CN115360569A - Multi-wavelength random fiber laser based on inclined parallel writing fiber grating array - Google Patents
Multi-wavelength random fiber laser based on inclined parallel writing fiber grating array Download PDFInfo
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- CN115360569A CN115360569A CN202210971562.5A CN202210971562A CN115360569A CN 115360569 A CN115360569 A CN 115360569A CN 202210971562 A CN202210971562 A CN 202210971562A CN 115360569 A CN115360569 A CN 115360569A
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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
- H01S3/09—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
Abstract
The invention discloses a multi-wavelength random fiber laser based on an inclined parallel writing fiber grating array, which belongs to the technical field of fiber lasers and comprises a pumping light source, a fiber grating array, a grating axial stretching device, a wavelength division multiplexer and a gain amplification unit, wherein the pumping light enters the gain amplification unit through the coupling of the wavelength division multiplexer to be excited, and the gain amplification unit is used for carrying out gain amplification on the pumping light source in a light path; after the central wavelength of the fiber grating array is changed by strain adjustment of the grating axial stretching device, feedback and wavelength selection of gain light are provided; the gain light reflected by the fiber grating array is amplified in the gain amplifying unit, and multi-wavelength random laser output is gradually formed along with the increase of the power of the pumping light source. The invention uses the inclined parallel writing optical fiber grating array as a multi-wavelength selection device and a laser cavity high-reflection mirror at one end, and uses the Raman optical fiber at the other end to provide Rayleigh scattering feedback, thereby reducing the number of devices constituting the laser and having simpler structure.
Description
Technical Field
The invention belongs to the technical field of fiber lasers, and particularly relates to a multi-wavelength random fiber laser based on an inclined parallel writing fiber grating array.
Background
The multi-wavelength fiber laser is widely applied in the fields of optical communication, optical fiber sensing, laser ranging, spectral analysis and the like. At present, the multi-wavelength fiber laser mainly adopts two modes to realize multi-wavelength lasing:
(1) A multi-wavelength selection device such as a Fabry-Perot filter, a fiber Bragg grating, a Sagnac ring, a Lyot filter and the like is added in the cavity, and the mode can realize the regulation and control of multi-wavelength lasing parameters by adjusting the multi-wavelength selection device, but can damage the original cavity structure and introduce additional loss;
(2) By utilizing nonlinear effects such as stimulated Brillouin scattering, stimulated Raman scattering and four-wave mixing, the method can control the lasing wavelength by adjusting the wavelength of the pump light, but the multi-wavelength parameters such as wavelength interval are determined by the optical fiber, so that the adjustability is poor;
random fiber lasers have become an important way of generating multi-wavelength lasers in recent years. Compared with the traditional multi-wavelength fiber laser adopting rare earth doped fiber to provide gain, the random fiber laser has the advantages of simple structure, no mode, low coherence and the like, and can conveniently combine stimulated Raman scattering to improve the utilization efficiency of the pump and realize the lasing of more wave bands. With the development of femtosecond laser direct writing technology, the femtosecond laser can be used for flexibly preparing fiber gratings with various parameters, and based on the technology and the combination of random fiber laser technology, a multi-parameter flexibly tunable multi-wavelength random fiber laser is hopeful to be realized, thereby being beneficial to practical application.
Disclosure of Invention
In view of the above defects or improvement requirements of the prior art, the present invention provides a multi-wavelength random fiber laser based on an inclined parallel writing fiber grating array, and aims to provide feedback and wavelength selection of gain light by fixing the fiber grating array on an axial grating stretching device to adjust the central wavelength through strain, thereby solving the technical problem of poor adjustability of the multi-wavelength random fiber laser in the prior art.
In order to achieve the above object, according to one aspect of the present invention, there is provided a multi-wavelength random fiber laser based on an inclined parallel writing fiber grating array, wherein the laser has a semi-open cavity structure and includes a pump light source, a fiber grating array, a grating axial stretching device, a wavelength division multiplexer, and a gain amplification unit;
the pumping light source is connected with the input end of the wavelength division multiplexer; the output end of the wavelength division multiplexer is connected with the gain amplification unit; the fiber bragg grating array is fixedly arranged on the grating axial stretching device;
the pumping light source is used for generating pumping light, the pumping light is coupled into the gain amplification unit through the wavelength division multiplexer to be excited, and the gain amplification unit is used for exciting to generate erbium ion gain, raman gain and Rayleigh scattering feedback and amplifying the pumping light source gain in the optical path; after the central wavelength of the fiber grating array is changed by strain adjustment of the grating axial stretching device, feedback and wavelength selection of gain light are provided; and the gain light reflected by the fiber grating array is amplified in the gain amplification unit, and multi-wavelength random laser output is gradually formed along with the increase of the power of the pumping light source.
Preferably, the fiber grating array includes a fiber core and a plurality of high-reflectivity fiber gratings, and the plurality of high-reflectivity fiber gratings are distributed in parallel along the axial direction of the fiber core.
Preferably, the high-reflectivity fiber gratings have the same reflectivity but different center wavelengths.
Preferably, each of the plurality of high-reflectivity fiber gratings is written by a femtosecond laser in a point-by-point method.
Preferably, the manufacturing method of the fiber grating array specifically comprises the following steps: placing an optical fiber on a displacement platform, writing a first fiber grating by using a point-by-point method by means of femtosecond laser, moving the optical fiber for a certain distance along the axial direction, and writing a fiber grating with a longer central wavelength again; and monitoring the transmission spectrum and the reflection spectrum of the fiber grating in real time in the writing process until obtaining the inclined parallel writing fiber grating array with the target transmission spectrum and the target reflection spectrum.
Preferably, the gain amplification unit includes a gain fiber and a raman fiber; one end of the gain optical fiber is connected to the output end of the wavelength division multiplexer, and the other end of the gain optical fiber is connected with the Raman optical fiber.
Preferably, the gain fiber is an erbium-doped fiber.
Preferably, the Raman fiber laser further comprises an isolator, wherein the isolator is used as a laser output end and is connected to one end of the Raman fiber.
Preferably, the central wavelength of the pump light source is 1455nm.
Preferably, one end of the fiber grating array is cut obliquely to eliminate parasitic feedback of the port.
In general, compared with the prior art, the above technical solution contemplated by the present invention can achieve the following beneficial effects:
1. compared with the traditional multi-wavelength fiber laser needing to be additionally added with a multi-wavelength selection device, the multi-wavelength random fiber laser based on the inclined parallel writing fiber grating array uses the inclined parallel writing fiber grating array as the multi-wavelength selection device and the high reflection mirror of the laser cavity at one end, uses the Raman fiber at the other end to provide Rayleigh scattering feedback, reduces the number of devices forming the laser, and has a simpler structure.
2. The multi-wavelength random fiber laser based on the oblique parallel writing fiber grating array is easy to prepare in each wave band, so that the multi-wavelength random fiber laser can flexibly select the type of a gain fiber, the type of a Raman fiber and the wavelength of a pumping light source.
3. The multi-wavelength random fiber laser based on the oblique parallel writing fiber grating array provided by the invention has the advantages of simple and quick preparation, flexible control of wavelength interval and wavelength number and small device size.
4. Compared with a random fiber laser based on a single gain mechanism, the multi-wavelength random fiber laser based on the inclined parallel writing fiber grating array simultaneously utilizes the gain of the gain fiber and the stimulated Raman scattering gain of the single-mode fiber, thereby effectively reducing the lasing threshold and improving the output power.
Drawings
FIG. 1 is a schematic diagram of an oblique parallel writing fiber grating array according to the present invention;
FIG. 2 (a) is a reflection spectrum of an oblique parallel writing fiber grating array prepared by the present invention;
FIG. 2 (b) is the transmission spectrum of the tilted parallel-inscribed fiber grating array prepared in the present invention;
FIG. 3 is a schematic diagram of a multi-wavelength random fiber laser based on an oblique parallel writing fiber grating array according to the present invention;
FIG. 4 is a graph of the output power of a multi-wavelength random fiber laser based on an oblique parallel writing fiber grating array according to the present invention;
fig. 5 is a graph of output spectra of a multi-wavelength random fiber laser based on tilted parallel writing fiber grating arrays according to the present invention, when the tilted parallel writing fiber grating arrays are used with different numbers of wavelengths.
The same reference numbers will be used throughout the drawings to refer to the same elements or structures, wherein: 11-a first high reflectivity fiber grating; 12-a second high reflectivity fiber grating; 13-a third high-reflectivity fiber grating; 14-the last high reflectivity fiber grating; 15-axial spacing of adjacent high-reflectivity fiber gratings; 16-a fiber core; 17-fiber cladding; 31-a pump light source; 32-oblique cutting; 33-a grating axial stretching device; 34-fiber grating array; 35-wavelength division multiplexer; 36-gain fiber; 37-raman fiber; 38-isolator.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
As shown in fig. 1-5, the present invention provides a multi-wavelength random fiber laser based on an oblique parallel writing fiber grating array, which includes a pump light source 31, a grating axial stretching device 33, an oblique parallel writing fiber grating array 34, a wavelength division multiplexer 35, a gain fiber 36, a raman fiber 37, and an isolator 38; the fiber grating array 34 is composed of a plurality of high-reflectivity fiber gratings with different central wavelengths and the same reflectivity; the center wavelength of the fiber grating array 34 should substantially correspond to the gain lines of the gain fiber 36 and the raman fiber 37; the fiber grating array 34 is prepared by femtosecond laser by using an oblique parallel writing technology; the fiber grating array 34 is fixed on the grating axial stretching device 33 through glue or a fiber clamp; one end of the fiber grating array 34 is obliquely cut 32.
Further, the pump light source 31 is coupled into the gain fiber 36 and the raman fiber 37 through the wavelength division multiplexer 35 to amplify the multi-wavelength laser; the raman fiber 37 provides both stimulated raman scattering gain and rayleigh scattering feedback; the isolator 38 isolates the reflected light and serves as the laser output.
As a preferred embodiment of the present invention, the gain fiber 36 is an erbium-doped fiber.
In a preferred embodiment of the present invention, the raman fiber 37 is a normal single mode fiber with a length of 10km.
The working principle of the invention is as follows:
the pump light source with the center wavelength of 1455nm simultaneously provides pumping for the erbium-doped fiber and the Raman fiber, the initially generated broadband spontaneous emission light is selected by the high-reflectivity fiber grating array at one end and reflects light with corresponding wavelength to return to the cavity for amplification, and then the light is combined with Rayleigh scattering feedback provided by the Raman fiber at the other end to finally form multi-wavelength lasing.
The technical solution of the present invention is further illustrated by the following specific examples.
Example one
A schematic diagram of the fiber grating array which is obliquely and parallelly written is shown in figure 1 and consists of a plurality of first high-reflectivity fiber gratings 11, second high-reflectivity fiber gratings 12, third high-reflectivity fiber gratings 13 and last high-reflectivity fiber gratings 14 which are distributed in parallel in the axial direction of a fiber core 16 and have different central wavelengths but the same reflectivity, wherein each high-reflectivity fiber grating is written by femtosecond laser in a point-by-point method.
To be further explained, the central wavelength, the reflectivity and the axial spacing 15 of the fiber grating are determined according to actual needs and preparation effects; the reflectivity is required to be as high as possible under the condition of ensuring that the insertion loss of the fiber bragg grating is small so as to reduce the threshold value of the laser; the axial distance is as small as possible under the condition that adjacent fiber gratings are not interfered with each other, so that the total length of the oblique parallel writing fiber grating array is shortened.
Example two
A method for preparing an inclined parallel writing fiber grating array for a multi-wavelength random fiber laser is used for preparing the inclined parallel writing fiber grating array, and the operation method comprises the following steps:
the method comprises the following steps: fixing a section of optical fiber on a displacement platform to make the femtosecond laser beam vertically incident and focused in the fiber core of the optical fiber
Step two: controlling the optical fiber to move relative to the femtosecond laser focusing light spot along a straight line inclined to the axial direction of the optical fiber by a certain angle, writing a first target fiber grating by using a point-by-point method, and monitoring a transmission spectrum and a reflection spectrum;
step three: controlling the optical fiber to move along the axial direction of the optical fiber for a certain axial distance, then writing a fiber grating with longer central wavelength and the same other parameters again, and monitoring a transmission spectrum and a reflection spectrum;
step four: and repeating the third step until obtaining the inclined parallel writing fiber grating array with the target transmission spectrum and the target reflection spectrum.
In this embodiment, the optical fiber is a common single mode optical fiber; the axial length of the fiber bragg grating is 4000 micrometers, and the axial distance is 1000 micrometers; the reflection spectrum and transmission spectrum of a 3-wavelength slant parallel writing fiber grating array are shown in fig. 2 (a) and fig. 2 (b), the fiber grating reflectivity is 65%, the center wavelength interval is 4nm, and the long wavelength loss is 15%.
EXAMPLE III
The experimental device of the experiment is shown in fig. 3, and includes a pump light source 31, where the pump light source 31 enters a gain fiber 36 and a raman fiber 37 through a wavelength division multiplexer 35 for excitation; the gain optical fiber is an erbium-doped optical fiber and provides gain by utilizing erbium ions; the Raman fiber is a common single-mode fiber, the length of the Raman fiber is 10km, and Raman gain and Rayleigh scattering feedback are provided at the same time; an inclined parallel writing fiber grating array 34 is used for providing feedback and wavelength selection, and is fixed on a grating axial stretching device 33 to adjust the central wavelength through strain; the light reflected by the fiber grating array 34 is amplified in the gain fiber 36 and the raman fiber 37, and random laser output is gradually formed along with the increase of the pumping power; one end bevel cut 32 is used to avoid parasitic feedback; a polarization independent isolator 38 isolates the reflected light and serves as a laser output; the whole laser is in a semi-open cavity structure.
The output power curve of the laser based on the tilted parallel writing fiber grating array in the second embodiment is shown in fig. 4, the threshold power is about 0.7W, and linear fitting shows that the slope efficiency of the laser is about 49.6%, 0.883W output power can be obtained under the maximum pumping power of 2.49W, the corresponding light-to-light conversion efficiency is about 35.5%, and the laser output power and the lasing multi-wavelength spectrum are both stable. The laser outputs with different wavelength numbers as shown in fig. 5 can be obtained by replacing the tilted parallel writing fiber grating array, and each wavelength has good correspondence with the tilted parallel writing fiber grating array. In addition, the central wavelength of the output laser can be easily changed by utilizing the strain provided by the grating axial stretching device.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. The multi-wavelength random fiber laser based on the inclined parallel writing fiber grating array is characterized in that the laser is of a semi-open cavity structure and comprises a pumping light source (31), a fiber grating array (34), a grating axial stretching device (33), a wavelength division multiplexer (35) and a gain amplification unit;
the pumping light source (31) is connected with the input end of the wavelength division multiplexer (35); the output end of the wavelength division multiplexer (35) is connected with the gain amplification unit; the fiber grating array (34) is fixedly arranged on the grating axial stretching device (33);
the pumping light source (31) is used for generating pumping light, the pumping light is coupled into the gain amplification unit through the wavelength division multiplexer (35) to be excited, and the gain amplification unit is used for being excited to generate erbium ion gain, raman gain and Rayleigh scattering feedback and amplifying the pumping light source gain in an optical path; the fiber grating array (34) is subjected to strain adjustment by the grating axial stretching device (33) to change the central wavelength thereof, and then feedback and wavelength selection of gain light are provided; the gain light reflected by the fiber grating array (34) is amplified in the gain amplifying unit, and multi-wavelength random laser output is gradually formed along with the increase of the power of the pumping light source (31).
2. The multiwavelength random fiber laser based on an oblique parallel writing fiber grating array according to claim 1, wherein the fiber grating array (34) comprises a fiber core (16) and a plurality of high reflectivity fiber gratings distributed axially in parallel along the fiber core (16).
3. The multiwavelength random fiber laser based on an oblique parallel writing fiber grating array according to claim 2, wherein the reflectivities of the plurality of high-reflectivity fiber gratings are the same but the center wavelengths are all different.
4. The multiwavelength random fiber laser based on the tilted parallel writing fiber grating array of claim 3, wherein each of the plurality of high reflectivity fiber gratings is written using a point-by-point method with a femtosecond laser.
5. The multiwavelength random fiber laser based on the tilted parallel writing fiber grating array according to claim 4, wherein the manufacturing method of the fiber grating array (34) is specifically as follows: placing an optical fiber on a displacement platform, writing a first fiber grating by using a point-by-point method by means of femtosecond laser, moving the optical fiber for a certain distance along the axial direction, and writing a fiber grating with a longer central wavelength again; and monitoring the transmission spectrum and the reflection spectrum of the fiber bragg grating in real time in the writing process until an inclined parallel writing fiber bragg grating array with a target transmission spectrum and a target reflection spectrum is obtained.
6. The multiwavelength random fiber laser based on tilted parallel inscription fiber grating array of claim 1, wherein the gain amplification unit comprises a gain fiber (36) and a raman fiber (37); one end of the gain fiber (36) is connected to the output end of the wavelength division multiplexer (35), and the other end of the gain fiber is connected to the Raman fiber (37).
7. The multiwavelength random fiber laser based on an inclined parallel-inscribed fiber grating array of claim 6, wherein the gain fiber (36) is an erbium-doped fiber.
8. The multiwavelength random fiber laser based on tilted parallel write fiber grating array according to claim 6, further comprising an isolator (38), the isolator (38) being connected as a laser output to one end of the raman fiber (37).
9. The multiwavelength random fiber laser based on an oblique parallel writing fiber grating array according to claim 1, wherein the central wavelength of the pump light source (31) is 1455nm.
10. The multiwavelength random fiber laser based on tilted parallel inscription fiber grating array of claim 1, wherein one end of the fiber grating array (34) is tilted cut to eliminate parasitic feedback of ports.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115966987A (en) * | 2023-03-16 | 2023-04-14 | 安徽科创中光科技股份有限公司 | Multi-wavelength laser capable of being screened |
| CN116720232A (en) * | 2023-06-13 | 2023-09-08 | 上海频准激光科技有限公司 | Method for selecting a fiber laser assembly |
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- 2022-08-12 CN CN202210971562.5A patent/CN115360569A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115966987A (en) * | 2023-03-16 | 2023-04-14 | 安徽科创中光科技股份有限公司 | Multi-wavelength laser capable of being screened |
| CN115966987B (en) * | 2023-03-16 | 2023-06-06 | 安徽科创中光科技股份有限公司 | Multi-wavelength laser capable of being screened |
| CN116720232A (en) * | 2023-06-13 | 2023-09-08 | 上海频准激光科技有限公司 | Method for selecting a fiber laser assembly |
| CN116720232B (en) * | 2023-06-13 | 2023-12-15 | 上海频准激光科技有限公司 | Method for selecting a fiber laser assembly |
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