CN108710248B - Time domain cloaking system based on time domain Talbot effect - Google Patents
Time domain cloaking system based on time domain Talbot effect Download PDFInfo
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- CN108710248B CN108710248B CN201810829418.1A CN201810829418A CN108710248B CN 108710248 B CN108710248 B CN 108710248B CN 201810829418 A CN201810829418 A CN 201810829418A CN 108710248 B CN108710248 B CN 108710248B
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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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- 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
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- 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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- 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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Abstract
The invention discloses a time domain cloaking system based on a time domain Talbot effect, and belongs to the technical field of optical communication. The time domain cloaking system comprises: a signal generating device for generating an optical pulse and modulating the upper signal; cloaking device for introducing coincidence
The dispersion value of (a) achieves time domain stealth. The invention introduces the time domain average effect of the time domain Talbot effect to the concept of time domain stealth, redistributes the energy of the pulse sequence modulated with the intensity information, and enables the pulse sequence to obtain average within a certain time range, so that the obtained output light looks consistent with the output light of the light source, and the time domain stealth effect is realized.
Description
Technical Field
The invention relates to the technical field of optical communication, in particular to a time domain cloaking system based on a time domain Talbot effect.
Background
Stealth, a technique that was thought to be impossible in the real world in the past, has been successful in achieving spatial or temporal stealth through the efforts of scholars. The stealth in the space domain is mainly made on materials, namely, the stealth is realized by changing the refractive index of the materials and the like. The concept of temporal stealth is also proposed with the intense heat of the stealth in the spatial domain.
The time domain stealth refers to light carrying signals through intensity modulation or other modulation modes, and after passing through a time domain stealth system, the light is restored to be the same as the light without modulation, and the signal on modulation is stealthed. Time-domain stealth is realized by Alexander l.gaeta research group of cornell university in 2010 at first, a nonlinear effect is utilized to generate a simulated time lens, a time gap is generated, and a signal is modulated on a time band gap, so that the stealth of the signal is realized. In 2013, Andrew m.weiner research group at the university of general ferry utilizes a phase modulator to generate sidebands, different sidebands are separated in the time domain through a dispersion fiber to generate a time band gap, and a signal is modulated on the time band gap, so that the stealth of the signal is realized.
The talbot effect, originally discovered by talbot in 1731, means that after a beam of planar light passes through a periodic grating, the pattern of the periodic grating will reappear at different propagation distances in the propagation direction. Later, the scholars found that the mathematical expressions of spatial diffraction and temporal dispersion were consistent, one gained spatial-temporal duality, and many spatial concepts, such as temporal lenses, Talbot effects, etc., were introduced in the temporal domain.
Disclosure of Invention
Technical problem to be solved
In view of the above, the present invention provides a time domain cloaking system based on the time domain talbot effect to solve the problem of time domain cloaking realized by using the talbot effect.
(II) technical scheme
According to an aspect of the present invention, there is provided a time domain cloaking system based on the time domain talbot effect, including:
a signal generating device for generating an optical pulse and modulating the upper signal;
cloaking device for introducing coincidence
The dispersion value of (a) to achieve time domain cloaking, where s is a natural number, T is a repetition period, β is a second-order dispersion coefficient, and L is a dispersion medium length.
In a further embodiment, the signal generating device comprises:
an analog signal generator for providing a clock signal;
the active mode-locked laser is connected with the analog signal generator and used for outputting optical pulses with constant phases, and the spectrum is comb-shaped;
the band-pass optical filter is connected with the active mode-locked laser and is used for reducing the spectral range;
the polarization controller is connected with the band-pass optical filter and is used for controlling the polarization of light;
event generating means for generating a stealthed event;
the electric amplifier is connected with the event generating device and is used for amplifying the event signal;
an adjustable delay line connected to the polarization controller for aligning the modulated signal with the pulse;
and the intensity modulator is connected with the adjustable delay line and is used for modulating the optical pulse to the signal.
In a further embodiment, the cloaking device comprises:
the erbium-doped fiber amplifier is used for amplifying optical signals;
a dispersive device connected with the erbium-doped fiber amplifier for introducing the signals
A dispersion value of;
and the photoelectric detector is connected with the dispersion device and is used for detecting the waveform output by the system.
In a further embodiment, the modulated optical pulses have an extinction ratio of 0.5 to 0.9.
In further embodiments, the modulated signal is a periodic or aperiodic signal.
In a further embodiment, the repetition frequency of the sequence of light pulses is in the range of 1 to 43G Hz.
In a further embodiment, the dispersive device is a dispersive optical fiber.
(III) advantageous effects
The time domain Talbot effect-based time domain cloaking system redistributes the energy of the pulse sequence modulated with the intensity information to ensure that the energy is averaged in a certain time range, so that the obtained output light looks consistent with the output light of a light source, and a good time domain cloaking effect is realized.
Drawings
FIG. 1 is a system block diagram of an embodiment of the present invention;
FIG. 2 is a time domain waveform of an output optical pulse of an active mode-locked laser in an embodiment of the present invention;
FIG. 3 is a time domain waveform carrying a periodic signal after a pulse passes through an intensity modulator in an embodiment of the present invention;
FIG. 4 is a light pulse after the pulse has been stealthed in an embodiment of the present invention;
FIG. 5 shows an embodiment of the present invention in which the pulse modulation has a length of 231-1 time domain waveform obtained after the pseudo-random signal;
fig. 6 is a time domain waveform obtained after passing through a time domain cloaking system in an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to specific embodiments and the accompanying drawings.
The talbot effect in the time domain means that after pulse sequences which are identical in phase or differ by integer multiples of 2 pi pass through a propagation medium with a specific dispersion value, the pulse sequences can be reproduced at specific positions with repetition periods and amplitudes according to different multiples. This is because the spectrum of the pulse train is comb-shaped and the spacing between each line is the repetition frequency of the pulses, and each pulse contains the same spectral components, so that the lines of each pulse are delayed differently by different differences from the center wavelength after the pulse passes through the first-order scattering medium. When the first order dispersion value satisfies a certain condition, i.e. the dispersion is provided in an amount sufficient to delay the different spectral lines in each pulse to be longer over a certain time interval, the talbot effect is present, and integer multiples of the talbot effect need to satisfy:
where s is a natural number, T is a repetition period, β is a second-order dispersion coefficient, and L is a dispersion mediumMass length. If the above conditions are satisfied, after the pulse train is propagated through a certain dispersive medium, different components of the train of each pulse are evenly distributed to the pulses at the surrounding time, which is the averaging effect of the time domain talbot effect and is the basis for realizing the time domain stealth. The time domain average effect of the time domain Talbot effect is introduced to the concept of time domain stealth, the energy of the pulse sequence with the modulated intensity information is redistributed to be averaged in a certain time range, and the obtained output light looks consistent with the output light of the light source, so that the time domain stealth effect is realized.
The invention provides a time domain cloaking system (as shown in figure 1) based on time domain Talbot effect, comprising: a signal generating device and a cloaking device. Wherein the signal generating device includes:
an analog signal generator 1 for providing a clock signal, which is also the repetition frequency of the pulses;
the active mode-locked laser 2 is connected with the analog signal generator 1 and used for outputting optical pulses with constant phases, and the optical spectrum is comb-shaped; the repetition frequency of the optical pulse sequence may be 1-43 GHz
The band-pass optical filter 3 is connected with the active mode-locked laser 2 and is used for reducing the spectral range so as to enable the dispersion coefficient of the dispersion optical fiber to be regarded as a constant;
the polarization controller 6 is connected with the band-pass optical filter 3 and used for controlling the polarization of light and stabilizing the power of the light;
event generating means 4 for generating a stealthed event;
an electrical amplifier 5 connected to the event generating means 4 for amplifying the event signal to a power of a desired modulation depth;
an adjustable delay line 7 connected to the polarization controller 6 for aligning the modulated signal with the pulses;
and the intensity modulator 8 is connected with the adjustable delay line 7 and is used for modulating the optical pulse to the signal. The optical pulse train carries information after the optical pulse output from the laser is modulated by the intensity modulator. After being modulated, the carrier emitted by the mode-locked laser still has a comb shape which is the same as the spectrum output by the laser. The extinction ratio of the intensity modulation should be between 0.5 and 0.9.
The cloaking device comprises:
the erbium-doped optical fiber amplifier 9 is connected with the intensity modulator 8 and is used for amplifying the optical signal;
a dispersion device 10 connected to the erbium-doped fiber amplifier 9 for introducing the coincidence
A dispersion value of; the dispersive device 10 may be, but is not limited to, a dispersive optical fiber. The process of propagation experiences a special dispersion value as well as the averaging effect of the Talbot effect achieved by the process of pulse sequence with uniform amplitude passing through the dispersive medium
( s 1,2, 3.) then the different spectral lines in each pulse are linearly delayed to the pulses of adjacent time instants. All spectral components delayed to a certain time will recombine to form a new pulse, so that the energy of the pulse at each time is equally distributed to adjacent times, thereby realizing the time-domain averaging effect. By means of the time domain averaging effect, the stealth of the pulse sequence carrying the information is possible.
And the photoelectric detector 11 is connected with the dispersion device 10 and is used for detecting the waveform output by the system.
In one embodiment of the present invention, the time domain waveform of the output optical pulse of the active mode-locked laser 2 is shown in fig. 2. The time domain waveform obtained by modulating the periodic signal through the intensity modulator 8 after being output from the active mode-locked laser 2 is shown in fig. 3, and it can be seen that the extinction ratio is about 0.5 at this time, and the repetition frequency of the pulse is 6.61 GHz. The chromatic dispersion introduced by the cloaking device is 2850ps/nm, and a time domain waveform obtained after the time domain cloaking technology is shown in fig. 4, so that a periodic signal is well cloaked and becomes flat. Therefore, the invention can realize the stealth of the periodic signal.
In another embodiment of the present invention, the time domain waveform of the output optical pulse of the active mode-locked laser 2 is shown in fig. 2. The output of the active mode-locked laser 2 passes through an intensity modulator 8, and the modulation length is 231The time domain waveform obtained after the pseudo-random signal of-1 is shown in FIG. 5, the pulse repetition frequency is also 6.61GHz, and the extinction ratio is also around 0.5. The chromatic dispersion introduced by the cloaking device is 2850ps/nm, and the time domain waveform obtained after the time domain cloaking technology is described in the text is shown in fig. 6; . Obviously, the output light pulse does not see any modulation information at all, and the signal on the modulation is well hidden. Therefore, the invention can realize the stealth of the aperiodic signal.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. A time-domain cloaking system based on the time-domain talbot effect, comprising:
a signal generating device for generating an optical pulse and modulating the upper signal;
cloaking device for introducing coincidence
The dispersion value of (a) to achieve time domain stealth, where s is a natural number, T is a repetition period, β is a second-order dispersion coefficient, and L is a dispersion medium length;
wherein the signal generating device includes:
an analog signal generator (1) for providing a clock signal;
the active mode-locked laser (2) is connected with the analog signal generator (1) and used for outputting optical pulses with constant phases, and the optical spectrum is comb-shaped;
the band-pass optical filter (3) is connected with the active mode-locked laser (2) and is used for reducing the spectral range;
the polarization controller (6) is connected with the band-pass optical filter (3) and is used for controlling the polarization of light;
event generating means (4) for generating a stealthed event;
the electric amplifier (5) is connected with the event generating device (4) and is used for amplifying the event signal;
an adjustable delay line (7) connected to the polarization controller (6) for aligning the modulated signal with the pulses;
the intensity modulator (8) is connected with the adjustable delay line (7) of the adjustable delay line and is used for modulating the optical pulse to a signal;
the cloaking device comprises:
an erbium-doped fiber amplifier (9) for amplifying the optical signal;
a dispersive device (10) connected to the erbium doped fiber amplifier (9) for introducing the coincidence
Wherein s is a natural number, T is a repetition period, β is a second-order dispersion coefficient, and L is a dispersion medium length;
and the photoelectric detector (11) is connected with the dispersion device (10) and is used for detecting the waveform output by the system.
2. The time domain Talbot effect based time domain cloaking system as claimed in claim 1, wherein the extinction ratio of the modulated light pulses is 0.5-0.9.
3. The time-domain Talbot effect-based time-domain cloaking system as claimed in claim 1, wherein the modulated signal is periodic or aperiodic.
4. The time-domain Talbot effect-based time-domain cloaking system as claimed in claim 3, wherein the repetition frequency of the optical pulse sequence is 1-43 GHz.
5. A time domain cloaking system based on the time domain talbot effect as claimed in claim 1, characterized in that the dispersive device (10) is a dispersive optical fiber.
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| 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 |
| CN111987577B (en) * | 2020-06-05 | 2021-09-10 | 南京大学 | All-fiber laser with flexibly multiplied repetition frequency |
| 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 |
| 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 |
| CN113809628B (en) * | 2021-08-16 | 2022-12-13 | 鹏城实验室 | Optical pulse sequence repetition frequency multiplication control device and method |
| 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 |
| CN114268471B (en) * | 2021-12-10 | 2022-10-14 | 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 |
| 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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