CN111900601A - High-power tunable chaotic laser light source device - Google Patents
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- CN111900601A CN111900601A CN202010680575.8A CN202010680575A CN111900601A CN 111900601 A CN111900601 A CN 111900601A CN 202010680575 A CN202010680575 A CN 202010680575A CN 111900601 A CN111900601 A CN 111900601A
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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
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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
- H01S3/0632—Thin film lasers in which light propagates in the plane of the thin film
- H01S3/0635—Thin film lasers in which light propagates in the plane of the thin film provided with a periodic structure, e.g. using distributed feed-back, grating couplers
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Abstract
The invention belongs to the technical field of chaotic laser, and discloses a high-power tunable chaotic laser light source device, which comprises a tunable DBR laser, an optical attenuator, a tunable laser, a first optical coupler, a single-mode optical fiber, a fiber Bragg grating, a second optical coupler and a broadband dielectric film reflecting mirror, wherein the tunable DBR laser is connected with the optical attenuator through the first optical coupler; the tunable DBR laser is connected with one end of an optical attenuator, the other end of the optical attenuator is connected with a first port of a first optical coupler, the tunable laser is connected with a second port of the first optical coupler, a common port of the first optical coupler is connected with a common port of a second optical coupler after being sequentially connected with a single-mode optical fiber and an optical fiber Bragg grating, a first port of the second optical coupler is connected with a broadband dielectric film reflecting mirror, and the second port is used for outputting amplified chaotic laser; the invention can realize the output of the hundred watt-level high-power tunable chaotic laser, and has the advantages of large tunable range, good time domain stability and good light beam quality.
Description
Technical Field
The invention belongs to the field of chaotic laser, and particularly relates to a high-power tunable chaotic laser light source device.
Background
The chaotic laser has wide spectrum characteristic similar to noise and extremely high concealment, and is widely applied to the fields of secret communication, high-speed random number generation, laser ranging, optical fiber network fault detection and the like. But the output power is generally very small, only in the milliwatt order, which greatly limits the application development. At present, an erbium-doped fiber amplifier (EDFA) is the most common chaotic laser amplification device, can amplify signal light with a bandwidth of 30nm, and has output power of 10 mW-20W. However, due to the effect of erbium ion gain saturation, it is difficult to further amplify the chaotic light signal (patent No. CN 201720578585.4), and the amplified spontaneous emission of EDFA affects the signal-to-noise ratio of the output signal light. In addition, in chaotic secure communication, it is desirable that the center wavelength of the chaotic carrier is tunable in a wide range, however, the center wavelength of the chaotic laser can only be adjusted in a small range due to the limitations of gain size and bandwidth.
The random fiber laser has the advantages of high output power, high signal-to-noise ratio and simple structure, and can be widely applied to the fields of fiber sensing, earth and environment science, medical treatment, life science and the like. Research based on high-power random fiber lasers shows that the output power of random fiber lasers reaches hundreds of watts.
Based on this, if the random laser can be applied to the field of chaotic lasers, the output of the high-power chaotic laser with hundred watt level is realized, and the application range of the chaotic laser can be greatly expanded.
Disclosure of Invention
The invention overcomes the defects of the prior art, and solves the technical problems that: a high-power tunable chaotic laser light source device is provided.
In order to solve the technical problems, the invention adopts the technical scheme that: a high-power tunable chaotic laser source device comprises a tunable DBR laser, an optical attenuator, a tunable laser, a first optical coupler, a single-mode optical fiber, a fiber Bragg grating, a second optical coupler and a broadband dielectric film reflecting mirror;
the tunable DBR laser is connected with one end of an optical attenuator, the other end of the optical attenuator is connected with a first port of a first optical coupler, the tunable laser is connected with a second port of the first optical coupler, a common port of the first optical coupler is connected with a common port of a second optical coupler after being sequentially connected with a single-mode optical fiber and an optical fiber Bragg grating, a first port of the second optical coupler is connected with a broadband dielectric film reflecting mirror, and the second port is used for outputting amplified chaotic laser;
laser output by the tunable DBR laser enters a single-mode optical fiber through an optical attenuator and a first optical coupler; the hectowatt-level pump light output by the tunable laser enters the single-mode fiber after passing through the first optical coupler, and the tunable laser, the first optical coupler, the single-mode fiber, the fiber Bragg grating and the broadband dielectric film reflecting mirror form a random fiber laser; the broadband dielectric film reflector is used for reflecting the laser output by the tunable DBR laser back to the tunable DBR laser to enable the tunable DBR laser to generate chaotic laser output; the random fiber laser is used for randomly amplifying chaotic laser output by the tunable DBR laser and outputting random laser, and the random laser part returns to the tunable DBR laser and then further disturbs the output laser; the fiber Bragg grating is used for reflecting the residual pump light so that the residual pump light returns to the single-mode fiber to participate in the chaotic laser amplification process.
The optical attenuator is a one-way attenuator and is used for attenuating the light returning to the tunable DBR laser.
The center light frequency of the tunable laser is 13THz greater than that of the tunable DBR laser, and the tuning ranges of the tunable laser and the tunable DBR laser are both 40 nm.
The central wavelength of the fiber Bragg grating is the same as the wavelength of the pump light output by the tunable laser.
The reflectivity of the fiber Bragg grating on the side close to the single-mode fiber is 95%.
The length of the single-mode optical fiber is 15 km.
The second optical coupler is a 1 x 2 optical coupler, and the splitting ratio of the first port and the second port is 20: 80.
Compared with the prior art, the invention has the following beneficial effects:
1. the chaotic laser adopts a semi-open cavity tunable random fiber laser structure, the chaotic laser output by the tunable DBR laser is injected into the random laser which provides a pumping light source for the tunable laser, and the chaotic laser is effectively optically amplified by the random laser by utilizing the characteristic of high output power of the random laser, so that the hectowatt-level tunable chaotic light source is obtained.
2. Compared with the EDFA, the invention is not affected by erbium ion gain saturation, can greatly improve the signal-to-noise ratio, and can improve the conversion efficiency of the pump light.
3. The invention adopts the broadband dielectric film reflector to form a semi-open cavity tunable random fiber laser structure, and the broadband dielectric film reflector is arranged at the output end of the random laser, so that the threshold value can be obviously reduced, the utilization rate of light is improved, and meanwhile, the broadband dielectric film reflector is used as a feedback cavity generated by chaos to further increase the wavelength tuning range of the chaotic laser, and finally, the structural gain bandwidth of the invention meets the tuning range of the chaotic laser, namely 40 nm.
In summary, the invention provides a high-power tunable chaotic laser source device, which can realize hundreds of watts of high power, has a large tunable range, good time domain stability and good light beam quality.
Drawings
Fig. 1 is a schematic structural diagram of a high-power tunable chaotic laser light source device according to an embodiment of the present invention.
In the figure: the tunable optical fiber Bragg grating optical coupler comprises a 1-tunable DBR laser, a 2-optical attenuator, a 3-tunable laser, a 4-first optical coupler, a 5-single mode optical fiber, a 6-optical fiber Bragg grating, a 7-second optical coupler and an 8-broadband dielectric film reflecting mirror.
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 high-power tunable chaotic laser light source device, which includes a tunable DBR laser 1, an optical attenuator 2, a tunable laser 3, a first optical coupler 4, a single-mode optical fiber 5, a fiber bragg grating 6, a second optical coupler 7, and a broadband dielectric film mirror 8; the tunable DBR laser 1 is connected with one end of the optical attenuator 2, the other end of the optical attenuator 2 is connected with a first port of the first optical coupler 4, the tunable laser 3 is connected with a second port of the first optical coupler 4, a common port of the first optical coupler 4 is connected with a common port of the second optical coupler 7 after being sequentially connected with the single-mode optical fiber 5 and the fiber Bragg grating 6, a first port of the second optical coupler 7 is connected with the broadband dielectric film reflecting mirror 8, and a second port is used for outputting the amplified chaotic laser.
In this embodiment, laser output by the tunable DBR laser 1 enters a single-mode fiber 5 through an optical attenuator 2 and a first optical coupler 4, a hundred-watt-level pump light output by the tunable laser 3 enters the single-mode fiber 5 through the first optical coupler 4, and the tunable laser 3, the first optical coupler 4, the single-mode fiber 5, the fiber bragg grating 6 and the broadband dielectric film reflecting mirror 8 form a random fiber laser; the broadband dielectric film reflecting mirror 8 is used for reflecting the laser output by the tunable DBR laser 1 back to the tunable DBR laser 1 to enable the tunable DBR laser 1 to generate tunable chaotic laser output, and in addition, the random laser generated in the random fiber laser also returns to the tunable DBR laser 1 after passing through the first optical coupler 4 and the optical attenuator 2 to generate chaotic disturbance on the random laser; the fiber Bragg grating 6 is used for reflecting the residual pump light to enable the residual pump light to return to the single mode fiber 5 to participate in the chaotic laser amplification process.
Specifically, in this embodiment, the optical attenuator 2 is a one-way attenuator, and is configured to attenuate light returning to the tunable DBR laser 1.
Specifically, in this embodiment, the central optical frequency of the tunable laser 3 is 13THz greater than that of the tunable DBR laser 1, and the tuning ranges of the tunable laser 3 and the tunable DBR laser 1 are both 40 nm.
Specifically, in this embodiment, the center wavelength of the fiber bragg grating 6 is the same as the wavelength of the pump light output by the tunable laser 3. The reflectivity of the fiber Bragg grating 6 is 95%. The length of the single-mode optical fiber 5 is 15 km.
Specifically, in this embodiment, the first optical coupler 4 and the second optical coupler 7 are 1 × 2 optical couplers, and the splitting ratio of the first port and the second port of the second optical coupler 7 is 20: 80.
Specifically, in this embodiment, the center wavelength of the tunable DBR laser 1 is 1550nm, and the output power is in the milliwatt level; the center wavelength of the tunable laser 3 is 1450nm, and the output power is hundreds of watts; the wavelength tuning ranges of the tunable laser 3 and the tunable DBR laser 1 are both 40nm, the central wavelength of the optical fiber Bragg grating (6) is 1450nm, the power of the chaotic laser output from the second port of the second optical coupler 7 is hundreds of watts, the central wavelength is 1550nm, and the wavelength tuning range is 1526 nm-1566 nm.
According to the stimulated raman scattering theory, the following relationship is given:
wherein the content of the first and second substances,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 and the seed light output by the raman laser 3 (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 and Stokes light corresponding to the pump lightA corresponding refractive index;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 optimal solution is that the central wavelength of the Raman laser 3 is 100 nm smaller than that of the seed light.
According to the theory of light propagation in optical fibers, there are:
wherein the content of the first and second substances,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. And (4), (6) and (7) are combined, and the length of the single-mode optical fiber in the random laser can be calculated by combining with the chaos light of the output high power (hundred watt level): the optimal solution for the length of the single mode fiber 5 is z =15 km.
In the embodiment of the invention, a tunable laser 3, a 2 × 1 optical coupler 4, a single-mode fiber 5, a fiber bragg grating 6 and a broadband dielectric film mirror 8 form a half-open-cavity tunable random fiber laser, as shown by a dashed box in fig. 1. The semi-open cavity tunable random fiber laser participates in the dynamic process of chaotic laser generation. Specifically, on one hand, light output by the tunable DBR laser 1 reaches the half-open cavity tunable random fiber laser part through the optical attenuator 2, and is reflected back to the tunable DBR laser 1 by the broadband dielectric film reflecting mirror 8; on the other hand, part of the random laser generated by the semi-open cavity tunable random fiber laser is output from the left side and injected into the tunable DBR laser 1. Therefore, the optical hybrid perturbation tunable DBR laser 1 of the two processes generates tunable chaotic laser with higher complexity. When tunable chaotic laser generated by the tunable DBR laser 1 reaches the semi-open cavity tunable random fiber laser through the optical attenuator 2, the tunable chaotic laser is amplified to a hundred watt level by the random fiber laser, and the hundred watt level tunable chaotic laser is output through the optical coupler 7. In the invention, the pump light power output by the tunable laser 3 is in the hundred watt level, so that the chaotic laser can be amplified by the random laser and can be output from the second port of the second optical coupler 7 within the range of 1526 nm to 1566 nm in the hundred watt level.
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 (7)
1. A high-power tunable chaotic laser source device is characterized by comprising a tunable DBR laser (1), an optical attenuator (2), a tunable laser (3), a first optical coupler (4), a single-mode optical fiber (5), a fiber Bragg grating (6), a second optical coupler (7) and a broadband dielectric film reflecting mirror (8);
the tunable DBR laser (1) is connected with one end of an optical attenuator (2), the other end of the optical attenuator (2) is connected with a first port of a first optical coupler (4), a tunable laser (3) is connected with a second port of the first optical coupler (4), a common port of the first optical coupler (4) is connected with a common port of a second optical coupler (7) after being sequentially connected with a single-mode optical fiber (5) and a fiber Bragg grating (6), a first port of the second optical coupler (7) is connected with a broadband dielectric film reflecting mirror (8), and the second port is used for outputting amplified chaotic laser;
laser output by the tunable DBR laser (1) enters a single mode fiber (5) through an optical attenuator (2) and a first optical coupler (4); the pump light of hundred watt level output by the tunable laser (3) enters the single-mode fiber (5) through the first optical coupler (4), and the tunable laser (3), the first optical coupler (4), the single-mode fiber (5), the fiber Bragg grating (6) and the broadband dielectric film reflecting mirror (8) form a random fiber laser; the broadband dielectric film reflecting mirror (8) is used for reflecting the laser output by the tunable DBR laser (1) back to the tunable DBR laser (1) to enable the laser to generate chaotic laser output; the random fiber laser is used for randomly amplifying chaotic laser output by the tunable DBR laser (1) and outputting random laser, and the random laser part returns to the tunable DBR laser (1) and then further disturbs the output laser; the fiber Bragg grating (6) is used for reflecting the residual pump light to enable the residual pump light to return to the single-mode fiber (5) to participate in the chaotic laser amplification process.
2. The high-power tunable chaotic laser source device according to claim 1, wherein the optical attenuator (2) is a one-way attenuator for attenuating the light returning to the tunable DBR laser (1).
3. The high-power tunable chaotic laser source device as claimed in claim 1, wherein the tunable laser (3) has a central optical frequency 13THz higher than that of the tunable DBR laser (1), and the tuning ranges of the tunable laser (3) and the tunable DBR laser (1) are both 40 nm.
4. The high-power tunable chaotic laser light source device according to claim 1, wherein the central wavelength of the fiber bragg grating (6) is the same as the wavelength of the pump light output by the tunable laser (3).
5. The high-power tunable chaotic laser light source device according to claim 1, wherein the reflectivity of the fiber bragg grating (6) on the side close to the single-mode fiber (5) is 95%.
6. A high power tunable chaotic laser source device according to claim 1, wherein the length of the single mode fiber (5) is 15 km.
7. The high-power tunable chaotic laser light source device according to claim 1, wherein the second optical coupler (7) is a 1 x 2 optical coupler, and the splitting ratio of the first port to the second port is 20: 80.
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Cited By (2)
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| CN112615710A (en) * | 2020-12-08 | 2021-04-06 | 太原理工大学 | Key distribution system based on DBR laser wavelength keying synchronization |
| CN113206437A (en) * | 2021-05-08 | 2021-08-03 | 北方工业大学 | All-optical noise-like chaotic laser generator |
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