CN106253042B - Broadband tunable pulse fiber laser based on supercontinuum light source - Google Patents
Broadband tunable pulse fiber laser based on supercontinuum light source Download PDFInfo
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- CN106253042B CN106253042B CN201610919861.9A CN201610919861A CN106253042B CN 106253042 B CN106253042 B CN 106253042B CN 201610919861 A CN201610919861 A CN 201610919861A CN 106253042 B CN106253042 B CN 106253042B
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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
- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
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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
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/106—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity
- H01S3/108—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity using non-linear optical devices, e.g. exhibiting Brillouin or Raman scattering
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Abstract
A broadband tunable pulse fiber laser based on a supercontinuum light source comprises a pumping source for outputting pumping light, wherein an optical fiber isolator, a power amplifier, a first lens coupler, a high nonlinear optical fiber, a second lens coupler, a mid-infrared beam splitter, a spectrometer and a filtering module are sequentially arranged on the right side of the horizontal direction of an emergent optical axis of the pumping light; the invention has simple structure, small volume, wider tunable wave band of laser and high tuning speed, reduces the manufacturing process difficulty and the production cost, and can be popularized and applied to high-capacity optical fiber communication.
Description
Technical Field
The invention belongs to the technical field of lasers, and particularly relates to a broadband tunable pulse fiber laser based on a supercontinuum light source.
Background
With the rapid development of technology, high-capacity optical fiber communication has become a trend. The development of Wavelength Division Multiplexing (WDM) technology and Optical Time Division Multiplexing (OTDM) technology currently provides technical support for optical fiber communication, but it has been very difficult to further expand the communication capacity based on either technology, and if the two technologies can be combined, a larger communication capacity can be achieved, and in such a system, a multi-wavelength ultrashort optical pulse source is required to be used as the emission light source of the system. The broadband tunable ultrashort light pulse based on the supercontinuum light source can generate the multi-wavelength ultrashort light pulse in a wider spectral range, and can completely cover near infrared and middle infrared bands. It plays an important role in future high capacity fiber optic communications.
Conventional several wavelength tunable lasers include: tunable passive mode-locked fiber lasers, bragg reflection lasers, distributed feedback lasers, and the like based on fiber nonlinear effects; for the above lasers, the tunable wavelength range is narrower, the optical path is very complex, the operation is complex, the packaging mode and the process are complex, some of the lasers are also affected by the external temperature, the cost in the manufacturing process is high, and the manufacturing and the application of the tunable lasers are greatly limited.
Disclosure of Invention
The technical problem to be solved by the invention is to overcome the defects, and provide the broadband tunable pulse fiber laser based on the supercontinuum light source, which has the advantages of reasonable design, simple structure, convenient operation, low cost and capability of realizing the output of the tunable laser pulse with a wider broadband.
The technical scheme adopted for solving the technical problems is as follows: an optical fiber isolator, a power amplifier, a first lens coupler, a high nonlinear optical fiber, a second lens coupler, a middle infrared beam splitter, a spectrometer and a filter module are sequentially arranged on the right side of the horizontal direction of the pump light emergent optical axis;
the power amplifier amplifies and outputs pumping laser;
the high nonlinear optical fiber is used for generating a flat supercontinuum light source;
the first lens coupler enables the common single-mode light and the high nonlinear optical fiber to realize low-loss coupling; the second lens coupler realizes low-loss coupling output of the broadband light source;
the mid-infrared beam splitter outputs about 1% of detection output to the spectrum detector for detection, and the rest light passes through the filtering module to generate pulse laser output with required wavelength.
The pump source of the invention is a fiber laser with the wavelength of 2 mu m.
The pump source of the invention is a thulium-doped fiber laser with the wavelength of 2 mu m.
The highly nonlinear optical fiber of the present invention is a microstructured sulfide optical fiber.
The first lens coupler and the second lens coupler of the invention are infrared NA matched lenses in GaF 2.
The filter module comprises a first collimating lens, a diffraction grating, a second collimating lens and a light shielding plate, wherein the diffraction grating is obliquely arranged on the right side of the horizontal direction of a light emergent optical axis of the first collimating lens, the second collimating lens is arranged under the diffraction grating, and the light shielding plate is arranged under the second collimating lens; the upper surface of the light shielding plate is coated with light absorbing substances and is provided with a circular through hole.
The power amplifier comprises a semiconductor laser, an optical fiber beam combiner and a gain optical fiber, wherein the optical fiber beam combiner and the gain optical fiber are sequentially arranged on the right side of the semiconductor laser.
The gain fiber of the invention is a rare earth doped double clad fiber.
The invention adopts the structure that the optical fiber isolator, the power amplifier, the first lens coupler, the high-nonlinearity optical fiber, the second lens coupler, the mid-infrared beam splitter, the spectrometer and the filter module are sequentially arranged on the right side of the horizontal direction of the pump light emergent optical axis, the first lens coupler enables the common single-mode light and the high-nonlinearity optical fiber to realize low-loss coupling, the flat mid-infrared supercontinuum broadband light source can be obtained due to the adoption of the high-nonlinearity optical fiber, the second lens coupler realizes the low-loss coupling output of the broadband light source, and simultaneously combines the filter module, the diffraction angle beta is changed by changing the size of the incident angle alpha through rotating the diffraction grating, so that the wavelength separation of various broadband light sources compounded by different wavelengths after grating diffraction is realized, the light output of the wavelength corresponding to the circular through hole position of the light shielding plate is realized, the wide-band tunable pulse laser output is realized, and the wide-band tunable pulse laser based on the supercontinuum light source is realized.
Drawings
Fig. 1 is a schematic diagram of the structure of an embodiment of the present invention.
Fig. 2 is a schematic diagram of the structure of the filtering module 12 in fig. 1.
FIG. 3 is a fitted dispersion curve for a microstructured sulfide optical fiber according to example 1 of the present invention.
In the figure: 1. a pump source; 2. an optical fiber isolator; 3. a semiconductor laser; 4. an optical fiber combiner; 5. a gain fiber; 6. a power amplifier; 7. a first lens coupler; 8. a highly nonlinear optical fiber; 9. a second lens coupler; 10. a middle infrared beam splitter; 11. a spectrometer; 12. a filtering module; 121. a first collimating lens; 122. a diffraction grating; 123. a second collimating lens; 124. a light shielding plate.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, but the present invention is not limited to these examples.
Example 1
In fig. 1, the present invention comprises a pump source 1 for outputting pump light, the pump source 1 of this embodiment is a fiber laser of 2 μm wavelength, preferably a thulium doped fiber laser, for achieving a zero dispersion wavelength matching with a highly nonlinear fiber 8. An optical fiber isolator 2, a power amplifier 6, a first lens coupler 7, a high nonlinear optical fiber 8, a second lens coupler 9, a middle infrared beam splitter 10, a spectrometer 11 and a filter module 12 are sequentially arranged on the right side of the horizontal direction of the pump light emergent optical axis; the optical fiber isolator 2 eliminates the additional noise generated by backward transmission light and can prevent the damage to a front-stage system caused by the laser reflection after power amplification, the specification of the optical fiber isolator 2 is a 2 mu m optical fiber Faraday optical fiber type isolator, the laser passing through the optical fiber isolator 2 enters the power amplifier 6 for power amplification and output, the power amplifier 6 comprises a semiconductor laser 3, an optical fiber beam combiner 4 and a gain optical fiber 5, the right side of the semiconductor laser 3 is sequentially provided with the optical fiber beam combiner and the gain optical fiber 5, the gain optical fiber 5 is a rare earth doped double-clad optical fiber, the laser output by the power amplifier 6 passes through the first lens coupler 7 to realize low-loss coupling with the high-nonlinearity optical fiber 8, further, the high-nonlinearity optical fiber 8 of the embodiment is a microstructure sulfide optical fiber due to controllable dispersion and higher nonlinearity coefficient, the flat mid-infrared supercontinuum broadband light source with the bandwidth of 1-5 μm can be generated, fig. 3 is a fitting dispersion curve of the microstructure sulfide optical fiber of the embodiment, the zero dispersion wavelength is about 2 μm, the laser wavelength output by the pump source 1 is 2 μm, the fitting dispersion curve can be well matched with the zero dispersion wavelength of the high-nonlinearity optical fiber 8, the output spectrum is greatly widened based on the combined action of the high-nonlinearity coefficient of the high-nonlinearity optical fiber 8 and various nonlinear effects such as self-phase modulation, cross-phase modulation, stimulated raman scattering, four-wave mixing and the like, the laser center wavelength output by the pump source 1 is matched with the zero dispersion wavelength of the high-nonlinearity optical fiber 8, the mid-infrared supercontinuum broadband light source with the flat bandwidth of 1-5 μm is obtained, the low-loss coupling output of the broadband light source is realized by the second lens coupler 9, further, the first lens coupler 7 and the second lens coupler 9 of the embodiment are infrared NA matched lenses in GaF2, so that the low-loss coupling between the common single-mode optical fiber and the high-nonlinearity optical fiber is realized; the broadband light source obtained by the front-stage system is subjected to detection output of about 1% through the middle infrared beam splitter 10, and enters the spectrometer 11 for detection, and the rest of light is transmitted through the filtering module 12 to realize the broadband adjustable pulse laser.
In fig. 2, the filter module 12 of the present embodiment includes a first collimating lens 121, a diffraction grating 122, a second collimating lens 123, and a light shielding plate 124, wherein the diffraction grating 122 is obliquely disposed on the right side of the first collimating lens 121 in the horizontal direction of the light outgoing optical axis, the second collimating lens 123 is disposed under the diffraction grating 122, and the light shielding plate 124 is disposed under the second collimating lens 123; the upper surface of the light shielding plate 124 is coated with a light absorbing material and provided with a circular through hole, the broadband light source collimates and projects light onto the diffraction grating 122 through the collimating lens 121, light with different wavelengths can be separated through the action of the diffraction grating 122, then light is collimated through the collimating lens 123, finally the light with separated wavelengths is projected onto different positions of the light shielding plate 124 provided with the circular through hole, and the positions of the light shielding plate 124 except the circular through hole are coated with the light absorbing material, so that only laser with the wavelength corresponding to the position of the circular through hole can be output, and light with other wavelengths is absorbed. The angle of incidence of the light beam collimated by the first collimating lens 121 and the diffraction grating 122 is α, the diffraction angle of the light beam diffracted by the diffraction grating 122 is β, the angle of incidence α and the diffraction angle β satisfy the grating equation d (sin α±sin β) =mλ, where d is a grating constant, λ is a wavelength, m is a spectrum progression, where m=1 is taken, the angle of incidence α is changed by rotating the diffraction grating 122, so as to change the diffraction angle β, so that wavelength separation of various broadband light sources compounded by different wavelengths after diffraction by the grating is realized, so that the wavelength corresponds to the light output of the circular through hole position of the light shielding plate 124, and a broadband tunable pulse laser output is realized.
The working principle of the invention is as follows:
by adopting the device of the embodiment 1 of the invention, the pump source 1 outputs laser with the wavelength of 2 mu m, the laser is transmitted to the power amplifier 6 after passing through the optical fiber isolator 2, the power amplifier 6 is used for amplifying and outputting the power, the laser output by the power amplifier 6 is transmitted through the first lens coupler 7 to realize low-loss coupling with the high-nonlinearity optical fiber 8 to obtain a flat mid-infrared supercontinuum broadband light source, wherein the high-linearity optical fiber 8 is a microstructure sulfide optical fiber, the second lens coupler 9 is used for realizing low-loss coupling output of the broadband light source, the obtained broadband light source outputs about 1 percent of detection output to the spectrometer 11 for detection through the mid-infrared beam splitter 10, the rest of light is transmitted through the filter module 12, the broadband light source enables light to be collimated and projected onto the diffraction grating 122 through the collimating lens 121, the light with different wavelengths is separated through the action of the diffraction grating 122, then the light is collimated by the collimating lens 123, finally the light with separated wavelength is projected to different positions of the light shielding plate 124 provided with the circular through hole, because the positions of the light shielding plate 124 except the circular through hole are coated with light absorbing substances, only the wavelength laser corresponding to the position of the circular through hole can be output, the light with other wavelengths can be absorbed, and the light with other wavelengths is known by a grating equation d (sin alpha + -sin beta) =mλ, wherein d is a grating constant, λ is a wavelength, α is an incident angle, β is a diffraction angle, m is a spectrum progression, m=1 is taken, the magnitude of the incident angle α is changed by rotating the diffraction grating 122 so as to change the diffraction angle β, the wavelength separation of the broadband light source compounded with various different wavelengths after diffraction by the grating is realized, the light with the wavelength corresponding to the position of the circular through hole of the light shielding plate 124 is output, realize a tunable pulse laser output in a broadband.
Claims (5)
1. The utility model provides a broadband tunable pulse fiber laser based on supercontinuum light source, includes the pumping source that is used for the output pumping light, its characterized in that: an optical fiber isolator, a power amplifier, a first lens coupler, a high nonlinear optical fiber, a second lens coupler, a middle infrared beam splitter, a spectrometer and a filter module are sequentially arranged on the right side of the horizontal direction of the pump light emergent optical axis;
the power amplifier amplifies and outputs pumping laser;
the high nonlinear optical fiber is used for generating a flat supercontinuum light source;
the first lens coupler enables the common single-mode light and the high nonlinear optical fiber to realize low-loss coupling; the second lens coupler realizes low-loss coupling output of the broadband light source;
the middle infrared beam splitter outputs about 1% of detection output to the spectrum detector for detection, and the rest light passes through the filtering module to further generate pulse laser output with required wavelength;
the pump source is a fiber laser with the wavelength of 2 mu m;
the filter module comprises a first collimating lens, a diffraction grating, a second collimating lens and a light shielding plate, wherein the diffraction grating is obliquely arranged on the right side of the horizontal direction of the light emergent optical axis of the first collimating lens, the second collimating lens is arranged under the diffraction grating, and the light shielding plate is arranged under the second collimating lens; the upper surface of the light shielding plate is coated with light absorbing substances and provided with circular through holes;
the power amplifier comprises a semiconductor laser, an optical fiber beam combiner and a gain optical fiber, wherein the optical fiber beam combiner and the gain optical fiber are sequentially arranged on the right side of the semiconductor laser.
2. The supercontinuum light source-based broadband tunable pulse fiber laser according to claim 1, wherein: the pump source is a thulium-doped fiber laser with the wavelength of 2 mu m.
3. The supercontinuum light source-based broadband tunable pulse fiber laser according to claim 2, wherein: the high-nonlinearity optical fiber is a microstructure sulfide optical fiber.
4. A supercontinuum light source-based broadband tunable pulsed fiber laser according to claim 3, characterized by: the first lens coupler and the second lens coupler are infrared NA matched lenses in GaF 2.
5. The supercontinuum light source-based broadband tunable pulse fiber laser according to claim 1, wherein: the gain fiber is a rare earth doped double-clad fiber.
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| CN106410579B (en) * | 2016-11-24 | 2018-11-13 | 电子科技大学 | A kind of ultra wide band mid-infrared light fibre Superfluorescence device |
| CN106872402A (en) * | 2017-03-22 | 2017-06-20 | 河北大学 | Gas-detecting device and method based on super continuous spectrums laser |
| CN108512020B (en) * | 2017-09-22 | 2019-06-25 | 中国人民解放军国防科技大学 | Incoherent super-continuum spectrum light source with controllable spectrum and tunable output power |
| ES2712323A1 (en) * | 2017-11-07 | 2019-05-10 | Univ Miguel Hernandez | LASER SYSTEM WITH TUNED DIGITAL SPECTRUM (Machine-translation by Google Translate, not legally binding) |
| CN108666858A (en) * | 2018-04-24 | 2018-10-16 | 上海理工大学 | A kind of multi-wavelength femtosecond Raman fiber lasers |
| CN111638192B (en) * | 2020-06-08 | 2021-11-12 | 南京大学 | Tunable pumping-detection system based on super-continuum spectrum light source |
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| TWI474060B (en) * | 2013-06-18 | 2015-02-21 | Nat Univ Tsing Hua | Supercontinuum generation system |
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