CN108710248A - The stealthy system of time domain based on time domain Tabo effect - Google Patents
The stealthy system of time domain based on time domain Tabo effect Download PDFInfo
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- CN108710248A CN108710248A CN201810829418.1A CN201810829418A CN108710248A CN 108710248 A CN108710248 A CN 108710248A CN 201810829418 A CN201810829418 A CN 201810829418A CN 108710248 A CN108710248 A CN 108710248A
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F2/00—Demodulating light; Transferring the modulation of modulated light; Frequency-changing of light
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
- H01S3/06725—Fibre characterized by a specific dispersion, e.g. for pulse shaping in soliton lasers or for dispersion compensating [DCF]
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06754—Fibre amplifiers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/10061—Polarization control
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/11—Mode locking; Q-switching; Other giant-pulse techniques, e.g. cavity dumping
- H01S3/1106—Mode locking
- H01S3/1109—Active mode locking
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- Electromagnetism (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- General Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
- Lasers (AREA)
- Optical Communication System (AREA)
Abstract
The invention discloses a kind of stealthy systems of the time domain based on time domain Tabo effect, belong to technical field of photo communication.The stealthy system of the time domain includes：Signal generating device, for generating light pulse and modulating upper signal；Stealthy device meets for introducingDispersion values realize time domain it is stealthy.The time domain average effect of time domain Tabo effect is introduced into stealthy conceptive of time domain by the present invention, it will be redistributed by the energy of the pulse train of the upper strength information of modulation, it is set to be averaged within certain time, the output light obtained in this way will seem consistent in the output light of light source, thereby realize the stealthy effect of time domain.
Description
Technical field
The present invention relates to technical field of photo communication, more particularly to the stealthy system of a kind of time domain based on time domain Tabo effect.
Background technology
Stealthy, this is in the technology for being considered to be present in real world in the past, by the effort of scholars,
It is stealthy in spatial domain or time domain through successfully realizing.On spatial domain it is stealthy mainly make an issue of on material, i.e., by changing
It is stealthy to realize to become refractive index of material etc..And the big heat with invisible clothes on spatial domain, the stealthy concept of time domain are also suggested
Come.
Stealthy time domain refers to the light for being carried by intensity modulated or other modulation systems signal, stealthy by time domain
After system, it will be reduced as the light without ovennodulation, just as the signal in modulation is by stealthy.Time domain is stealthy
Realize that it makes use of nonlinear effects to produce with the Alexander L.Gaeta seminar by Cornell University in 2010 at first
Raw simulated time lens, produce time slot, modulate signals into time band gap, to realize the stealthy of signal.And
In 2013, the Andrew M.Weiner seminar of Purdue University utilized phase-modulator, generates sideband, passes through dispersive optical fiber
Different sidebands is separated in the time domain, time band gap is produced, equally modulates signals into time band gap, to realize
Signal it is stealthy.
Tabo effect most found earlier than 1731 by Taibo, referred to a branch of planar light after a cycle grating,
On its direction of propagation, in different propagation distances, the pattern of periodic can be come out with reproduction.Later, scholar had found, spatial domain
Diffraction and time domain on the mathematical expression of dispersion be consistent, people have just obtained space-time dual character, many spatially general
It reads, such as time lens, Tabo effect etc. have been introduced in time domain.
Invention content
(1) technical problems to be solved
In view of this, the purpose of the present invention is to provide a kind of stealthy system of the time domain based on time domain Tabo effect, with solution
Certainly Tabo effect is utilized to realize the stealthy problem of time domain.
(2) technical solution
According to an aspect of the present invention, a kind of stealthy system of the time domain based on time domain Tabo effect is provided, including：
Signal generating device, for generating light pulse and modulating upper signal；
Stealthy device meets for introducingDispersion values to realize that time domain is stealthy, wherein s is natural number,
T is the repetition period, and β is second order dispersion coefficient, and L is dispersive medium length.
In a further embodiment, the signal generating device includes：
Analog signal generator, for providing clock signal；
Active mode locking laser, connect with analog signal generator, the light pulse constant for output phase, and spectrum is
Pectination；
Bandpass optical filtering device is connect with active mode locking laser, for reducing spectral region；
Polarization Controller is connect with bandpass optical filtering device, the polarization for controlling light；
Event generating means, for generating by stealthy event；
Electric amplifier is connect with event generating means, for amplifying event signal；
Adjustable delay line, connect with Polarization Controller, for being directed at modulated signals with pulse；
Intensity modulator is connect with adjustable delay line, for upper signal to be modulated in light pulse.
In a further embodiment, the stealthy device includes：
Erbium-doped fiber amplifier, for optical signal to be amplified；
Dispersive Devices are connect with erbium-doped fiber amplifier, are met for introducingDispersion values；
Photodetector is connect with Dispersive Devices, the waveform for detection system output.
In a further embodiment, the extinction ratio of the light pulse modulated is 0.5-0.9.
In a further embodiment, the signal of the modulation is periodically or non-periodically signal.
In a further embodiment, the repetition rate of the light pulse sequence is 1-43G Hz.
In a further embodiment, the Dispersive Devices are dispersive optical fiber.
(3) advantageous effect
The stealthy system of the time domain based on time domain Tabo effect of the present invention, will be by the pulse train of the upper strength information of modulation
Energy is redistributed, it is made to be averaged within certain time, and the output light obtained in this way will be in the output of light source
Light seems consistent, to realize the stealthy effect of good time domain.
Description of the drawings
Fig. 1 is the system block diagram of the embodiment of the present invention；
Fig. 2 is the time domain waveform of the output optical pulse of active mode locking laser in the embodiment of the present invention；
Fig. 3 is the time domain waveform that pulse carries cyclical signal by intensity modulator later in the embodiment of the present invention；
Fig. 4 be in the embodiment of the present invention pulse have passed through it is stealthy after light pulse；
Fig. 5 is that length is 2 in impulse modulation in the embodiment of the present invention31The time domain waveform obtained after -1 pseudo-random signal；
Fig. 6 is to have passed through the time domain waveform obtained after the stealthy system of time domain in the embodiment of the present invention.
Specific implementation mode
To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with specific embodiment, and reference
Attached drawing, the present invention is described in more detail.
Tabo effect in time domain refers to identical in phase or the pulse train of the integral multiple of 2 π of difference passes through special color
After the propagation medium for dissipating value, repetition period and amplitude it can reappear pulse sequence according to different multiples on specific position
Row.This is because the spectrum of pulse train is pectination, and between every spectral line between be divided into the repetition rate of pulse, and it is every
The spectral component that a pulse contains is the same, so pulse is by after single order scattering medium, the spectral line of each pulse
By according to the different differences from centre wavelength by different delays.When 1st order chromatic dispersion value meets specific condition, that is, carried
The dispersion measure of confession, which is enough the different spectral lines in each pulse being deferred in certain time interval, mutually to be grown, and there has been Thailand at this time
Primary effect, the Tabo effect of integral multiple need to meet：Wherein s is natural number, and T is the repetition period, and β is second order color
Coefficient is dissipated, L is dispersive medium length.If meeting above-mentioned condition, train of pulse undergo certain dispersive medium propagation after,
The different components of the string of each pulse can be averagely assigned in the pulse at moment around, and here it is the flat of time domain Tabo effect
It acts on, also exactly we realize the stealthy basis of time domain.It is hidden that the time domain average effect of time domain Tabo effect is introduced into time domain
Body it is conceptive, will be redistributed by the energy of the pulse train of the upper strength information of modulation, and make it in certain time range
It is inside averaged, the output light with light source is seemed consistent by the output light obtained in this way, and it is stealthy to thereby realize time domain
Effect.
The present invention provides a kind of stealthy system of the time domain based on time domain Tabo effect (as shown in Figure 1), the stealthy system of the time domain
System includes：Signal generating device and stealthy device.Wherein, signal generating device includes：
Analog signal generator 1, for providing clock signal, while this is also the repetition rate of pulse；
Active mode locking laser 2 is connect with analog signal generator 1, the light pulse constant for output phase, and spectrum
For pectination；The repetition rate of light pulse sequence can be 1-43GHz
Bandpass optical filtering device 3 is connect with active mode locking laser 2, for that can be incited somebody to action for reducing spectral region with reaching
The abbe number of dispersive optical fiber is considered as constant；
Polarization Controller 6 is connect with bandpass optical filtering device 3, and the polarization for controlling light makes its power stability；
Event generating means 4, for generating by stealthy event；
Electric amplifier 5 is connect with event generating means 4, for event signal to be amplified to required modulation depth
Power；
Adjustable delay line 7 is connect with Polarization Controller 6, for being directed at modulated signals with pulse；
Intensity modulator 8 is connect with adjustable delay line 7, for upper signal to be modulated in light pulse.The light exported from laser
After pulse is modulated by intensity modulator, light pulse sequence just carries information.The carrier wave of mode-locked laser outgoing is through ovennodulation
Later, it is still the pectination as the spectrum that laser exports.The extinction ratio of intensity modulated should be between 0.5 to 0.9.
Stealthy device includes：
Erbium-doped fiber amplifier 9 is connect with intensity modulator 8, for optical signal to be amplified；
Dispersive Devices 10 are connect with erbium-doped fiber amplifier 9, are met for introducingDispersion values；Dispersion
Device 10 can be, but not limited to, dispersive optical fiber.With the pulse train of uniform amplitude Taibo is realized by the process of dispersive medium
The mean effort of effect is the same, when the process of propagation experienced special dispersion values(s=1,2,3 ... ..) it
Afterwards, then the different spectral lines among each pulse can be deferred to by linear in the pulse at neighbouring moment.It is all to be delayed to certain
The spectral component at one moment is right to be recombinated to form new pulse, in this case each when the energy of pulse that engraves can be averaged
At the time of being assigned to neighbouring on, be achieved that time domain average effect.By means of time domain average effect, so that it may with to carrying letter
The pulse train of breath it is stealthy.
Photodetector 11 is connect with Dispersive Devices 10, the waveform for detection system output.
In one embodiment of the invention, the time domain waveform of the output optical pulse of active mode locking laser 2 such as Fig. 2 institutes
Show.It is exported from active mode locking laser 2 and passes through intensity modulator 8 later, the time domain waveform obtained after cyclical signal in modulation
As shown in Figure 3, it can be seen that extinction ratio is about 0.5 at this time, and the repetition rate of pulse is 6.61GHz.Stealthy device is introduced
Dispersion be 2850ps/nm, have passed through the time domain waveform obtained after time domain stealth technology as described herein as shown in figure 4, can
To see that it is stealthy well that cyclical signal has been obtained for, become very flat.Therefore, periodic signal can be achieved in the present invention
It is stealthy.
In another embodiment of the present invention, the time domain waveform of the output optical pulse of active mode locking laser 2 is such as
Shown in Fig. 2.Pass through intensity modulator 8 after the output of active mode locking laser 2, length is 2 in modulation31- 1 pseudo-random signal
The time domain waveform obtained afterwards is as shown in figure 5, the repetition rate of its pulse is also 6.61GHz, and extinction ratio is also 0.5 or so.It is stealthy
The introduced dispersion of device is 2850ps/nm, have passed through the time domain waveform obtained after time domain stealth technology as described herein such as
Shown in Fig. 6；.Obviously, any modulation intelligence is can't see in the light pulse of output completely, and the signal in modulation has obtained very well
Hide.Therefore, the stealthy of acyclic signal can be achieved in the present invention.
Particular embodiments described above has carried out further in detail the purpose of the present invention, technical solution and advantageous effect
It describes in detail bright, it should be understood that the above is only a specific embodiment of the present invention, is not intended to restrict the invention, it is all
Within the spirit and principles in the present invention, any modification, equivalent substitution, improvement and etc. done should be included in the guarantor of the present invention
Within the scope of shield.
Claims (7)
1. a kind of stealthy system of time domain based on time domain Tabo effect, which is characterized in that including：
Signal generating device, for generating light pulse and modulating upper signal；
Stealthy device meets for introducingDispersion values to realize that time domain is stealthy, wherein s is natural number, and T is
Repetition period, β are second order dispersion coefficient, and L is dispersive medium length.
2. the stealthy system of a kind of time domain based on time domain Tabo effect according to claim 1, which is characterized in that the letter
Number generating device includes：
Analog signal generator (1), for providing clock signal；
Active mode locking laser (2) is connect with analog signal generator (1), the light pulse constant for output phase, and spectrum
For pectination；
Bandpass optical filtering device (3) is connect with active mode locking laser (2), for reducing spectral region；
Polarization Controller (6) is connect, the polarization for controlling light with bandpass optical filtering device (3)；
Event generating means (4), for generating by stealthy event；
Electric amplifier (5) is connect with event generating means (4), for amplifying event signal；
Adjustable delay line (7) is connect with Polarization Controller (6), for being directed at modulated signals with pulse；
Intensity modulator (8) is connect with adjustable delay line adjustable delay line (7), for upper signal to be modulated in light pulse.
3. the stealthy system of a kind of time domain based on time domain Tabo effect according to claim 1, which is characterized in that described hidden
Body device includes：
Erbium-doped fiber amplifier (9), for optical signal to be amplified；
Dispersive Devices (10) are connect with erbium-doped fiber amplifier (9), are met for introducingDispersion values, wherein
S is natural number, and T is the repetition period, and β is second order dispersion coefficient, and L is dispersive medium length；
Photodetector (11) is connect with Dispersive Devices (10), the waveform for detection system output.
4. the stealthy system of a kind of time domain based on time domain Tabo effect according to claim 1, which is characterized in that the quilt
The extinction ratio of the light pulse of modulation is 0.5-0.9.
5. the stealthy system of a kind of time domain based on time domain Tabo effect according to claim 1, which is characterized in that the tune
The signal of system is periodically or non-periodically signal.
6. the stealthy system of a kind of time domain based on time domain Tabo effect according to claim 5, which is characterized in that the light
The repetition rate of pulse train is 1-43GHz.
7. the stealthy system of a kind of time domain based on time domain Tabo effect according to claim 3, which is characterized in that the color
It is dispersive optical fiber to dissipate device (10).
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111274533A (en) * | 2020-02-24 | 2020-06-12 | 杭州电子科技大学 | Light domain cross-correlation operation method and device based on Talbot effect |
| CN111769875A (en) * | 2020-06-05 | 2020-10-13 | 杭州电子科技大学 | Arbitrary waveform generating device and method based on integer-order time domain Talbot effect |
| CN111987577A (en) * | 2020-06-05 | 2020-11-24 | 南京大学 | All-fiber laser with flexibly multiplied repetition frequency |
| CN113240104A (en) * | 2021-05-27 | 2021-08-10 | 中国科学院半导体研究所 | Serial optical neural network system based on time domain Talbot effect |
| CN113809628A (en) * | 2021-08-16 | 2021-12-17 | 鹏城实验室 | Optical pulse sequence repetition frequency multiplication control device and method |
| CN113985681A (en) * | 2021-10-28 | 2022-01-28 | 中国科学院声学研究所南海研究站 | Time domain cloaking switch based on light intensity modulator and time domain cloaking device |
| CN114268471A (en) * | 2021-12-10 | 2022-04-01 | 中国科学院声学研究所南海研究站 | Optical time domain stealth and encryption device for optical communication system |
| CN114300928A (en) * | 2021-12-31 | 2022-04-08 | 杭州电子科技大学 | Optical frequency comb spacing multiplication method and device |
| CN114338097A (en) * | 2021-12-10 | 2022-04-12 | 中国科学院声学研究所南海研究站 | Transparent and adaptive line type optical time domain cloaking device and cloaking method |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111274533B (en) * | 2020-02-24 | 2023-04-07 | 杭州电子科技大学 | Light domain cross-correlation operation method and device based on Talbot effect |
| CN111274533A (en) * | 2020-02-24 | 2020-06-12 | 杭州电子科技大学 | Light domain cross-correlation operation method and device based on Talbot effect |
| CN111769875A (en) * | 2020-06-05 | 2020-10-13 | 杭州电子科技大学 | Arbitrary waveform generating device and method based on integer-order time domain Talbot effect |
| CN111987577A (en) * | 2020-06-05 | 2020-11-24 | 南京大学 | All-fiber laser with flexibly multiplied repetition frequency |
| CN113240104A (en) * | 2021-05-27 | 2021-08-10 | 中国科学院半导体研究所 | Serial optical neural network system based on time domain Talbot effect |
| CN113240104B (en) * | 2021-05-27 | 2023-11-14 | 中国科学院半导体研究所 | Time domain Talbot effect-based serial optical neural network system |
| CN113809628A (en) * | 2021-08-16 | 2021-12-17 | 鹏城实验室 | Optical pulse sequence repetition frequency multiplication control device and method |
| CN113985681A (en) * | 2021-10-28 | 2022-01-28 | 中国科学院声学研究所南海研究站 | Time domain cloaking switch based on light intensity modulator and time domain cloaking device |
| CN113985681B (en) * | 2021-10-28 | 2024-02-27 | 中国科学院声学研究所南海研究站 | Time domain stealth switch and time domain stealth device based on light intensity modulator |
| CN114268471A (en) * | 2021-12-10 | 2022-04-01 | 中国科学院声学研究所南海研究站 | Optical time domain stealth and encryption device for optical communication system |
| CN114338097A (en) * | 2021-12-10 | 2022-04-12 | 中国科学院声学研究所南海研究站 | Transparent and adaptive line type optical time domain cloaking device and cloaking method |
| CN114338097B (en) * | 2021-12-10 | 2024-04-26 | 中国科学院声学研究所南海研究站 | Transparent self-adaptive line type optical time domain stealth device and stealth method |
| CN114300928A (en) * | 2021-12-31 | 2022-04-08 | 杭州电子科技大学 | Optical frequency comb spacing multiplication method and device |
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| CN108710248B (en) | 2020-09-08 |
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