CN104122674A - Transmission type polarized independent space optical modulation method and device - Google Patents
Transmission type polarized independent space optical modulation method and device Download PDFInfo
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- CN104122674A CN104122674A CN201410382016.3A CN201410382016A CN104122674A CN 104122674 A CN104122674 A CN 104122674A CN 201410382016 A CN201410382016 A CN 201410382016A CN 104122674 A CN104122674 A CN 104122674A
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Abstract
The invention discloses a transmission type polarized independent space optical modulation method and device. The method achieves transmission-type polarized independent space optical modulation through polarized beam splitting, polarized rotation, transmission-type polarized dependent space optical modulation units and polarized beam combining. The device comprises a polarizing beam splitter, a reflector, a half wavelength plate and the transmission-type polarized dependent space optical modulation units, wherein the polarizing beam splitter, the transmission-type polarized dependent space optical modulation units and the reflector compose a polygonal loop, and the half wavelength plate is arranged inside the loop. Meanwhile, the transmission type polarized independent space optical modulation device can be improved in various ways. The transmission type polarized independent space optical modulation method and device can be applied to various spatial beams such as track angular momentum beams, multicast track angular momentum beams and random space phase modulated beams, thereby having wide application expandability. The transmission type polarized independent space optical modulation method and device can also be applied to achieving polarized independent space optical modulation and meanwhile establishing a full set of polarized independent optical communication system applicable to space beams such as the track angular momentum beams.
Description
Technical field
The invention belongs to optical communication and information optics field, relate to a kind of transmission-type polarization irrelevant spatial optical modulation method and device.
Background technology
Spatial light modulator is that a class can load on information in the light field of one dimension or two dimension, to effectively utilize the device of intrinsic ultrafast speed, concurrency and the interconnection capability of light.This class device can, under the control of time dependent electric drive signal or other signals, change amplitude or intensity, phase place, polarization state and the wavelength of optical field distribution on space, or incoherent light is changed into coherent light.Due to its this character, can be used as tectonic element or crucial device in the systems such as real-time optical information processing, adaptive optics, photometry calculation and optical neural network.At present, LCD space light modulator resolution improves and response speed is accelerated, and becomes a vital classification in spatial light modulator.This wherein, in nematic crystal (Nematic Liquid Crystal) spatial light modulator because liquid crystal molecule has birefringent characteristic, show ordinary light (o light) refractive index direction and extraordinary ray (e light) refractive index direction, in the time that incident light polarization state is consistent with o light direction, because o optical index does not change with liquid crystal on-load voltage, therefore incident light can be not modulated, in the time that incident light polarization state is consistent with e light direction, because e optical index is along with liquid crystal institute on-load voltage can change, therefore incident light also can change along with liquid crystal institute on-load voltage through the phase shift after liquid crystal, be subject to phase-modulation, diverse location place, space liquid crystal loads different Control of Voltage, can realize incident light spatial light field phase-modulation.Visible, traditional nematic crystal spatial light modulator has polarization dependent behavior.Moreover, a lot of devices that other type has spatial light modulation also all have polarization dependent behavior, require the individual incident polarization direction of incident light tool just can obtain effective spatial light modulation.
But, in a lot of practical applications, due to the diversity of incident light polarization state thereby extensively need the device of polarization irrelevant.Such as, mixed polarized multiplexed beam in optical communication system in flexible and changeable linearly polarized light and the polarisation multiplex system in the polarization direction of widespread use, in this case, use polarization correlation space optical modulation device to satisfy the demands, meanwhile, the application that is circularly polarized light or elliptic polarization light time polarization correlation space optical modulation device when incident light also will be greatly limited.Therefore, in order to meet the active demand of following optical communication for polarization irrelevant operation, the significant challenge facing is how to realize polarization irrelevant spatial light modulation and how to utilize existing polarization correlation space optical modulation device to build a polarization irrelevant spatial light modulating apparatus.In this invention, will provide a kind of transmission-type polarization irrelevant spatial optical modulation method and device.
Summary of the invention
The invention provides a kind of transmission-type polarization irrelevant spatial optical modulation method and device, object is to break through existing transmission-type polarization correlation space optical modulation device and is only applicable to the limitation of particular polarization input line polarized light, target is to utilize transmission-type polarization correlation space optical modulation device to build and realize transmission-type polarization irrelevant spatial light modulation, the range of application of optical modulation so that expand space comprehensively, is particularly widely used in the efficient spatial optical modulation for input different polarization states linearly polarized light, palarization multiplexing light beam, circular polarization/elliptically polarized light.
A kind of transmission-type polarization irrelevant spatial optical modulation method provided by the invention, the method resolves into incident beam transmitted light beam and the folded light beam of two-way polarized orthogonal, wherein transmitted light beam is along clockwise direction through arriving transmission-type polarization correlation space optical modulation device after N+1 secondary reflection, N=0, 1, 2, 3, folded light beam is in the counterclockwise direction through arriving transmission-type polarization correlation space optical modulation device after N+2M+2 secondary reflection, N+2M+2 >=1, N=0, 1, 2, 3, M=0, ± 1, ± 2, the polarization direction of clockwise and counterclockwise two-way light beam was adjusted to consistent with transmission-type polarization correlation space optical modulation device work polarization direction before arriving transmission-type polarization correlation space optical modulation device, be transmitted again the modulation of formula polarization correlation space optical modulation device, finally, clockwise and counterclockwise two-way is exported through the light beam of transmission-type spatial light modulation respectively after polarization coupling again, thereby realize the polarization irrelevant spatial light modulation to incident beam.
One as technique scheme is improved, described clockwise and counter clockwise direction light beam formation polygon loop, and along clockwise direction with anticlockwise two-way light beam after through the modulation of transmission-type polarization correlation space optical modulation device, until export after polarization coupling, the equivalent optical path experiencing, meanwhile, the order of reflection of process be all odd number time or be all even number.
Another kind as technique scheme improves, described incident beam is consistent with the work polarization direction of transmission-type polarization correlation space optical modulation device through the polarization direction of the clockwise direction transmitted light beam of polarization beam splitting gained, clockwise direction light beam need not regulate polarization direction before arriving transmission-type polarization correlation space optical modulation device, counterclockwise light beam before arriving transmission-type polarization correlation space optical modulation device half-twist with consistent with transmission-type polarization correlation space optical modulation device work polarization direction; After the modulation of transmission-type polarization correlation space optical modulation device, counterclockwise light beam need not regulate polarization direction before final polarization coupling, clockwise direction light beam before final polarization coupling half-twist then to close bundle output with counter clockwise direction light beam polarization is orthogonal.
As another improvement of technique scheme, described incident beam is orthogonal through the polarization direction of the clockwise direction transmitted light beam of polarization beam splitting gained and the work polarization direction of transmission-type polarization correlation space optical modulation device, counterclockwise light beam need not regulate polarization direction before arriving transmission-type polarization correlation space optical modulation device, clockwise direction light beam before arriving transmission-type polarization correlation space optical modulation device half-twist with consistent with transmission-type polarization correlation space optical modulation device work polarization direction; After the modulation of transmission-type polarization correlation space optical modulation device, clockwise direction light beam need not regulate polarization direction before final polarization coupling, counterclockwise light beam before final polarization coupling half-twist then to close bundle output with clockwise direction light beam polarization is orthogonal.
As another improvement of technique scheme, described incident beam is both inconsistent also non-orthogonal through the polarization direction of the clockwise direction transmitted light beam of polarization beam splitting gained and the work polarization direction of transmission-type polarization correlation space optical modulation device, there is an angle X °, clockwise direction light beam rotated X ° with consistent with transmission-type polarization correlation space optical modulation device work polarization direction before arriving transmission-type polarization correlation space optical modulation device, counterclockwise light beam before arriving transmission-type polarization correlation space optical modulation device rotation (X+90) ° with consistent with transmission-type polarization correlation space optical modulation device work polarization direction, after the modulation of transmission-type polarization correlation space optical modulation device, counterclockwise light beam before final polarization coupling rotation-X ° with consistent through polarization beam splitting gained transmitted light polarization direction with incident beam, clockwise direction light beam rotation before final polarization coupling-(X+90) is ° to export with the orthogonal bundle that then closes of counter clockwise direction light beam polarization.
A kind of transmission-type polarization irrelevant spatial light modulating apparatus provided by the invention, this device comprises polarizing beam splitter mirror, first, second, third catoptron, the first half-wave plate, transmission-type polarization correlation space optical modulation device; Described transmission-type polarization correlation space optical modulation device is between first, second, third catoptron link, between second, third catoptron or between first, second catoptron; Described polarizing beam splitter mirror, transmission-type polarization correlation space optical modulation device and each catoptron form polygon loop; Along clockwise direction from polarizing beam splitter mirror to N the 4th catoptron, N=0,1 are set transmission-type polarization correlation space optical modulation device link, 2,3 ..., in the counterclockwise direction from polarizing beam splitter mirror to N+2M the 5th catoptron is set transmission-type polarization correlation space optical modulation device link, N+2M >=0, N=0,1,2,3, M=0, ± 1, ± 2, Along clockwise direction with anticlockwise two-way light beam after through the modulation of described transmission-type polarization correlation space optical modulation device, close bundle output until reach polarizing beam splitter mirror, the equivalent optical path experiencing, meanwhile, the order of reflection of process be all odd number time or be all even number.
If the work polarization direction of transmission-type polarization correlation space optical modulation device is consistent with polarizing beam splitter mirror transmitted light beam polarization direction, the first half-wave plate is in the counterclockwise direction from polarizing beam splitter mirror to optional position transmission-type polarization correlation space optical modulation device link; If work polarization direction and the polarizing beam splitter mirror transmitted light beam polarization direction of transmission-type polarization correlation space optical modulation device are orthogonal, the first half-wave plate is along clockwise direction from polarizing beam splitter mirror to optional position transmission-type polarization correlation space optical modulation device link; The work polarization direction angle of the optical axis of the first half-wave plate and transmission-type polarization correlation space optical modulation device is 45 °.
One as the above-mentioned technical scheme about device is improved, if work polarization direction and the polarizing beam splitter mirror transmitted light beam polarization direction of transmission-type polarization correlation space optical modulation device are both inconsistent also non-orthogonal, the first half-wave plate is in the counterclockwise direction from polarizing beam splitter mirror to optional position transmission-type polarization correlation space optical modulation device link, to transmission-type polarization correlation space optical modulation device link, the second half-wave plate is being set from polarizing beam splitter mirror along clockwise direction, and the angle of the optical axis of the second half-wave plate and polarizing beam splitter mirror transmitted light beam polarization direction is 1/2 of the work polarization direction of transmission-type polarization correlation space optical modulation device and polarizing beam splitter mirror transmitted light beam polarization direction angle, the optical axis included angle of the optical axis of the first half-wave plate and the second half-wave plate is 45 °.
Another kind as the above-mentioned technical scheme about device improves, and described transmission-type polarization correlation space optical modulation device refers to the relevant spatial light modulator of various transmission-type polarizations including LCD space light modulator.
The polarization irrelevant optical communication system that is applicable to spatial beam being formed by said apparatus, it is characterized in that, this system comprises light source, first, second beam splitter, receiver, and two described transmission-type polarization irrelevant spatial light modulating apparatus, wherein, a transmission-type polarization irrelevant spatial light modulating apparatus is for modulation, and another transmission-type polarization irrelevant spatial light modulating apparatus is for demodulation;
The light beam being produced by described light source is through the first beam splitter, load spatial light modulation information and return along original optical path for the transmission-type polarization irrelevant spatial light modulating apparatus of modulating through described from the light beam of the first beam splitter transmission outgoing, oppositely incident the first beam splitter, the light beam that reflects outgoing from the first beam splitter is again through the second beam splitter, load spatial light demodulating information and return along original optical path through the described transmission-type polarization irrelevant spatial light modulating apparatus for demodulation from the light beam of the second beam splitter transmission outgoing, oppositely incident the second beam splitter, finally, enter receiver from the light beam coupling of the second beam splitter reflection outgoing, complete communication process.
The present invention has following beneficial effect:
1, can only modulate the linearly polarized light beam of a certain specific direction than traditional transmission-type polarization correlation space optical modulation device, transmission-type spatial optical modulation method of the present invention and device have polarization-independent characteristic, it has expanded the range of application of spatial light modulation comprehensively, can be widely used in the efficient spatial optical modulation for input different polarization states linearly polarized light, palarization multiplexing light beam, circular polarization/elliptically polarized light.
2, the scheme that polarizing beam splitter mirror, catoptron, half-wave plate and the transmission-type polarization correlation space optical modulation device that the present invention adopts combines provides a kind of brand-new thinking and has been simple and easy to the device of realizing for realizing polarization irrelevant spatial light modulation.
3, transmission-type polarization irrelevant spatial light modulation of the present invention goes for multiple spatial beam, as the light beam of the orbital angular momentum light beam of orbital angular momentum light beam, multiplex broadcasting, arbitrarily space phase modulation etc., thereby has and applies very widely extensibility.
4, transmission-type polarization irrelevant spatial light modulation of the present invention can also be used for realizing the demodulation of polarization irrelevant spatial light, can build a whole set of simultaneously and be applicable to the polarization irrelevant optical communication system that spatial beam (as orbital angular momentum light beam) participates in.
Brief description of the drawings
Fig. 1 is a kind of structural representation of transmission-type polarization irrelevant spatial light modulating apparatus provided by the invention;
Fig. 2 is the another kind of structural representation of transmission-type polarization irrelevant spatial light modulating apparatus provided by the invention;
Fig. 3 is that the one of transmission-type polarization irrelevant spatial light modulating apparatus provided by the invention is improved structure;
Fig. 4 is that the another kind of transmission-type polarization irrelevant spatial light modulating apparatus provided by the invention improves structure;
Fig. 5 is the structural representation of a kind of polarization irrelevant optical communication system that is applicable to spatial beam participation provided by the invention;
Fig. 6 is the structural representation of the another kind of polarization irrelevant optical communication system that is applicable to spatial beam participation provided by the invention;
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described further.It should be noted that at this, be used for helping to understand the present invention for the explanation of these embodiments, but do not form limitation of the invention.In addition,, in each embodiment of described the present invention, involved technical characterictic just can combine mutually as long as do not form each other conflict.
Figure 1 shows that a kind of transmission-type polarization irrelevant spatial optical modulation method provided by the invention and device, Figure 2 shows that another kind of transmission-type polarization irrelevant spatial optical modulation method and device that invention provides.
The invention provides transmission-type polarization irrelevant spatial optical modulation method, embodiment is as follows:
Incident beam is first passed through to polarization beam splitting, resolve into the orthogonal light beam of two-way, one road light beam is directly transmitted the modulation of formula polarization correlation space optical modulation device, another road light beam is through half-wave plate, make after polarization state half-twist becomes the polarization state that corresponding transmission-type polarization correlation space optical modulation device can modulate, be transmitted again the modulation of formula polarization correlation space optical modulation device, finally, two-way is exported through the light beam of spatial light modulation respectively after polarization coupling again, thereby has realized the polarization irrelevant spatial light modulation to incident beam.If in actual applications along clockwise direction with anticlockwise two-way light beam after through the modulation of transmission-type polarization correlation space optical modulation device, until the light path of exporting after polarization coupling is unequal, can cause clockwise direction light beam and counter clockwise direction light beam beam characteristics inconsistent (spot size that produces orbital angular momentum light beam as spatial light modulation is inconsistent) in the time of final polarization coupling output, and then polarisation-affecting independent space optical modulation performance.Therefore, light path must ensure: 1) along clockwise direction with anticlockwise two-way light beam after through the modulation of transmission-type polarization correlation space optical modulation device, until after polarization coupling, export experienced equivalent optical path (such as: in Fig. 1, meet AB+BC+CD=AE+DE, in Fig. 2, meet AB+BD=AE+CE+CD), 2) consider the mirror image symmetric effect (as can the reverse symbol of orbital angular momentum light beam of odd number secondary reflection) of reflection process, for keeping clockwise direction light beam and counter clockwise direction light beam beam characteristics in the time that final polarization coupling is exported consistent, for two-way light beam clockwise and counterclockwise after the modulation of transmission-type polarization correlation space optical modulation device until finally after polarization coupling in output procedure, not only to meet the equivalent optical path of clockwise direction light beam and counter clockwise direction light beam, also to meet clockwise direction light beam and counterclockwise light beam through order of reflection be all odd number time or be all even number (such as: in Fig. 1 clockwise direction light beam after the modulation of transmission-type polarization correlation space optical modulation device until finally after polarization coupling in output procedure altogether through 3 secondary reflections, counterclockwise light beam is through 1 secondary reflection, be all odd number secondary reflection, in Fig. 2, clockwise direction light beam is through 2 secondary reflections, and counterclockwise light beam, also through 2 secondary reflections, is all even number secondary reflection).Meanwhile, consider in actual applications the dirigibility demand of light path design, in Fig. 1 and Fig. 2, to transmission-type polarization correlation space optical modulation device link, increase N (N=0,1,2 from polarizing beam splitter mirror along clockwise direction, 3,) individual catoptron, in the counterclockwise direction from polarizing beam splitter mirror to corresponding N+2M (N+2M >=0, the N=0 of increasing transmission-type polarization correlation space optical modulation device link, 1,2,3, M=0, ± 1, ± 2 ...) individual catoptron; Simultaneously, improve technical scheme for two-way light beam clockwise and counterclockwise after the modulation of transmission-type polarization correlation space optical modulation device until finally export after polarization coupling, to meet equally following two essential condition: the 1) equivalent optical path of clockwise direction light beam and counter clockwise direction light beam; 2) clockwise direction light beam and counterclockwise the order of reflection of light beam process be all odd number time or be all even number.
The invention provides transmission-type polarization irrelevant spatial light modulating apparatus, be described as follows:
This device comprises polarizing beam splitter mirror 1, first, second, the 3rd catoptron 3, 4, 6, the first half-wave plate 2 and transmission-type polarization correlation space optical modulation device 5, wherein polarizing beam splitter mirror 1, the first half-wave plate 2, transmission-type polarization correlation space optical modulation device 5 and the first catoptron 3, the second catoptron 4, the 3rd catoptron 6 forms polygon loop, the first half-wave plate 2 is arranged in polygon loop, in Fig. 1, transmission-type polarization correlation space optical modulation device 5 is between the second catoptron 4 and the 3rd catoptron 6, in Fig. 2, transmission-type polarization correlation space optical modulation device 5 is between the first catoptron 3 and the second catoptron 4.To transmission-type polarization correlation space optical modulation device 5 links, be provided with N (N=0 from polarizing beam splitter mirror 1 along clockwise direction, 1,2,3 ...) individual the 4th catoptron, to transmission-type polarization correlation space optical modulation device 5 links, N+2M (N+2M >=0 is set from polarizing beam splitter mirror 1 in the counterclockwise direction, N=0,1,2,3, M=0, ± 1, ± 2 ...) individual the 5th catoptron.Along clockwise direction with anticlockwise two-way light beam after through 5 modulation of transmission-type polarization correlation space optical modulation device, close bundle output until reach polarizing beam splitter mirror 1, the equivalent optical path experiencing, meanwhile, the order of reflection of process be all odd number time or be all even number.
When incident light will resolve into the orthogonal two-beam of polarization state through after polarizing beam splitter mirror 1, might as well suppose that transmitted light is X polarized light, in loop, to propagate along clockwise direction, reflected light is Y polarized light, in loop, propagates in the counterclockwise direction.The present invention first supposes that transmission-type polarization correlation space optical modulation device 5 is operated in X polarization state, now the first half-wave plate 2 in the counterclockwise direction from polarizing beam splitter mirror 1 to optional position transmission-type polarization correlation space optical modulation device 5 links (Fig. 1 and Fig. 2 illustrate between polarizing beam splitter mirror 1 and the first catoptron 3), and work polarization direction (X polarization) angle of the optical axis of the first half-wave plate 2 and transmission-type polarization correlation space optical modulation device 5 is 45 °.For incident beam through transmitted light beam (X polarization) along clockwise direction after polarizing beam splitter mirror 1, in Fig. 1, first reflected after reflecting by the second catoptron 4 and the first catoptron 3 after being then transmitted formula polarization correlation space optical modulation device 5 and modulating and enter the first half-wave plate 2 by the 3rd catoptron 6, polarization state half-twist becomes Y polarization, then enter polarizing beam splitter mirror 1 and reflect outgoing, in Fig. 2, first reflected after reflecting by the first catoptron 3 after being then transmitted formula polarization correlation space optical modulation device 5 and modulating and enter the first half-wave plate 2 by the 3rd catoptron 6 and the second catoptron 4, polarization state half-twist becomes Y polarization, then enter polarizing beam splitter mirror 1 and reflect outgoing, for incident beam through folded light beam (Y polarization) in the counterclockwise direction after polarizing beam splitter mirror 1, in Fig. 1, become X polarization by polarization state half-twist after the first half-wave plate 2, just in time consistent with transmission-type polarization correlation space optical modulation device 5 polarization state of working, after the first catoptron 3 and the second catoptron 4 reflections, being transmitted formula polarization correlation space optical modulation device 5 modulates, after the 3rd catoptron 6 reflections, enter again polarizing beam splitter mirror 1 transmission output, in Fig. 2, become X polarization by polarization state half-twist after the first half-wave plate 2, just in time consistent with transmission-type polarization correlation space optical modulation device 5 polarization state of working, after the first catoptron 3 reflections, being transmitted formula polarization correlation space optical modulation device 5 modulates, after the second catoptron 4 and the 3rd catoptron 6 reflections, enter polarizing beam splitter mirror 1 transmission output again.Like this, no matter be that Fig. 1 or Fig. 2 have just completed difference spatial light modulation and then polarization coupling after incident beam polarization beam splitting, thereby realized polarization irrelevant spatial light modulation.Similarly, the work polarization direction of transmission-type polarization correlation space optical modulation device 5 and polarizing beam splitter mirror 1 transmitted light beam polarization direction if orthogonal (Y polarization), the first half-wave plate 2 is along clockwise direction from polarizing beam splitter mirror 1 to optional position transmission-type polarization correlation space optical modulation device 5 links, and work polarization direction (Y polarization) angle of the first half-wave plate 2 optical axises and transmission-type polarization correlation space optical modulation device 5 is still 45 °.
Be illustrated in figure 3 corresponding with Fig. 1 provided by the invention a kind of improving one's methods and installing of transmission-type polarization irrelevant spatial light modulation that realize.Be illustrated in figure 4 the provided by the invention another kind corresponding with Fig. 2 and realize improving one's methods and installing of transmission-type polarization irrelevant spatial light modulation.
Provided by the inventionly realize improving one's methods of transmission-type polarization irrelevant spatial light modulation, embodiment is as follows:
If incident beam transmission after polarizing beam splitter mirror is all inconsistent with the work polarization direction of transmission-type polarization correlation space optical modulation device with the polarization direction of reflection two-way light beam, just there is defect in such scheme, now improvement project will be used two half-wave plates, one of them half-wave plate is along clockwise direction from polarizing beam splitter mirror to transmission-type polarization correlation space optical modulation device link, the angle of its optical axis direction and polarizing beam splitter mirror transmitted light beam polarization direction is the work polarization direction of transmission-type polarization correlation space optical modulation device and the half of polarizing beam splitter mirror transmitted light beam polarization direction angle, polarizing beam splitter mirror transmitted light beam will be consistent with the work polarization direction of transmission-type polarization correlation space optical modulation device through its polarization direction after this half-wave plate so along clockwise direction, another one half-wave plate is in the counterclockwise direction from polarizing beam splitter mirror to transmission-type polarization correlation space optical modulation device link, its optical axis direction and previous half-wave plate optical axis direction angle are 45 °, and polarizing beam splitter mirror folded light beam also will be consistent with the work polarization direction of transmission-type polarization correlation space optical modulation device through its polarization direction after this half-wave plate so in the counterclockwise direction.
The modifying device of realizing transmission-type polarization irrelevant spatial light modulation provided by the invention, is described as follows:
This device comprises polarizing beam splitter mirror 1, first, second, third catoptron 3,4,6, first, second half-wave plate 2,7 and transmission-type polarization correlation space optical modulation device 5, wherein polarizing beam splitter mirror 1, first, second half-wave plate 2,7, transmission-type polarization correlation space optical modulation device 5 and the first catoptron 3, the second catoptron 4, the 3rd catoptron 6 form polygon loop.The first half-wave plate 2 in the counterclockwise direction from polarizing beam splitter mirror 1 to optional position transmission-type polarization correlation space optical modulation device 5 links (Fig. 3 and Fig. 4 illustrate between polarizing beam splitter mirror 1 and the first catoptron 3), the second half-wave plate 7 along clockwise direction from polarizing beam splitter mirror 1 to optional position transmission-type polarization correlation space optical modulation device 5 links (Fig. 3 and Fig. 4 illustrate between polarizing beam splitter mirror 1 and the 3rd catoptron 6).Similar with Fig. 1, in Fig. 3, transmission-type polarization correlation space optical modulation device 5 is between the second catoptron 4 and the 3rd catoptron 6, similar with Fig. 2, and in Fig. 4, transmission-type polarization correlation space optical modulation device 5 is between the first catoptron 3 and the second catoptron 4.The angle of second half-wave plate 7 its optical axis directions and polarizing beam splitter mirror 1 transmitted light beam polarization direction is the work polarization direction of transmission-type polarization correlation space optical modulation device 5 and the half of polarizing beam splitter mirror 1 transmitted light beam polarization direction angle.45 ° of first half-wave plate 2 its optical axis directions and the second half-wave plate 7 optical axis direction angles.After incident beam is by polarizing beam splitter mirror 1, will resolve into the orthogonal two-beam of polarization state, might as well suppose that transmitted light is X polarized light, in loop, propagate along clockwise direction, reflected light is Y polarized light, in loop, propagates in the counterclockwise direction.The present invention supposes that polarization dependent transmissive formula spatial light modulator work polarization direction is X
1polarization state.For polarizing beam splitter mirror 1 transmitted light beam (X polarization), become X through the second half-wave plate 7 rear polarizer states along clockwise direction
1polarization, in Fig. 3, after the 3rd catoptron 6 reflections, being transmitted formula polarization correlation space optical modulation device 5 modulates, then via after the second catoptron 4 and the first catoptron 3 reflections, by the first half-wave plate 2, polarization state becomes Y polarization, enter again polarizing beam splitter mirror 1 and reflect outgoing, in Fig. 4, after the 3rd catoptron 6 and the second catoptron 4 reflections, being transmitted formula polarization correlation space optical modulation device 5 modulates, then via after the first catoptron 3 reflections, by the first half-wave plate 2, polarization state becomes Y polarization, then enters polarizing beam splitter mirror 1 and reflect outgoing, for polarizing beam splitter mirror 1 folded light beam (Y polarization), become X through the first half-wave plate 2 rear polarizer states in the counterclockwise direction
1polarization, just in time corresponding transmission-type polarization correlation space optical modulation device 5 polarization direction of working, after being reflected by the first catoptron 3 and the second catoptron 4 in Fig. 3, modulate through transmission-type polarization correlation space optical modulation device 5, then reflected by the 3rd catoptron 6, through the second half-wave plate 7, polarization state is become to X polarization, enter again polarizing beam splitter mirror 1 transmission outgoing, after being reflected by the first catoptron 3 in Fig. 4, modulate through transmission-type polarization correlation space optical modulation device 5, then reflected by the second catoptron 4 and the 3rd catoptron 6, through the second half-wave plate 7, polarization state is become to X polarization, enter again polarizing beam splitter mirror 1 transmission outgoing.Like this, no matter be Fig. 3 or Fig. 4 modifying device, just complete difference spatial light modulation and then polarization coupling after incident beam polarization beam splitting, thereby realized polarization irrelevant spatial light modulation.
Be the polarization irrelevant optical communication system that is applicable to spatial beam of utilizing the method and apparatus of transmission-type polarization irrelevant spatial light modulation to realize provided by the invention as shown in Figure 5 and Figure 6.Wherein, in Fig. 5, transmission-type polarization irrelevant spatial optical modulation method and device are corresponding with Fig. 3, and in Fig. 6, transmission-type polarization irrelevant spatial optical modulation method and device are corresponding with Fig. 4.
The polarization irrelevant optical communication system that is applicable to spatial beam of utilizing the method and apparatus of transmission-type polarization irrelevant spatial light modulation to realize provided by the invention, embodiment is as follows:
The device of transmission-type polarization irrelevant spatial light modulation equally also can be for realizing the demodulation of polarization irrelevant spatial light, be that identical device not only can be realized polarization irrelevant spatial light modulation (if Gaussian beam is to the conversion of orbital angular momentum light beam) for transmitter terminal, also can realize polarization irrelevant spatial light demodulation (if orbital angular momentum light beam is to the conversion of class Gaussian beam) for receiver end.As the further improvement of technique scheme, as shown in Figure 5 and Figure 6, use two covering devices simultaneously, be respectively used to the polarization irrelevant spatial light modulation of transmitter terminal and the polarization irrelevant spatial light demodulation of receiver end, and then build a set of polarization irrelevant optical communication system that spatial beam (as orbital angular momentum light beam) participates in that is applicable to.
The polarization irrelevant optical communication system that is applicable to spatial beam of utilizing the method and apparatus of transmission-type polarization irrelevant spatial light modulation to realize provided by the invention, is described as follows:
This system is by light source 100, first, the second beam splitter 200, 400, transmission-type polarization irrelevant spatial light modulating apparatus 300, transmission-type polarization irrelevant spatial light demodulating equipment 500 and receiver 600 form, wherein transmission-type polarization irrelevant spatial light modulating apparatus 300 and transmission-type polarization irrelevant spatial light demodulating equipment 500 are the device shown in Fig. 3 (corresponding with Fig. 5) and Fig. 4 (corresponding with Fig. 6), only need in 300, load spatial light modulation information (as helical phase modulation orbital angular momentum pattern) by transmission-type polarization correlation space optical modulation device, in 500, polarization correlation space optical modulation device loads spatial light demodulating information (as antispin phase demodulating orbital angular momentum pattern).Especially, this system can also expand to multichannel in Cong Yi road.
Transmission-type polarization correlation space optical modulation device of the present invention refers to the polarization correlation space photomodulator of the various transmission-types including LCD space light modulator.
The present invention is not only confined to above-mentioned embodiment; persons skilled in the art are according to content disclosed by the invention; can adopt other multiple embodiment to implement the present invention; therefore; every employing project organization of the present invention and thinking; do some simple designs that change or change, all fall into the scope of protection of the invention.
Claims (9)
1. a transmission-type polarization irrelevant spatial optical modulation method, it is characterized in that, the method resolves into incident beam transmitted light beam and the folded light beam of two-way polarized orthogonal, wherein transmitted light beam is along clockwise direction through arriving transmission-type polarization correlation space optical modulation device after N+1 secondary reflection, N=0, 1, 2, 3, folded light beam is in the counterclockwise direction through arriving transmission-type polarization correlation space optical modulation device after N+2M+2 secondary reflection, N+2M+2 >=1, N=0, 1, 2, 3, M=0, ± 1, ± 2, the polarization direction of clockwise and counterclockwise two-way light beam was adjusted to consistent with transmission-type polarization correlation space optical modulation device work polarization direction before arriving transmission-type polarization correlation space optical modulation device, be transmitted again the modulation of formula polarization correlation space optical modulation device, finally, clockwise and counterclockwise two-way is exported through the light beam of transmission-type spatial light modulation respectively after polarization coupling again, thereby realize the polarization irrelevant spatial light modulation to incident beam.
2. transmission-type polarization irrelevant spatial optical modulation method according to claim 1, it is characterized in that, described clockwise and counter clockwise direction light beam formation polygon loop, and along clockwise direction with anticlockwise two-way light beam after through the modulation of transmission-type polarization correlation space optical modulation device, until export after polarization coupling, the equivalent optical path experiencing, meanwhile, the order of reflection of process be all odd number time or be all even number.
3. transmission-type polarization irrelevant spatial optical modulation method according to claim 1, it is characterized in that, described incident beam is consistent with the work polarization direction of transmission-type polarization correlation space optical modulation device through the polarization direction of the clockwise direction transmitted light beam of polarization beam splitting gained, clockwise direction light beam need not regulate polarization direction before arriving transmission-type polarization correlation space optical modulation device, counterclockwise light beam before arriving transmission-type polarization correlation space optical modulation device half-twist with consistent with transmission-type polarization correlation space optical modulation device work polarization direction, after the modulation of transmission-type polarization correlation space optical modulation device, counterclockwise light beam need not regulate polarization direction before final polarization coupling, clockwise direction light beam before final polarization coupling half-twist then to close bundle output with counter clockwise direction light beam polarization is orthogonal.
4. transmission-type polarization irrelevant spatial optical modulation method according to claim 1, it is characterized in that, described incident beam is orthogonal through the polarization direction of the clockwise direction transmitted light beam of polarization beam splitting gained and the work polarization direction of transmission-type polarization correlation space optical modulation device, counterclockwise light beam need not regulate polarization direction before arriving transmission-type polarization correlation space optical modulation device, clockwise direction light beam before arriving transmission-type polarization correlation space optical modulation device half-twist with consistent with transmission-type polarization correlation space optical modulation device work polarization direction, after the modulation of transmission-type polarization correlation space optical modulation device, clockwise direction light beam need not regulate polarization direction before final polarization coupling, counterclockwise light beam before final polarization coupling half-twist then to close bundle output with clockwise direction light beam polarization is orthogonal.
5. transmission-type polarization irrelevant spatial optical modulation method according to claim 1, it is characterized in that, described incident beam is both inconsistent also non-orthogonal through the polarization direction of the clockwise direction transmitted light beam of polarization beam splitting gained and the work polarization direction of transmission-type polarization correlation space optical modulation device, there is an angle X °, clockwise direction light beam rotated X ° with consistent with transmission-type polarization correlation space optical modulation device work polarization direction before arriving transmission-type polarization correlation space optical modulation device, counterclockwise light beam before arriving transmission-type polarization correlation space optical modulation device rotation (X+90) ° with consistent with transmission-type polarization correlation space optical modulation device work polarization direction, after the modulation of transmission-type polarization correlation space optical modulation device, counterclockwise light beam before final polarization coupling rotation-X ° with consistent through polarization beam splitting gained transmitted light polarization direction with incident beam, clockwise direction light beam rotation before final polarization coupling-(X+90) is ° to export with the orthogonal bundle that then closes of counter clockwise direction light beam polarization.
6. a transmission-type polarization irrelevant spatial light modulating apparatus, it is characterized in that, this device comprises polarizing beam splitter mirror (1), first, second, third catoptron (3,4,6), the first half-wave plate (2), transmission-type polarization correlation space optical modulation device (5); Described transmission-type polarization correlation space optical modulation device (5) is positioned between first, second, third catoptron (3,4,6) link, is positioned between second, third catoptron (4,6) or between first, second catoptron (3,4); Described polarizing beam splitter mirror (1), transmission-type polarization correlation space optical modulation device (5) and each catoptron form polygon loop; Along clockwise direction from polarizing beam splitter mirror (1) to N the 4th catoptron, N=0,1 are set transmission-type polarization correlation space optical modulation device (5) link, 2,3 ..., in the counterclockwise direction from polarizing beam splitter mirror (1) to N+2M the 5th catoptron is set transmission-type polarization correlation space optical modulation device (5) link, N+2M >=0, N=0,1,2,3, M=0, ± 1, ± 2, Along clockwise direction with anticlockwise two-way light beam through described transmission-type polarization correlation space optical modulation device (5) modulation after, close bundle output until reach polarizing beam splitter mirror (1), the equivalent optical path experiencing, meanwhile, the order of reflection of process be all odd number time or be all even number.
If the work polarization direction of transmission-type polarization correlation space optical modulation device (5) is consistent with polarizing beam splitter mirror (1) transmitted light beam polarization direction, the first half-wave plate (2) is positioned in the counterclockwise direction from polarizing beam splitter mirror (1) to optional position transmission-type polarization correlation space optical modulation device (5) link; If the work polarization direction of transmission-type polarization correlation space optical modulation device (5) and polarizing beam splitter mirror (1) transmitted light beam polarization direction are orthogonal, the first half-wave plate (2) is positioned at along clockwise direction from polarizing beam splitter mirror (1) to optional position transmission-type polarization correlation space optical modulation device (5) link; The work polarization direction angle of the optical axis of the first half-wave plate (2) and transmission-type polarization correlation space optical modulation device (5) is 45 °.
7. device according to claim 6, it is characterized in that, the work polarization direction of transmission-type polarization correlation space optical modulation device (5) and polarizing beam splitter mirror (1) transmitted light beam polarization direction are both inconsistent also non-orthogonal, the first half-wave plate (2) is positioned in the counterclockwise direction from polarizing beam splitter mirror (1) to optional position transmission-type polarization correlation space optical modulation device (5) link, to transmission-type polarization correlation space optical modulation device (5) link, the second half-wave plate (7) is being set from polarizing beam splitter mirror (1) along clockwise direction, and the angle of the optical axis of the second half-wave plate (7) and polarizing beam splitter mirror (1) transmitted light beam polarization direction is 1/2 of the work polarization direction of transmission-type polarization correlation space optical modulation device (7) and polarizing beam splitter mirror (1) transmitted light beam polarization direction angle, the optical axis included angle of the optical axis of the first half-wave plate (2) and the second half-wave plate (7) is 45 °.
8. according to the device described in claim 6 or 7, it is characterized in that, described transmission-type polarization correlation space optical modulation device refers to the relevant spatial light modulator of various transmission-type polarizations including LCD space light modulator.
9. by according to claim 6,7, the polarization irrelevant optical communication system that is applicable to spatial beam that in 8, arbitrary described device forms, is characterized in that, this system comprises light source, first, second beam splitter, receiver, and two described transmission-type polarization irrelevant spatial light modulating apparatus, wherein, a transmission-type polarization irrelevant spatial light modulating apparatus is for modulation, and another transmission-type polarization irrelevant spatial light modulating apparatus is for demodulation;
The light beam being produced by described light source is through the first beam splitter, load spatial light modulation information and return along original optical path for the transmission-type polarization irrelevant spatial light modulating apparatus of modulating through described from the light beam of the first beam splitter transmission outgoing, oppositely incident the first beam splitter, the light beam that reflects outgoing from the first beam splitter is again through the second beam splitter, load spatial light demodulating information and return along original optical path through the described transmission-type polarization irrelevant spatial light modulating apparatus for demodulation from the light beam of the second beam splitter transmission outgoing, oppositely incident the second beam splitter, finally, enter receiver from the light beam coupling of the second beam splitter reflection outgoing, complete communication process.
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