CN111092653B - Device for realizing dual-polarization Airy obstacle-detouring signal transmission based on single SLM space partition - Google Patents

Device for realizing dual-polarization Airy obstacle-detouring signal transmission based on single SLM space partition Download PDF

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CN111092653B
CN111092653B CN201911306274.2A CN201911306274A CN111092653B CN 111092653 B CN111092653 B CN 111092653B CN 201911306274 A CN201911306274 A CN 201911306274A CN 111092653 B CN111092653 B CN 111092653B
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airy
polarization
polarization state
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lens
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CN111092653A (en
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刘博�
吴泳锋
张丽佳
渠松松
赵立龙
孙婷婷
忻向军
毛雅亚
刘少鹏
宋真真
王俊锋
哈特
姜蕾
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Nanjing University of Information Science and Technology
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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
    • H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
    • G02B27/0927—Systems for changing the beam intensity distribution, e.g. Gaussian to top-hat
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
    • G02B27/0938—Using specific optical elements
    • G02B27/095—Refractive optical elements
    • G02B27/0955—Lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
    • G02B27/283—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising used for beam splitting or combining
    • 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

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  • Optics & Photonics (AREA)
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  • Optical Communication System (AREA)
  • Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)

Abstract

The invention relates to a device for realizing dual-polarization Airy obstacle-detouring signal transmission based on single SLM space partition, belonging to the field of communication. The waveform generator generates a signal to be loaded on the Mach-Zehnder modulator, the signal is transmitted in an optical carrier wave, the signal is divided into two beams of Gaussian light in polarization states perpendicular to each other through the polarization beam splitter, the Gaussian light enters a space channel after passing through the collimator, the Gaussian light is respectively incident on the upper half area and the lower half area of the SLM and reflected by the SLM, the transmission lens transmits an Airy light beam, and the two beams of Airy light beams in polarization states are coupled through the beam combiner and then are transmitted to the receiving end through the optical fiber. The invention only forms two Airy beams through one spatial light modulator to realize the barrier-bypassing transmission, and loads signals on the double-polarization-state Airy beams through the polarization multiplexing technology, thereby doubling the channel capacity and reducing the cost of the system and the signal transmission.

Description

Device for realizing dual-polarization Airy obstacle-detouring signal transmission based on single SLM space partition
Technical Field
The invention belongs to the field of communication, and relates to a device for realizing dual-polarization Airy obstacle-detouring signal transmission based on single SLM space partition.
Background
Diffraction is a fundamental property of light beams and can be used to explain all classical wave phenomena. Due to diffraction, the light spot becomes larger and the energy is dispersed gradually during the propagation of the light beam. Therefore, in the early days of the laser invention, there has been a search for eliminating or counteracting the diffraction effect. In a nonlinear medium, researchers achieve suppression of beam diffraction by adopting self-focusing nonlinearity of the medium, namely a forming mechanism of a space optical soliton. This method has been experimentally confirmed several years ago. However, the desire to realize a non-diffracted beam in free space has also made the non-diffracted beam an important topic in the research field in recent years. In 2007, researchers at the university of florida in middle have found that the airy function that is exponentially "trapped" is a solution to schrodinger's equation, based on which they have experimentally achieved the generation of an airy beam carrying limited energy for the first time.
Based on the summary of the research results of the current theory and experiment, the Airy beam has three novel characteristics, namely self-transverse acceleration, no diffraction and self-repairing. Self-transverse acceleration, which describes that the transmission track of the Airy beam is similar to the flight trajectory of a bullet under the action of gravity in the free space propagation process; diffraction-free, meaning that the profile of the light field intensity distribution remains approximately constant during propagation; self-repairing means that if a part of light intensity is shielded in the free space propagation process of the Airy light beam, the intensity distribution profile of the Airy light beam can be restored to the shape before being shielded after being transmitted for a certain distance. Airy beams should be one of the undiffracted beams, but the lateral acceleration characteristic found in undiffracted beams is its unique property. If such a laser beam is used to deliver energy in free space, its self-curving parabolic trajectory allows the light energy to impinge on the target behind certain obstacles. In addition, the self-repairing characteristic of the Airy light beam enables the Airy light beam to have a unique application prospect in the field of free space optical communication, because the Airy light beam can be self-repaired after being shielded in the transmission process, theoretical analysis on the mechanism of the Airy light beam shows that the anti-interference capability of the Airy light beam in the transmission process in a disturbance environment is stronger than that of a Gaussian light beam.
Spatial Light Modulators (SLMs) are a class of devices that can load information onto a one-or two-dimensional optical data field to effectively utilize the intrinsic speed, parallelism, and interconnection capabilities of light to enable modulation of the light intensity at points in a two-dimensional space. The spatial light modulator is expensive, and in a general airy beam system, one spatial light modulator only performs phase modulation on one gaussian beam, which results in high system cost and undesirable channel capacity.
Disclosure of Invention
The invention provides a device for realizing dual-polarization Airy obstacle-detouring signal transmission based on single SLM space partition, which is low in cost and high in channel capacity.
The technical scheme adopted by the invention is as follows:
the device for realizing dual-polarization Airy barrier signal transmission based on single SLM space partition comprises a sending end, a space channel and a receiving end, wherein the sending end sends Gaussian lights carrying waveform signals and in mutually orthogonal x polarization state and y polarization state to the space channel respectively;
the spatial channel comprises a first reflector, a second reflector, a spatial light modulator, a third reflector, a fourth reflector, a first lens, a second lens, a first beam splitter, a second beam splitter, a first quadruple focal length imaging system, a second quadruple focal length imaging system, a beam combiner, a third collimator and a computer, wherein the spatial light modulator is connected with the computer;
the x-polarization Gaussian light is reflected to the upper half area of the spatial light modulator through the first reflector, a cubic phase is loaded on the upper half area of the spatial light modulator to generate the x-polarization Gaussian light, the x-polarization Gaussian light is reflected to the third reflector, the reflected light of the third reflector transmits the first lens, and the x-polarization Airy light beam is generated at the focal plane position of the first lens through Fourier transformation of the first lens; the x-polarization state Airy light beam is emitted to the first beam splitter, the first beam splitter divides the x-polarization state Airy light beam into a first x-polarization state Airy light beam and a second x-polarization state Airy light beam, the first x-polarization state Airy light beam enters the beam combiner, the second x-polarization state Airy light beam enters the first quadruple focal length imaging system, and the first quadruple focal length imaging system is used for observing the transmission track of the x-polarization state Airy light beam;
the y-polarization Gaussian light is reflected to the lower half area of the spatial light modulator through the second reflector, the same cubic phase is loaded on the lower half area of the spatial light modulator to be generated and reflected to the fourth reflector, the reflected light of the fourth reflector transmits the second lens, and y-polarization Airy light beams are generated at the focal plane position of the second lens through Fourier transformation of the second lens; the y-polarization state Airy beam is emitted to the second beam splitter, the second beam splitter divides the y-polarization state Airy beam into a first y-polarization state Airy beam and a second y-polarization state Airy beam, the first y-polarization state Airy beam enters the beam combiner, the second y-polarization state Airy beam enters the second quadruple focal length imaging system, and the second quadruple focal length imaging system is used for observing the transmission track of the y-polarization state Airy beam;
the first x-polarization state Airy light beam and the first y-polarization state Airy light beam are coupled by the beam combiner, are modulated into parallel light by the third collimator, and are transmitted to the receiving end through an optical fiber; and the receiving end processes the received optical signal to obtain a waveform signal.
Further, the transmitting end comprises a waveform generator, a mach-zehnder modulator, a polarization beam splitter, a first collimator and a second collimator, a waveform signal generated by the waveform generator is modulated by the mach-zehnder modulator and then output as an optical signal, the optical signal is divided into mutually orthogonal gauss light in an x polarization state and a y polarization state by the polarization beam splitter, and the gauss light in the x polarization state is transmitted to the spatial channel after being straightened by the first collimator; and the Gaussian light in the y polarization state is transmitted to the spatial channel after being straightened by the second collimator.
Further, the receiving end comprises an erbium-doped fiber amplifier, a coherent receiver and a digital signal processor, wherein the erbium-doped fiber amplifier amplifies a received optical signal and transmits the amplified optical signal to the coherent receiver, and a local oscillation light source is arranged in the coherent receiver; the digital signal processing is coupled to the coherent receiver for signal processing.
Further, the cubic phase is: exp [ j alpha (x-x) ]0)3]Exp denotes an exponential function with a natural constant e as the base, j denotes a complex number, α is a cubic parameter, x is a one-dimensional Airy beam abscissa, and x is a complex number0Is a one-dimensional Airy beam abscissa variable.
Further, the focal lengths of the first lens and the second lens are both 20 cm.
Furthermore, the first quadruple focal length imaging system and the second quadruple focal length imaging system both comprise a CCD image sensor, a fifth reflector and two third lenses, the second x polarization state airy beam and the second y polarization state airy beam are respectively emitted onto the third lenses corresponding to the quadruple focal length imaging system, and the transmission light is reflected by the fifth reflector and is imaged on the CCD image sensor after transmitting through the other third lens.
The invention has the beneficial effects that:
according to the invention, barrier-bypassing transmission of the Airy beams in the dual-polarization state is realized by partitioning the spatial light modulator from top to bottom. The signal is loaded on the Mach-Zehnder modulator through the waveform generator, two beams of Gaussian light with horizontal polarization and vertical polarization (x polarization and y polarization) are formed through the polarization beam splitter, then the two beams of Gaussian light respectively enter an upper half area and a lower half area of the spatial light modulator, and after being reflected, the two beams of Gaussian light respectively pass through the lens, and an Airy light beam is formed at the focal point of the lens. The invention only forms two Airy beams through one spatial light modulator to realize the barrier-bypassing transmission, and loads signals on the Airy beams in the dual-polarization state through the polarization multiplexing technology (the communication is carried out by utilizing the information carried by the light in different polarization states), thereby doubling the channel capacity and reducing the cost of the system and the signal transmission.
Drawings
FIG. 1 is a schematic structural diagram of an apparatus for implementing dual-polarization Airy barrier signal transmission based on single SLM space division according to the present invention;
FIG. 2 is a schematic diagram of a spatial channel structure;
FIG. 3 is an enlarged view of the phase diaphragm of FIG. 2;
FIG. 4 is a two-dimensional Airy beam field profile;
reference numerals: 1-waveform generator, 2-mach-zehnder modulator (MZM), 3-polarization beam splitter, 4-first collimator, 5-second collimator, 6-first mirror, 7-second mirror, 8-Spatial Light Modulator (SLM), 9-third mirror, 10-fourth mirror, 11-first lens, 12-second lens, 13-first beam splitter, 14-second beam splitter, 15-first quadruple focal length imaging system, 16-second quadruple focal length imaging system, 17-beam combiner, 18-third collimator, 19-erbium-doped fiber amplifier, 20-coherent receiver, 21-Digital Signal Processing (DSP), 22-computer, 23-obstacle.
Detailed Description
The following describes in detail an apparatus for implementing dual-polarization airy barrier signal transmission based on single SLM spatial partition according to the present invention with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, the apparatus for implementing dual-polarization airy barrier signal transmission based on single SLM spatial partition includes a transmitting end, a spatial channel, and a receiving end, where the transmitting end transmits gaussian lights carrying waveform signals and in orthogonal x-polarization state and y-polarization state to the spatial channel, respectively.
The spatial channel comprises a first reflector 6, a second reflector 7, a spatial light modulator 8, a third reflector 9, a fourth reflector 10, a first lens 11, a second lens 12, a first beam splitter 13, a second beam splitter 14, a first quadruple focal length imaging system 15, a second quadruple focal length imaging system 16, a beam combiner 17, a third collimator 18 and a computer 22, wherein the spatial light modulator 8 is connected with the computer 22.
The x-polarization Gaussian light is reflected to the upper half area of the spatial light modulator 8 through the first reflecting mirror 6, a cubic phase is loaded on the upper half area of the spatial light modulator 8 to be generated and reflected to the third reflecting mirror 9, the reflected light of the third reflecting mirror 9 transmits the first lens 11, and the x-polarization Airy light beam is generated at the focal plane position of the first lens 11 through Fourier transformation of the first lens 11. The x-polarization state Airy light beam is emitted to the first beam splitter 13, the first beam splitter 13 divides the x-polarization state Airy light beam into a first x-polarization state Airy light beam and a second x-polarization state Airy light beam, the first x-polarization state Airy light beam enters the beam combiner 17, the second x-polarization state Airy light beam enters the first quadruple focal length imaging system 15, and the first quadruple focal length imaging system 15 is used for observing the transmission track of the x-polarization state Airy light beam.
The y-polarization Gaussian light is reflected to the lower half area of the spatial light modulator 8 through the second reflecting mirror 7, the same cubic phase is loaded on the lower half area of the spatial light modulator 8 to be generated and reflected to the fourth reflecting mirror 10, the reflected light of the fourth reflecting mirror 10 transmits the second lens 12, and the y-polarization Airy light beam is generated at the focal plane position of the second lens 12 through Fourier transformation of the second lens 12. The y polarization state airy beam is emitted to the second beam splitter 14, the second beam splitter 14 divides the y polarization state airy beam into a first y polarization state airy beam and a second y polarization state airy beam, the first y polarization state airy beam enters the beam combiner 17, the second y polarization state airy beam enters the second quadruple focal length imaging system 16, and the second quadruple focal length imaging system 16 is used for observing the transmission track of the y polarization state airy beam. The cubic phase is specifically: exp [ j alpha (x-x) ]0)3]Exp denotes an exponential function with a natural constant e as the base, j denotes a complex number, α is a cubic parameter, x is a one-dimensional Airy beam abscissa, and x is a complex number0Is a one-dimensional Airy beam abscissa variable.
The first x-polarization state airy beam and the first y-polarization state airy beam are coupled by the beam combiner 17, modulated into parallel light by the third collimator 18, and transmitted to the receiving end through the optical fiber. And the receiving end processes the received optical signal to obtain a waveform signal.
Specifically, the transmitting end comprises a waveform generator 1, a mach-zehnder modulator 2, a polarization beam splitter 3, a first collimator 4 and a second collimator 5, a waveform signal generated by the waveform generator 1 is modulated by the mach-zehnder modulator 2 and then output as an optical signal, the optical signal is divided into mutually orthogonal gauss light in an x polarization state and a y polarization state by the polarization beam splitter 3, and the gauss light in the x polarization state is transmitted to a spatial channel after being straightened by the first collimator 4. The y-polarization Gaussian light is transmitted to the spatial channel after being straightened by the second collimator 5.
The receiving end comprises an erbium-doped optical fiber amplifier 19, a coherent receiver 20 and a digital signal processing 21, the erbium-doped optical fiber amplifier 19 amplifies received optical signals and transmits the amplified optical signals to the coherent receiver 20, a local oscillator light source is arranged in the coherent receiver 20, the local oscillator light frequency is strictly matched with the signal light frequency, and the local oscillator light and the signal light are locked in phase. The digital signal processing 21 is connected to the coherent receiver 20 for signal processing.
The first quadruple focal length imaging system 15 and the second quadruple focal length imaging system 16 both include a CCD image sensor, a fifth mirror and two third lenses, the second x polarization state airy beam and the second y polarization state airy beam are respectively projected onto the third lenses corresponding to the quadruple focal length imaging system, and the transmission light is reflected by the fifth mirror and is imaged on the CCD image sensor after transmitting through the other third lens.
In the present embodiment, the focal lengths of the first lens 11 and the second lens 12 are both 20 cm.
In order to generate the airy beam, the phase mask (phase distribution pattern of the two-dimensional airy beam) loaded by the spatial light modulator 8 is shown in fig. 3, because the phase of the spatial light modulator 8 corresponds to a gray scale of 0-255, and thus the cubic phase has been folded in the range of 0-2 pi. In the displayed phase pattern, black corresponds to a phase of 0 and white corresponds to a phase of 2 pi. The size of the phase patch is 512 x 512 pixels, corresponding to the number of pixels of the spatial light modulator 8.
Fig. 4 shows a two-dimensional airy beam field distribution diagram when the propagation distance z of the airy beam obtained by MATLAB simulation is 0. By observing the field intensity distribution diagram, the barrier capability of the Airy light can be judged (the rightmost side of the graph 4 is gray scale which represents the brightness of the light spot).
The use method of the device comprises the following steps:
the spatial light modulator 8 is able to adjust the trajectory of the airy beam so that it carries more energy when it passes around an obstacle. Can adopt two kindsThe method is realized as follows: firstly, changing a cubic parameter alpha, so as to optimize the bending degree of the Airy beam; secondly, moving the phase template to adjust x0Thus, the emission angle of the Airy beam trajectory can be optimized. The phase template is loaded by the computer 22 and the cubic parameter a is also adjusted by the computer 22.
To test Airy beam obstruction, an obstruction 23 for blocking the signal beam is disposed at each focal plane of the first lens 11 and the second lens 12, and in this embodiment, the obstruction 23 is an opaque thin plate. The transmission tracks of the signal beams are respectively observed through the two CCDs, and the Airy beams can be adjusted by referring to the two methods in the process.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any alternative or alternative method that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the scope of the present invention.

Claims (5)

1. The device for realizing dual-polarization Airy barrier signal transmission based on single SLM space partition is characterized by comprising a sending end, a space channel and a receiving end, wherein the sending end sends Gaussian lights which carry waveform signals and are in an x polarization state and a y polarization state which are mutually orthogonal to each other into the space channel;
the spatial channel comprises a first reflector (6), a second reflector (7), a spatial light modulator (8), a third reflector (9), a fourth reflector (10), a first lens (11), a second lens (12), a first beam splitter (13), a second beam splitter (14), a first quadruple focal length imaging system (15), a second quadruple focal length imaging system (16), a beam combiner (17), a third collimator (18) and a computer (22), and the spatial light modulator (8) is connected with the computer (22);
the x-polarization Gaussian light is reflected to the upper half area of the spatial light modulator (8) through the first reflector (6), a cubic phase is loaded on the upper half area of the spatial light modulator (8) to be generated and reflected to the third reflector (9), the reflected light of the third reflector (9) transmits the first lens (11), and an x-polarization Airy light beam is generated at the focal plane position of the first lens (11) through Fourier transformation of the first lens (11); the X-polarization state Airy light beam is emitted to a first beam splitter (13), the X-polarization state Airy light beam is split into a first X-polarization state Airy light beam and a second X-polarization state Airy light beam by the first beam splitter (13), the first X-polarization state Airy light beam enters a beam combiner (17), the second X-polarization state Airy light beam enters a first quadruple focal length imaging system (15), and the first quadruple focal length imaging system (15) is used for observing the transmission track of the X-polarization state Airy light beam;
the Y-polarization Gaussian light is reflected to the lower half area of the spatial light modulator (8) through the second reflecting mirror (7), a same cubic phase is loaded on the lower half area of the spatial light modulator (8) to be generated and reflected to the fourth reflecting mirror (10), the reflected light of the fourth reflecting mirror (10) transmits through the second lens (12), and a Y-polarization Airy light beam is generated at the focal plane position of the second lens (12) through Fourier transformation of the second lens (12); the y polarization state Airy light beam is emitted to a second beam splitter (14), the second beam splitter (14) divides the y polarization state Airy light beam into a first y polarization state Airy light beam and a second y polarization state Airy light beam, the first y polarization state Airy light beam enters a beam combiner (17), the second y polarization state Airy light beam enters a second quadruple focal length imaging system (16), and the second quadruple focal length imaging system (16) is used for observing the transmission track of the y polarization state Airy light beam;
the first x polarization state Airy light beam and the first y polarization state Airy light beam are coupled through a beam combiner (17), then are modulated into parallel light through a third collimator (18), and are transmitted to the receiving end through an optical fiber; the receiving end processes the received optical signal to obtain a waveform signal;
the cubic phase is: exp [ j alpha (x-x) ]0)3]Exp denotes an exponential function with a natural constant e as the base, j denotes a complex number, α is a cubic parameter, x is a one-dimensional Airy beam abscissa, and x is a complex number0Is a one-dimensional Airy beam abscissa variable.
2. The device for realizing dual-polarization Airy barrier signal transmission based on single SLM space division according to claim 1, wherein the transmitting end includes a waveform generator (1), a Mach-Zehnder modulator (2), a polarization beam splitter (3), a first collimator (4) and a second collimator (5), the waveform signal generated by the waveform generator (1) is modulated by the Mach-Zehnder modulator (2) and then output as an optical signal, the optical signal is divided into Gaussian light in an x-polarization state and a y-polarization state orthogonal to each other by the polarization beam splitter (3), and the Gaussian light in the x-polarization state is straightened by the first collimator (4) and then transmitted to the spatial channel; and the Gaussian light in the y polarization state is transmitted to the spatial channel after being straightened by the second collimator (5).
3. The device for realizing dual-polarization Airy barrier signal transmission based on single SLM spatial partition according to claim 1, wherein the receiving end includes an erbium-doped fiber amplifier (19), a coherent receiver (20) and a digital signal processing (21), the erbium-doped fiber amplifier (19) amplifies the received optical signal and transmits the amplified optical signal to the coherent receiver (20), and a local oscillator light source is built in the coherent receiver (20); digital signal processing (21) is connected to the coherent receiver (20) for signal processing.
4. The device for achieving dual polarization airy barrier signal transmission based on single SLM spatial partition according to claim 1, characterized in that the focal length of the first lens (11) and the second lens (12) is 20 cm.
5. The device for realizing dual-polarization Airy barrier signal transmission based on single SLM space division according to claim 1, wherein the first quadruple focal length imaging system (15) and the second quadruple focal length imaging system (16) each include a CCD image sensor, a fifth mirror and two third lenses, the second x-polarization Airy beam and the second y-polarization Airy beam respectively irradiate the third lenses corresponding to the quadruple focal length imaging system, and the transmission light is reflected by the fifth mirror and transmitted by the other third lens to be imaged on the CCD image sensor.
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