CN113363793B - Random laser generation, spectrum synchronization and code sharing method - Google Patents
Random laser generation, spectrum synchronization and code sharing method Download PDFInfo
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Abstract
The invention discloses a random laser generation, spectrum synchronization and code sharing method, which is realized by an optical fiber type disordered microcavity cascade structure, wherein a pulse pumping light source irradiates on a network node in the optical fiber type disordered microcavity cascade structure to generate random laser; the coupling efficiency between adjacent network nodes is adjusted, and random laser spectrum synchronization is realized; and binary coding is carried out on the random laser spectrum, so that different network nodes in spectrum synchronization can synchronously output the same binary code string, and code sharing is realized. The optical fiber type disordered microcavity cascade structure can generate multipoint associated random laser, and the output random laser has narrow spectral line width and wide emission wavelength range and is easy to network and interconnect; the method overcomes the difficult problem that the original random laser system is difficult to interconnect and synchronize, and provides an effective method for the output synchronization of the random radiation system. The spectrum coding and coding sharing based on random laser spectrum synchronization is a method for generating random codes of a physical layer and sharing information.
Description
Technical Field
The invention belongs to the field of optical laser and optical information, and particularly relates to a random laser generation, spectrum synchronization and code sharing method.
Background
Disorder and disorder phenomena inevitably exist in the natural world and artificial environment, and complex optical phenomena such as symmetry destruction, random shock, chaos, strange waves, neuron-like phenomena and the like can be generated by light-light or light-substance interaction in the disorder and disorder systems. The control of these phenomena in complex optical structures has important application prospects in spectroscopy, imaging, sensing, secure communications, neural networks, internet of things, and other applications.
Optical microcavities are an important component of many photonic applications that produce optical modes or lasers with ultra-high quality factors and low threshold powers, however, complex evanescent coupling and harsh phase matching conditions are often required to take advantage of this output. Based on the problems, the amorphous micro-cavity and even the disordered micro-cavity are invented successively, and a superior method is provided for broadband coupling, speckle-free imaging, nonlinear disturbance suppression and the like.
Disordered microcavity output typically has randomness in the spectrum, time domain, etc., i.e., random laser output. On the one hand, this provides more possibilities and broader conditions for the output laser light; on the other hand, more uncertainty is introduced. The coupling and synchronization research among the random lasers provides important reference for understanding, controlling and utilizing a plurality of disordered systems, provides important support for applications such as neural networks and internet of things, and has unique advantages in the aspects of application such as spectral fingerprints and random code generation. However, the current effective methods for achieving and controlling the interaction and synchronization between random lasers are still lacking, especially how to achieve spectral synchronization of random lasers under single-pulse pumping conditions, and the informatics application of such spectral synchronization has not been disclosed.
Therefore, the invention provides random spectrum generation, synchronization and spectrum coding sharing methods for the amorphous microcavity random laser, provides an effective scheme for synchronization and application of the complex system random laser, and provides reference for synchronization of future complex network random events and application of everything interconnection and the like.
Disclosure of Invention
The invention mainly aims to provide a random laser generation, spectrum synchronization and code sharing method to solve the problems of difficult output synchronization between random lasers and information intercommunication between nodes of a complex system.
The method for generating random laser, synchronizing spectrum and sharing codes is realized by the optical fiber type disordered microcavity cascade structure designed by the invention, wherein the optical fiber type disordered microcavity cascade structure comprises a plurality of (at least two) unshaped microcavity gain regions and a plurality of (at least two) coupling waveguide regions, and each unshaped microcavity gain region corresponds to one coupling waveguide region; each unshaped microcavity gain region serves as an independent network node, and each unshaped microcavity gain region can generate random laser of a single network node after being excited by a pulse pumping light source; each coupling waveguide area comprises a multimode fiber and a coupling control device, the multimode fiber is connected with the corresponding amorphous microcavity gain area in a nesting or welding mode, random laser of a single network node generated by the corresponding amorphous microcavity gain area is output, and meanwhile the coupling waveguide area couples the corresponding amorphous microcavity gain area with other amorphous microcavity gain areas serving as independent network nodes.
The coupling waveguide area corresponding to any one independent network node has laser output and coupling functions, the coupling waveguide area adopts a multimode fiber structure, and is connected with a coupling control device through a fiber flange, the coupling control device is an adjustable attenuator, an isolator or a mode scrambler and the like, the coupling waveguide area corresponding to the independent network node is cascaded to the coupling waveguide area corresponding to the next independent network node through the fiber flange, namely, the coupling waveguide area corresponding to any one independent network node has the multimode fiber-coupling control device-multimode fiber structure (after one multimode fiber is connected with the coupling control device through the fiber flange, the other multimode fiber is connected through the fiber flange, and two identical multimode fibers are arranged on two sides of the coupling control device). By adjusting the coupling control device in the coupling waveguide region corresponding to any one independent network node, such as changing the attenuation intensity of the adjustable attenuator, using the isolator to control the power injection direction, etc., the information of the laser coupling intensity, direction, polarization state, transverse mode coupling efficiency, etc. in the multimode fiber structure in the coupling waveguide region corresponding to any one independent network node is changed.
Further, the generation of random laser and the spectrum synchronization are realized by comprehensively regulating and controlling the pulse pumping light source and the coupling condition, wherein the regulation and control of the pulse pumping light source comprises the steps of changing the size of a pumping light spot and changing the size of pumping power; the coupling condition is adjusted and controlled by adjusting the coupling control device, such as changing the attenuation intensity of the adjustable attenuator, controlling the power injection direction by using an isolator, and realizing stable mode distribution by using a mode scrambler.
When a pulse pumping light source irradiates on any amorphous microcavity gain region serving as an independent network node, a laser dye solution in the amorphous microcavity gain region serves as a gain medium to provide light amplification, and a disordered cladding film provides light feedback. Photons are bound in the amorphous microcavity gain region to carry out disorder scattering and are oscillated and amplified in a gain medium to form amplified spontaneous radiation, partial photons can form a closed loop in the amorphous microcavity gain region to form photon localization, light is continuously oscillated and amplified in the amorphous microcavity gain region to generate random laser of the independent network node, and a random laser spectrum is displayed after the random laser is detected by a spectrometer and is a random laser spectrum of a multi-wavelength coherent mechanism.
Each independent network node outputs a random laser spectrum of a multi-wavelength coherent mechanism, and the random laser spectrums of the multi-wavelength coherent mechanism output by the same network node are different under different pulse pump light sources generated by the same pulse pump laser; and under the same pulse pump light source, the random laser spectrums of the multi-wavelength coherent mechanism generated by different network nodes are also different. Since the random laser spectra generated by different network nodes are different, spectrum synchronization is to be achieved. The coupling efficiency between adjacent independent network nodes is adjusted, so that the synchronization of the output random laser spectrums is realized between the adjacent independent network nodes (such as between the network node a and the network node b, or between the network node a and the network node c). For example, adjacent network nodes a and b are connected through respective corresponding coupling waveguide regions, and under the same pulse pumping light source, the network nodes a and b respectively output different random laser spectrums. The coupling efficiency is adjusted by controlling the coupling control devices of the coupling waveguide areas corresponding to the two network nodes a and b, and unidirectional power injection from the network node a to the network node b can be realized if an isolator is added in the coupling waveguide area connected with the network node a; and then adjusting the attenuation intensity of an adjustable attenuator of a coupling waveguide region connected with the network node b, changing the power injection size, inhibiting the initial lasing mode by influencing the population inversion of a gain medium in the network node b, and gradually realizing that the network node b and the network node a have the same lasing mode, namely mode locking, so as to realize the synchronous process of different injection of random laser spectrums output by two different network nodes a and b from different injection modes to the same injection mode.
Further, the random laser spectrum output by any one independent network node is binary coded. The random laser spectrum output by the independent network node is thinned into a multi-bit region according to the equal interval wavelength, the peak value of a longitudinal mode in the random laser spectrum output by the independent network node is defined as 1, and the positions of other non-peak values are defined as 0, so that the random laser spectrum output by the independent network node is converted into multi-bit binary coding information; under different pulse pumping light sources, the same network node outputs different random laser spectrums, namely one random laser spectrum is output by one pulse pumping and corresponds to one binary code string, and multiple pulse pumping outputs multiple binary code strings, so that codes can be continuously generated through continuous excitation of pulse pumping. Under the same pulse pumping light source, the same spectrum is synchronously output by different network nodes by adopting the random laser spectrum synchronization method, the same binary code strings are provided, the code sharing can be realized among the binary code strings, and under the continuous excitation of the pulse pumping, different spectrums which are different from that under the previous pulse pumping are output every time, so that different coded information can be continuously shared; different spectrums are output among unsynchronized network nodes, different binary code strings are provided, and encoding information cannot be shared.
The amorphous microcavity gain region can be replaced by an amorphous microcavity formed on a two-dimensional waveguide plane, and the coupling waveguide region can be replaced by a two-dimensional planar waveguide tangent to the amorphous microcavity. Besides series connection, the connection between the network nodes can be expanded to the complex structures of a star network and a tree network.
Compared with the existing coherent random laser microcavity structure, the optical fiber type disordered microcavity cascade structure provided by the invention can generate random laser with multi-point association, and the output random laser has narrow spectral line width and wide emission wavelength range, and is easy to network and interconnect. The invention overcomes the difficult problem that the original random laser system is difficult to interconnect and synchronize, and provides an effective method for the output synchronization of the random radiation system. The spectrum coding and coding information sharing method based on random laser synchronization utilizes the irrelevance and unpredictability of random laser output spectrum, and is a method for generating random codes of a physical layer and sharing information.
Drawings
FIG. 1 is a schematic diagram of a dual-network node synchronization device of an optical fiber type disordered microcavity cascade structure according to the present invention
FIG. 2 is a schematic diagram of spectra after independent excitation and synchronization of dual network nodes according to the present invention
FIG. 3 is a diagram illustrating the transmission of encoded information after the random spectrum digitization of the present invention
Detailed Description
For the purpose of better illustrating the present invention, the following description will be made in conjunction with the accompanying drawings and examples. 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, the invention discloses a random laser generation, spectrum synchronization and code sharing method, which is realized by adopting an optical fiber type disordered microcavity cascade structure, wherein the optical fiber type disordered microcavity cascade structure mainly comprises at least two unshaped microcavity gain regions and at least two coupling waveguide regions, each unshaped microcavity gain region corresponds to one coupling waveguide region, and each unshaped microcavity gain region comprises a hollow capillary 1, a disordered cladding film 2 and a laser dye solution 3; each coupling waveguide area comprises a multimode optical fiber 4 and a coupling control device 5, the multimode optical fiber 4 comprises a first multimode optical fiber 4 and a second multimode optical fiber 4, the first multimode optical fiber 4 and the second multimode optical fiber 4 are completely the same, and the structure of each coupling waveguide area is that the first multimode optical fiber 4 is connected with the coupling control device 5 through an optical fiber flange plate and then connected with the second multimode optical fiber 4 through the optical fiber flange plate. In addition, the optical fiber type disordered microcavity cascade structure further comprises a pulse pumping laser 6, at least two spectrometers 7, at least two lenses 8 and at least one beam splitter 9, wherein each unshaped microcavity gain region corresponds to one spectrometer 7. Wherein each amorphous microcavity gain region is used as a single network node to be in nested fusion connection with the first multimode optical fiber 4 in the corresponding coupling waveguide region. One end of each amorphous microcavity gain region is connected with the corresponding second multimode fiber 4 in the coupling waveguide region by using a fiber flange plate so as to realize the connection between all network nodes, and the other end of each amorphous microcavity gain region is respectively used for collecting the random laser spectrum by a corresponding spectrometer 7; the connection mode among all network nodes is series connection, star network connection or tree network connection.
Laser emitted by the pulse pump laser 6 is split by a beam splitter 9 and focused by a lens 8 (the laser emitted by the pulse pump laser 6 is split by the beam splitter 9 to form two light beams which are respectively focused by the lens 8 to control and excite two network nodes; more beam splitters 9 are added to control and excite more network nodes) to excite at least two network nodes, so that the excited network nodes output random laser of a multi-wavelength coherence mechanism, the random laser of the multi-wavelength coherence mechanism is detected by a spectrometer 7 corresponding to the corresponding network node to display a random laser spectrum of the multi-wavelength coherence mechanism corresponding to the network node, and meanwhile, each spectrometer 7 can also carry out binary coding on the displayed random laser spectrum of the multi-wavelength coherence mechanism. The multimode fiber 4 is used as a coupling waveguide to couple the spectrum of the random laser of the multi-wavelength coherent mechanism corresponding to the network node to the coupling control device 5 in the coupling waveguide region corresponding to the network node, and the coupling output between the network nodes is controlled by adjusting the coupling control device 5 in the coupling waveguide region corresponding to the network node, such as changing the attenuation intensity of the adjustable attenuator, controlling the power injection direction by using an isolator, and the like, so as to realize the spectrum synchronization of the random laser.
And if the pulse pump laser 6 is required to control and excite one network node at a time, removing the beam splitter 9 in the optical fiber type disordered microcavity cascade structure.
The size of the hollow capillary 1 is 300 mu m in outer diameter and 150 mu m in inner diameter;
the disordered cladding film 2 is made of optical cement and TiO 2 (titanium dioxide) mixed solution is solidified to form optical cement and TiO 2 The refractive indexes of (a) and (b) are 1.4 and 2.1, respectively, and the mass ratio of (b) to (c) is 4:1, the thickness of the formed disordered cladding film 2 is 1 μm to 10 μm.
The multimode fiber 4 is a large-core-diameter step-index multimode fiber, the diameters of a core and a cladding of the multimode fiber 4 are respectively 105 μm and 125 μm, the length of the core and the cladding of the multimode fiber 4 is 20cm, and the multimode fiber is used for transmitting random laser of a multi-wavelength coherent mechanism output by the amorphous microcavity gain region and coupling the random laser of the multi-wavelength coherent mechanism into a next network node.
The pulse pump laser 6 is yttrium aluminum garnet (Nd: YAG) laser with wavelength of 532nm, repetition frequency of 1Hz, pulse width of 6ns, and energy density of 1.5mJ/cm 2 。
The preparation method of the unshaped microcavity gain region and the coupling waveguide region in the optical fiber type disordered microcavity cascade structure comprises the following steps:
step 1: mixing optical cement with TiO 2 The weight ratio of the components is 4: the mixed solution of 1 is filled into the hollow capillary tube 1 through an injector, and then the hollow capillary tube 1 is drawn back to the injector, the residual solution forms a layer of uniform cladding film on the capillary tube wall, air is injected into the hollow capillary tube 1 through an air pump and the flow rate is controlled, rough cladding distribution with uneven thickness is generated in an erosion mode, then ultraviolet light is used for solidification to form a disordered cladding film 2, and a laser dye solution 3 is filled into the hollow capillary tube 1 of which the inner wall forms the disordered cladding film 2 and then is used as an unshaped microcavity gain area of the optical fiber type disordered microcavity cascade structure to form a single network node. The next network node is formed in the same way.
Step 2: fixing a cut-flat multimode optical fiber 4 on a three-dimensional displacement platform, moving the multimode optical fiber 4 in the x-y-z direction by rotating a knob on the three-dimensional displacement platform, nesting the cut-flat multimode optical fiber 4 into the inner diameter of a hollow capillary 1 of a single network node, sealing the connection position by spin coating with optical cement, connecting a coupling control device 5 through an optical fiber flange plate, and then connecting another multimode optical fiber 4 through the optical fiber flange plate to serve as a coupling waveguide area corresponding to the single network node. Manufacturing a coupling waveguide area corresponding to the next network node by the same method; and connecting the other multimode optical fiber 4 in the coupling waveguide region corresponding to each network node through an optical fiber flange plate, thereby realizing the connection of each network node.
In embodiments of the present invention the coupling control device 5 may be an adjustable attenuator, isolator or mode scrambler to control the coupling strength and the direction of power injection, the overall optical path being as shown in fig. 1.
Taking an optical fiber type disordered microcavity cascade structure containing double network nodes as an example, laser emitted by a pulse pumping laser 6 is split by a beam splitter 9 to form two beams of laser, the two beams of laser are respectively focused by a lens 8 and then respectively irradiate on two amorphous microcavity gain regions, one ends of the two amorphous microcavity gain regions are connected with second multimode fibers in two corresponding coupling waveguide regions by an optical fiber flange, the two corresponding coupling waveguide regions are connected to realize the connection of the two amorphous microcavity gain regions, and the other ends of the two amorphous microcavity gain regions are respectively collected by two corresponding spectrometers 7 for random laser spectra.
When laser emitted by the pulse pump laser 6 in fig. 1 is focused by the lens 8 and irradiates any amorphous microcavity gain region serving as an independent network node, a laser dye solution in the amorphous microcavity gain region serves as a gain medium to provide light amplification, and the disordered cladding film provides light feedback. Part of photons can form a closed loop in the amorphous microcavity gain region to form photon localization, so that light is continuously oscillated and amplified in the amorphous microcavity gain region, the amorphous microcavity gain region outputs random laser of a multi-wavelength coherent mechanism, the random laser of the multi-wavelength coherent mechanism is detected by a spectrometer 7 corresponding to the amorphous microcavity gain region, a random laser spectrum of the multi-wavelength coherent mechanism is displayed, and the generation of the random laser is realized.
In the first embodiment, the pulsed pump laser 6 used was a yttrium aluminum garnet (Nd: YAG) laser with a wavelength of 532nm, a repetition rate of 1Hz, a pulse width of 6ns, and an energy density of 1.5mJ/cm 2 Laser emitted by the pulse pump laser 6 is equally divided into two laser beams by the beam splitter 9, the two laser beams are focused by a lens 8 and then respectively irradiate on two amorphous microcavity gain regions, and the structure diagram is shown in fig. 1. The two amorphous microcavity gain regions serve as two network nodes a and b, and random laser spectrums of different multi-wavelength coherent mechanisms output by the network nodes a and b are collected by a spectrometer 7 corresponding to each network node. The coupling control device in the coupling waveguide area of the network node a is an isolator, the coupling control device in the coupling waveguide area of the network node b is an adjustable attenuator, and the isolator in the coupling waveguide area of the network node a can realize unidirectional power injection from the network node a to the network node b; and then adjusting the attenuation intensity of an adjustable attenuator of a coupling waveguide region connected with the network node b, changing the power injection size, and inhibiting the initial lasing mode of the gain medium by influencing the population inversion of the gain medium in the network node b, so that the injection synchronization process of the random laser spectrums of the multi-wavelength coherent mechanism output by two different network nodes a and b from different to the same is realized, namely the random laser spectrum synchronization is realized.
The experimental effect of the random laser spectrum synchronization method of the invention is shown in fig. 2, the realized single-pulse pumping output random laser spectrum is given in 10, it can be seen that the random laser spectra of the multi-wavelength coherent mechanism output by the two network nodes a and b have good similarity, the correlation coefficient is 0.93 (the correlation coefficient value is between 0 and 1, the closer to 1, the higher the synchronization effect is), and the random laser spectrum synchronization of the single-pulse pumping multi-wavelength coherent mechanism is realized. For comparison, 11 shows that two network nodes do not reach the synchronization condition, the correlation of the corresponding two random laser spectrums is low, the correlation coefficient is 0.36, and the outputs are not synchronized.
Implementing random laserThe experimental environment shown in FIG. 1 was used for code sharing, when the energy density of the pulse pump laser 6 was 1.5mJ/cm 2 When the emitted laser is divided into two beams by the beam splitter 9 and then respectively irradiates the network nodes a and b after being focused by the lens 8, the network nodes a and b respectively generate random lasers of a multi-wavelength coherent mechanism, and the spectrometers 7 corresponding to the network nodes a and b respectively detect the random laser spectrums of the multi-wavelength coherent mechanism of the network nodes a and b. The range from 570nm to 585nm of the random laser spectrum of the multi-wavelength coherent mechanism of the network node a is equally divided into 15 wavelength small ranges of 1nm, and 15 bits are represented. When the peak value of the laser exists in each wavelength cell, the corresponding bit is defined as 1, and when the peak value does not exist, the corresponding bit is defined as 0. The network node a transmits the coding information to other nodes in the process of realizing random laser spectrum synchronization by coupling the waveguide area with other nodes (b nodes are even more), and the coding sharing process of a plurality of nodes is realized.
In one second embodiment using random laser synchronous spectral encoding, as shown in FIG. 3, the present invention utilizes 3 consecutive single-pulse pumps generated by a pulse pump laser 6, with energy densities of 1.5mJ/cm 2 3 sets of synchronized random laser spectra 12, 13 and 14 are obtained by two spectrometers 7, each set of spectra including a random laser spectrum of a multi-wavelength coherent regime output by each of two network nodes a and b under single pulse pumping, the outputs of the two network nodes a and b having a high correlation, indicating that the two are synchronized. And 3 groups of different coding sequences are generated by coding the three groups of synchronous spectrums, and meanwhile, two synchronous network nodes a and b in each group have the same coding result. The spectrum-based code generation and code information sharing can be realized by utilizing single-pulse synchronization between network nodes. The purpose of generating 3 consecutive single-pulse pumps is to give 3 simple examples of coding, one pulse pump corresponding to one random coding generation and delivery process.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (7)
1. A random laser generation, spectrum synchronization and coding sharing method is characterized in that the method is realized through an optical fiber disordered microcavity cascade structure, the optical fiber disordered microcavity cascade structure mainly comprises n unshaped microcavity gain regions, n coupling waveguide regions, a pulse pump laser (6), n spectrometers (7), n lenses (8) and at least one beam splitter (9), and each unshaped microcavity gain region serving as a network node corresponds to one coupling waveguide region and one spectrometer (7); each unshaped microcavity gain region comprises a hollow capillary tube (1), a disordered cladding film (2) and a laser dye solution (3); each coupling waveguide area comprises a multimode optical fiber (4) and a coupling control device (5), and the structure of each coupling waveguide area is that after the first multimode optical fiber is connected with the coupling control device (5) through an optical fiber flange plate, the first multimode optical fiber is connected with the second multimode optical fiber through the optical fiber flange plate; each unshaped microcavity gain region is nested and welded with the first multimode optical fiber in the corresponding coupling waveguide region; one end of each of the n amorphous microcavity gain regions is connected with the second multimode fiber in the n corresponding coupling waveguide regions by using a fiber flange to realize the connection of n network nodes, and the other ends of the n amorphous microcavity gain regions are respectively used for collecting random laser spectrums through n corresponding spectrometers (7); the multimode optical fiber comprises a first multimode optical fiber and a second multimode optical fiber, and the first multimode optical fiber and the second multimode optical fiber are completely the same; the connection mode of the n network nodes is series connection, star network connection or tree network connection, n is more than or equal to 2 and is an integer;
laser emitted by a pulse pump laser (6) is split by at least one beam splitter (9) to form at least two light beams, each light beam is focused by a corresponding lens (8) and then irradiates on an unshaped microcavity gain region to excite an unshaped microcavity gain region serving as a network node, a laser dye solution (3) in the excited unshaped microcavity gain region serves as a gain medium to provide light amplification, a disordered cladding film (2) provides light feedback, part of photons form a closed loop in the excited unshaped microcavity gain region to form photon localization, so that light is continuously oscillated and amplified in the excited unshaped microcavity gain region, the excited network node outputs random laser of a multi-wavelength coherent mechanism, the random laser of the multi-wavelength coherent mechanism is detected by a spectrometer (7) corresponding to the corresponding network node, the random laser spectrum of the multi-wavelength coherent mechanism of the corresponding network node is displayed, and the generation of the random laser is realized;
the multimode fiber (4) is used as a coupling waveguide to couple the random laser spectrum of a multi-wavelength coherent mechanism corresponding to the network node into a coupling control device (5) in a coupling waveguide area corresponding to the network node, and the coupling output between adjacent network nodes is controlled by respectively adjusting the coupling control devices (5) in the coupling waveguide areas corresponding to the network node and the adjacent network nodes, so that the spectrum synchronization of random laser between the adjacent network nodes is realized;
binary coding is carried out on a random laser spectrum of a multi-wavelength coherent mechanism of any network node in the spectrum synchronization of random lasers by adopting a spectrometer (7) corresponding to the network node, the random laser spectrum of the multi-wavelength coherent mechanism output by the network node is thinned into a multi-bit region according to the equal interval wavelength, the peak value of a longitudinal mode in the random laser spectrum of the multi-wavelength coherent mechanism output by the network node is defined as 1, and the positions of other non-peak values are defined as 0, so that the random laser spectrum of the multi-wavelength coherent mechanism output by the network node is converted into multi-bit binary coding information; in the spectrum synchronization process of the random laser, different network nodes synchronously output the same random laser spectrum of the multi-wavelength coherent mechanism, so that the random laser spectrum has the same binary coding information and realizes coding sharing.
2. The random laser generation, spectral synchronization and code sharing method according to claim 1, characterized in that the hollow-core capillary (1) has dimensions of 300 μm outer diameter and 150 μm inner diameter.
3. The method of claim 2, characterized in that it comprises a random laser generation, spectral synchronization and code sharing methodCharacterized in that the disordered cladding film (2) is composed of optical cement and TiO 2 Is cured to form the optical cement and the TiO 2 The refractive indexes of (a) and (b) are 1.4 and 2.1, respectively, and the mass ratio of (b) to (c) is 4:1, the thickness of the formed disordered cladding film (2) is 1 μm to 10 μm.
4. The random laser generation, spectrum synchronization and code sharing method according to claim 3, wherein the multimode fiber (4) is a large core step-index multimode fiber, and the core and cladding diameters of the multimode fiber (4) are respectively 105 μm and 125 μm; the length of the multimode optical fiber (4) is 20cm.
5. Method for random laser generation, spectral synchronization and code sharing according to claim 4, characterized in that the coupling control device (5) is an adjustable attenuator, isolator or mode scrambler.
6. Method for random laser generation, spectral synchronization and code sharing according to claim 5, characterized in that the pulsed pump laser (6) is a yttrium aluminum garnet laser with a wavelength of 532nm, a repetition frequency of 1Hz, a pulse width of 6ns and an energy density of 1.5mJ/cm 2 。
7. The random laser generation, spectrum synchronization and code sharing method of claim 6, wherein the preparation method of the amorphous microcavity gain region and the coupling waveguide region in the fiber-type disordered microcavity cascade structure comprises:
step 1: mixing optical cement with TiO 2 The weight ratio of the components is 4:1, filling the hollow capillary tube (1) with the mixed solution through an injector, drawing the mixed solution back to the injector, forming a layer of uniform cladding film on the wall of the capillary tube by the residual solution, injecting air into the hollow capillary tube (1) by an air pump and controlling the flow rate, generating rough cladding distribution with uneven thickness in an erosion mode, curing by ultraviolet light to form a disordered cladding film (2), filling the hollow capillary tube (1) with the disordered cladding film (2) formed on the inner wall with a laser dye solution (3) to form the optical fiber type non-optical fiber typeAn unshaped microcavity gain region of the sequential microcavity cascade structure forms a network node; forming the rest n-1 network nodes by the same method;
step 2: fixing a cut-flat multimode optical fiber (4) on a three-dimensional displacement table, moving the multimode optical fiber (4) in the x-y-z direction by rotating a knob on the three-dimensional displacement table, nesting the cut-flat multimode optical fiber (4) into the inner diameter of a hollow capillary tube (1) of a network node, sealing the connection part by spin coating with optical cement, connecting a coupling control device (5) through an optical fiber flange, and then connecting another multimode optical fiber through the optical fiber flange as a coupling waveguide region corresponding to the network node; manufacturing coupling waveguide areas corresponding to the remaining n-1 network nodes by the same method; and connecting another multimode fiber in the coupling waveguide region corresponding to the n network nodes through the fiber flange plate, thereby realizing the connection of the n network nodes.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104461456A (en) * | 2014-12-29 | 2015-03-25 | 太原理工大学 | Tbps all-optical parallel true random number producing method having ultra-strong scalability |
| CN104618028A (en) * | 2015-01-23 | 2015-05-13 | 国网四川省电力公司信息通信公司 | Device and method for generating spectral amplitude code marks based on tunable optic filter |
| CN105428990A (en) * | 2015-12-15 | 2016-03-23 | 电子科技大学 | Certainty soliton mode locking method for Kerr optical frequency comb in optical microcavity |
| CN111192197A (en) * | 2019-12-26 | 2020-05-22 | 西安电子科技大学 | Medium wave infrared multispectral imaging method and device based on vortex light source wavelength conversion |
| AU2020103000A4 (en) * | 2020-10-24 | 2020-12-24 | Mishra, Nikhlesh Kumar DR | A system and a method for high speed multimode data transmission for short haul communication |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111162437A (en) * | 2020-02-17 | 2020-05-15 | 北京工业大学 | Random laser |
-
2021
- 2021-05-17 CN CN202110532388.XA patent/CN113363793B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104461456A (en) * | 2014-12-29 | 2015-03-25 | 太原理工大学 | Tbps all-optical parallel true random number producing method having ultra-strong scalability |
| CN104618028A (en) * | 2015-01-23 | 2015-05-13 | 国网四川省电力公司信息通信公司 | Device and method for generating spectral amplitude code marks based on tunable optic filter |
| CN105428990A (en) * | 2015-12-15 | 2016-03-23 | 电子科技大学 | Certainty soliton mode locking method for Kerr optical frequency comb in optical microcavity |
| CN111192197A (en) * | 2019-12-26 | 2020-05-22 | 西安电子科技大学 | Medium wave infrared multispectral imaging method and device based on vortex light source wavelength conversion |
| AU2020103000A4 (en) * | 2020-10-24 | 2020-12-24 | Mishra, Nikhlesh Kumar DR | A system and a method for high speed multimode data transmission for short haul communication |
Non-Patent Citations (4)
| Title |
|---|
| Controlled Assembly of Upconverting Nanoparticles for Low-Threshold Microlasers and Their Imaging in Scattering Media;Liu, YW;《 ACS NANO》;20200228;全文 * |
| Experimental and Theoretical Investigation of the Polymer Optical Fiber Random Laser with Resonant Feedback;He, JJ;《ADVANCED OPTICAL MATERIALS》;20180405;全文 * |
| 光波导结构中无序包层微腔随机激光特性研究;杨兆基;《中国优秀硕士学位论文全文数据库》;20180215;全文 * |
| 极弱散射结构中的随机激光器;刘大禾;《光学学报》;20110910;全文 * |
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