CN111900604B - Hectowatt chaotic laser source device based on random fiber laser - Google Patents
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- 239000000835 fiber Substances 0.000 title claims abstract description 140
- 230000000739 chaotic effect Effects 0.000 title claims abstract description 56
- 230000003287 optical effect Effects 0.000 claims abstract description 40
- 238000001069 Raman spectroscopy Methods 0.000 claims abstract description 32
- 238000005086 pumping Methods 0.000 claims abstract description 4
- 238000002310 reflectometry Methods 0.000 claims description 8
- 230000009471 action Effects 0.000 claims description 2
- 230000002238 attenuated effect Effects 0.000 claims 1
- 239000013307 optical fiber Substances 0.000 description 7
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 229910052691 Erbium Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- -1 erbium ions Chemical class 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
- H01S3/094042—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a fibre laser
- H01S3/094046—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a fibre laser of a Raman fibre laser
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/0675—Resonators including a grating structure, e.g. distributed Bragg reflectors [DBR] or distributed feedback [DFB] fibre lasers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06754—Fibre amplifiers
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Abstract
The invention belongs to the technical field of chaotic laser, and discloses a hectowatt chaotic laser source device based on a random fiber laser, which comprises a DFB laser, an optical attenuator, a first fiber Bragg grating, a Raman laser, a 2 multiplied by 1 optical coupler, a single mode fiber and a second fiber Bragg grating; laser output by the DFB laser sequentially passes through the optical attenuator and the first fiber Bragg grating and then enters the single-mode fiber from the first input end of the x optical coupler; the Raman laser is used for outputting pump light in hundred watt level; pumping light output by the Raman laser enters the single-mode fiber through the second input end of the 2 multiplied by 1 optical coupler, and the other end of the single-mode fiber is connected with the second fiber Bragg grating; the chaotic laser light source device can generate chaotic laser with higher complexity and power up to the hundred watt level.
Description
Technical Field
The invention belongs to the technical field of chaotic laser, and particularly relates to a hectowatt chaotic laser source device based on a random fiber laser.
Background
The chaotic laser has wide spectrum characteristic similar to noise and extremely high concealment, and is widely applied to aspects of secret communication, laser ranging, random number generation, optical fiber network fault detection and the like. However, the output power is generally very small, only in the order of milliwatts, which greatly limits the application. At present, the most common device for amplifying the chaotic laser light source is an erbium-doped fiber amplifier (EDFA), the output power is 10 mW-20W, but due to the effect of gain saturation of erbium ions, the chaotic light signal is difficult to be further amplified (patent No. CN 201720578585.4). And the amplified spontaneous emission of the EDFA can affect the improvement of the signal-to-noise ratio of the output signal light. The random fiber laser has the advantages of simple structure, high signal-to-noise ratio and high output power. Research based on high-power random fiber lasers shows that the output power of random fiber lasers reaches hundreds of watts.
Therefore, there is a need for an improved chaotic laser source device in the prior art to obtain a chaotic laser source with high power output.
Disclosure of Invention
In order to solve the problems that the output power of a chaotic laser is small and the application field of the chaotic laser is limited in the prior art, the chaotic laser overcomes the defects in the prior art, and the technical problems to be solved are as follows: a hectowatt chaotic laser source device based on a random fiber laser is provided.
In order to solve the technical problems, the invention adopts the technical scheme that: a hectowatt chaotic laser source device based on a random fiber laser comprises a DFB laser, an optical attenuator, a first fiber Bragg grating, a Raman laser, a 2 x 1 optical coupler, a single-mode fiber and a second fiber Bragg grating;
laser output by the DFB laser sequentially passes through the optical attenuator and the first fiber Bragg grating and then enters the single-mode fiber from the first input end of the 2 x 1 optical coupler; the Raman laser is used for outputting pump light with hundred watt level; the pumping light output by the Raman laser enters the single-mode fiber through the second input end of the 2 x 1 optical coupler, and the other end of the single-mode fiber is connected with the second fiber Bragg grating;
the first fiber Bragg grating is used for reflecting light output by the DFB laser back to the DFB laser to enable the DFB laser to generate chaotic laser output, the Raman laser, the 2 x 1 optical coupler, the single-mode fiber and the second fiber Bragg grating form a random fiber laser, and the random fiber laser is used for amplifying the chaotic laser in the single-mode fiber under the action of pump light and outputting the random laser to be injected back into the DFB laser to enable the random laser to generate disturbance chaos; and after the residual pump laser and the amplified chaotic laser are incident to the second fiber Bragg grating, the residual pump light is reflected back to the single-mode fiber by the second fiber Bragg grating, and the amplified chaotic laser is output after passing through the second fiber Bragg grating.
And the optical attenuator unidirectional optical attenuator is used for attenuating the laser output by the first fiber Bragg grating and outputting the laser to the DFB laser.
The central wavelength of the Raman laser is 90-110 nm smaller than that of the DFB laser, and the length of the single-mode optical fiber is 14-16 km.
The central wavelength of the Raman laser is 100nm shorter than that of the DFB laser, and the length of the single-mode optical fiber is 15 km.
The central wavelength of the first fiber Bragg grating is the same as that of the DFB laser, and the reflectivity of one side, close to the DFB laser, of the first fiber Bragg grating is 20%; the central wavelength of the second fiber Bragg grating is the same as the output laser wavelength of the Raman laser, and the reflectivity of one side close to the single-mode fiber is 95%.
The center wavelength of the DFB laser is 1550nm, the center wavelength of the Raman laser is 1450nm, the length of the single-mode fiber is 15km, the center reflection wavelength of the second Bragg fiber grating is 1450nm, and the center reflection wavelength of the second Bragg fiber grating is 1450 nm.
Compared with the prior art, the invention has the following beneficial effects: the invention provides a hectowatt chaotic laser source device based on a random fiber laser, which is based on the principle of the random fiber laser, utilizes the characteristic of high output power of the random fiber laser, and utilizes the structure of the random fiber laser to effectively amplify light of chaotic light to obtain a hectowatt chaotic light source; in addition, on one hand, the light output by the DFB laser reaches the part of the random fiber laser with the dotted frame, and part of the light is reflected back to the DFB laser by the first fiber Bragg grating; on the other hand, part of the random laser light generated by the random fiber laser is output from the 2 × 1 optical coupler and injected into the DFB laser. The optical hybrid disturbance DFB laser in the two processes generates chaotic laser with higher complexity, so that the chaotic laser source device can generate chaotic laser with higher complexity and hundreds of watts of power.
Drawings
Fig. 1 is a schematic structural diagram of a hectowatt chaotic laser source device based on a random fiber laser according to an embodiment of the present invention;
in the figure: 1-DFB laser, 2-optical attenuator, 3-first fiber Bragg grating, 4-Raman laser, 5-2 × 1 optical coupler, 6-single mode fiber, and 7-second fiber Bragg grating.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments; all other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, an embodiment of the present invention provides a hectowatt chaotic laser source device based on a random fiber laser, including a DFB laser 1, an optical attenuator 2, a first fiber bragg grating 3, a raman laser 4, a 2 × 1 optical coupler 5, a single-mode fiber 6, and a second fiber bragg grating 7; laser output by the DFB laser 1 sequentially passes through the optical attenuator 2 and the first fiber Bragg grating 3 and then enters the single-mode fiber 6 from the first input end of the 2 x 1 optical coupler 5; the Raman laser 4 is used for outputting pump light with hundreds of watts; the pumping light output by the raman laser 4 enters a single-mode fiber 6 through a second input end of the 2 × 1 optical coupler 5, and the other end of the single-mode fiber 6 is connected with a second fiber bragg grating 7; the first fiber Bragg grating 7 is used for reflecting light output by the DFB laser 1 back to the DFB laser 1 to enable the DFB laser 1 to generate chaotic laser output, the Raman laser 4, the 2 x 1 optical coupler 5, the single-mode fiber 6 and the second fiber Bragg grating 7 form a random fiber laser which is used for amplifying the chaotic laser in the single-mode fiber, and in addition, the random laser generated in the random fiber laser is injected into the DFB laser to generate disturbance chaos after returning to the attenuator 2 through the first fiber Bragg grating 3; after the randomly amplified residual pump light and the amplified chaotic laser are incident to the second fiber Bragg grating 7, the residual pump light is reflected back to the single-mode fiber 6 by the second fiber Bragg grating 7, and the amplified chaotic laser is output after passing through the second fiber Bragg grating 7.
Specifically, in the present embodiment, only milliwatt-level laser light output from the DFB laser 1 passes through the optical attenuator 2 and is incident on the first fiber bragg grating 3 and the random fiber laser. Preferably, the optical attenuator 2 is a unidirectional optical attenuator, and is configured to attenuate the laser output from the random fiber laser and returned to the DFB laser 1 through the first fiber bragg grating 3, but not attenuate the laser output from the DFB laser, that is, part of the random laser generated by the random fiber laser in the dashed line frame of fig. 1 may also pass through the first fiber bragg grating 3 and the optical attenuator 2 and then be injected into the DFB laser 1, and the light reflected by the first fiber bragg grating 3 and the injected random laser may be mixed to disturb the DFB laser 1, so that the DFB laser 1 generates chaotic laser with higher complexity.
Specifically, in this embodiment, the central wavelength of the raman laser 1 is smaller than the central wavelength of the DFB laser 1 by 90 to 110nm, and the length of the single-mode fiber 6 is 14 to 16 km. Preferably, the central wavelength of the raman laser 1 is 100nm shorter than that of the DFB laser 1, and the length of the single mode fiber 6 is 15 km.
Further, in this embodiment, the central wavelength of the first fiber bragg grating 3 is the same as the central wavelength of the DFB laser 1, and the reflectivity of the side close to the DFB laser 1 is 20%; the central wavelength of the second fiber bragg grating 7 is the same as the output laser wavelength of the raman laser 4, and the reflectivity of the side close to the single-mode fiber 6 is 95%.
According to the stimulated raman scattering theory, the following relationship is given:
wherein,E（ω p ，z）, E（ω s ，z) Respectively represent the intensity of the output light of the raman laser 3 (pump light intensity) and the difference between the intensities of the pump light output by the raman laser 3 and the seed light 1 (i.e., stokes light intensity);ω p ，ω s respectively representing a pump light frequency and a stokes light frequency;n p ，n s respectively representing the refractive index corresponding to the pump light and the refractive index corresponding to the Stokes light;zrepresenting the length of the optical fiber;χ（ω s ) Represents the polarizability; λ represents a wavelength; g represents a gain; i represents an imaginary number; the real part of the equation reflects the phase change and the imaginary part reflects the intensity change.
Represents a dielectric constant: c represents the speed of light;
represents a frequency width of the optical wave;
represents the frequency of the light;
indicating the wavelength width of the light wave. Simultaneous calculation formulas (1) to (5) give: the central wavelength of the Raman laser 3 is 100nm smaller than that of the seed light as the optimal solution;
according to the theory of light propagation in optical fibers, there are:
wherein,P（z) Representing the variation of optical power along the fiber;P 0 represents the power of the input fiber;α p represents the attenuation of the optical power of the input optical fiber;zindicating the length of the optical fibre；αRepresenting the attenuation caused by the entire fiber. Simultaneous (4), (b), (c), (d)6) And (7), considering the final realization of outputting hectowatt-level chaotic light, calculating to obtain: the length of the single-mode fiber 6 is z =15 km.
The following are specific examples:
the center wavelength of the DFB laser 1 is 1550nm, the center wavelength of the first fiber Bragg grating 3 is 1550nm, the left reflectivity is 20%, the center wavelength of the Raman laser 4 is 1450nm, the length of the single-mode fiber 5 is 15km, the center wavelength of the second fiber Bragg grating 7 is 1450nm, and the left reflectivity is 95%.
On one hand, the light output by the DFB laser 1 with the central wavelength of 1550nm reaches the broken line frame random fiber laser part, wherein 20% of the light is reflected by the first fiber Bragg grating 3 back to the DFB laser 1 with the central wavelength of 1550 nm; on the other hand, part of the random laser light generated by the random fiber laser in the dotted line frame is output from the left side to be injected into the DFB laser 1 having a center wavelength of 1550 nm. Therefore, the DFB laser 1 with the central wavelength of 1550nm disturbed by the optical mixing of the two processes generates chaotic laser with higher complexity. When 80% of chaotic laser generated by the DFB laser 1 with the central wavelength of 1550nm reaches the random fiber laser in the broken line frame through the first fiber Bragg grating 3 with the central wavelength of 1550nm, the chaotic laser is amplified by the random fiber laser, and therefore hectowatt chaotic laser is achieved.
In summary, the present invention provides a hectowatt chaotic laser source device based on a random fiber laser, which is based on the principle of the random fiber laser, utilizes the characteristic of high output power of the random fiber laser, and utilizes the structure of the random fiber laser to effectively amplify the chaotic light, so as to obtain a hectowatt chaotic light source. In addition, on one hand, the light output by the DFB laser reaches the part of the random fiber laser with the dotted frame, and part of the light is reflected back to the DFB laser by the first fiber Bragg grating; on the other hand, part of the random laser light generated by the random fiber laser is output from the 2 × 1 optical coupler and injected into the DFB laser. The optical hybrid disturbance DFB laser in the two processes generates chaotic laser with higher complexity, so that the chaotic laser source device can generate chaotic laser with higher complexity and hundreds of watts of power.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (6)
1. A hectowatt chaotic laser source device based on a random fiber laser is characterized by comprising a DFB laser (1), an optical attenuator (2), a first fiber Bragg grating (3), a Raman laser (4), a 2 x 1 optical coupler (5), a single-mode fiber (6) and a second fiber Bragg grating (7);
laser output by the DFB laser (1) sequentially passes through the optical attenuator (2) and the first fiber Bragg grating (3) and then enters the single-mode fiber (6) from the first input end of the 2 x 1 optical coupler (5); the Raman laser (4) is used for outputting pump light in hundred watt level; the pumping light output by the Raman laser (4) enters a single-mode fiber (6) through a second input end of the 2 x 1 optical coupler (5), and the other end of the single-mode fiber (6) is connected with a second fiber Bragg grating (7);
the first fiber Bragg grating (3) is used for reflecting light output by the DFB laser (1) back to the DFB laser (1) to enable the DFB laser to generate chaotic laser output, the Raman laser (4), the 2 x 1 optical coupler (5), the single-mode fiber (6) and the second fiber Bragg grating (7) form a random fiber laser, and the random fiber laser is used for amplifying chaotic laser in the single-mode fiber under the action of pump light and outputting random laser to return and inject the random laser into the DFB laser (1) to enable the random laser to generate disturbance chaos; after the residual pump laser and the amplified chaotic laser are incident to the second fiber Bragg grating (7), the residual pump light is reflected back to the single-mode fiber (6) by the second fiber Bragg grating (7), and the amplified chaotic laser is output after passing through the second fiber Bragg grating (7);
the central wavelength of the first fiber Bragg grating (3) is the same as that of the DFB laser (1), and the central wavelength of the second fiber Bragg grating (7) is the same as that of the output laser wavelength of the Raman laser (4).
2. The hectowatt chaotic laser source device based on random fiber laser as claimed in claim 1, wherein the optical attenuator (2) is a one-way optical attenuator for attenuating the laser output from the first fiber bragg grating (3) and outputting the attenuated laser to the DFB laser (1).
3. The hectowatt chaotic laser source device based on the random fiber laser as claimed in claim 1, wherein the central wavelength of the Raman laser (1) is 90-110 nm smaller than that of the DFB laser (1), and the length of the single mode fiber (6) is 14-16 km.
4. The hectowatt chaotic laser source device based on random fiber laser as claimed in claim 1, wherein the central wavelength of the Raman laser (1) is 100nm shorter than that of the DFB laser (1), and the length of the single mode fiber (6) is 15 km.
5. The hectowatt chaotic laser source device based on the random fiber laser as claimed in claim 1, wherein the reflectivity of the first fiber bragg grating (3) on the side close to the DFB laser (1) is 20%; the reflectivity of the side, close to the single-mode fiber (6), of the second fiber Bragg grating (7) is 95%.
6. The hectowatt chaotic laser source device based on the random fiber laser as claimed in claim 1, wherein the center wavelength of the DFB laser (1) is 1550nm, the center wavelength of the Raman laser (3) is 1450nm, and the length of the single-mode fiber (6) is 15 km.
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| CN118508215A (en) * | 2024-04-29 | 2024-08-16 | 太原理工大学 | Preparation method of hyperchaotic light source applied to communication wave band |
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