CN114966976A - Mode-locked fiber laser of composite planar graphene oxide film of micro-ring resonator - Google Patents
Mode-locked fiber laser of composite planar graphene oxide film of micro-ring resonator Download PDFInfo
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- CN114966976A CN114966976A CN202210460004.2A CN202210460004A CN114966976A CN 114966976 A CN114966976 A CN 114966976A CN 202210460004 A CN202210460004 A CN 202210460004A CN 114966976 A CN114966976 A CN 114966976A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/255—Splicing of light guides, e.g. by fusion or bonding
- G02B6/2552—Splicing of light guides, e.g. by fusion or bonding reshaping or reforming of light guides for coupling using thermal heating, e.g. tapering, forming of a lens on light guide ends
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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
- H01S3/06791—Fibre ring 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
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/11—Mode locking; Q-switching; Other giant-pulse techniques, e.g. cavity dumping
- H01S3/1106—Mode locking
- H01S3/1112—Passive mode locking
- H01S3/1115—Passive mode locking using intracavity saturable absorbers
- H01S3/1118—Semiconductor saturable absorbers, e.g. semiconductor saturable absorber mirrors [SESAMs]; Solid-state saturable absorbers, e.g. carbon nanotube [CNT] based
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Abstract
The invention discloses a method for manufacturing a micro-ring resonator of a composite planar graphene oxide film, which is characterized in that an absolute ethyl alcohol liquid drop is formed on the inner side of a micro-ring by utilizing the special two-dimensional plane structure of the micro-ring resonator and the low surface tension characteristic of the absolute ethyl alcohol liquid, then a graphene oxide water dispersion liquid and the absolute ethyl alcohol liquid drop are mutually dissolved, and a layer of graphene oxide film is formed on the inner side of the micro-ring after a solvent is naturally evaporated. The invention also discloses a micro-ring resonator of the composite planar graphene oxide film. Finally, the invention also discloses a mode-locked fiber laser of the composite planar graphene oxide film of the microring resonator, which comprises a pumping light source, a wavelength division multiplexer, an erbium-doped gain fiber, a polarization controller, an isolator, a microring resonator of the composite planar graphene oxide film and a fiber coupler. The mode-locked fiber laser of the composite planar graphene oxide film of the micro-ring resonator provided by the invention can realize the mode-locked fiber laser output with high stability, low self-starting mode-locked pumping power, high coherence and high damage threshold.
Description
Technical Field
The invention relates to a mode-locked fiber laser of a micro-ring resonator composite planar graphene oxide film, and belongs to the technical field of fiber lasers.
Background
The narrow-linewidth pulse fiber laser has excellent spectral resolution, and has important application in the fields of quantum optics, fiber parametric oscillators, Raman microscopes and the like. The mode locking mode can be realized by active mode locking and passive mode locking, wherein the saturable absorber is the main passive mode locking technology at present. The micro-ring resonator has the characteristics of high quality factor, controllable free spectral range, good compatibility with the optical fiber laser and the like, is widely applied to the optical fiber laser, and realizes narrow linewidth laser output.
The saturable absorber adopted at present mainly comprises a semiconductor saturable absorber mirror (SESAM), graphene, transition metal sulfide and the like. The SESAM has been applied to a commercial ultrashort pulse fiber laser, and has disadvantages of complex manufacturing process, high cost, and poor compatibility with a fiber laser resonant cavity. The graphene has broadband saturable absorption characteristics, and has the defects of large unsaturated loss, low modulation depth and low damage threshold. Graphene oxide has a saturable absorption characteristic comparable to that of graphene, and has strong hydrophilicity due to the presence of functional groups. Particularly, the process for directly preparing the graphene oxide aqueous solution is simpler and lower in cost than graphene. Earlier studies proposed two graphene oxides in combination with fiber lasers as the solution for saturation absorption. One is to adopt a thin film made of a graphene oxide-polyvinyl alcohol mixed solution and place the thin film on the micron-sized end face of an optical fiber jumper as a saturable absorber, and in the scheme, the defects of low damage threshold, low tunable performance and the like of the saturable absorber are caused by poor heat dissipation of a device, small laser action plane, uncontrollable thickness and the like. According to the scheme, the pumping power of the self-starting mode locking of the optical fiber laser is high due to the fact that the surface roughness of a transferred graphene oxide film is high, the action area of laser and graphene oxide is limited, the insertion loss is high and the like.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a mode-locked fiber laser of a micro-ring resonator composite planar graphene oxide film, which can realize the mode-locked fiber laser output with high stability, low self-starting mode-locked pumping power, high coherence and high damage threshold.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a manufacturing method of a micro-ring resonator of a composite planar graphene oxide film comprises the following steps:
tapering a standard single-mode fiber by a fused tapering technology to obtain a double-end tapered fiber, knotting the double-end tapered fiber by a micro-displacement control technology, and tensioning the knotted position by a three-dimensional control platform to obtain a micro-ring resonator;
extracting an absolute ethyl alcohol solution by using a pipettor, extruding an absolute ethyl alcohol droplet, sticking the absolute ethyl alcohol droplet to the middle of the micro-ring, and then removing the absolute ethyl alcohol droplet to form the absolute ethyl alcohol droplet on the inner side of the micro-ring resonator;
taking the graphene oxide dispersion liquid by using a pipettor, and carrying out ultrasonic oscillation for a period of time to ensure that the graphene oxide dispersion liquid is uniformly dispersed;
extracting the uniformly dispersed graphene oxide nanosheet dispersion liquid by using a pipettor, extruding graphene oxide aqueous solution droplets, attaching the graphene oxide aqueous solution droplets to the absolute ethyl alcohol droplets on the inner side of the micro-ring resonator, so that the graphene oxide aqueous solution droplets and the absolute ethyl alcohol droplets are mutually dissolved, and forming a layer of mixed droplets of absolute ethyl alcohol and graphene oxide aqueous dispersion liquid on the inner side of the micro-ring resonator;
standing and drying for a period of time at normal temperature to uniformly disperse the nanosheets in the graphene oxide dispersion liquid in the mixed solution drops on the inner side of the microring resonator, compounding the mixed solution drops with an ethanol solvent to form a layer of graphene oxide planar film on the surface of the microring resonator after the ethanol solvent in the mixed solution drops is naturally evaporated, and preliminarily drying the microring resonator compounded with the planar graphene oxide film;
connecting a micro-ring resonator of the primarily dried composite planar graphene oxide film between a broadband light source and a spectrometer, testing the transmission spectrum of the micro-ring resonator, and improving the extinction ratio of the transmission spectrum by finely adjusting the size and the shape of the micro-ring resonator;
the micro-ring resonator of the composite planar graphene oxide film is packaged on a glass slide by using ultraviolet glue and is placed in a closed box for drying for a period of time.
The diameter of the double-end tapered optical fiber is 1-3 μm.
The circle diameter range of the micro-ring resonator is 100-2000 mu m.
The concentration of the graphene oxide dispersion liquid is 0.5-1 mg/ml, and the ultrasonic oscillation time is 2 hours.
Standing and drying at normal temperature for 15-30 min.
And drying in a closed box for 24-48 h.
A microring resonator of a composite planar graphene oxide film is manufactured by the manufacturing method of the microring resonator of the composite planar graphene oxide film.
The mode-locked fiber laser comprises a pumping light source, wherein the pumping light source is connected with the input end of a wavelength division multiplexer, the output end of the wavelength division multiplexer is connected with one end of an erbium-doped gain fiber, the other end of the erbium-doped fiber is connected with the input end of a polarization controller, the output end of the polarization controller is connected with the input end of an isolator, the output end of the isolator is connected with the input end of a micro-ring resonator of the composite planar graphene oxide film, the output end of the micro-ring resonator of the composite planar graphene oxide film is connected with one input end of an optical fiber coupler, the output end of the optical fiber coupler is connected with the input end of the wavelength division multiplexer, and the other output end of the optical fiber coupler is the output end of the mode-locked fiber laser.
And the other output end of the optical fiber coupler is connected with the spectrum analyzer, the oscilloscope and the spectrum analyzer.
A mode-locked fiber laser of a micro-ring resonator composite planar graphene oxide film is characterized in that a pumping light source, a wavelength division multiplexer, an erbium-doped gain fiber, a polarization controller, an isolator, a micro-ring resonator of the composite planar graphene oxide film and a fiber coupler are sequentially connected with one another in a fiber fusion mode, and the wavelength division multiplexer is connected with the fiber coupler in a fiber fusion mode.
The invention has the beneficial effects that: according to the mode-locked fiber laser of the micro-ring resonator composite planar graphene oxide film, the micro-ring resonator of the composite planar graphene oxide film transfers the droplets of the mixed solution of the absolute ethyl alcohol and the graphene oxide aqueous dispersion liquid on the inner side of the micro-ring based on the special two-dimensional plane structure of the micro-ring resonator and the surface tension characteristic of the liquid, the surface tension of the droplets of the mixed solution of the absolute ethyl alcohol and the graphene oxide aqueous dispersion liquid is used for driving the recirculation flow, so that graphene oxide nanosheets are uniformly dispersed in the droplets of the mixed solution, and the graphene oxide film transferred to the inner side of the micro-ring is guaranteed to be uniform in thickness and smooth in surface; the double-end tapered optical fiber is prepared by adopting a fused biconical taper method, and the micro-ring resonator is prepared based on a three-dimensional micro-displacement control method, so that the double-end tapered optical fiber has the characteristics of high Q value, low loss and good compatibility with an optical fiber laser resonant cavity; the prepared planar graphene oxide film compounded on the surface of the microring resonator has the characteristics of good heat dissipation performance, flat and smooth surface, large laser action plane, uniform and controllable thickness and small insertion loss; the mode-locked fiber laser based on the micro-ring resonator composite planar graphene oxide film has the characteristics of high laser output stability, low self-starting mode-locked pumping power, high damage threshold, good coherence and high side mode suppression ratio.
Drawings
FIG. 1 is a schematic structural diagram of a mode-locked fiber laser of a composite planar graphene oxide film of a micro-ring resonator according to the present invention;
fig. 2 to 5 are views showing a process of manufacturing a microring resonator of a composite planar graphene oxide film according to the present invention;
FIG. 6 is a microscope image of a composite planar graphene oxide film microring resonator of the present invention;
FIG. 7 shows the transmission spectrum of the composite planar graphene oxide film microring resonator from 1540nm to 1570 nm;
FIG. 8 is a laser spectrum of a mode-locked fiber laser with a wavelength range of 1560nm to 1565nm when the pumping power of the mode-locked fiber laser is 8mW, in which the micro-ring resonator is compounded with a planar graphene oxide film;
FIG. 9 is an output spectrogram of a mode-locked fiber laser with a composite planar graphene oxide film of a micro-ring resonator according to the present invention, measured within 100 minutes;
FIG. 10 is a pulse sequence diagram of a mode-locked fiber laser with a micro-ring resonator combined with a planar graphene oxide film according to the present invention;
FIG. 11 is a diagram of the radio frequency spectrum of a mode-locked fiber laser with a micro-ring resonator combined with a planar graphene oxide film in the range of 1 GHz;
fig. 12 is a graph of the radio frequency spectrum of a mode-locked fiber laser of a micro-ring resonator composite planar graphene oxide film in the range of 6 kHz.
The reference numbers in the figures are as follows: 1-a pump light source; 2-wavelength division multiplexer; 3-erbium doped gain fiber; 4-a polarization controller; 5-an isolator; 6-a microring resonator of a composite planar graphene oxide film; 7-fiber coupler.
Detailed Description
The present invention is further described in the following examples, which are only used to illustrate the technical solutions of the present invention more clearly, and should not be construed as limiting the scope of the present invention.
Detailed description of the preferred embodiment 1
As shown in fig. 1, the present invention provides a mode-locked fiber laser of a composite planar graphene oxide film of a microring resonator, which includes a pump light source 1, a wavelength division multiplexer 2, an erbium-doped gain fiber 3, a polarization controller 4, an isolator 5, a microring resonator 6 of a composite planar graphene oxide film, and a fiber coupler 7. The pump light source 1 is connected with the input end of the wavelength division multiplexer 2, the output end of the wavelength division multiplexer 2 is connected with one end of the erbium-doped gain fiber 3, the other end of the erbium-doped fiber 3 is connected with the input end of the polarization controller 4, the output end of the polarization controller 4 is connected with the input end of the isolator 5, the output end of the isolator 5 is connected with the input end of the micro-ring resonator 6 of the composite planar graphene oxide film, the output end of the micro-ring resonator 6 of the composite planar graphene oxide film is connected with the input end of the optical fiber coupler 7, the output end of the optical fiber coupler 7 is connected with the input end of the wavelength division multiplexer 2, and the other output end of the optical fiber coupler 7 is the output of the mode-locked optical fiber laser. The other output end of the optical fiber coupler 7 is connected with a spectrum analyzer, an oscilloscope and a spectrum analyzer. All the devices are connected with each other in sequence in a mode of optical fiber fusion.
As shown in fig. 2 to 5, which are schematic views of the manufacturing process of the micro-ring resonator of the composite planar graphene oxide film, the insets are physical views of the devices manufactured in the corresponding processes. The preparation method comprises the following steps:
firstly, a standard single-mode fiber is gradually thinned to a double-end tapered fiber with the diameter of about 3 mu m through a fusion tapering technology, then the double-end tapered fiber is knotted through a micro-displacement control technology, then a knot is slowly tightened to about 500 mu m through a three-dimensional control platform, and a picture of a micro-ring resonator is shown in fig. 2. Fig. 2 is a schematic diagram of a microring resonator without transferring graphene oxide dispersion, and an inset is a real diagram of the fabricated microring resonator.
And secondly, taking the graphene oxide dispersion liquid with the concentration of 1mg/ml by using a liquid transfer machine, and carrying out ultrasonic oscillation for 2 hours to uniformly disperse the graphene oxide dispersion liquid.
And step three, extracting the absolute ethyl alcohol solution by using a pipettor, gently extruding a drop of absolute ethyl alcohol drop, attaching the drop to the middle of the micro-ring, and then removing the drop, wherein the absolute ethyl alcohol drop is transferred on the inner side of the micro-ring due to the surface tension of the liquid as shown in fig. 3. Fig. 3 is a schematic diagram illustrating the operation of transferring the absolute ethyl alcohol droplet to the inner side of the microring, and the inset is a physical diagram of the microring resonator to which the absolute ethyl alcohol droplet has been transferred.
And step four, extracting the graphene oxide dispersion liquid by using a pipettor, gently extruding a drop of graphene oxide aqueous solution droplet, attaching the drop to the absolute ethyl alcohol droplet to be mutually soluble with the absolute ethyl alcohol droplet, and transferring a layer of absolute ethyl alcohol and graphene oxide aqueous dispersion mixed droplet on the inner side of the micro-ring as shown in fig. 4. Fig. 4 is a schematic diagram showing a specific operation of transferring a graphene oxide dispersion to be miscible with an absolute ethyl alcohol droplet on the inner side of a microring, and the inset is a real diagram of a microring resonator transferred with an absolute ethyl alcohol and graphene oxide aqueous solution mixed solution droplet.
And step five, standing and drying at normal temperature for 30min, wherein the recycling flow is driven by the surface tension of the absolute ethyl alcohol and the graphene oxide aqueous dispersion liquid, so that the graphene oxide nanosheets are uniformly dispersed in the mixed solution drops on the inner sides of the microrings, a layer of graphene oxide planar thin film is formed on the surface of the microring resonator after the solvent in the mixed solution drops is naturally evaporated, and the microring resonator of the composite planar graphene oxide film is primarily dried, as shown in fig. 5. Fig. 5 is a schematic diagram of a normal temperature natural evaporation process, and the inset is a real photograph of the micro-ring resonator of the composite planar graphene oxide film after evaporation drying.
And step six, connecting the micro-ring resonator of the primarily dried composite planar graphene oxide film between a broadband light source and a spectrometer, testing the transmission spectrum of the graphene oxide film, and finely adjusting the size and the shape of the micro-ring resonator to enable the graphene oxide film to have the transmission spectrum with a higher extinction ratio.
And seventhly, packaging the microring resonator of the composite planar graphene oxide film on a glass slide by using ultraviolet glue, and drying the glass slide in a clean and closed box for 24 hours to finish the manufacturing of the microring resonator of the composite planar graphene oxide film.
As shown in fig. 6, a microscope picture of the microring resonator compounded with the planar graphene oxide film is shown. As can be seen from the figure, the thickness of the graphene oxide film is uniform, the bonding area of the film and the microring is smooth, and the clustering effect of graphene oxide particles is avoided. As can be seen from fig. 7, the transmission spectrum from the wavelength range of 1540nm to 1570nm has good flatness over a wide wavelength range. The free spectral range of the transmission spectrum of the micro-ring resonator of the composite planar graphene oxide film is 3.56nm, the 3dB bandwidth is 0.297nm, the loss is 2.2dB, and the extinction ratio is 7 dB.
By utilizing the high Q value of the micro-ring resonator of the composite planar graphene oxide film and the saturable absorption effect of the graphene oxide film, the mode-locked fiber laser pulse output with low self-starting mode-locked pumping power and high coherence can be realized. The micro-ring resonator of the composite planar graphene oxide film can generate stable mode-locked output, fig. 8 is the spectral characteristic of the mode-locked fiber laser output, fig. 9 is the output spectrum of the mode-locked fiber laser recorded every 10 minutes within 100 minutes, fig. 10 is the pulse sequence of oscilloscope test, fig. 11 is the spectrometer test, the frequency spectrum range is the radio frequency diagram of 1GHz, fig. 12 is the spectrometer test, and the frequency spectrum range is the radio frequency diagram of 6 kHz. The mode-locked fiber laser realizes the mode-locked output condition with the pumping power of 8mW, the central wavelength is 1562.774nm, the 3dB bandwidth is 0.08nm, the pulse period of a mode-locked pulse sequence is 118.14ns, the repetition frequency is 8.464MHz, the side mode rejection ratio is 60dBm, and the power is 22.74 muW.
Specific example 2
This example is the same as embodiment 1 except that in step one, the double-ended tapered fiber has a diameter of 2 μm and is drawn tight to 2000 μm. And in the second step, the concentration of the graphene oxide dispersion liquid is 0.5 mg/ml. And step five, standing and drying for 20min at normal temperature. And in the seventh step, drying in a closed box for 48 hours.
Specific example 3
This example is the same as embodiment 1 except that in step one, the double-ended tapered fiber is 1 μm in diameter, and is drawn tight to 100 μm. And in the second step, the concentration of the graphene oxide dispersion liquid is 0.8 mg/ml. And step five, standing and drying for 15min at normal temperature. And in the seventh step, drying the mixture in a closed box for 36 hours.
The above is only a preferred embodiment of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (10)
1. A method for manufacturing a micro-ring resonator of a composite planar graphene oxide film is characterized by comprising the following steps: the method comprises the following steps:
tapering a standard single-mode fiber by a fused tapering technology to obtain a double-end tapered fiber, knotting the double-end tapered fiber by a micro-displacement control technology, and tensioning the knotted position by a three-dimensional control platform to obtain a micro-ring resonator;
extracting an absolute ethyl alcohol solution by using a pipettor, extruding an absolute ethyl alcohol droplet, sticking the absolute ethyl alcohol droplet to the middle of the micro-ring, and then removing the absolute ethyl alcohol droplet to form the absolute ethyl alcohol droplet on the inner side of the micro-ring resonator;
taking the graphene oxide dispersion liquid by using a pipettor, and carrying out ultrasonic oscillation for a period of time to ensure that the graphene oxide dispersion liquid is uniformly dispersed;
extracting the uniformly dispersed graphene oxide nanosheet dispersion liquid by using a pipettor, extruding graphene oxide aqueous solution droplets, attaching the graphene oxide aqueous solution droplets to the absolute ethyl alcohol droplets on the inner side of the micro-ring resonator, so that the graphene oxide aqueous solution droplets and the absolute ethyl alcohol droplets are mutually dissolved, and forming a layer of mixed droplets of absolute ethyl alcohol and graphene oxide aqueous dispersion liquid on the inner side of the micro-ring resonator;
standing and drying for a period of time at normal temperature to uniformly disperse the nanosheets in the graphene oxide dispersion liquid in the mixed solution drops on the inner side of the microring resonator, compounding the mixed solution drops with an ethanol solvent to form a layer of graphene oxide planar film on the surface of the microring resonator after the ethanol solvent in the mixed solution drops is naturally evaporated, and preliminarily drying the microring resonator compounded with the planar graphene oxide film;
connecting a micro-ring resonator of the primarily dried composite planar graphene oxide film between a broadband light source and a spectrometer, testing the transmission spectrum of the micro-ring resonator, and improving the extinction ratio of the transmission spectrum by finely adjusting the size and the shape of the micro-ring resonator; and packaging the micro-ring resonator of the composite planar graphene oxide film on a glass slide by using ultraviolet glue, and drying the glass slide in a closed box for a period of time.
2. The method for manufacturing the microring resonator of the composite planar graphene oxide film according to claim 1, wherein the method comprises the following steps: the diameter of the double-end tapered optical fiber is 1-3 μm.
3. The method for manufacturing the microring resonator of the composite planar graphene oxide film according to claim 1, wherein the method comprises the following steps: the circle diameter range of the micro-ring resonator is 100-2000 mu m.
4. The method for manufacturing the microring resonator of the composite planar graphene oxide film according to claim 1, wherein the method comprises the following steps: the concentration of the graphene oxide dispersion liquid is 0.5-1 mg/ml, and the ultrasonic oscillation time is 2 h.
5. The method for manufacturing the microring resonator of the composite planar graphene oxide film according to claim 1, wherein the method comprises the following steps: standing and drying at normal temperature for 15-30 min.
6. The method for manufacturing the microring resonator of the composite planar graphene oxide film according to claim 1, wherein the method comprises the following steps: and drying in the closed box for 24-48 h.
7. A micro-ring resonator of a composite planar graphene oxide film is characterized in that: the micro-ring resonator is prepared by the method for preparing the composite planar graphene oxide film according to any one of claims 1 to 6.
8. A mode-locked fiber laser of a micro-ring resonator composite planar graphene oxide film is characterized in that: including pump light source (1), wavelength division multiplexer (2) input is connected in pump light source (1), erbium-doped gain fiber (3) one end is connected to wavelength division multiplexer (2) output, polarization controller (4) input is connected to erbium-doped fiber (3) other end, isolator (5) input is connected to polarization controller (4) output, isolator (5) output connect claim 7 micro-ring resonator (6) input of compound face form graphene oxide membrane, an input of optical fiber coupler (7) is connected to micro-ring resonator (6) output of compound face form graphene oxide membrane, optical fiber coupler (7) output is connected wavelength division multiplexer (2) input, another output of optical fiber coupler (7) is the output of mode locking fiber laser.
9. The mode-locked fiber laser of the composite planar graphene oxide film of the micro-ring resonator according to claim 8, characterized in that: and the other output end of the optical fiber coupler (7) is connected with a spectrum analyzer, an oscilloscope and a spectrum analyzer.
10. The mode-locked fiber laser of the composite planar graphene oxide film of the micro-ring resonator according to claim 8, characterized in that: the optical fiber coupler is characterized in that the pumping light source (1), the wavelength division multiplexer (2), the erbium-doped gain optical fiber (3), the polarization controller (4), the isolator (5), the micro-ring resonator (6) of the composite planar graphene oxide film and the optical fiber coupler (7) are sequentially connected with one another in an optical fiber fusion mode, and the wavelength division multiplexer (2) is connected with the optical fiber coupler (7) in an optical fiber fusion mode.
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