing.
The work process of the optical heterodyne regulator control system of Terahertz ultra-wideband communications waveform is as follows：
Programmable pulse reshaper carries out waveform shaping to high repetition frequency light impulse source, and MZ Mach-Zehnder is to even
Continuous laser instrument carries out relative low speeds (f0/ N) modulation, the pulse source of shaping with modulation continuous optical signal coupled by bonder
Irradiate terahertz transmitter afterwards together, produce terahertz pulse, under optical heterodyne mixing mechanism, a light pulse correspondingly will be produced
A raw terahertz pulse.
The present invention produces Terahertz modulated pulse trains using the heterodyne mixing mode photoelectricity of continuous light and pulsed light.Terahertz
The regulation and control of hereby pulse are all carried out in area of light, and the modulation of Terahertz communication pulse is realized by modulating continuous light, terahertz pulse shape
By programmable pulse reshaper, shaping light pulse in area of light is designed shape.The program can achieve the communication of Terahertz high-speed pulse
The modulation of signal.
The present invention compared with other terahertz pulse emitting-receiving systems, have the advantage that for：
(1) mid frequency of terahertz pulse is determined by two laser center wavelength differences of heterodyne, simple and easy to control.
(2) terahertz time-domain impulse waveform passes through programmable pulse reshaper in area of light flexible design.
(3) pulse code is realized by modulating continuous light, can achieve the high-speed communication of terahertz pulse.
Description of the drawings
Fig. 1 is the structural representation of the present invention；
Fig. 2 is the Terahertz waveform of QPSK modulation.
Specific embodiment
In order to more specifically describe the present invention, below in conjunction with the accompanying drawings and specific embodiment is to technical scheme
It is described in detail.
As shown in figure 1, the optical heterodyne regulator control system of Terahertz ultra-wideband communications waveform, including high repeat frequency pulsed laser
Source, programmable pulse reshaper, continuous wave laser, double parallel MZ Mach-Zehnder, fibre delay line, bonder, terahertz
Hereby emitter.
High repetitive frequency pulsed source of the pulsed laser source using 1550nm optical communicating wavebands, such as 10GHz repetition rates, also
Higher repetition rate, such as 40GHz even more highs can be obtained by way of Optical Time Division Multiplexing.
Programmable pulse reshaper is may be programmed using the 10GHz resolution 1550nm wave band based on solid-state Liquide Crystal On Silicon
Optical processor, makees amplitude and Phase Processing to the frequency spectrum by-line (line-by-line) of high repetition frequency.According to time domain waveform and
The Fourier transform corresponding relation of frequency-domain spectrum, is processed by the spectral fine of frequency domain, designs the output frequency domain of optical processor
Envelope shape, such as gaussian-shape, parabola shaped, Lorentz shape etc., so that regulate and control impulse waveform in area of light.Terahertz time-domain spoke
First differential of the radio magnetic wave for respective waveforms, therefore, terahertz pulse shape is determined by the optical pulse shape designed in area of light,
The first differential of such as Gaussian light pulse is Gaussian monocycle pulse (Gaussian monocycle).
Continuous wave laser is swashed with 1550nm band wavelengths semiconductor laser with tunable or optical fiber using conventional optic communication
Light device.
Fibre delay line is using the 1550nm optic communications adjustable delay control line based on optical fiber.
Commercialization of the double parallel MZ Mach-Zehnder using the grazing shot bandwidth (less than 10GHz) of 1550nm wave bands
DPMZM manipulators, carry out f to continuous wave laser0The binary digital signal modulation of/N, N is integer.Continuous laser after modulation
By optical fiber delay line traffic control time delay, with synchronous digital bit and light pulse (bit corresponding N number of pulse).In 3dB optical fiber couplings
After clutch, the pulsed light after synchronous modulation continuous laser and shaping is combined into all the way and sends into the integrated terahertz sources of antenna
Device.Up to 1.5THz, the transmission power of 300GHz frequencies is up to 0dBm to the responsive bandwidth of Japan NTT commercialization UTC-PD at present,
In addition the UTC-PD that Britain UCL and France IEMN is developed also has the performance such as goodish bandwidth and responsiveness.
Under the heterodyne mixing mechanism of terahertz transmitter, the central wavelength difference of two-way light will determine Terahertz center frequency
Rate, for example, during the centre wavelength difference 2.4nm of pulse center wavelength of light and continuous laser after shaping, the Terahertz arteries and veins of generation
Mid frequency is rushed in 300GHz.Meanwhile, in the case of a bit digital signal and N number of optical pulse synchronization, N number of pulse will be by
Same bit modulation, so as to identical terahertz pulse waveform, amplitude and phase place.
Fig. 2 illustrates the Terahertz waveform of QPSK modulation, and 00 and 11 waveforms of aerial radiation are Gauss two reverse each other
Rank differential (doublet) pulse, 01 and 10 is Gaussian monocycle pulse (monocycle) reverse each other.Therefore, pass through
The continuous light of low-rate modulation, it is to avoid using big bandwidth modulation device, realize the coding of high speed Terahertz communication pulse.
Above-described specific embodiment has been described in detail to technical scheme and beneficial effect, Ying Li
Solution is to the foregoing is only presently most preferred embodiment of the invention, is not limited to the present invention, all principle models in the present invention
Interior done any modification, supplement and equivalent etc. is enclosed, be should be included within the scope of the present invention.
Claims (6)
1. a kind of optical heterodyne regulator control system of Terahertz ultra-wideband communications waveform, it is characterised in that：Including high repetitive frequency pulsed
Lasing light emitter, programmable pulse reshaper, continuous wave laser, double parallel MZ Mach-Zehnder, fibre delay line, bonder with
And terahertz transmitter；Described programmable pulse reshaper carries out pulse waveform shaper to high repetition frequency light impulse source, and
The pulse signal of shaping is transported to bonder；Described double parallel MZ Mach-Zehnder is adjusted to continuous wave laser
System, and the optical signal of modulation is transported to bonder through fibre delay line, described bonder is by the pulse signal and tune of shaping
Terahertz transmitter is irradiated to after the optical signal coupling of system, terahertz pulse is produced.
2. the optical heterodyne regulator control system of Terahertz ultra-wideband communications waveform as claimed in claim 1, it is characterised in that described
Frequency >=the 10GHz of the pulse source of high repeat frequency pulsed laser source transmitting.
3. the optical heterodyne regulator control system of Terahertz ultra-wideband communications waveform as claimed in claim 1, it is characterised in that described
High repeat frequency pulsed laser source is semiconductor laser with tunable or optical fiber laser.
4. the optical heterodyne regulator control system of Terahertz ultra-wideband communications waveform as claimed in claim 1, it is characterised in that described
Double parallel MZ Mach-Zehnder is made up of two sub- MZ Mach-Zehnders and a main MZ Mach-Zehnder, its
In two sub- MZ Mach-Zehnders be embedded in two modulation arms of main MZ Mach-Zehnder.
5. the optical heterodyne regulator control system of Terahertz ultra-wideband communications waveform as claimed in claim 1, it is characterised in that described
Fibre delay line is using the 1550nm optic communications adjustable delay control line based on optical fiber.
6. the optical heterodyne regulator control system of Terahertz ultra-wideband communications waveform as claimed in claim 1, it is characterised in that described
Terahertz transmitter is the integrated single file carrier photodetector of antenna.
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Cited By (5)
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| CN108712214A (en) * | 2018-05-08 | 2018-10-26 | 浙江大学 | A kind of tunable mostly band terahertz pulse wireless communication emitter |
| CN110808789A (en) * | 2019-11-12 | 2020-02-18 | 中国舰船研究设计中心 | Ultra-wideband high-frequency electromagnetic environment signal generation method based on optical heterodyne technology |
| CN111541490A (en) * | 2020-05-26 | 2020-08-14 | 重庆邮电大学 | DPMZM-based QPSK-BPSK all-optical modulation format conversion system |
| CN114301535A (en) * | 2021-12-29 | 2022-04-08 | 杭州电子科技大学 | Method and system for generating light arbitrary waveform of multiple weighted continuous lights |
| CN116192173A (en) * | 2023-03-02 | 2023-05-30 | 电子科技大学 | Terahertz channel monitoring receiver based on photoelectric mixer |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN111541490A (en) * | 2020-05-26 | 2020-08-14 | 重庆邮电大学 | DPMZM-based QPSK-BPSK all-optical modulation format conversion system |
| CN111541490B (en) * | 2020-05-26 | 2023-03-10 | 重庆邮电大学 | DPMZM-based QPSK-BPSK all-optical modulation format conversion system |
| CN114301535A (en) * | 2021-12-29 | 2022-04-08 | 杭州电子科技大学 | Method and system for generating light arbitrary waveform of multiple weighted continuous lights |
| CN114301535B (en) * | 2021-12-29 | 2024-03-26 | 杭州电子科技大学 | Method and system for generating optical arbitrary waveform of multiple weighted continuous lights |
| CN116192173A (en) * | 2023-03-02 | 2023-05-30 | 电子科技大学 | Terahertz channel monitoring receiver based on photoelectric mixer |
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