CN114966976B - Mode-locked fiber laser of micro-ring resonator composite planar graphene oxide film - Google Patents
Mode-locked fiber laser of micro-ring resonator composite planar graphene oxide film Download PDFInfo
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- CN114966976B CN114966976B CN202210460004.2A CN202210460004A CN114966976B CN 114966976 B CN114966976 B CN 114966976B CN 202210460004 A CN202210460004 A CN 202210460004A CN 114966976 B CN114966976 B CN 114966976B
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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
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- 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 utilizes the special two-dimensional plane structure of the micro-ring resonator and the low surface tension characteristic of absolute ethyl alcohol liquid to form absolute ethyl alcohol liquid drops on the inner side of the micro-ring, then the graphene oxide aqueous dispersion liquid and the absolute ethyl alcohol liquid drops 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 manufactured composite planar graphene oxide film. Finally, the invention also discloses a mode-locked fiber laser of the composite planar graphene oxide film of the micro-ring resonator, which comprises a pumping light source, a wavelength division multiplexer, an erbium-doped gain fiber, a polarization controller, an isolator, the micro-ring resonator of the composite planar graphene oxide film and a fiber coupler. The mode-locked fiber laser of the micro-ring resonator composite planar graphene oxide film 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 thus has important application in the fields of quantum optics, fiber parametric oscillators, raman microscopes and the like. The mode of realizing mode locking is divided into 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 spectrum range, good compatibility with the fiber laser and the like, and is widely applied to the fiber laser to realize narrow linewidth laser output.
The currently adopted saturated absorber mainly comprises a semiconductor saturated absorption mirror (SESAM), graphene, transition metal sulfide and the like. The SESAM has been applied to commercial ultrashort pulse fiber lasers, and has the disadvantages of complex manufacturing process, high cost and poor compatibility with a fiber laser resonator. Graphene has broadband saturable absorption characteristics, and has the defects of large unsaturated loss, low modulation depth and low damage threshold. Graphene oxide has saturable absorption characteristics comparable to those of graphene, and has strong hydrophilicity due to the existence of functional groups. In particular, the process for directly preparing the graphene oxide aqueous solution is simpler and lower in cost than graphene. Previous studies have proposed two graphene oxides in combination with fiber lasers as a solution for saturated absorption. A film made of graphene oxide-polyvinyl alcohol mixed solution is arranged on the micron-sized end face of an optical fiber jumper wire to serve as a saturated absorber, and the film is insufficient in damage threshold value, low in tunability and the like of the saturated absorber due to the fact that the heat dissipation of a device is poor, the device is small in plane of action with laser, the thickness is uncontrollable and the like. The other scheme is that graphene oxide and a micro-nano optical fiber are combined to serve as a saturated absorber, and the graphene oxide is transferred and formed into a film on a taper region of the micro-nano optical fiber by a photo-deposition method.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a mode-locked fiber laser with a micro-ring resonator and a 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 invention adopts the following technical scheme:
a method for manufacturing a micro-ring resonator with a composite planar graphene oxide film comprises the following steps:
tapering a standard single-mode fiber by a fusion tapering technology to obtain a double-end tapered fiber, knotting the double-end tapered fiber by a micro-displacement control technology, and tensioning the knotting position by a three-dimensional control platform to obtain a micro-ring resonator;
extracting absolute ethyl alcohol solution by using a pipette, extruding absolute ethyl alcohol liquid drops, attaching the absolute ethyl alcohol liquid drops to the middle of the micro-ring, and then removing the absolute ethyl alcohol liquid drops to form absolute ethyl alcohol liquid drops on the inner side of the micro-ring resonator;
taking graphene oxide dispersion liquid by a liquid shifter, and carrying out ultrasonic oscillation for a period of time to uniformly disperse the graphene oxide dispersion liquid;
extracting uniformly dispersed graphene oxide nanosheet dispersion liquid by using a liquid shifter, extruding graphene oxide aqueous solution droplets, attaching the graphene oxide aqueous solution droplets to 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 absolute ethyl alcohol and graphene oxide aqueous dispersion liquid mixed droplets on the inner side of the micro-ring resonator;
standing and drying at normal temperature for a period of time, so that the nano-sheets in the graphene oxide dispersion liquid are uniformly dispersed in mixed solution drops on the inner side of the micro-ring resonator, and after ethanol solvent in the mixed solution drops is naturally evaporated, a layer of graphene oxide planar film is formed on the surface of the micro-ring resonator in a compounding way, and the micro-ring resonator of the compounded planar graphene oxide film is subjected to primary drying;
the micro-ring resonator of the primarily dried composite planar graphene oxide film is connected between a broadband light source and a spectrometer, the transmission spectrum of the micro-ring resonator is tested, and the extinction ratio of the transmission spectrum of the micro-ring resonator is improved by fine adjustment of 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 utilizing ultraviolet glue, and drying the glass slide in a closed box for a period of time.
The diameter of the double-ended tapered optical fiber is 1-3 μm.
The circle diameter of the micro-ring resonator ranges from 100 μm to 2000 μm.
The concentration of the graphene oxide dispersion liquid is 0.5-1 mg/ml, and the ultrasonic oscillation time is 2 hours.
The standing and drying time at normal temperature is 15-30 min.
The drying time in the closed box is 24-48 h.
A micro-ring resonator of a composite planar graphene oxide film is manufactured by the manufacturing method of the micro-ring 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 an input end of a wavelength division multiplexer, an 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 an input end of a polarization controller, an output end of the polarization controller is connected with an input end of an isolator, the output end of the isolator is connected with an 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 of the mode-locked fiber laser.
And the other output end of the optical fiber coupler is connected with a spectrum analyzer, an oscilloscope and the spectrum analyzer.
The mode-locked fiber laser of the micro-ring resonator composite planar graphene oxide film comprises a pumping light source, a wavelength division multiplexer, an erbium-doped gain fiber, a polarization controller, an isolator, the micro-ring resonator of the composite planar graphene oxide film and an optical fiber coupler which are sequentially connected through an optical fiber welding mode, wherein the wavelength division multiplexer is connected with the optical fiber coupler through the optical fiber welding mode.
The invention has the beneficial effects that: according to the mode-locked fiber laser with the composite planar graphene oxide film of the micro-ring resonator, disclosed by the invention, the micro-ring resonator with the composite planar graphene oxide film is based on a special two-dimensional planar structure of the micro-ring resonator and the surface tension characteristic of liquid, mixed solution drops of absolute ethyl alcohol and graphene oxide aqueous dispersion liquid are transferred to the inner side of a micro-ring, and the surface tension of the mixed solution drops of absolute ethyl alcohol and graphene oxide aqueous dispersion liquid is utilized to drive a recirculating flow, so that graphene oxide nano sheets are uniformly dispersed in the mixed solution drops, and the thickness uniformity and the surface smoothness of the graphene oxide film transferred to the inner side of the micro-ring are ensured; the double-end conical optical fiber is manufactured by adopting a fusion tapering method and the micro-ring resonator is manufactured based on a three-dimensional micro-displacement control method, so that the micro-ring resonator 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 micro-ring resonator has the characteristics of good heat dissipation performance, flat and smooth surface, large plane of action with laser, uniform and controllable thickness and small insertion loss; mode-locked fiber laser based on 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 inhibition ratio.
Drawings
FIG. 1 is a schematic diagram of a mode-locked fiber laser with a micro-ring resonator composite planar graphene oxide film according to the present invention;
FIGS. 2 to 5 are pictures of a process of fabricating a micro-ring resonator of a composite planar graphene oxide film according to the present invention;
FIG. 6 is a microscopic image of a composite planar graphene oxide film microring resonator of the present invention;
FIG. 7 is a transmission spectrum of the composite planar graphene oxide film microring resonator of the present invention from 1540nm to 1570nm wavelength range;
FIG. 8 is a laser spectrum diagram of a mode-locked fiber laser with a wavelength range of 1560nm to 1565nm when the pumping power of the mode-locked fiber laser of the micro-ring resonator composite planar graphene oxide film is 8 mW;
FIG. 9 is a graph of the output spectrum of a mode-locked fiber laser of a microring resonator composite planar graphene oxide film tested within 100 minutes;
FIG. 10 is a pulse sequence diagram of a mode-locked fiber laser of a microring resonator composite planar graphene oxide film of the present invention;
FIG. 11 is a radio frequency spectrum diagram of a mode-locked fiber laser of a micro-ring resonator composite planar graphene oxide film in the 1GHz range of the invention;
FIG. 12 is a graph of the radio frequency spectrum of the mode-locked fiber laser of the composite planar graphene oxide film of the micro-ring resonator in the range of 6 kHz.
Reference numerals in the drawings are as follows: 1-a pump light source; a 2-wavelength division multiplexer; 3-erbium-doped gain fiber; 4-polarization controller; a 5-isolator; 6-a micro-ring resonator of the composite planar graphene oxide film; 7-optical fiber coupler.
Detailed Description
The present invention is further described below, and the following examples are only for more clearly illustrating the technical solution of the present invention, but are not to be construed as limiting the scope of the present invention.
Example 1
As shown in fig. 1, the invention provides a mode-locked fiber laser of a micro-ring resonator composite planar graphene oxide film, which comprises a pumping light source 1, a wavelength division multiplexer 2, an erbium-doped gain fiber 3, a polarization controller 4, an isolator 5, a micro-ring resonator 6 of the composite planar graphene oxide film and an optical fiber coupler 7. The pumping 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 optical fiber 3, the other end of the erbium-doped optical 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 the spectrum analyzer. All the devices are connected with each other in turn through an optical fiber fusion welding mode.
As shown in fig. 2 to 5, the schematic diagram of the fabrication process of the micro-ring resonator of the composite planar graphene oxide film is shown, and the illustration is a physical diagram of the fabrication device in the corresponding process. The manufacturing method comprises the following steps:
step one, 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, and then the knot is slowly tensioned 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 graphene oxide dispersion transferred, and an illustration is a physical diagram of the fabricated microring resonator.
And secondly, taking graphene oxide dispersion liquid with the concentration of 1mg/ml by using a liquid transfer device, and carrying out ultrasonic oscillation on the graphene oxide dispersion liquid for 2 hours to uniformly disperse the graphene oxide dispersion liquid.
And thirdly, extracting the absolute ethyl alcohol solution by using a pipette, lightly extruding a drop of the absolute ethyl alcohol, attaching the drop to the middle of the micro-ring, and then removing the drop, wherein the drop of the absolute ethyl alcohol is transferred to 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 of a specific operation of transferring an absolute ethyl alcohol droplet to the inner side of a micro-ring, and an illustration is a physical diagram of a micro-ring resonator having transferred an absolute ethyl alcohol droplet.
And fourthly, extracting graphene oxide dispersion liquid by using a liquid transfer device, slightly extruding a drop of graphene oxide aqueous solution, attaching the drop to the absolute ethyl alcohol drop, and transferring a layer of mixed drop of absolute ethyl alcohol and graphene oxide aqueous dispersion liquid inside the micro-ring as shown in fig. 4. Fig. 4 is a schematic diagram showing a specific operation of transferring graphene oxide dispersion liquid to be mutually dissolved with anhydrous ethanol droplets on the inner side of a micro-ring, and an illustration is a physical diagram of a micro-ring resonator transferred with mixed solution droplets of anhydrous ethanol and graphene oxide aqueous solution.
And fifthly, standing and drying for 30 minutes at normal temperature, wherein the absolute ethyl alcohol and the surface tension of the graphene oxide aqueous dispersion liquid drive a recycling flow, so that graphene oxide nano sheets are uniformly dispersed in mixed solution drops on the inner side of the micro-ring, and a layer of graphene oxide planar film is formed by compositing on the surface of the micro-ring resonator after the solvent in the mixed solution drops is naturally evaporated, and the micro-ring resonator of the composite planar graphene oxide film is subjected to primary drying, as shown in fig. 5. Fig. 5 is a schematic diagram of a natural evaporation process at normal temperature, and an illustration is a physical photograph of a 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 micro-ring resonator, and enabling the micro-ring resonator to have the transmission spectrum with higher extinction ratio through micro-adjustment of the size and the morphology of the micro-ring resonator.
And step seven, packaging the micro-ring resonator of the composite planar graphene oxide film on a glass slide by utilizing ultraviolet glue, and drying the glass slide in a clean and airtight box for 24 hours to finish the manufacturing of the micro-ring resonator of the composite planar graphene oxide film.
As shown in fig. 6, a microscopic physical image of the micro-ring resonator of the composite planar graphene oxide film is shown. The graph shows that the thickness of the graphene oxide film is uniform, the bonding area of the film and the micro-ring is smooth, and the cluster effect of graphene oxide particles is avoided. As can be seen from fig. 7, the transmission spectrum from 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 7dB.
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 can be utilized to realize the mode-locked fiber laser pulse output with low self-starting mode-locked pumping power and high coherence. The micro-ring resonator of the composite planar graphene oxide film can generate stable mode-locked output, fig. 8 is a spectrum characteristic of the mode-locked fiber laser output, fig. 9 is an output spectrum of the mode-locked fiber laser recorded once every 10 minutes within 100 minutes, fig. 10 is a pulse sequence of an oscilloscope test, fig. 11 is a spectrometer test, a radio frequency chart of a spectrum range of 1GHz, fig. 12 is a spectrometer test, and a radio frequency chart of a spectrum range of 6 kHz. The mode-locked fiber laser has a mode-locked output condition realized by pumping power of 8mW, a central wavelength of 1562.774nm, a 3dB bandwidth of 0.08nm, a pulse period of a mode-locked pulse sequence of 118.14ns, a repetition frequency of 8.464MHz, a side mode rejection ratio of 60dBm and a power of 22.74 mu W.
Example 2
This example is identical to example 1, except that in step one, the double-ended tapered fiber is 2 μm in diameter and is drawn to 2000 μm. The concentration of the graphene oxide dispersion in the second step is 0.5mg/ml. And step five, standing and drying for 20min at normal temperature. And step seven, drying in a sealed box for 48 hours.
Example 3
This example is identical to example 1, except that in step one, the double-ended tapered fiber is 1 μm in diameter and is drawn to 100 μm. The concentration of the graphene oxide dispersion in the second step is 0.8mg/ml. And step five, standing and drying for 15min at normal temperature. And step seven, drying the mixture for 36 hours in a closed box.
The foregoing is only a preferred embodiment of the invention, it being 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 present invention, and such modifications and adaptations are intended to be comprehended within the scope of the invention.
Claims (10)
1. A method for manufacturing a micro-ring resonator with 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 fusion tapering technology to obtain a double-end tapered fiber, knotting the double-end tapered fiber by a micro-displacement control technology, and tensioning the knotting position by a three-dimensional control platform to obtain a micro-ring resonator;
extracting absolute ethyl alcohol solution by using a pipette, extruding absolute ethyl alcohol liquid drops, attaching the absolute ethyl alcohol liquid drops to the middle of the micro-ring, and then removing the absolute ethyl alcohol liquid drops to form absolute ethyl alcohol liquid drops on the inner side of the micro-ring resonator;
taking graphene oxide dispersion liquid by a liquid shifter, and carrying out ultrasonic oscillation for a period of time to uniformly disperse the graphene oxide dispersion liquid;
extracting uniformly dispersed graphene oxide nanosheet dispersion liquid by using a liquid shifter, extruding graphene oxide aqueous solution droplets, attaching the graphene oxide aqueous solution droplets to 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 absolute ethyl alcohol and graphene oxide aqueous dispersion liquid mixed droplets on the inner side of the micro-ring resonator;
standing and drying at normal temperature for a period of time, so that the nano-sheets in the graphene oxide dispersion liquid are uniformly dispersed in mixed solution drops on the inner side of the micro-ring resonator, and after ethanol solvent in the mixed solution drops is naturally evaporated, a layer of graphene oxide planar film is formed on the surface of the micro-ring resonator in a compounding way, and the micro-ring resonator of the compounded planar graphene oxide film is subjected to primary drying;
the micro-ring resonator of the primarily dried composite planar graphene oxide film is connected between a broadband light source and a spectrometer, the transmission spectrum of the micro-ring resonator is tested, and the extinction ratio of the transmission spectrum of the micro-ring resonator is improved by fine adjustment of 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 utilizing ultraviolet glue, and drying for a period of time in a closed box.
2. The method for manufacturing the micro-ring resonator with the composite planar graphene oxide film according to claim 1, wherein the method comprises the following steps: the diameter of the double-ended tapered optical fiber is 1-3 μm.
3. The method for manufacturing the micro-ring resonator with the composite planar graphene oxide film according to claim 1, wherein the method comprises the following steps: the circle diameter of the micro-ring resonator ranges from 100 μm to 2000 μm.
4. The method for manufacturing the micro-ring resonator with 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 hours.
5. The method for manufacturing the micro-ring resonator with the composite planar graphene oxide film according to claim 1, wherein the method comprises the following steps: the standing and drying time at normal temperature is 15-30 min.
6. The method for manufacturing the micro-ring resonator with the composite planar graphene oxide film according to claim 1, wherein the method comprises the following steps: the drying time in the closed box is 24-48 h.
7. A micro-ring resonator of a composite planar graphene oxide film is characterized in that: the micro-ring resonator manufactured by the manufacturing method of 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: the optical fiber coupler comprises a pumping light source (1), wherein the pumping light source (1) is connected with the input end of a wavelength division multiplexer (2), the output end of the wavelength division multiplexer (2) is connected with one end of an erbium-doped gain optical fiber (3), the other end of the erbium-doped gain optical fiber (3) is connected with the input end of a polarization controller (4), the output end of the polarization controller (4) is connected with the input end of an isolator (5), the output end of the isolator (5) is connected with the input end of a micro-ring resonator (6) of the composite planar graphene oxide film according to claim 7, the output end of the micro-ring resonator (6) of the composite planar graphene oxide film is connected with one input end of an 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 a mode-locked fiber laser.
9. The mode-locked fiber laser of the micro-ring resonator composite planar graphene oxide film of claim 8, wherein: the other output end of the optical fiber coupler (7) is connected with a spectrum analyzer, an oscilloscope and the spectrum analyzer.
10. The mode-locked fiber laser of the micro-ring resonator composite planar graphene oxide film of claim 8, wherein: 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 through an optical fiber welding mode, and the wavelength division multiplexer (2) and the optical fiber coupler (7) are connected through an optical fiber welding mode.
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