CN104158074B - A kind of mode-locked all fibre laser generation method of convertible dual-wavelength - Google Patents
A kind of mode-locked all fibre laser generation method of convertible dual-wavelength Download PDFInfo
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- CN104158074B CN104158074B CN201410347599.6A CN201410347599A CN104158074B CN 104158074 B CN104158074 B CN 104158074B CN 201410347599 A CN201410347599 A CN 201410347599A CN 104158074 B CN104158074 B CN 104158074B
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Abstract
The present invention provides a kind of simple in construction, working stability, convertible dual-wavelength mode-locked all-fiber laser easy to implement and production method, is expected to be used widely in optic communication, optical sensing, field of optical detection.The laser includes wavelength division multiplexer, doped fiber, output coupler, Polarization Controller, three port circulators, the first fiber grating, the second fiber grating and the mode-locking device for passing sequentially through single-mode fiber connection, wherein the input connection pump light source of the wavelength division multiplexer.The spectral filtering structure of wherein three port circulators, the first fiber grating and the second fiber grating composition, realizes convertible, stable dual wavelength locked mode at two close-spaced wavelengths.The optical fiber laser and production method have the advantages of locked mode is stable, tuning is convenient, cost is cheap, normal temperature operating.
Description
Technical field
The present invention relates to a kind of fiber laser system, and in particular to a kind of convertible dual wavelength mode-locked all-fiber laser
And production method.
Background technology
Because full-optical-fiber laser has the advantages that compact-sized, cost is cheap, environmental stability is high, its optic communication,
The fields such as medical detection, industrial processes are extensively studied and applied.It can swash in the mode-locked all fibre of wavelength
Light device suffers from very important application, such as dense wavelength division multiplexing system, Fibre Optical Sensor and measurement, Yi Jiguang in many fields
Spectrum detection etc..Under some application scenarios, it is desirable to which laser output pulse can toggle between two adjacent wavelength.
At present, realizing the optical fiber laser of dual wavelength mode locking pulse output has active mode locking technique and passive mode-locking technology two
Kind selection, active mode locking technique has the advantages that repetition rate height, line width, but the active modulation device introduced destroys full light
Fine structure, and cost is higher.Passive mode-locking technology such as nonlinear loop mirror (NOLM), nonlinear polarization rotation technology (NPR), half
Conductor saturable absorbing mirror (SESAM) and the mode locker based on single-walled carbon nanotube (SWCNT) and graphene (Graphene)
Part, it is widely used in the generation of ultrashort pulse.Wherein, because it has relatively low production cost, higher damage threshold, sub- skin
The advantages that recovery time of second, CNT is seen as preferable saturable absorption material.Generally, dual wavelength passive mode-locking optical fiber
The spectral filtering effect that laser is formed using its lumen type self structure realizes the output of dual wavelength or multi-wavelength.Added in intracavitary
Polarization independent device, related optoisolator (PS-ISO), polarization maintaining optical fibre (PMF), polarization beam apparatus (PBS) are such as polarized, using double
Reflect the influence to polarization state and produce filter effect, but its locked mode wavelength location is difficult to control, and easily by surrounding environment shadow
Ring.Gain filter effect based on gain fibre can also realize the operating of dual wavelength, but its locked mode wavelength location is fixed, simultaneously
Very sensitive to pump power, its application is very limited.
The content of the invention
The present invention provides a kind of simple in construction, working stability, and dual wavelength mode-locked all-fiber laser easy to implement can
Conversion is realized between two close-spaced wavelengths, it is expected to be used widely in optic communication, optical sensing, field of optical detection.
Technical scheme is as follows：
A kind of convertible dual wavelength mode-locked all-fiber laser, including be connected as by single-mode fiber the wavelength-division of closed loop and answer
With device, doped fiber, output coupler, Polarization Controller, spectral filtering component and mode-locking device；The wavelength division multiplexer it is defeated
Enter end connection pump light source；The spectral filtering component is by three port circulators, the first fiber grating and the second fiber grating group
Into three port circulator includes a ends, b ends and c ends, and a ends are connected with Polarization Controller, and c ends connect with the second fiber grating
Connect, b ends are connected with the first fiber grating, and light enters three port circulators after Polarization Controller is handled by a ports, then by with
Connected the first fiber grating reflection in b ends, is finally exported to the second fiber grating, not in the second fiber grating bandwidth by c ports
Interior light enters mode-locking device through the second fiber grating.
Connected between above-mentioned device and use single-mode fiber welding, the Polarization Controller is clipped in output coupler and three ports
On single-mode fiber between circulator.
The wavelength-division scope of above-mentioned wavelength division multiplexer is 980nm/1550nm, and above-mentioned pump light source is that operation wavelength is 980nm
Neighbouring single mode semiconductor laser.
The export ratio of above-mentioned output coupler is 10%；Doped fiber is model Coractive C300 er-doped light
It is fine.
The centre wavelength of above-mentioned first fiber grating is 1549.5nm, reflection bandwidth 6nm；First fiber grating is chirp
Grating fibers, chirp rate 2nm/cm.
The centre wavelength of above-mentioned second fiber grating is 1550nm, reflection bandwidth 1nm；Second fiber grating is uniform light
Fine grating.
Above-mentioned mode-locking device is the mode-locking device based on single-walled carbon nanotube, and its main body is by single-walled carbon nanotube and poly- second
The film that enol is mixed.
The mode-locked all fibre laser generation method of the convertible dual-wavelength comprises the following steps：
1) light is passed sequentially through by the wavelength division multiplexer of single-mode fiber connection, Er-doped fiber, output coupler, Polarization Control
Device, three port circulators, the first fiber grating, the second fiber grating and mode-locking device；
2) light enters the first fiber grating via three port circulators of Unidirectional, in the first fiber grating reflection bandwidth
Light by entering the second fiber grating after 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 that the first fiber grating and the second fiber grating are formed, the luminous energy of spectral filtering twice is met
It is enough that concussion is realized in resonator；
5) when pump power is 13 ± 2mW, laser generally realizes self-starting modelocking state at I；
6) when pump power is more than 18 ± 2mW, under the control of Polarization Controller, locked mode centre wavelength is at I or II
Conversion is realized, and mode-lock status has similar bandwidth, pulse width and repetition rate at two wavelength, and it is in stable condition.
Above-mentioned pump light source selection work wavelength is 980nm single mode semiconductor laser, passes through 980nm/1550nm ripples
Division multiplexer provides for Er-doped fiber；The model Coractive C300 of Er-doped fiber, at 1550nm abbe number for-
9ps/nm/km, length 5m；The output of output coupler is compared for 10%.
Above-mentioned locked mode is realized by the saturable absorber based on single-walled carbon nanotube, and its Making programme is：Will be single
Wall carbon nano tube aqueous dispersions are dripped after being well mixed with polyvinyl alcohol water solution on surface plate, and film is made in evaporation drying, so
Film is cut into 2mm afterwards2It is clipped in after size between two wire jumper heads, and wire jumper head is fixed with ring flange, mode-locking device is made.
Advantages of the present invention is as follows：
1st, device used in the optical fiber laser is the general-purpose device used in construction optical fiber laser, can commercialization, cost is low
It is honest and clean.
2nd, the optical fiber laser using CNT as make mode-locking device material, have production cost it is low, making
The advantages that method is simple, saturation threshold is low and locked mode is stable.
3rd, the optical fiber laser employs fiber grating as wavelength selecting device, has output pulse center Wavelength stabilized
The advantages of.
4th, the optical fiber laser has used chirped fiber grating, introduces very big negative dispersion, makes the spectral width of output pulse
It is constant with pulse width, it is not easy to be affected by the external environment.
5th, the realization of the optical fiber laser convertible dual-wavelength is the reflection based on same fiber grating, can be in close ripple
Strong point realizes stable locked mode, at the same at two wavelength locked mode repetition rate it is almost identical.
6th, the optical fiber laser employs all optical fibre structure, thus its it is simple in construction be easy to adjust, stability is good.
7th, the erbium doped fiber laser is operated in 1550nm wave bands, correspondence and optical communicating waveband, therefore in optic communication, optics
There is very big application prospect in terms of sensing, optical detection.
8th, after to carrying out specific selection using fiber grating, convertible dual wavelength can be realized in any required position
Or even multi-wavelength locked mode.
Brief description of the drawings：
Fig. 1 is the 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 present invention locked mode at two wavelength；
Fig. 4 is the autocorrelator trace figure of pulse at two wavelength of the invention；
Fig. 5 is the spectrogram of pulse at two wavelength of the invention；
Fig. 6 is the pulse train at two wavelength of the invention.
Reference 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；7-the first fiber grating；8-the second fiber grating；9-mode-locking device.
Embodiment：
As shown in figure 1, one kind provided by the invention is simple in construction, and working stability, convertible dual-wavelength easy to implement lock
Mould full-optical-fiber laser include pass sequentially through single-mode fiber connection wavelength division multiplexer 2, Er-doped fiber 3, output coupler 4, partially
Shake controller 5, three port circulators 6, the first fiber grating 7, the second fiber grating 8 and mode-locking device 9.Pump light source 1 is selected
Operation wavelength is 980nm single mode semiconductor laser, is that Er-doped fiber 3 provides by 980nm/1550nm wavelength division multiplexers 2
Pumping；The model Coractive C300 of Er-doped fiber 3, abbe number is -9ps/nm/km, length 5m at 1550nm；
The output of output coupler 4 is compared for 10%.The port a of three port circulators 6 is connected with output coupler 4, port b and the first light
Fine grating 7 is connected, and port c is connected with the second fiber grating 8, while ensures laser Unidirectional.First fiber grating 7 it is anti-
Penetrate with a width of 6nm, centre wavelength 1549.5nm；The reflection bandwidth of second fiber grating 8 is 1nm, centre wavelength 1550nm.
Polarization Controller 5 is working standard device between the port circulator 6 of output coupler 4 and three.Mode-locking device 9 is based on single
The saturable absorber of wall carbon nano tube, its Making programme are：By single-walled carbon nanotube aqueous dispersions and polyvinyl alcohol water solution
Dripped after well mixed on surface plate, film is made in evaporation drying, and film then is cut into 2mm2Two wire jumpers are clipped in after size
Between head, and wire jumper head is fixed with ring flange, mode-locking device is made.Device tail optical fiber and intracavitary other single-mode optical fiber lengths are about
28m, abbe number D is about 17ps/nm/km at 1550nm.
The spectrum of output pulse is monitored in experiment using spectroanalysis instrument (YOKOGAWA-6370B), uses autocorrelation function analyzer
The width of measurement output pulse.It will be exported after pulse is converted into electric signal using 10-GHz photodetectors, with oscillograph and frequency
Compose the output pulse sequence and mode-lock status of analyzer observation laser.
Operation principle of the present invention is as follows：
Optical fiber laser provided by the invention realizes self-starting modelocking using the mode-locking device based on single-walled carbon nanotube.The
One fiber grating inserts laser resonance intracavitary by three port circulators, can play spectral filtering effect, only be reflected at it
Light in bandwidth can pass through.By the light of three port circulator c ports output by the second fiber grating spectral filtering, only do not exist
Light in its reflection bandwidth can pass through.Because three port circulators only allow Unidirectional, by the reflection of the second fiber grating
Light can not transmit in intracavitary.The effect of spectral filtering is as shown in Fig. 2 the reflectance spectrum of the first fiber grating is divided into I He twice
II two parts, its 3-dB bandwidth is respectively 2.1nm and 2.9nm.Now, only meet that the light of spectral filtering twice can be simultaneously
Intracavitary is transmitted, and so also forms the condition for realizing dual wavelength locked mode, and light can realize locked mode at I or II respectively.Pass through polarization
Linear birefrigence in controller adjusting cavity, it can be changed between two wavelength.
The experimental result of the present invention is as follows：
As threshold power about 13mW, laser can realize self-starting modelocking.Now, influenceed, led to by Er-doped fiber
Often occurs mode-lock status first at I., can phase between two wavelength by adjusting Polarization Controller as power about 18mW
Mutually conversion.Now, the output spectrum at I and II is as shown in figure 3, its centre wavelength is respectively 1551.2nm and 1548.6nm, band
Width is all in 0.6nm or so.Limited by narrower filtering spectrum, the side sideband of two wavelength output spectrums is all suppressed, and is enabled
Amount is concentrated in pulse.The autocorrelator trace of pulse as shown in figure 4, the full width half maximum that pulse is exported at I is 8.7ps, with
Hyperbolic secant shape (sech2) pulse is fitted, can to obtain pulse width be 5.7ps；Half peak value overall with of pulse is exported at II
Spend for 9.3ps, with hyperbolic secant shape (sech2) pulse is fitted, can to obtain pulse width be 6ps.Due to the first optical fiber light
Grid are chirped fiber grating, and the light being reflected off undergoes very big negative dispersion, the in the laser spectral bandwidth of pulse and pulse
Width mainly determines by the first chirped fiber grating, and the change of other specification influences smaller on it.Fig. 5 is the output at two wavelength
Single pulse train, its pulse spacing are respectively 78ns and 83ns.Fig. 6 is 100Hz the and 1GHz scopes that pulse is exported at two wavelength
Spectrogram, be shown at two wavelength that mode-lock status is stable, and its repetition rate is respectively 12.12MHz and 12.11MHz.
In summary, laser provided by the invention has all optical fibre structure, can realize the convertible of working stability
Dual wavelength locked mode.By reasonably designing, using two fiber gratings at two close-spaced wavelengths (1551.2nm and 1548.6nm)
Realize convertible dual wavelength locked mode in place.Mode-lock status has similar bandwidth, pulse width and repetition rate at two wavelength, and
It is in stable condition, it is not easy to be affected by the external environment.
Claims (2)
1. the mode-locked all fibre laser generation method of a kind of convertible dual-wavelength, it is characterised in that comprise the following steps：
1) light is passed sequentially through by the wavelength division multiplexer of single-mode fiber connection, Er-doped fiber, output coupler, Polarization Controller, three
Port circulator, the first fiber grating, the second fiber grating and mode-locking device；
2) light enters the first fiber grating via three port circulators of Unidirectional, the light in the first fiber grating reflection bandwidth
By entering the second fiber grating after 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 that the first fiber grating and the second fiber grating are formed, meet that the light of spectral filtering twice can be
Concussion is realized in resonator；
5) when pump power is 13 ± 2mW, laser realizes self-starting modelocking state at I；
6) when pump power is more than 18 ± 2mW, under the control of Polarization Controller, locked mode centre wavelength is realized at I or II
Conversion, and mode-lock status has similar bandwidth, pulse width and repetition rate at two wavelength, and it is in stable condition.
2. the mode-locked all fibre laser generation method of convertible dual-wavelength according to claim 1, it is characterised in that：It is described
Locked mode is realized by the saturable absorber based on single-walled carbon nanotube, and its Making programme is：By single-walled carbon nanotube water
Dispersion liquid is dripped after being well mixed with polyvinyl alcohol water solution on surface plate, and film is made in evaporation drying, is then cut into film
2mm2It is clipped in after size between two wire jumper heads, and wire jumper head is fixed with ring flange, mode-locking device is made.
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN107317219B (en) * | 2017-07-07 | 2019-12-24 | 西北大学 | Dual-wavelength pulse 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 |
| 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 |
| CN115173207B (en) * | 2022-06-24 | 2023-04-07 | 云南师范大学 | Structure for switching laser wavelength based on optical switch and use method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101022314A (en) * | 2007-03-20 | 2007-08-22 | 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 |
| CN101132109A (en) * | 2007-07-13 | 2008-02-27 | 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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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101022314A (en) * | 2007-03-20 | 2007-08-22 | 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 |
| CN101132109A (en) * | 2007-07-13 | 2008-02-27 | 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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