A spatiotemporal wave packet modulation signal generation and anti-turbulence optical communication device

Abstract

A spatiotemporal wave packet modulation signal generation and anti-turbulence optical communication device, belonging to the field of optical system technology, addresses the problems existing in the prior art. The device includes: a 1530nm laser, an electro-optic modulator, a signal generator, an erbium-doped fiber amplifier (EDFA), a first polarization isolator, a 1530nm / 1625nm wavelength division multiplexer, a highly nonlinear fiber, a first polarization controller, a second polarization isolator, an output coupler, a dispersion-compensating fiber, a circulator, a semiconductor saturable absorber mirror (SESAM), a second polarization controller, a chirped pulse fiber amplifier (CPA), a first collimator, a first diffraction grating, a first cylindrical lens, a multi-phase plane, a plane mirror, a second cylindrical lens, a second diffraction grating, a spherical lens, a cubic beam splitter, a CMOS beam analyzer, a collimating and expanding lens group, a receiving antenna, a power meter, a photodetector, and a field-programmable gate array (FPGA). This device achieves stable signal transmission.

Description

Technical Field

[0001] This invention belongs to the field of optical system technology, specifically relating to a spatiotemporal wave packet modulation signal generation and anti-turbulence optical communication device. This device is suitable for scenarios affected by atmospheric turbulence, such as atmospheric laser communication, lidar, and long-range optical imaging. Background Technology

[0002] In the field of free-space optical communication, atmospheric turbulence causes many problems during the propagation of light beams, including light intensity fluctuations, beam drift, phase distortion, and beam spread. These problems affect the stability of beam transmission and severely reduce its transmission quality and communication performance, especially in complex weather and atmospheric environments.

[0003] To address these issues, existing anti-turbulence methods mainly include active compensation techniques, passive optical field manipulation techniques, and signal processing techniques. Among these, spatiotemporal wave packets, as a special optical field localized in the spatiotemporal domain, fall under the category of non-diffraction beam transmission techniques in passive optical field manipulation. This is an important technical direction in anti-atmospheric turbulence methods. Its core advantage lies in overcoming the limitation of traditional non-diffraction beams, which can only achieve propagation invariance in the spatial domain, by controlling the coupling relationship between the spatial and temporal dimensions. This allows for the realization of spatiotemporal coordinated propagation invariance and self-restoring characteristics.

[0004] Chinese patent publication number "CN113534475A" is titled "Method for Generating Bessel Spatiotemporal Wave Packets and Bessel Spatiotemporal Vortex Wave Packets." This method involves incidenting a collimated femtosecond pulse onto a synthesizer composed of a beam splitter, a collimator, and a phase modulation element. Within this synthesizer, a designed composite phase, including a conical phase, a dispersive phase, a quadratic phase, and an optional spiral phase, is applied to the space-frequency joint domain of the pulse. The modulated pulse propagates in free space over a specific distance after the synthesizer and evolves into a Bessel spatiotemporal vortex wave packet. However, this method still has certain limitations in practical application. The constructed spatiotemporal wave packet cannot be applied to space laser communication, lacks a complete free-space beam transmission system architecture, and particularly lacks a time-domain modulation signal structure for generating femtosecond pulse widths. Since it synthesizes the spatiotemporal vortex wave packet using a single phase modulation element, the resulting wave packet has poor phase and spatiotemporal accuracy due to limitations in the accuracy of the phase modulation element. Summary of the Invention

[0005] To address the limitations of existing spatiotemporal wave packets in space laser communication and their poor generation accuracy, this invention proposes a spatiotemporal wave packet modulation signal generation and anti-turbulence optical communication device. This device synthesizes femtosecond spatiotemporal optical wave packets carrying modulation information, fully utilizing their stable transverse optical field distribution and strong self-healing capabilities in atmospheric turbulence channels to achieve stable signal transmission in free-space optical communication.

[0006] To achieve the above objectives, the technical solution of the present invention is as follows:

[0007] A spatiotemporal wave packet modulation signal generation and anti-turbulence optical communication device includes: a 1530nm laser, an electro-optic modulator, a signal generator, an erbium-doped fiber amplifier (EDFA), a first polarization isolator, a 1530nm / 1625nm wavelength division multiplexer, a highly nonlinear fiber, a first polarization controller, a second polarization isolator, an output coupler, a dispersion-compensating fiber, a circulator, a semiconductor saturable absorber mirror (SESAM), a second polarization controller, a chirped pulse fiber amplifier (CPA), a first collimator, a first diffraction grating, a first cylindrical lens, a multi-phase plane, a plane mirror, a second cylindrical lens, a second diffraction grating, a spherical lens, a cubic beam splitter, a CMOS beam analyzer, a collimating and expanding lens group, a receiving antenna, a power meter, a photodetector, and a field-programmable gate array (FPGA).

[0008] The 1530nm laser and signal generator are connected to the electro-optic modulator via optical fiber. The electro-optic modulator, erbium-doped fiber amplifier (EDFA), first polarization isolator, and 1530nm / 1625nm wavelength division multiplexer are sequentially connected via optical fiber. The 1530nm / 1625nm wavelength division multiplexer, highly nonlinear fiber, first polarization controller, second polarization isolator, output coupler, dispersion compensation fiber, circulator, and semiconductor saturable absorber mirror (SESAM) are sequentially connected to form a ring resonant cavity. The output end of the output coupler, second polarization controller, chirped pulse fiber amplifier (CPA), and first collimator are sequentially connected via optical fiber. The light emitted from the first collimator is incident on the first diffraction grating. The first diffraction grating is tilted at 27.6° to the optical axis of the first collimator and is located at the front focal plane of the first cylindrical lens; the multi-phase plane with the plane mirror is located at the rear focal plane of the first cylindrical lens and the front focal plane of the second cylindrical lens; the second diffraction grating is located at the rear focal plane of the second cylindrical lens and is tilted at 27.6° relative to the optical axis of the second cylindrical lens; the light emitted from the second diffraction grating is coaxial with the spherical lens, the cubic beam splitter and the collimating beam expander group; a beam analyzer CMOS is set in the direction perpendicular to the optical axis of the cubic beam splitter; the receiving antenna receives the beam emitted from the collimating beam expander group, and the receiving antenna is connected to the power meter and the photodetector respectively; the photodetector is connected to the field programmable gate array (FPGA).

[0009] The multi-phase plane is formed by etching different phase patterns on a phase plane to achieve modulation and shaping of pulse beams.

[0010] The collimating beam expander assembly is a Galilean collimating beam expander structure, used to achieve collimated emission with low aberrations.

[0011] The beneficial effects of this invention are:

[0012] 1) The invention proposes a device for high-speed modulation pump light pumping based on a semiconductor saturable absorber Raman laser, which generates femtosecond optical pulses with high-speed modulation information. The modulation rate can reach 10Gbps and above, which solves the difficulty of combining high-speed modulation signal modulation and femtosecond optical pulses, and also meets the femtosecond pulse requirements of spatiotemporal wave packets.

[0013] 2) The invention proposes different phase patterns for multi-phase plane continuous loading design, which realizes the spatiotemporal shaping and locking of spatiotemporal wave packets and superposition with other phases (Bessel phase, hypergeometric Gaussian phase, Airy-like hypergeometric Gaussian phase, etc.) with high precision, thereby improving its spatiotemporal phase accuracy. Attached Figure Description

[0014] Figure 1 A schematic diagram of a spatiotemporal wave packet modulation signal generation and anti-turbulence optical communication device according to the present invention;

[0015] Figure 2 This is a schematic diagram of a multi-plane optical converter structure consisting of a multi-phase plane and a plane mirror.

[0016] Figure 3 The optical field distribution of the spatiotemporal wave packet and the Gaussian beam before and after passing through the turbulent channel is shown.

[0017] Figure 4 (a) shows the power jitter measurement of the spatiotemporal wave packet after passing through the turbulent channel; (b) shows the power jitter measurement of the Gaussian beam after passing through the turbulent channel.

[0018] Figure 5 (a) shows the centroid drift measurement of the spatiotemporal wave packet after passing through the turbulent channel; (b) shows the centroid drift measurement of the Gaussian beam after passing through the turbulent channel. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the accompanying drawings.

[0020] like Figure 1As shown, a spatiotemporal wave packet modulation signal generation and anti-turbulence optical communication device includes: a 1530nm laser 1, an electro-optic modulator 2, a signal generator 3, an erbium-doped fiber amplifier (EDFA) 4, a first polarization isolator 5, a 1530nm / 1625nm wavelength division multiplexer 6, a highly nonlinear fiber 7, a first polarization controller 8, a second polarization isolator 9, an output coupler 10, a dispersion-compensating fiber 11, a circulator 12, a semiconductor saturable absorber mirror (SESAM) 13, a second polarization controller 14, a chirped pulse fiber amplifier (CPA) 15, a first collimator 16, a first diffraction grating 17, a first cylindrical lens 18, a multi-phase plane 19, a plane mirror 20, a second cylindrical lens 21, a second diffraction grating 22, a spherical lens 23, a cubic beam splitter 24, a CMOS beam analyzer 25, a collimating and beam-expanding lens group 26, a receiving antenna 27, a power meter 28, a photodetector 29, and a field-programmable gate array (FPGA) 30.

[0021] The multi-phase plane 19 is formed by etching different phase patterns on a phase plane to achieve modulation and shaping of the pulse beam.

[0022] The collimating beam expander group 26 is a Galilean collimating beam expander system, which consists of two separate spherical concave lenses and aspherical convex lenses, used to achieve collimated emission with low aberration.

[0023] A 1530nm laser 1 and a signal generator 3 are connected to an electro-optic modulator 2 via optical fibers. The electro-optic modulator 2, an erbium-doped fiber amplifier (EDFA) 4, a first polarization isolator 5, and a 1530nm / 1625nm wavelength division multiplexer 6 are connected via optical fibers. The 1530nm / 1625nm wavelength division multiplexer 6, a highly nonlinear fiber 7, a first polarization controller 8, a second polarization isolator 9, an output coupler 10, a dispersion-compensating fiber 11, a circulator 12, and a semiconductor saturable absorber mirror (SESAM) 13 are sequentially connected to form a ring resonant cavity. The output end of the output coupler 10, the second polarization controller 14, a chirped pulse fiber amplifier (CPA) 15, and a first collimator 16 are sequentially connected via optical fibers. The light emitted from the first collimator 16 is incident on a first diffraction grating 17, which is tilted 27.6° relative to the optical axis of the first collimator 16 and located at the front focal plane of the first cylindrical lens 18. A multi-phase plane 19, in conjunction with a plane mirror 20, is located at the rear focal plane of the first cylindrical lens 18 and the front focal plane of the second cylindrical lens 21. A second diffraction grating 22 is located at the rear focal plane of the second cylindrical lens 21 and is tilted 27.6° relative to the optical axis of the second cylindrical lens 21. The light emitted from the second diffraction grating 22 is coaxial with the spherical lens 23, the cubic beam splitter 24, and the collimating beam expander group 26. A beam analyzer CMOS 25 is positioned perpendicular to the optical axis of the cubic beam splitter 24. A receiving antenna 27 receives the beam emitted from the collimating beam expander group 26. The receiving antenna 27 is connected to a power meter 28 and a photodetector 29, which is connected to a field-programmable gate array (FPGA) 30.

[0024] The continuous laser output from the 1530nm laser 1 is transmitted via optical fiber to the electro-optic modulator 2. The electro-optic modulator 2 modulates the laser amplitude or phase according to the external control signal applied by the signal generator 3, generating a modulated laser signal that meets communication requirements. The modulated laser signal is injected into the erbium-doped fiber amplifier EDFA4 through optical fiber. After being amplified by the erbium-doped fiber amplifier 4, it enters the first polarization isolator 5 to ensure unidirectional signal transmission. The amplified modulated signal is transmitted via optical fiber to the 1530 / 1625nm wavelength division multiplexer 6. After passing through the highly nonlinear fiber 7, it generates 1625nm Stokes light. The 1625nm Stokes light is adjusted by the first polarization controller 8 to change its polarization state. Then, the optical signal is transmitted forward along the second polarization isolator 9 to suppress backscattered light and avoid interference with the pump source and mode locking. The 90% port of the output coupler 10 is connected to the dispersion compensation fiber 11 to achieve near-zero net dispersion control within the cavity. The dispersion-compensated optical signal enters port a of circulator 12, port b is connected to semiconductor saturable absorber mirror SESAM13, triggering saturable absorption effect, the pulse edge is absorbed and the peak is retained, realizing pulse width narrowing, port c is connected to 1530nm / 1625nm wavelength division multiplexer 6, forming a ring cavity Raman femtosecond laser structure, and outputs from port 10 of output coupler 10.

[0025] The femtosecond modulated optical pulse signal output from the 10% port of the output coupler 10 changes its polarization state through the second polarization controller 14 and enters the chirped pulse fiber amplifier CPA15 for power amplification. The amplified signal is then connected to the first collimator 16 for collimation via an optical fiber. The collimated femtosecond modulated optical pulse signal is incident on the first diffraction grating 17 for spectral expansion, so that light of different frequencies exits at different angles. After being dispersed by the grating, the light exits in parallel through the first cylindrical lens 18 and is focused onto the multi-phase plane 19 located at the back focal plane. Multiple phase patterns are sequentially loaded onto the multi-phase plane 19. After the optical signal passes through the first phase pattern on the multi-phase plane 19, it is reflected onto the plane mirror 20. The optical signal reflected by the plane mirror 20 is then incident on the second phase pattern on the multi-phase plane 19. After multiple modulation-reflection-modulation cycles, high-precision control of the spatial frequency domain phase of the femtosecond modulated spatiotemporal optical pulse signal is achieved. Finally, the femtosecond-modulated spatiotemporal optical pulse signal, after phase modulation, is reflected by the multi-phase plane 19 to the second cylindrical lens 21, which outputs the optical signal in parallel and focuses it onto the second diffraction grating 22. All optical signals with different spatial angles and wavelengths are re-diffracted into the same direction, realizing time Fourier transform and completing spatial frequency domain modulation. The output pulse optical signal, which is combined in the spatial domain and shaped in the time domain, is incident on the spherical lens 23, realizing spatial Fourier transform. The spatiotemporal phase information encoded in the beam angular spectrum is converted into a spatially visible intensity distribution pattern through diffraction and interference, thereby generating a femtosecond spatiotemporal optical pulse wave packet carrying the modulation signal at the back focal plane of the spherical lens 23.

[0026] The femtosecond spatiotemporal optical pulse packet of the modulated signal is split into two beams by the cube beam splitter 24. One beam enters the beam analyzer CMOS 25 to collect light intensity distribution information; the other beam enters the collimating beam expander group 26 to form a femtosecond modulated spatiotemporal optical pulse packet for long-distance transmission. After passing through the atmospheric turbulence channel, the receiving antenna 27 couples the femtosecond modulated spatiotemporal optical pulse packet transmitted in space into the optical fiber. One beam enters the power meter 28 to collect power information, and the other beam enters the photodetector 29 and is connected to the field programmable gate array FPGA 30 to realize signal demodulation.

[0027] Example:

[0028] This invention establishes a test platform for spatiotemporal wave packet generation and indoor turbulent channel transmission, verifying the feasibility of the device of this invention.

[0029] like Figure 2As shown, a multi-plane optical converter is composed of a multi-phase plane 19 and a plane mirror 20. This structure is a free-space device, employing a multi-cavity structure. Beam modulation is achieved through multiple cycles between the multi-phase plane 19 and the plane mirror 20. The incident light first travels a distance in free space to reach the phase... Figure 1 At the point where the phase is modulated, it is reflected onto the plane mirror 20, and after being reflected by the plane mirror 20, it is transmitted a distance in free space to the phase. Figure 2 This process continues until the last phase map is reached, followed by a free-space transmission before being launched to the intended location.

[0030] like Figure 3 The figure shows a comparison of the optical field distributions of the spatiotemporal wave packet and the Gaussian beam before and after transmission through the turbulent channel. The experiment used a CMOS25 beam analyzer to acquire the optical field distributions of the spatiotemporal wave packet and the Gaussian beam before and after transmission through the turbulent channel. Figure 3 The left column shows the light field distribution of the spatiotemporal wave packet and the Gaussian beam before passing through the turbulent channel. Due to its unique phase structure and light intensity distribution characteristics, the spatiotemporal wave packet has a relatively uniform light intensity distribution in the central region, with an elliptical ring structure around it. The overall light spot is similar to a grain of rice placed horizontally. The light intensity of the Gaussian beam exhibits a typical Gaussian distribution in the cross-section, with the strongest light intensity at the center. As the distance from the center increases, the light intensity rapidly decreases in an exponential manner, and the overall light spot is circular. Figure 3 The right column shows the optical field distribution of the spatiotemporal wave packet and the Gaussian beam after passing through the turbulent channel. Significant differences exist between the two. Due to the random phase changes caused by atmospheric turbulence, the wavefront of the Gaussian beam is severely distorted, resulting in an extremely uneven intensity distribution with obvious diffusion and gaps, deviating significantly from its original Gaussian distribution. Even though the spatiotemporal wave packet is partially deviated due to scattering and interference from turbulence, its self-healing and non-diffraction properties ensure a relatively complete optical field distribution after passing through the simulated turbulence.

[0031] like Figure 4 The figure shows a comparison of the power jitter of the spatiotemporal wave packet and the Gaussian beam after transmission through a turbulent channel. A high-precision power meter 28 was used to collect the power time-series data of the spatiotemporal wave packet and the Gaussian beam after transmission through the turbulent channel, and the power jitter characteristics of the spatiotemporal wave packet and the Gaussian beam were compared and analyzed. Figure 4 As shown in (a), the power jitter range of the spatiotemporal wave packet is only 0.5 dB, and the standard deviation of the power jitter is 0.08834. Figure 4As shown in (b), the jitter range of the Gaussian beam is as high as 12 dB, and the standard deviation of power jitter is 2.52568. The power jitter range of the spatiotemporal wave packet is 11.5 dB lower than that of the Gaussian beam, and the standard deviation of power jitter is only 3.5% of that of the Gaussian beam, indicating significantly lower dispersion in its power time series. Both the spatiotemporal wave packet and the Gaussian beam exhibit varying degrees of power fluctuation, but the jitter resistance of the spatiotemporal wave packet is significantly better than that of the Gaussian beam.

[0032] like Figure 5 The image shows a comparison of the centroid drift of the spatiotemporal wave packet and the Gaussian beam after passing through a turbulent channel. The experiment used a beam analyzer to record the lateral intensity distribution of the spatiotemporal wave packet and the Gaussian beam after transmission through the turbulent channel at 1fps, recording 50 frames. All frames were imported into MATLAB for data processing to calculate the centroid drift positions of the spatiotemporal wave packet and the Gaussian beam. Figure 5 As shown in (a), the average centroid drift of the spacetime wave packet is 28.89 μm, and the standard deviation of the centroid drift jitter is 136.95. Figure 5 As shown in (b), the average centroid drift of the Gaussian beam is 54.78 μm, and the standard deviation of the centroid drift jitter is 441.05. The centroid positions of both the spacetime wave packet and the Gaussian beam show different degrees of drift, but the centroid drift range of the spacetime wave packet is reduced by 44.44%.

Claims

1. A spatiotemporal wave packet modulation signal generation and anti-turbulence optical communication device, characterized in that, The device includes: a 1530nm laser (1), an electro-optic modulator (2), a signal generator (3), an erbium-doped fiber amplifier (EDFA) (4), a first polarization isolator (5), a 1530nm / 1625nm wavelength division multiplexer (6), a highly nonlinear fiber (7), a first polarization controller (8), a second polarization isolator (9), an output coupler (10), a dispersion-compensating fiber (11), a circulator (12), a semiconductor saturable absorber mirror (SESAM) (13), and a second polarization controller (14). Chirped pulse fiber amplifier (CPA) (15), first collimator (16), first diffraction grating (17), first cylindrical lens (18), multiphase plane (19), plane mirror (20), second cylindrical lens (21), second diffraction grating (22), spherical lens (23), cube beam splitter (24), beam analyzer CMOS (25), collimating beam expander group (26), receiving antenna (27), power meter (28), photodetector (29), and field programmable gate array (FPGA) (30); A 1530nm laser (1) and a signal generator (3) are connected to an electro-optic modulator (2) via optical fiber. The electro-optic modulator (2), an erbium-doped fiber amplifier (EDFA) (4), a first polarization isolator (5), and a 1530nm / 1625nm wavelength division multiplexer (6) are connected via optical fiber in sequence. The 1530nm / 1625nm wavelength division multiplexer (6), a highly nonlinear fiber (7), a first polarization controller (8), a second polarization isolator (9), an output coupler (10), a dispersion compensation fiber (11), a circulator (12), and a semiconductor saturable absorber mirror (SESAM) (13) are connected via optical fiber in sequence to form a ring resonant cavity. The output end of the output coupler (10), the second polarization controller (14), the chirped pulse fiber amplifier (CPA) (15), and the first collimator (16) are connected via optical fiber in sequence. The light emitted from the first collimator (16) is incident on the first diffraction grating (17). 7) The first collimator (16) is tilted at 27.6° to the optical axis and located at the front focal plane of the first cylindrical lens (18); the multi-phase plane (19) is located at the back focal plane of the first cylindrical lens (18) and the front focal plane of the second cylindrical lens (21) in conjunction with the plane mirror (20); the second diffraction grating (22) is located at the back focal plane of the second cylindrical lens (21) and tilted at 27.6° relative to the optical axis of the second cylindrical lens (21); the light emitted from the second diffraction grating (22) is coaxial with the spherical lens (23), the cubic beam splitter (24) and the collimating beam expander group (26), and a beam analyzer CMOS (25) is set in the direction perpendicular to the optical axis of the cubic beam splitter (24); the receiving antenna (27) receives the beam emitted from the collimating beam expander group (26), and the receiving antenna (27) is connected to the power meter (28) and the photodetector (29) respectively, and the photodetector (29) is connected to the field programmable gate array (FPGA) (30).

2. The spatiotemporal wave packet modulation signal generation and anti-turbulence optical communication device according to claim 1, characterized in that, The continuous laser output from the 1530nm laser (1) is transmitted to the electro-optic modulator (2) via optical fiber. The electro-optic modulator (2) modulates the laser amplitude or phase according to the external control signal applied by the signal generator (3) to generate a modulated laser signal that meets the communication requirements. The modulated laser signal is injected into the erbium-doped fiber amplifier (EDFA) (4) through optical fiber. After being amplified by the erbium-doped fiber amplifier (4), it enters the first polarization isolator (5) to ensure unidirectional signal transmission. The amplified modulated signal is transmitted by optical fiber to the 1530 / 1625nm wavelength division multiplexer (6). After passing through the highly nonlinear fiber (7), it generates 1625nm Stokes light. The 1625nm Stokes light is adjusted by the first polarization controller (8) to change the polarization state. Then, the optical signal is transmitted in the forward direction along the second polarization isolator (9) to suppress backscattered light and avoid interference with the pump source and mode lock. The 90% port of the output coupler (10) is connected to the dispersion compensation fiber (11) to achieve near-zero net dispersion control in the cavity. After dispersion compensation, the optical signal enters port a of the circulator (12), port b is connected to the semiconductor saturable absorber mirror SESAM (13), triggering the saturable absorption effect, the pulse edge is absorbed and the peak is retained, thus narrowing the pulse width, port c is connected to the 1530nm / 1625nm wavelength division multiplexer (6), forming a ring cavity Raman femtosecond laser structure, and outputs the 10% port of the output coupler (10); The femtosecond modulated optical pulse signal output from the 10% port of the output coupler (10) changes its polarization state through the second polarization controller (14) and enters the chirped pulse fiber amplifier (CPA) (15) for power amplification. The amplified signal is then input to the first collimator (16) for collimation via an optical fiber connection. The collimated femtosecond modulated optical pulse signal is incident on the first diffraction grating (17) for spectral expansion, so that light of different frequencies is emitted at different angles. After the grating is dispersed, the light is emitted in parallel through the first cylindrical lens (18) and focused on the multi-phase plane (19) located at the back focal plane. Multiple phase patterns are sequentially loaded on the multi-phase plane (19). After the optical signal passes through the first phase pattern on the multi-phase plane (19), it is reflected onto the plane mirror (20). The optical signal reflected by the plane mirror (20) is then incident on the second phase pattern on the multi-phase plane (19). After multiple modulation-reflection-modulation cycles, high-precision control of the spatial frequency domain phase of the femtosecond modulated spatiotemporal optical pulse signal is achieved. Finally, the femtosecond-modulated spatiotemporal optical pulse signal that has completed phase modulation is reflected by the multi-phase plane (19) to the second cylindrical lens (21), and the optical signal is emitted in parallel and focused onto the second diffraction grating (22). All optical signals with different spatial angles and different wavelengths are diffracted back to the same direction, realizing time Fourier transform and completing spatial frequency domain modulation. The output pulse optical signal that is bundled in the spatial domain and shaped in the time domain is incident on the spherical lens (23) to realize spatial Fourier transform. The spatiotemporal phase information encoded in the beam angular spectrum is converted into an intensity distribution pattern visible in space through diffraction and interference, thereby generating a femtosecond spatiotemporal optical pulse wave packet carrying the modulation signal at the back focal plane of the spherical lens (23). The femtosecond spatiotemporal optical pulse wave packet of the modulated signal is split into two beams by a cube beam splitter (24). One beam enters the CMOS of the beam analyzer (25) to collect light intensity distribution information; the other beam enters the collimating beam expander group (26) to form a femtosecond modulated spatiotemporal optical pulse wave packet for long-distance transmission. After passing through the atmospheric turbulence channel, the femtosecond modulated spatiotemporal optical pulse wave packet transmitted in space is coupled into the optical fiber by the receiving antenna (27). One beam enters the power meter (28) to collect power information, and the other beam enters the photodetector (29) and is connected to the field programmable gate array (FPGA) (30) to realize signal demodulation.

3. The spatiotemporal wave packet modulation signal generation and anti-turbulence optical communication device according to claim 1, characterized in that, The multi-phase plane (19) is formed by etching different phase patterns on a phase plane to achieve modulation and shaping of pulse beams.

4. The spatiotemporal wave packet modulation signal generation and anti-turbulence optical communication device according to claim 1, characterized in that, The collimating beam expander group (26) is a Galilean collimating beam expander system.

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