CN104158074A - Convertible dual-wavelength mode clocking full-fiber laser and production method - Google Patents
Convertible dual-wavelength mode clocking full-fiber laser and production method Download PDFInfo
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Abstract
The invention provides a convertible dual-wavelength mode clocking full-fiber laser and a production method. The convertible dual-wavelength mode clocking full-fiber laser is simple in structure, works stably and is convenient to operate and expected to be widely used in photo-communication, optical sensing and optical detection fields. The laser comprises a wavelength division multiplexer, a doped fiber, an output coupler, a polarization controller, a three-port circulator, a first fiber grating, a second fiber grating and a mode locking device which are connected through a single mode fiber in sequence, wherein the input end of the wavelength division multiplexer is connected with a pump light source; the three-port circulator, the first fiber grating and the second fiber grating constitutes a spectral filtering structure; the convertible and stable dual-wavelength mode locking can be realized between two similar wavelengths. According to the invention, the convertible dual-wavelength mode clocking full-fiber laser and a production method has the advantages that the mode locking operation is stable, the tuning is convenient, the cost is low, and the operation can be conducted at normal temperatures.
Description
Technical field
The present invention relates to a kind of fiber laser system, be specifically related to a kind of convertible dual wavelength mode-locked all-fiber laser and production method.
Background technology
Because full-optical-fiber laser has compact conformation, with low cost, environmental stability advantages of higher, it has obtained studying widely and applying in fields such as optical communication, medical treatment detection, industrial processes.Can there is very important application, such as dense wavelength division multiplexing system, Fibre Optical Sensor and measurement and spectral detection etc. in a lot of fields at the mode-locked all-fiber laser of wavelength.Under some application scenarios, require laser output pulse between two adjacent wavelength, to switch back and forth.
At present, the fiber laser of realizing the output of dual wavelength mode locking pulse has active mode locking technique and two kinds of selections of passive mode locking technology, active mode locking technique has the advantages such as repetition rate is high, line width, but the active modulation device of introducing has destroyed all optical fibre structure, and cost is higher.Passive mode locking technology, as nonlinear loop mirror (NOLM), nonlinear polarization rotation technology (NPR), semiconductor saturable absorbing mirror (SESAM) and the locked mode device based on Single Walled Carbon Nanotube (SWCNT) and Graphene (Graphene), is widely used in the generation of ultrashort pulse.Wherein, because it has lower production cost, the higher advantage such as damage threshold, the recovery time of subpicosecond, carbon nano-tube is regarded as desirable saturable absorption material.Conventionally the spectral filtering effect that, dual wavelength passive mode-locking fiber laser utilizes its chamber type self structure to form realizes the output of dual wavelength or multi-wavelength.In chamber, add polarization to rely on device, as polarization relative photo isolator (PS-ISO), polarization maintaining optical fibre (PMF), polarization beam apparatus (PBS) etc., utilize birefringence to produce filter effect to the impact of polarization state, but its locked mode wavelength location is wayward, and be subject to surrounding environment influence.Gain filter effect based on gain fibre also can realize the running of dual wavelength, but its locked mode wavelength location fixes, and simultaneously very responsive to pump power, its application is very limited.
Summary of the invention
The invention provides one simple in structure, working stability, implements dual wavelength mode-locked all-fiber laser easily, can between two close-spaced wavelengths, realize conversion, and it is expected to be used widely in optical communication, optical sensing, optical detection field.
Technical scheme of the present invention is as follows:
A kind of convertible dual wavelength mode-locked all-fiber laser, comprises the wavelength division multiplexer, doped fiber, output coupler, Polarization Controller, spectral filtering assembly and the locked mode device that are connected to closed loop by monomode fiber; The input of described wavelength division multiplexer connects pump light source; Described spectral filtering assembly is made up of three port circulators, the first fiber grating and the second fiber grating, described three port circulators comprise a end, b end and c end, a end is connected with Polarization Controller, c end is connected with the second fiber grating, b end is connected with the first fiber grating, light enters three port circulators by a port after Polarization Controller is processed, then held the first fiber grating being connected to reflect with b, finally export the second fiber grating to by c port, light transmission the second fiber grating in the second fiber grating bandwidth does not enter locked mode device.
Between above-mentioned device, connect and all adopt monomode fiber welding, described Polarization Controller to be clipped on the monomode fiber between output coupler and three port circulators.
The wavelength-division scope of above-mentioned wavelength division multiplexer is 980nm/1550nm, and above-mentioned pump light source is that operation wavelength is near single mode semiconductor laser 980nm.
The export ratio of above-mentioned output coupler is 10%; Doped fiber is that model is the C300 Er-doped fiber of Coractive.
The centre wavelength of above-mentioned the first fiber grating is 1549.5nm, and reflection bandwidth is 6nm; The first fiber grating is chirp grating optical fiber, and chirp rate is 2nm/cm.
The centre wavelength of above-mentioned the second fiber grating is 1550nm, and reflection bandwidth is 1nm; The second fiber grating is uniform fiber grating.
Above-mentioned locked mode device is the locked mode device based on Single Walled Carbon Nanotube, and its main body is to be mixed the film made from polyvinyl alcohol by Single Walled Carbon Nanotube.
The fine laser generation method of mode-locked all of this convertible dual-wavelength comprises the following steps:
1) light is successively by the wavelength division multiplexer, Er-doped fiber, output coupler, Polarization Controller, three port circulators, the first fiber grating, the second fiber grating and the locked mode device that are connected by monomode fiber;
2) light enters the first fiber grating via three port circulators of Unidirectional, and the light in the first fiber grating reflection bandwidth enters the second fiber grating after by three port circulators;
3) reflectance spectrum of the first fiber grating is divided into I and II two parts;
4) due to the filter effect of the first fiber grating and the formation of the second fiber grating, the light that meets twice spectral filtering can be realized concussion in resonant cavity;
5), in the time that pump power is 13 ± 2mW, laser is realized self-starting mode-lock status at I place conventionally;
6) in the time that pump power exceedes 18 ± 2mW, under the control of Polarization Controller, locked mode centre wavelength realizes conversion at I or II place, and two wavelength place mode-lock status have similar bandwidth, pulse duration and repetition rate, and in stable condition.
The single mode semiconductor laser that above-mentioned pump light source selection work wavelength is 980nm, provides for Er-doped fiber by 980nm/1550nm wavelength division multiplexer; The model of Er-doped fiber is Coractive C300, and at 1550nm place, abbe number is-9ps/nm/km, and length is 5m; The output ratio of output coupler is 10%.
Above-mentioned locked mode is to realize by the saturable absorber based on Single Walled Carbon Nanotube, it makes flow process: after Single Walled Carbon Nanotube aqueous dispersions is mixed with polyvinyl alcohol water solution, drip on surface plate, evaporation is dried and is made film, then film is cut into 2mm
2after size, be clipped between two wire jumper heads, and wire jumper head is fixed with ring flange, make locked mode device.
Advantage of the present invention is as follows:
1, this fiber laser device used is structure fiber laser general-purpose device used, can commercialization, and with low cost.
2, this fiber laser adopts carbon nano-tube as the material of making locked mode device, the advantage such as have that production cost is low, manufacture method is simple, saturation threshold is low and locked mode is stable.
3, this fiber laser has adopted fiber grating as wavelength selector part, has advantages of that output pulse center is Wavelength stabilized.
4, this fiber laser has used chirped fiber grating, introduces very large negative dispersion, and the spectral width and the pulse duration that make to export pulse are constant, are difficult for being affected by the external environment.
5, the realization of this fiber laser convertible dual-wavelength is the reflection based on same fiber grating, can realize at close-spaced wavelength place stable locked mode, and the repetition rate of two wavelength place locked modes is almost identical simultaneously.
6, this fiber laser has adopted all optical fibre structure, therefore its adjustment, good stability of being easy to simple in structure.
7, this erbium doped fiber laser is operated in 1550nm wave band, and therefore correspondence and optical communicating waveband are having very large application prospect aspect optical communication, optical sensing, optical detection.
8, to using fiber grating to carry out after specific selection, can realize convertible dual wavelength and even multi-wavelength locked mode in any desired location.
Brief description of the drawings:
Fig. 1 is structural representation of the present invention;
Fig. 2 is the filtering spectrum figure of two fiber gratings in the present invention;
Fig. 3 is the spectrogram of the present invention at two wavelength place locked modes;
Fig. 4 is the autocorrelator trace figure of the present invention's two wavelength place pulses;
Fig. 5 is the spectrogram of the present invention's two wavelength place pulses;
Fig. 6 is the pulse train at the present invention two wavelength places.
Reference numeral is as follows:
1-pump light source; 2-wavelength division multiplexer; 3-Er-doped fiber; 4-output coupler; 5-Polarization Controller; 6-three port circulators; The 7-the first fiber grating; The 8-the second fiber grating; 9-locked mode device.
Embodiment:
As shown in Figure 1, one provided by the invention is simple in structure, working stability, implements convertible dual-wavelength mode-locked all-fiber laser easily and comprises the wavelength division multiplexer 2, Er-doped fiber 3, output coupler 4, Polarization Controller 5, three port circulators 6, the first fiber grating 7, the second fiber grating 8 and the locked mode device 9 that connect by monomode fiber successively.The single mode semiconductor laser that pump light source 1 selection work wavelength is 980nm, provides pumping by 980nm/1550nm wavelength division multiplexer 2 for Er-doped fiber 3; The model of Er-doped fiber 3 is Coractive C300, and at 1550nm place, abbe number is-9ps/nm/km, and length is 5m; The output ratio of output coupler 4 is 10%.The port a of three port circulators 6 is connected with output coupler 4, and port b is connected with the first fiber grating 7, and port c is connected with the second fiber grating 8, ensures laser Unidirectional simultaneously.The reflection bandwidth of the first fiber grating 7 is 6nm, and centre wavelength is 1549.5nm; The reflection bandwidth of the second fiber grating 8 is 1nm, and centre wavelength is 1550nm.Polarization Controller 5, between output coupler 4 and three port circulators 6, is working standard device.Locked mode device 9 is the saturable absorbers based on Single Walled Carbon Nanotube, and its making flow process is: after Single Walled Carbon Nanotube aqueous dispersions is mixed with polyvinyl alcohol water solution, drip on surface plate, evaporation is dried and made film, then film is cut into 2mm
2after size, be clipped between two wire jumper heads, and wire jumper head is fixed with ring flange, make locked mode device.In device tail optical fiber and chamber, other single-mode optical fiber length are about 28m, and at 1550nm place, abbe number D is about 17ps/nm/km.
In test, use spectroanalysis instrument (YOKOGAWA-6370B) to monitor the spectrum of output pulse, use autocorrelation function analyzer to measure the width of output pulse.Use 10-GHz photodetector that output pulse is converted into after the signal of telecommunication, output pulse sequence and the mode-lock status of observing laser with oscilloscope and spectrum analyzer.
Operation principle of the present invention is as follows:
Fiber laser provided by the invention adopts the locked mode device based on Single Walled Carbon Nanotube to realize self-starting locked mode.The first fiber grating inserts in laserresonator by three port circulators, can play spectral filtering effect, and only the light in its reflection bandwidth can pass through.The light of being exported by three port circulator c ports, by the second fiber grating spectral filtering, only has the not light in its reflection bandwidth to pass through.Because three port circulators only allow Unidirectional, can not in chamber, be transmitted by the light of the second fiber grating reflection.As shown in Figure 2, the reflectance spectrum of the first fiber grating is divided into I and II two parts to the effect of twice spectral filtering, and its 3-dB bandwidth is respectively 2.1nm and 2.9nm.Now, only have the light that simultaneously meets twice spectral filtering in chamber, to transmit, so also form the condition that realizes dual wavelength locked mode, light can be realized locked mode in I or II place respectively.Regulate the linear birefrigence in chamber by Polarization Controller, can between two wavelength, change.
Experimental result of the present invention is as follows:
In the time of the about 13mW of threshold power, laser can be realized self-starting locked mode.Now, be subject to the impact of Er-doped fiber, conventionally first occur mode-lock status at I place.In the time of the about 18mW of power, by regulating Polarization Controller, can between two wavelength, mutually change.Now, as shown in Figure 3, its centre wavelength is respectively 1551.2nm and 1548.6nm to the output spectrum at I and II place, and bandwidth is all in 0.6nm left and right.Be subject to the restriction of narrower filtering spectrum, a side band of two wavelength output spectrums is all suppressed, and makes concentration of energy in pulse.As shown in Figure 4, half peak value full duration of I place output pulse is 8.7ps to the autocorrelator trace of pulse, with hyperbolic secant shape (sech
2) pulse carrys out matching, can obtain pulse duration is 5.7ps; Half peak value full duration of II place output pulse is 9.3ps, with hyperbolic secant shape (sech
2) pulse carrys out matching, can obtain pulse duration is 6ps.Because the first fiber grating is chirped fiber grating, by the very large negative dispersion of the light of its reflection experience, in laser, the spectral bandwidth of pulse and pulse duration are mainly determined by the first chirped fiber grating, and the variation of other parameters is less on its impact.Fig. 5 is the output single pulse train at two wavelength places, and its pulse spacing is respectively 78ns and 83ns.Fig. 6 is the two output 100Hz of pulse of wavelength place and the spectrograms of 1GHz scope, is presented at two wavelength place mode-lock status stable, and its repetition rate is respectively 12.12MHz and 12.11MHz.
In sum, laser provided by the invention has all optical fibre structure, can realize the convertible dual wavelength locked mode of working stability.By rational design, utilize two fiber gratings to locate to realize convertible dual wavelength locked mode at two close-spaced wavelengths (1551.2nm and 1548.6nm).Two wavelength place mode-lock status have similar bandwidth, pulse duration and repetition rate, and in stable condition, are difficult for being affected by the external environment.
Claims (10)
1. a convertible dual wavelength mode-locked all-fiber laser, comprises the wavelength division multiplexer, doped fiber, output coupler, Polarization Controller, spectral filtering assembly and the locked mode device that are connected to closed loop by monomode fiber; It is characterized in that: the input of described wavelength division multiplexer connects pump light source; Described spectral filtering assembly is made up of three port circulators, the first fiber grating and the second fiber grating, described three port circulators comprise a end, b end and c end, a end is connected with Polarization Controller, c end is connected with the second fiber grating, b end is connected with the first fiber grating, light enters three port circulators by a port after Polarization Controller is processed, then held the first fiber grating being connected to reflect with b, finally export the second fiber grating to by c port, light transmission the second fiber grating in the second fiber grating bandwidth does not enter locked mode device.
2. convertible dual wavelength mode-locked all-fiber laser according to claim 1, is characterized in that: between described device, connect and all adopt monomode fiber welding, described Polarization Controller to be clipped on the monomode fiber between output coupler and three port circulators.
3. convertible dual wavelength mode-locked all-fiber laser according to claim 2, is characterized in that: the wavelength-division scope of described wavelength division multiplexer is 980nm/1550nm, and above-mentioned pump light source is that operation wavelength is near single mode semiconductor laser 980nm.
4. convertible dual wavelength mode-locked all-fiber laser according to claim 3, is characterized in that: the export ratio of described output coupler is 10%.
5. convertible dual wavelength mode-locked all-fiber laser according to claim 4, is characterized in that: described doped fiber is that model is the C300 Er-doped fiber of Coractive.
6. convertible dual wavelength mode-locked all-fiber laser according to claim 5, is characterized in that: the centre wavelength of described the first fiber grating is 1549.5nm, reflection bandwidth is 6nm; The first fiber grating is chirp grating optical fiber, and chirp rate is 2nm/cm.
7. convertible dual wavelength mode-locked all-fiber laser according to claim 6, is characterized in that: the centre wavelength of described the second fiber grating is 1550nm, reflection bandwidth is 1nm; The second fiber grating is uniform fiber grating.
8. according to the arbitrary described convertible dual wavelength mode-locked all-fiber laser of claim 1 to 7, it is characterized in that: described locked mode device is the locked mode device based on Single Walled Carbon Nanotube, its main body is to be mixed the film made from polyvinyl alcohol by Single Walled Carbon Nanotube.
9. the fine laser generation method of the mode-locked all of convertible dual-wavelength, is characterized in that, comprises the following steps:
1) light is successively by the wavelength division multiplexer, Er-doped fiber, output coupler, Polarization Controller, three port circulators, the first fiber grating, the second fiber grating and the locked mode device that are connected by monomode fiber;
2) light enters the first fiber grating via three port circulators of Unidirectional, and the light in the first fiber grating reflection bandwidth enters the second fiber grating after by three port circulators;
3) reflectance spectrum of the first fiber grating is divided into I and II two parts;
4) due to the filter effect of the first fiber grating and the formation of the second fiber grating, the light that meets twice spectral filtering can be realized concussion in resonant cavity;
5), in the time that pump power is 13 ± 2mW, laser is realized self-starting mode-lock status at I place;
6) in the time that pump power exceedes 18 ± 2mW, under the control of Polarization Controller, locked mode centre wavelength realizes conversion at I or II place, and two wavelength place mode-lock status have similar bandwidth, pulse duration and repetition rate, and in stable condition.
10. the fine laser generation method of the mode-locked all of convertible dual-wavelength according to claim 9, it is characterized in that: described locked mode is to realize by the saturable absorber based on Single Walled Carbon Nanotube, it makes flow process: after Single Walled Carbon Nanotube aqueous dispersions is mixed with polyvinyl alcohol water solution, drip on surface plate, evaporation is dried and is made film, then film is cut into 2mm
2after size, be clipped between two wire jumper heads, and wire jumper head is fixed with ring flange, make locked mode device.
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Cited By (7)
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| CN104409951A (en) * | 2014-11-21 | 2015-03-11 | 天津大学 | All-optical-fibre mode-locked laser based on Kerr effect of multi-mode interference device |
| CN106129786A (en) * | 2016-07-18 | 2016-11-16 | 电子科技大学 | Tunable dual wavelength mode locked fiber laser based on tapered fiber |
| CN107317219A (en) * | 2017-07-07 | 2017-11-03 | 西北大学 | Dual wavelength pulse optical fiber laser based on rhenium disulfide saturable absorber |
| CN108155556A (en) * | 2017-12-25 | 2018-06-12 | 浙江大学 | A kind of passive mode-locking device of saturated absorbing body formula light and preparation method thereof |
| CN109616861A (en) * | 2019-02-18 | 2019-04-12 | 哈尔滨工程大学 | A kind of preparation method of multi-wavelength optical fiber laser and gold nanoparticle mode-locking device |
| CN111370984A (en) * | 2020-03-20 | 2020-07-03 | 北京工业大学 | Narrow-linewidth nanosecond all-fiber laser amplifier with tunable repetition frequency and pulse width |
| CN115173207A (en) * | 2022-06-24 | 2022-10-11 | 云南师范大学 | Structure for switching laser wavelength based on optical switch and use method |
Family Cites Families (3)
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| CN100534011C (en) * | 2007-03-20 | 2009-08-26 | 中国科学院西安光学精密机械研究所 | Ultranarrow double-channel filter based on symmetric sampling grating structure |
| CN100505442C (en) * | 2007-07-13 | 2009-06-24 | 华中科技大学 | Dual-wavelength single-longitudinal mode optical fiber ring laser device |
| CN103326222A (en) * | 2013-06-28 | 2013-09-25 | 中国科学院西安光学精密机械研究所 | Controllable dual-wavelength mode locking pulse fiber laser device |
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| CN104409951A (en) * | 2014-11-21 | 2015-03-11 | 天津大学 | All-optical-fibre mode-locked laser based on Kerr effect of multi-mode interference device |
| CN104409951B (en) * | 2014-11-21 | 2017-08-04 | 天津大学 | A kind of all -fiber mode-locked laser based on multimode interference couplers Kerr effect |
| CN106129786A (en) * | 2016-07-18 | 2016-11-16 | 电子科技大学 | Tunable dual wavelength mode locked fiber laser based on tapered fiber |
| CN107317219A (en) * | 2017-07-07 | 2017-11-03 | 西北大学 | Dual wavelength pulse optical fiber laser based on rhenium disulfide saturable absorber |
| CN108155556A (en) * | 2017-12-25 | 2018-06-12 | 浙江大学 | A kind of passive mode-locking device of saturated absorbing body formula light and preparation method thereof |
| CN109616861A (en) * | 2019-02-18 | 2019-04-12 | 哈尔滨工程大学 | A kind of preparation method of multi-wavelength optical fiber laser and gold nanoparticle mode-locking device |
| CN109616861B (en) * | 2019-02-18 | 2021-07-13 | 哈尔滨工程大学 | Multi-wavelength fiber laser and preparation method of gold nanoparticle mode locking device |
| CN111370984A (en) * | 2020-03-20 | 2020-07-03 | 北京工业大学 | Narrow-linewidth nanosecond all-fiber laser amplifier with tunable repetition frequency and pulse width |
| CN115173207A (en) * | 2022-06-24 | 2022-10-11 | 云南师范大学 | Structure for switching laser wavelength based on optical switch and use method |
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