CN110149150B - Column Vector Beam (CVB) based communication multiplexing system and method - Google Patents
Column Vector Beam (CVB) based communication multiplexing system and method Download PDFInfo
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- CN110149150B CN110149150B CN201910257730.2A CN201910257730A CN110149150B CN 110149150 B CN110149150 B CN 110149150B CN 201910257730 A CN201910257730 A CN 201910257730A CN 110149150 B CN110149150 B CN 110149150B
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Abstract
The present application relates to a Column Vector Beam (CVB) based communication multiplexing system, comprising: the device comprises a laser, an information coding module, a beam splitting module, a CVB generating module, a multiplexing module and a photonic crystal fiber transmission module; the laser is used for generating a laser beam; the information coding module is used for coding the laser beam to obtain a laser beam carrying information; the beam splitting module is used for splitting the laser beam carrying the information into a plurality of paths of light beams, and each path of light beam corresponds to one channel; the CVB generation module is used for respectively converting the multi-path light beams into column vector light beams of different orders; the multiplexing module is used for combining the multi-path column vector beams with different orders into a coaxial column vector beam; the photonic crystal fiber transmission module is used for focusing and coupling the coaxial column vector light beam into the photonic crystal fiber for transmission, and the system has the advantage of low transmission loss. In addition, a communication multiplexing method based on Column Vector Beam (CVB) is also provided.
Description
Technical Field
The invention relates to the technical field of optical communication, in particular to a communication multiplexing system and method based on Column Vector Beams (CVB).
Background
With the development of socio-economy, people have higher and higher requirements on the transmission rate of data. Under current technology conditions, the bandwidth resources of optical fibers are limited. In the long run, therefore, it is a great trend to find new communication multiplexing dimensions. And the Cylindrical Vector Beam (CVB) provides a brand new multiplexing dimension for the optical communication system, and the system capacity can be greatly improved on the premise of not widening the system bandwidth.
Research on optical communication of the CVB light beam currently focuses on transmission and communication of the CVB light beam in free space, but the transmission and communication in free space have a problem of large loss, resulting in a limited transmission distance.
Disclosure of Invention
In view of the above, it is desirable to provide a Column Vector Beam (CVB) based communication multiplexing system and method with low transmission loss.
A Column Vector Beam (CVB) -based communication multiplexing system, the system comprising: the device comprises a laser, an information coding module, a beam splitting module, a CVB generating module, a multiplexing module and a photonic crystal fiber transmission module; the laser is used for generating a laser beam; the information coding module is used for coding the laser beam to obtain a laser beam carrying information; the beam splitting module is used for splitting the laser beam carrying the information into a plurality of paths of light beams; the CVB generation module is used for respectively converting the multi-path light beams into column vector light beams of different orders; the multiplexing module is used for combining the multi-path column vector beams with different orders into a coaxial column vector beam; the photonic crystal fiber transmission module is used for focusing and coupling the coaxial column vector light beam into the photonic crystal fiber for transmission.
In one embodiment, the splitter module comprises: the first coupler, the first erbium-doped fiber amplifier, the second coupler and the third coupler; the first coupler is used for dividing a laser beam carrying information into two paths of light beams, wherein one path of light beam is subjected to light beam amplification through the first erbium-doped fiber amplifier and then is divided into two sub-paths of light beams through the second coupler; and the other light beam is subjected to light beam amplification through the second erbium-doped fiber amplifier and then is divided into two sub-light beams through the third coupler.
In one embodiment, the CVB generation module includes multiple channels, each channel containing a different vortex slide for converting the laser beam in the channel into a cylindrical vector beam, the different vortex slides corresponding to the different orders of the cylindrical vector beam.
In one embodiment, the multiplexing module comprises: a plurality of beam splitters; the beam splitter is used for combining the plurality of cylindrical vector beams with different orders into a coaxial cylindrical vector beam.
In one embodiment, the photonic crystal fiber transmission module includes: a first objective lens and a photonic crystal fiber; the first objective lens is used for focusing and coupling the received coaxial column vector light beam into the photonic crystal fiber; the photonic crystal fiber is used for transmitting coaxial cylindrical vector beams containing multi-order cylindrical vector beams.
In one embodiment, the system further comprises: an adjustment module, the adjustment module comprising: the polarization controller and the collimator correspond to each channel; the polarization controller is used for adjusting the polarization of the light beams in the corresponding channels; the collimator is used for converting the adjusted light beam into a parallel light beam.
In one embodiment, the system further comprises: a demultiplexing module comprising: a second objective and a vortex slide; the second objective is used for carrying out divergent transmission on the light beam output by the photonic crystal fiber to the vortex glass; the vortex glass sheet is used for demultiplexing the light beams containing the multi-order column vectors.
In one embodiment, the system further comprises: a verification module, the verification module comprising: a focusing lens and a CCD camera; the focusing lens is used for focusing the light beams after demultiplexing to the CCD camera; the CCD camera is used for monitoring the polarization state change of the output light beam.
In one embodiment, the verification module further comprises: a variable optical attenuator, a third erbium-doped fiber amplifier, a band-pass filter, a photoelectric detector and a programmable error detector; the variable optical attenuator is used for acquiring bit error rates under different light beam intensities by changing different light beam intensities; the third erbium-doped fiber amplifier is used for amplifying a light beam, and the band-pass filter is used for filtering noise; the photoelectric detector is used for converting the light beam into an electric signal and transmitting the electric signal to the programmable error detector; the programmable error detector is used to detect an error rate of information carried in the laser beam.
A Column Vector Beam (CVB) -based communication multiplexing method applied to a communication multiplexing system, the system comprising: the device comprises a laser, an information coding module, a beam splitting module, a CVB generating module, a multiplexing module and a photonic crystal fiber transmission module; the method comprises the following steps:
the laser sends the generated laser beam to the information coding module;
the information coding module codes the laser beam to obtain a laser beam carrying information, and sends the laser beam carrying information to the beam splitting module;
the beam splitting module splits the laser beam carrying information into a plurality of paths of light beams and transmits the light beams to the CVB generation module;
the CVB generation module respectively converts the multiple paths of light beams into column vector light beams of different orders and transmits the multiple paths of column vector light beams of different orders to the multiplexing module;
the multiplexing module synthesizes the multi-path column vector beams with different orders into a coaxial column vector beam and then transmits the coaxial column vector beam to the photonic crystal fiber transmission module;
and the photonic crystal fiber transmission module focuses and couples the coaxial column vector light beam into the photonic crystal fiber for transmission.
According to the communication multiplexing system and method based on the Column Vector Beam (CVB), the column vector beam containing multiple orders is focused and coupled into the photonic crystal fiber for transmission, the column vector beam has multiple multiplexing dimensions, so that the photonic crystal fiber has larger information capacity, the photonic crystal fiber has the advantages of high information capacity and low loss, the column vector beam can carry information to be transmitted in the photonic crystal fiber in a high-efficiency manner, and the loss is greatly reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a block diagram of a Column Vector Beam (CVB) based communication multiplexing system in one embodiment;
FIG. 2 is a schematic diagram of the electric field distribution of different CVBs in one embodiment;
FIG. 3 is a schematic diagram of the structure of a Photonic Crystal Fiber (PCF) in one embodiment;
FIG. 4 is a block diagram of a splitter module in one embodiment;
FIG. 5 is an experimental schematic of a Column Vector Beam (CVB) based communications multiplexing system in one embodiment;
FIG. 6 is a schematic diagram of an exemplary experimental apparatus for transmitting a CVB beam in a PCF;
FIG. 7 is a flow diagram of a method for Column Vector Beam (CVB) based communication multiplexing in one embodiment.
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 the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1, in one embodiment, a Column Vector Beam (CVB) based communication multiplexing system is proposed, the system comprising: the device comprises a laser 10, an information coding module 20, a beam splitting module 30, a CVB generating module 40, a multiplexing module 50 and a photonic crystal fiber transmission module 60;
a laser 10 for generating a laser beam; the information encoding module 20 is configured to encode the laser beam to obtain a laser beam carrying information; the beam splitting module 30 is configured to split a laser beam carrying information into multiple beams; the CVB generation module 40 is configured to convert the multiple light beams into column vector light beams of different orders, respectively; the multiplexing module 50 is used for combining the plurality of column vector beams with different orders into a coaxial column vector beam; the photonic crystal fiber transmission module 60 is used for focusing and coupling the coaxial cylindrical vector beams into the photonic crystal fiber for transmission.
The laser 10 is a light source that generates a laser beam. The information coding module is used for coding the information of the laser beam to enable the laser beam to carry the information, the information coding module comprises a beam source, the beam source can be from a programmable graphic generator (PPG), and the information coding is carried out on the laser beam through the PPG to obtain the laser beam carrying the information.
The beam splitting module 30 is used for splitting the laser beam into multiple parts to form multiple beams. In an embodiment, the beam splitting module 30 includes an N-splitting fiber coupler for splitting the information-carrying laser beam into N parts, and may further include: and the erbium-doped fiber amplifier is used for amplifying each light beam.
The CVB generation module 40 includes channels for converting the multiple beams, each channel including a different vortex slide, so that the multiple beams are converted into different orders of cylinder vector beams, respectively. For example, a 1-order CVB beam is generated for a 1-order vortex slide (VWP1), a 2-order CVB beam is generated through a 2-order vortex slide (VWP2), and an arbitrary-order CVB beam can be generated by a combination of a half-slide HWP and a vortex slide. For example, the generation of a 3-order CVB beam may be achieved by a combination of VWP1-HWP-VWP2, and the generation of a 3-order CVB beam may be achieved by a combination of HWP-VWP1-HWP-VWP 2-HWP.
The CVB beam is an orthogonal cylindrical vector mode based on polarization singularities, and CVB beams of different orders are orthogonal to each other, and CVB beams of the same order also have two orthogonal polarization states, such as a radial polarized light and an angular polarized light, which are 1 st order CVB beams. As shown in fig. 2, an electric field distribution from ± 1 to ± 4 of an eigenmode electric field of CVB capable of being transported in a Photonic Crystal Fiber (PCF) is shown. The arrows indicate the direction of the electric field or the local polarization characteristics of the CVB, the order in which the CVB can be extracted by rotating the polarization direction in azimuth. In one embodiment, the CVB generation module may derive a CVB beam of order + -1, + -2, + -3, + -4.
The multiplexing module 50 is configured to combine multiple cylindrical vector beams of different orders into one path, and combine the multiple paths of beams into the same path by using multiple beam splitters, that is, combine the multiple paths of beams into a coaxial cylindrical vector beam.
The photonic crystal fiber transmission module 60 is configured to focus and couple the coaxial column vector beam containing the multi-order CVB beam into the photonic crystal fiber, so that the photonic crystal fiber can transmit the multi-order CVB beam. In one embodiment, the photonic crystal fiber is composed of a pore microstructure and a photonic band gap obtained by periodically arranging the pore microstructure, and the outer layer is surrounded by the photonic crystal.
As shown in fig. 3, which is a schematic structural diagram of an embodiment of a Photonic Crystal Fiber (PCF), the photonic crystal fiber is a 19-cell air-core photonic crystal fiber, the diameter of a hollow core is 21.87 μm, the diameter of a microstructure of a cladding of air holes is 3.84 μm, the photonic crystal fiber belongs to a photonic band gap type photonic crystal fiber, the cladding of the fiber is formed by periodically arranging air holes according to a structure similar to a honeycomb, and a small air hole is added at the center of a honeycomb unit at the core position, so that a defect is introduced to form a core region. Since light is transmitted in air, its speed is 30% faster than in solid core fiber, and a larger information capacity transmission is achieved by multiplexed coaxial CVB.
As shown in fig. 4, in one embodiment, the splitter module includes: a first coupler 302, a first erbium-doped fiber amplifier 304, a second erbium-doped fiber amplifier 306, a second coupler 308, and a third coupler 310; the first coupler 302 is configured to divide a laser beam carrying information into two beams, where one beam is subjected to beam amplification by the first erbium-doped fiber amplifier 304, and then is divided into two sub-beams by the second coupler 308; the other beam is subjected to beam amplification by the second erbium-doped fiber amplifier 306 and then split into two sub-beams by the third coupler 310.
First, the laser beam is divided into two paths by the first coupler 302, then each path is amplified by an erbium-doped fiber amplifier, and then each path is divided into two paths again to form 4 paths of beams in total, and for descriptive distinction, the two paths of beams divided later are called as "sub-paths of beams". The light beams are divided into 4 paths, so that the subsequent CVB light beams are respectively converted aiming at each path, and the multi-order CVB light beams are obtained.
In one embodiment, the CVB generation module includes multiple channels, each channel containing a different vortex slide for converting the laser beam in the channel into a cylindrical vector beam, the different vortex slides corresponding to the different orders of the cylindrical vector beam.
Different vortex glass plates are used for generating cylindrical vector beams of different orders, and different cylindrical vector beams have different polarization directions and have more capacity. In order to make the resulting multiple cylindrical vector beams uncorrelated, each path is arranged to transmit a single mode light ray of a different length to the vortex slide. In one embodiment, the light beam is divided into 4 paths, and then transmitted through single mode optical fibers with different lengths, and then converted into parallel laser beams by a collimator and transmitted to a vortex glass to perform CVB beam conversion, for example, the converted 4 paths of CVB beams are CVBs of +3, -3, +2, and-2 orders, respectively.
In one embodiment, the multiplexing module comprises: a plurality of beam splitters; the beam splitter is used for combining the plurality of cylindrical vector beams with different orders into a coaxial cylindrical vector beam.
After obtaining the plurality of paths of cylindrical vector beams with different orders, the plurality of paths of beams can be collected to the same path through reflection or transmission by the plurality of beam splitters, and then the coaxial vector beams are obtained.
In one embodiment, the photonic crystal fiber transmission module includes: a first objective lens and a photonic crystal fiber; the first objective lens is used for focusing and coupling the received coaxial column vector light beam into the photonic crystal fiber; the photonic crystal fiber is used for transmitting coaxial cylindrical vector beams containing multi-order cylindrical vector beams.
The photonic crystal fiber transmission module comprises a first objective lens and a photonic crystal fiber, wherein the first objective lens is used for focusing and coupling light beams into the photonic crystal fiber, so that the coaxial column vector light beams of the multi-order column vector light beams can be transmitted through the photonic crystal fiber.
In one embodiment, the Column Vector Beam (CVB) -based communication multiplexing system further includes: an adjustment module, the adjustment module comprising: the polarization controller and the collimator correspond to each channel; the polarization controller is used for adjusting the polarization of the light beams in the corresponding channels; the collimator is used for converting the adjusted light beam into a parallel light beam.
Wherein, before transmitting to the CVB generation module, the light beam of each channel is first adjusted by the polarization controller to adjust the polarization of the light beam, so as to ensure that all the channels subsequently generate orthogonal polarized CVB states in free space. After the adjustment, the light beam is collimated by the collimator to obtain a parallel light beam, and the parallel light beam is conveniently irradiated to the vortex glass slide to generate a CVB light beam.
In one embodiment, the Column Vector Beam (CVB) -based communication multiplexing system further includes: a demultiplexing module comprising: a second objective and a vortex slide; the second objective is used for carrying out divergent transmission on the light beam output by the photonic crystal fiber to the vortex glass; the vortex glass sheet is used for demultiplexing the light beams containing the multi-order column vectors.
The method comprises the steps that after photonic crystal fiber transmission is used, demultiplexing is carried out at a receiving end, the demultiplexing is realized through an objective lens and a vortex slide, the effect of a second objective lens is opposite to that of a first objective lens in front, the first objective lens in front is used for focusing, the second objective lens in front is used for diverging CVB light beams, and then the CVB light beams irradiate the vortex slide for demultiplexing, namely the original multi-stage CVB separation is carried out. The different order vortex plates are used to separate the different order CVB beams, for example, if there are 2 and 3 orders, wherein 2 and 3 orders need to be separated by two vortex plates, and further, the same order CVB beam is separated by a Polarizing Beam Splitter (PBS).
In one embodiment, the Column Vector Beam (CVB) -based communication multiplexing system further includes: a verification module, the verification module comprising: a focusing lens and a CCD camera; the focusing lens is used for focusing the light beams after demultiplexing to the CCD camera; the CCD camera is used for monitoring the polarization state change of the output light beam.
Wherein, after demultiplexing the CVB light beam by the vortex slide, the demultiplexed light beam is focused to the CCD camera using a focusing lens so that a polarization state change of the output light beam is detected by the CCD camera.
In one embodiment, the verification module further comprises: a variable optical attenuator, a third erbium-doped fiber amplifier, a band-pass filter, a photoelectric detector and a programmable error detector; the variable optical attenuator is used for acquiring bit error rates under different light beam intensities by changing different light beam intensities; the third erbium-doped fiber amplifier is used for amplifying a light beam, and the band-pass filter is used for filtering noise; the photoelectric detector is used for converting the light beam into an electric signal and transmitting the electric signal to the programmable error detector; the programmable error detector is used to detect an error rate of information carried in the laser beam.
In order to verify the result of the CVB beam transmitted by the photonic crystal fiber, the optical attenuator is used for detecting the bit error rates of different beam intensities by changing the different beam intensities. In order to better verify the light beam, a third erbium-doped fiber amplifier is adopted to amplify the signal, then a band-pass filter is adopted to remove noise, then the filtered light beam is subjected to photoelectric conversion through a photoelectric detector to obtain an electric signal, then the electric signal is transmitted to a programmable error detector, and the error rate of information carried in the laser beam is detected by the programmable error detector.
Fig. 5 is an experimental diagram of a Column Vector Beam (CVB) -based communication multiplexing system in one embodiment. First, a laser (for example, with a wavelength of 1550nm) is generated by a laser, and then enters a MZM (modulator), information encoding is performed on the laser beam by combining a programmable pattern generator PPG and a linear amplifier (Bias), then the encoded laser beam is transmitted to a 2-branch coupler (1 x2 in the figure) through a SMF (single mode fiber), the laser beam carrying the information is divided into two branches, then two channels are respectively amplified by EDFA (erbium-doped fiber amplifier), then the two branches are respectively divided into two branches again by a 2-branch coupler to obtain 4 branches, and then the 4 branches are transmitted by single mode fibers with different lengths (0 m, 10m, 20m and 40m respectively) to ensure that signals of the four channels are uncorrelated. The four channels are finally collimated by a Collimator (COL) and output to different vortex slides (VWP is a vortex slide, which is divided into VWP1 and VWP2, HWP is a half-slide, and the combination of the two can generate different CVB beams), so as to generate four different CVB beams (CVB of order ± 2 and ± 3), and moreover, the polarization of the beams is respectively adjusted by a polarization controller FC before the collimator COL. After the four channels adopt the vortex glass to generate CVB light beams, the four branches are combined into coaxial light beams by adopting three Beam Splitters (BS), and then the coaxial light beams are coupled into a photonic crystal fiber PCF (air-core PCF in the figure), so as to carry out transmission. For output verification, the beam output from the PCF is collected by another objective lens, which is operative to diverge the Coaxial CVB beam (Coaxial CVBs is a schematic view of the Coaxial CVB beam after passing through the objective lens), and then demultiplexed by the same vortex slide (VWP), which requires one vortex slide for each step, two vortex slides for ± 2 and ± 3 steps (only schematic view in the figure), and further separation by a polarizing beam splitter PBS (not shown in the figure) for the same step. The light beam is then focused by a focusing Lens (Lens) onto the CCD, and an image observation of the polarization state is made by the CCD. Furthermore, the optical beam can also be transmitted to an optical power meter connected to a single-mode fiber to measure the bit error rate BER, not shown in the figure. In addition, the light beams after being demultiplexed can be transmitted to a Variable Optical Attenuator (VOA) for observing the BER change under different light beam intensities, and the light beams can be enlarged by an EDFA (erbium-doped fiber amplifier), then basic noise is filtered by a band-pass filter (BPF), and then the basic noise is converted into an electric signal by a Photodetector (PD) for a Programmable Error Detector (PED).
The insertion losses of the + -2 and + -3 step CVBs were found experimentally to be 8.27dB, 8.19dB, 9.91 dB, and 9.88dB, respectively. The propagation loss of CVB of +/-2 and +/-3 orders in the hollow PCF is respectively detected to be 0.72dB/m and 0.59dB/m by using a cut-off method. Insertion loss for + -1, + -4 order CVB was measured at 7.15dB, 7.36 dB, 12.14dB, 12.52 dB. Insertion loss includes coupling loss and propagation loss.
Fig. 6 is a schematic diagram of an experimental apparatus for transmitting a CVB beam in a PCF according to an embodiment. A laser beam with a wavelength of 1550nm is collimated by a Collimator (COL) through a Single Mode Fiber (SMF) and then a CVB beam is generated by a vortex slide (VWP), different VWP slides can be used to generate different CVB beams (which can be custom set in the experiment). Then coupled into a PCF (photonic crystal fiber) for transmission through an objective lens (OBJ), and in order to align the laser beam with the PCF, a five-dimensional translation stage is adopted as an auxiliary to move the relative position of the two so as to align the two. After transmission in the PCF, the output is collected by another objective lens (OBJ) for subsequent verification. In one embodiment, a beam splitter may be used to split the output beam into two beams for pattern detection and power detection, respectively. In the figure, the optical fiber twist and bending induced birefringence are adjusted by a polarization controller (FC), an objective OBJ demultiplexes a collected light beam and transmits the light beam to a VWP (vortex glass) so that a CVB light beam is converted into a gaussian-shaped light spot, then the light spot is filtered by a Polarizer, then the light spot is focused to a CCD through a focusing Lens, then the polarization state change of the output CVB light beam is detected by a near-infrared CCD, and in addition, the demultiplexed light beam can be coupled to a single-mode optical fiber and transmitted to an optical power meter for power detection. It was verified by experimental setup as in fig. 6 that the CVB beam could be transmitted in the PCF.
As shown in fig. 7, in one embodiment, a Column Vector Beam (CVB) -based communication multiplexing method is provided, applied to a communication multiplexing system, the system including: the device comprises a laser, an information coding module, a beam splitting module, a CVB generating module, a multiplexing module and a photonic crystal fiber transmission module; the method comprises the following steps:
in step 702, the laser transmits the generated laser beam to the information encoding module.
And 704, the information coding module codes the laser beam to obtain a laser beam carrying information, and sends the laser beam carrying information to the beam splitting module.
In step 708, the CVB generation module converts the multiple beams into different orders of cylindrical vector beams, and transmits the multiple different orders of cylindrical vector beams to the multiplexing module.
And 710, synthesizing the plurality of cylindrical vector beams with different orders into coaxial cylindrical vector beams by the multiplexing module, and then transmitting the coaxial cylindrical vector beams to the photonic crystal fiber transmission module.
And 712, the photonic crystal fiber transmission module focuses and couples the coaxial column vector beam into the photonic crystal fiber for transmission.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (8)
1. A Column Vector Beam (CVB) -based communication multiplexing system, the system comprising: the device comprises a laser, an information coding module, a beam splitting module, a CVB generating module, a multiplexing module and a photonic crystal fiber transmission module;
the laser is used for generating a laser beam;
the information coding module is used for coding the laser beam to obtain a laser beam carrying information;
the beam splitting module is used for splitting the laser beam carrying the information into a plurality of paths of light beams, and each path of light beam corresponds to one channel;
the CVB generation module is used for respectively converting the multi-path light beams into column vector light beams of different orders;
the multiplexing module is used for combining the multi-path column vector beams with different orders into a coaxial column vector beam;
the photonic crystal fiber transmission module is used for focusing and coupling the coaxial column vector light beam into the photonic crystal fiber for transmission;
the CVB generation module comprises a plurality of channels, wherein each channel comprises different vortex slides, the vortex slides are used for converting laser beams in the channels into cylindrical vector beams, and the different vortex slides are correspondingly converted into cylindrical vector beams of different orders;
the photonic crystal fiber transmission module comprises
A first objective lens and a photonic crystal fiber;
the first objective lens is used for focusing and coupling the received coaxial column vector light beam into the photonic crystal fiber;
the photonic crystal fiber is used for transmitting coaxial column vector beams containing multi-order column vector beams, the photonic crystal fiber comprises a photonic band gap type photonic crystal fiber, a fiber cladding is formed by periodically arranging air holes according to a structure similar to a honeycomb, and a small air hole is added at the center of a honeycomb unit at the core position.
2. The system of claim 1, wherein the splitter module comprises: the first coupler, the first erbium-doped fiber amplifier, the second coupler and the third coupler;
the first coupler is used for dividing a laser beam carrying information into two paths of light beams, wherein one path of light beam is subjected to light beam amplification through the first erbium-doped fiber amplifier and then is divided into two sub-paths of light beams through the second coupler;
and the other light beam is subjected to light beam amplification through the second erbium-doped fiber amplifier and then is divided into two sub-light beams through the third coupler.
3. The system of claim 1, wherein the multiplexing module comprises: a plurality of beam splitters; the beam splitter is used for combining the plurality of cylindrical vector beams with different orders into a coaxial cylindrical vector beam.
4. The system of claim 1, further comprising: an adjustment module, the adjustment module comprising: the polarization controller and the collimator correspond to each channel;
the polarization controller is used for adjusting the polarization of the light beams in the corresponding channels;
the collimator is used for converting the adjusted light beam into a parallel light beam.
5. The system of claim 1, further comprising: a demultiplexing module comprising: a second objective and a vortex slide;
the second objective is used for carrying out divergent transmission on the light beam output by the photonic crystal fiber to the vortex glass;
the vortex glass sheet is used for demultiplexing the light beams containing the multi-order column vectors.
6. The system of claim 5, further comprising: a verification module, the verification module comprising: a focusing lens and a CCD camera;
the focusing lens is used for focusing the light beams after demultiplexing to the CCD camera;
the CCD camera is used for monitoring the polarization state change of the output light beam.
7. The system of claim 6, wherein the verification module further comprises: a variable optical attenuator, a third erbium-doped fiber amplifier, a band-pass filter, a photoelectric detector and a programmable error detector;
the variable optical attenuator is used for acquiring bit error rates under different light beam intensities by changing different light beam intensities;
the third erbium-doped fiber amplifier is used for amplifying a light beam, and the band-pass filter is used for filtering noise;
the photoelectric detector is used for converting the light beam into an electric signal and transmitting the electric signal to the programmable error detector;
the programmable error detector is used to detect an error rate of information carried in the laser beam.
8. A Column Vector Beam (CVB) -based communication multiplexing method applied to the Column Vector Beam (CVB) -based communication multiplexing system of any one of claims 1 to 7, the method comprising:
the laser sends the generated laser beam to the information coding module;
the information coding module codes the laser beam to obtain a laser beam carrying information, and sends the laser beam carrying information to the beam splitting module;
the beam splitting module splits the laser beam carrying information into a plurality of paths of light beams and transmits the light beams to the CVB generation module;
the CVB generation module respectively converts the multiple paths of light beams into column vector light beams of different orders and transmits the multiple paths of column vector light beams of different orders to the multiplexing module;
the multiplexing module synthesizes the multi-path column vector beams with different orders into a coaxial column vector beam and then transmits the coaxial column vector beam to the photonic crystal fiber transmission module;
and the photonic crystal fiber transmission module focuses and couples the coaxial column vector light beam into the photonic crystal fiber for transmission.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017219118A1 (en) * | 2016-06-23 | 2017-12-28 | Ung Bora | Photonic crystal fiber methods and devices |
| CN108900275A (en) * | 2018-06-29 | 2018-11-27 | 深圳市深光谷科技有限公司 | Space division multiplexing communication system and the method and system for demultiplexing CVB channel |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2017219118A1 (en) * | 2016-06-23 | 2017-12-28 | Ung Bora | Photonic crystal fiber methods and devices |
| CN108900275A (en) * | 2018-06-29 | 2018-11-27 | 深圳市深光谷科技有限公司 | Space division multiplexing communication system and the method and system for demultiplexing CVB channel |
Non-Patent Citations (1)
| Title |
|---|
| 奇点光束在光纤通信中的基础与应用研究;乔文;《中国优秀硕士学位论文全文数据库》;20170715;1-69 * |
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