CN218958922U - Signal transmitting device - Google Patents
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- CN218958922U CN218958922U CN202223537188.2U CN202223537188U CN218958922U CN 218958922 U CN218958922 U CN 218958922U CN 202223537188 U CN202223537188 U CN 202223537188U CN 218958922 U CN218958922 U CN 218958922U
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Abstract
The application belongs to the technical field of space optical communication, and particularly discloses a signal transmitting device which aims at solving the problems of small information capacity and low safety of the traditional space optical communication technology. The signal transmitting device comprises a chaotic laser generating module, a beam splitting module, a signal source loading module and a column vector light beam generating module, wherein the chaotic laser generating module is used for generating chaotic laser, the beam splitting module is used for dividing the chaotic laser into multiple paths of light beams, the signal source loading module is used for loading the signal source for each path of light beam to obtain multiple paths of chaotic signal light beams carrying the signal source, and the column vector light beam generating module is used for respectively converting each path of chaotic signal light beams into different column vector light beams. The signal transmitting device combines the column vector optical multiplexing technology with the chaotic laser, so that the free space optical communication system can be subjected to double encryption, and the capacity of optical communication can be improved.
Description
Technical Field
The application relates to the technical field of space optical communication, in particular to a signal transmitting device.
Background
In recent years, the rapid development of the semiconductor industry and information technology has promoted the rise of the internet industry, and at the same time, there is also a higher demand for the transmission capacity and security of communication systems. In terms of transmission capacity, the spatial laser communication technology uses laser light as a carrier wave to transmit information, and generally uses physical parameters such as wavelength, frequency, time, amplitude, phase, and polarization of an optical signal to carry out signal mounting. Conventional information carriers are already in a fully developed state for later mass-communication. In order to expand the information capacity in free space communications, laser polarization multiplexing devices are used, and conventional laser polarization multiplexing devices generally adopt orthogonal linearly polarized light as a carrier of information, so as to transmit signals. At this point there will be two signals in the channel. The upper capacity limit of such systems is also limited to this in order to avoid cross-talk between signals. In terms of security, there are two methods of stealing an optical signal, the first is a method of direct measurement in a channel range, and the second is a method of acquisition by measuring the intensity of scattered light outside the channel range, for which reason a spatial optical signal can be intercepted, so that encryption of information is necessary.
Disclosure of Invention
The embodiment of the application provides a signal transmitting device, which aims to solve the technical problems of small information capacity and low safety of the space optical communication technology in the prior art.
The signal transmitting device provided by the embodiment of the application comprises a chaotic laser generating module, a beam splitting module, a signal source loading module and a column vector beam generating module,
the chaotic laser generating module is used for generating chaotic laser,
the beam splitting module is used for splitting the chaotic laser into multiple paths of light beams,
the signal source loading module is used for loading the signal source for each path of light beam to obtain a plurality of paths of chaotic signal light beams carrying the signal source,
the column vector light beam generating module is used for respectively converting each path of chaotic signal light beam into different column vector light beams.
According to the embodiment of the application, the column vector light beam generating module comprises a polaroid and a vortex wave plate, wherein the polaroid and the vortex wave plate are arranged along the propagation direction of each path of chaotic signal light beam, and different combinations of the polarization directions of the polaroids of different paths of chaotic signal light beams, the order of the vortex wave plate and the 0-degree fast axis direction correspond to different column vector light beams.
According to any one of the embodiments of the present application, the number of the chaotic signal light beams is an even number, and the two chaotic signal light beams are a group;
the polarization directions of the polarizers corresponding to different paths of chaotic signal light beams in the same group are mutually perpendicular, vortex wave plates are shared among different paths of chaotic signal light beams in the same group, and the fast axis direction of the vortex wave plates is the same as or perpendicular to the polarization direction of the polarizer corresponding to one path of chaotic signal light beam.
According to any one of the embodiments of the present application, the plurality of chaotic signal beams carrying the signal source at least includes a first chaotic signal beam and a second chaotic signal beam, and the first chaotic signal beam and the second chaotic signal beam share a vortex wave plate with an order of 1;
the polarizing plates corresponding to the first path of chaotic signal light beams and the polarizing plates corresponding to the second path of chaotic signal light beams are perpendicular to each other in polarization direction;
the 0-degree fast axis direction of the vortex wave plate with the order of 1 is perpendicular to the polarization direction of the polarizer corresponding to the first path of chaotic signal light beam.
According to any one of the embodiments of the present application, the plurality of chaotic signal beams carrying the signal source further includes a third chaotic signal beam and a fourth chaotic signal beam, and the third chaotic signal beam and the fourth chaotic signal beam share a vortex wave plate with an order of 2;
the polarizing plates corresponding to the third path of chaotic signal light beams and the polarizing plates corresponding to the fourth path of chaotic signal light beams are perpendicular to each other in polarization direction;
the 0-degree fast axis direction of the vortex wave plate with the order of 2 is perpendicular to the polarization direction of the polarizer corresponding to the third path of chaotic signal light beam.
According to any of the foregoing embodiments of the present application, the chaotic laser generating module includes a laser, a polarization controller, a fiber coupler, a tunable optical attenuator, a fiber mirror and a fiber isolator,
the laser output by the laser sequentially passes through the polarization controller, the optical fiber coupler and the adjustable optical attenuator, then enters the optical fiber reflector to generate reflected light, and the reflected light is fed back to the laser through the adjustable optical attenuator, the optical fiber coupler and the polarization controller to cause disturbance to the laser, so that chaotic laser is generated and output to the beam splitting module through the optical fiber isolator.
According to any of the foregoing embodiments of the present application, the beam splitting module includes a fiber optic beam splitter, where the fiber optic beam splitter is configured to split the chaotic laser into multiple beams.
According to any of the foregoing embodiments of the present application, the source loading module includes an electro-optical intensity modulator disposed along the propagation of each beam for receiving the beam and loading the source.
According to any of the foregoing embodiments of the present application, the chaotic laser generating module and the beam splitting module, the beam splitting module and each optoelectronic intensity modulator are connected by optical fibers,
the signal transmitting device also comprises a space optical switching module, wherein the space optical switching module comprises optical fiber collimators arranged along the propagation direction of each chaotic signal light beam, each photoelectric intensity modulator is connected with the corresponding optical fiber collimator through optical fibers, and each optical fiber collimator is used for converting an optical fiber transmission optical signal into a space transmission mode.
According to any one of the embodiments, the first path of chaotic signal light beam and the second path of chaotic signal light beam are transmitted to the vortex wave plate with the order of 1 through the first reflector after passing through the corresponding polaroids; and/or
The third path of chaotic signal light beam and the fourth path of chaotic signal light beam are transmitted to the vortex wave plate with the order of 2 through the second reflector after passing through the corresponding polaroid.
According to any one of the embodiments described above, the light incident side or the light emergent side of the polarizer corresponding to the first path of chaotic signal light beam is provided with a first total reflection mirror; and/or
The second total reflection mirror is arranged on the light incident side or the light emergent side of the polaroid corresponding to the third path of chaotic signal light beam.
According to any of the embodiments of the present application, the exit end of the vortex wave plate with the order of 1 is provided with a beam expander.
According to any of the foregoing embodiments of the present application, the signal transmitting device further includes a spatial beam combiner, the spatial beam combiner is configured to converge each column vector beam to form a single chaotic signal beam, and a beam expander is disposed at an exit end of the spatial beam combiner.
The signal transmitting device combines the column vector optical multiplexing technology with the chaotic laser, so that the free space optical communication system can be subjected to double encryption, and the capacity of optical communication can be improved.
Drawings
Fig. 1 is a schematic structural diagram of a signal transmitting device according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a signal transmitting device according to another embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of a signal transmitting device according to another embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of a signal transmitting device according to another embodiment of the present disclosure;
fig. 5 is a schematic structural diagram of a signal transmitting device according to another embodiment of the present application;
FIG. 6 is a schematic diagram of the generation of a vector light field with different columns;
FIG. 7a is a time domain waveform of a chaotic laser;
fig. 7b is a time domain waveform diagram of the chaotic signal after different information is carried in different vector light fields.
Detailed Description
Features and exemplary embodiments of various aspects of the present application are described in detail below to make the objects, technical solutions and advantages of the present application more apparent, and to further describe the present application in conjunction with the accompanying drawings and the detailed embodiments. It should be understood that the specific embodiments described herein are intended to be illustrative of the application and are not intended to be limiting. It will be apparent to one skilled in the art that the present application may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present application by showing examples of the present application.
Referring to fig. 1, a signal transmitting device 100 disclosed in an embodiment of the present application is applied to free space optical communication, and includes a chaotic laser generating module 1 for generating chaotic laser, and further includes a beam splitting module 2, a source loading module 3, and a column vector beam generating module 4 sequentially arranged along a laser propagation direction. The beam splitting module 2 is used for splitting the chaotic laser generated by the chaotic laser generating module 1 into multiple paths of light beams; the signal source loading module 3 is used for loading a signal source S for each path of light beam to obtain a plurality of paths of chaotic signal light beams carrying the signal source S; the column vector beam generating module 4 is configured to convert each path of chaotic signal beam into a different column vector beam.
As shown in fig. 7a (fig. 7a is a time domain waveform of a chaotic laser), which is a signal having a time domain waveform and a frequency spectrum very similar to those of a noise signal, and is typically characterized by initial value sensitivity and long-term unpredictability; according to the embodiment of the application, the information source is loaded to the physical layer encryption means of the chaotic laser, so that the safety of information transmission is improved, and the safety mainly depends on hardware parameters of devices, so that the encryption method has confidentiality better than that of a traditional algorithm encryption method; in the embodiment of the present application, as shown in fig. 6, different column vector light fields are generated by the column vector light beam generating module 4, and a plurality of communication channels are formed by multiplexing different column vector light fields, so as to implement capacity amplification. As shown in fig. 7b (fig. 7b is a time domain waveform diagram of a chaotic signal after different information is carried in different vector light fields, where the embodiment combines a column vector light multiplexing technology with chaotic laser, so that not only can dual encryption be performed on a free space optical communication system, but also the capacity of optical communication can be improved.
In addition, the information demodulation of the vector optical communication needs to completely receive the optical field, and both oblique and incomplete receiving can cause interference on the polarization state distribution of the optical field, thereby influencing the final information demodulation. The security of the free-space optical communication system can be further enhanced on the physical layer as well.
Referring to fig. 2, in some embodiments, the chaotic laser generating module 1 includes a laser 11, a polarization controller 12, an optical fiber coupler 13, a tunable optical attenuator 14, an optical fiber mirror 15 and an optical fiber isolator 16, where laser light output by the laser 11 sequentially passes through the polarization controller 12, the optical fiber coupler 13 and the tunable optical attenuator 14, and then enters the optical fiber mirror 15 to generate reflected light, and the reflected light is fed back to the laser 11 through the tunable optical attenuator 14, the optical fiber coupler 13 and the polarization controller 12 to cause disturbance to the laser 11, so as to generate chaotic laser light, and the chaotic laser light is output to the beam splitting module 2 through the polarization controller 12, the optical fiber coupler 13 and the optical fiber isolator 16.
Preferably, the laser 11 is a distributed feedback laser, and the laser emitted by the distributed feedback laser reaches the optical fiber reflector 15 after passing through the polarization controller 12, the optical fiber coupler 13 and the adjustable optical attenuator 14; after being reflected, the laser is fed back to an active region of the distributed feedback laser, so that the steady state of the distributed feedback laser is disturbed, and the distributed feedback laser enters a chaotic state.
Referring to fig. 3, in some embodiments, the beam splitting module 2 includes a fiber optic beam splitter 21, where the fiber optic beam splitter 21 may split the chaotic laser into two beams with equal energy, or may split the chaotic laser into four beams with equal energy.
Referring to fig. 4, in some embodiments, the source loading module 3 is configured to load a source for each path of light beam, so as to obtain multiple paths of chaotic signal light beams each carrying the source, where each path of chaotic signal light beam corresponds to one path of optical channel, each path of optical channel includes various lenses for modulating the chaotic signal light beam, and signals carried by each path of chaotic signal light beam may be the same or different; specifically, the source loading module 3 includes a plurality of optoelectronic intensity modulators 31, each beam split by the optical fiber beam splitter 21 corresponds to one optoelectronic intensity modulator 31, the optoelectronic intensity modulator 31 is used for receiving the beam, the source to be loaded is loaded through the optoelectronic intensity modulator 31, and the chaotic signal beam carrying the source is output from the output end of the optoelectronic intensity modulator 31.
In some embodiments, the column vector beam generating module 4 is configured to convert each chaotic signal beam into a different column vector beam; taking two paths of chaotic signal beams as an example, the column vector beam generating module 4 can adjust the polarization state of each path of chaotic signal beam, modulate each path of chaotic signal beam into a column vector beam, and the polarization state distribution of each path of column vector beam is different.
With continued reference to fig. 4, in some embodiments, the column vector beam generating module 4 includes a polarizer 41 and a vortex wave plate 42 disposed along a propagation direction of each path of the chaotic signal beam, and after the chaotic signal beam is output from the source loading module 3, the chaotic signal beam is modulated by the polarizer 41 and the vortex wave plate 42, and is converted into a column vector beam; wherein the polarization direction of the polarizer 41 of different optical channels corresponds to different combinations of the order of the vortex plate 42 and the 0 deg. fast axis direction to different column vector beams. For example, if the polarization direction of the polarizer 41 is parallel to the 0 ° fast axis direction of the 1 st order vortex wave plate 42, the output light field is a radial polarized light beam; if the polarization direction of the polarizer 41 is perpendicular to the 0 ° fast axis direction of the 1 st order vortex wave plate 42, the output light field is an angular vector light field; when linearly polarized light of any angle passes through the vortex waveplate 42, a generalized cylindrical vector light field can be generated.
With continued reference to fig. 4, taking two chaotic signal beams and two optical channels as examples, the two chaotic signal beams are a first chaotic signal beam and a second chaotic signal beam, the optical channels include a first optical channel G1 and a second optical channel G2, the first chaotic signal beam corresponds to the first optical channel G1, and the second chaotic signal beam corresponds to the second optical channel G2, where:
the polarization direction of the polarizer 41 included in the first optical channel G1 is 90 °, the order of the vortex wave plate 42 included in the first optical channel G1 is 1, and the angle between the 0 ° fast axis direction of the vortex wave plate 42 and the polarization direction of the polarizer 41 is 90 °; the first path of chaotic signal beam is modulated by a polaroid 41 and a vortex wave plate 42 of a first optical channel G1 to form an angular vector beam;
the polarization direction of the polarizing plate 41 provided in the second optical channel G2 is 0 °, the order of the vortex wave plate 42 provided in the second optical channel G2 is 1, and the angle between the 0 ° fast axis direction of the vortex wave plate 42 and the polarization direction of the polarizing plate 41 is 0 °; the second chaotic signal beam is modulated by the polarizer 41 and the vortex wave plate 42 to form a radial vector beam.
Referring to fig. 5, taking four chaotic signal beams and four optical channels as examples, the four chaotic signal beams are a first chaotic signal beam, a second chaotic signal beam, a third chaotic signal beam and a fourth chaotic signal beam, the optical channels include a first optical channel G1, a second optical channel G2, a third optical channel G3 and a fourth optical channel G4, the first chaotic signal beam corresponds to the first optical channel G1, the second chaotic signal beam corresponds to the second optical channel G2, the third chaotic signal beam corresponds to the third optical channel G3 and the fourth chaotic signal beam corresponds to the fourth optical channel G4, wherein lenses included in the first optical channel G1 and the second optical channel G2 are the same as the foregoing embodiments;
the polarization direction of the polarizer 41 provided in the third optical channel G3 is 90 °, the order of the vortex wave plate 42 provided in the third optical channel G3 is 2, and the angle between the 0 ° fast axis direction of the vortex wave plate 42 and the polarization direction of the polarizer 41 is 90 °; after the third chaotic signal beam is modulated by the polaroid 41 and the vortex wave plate 42, a column vector light field with an initial phase of 90 degrees and an order of 2 is formed;
the polarization direction of the polarizing plate 41 provided in the fourth optical channel G4 is 0 °, the order of the vortex wave plate 42 provided in the fourth optical channel G4 is 2, and the angle between the fast axis direction of the vortex wave plate 42 and the polarization direction of the polarizing plate 41 is 0 °; the fourth chaotic signal beam is modulated by the polarizer 41 and the vortex wave plate 42 to form a column vector light field with an initial phase of 0 DEG and an order of 2.
It is understood that the first optical channel G1 and the second optical channel G2 may share the same vortex wave plate 42 (the first vortex wave plate W1), and the third optical channel and the fourth optical channel may share the same vortex wave plate 42 (the second vortex wave plate W2), and the first vortex wave plate W1 and the second vortex wave plate W2 have different orders.
As shown in the above example, it is preferable that the polarization directions of the polarizers 41 in the first and second optical channels G1 and G2 are perpendicular to each other, and the polarization directions of the polarizers 41 in the third and fourth optical channels G3 and G4 are perpendicular to each other. It will be appreciated that cross-talk between signals can be avoided by using orthogonally polarized light as the information carrier. The polarization direction of the polarizer 41 is not limited in the embodiment of the present application, so long as the polarization directions of the polarizers 41 corresponding to different chaotic signal light beams in the same group of chaotic signal light beams are perpendicular to each other.
As can be seen from the above examples, the number of optical channels is preferably an even number, and two optical channels are used as a group, and share one vortex wave plate 42, and the orders of the vortex wave plates 42 used in different groups are different; the polarization directions of the polarizers 41 in the same group of optical channels are perpendicular to each other. Therefore, the polarization directions of the two paths of column vector beams output by the same group of optical channels are mutually perpendicular, and crosstalk of signals transmitted by the same group of optical channels can be avoided. And the column vector beams output by different groups have different orders, so that crosstalk among the column vector beams with different orders cannot cause excessive interference to signals.
In some embodiments, the laser beam may be split into six equal energy beams using fiber beam splitter 21, with one source being loaded for each beam; correspondingly, six paths of optical channels are arranged, two paths of optical channels are used as a group to share one vortex wave plate 42, and the orders of the three vortex wave plates 42 are 1 order, 2 order and 3 order respectively.
The vortex wave plate used in the above embodiment has polarization-dependent optical characteristics, and can be used for generating vector polarized light beams according to the polarization states of incident light beams, so that TEM (transmission electron microscope) can be realized 00 Conversion of a mode Gaussian beam into a "hollow-bore" Laguerre-Gaussian (Laguerre-Gaussian, LG) intensity distribution. When the polarizing plate is used for changing the Gaussian beam output by the laser into the direction of 0-degree fast axis of which the polarization direction is parallel to the vortex wave plate, the output light field is a radial polarized beam, and if the polarization direction of the Gaussian beam is perpendicular to the direction of 0-degree fast axis of the vortex wave plate, the output light field mode is an angular vector light field. When linearly polarized light of any angle passes through the vortex wave plate, a generalized cylindrical vector light field can be generated.
The light field change is characterized by using a Jones matrix, and the linear polarized light with horizontal linear polarization, vertical linear polarization and any angle passes through the vortex wave plate 42 respectively, so that the generated vector light field expression is as follows:
When 0 ° and 90 ° linearly polarized light is used as incident light, the vortex wave plates of different orders will produce four column vector light fields as shown in fig. 6 (M in fig. 6 represents the order of the vortex wave plates).
It can be understood that in the optical path transmission process, because the same-order column vector optical field is in polarization orthogonal distribution, the crosstalk is smaller in the channel transmission, and the later polarization can be decomposed to restore different signals. The column vector optical field crosstalk of different orders does not cause excessive interference to the signal.
With continued reference to fig. 4 and fig. 5, in some embodiments, the chaotic laser generating module 1 and the beam splitting module 2, and the beam splitting module 2 and the optoelectronic intensity modulators 31 are connected by optical fibers, the signal transmitting device 100 further includes a spatial light switching module 5, where the spatial light switching module 5 includes optical fiber collimators disposed along the propagation direction of each path of chaotic signal light beam, and each optoelectronic intensity modulator 31 and the corresponding optical fiber collimator are connected by optical fibers, and through each optical fiber collimator, an optical fiber transmission optical signal can be converted into a spatial transmission mode.
With continued reference to fig. 4 and 5, in some embodiments, the chaotic signal beams of the first optical channel G1 and the second optical channel G2 pass through the corresponding polarizer 41 and then are transmitted to the vortex wave plate 42 with the order of 1 through the first mirror F1. The transmission surface of the first reflector F1 is plated with an antireflection film, and the reflection surface is plated with a reflection film, so that the energy loss of the chaotic signal light beam is reduced. Thus, the first optical channel G1 and the second optical channel G2 can share one first-order vortex wave plate 42 (first vortex wave plate W1).
With continued reference to fig. 5, in some embodiments, the chaotic signal beams of the third optical channel G3 and the fourth optical channel G4 are transmitted to the vortex wave plate 42 with the order of 2 through the second mirror F2 after passing through the corresponding polarizer 41. Similarly, the transmission surface of the second reflector F2 is plated with an antireflection film, and the reflection surface is plated with a reflection film, so that the energy loss of the chaotic signal light beam is reduced. Thus, the third optical channel G3 and the fourth optical channel G4 can share one second-order vortex wave plate 42 (second vortex wave plate W2).
In some embodiments, the light entrance side or the light exit side of the polarizer 41 of the first optical channel G1 is provided with a first total reflection mirror Q1; in this way, the light path direction of the first path of chaotic signal light beam can be changed through the first total reflection mirror Q1, and finally the first path of chaotic signal light beam is combined with the chaotic signal light beam of the second optical channel G2 at the first reflection mirror F1.
In some embodiments, the light entrance side or the light exit side of the polarizer 41 of the third optical channel G3 is provided with a second total reflection mirror Q2; therefore, the light path direction of the third chaotic signal beam can be changed through the second total reflection mirror Q2, and finally the third chaotic signal beam is combined with the fourth chaotic signal beam at the second reflection mirror F2.
In some embodiments, a beam expander 6 (preferably a transmissive galilean beam expander) is provided at the exit end of the signal transmitting device 100. It will be appreciated that the beam expander 6 may be oversized in the diameter of the combined beam, so that an expansion in the size of the spot and a reduction in the divergence angle of the beam may be achieved to provide better directional transmission in space, and the transmissive galilean expander will not interfere with the polarisation of the spot. In the case where there are only two chaotic signal beams (for example, a first chaotic signal beam and a second chaotic signal beam), the exit end of the vortex wave plate 42 having an order of 1 is provided with a beam expander 6.
In some embodiments, in the case of four or more chaotic signal beams, the multiple chaotic signal beams need to be combined, so the signal transmitting device 100 further includes a spatial beam combiner, the spatial beam combiner is used for converging each column vector beam to form a single chaotic signal beam, and a beam expander 6 is disposed at an exit end of the spatial beam combiner.
The signal transmitting device 100 of the embodiment of the application has a simple structure, takes a polarized light field as an information body and takes a base-order vector light field as a carrier wave, so that multi-channel information in a free space is transmitted simultaneously, and the information capacity is expanded; meanwhile, the chaotic signal is used as an encryption means, so that the safety of information transmission is improved.
Claims (13)
1. Signal transmitting device, its characterized in that: comprises a chaotic laser generating module, a beam splitting module, a signal source loading module and a column vector beam generating module,
the chaotic laser generating module is used for generating chaotic laser,
the beam splitting module is used for splitting the chaotic laser into multiple paths of light beams,
the signal source loading module is used for loading the signal source for each path of light beam to obtain a plurality of paths of chaotic signal light beams carrying the signal source,
the column vector light beam generating module is used for respectively converting each path of chaotic signal light beam into different column vector light beams.
2. The signal transmitting apparatus of claim 1, wherein: the column vector light beam generation module comprises polaroids and vortex wave plates which are arranged along the propagation direction of each path of chaotic signal light beam, and different combinations of the polarization directions of the polaroids of different paths of chaotic signal light beams, the order of the vortex wave plates and the 0-degree fast axis direction correspond to different column vector light beams.
3. The signal transmitting apparatus of claim 2, wherein: the number of the chaotic signal light beams is even, and two chaotic signal light beams are a group;
the polarization directions of the polarizers corresponding to different paths of chaotic signal light beams in the same group are mutually perpendicular, vortex wave plates are shared among different paths of chaotic signal light beams in the same group, and the fast axis direction of the vortex wave plates is the same as or perpendicular to the polarization direction of the polarizer corresponding to one path of chaotic signal light beam.
4. A signal transmitting apparatus according to claim 3, wherein: the multipath chaotic signal light beam carrying the information source at least comprises a first path of chaotic signal light beam and a second path of chaotic signal light beam, and the first path of chaotic signal light beam and the second path of chaotic signal light beam share a vortex wave plate with the order of 1;
the polarizing plates corresponding to the first path of chaotic signal light beams and the polarizing plates corresponding to the second path of chaotic signal light beams are perpendicular to each other in polarization direction;
the 0-degree fast axis direction of the vortex wave plate with the order of 1 is perpendicular to the polarization direction of the polarizer corresponding to the first path of chaotic signal light beam.
5. The signal transmitting apparatus of claim 4, wherein: the multipath chaotic signal light beam carrying the information source also comprises a third chaotic signal light beam and a fourth chaotic signal light beam, and the third chaotic signal light beam and the fourth chaotic signal light beam share a vortex wave plate with the order of 2;
the polarizing plates corresponding to the third path of chaotic signal light beams and the polarizing plates corresponding to the fourth path of chaotic signal light beams are perpendicular to each other in polarization direction;
the 0-degree fast axis direction of the vortex wave plate with the order of 2 is perpendicular to the polarization direction of the polarizer corresponding to the third chaotic signal light beam.
6. The signal transmitting apparatus of claim 1, wherein: the chaotic laser generating module comprises a laser, a polarization controller, an optical fiber coupler, an adjustable optical attenuator, an optical fiber reflector and an optical fiber isolator,
the laser output by the laser sequentially passes through the polarization controller, the optical fiber coupler and the adjustable optical attenuator, then enters the optical fiber reflector to generate reflected light, and the reflected light is fed back to the laser through the adjustable optical attenuator, the optical fiber coupler and the polarization controller to cause disturbance to the laser, so that chaotic laser is generated and output to the beam splitting module through the optical fiber isolator.
7. The signal transmitting apparatus of claim 1, wherein: the beam splitting module comprises an optical fiber beam splitter, and the optical fiber beam splitter is used for splitting chaotic laser into multiple paths of light beams.
8. The signal transmitting apparatus of claim 1, wherein: the information source loading module comprises photoelectric intensity modulators which are arranged along the propagation modes of all the light beams and are used for receiving the light beams and loading the information sources.
9. The signal transmitting apparatus of claim 8, wherein: the chaotic laser generating module is connected with the beam splitting module, the beam splitting module is connected with each photoelectric intensity modulator through optical fibers,
the signal transmitting device further comprises a space optical switching module, wherein the space optical switching module comprises optical fiber collimators arranged along the propagation direction of each chaotic signal light beam, each photoelectric intensity modulator is connected with the corresponding optical fiber collimator through an optical fiber, and each optical fiber collimator is used for converting an optical fiber transmission optical signal into a space transmission mode.
10. The signal transmitting apparatus of claim 5, wherein: the first path of chaotic signal light beam and the second path of chaotic signal light beam are transmitted to a vortex wave plate with the order of 1 through a first reflector after passing through corresponding polaroids; and/or
And the third path of chaotic signal light beam and the fourth path of chaotic signal light beam are transmitted to the vortex wave plate with the order of 2 through the second reflector after passing through the corresponding polaroids.
11. The signal transmitting apparatus of claim 10, wherein: a first total reflection mirror is arranged on the light inlet side or the light outlet side of the polaroid corresponding to the first path of chaotic signal light beam; and/or
And a second total reflection mirror is arranged on the light inlet side or the light outlet side of the polaroid corresponding to the third chaotic signal light beam.
12. The signal transmitting apparatus of claim 4, wherein: the emergent end of the vortex wave plate with the order of 1 is provided with a beam expander.
13. The signal transmitting apparatus of claim 5, wherein: the device also comprises a space beam combiner, wherein the space beam combiner is used for converging each path of column vector light beam to form a single chaotic signal light beam, and a beam expander is arranged at the emergent end of the space beam combiner.
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| CN202223537188.2U CN218958922U (en) | 2022-12-29 | 2022-12-29 | Signal transmitting device |
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