CN208173996U - A kind of Tunable Multi-wavelength Fiber Laser - Google Patents
A kind of Tunable Multi-wavelength Fiber Laser Download PDFInfo
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- CN208173996U CN208173996U CN201820596886.4U CN201820596886U CN208173996U CN 208173996 U CN208173996 U CN 208173996U CN 201820596886 U CN201820596886 U CN 201820596886U CN 208173996 U CN208173996 U CN 208173996U
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Abstract
The utility model discloses a kind of Tunable Multi-wavelength Fiber Laser, the optical fiber laser includes pump laser, wavelength division multiplexer, gain fibre, Polarization Controller, optical fiber filter and photo-coupler, constitutes a resonant cavity of fibre-optical laser between each device by way of fiber coupling.Pump laser is connected through wavelength division multiplexer with gain fibre, gain fibre output end is sequentially connected Polarization Controller, optical fiber filter and photo-coupler, by adjusting Polarization Controller, incident light has different polarization states, the heterogeneity of the intracavitary polarization state of laser resonance is enhanced after optical fiber filter, to generate polarization hole burning in the gain medium, inhibit intracavity modal competition, and then obtains the tunable multiwavelength laser output of Polarization Control.Using with all -fiber, small in size, structure is simple, low cost, low-loss high birefringence micro-nano fiber are used as modeling unit, realize low-loss, stabilization, laser of narrowband export.
Description
Technical field
The utility model relates to a kind of Tunable Multi-wavelength Fiber Lasers, belong to fiber laser technology field.
Background technique
Recently, optical fiber laser is because of characteristics such as its all -fiber, high efficiency, length flexibles, by fiber optic communication, Fibre Optical Sensor
And the favor in the cutting edge technologies such as spectrum analysis field, have become the research hotspot in solid state laser field.Particularly, wavelength-division
Multiplexing (WDM) technology, which becomes, currently meets the key of fiber optic communication large-capacity communication demand, and tunable multi-wavelength optical-fiber laser
Light source of the device as optical fiber WDM communication system has extremely important research and application value.
Early stage realizes laser multi-wavelength tunable mainly by the way that F-P cavity, dielectric film are added in laser resonant cavity
Filter and acousto-optic filter equiwavelength's tuned element.However, these free space tuning devices are generally non-optical fiber structure,
Insertion loss is larger, reduces the efficiency, integrated level and compactedness of laser.In the recent period, people use all-fiber filter, such as：
Fiber bragg grating, high birefringence (HiBi) Sagnac interferometer, high non-linear photon crystal optical fiber etc. are used as tuned cell.
Wherein, relatively high using long-period fiber grating as the tunable fiber grating cost of manufacture of representative, and by fiber grating itself
The limitation of emergent property, wavelength tuning range are smaller.High birefringence (HiBi) Sagnac interferometer is as comb filter to more
When wavelength carries out frequency-selecting, interference ring volume is not larger easy of integration, and the influence vulnerable to external environment, as caused by the factors such as strain
The change of ring-shaped is easy that output state is made to change.High non-linear photon crystal optical fiber can make the energy at own excitation wavelength
It measures to conversion at non-excitation wavelength to realize that multi-wavelength exports, but this kind of laser resonant cavity chamber is longer, structure is not compact,
And the splice loss, splice attenuation of photonic crystal fiber is relatively large.
Therefore, study and realize that a kind of all -fiber, high stability, low cost, compact-sized, Insertion Loss be small and the big model of wavelength
Tunable multi-wavelength optical fiber laser is enclosed with important research and application value.
Utility model content
The disadvantages of the utility model is high, stability is poor, compactedness is low, tuning range is small for prior art cost of manufacture,
Propose a kind of Tunable Multi-wavelength Fiber Laser.
The purpose of this utility model will be realized through the following technical scheme：A kind of tunable multi-wavelength optical-fiber laser
Device, the optical fiber laser include pump laser, wavelength division multiplexer, gain fibre, Polarization Controller, optical fiber filter and optocoupler
Clutch constitutes a resonant cavity of fibre-optical laser, the pump laser warp between each device by way of fiber coupling
Wavelength division multiplexer is connected with gain fibre, and gain fibre output end is sequentially connected Polarization Controller, optical fiber filter and optical coupling
Device, the output end of the pump laser are connected with the input terminal of wavelength division multiplexer, and the output end of wavelength division multiplexer passes through gain
Optical fiber is connected with the input terminal of Polarization Controller, and the output end of Polarization Controller passes through the input of optical fiber filter and photo-coupler
End is connected.
Preferably, the optical fiber filter is Lyot type optical fiber filter, has the function of wavelength tuning, the optical fiber filter
Including optoisolator and high birefringence micro-nano fiber, the output end of Polarization Controller is connected with the input terminal of optoisolator, light every
Output end from device is connected by high birefringence micro-nano fiber with the input terminal of photo-coupler.
Preferably, resonant cavity of fibre-optical laser is realized by high birefringence micro-nano fiber in the resonant cavity of fibre-optical laser
Interior laser modeling.
Preferably, the high birefringence micro-nano fiber is made of high-birefringence polarisation-maintaining optical fiber fused biconical taper, bores light using drawing
Mode-interference in fibre carries out the selection of laser intracavity modal.
Preferably, the high birefringence micro-nano fiber is distributed with non-circular symmetrical refraction rate, the high birefringence micro-nano light
Fibre includes silica-base material region and stressed zone.
Preferably, light field excites multiple modes, including basic mode and high-order in high birefringence micro-nano fiber in transmission process
Mode, and there are different effective refractive indexs, as fibre diameter becomes smaller, more and more higher order modes are ended, finally only HE11
Mould, TE01Mould and TM01Mould can pass through uniform lumbar region, and in TE01Mould and TM01The interference spectrum with modeling effect is formed between mould.
Preferably, TE01Mould and TM01The normalized output luminous intensity T of mould can be expressed as：
WhereinIt is TE01And TM01Between phase difference, λ is wavelength, Δ L=l (n1-n2) it is TE01And TM01
Between optical path difference, by their effective refractive index (n1And n2) and polarization maintaining optical fibre cone waist length l determine.
Preferably, the pump laser is semiconductor laser.
The advantages of technical solutions of the utility model, is mainly reflected in：The optical fiber laser use with all -fiber, it is small in size,
Structure is simple, low cost, low-loss high birefringence micro-nano fiber are used as modeling unit, and it is sharp to realize low-loss, stabilization, narrowband
Light output, wherein high birefringence micro-nano fiber is bored by high-birefringence polarisation-maintaining optical fiber drawing, dry using the mode in tapered fiber
It relates to and carries out the selection of laser intracavity modal.
High birefringence micro-nano fiber and polarization relationship type optoisolator are bonded the filter of Lyot type optical fiber by the technical program
Wave device, introduces polarisation hole-burning effect, and narrowband wide range of wavelengths tunable laser spectroscopy can be obtained in adjustment Polarization Controller.
The a wide range of multi-wavelength tunable in narrowband is built and realized to the optical fiber laser using all-fiber devices, has coherence
Good, the features such as wave frequency and number are tunable, stability is high, compact-sized, at low cost, easy realization.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of Tunable Multi-wavelength Fiber Laser of the utility model.
Fig. 2 is the schematic cross-section of high birefringence micro-nano fiber in the utility model.
Fig. 3 is Three models structural schematic diagram present in high birefringence micro-nano fiber in the utility model.
Fig. 4 is the related using high birefringence micro-nano fiber structure combination polarization of spectrometer test acquisition in the utility model
Type optoisolator constitutes Lyot type optical fiber filter and carries out the Single wavelength tunable laser light that zlasing mode selection and control obtain
Spectrogram.
Fig. 5 is the related using high birefringence micro-nano fiber structure combination polarization of spectrometer test acquisition in the utility model
Type optoisolator constitutes Lyot type optical fiber filter and carries out the dual-wavelength tunable laser light that zlasing mode selection and control obtain
Spectrogram.
Fig. 6 is the related using high birefringence micro-nano fiber structure combination polarization of spectrometer test acquisition in the utility model
Type optoisolator constitutes Lyot type optical fiber filter and carries out three wavelength and four Wavelength tunables that zlasing mode selection and control obtain
Humorous laser light spectrogram.
When Fig. 7 is that the laser output Single wavelength that experiment test obtains in the utility model is located at 1561.66nm, do not changing
In the case where the state and the pump power that become Polarization Controller, the signal of laser output was measured in one hour every 15 minutes
Figure.
Specific embodiment
The purpose of this utility model, advantage and feature will carry out figure by the non-limitative illustration of preferred embodiment below
Show and explains.These embodiments are only the prominent examples using technical solutions of the utility model, all to take equivalent replacement or wait
Effect transformation and formed technical solution, all fall within the requires of the utility model protection within the scope of.
The utility model discloses a kind of Tunable Multi-wavelength Fiber Laser, as shown in Figure 1, the optical fiber laser includes
Pump laser 1, wavelength division multiplexer 2, gain fibre 3, Polarization Controller 4, optical fiber filter 5 and photo-coupler 6, each device
Between a resonant cavity of fibre-optical laser is constituted by way of fiber coupling, in the technical scheme, the pump laser 1
Preferably semiconductor laser.
As shown in Figure 1, the pump laser 1 is connected through wavelength division multiplexer 2 with gain fibre 3, gain fibre output end
It is sequentially connected Polarization Controller 4, optical fiber filter 5 and photo-coupler 6, the output end and wavelength division multiplexer of the pump laser
Input terminal be connected, the output end of wavelength division multiplexer is connected by gain fibre with the input terminal of Polarization Controller, Polarization Control
The output end of device is connected by optical fiber filter with the input terminal of photo-coupler, and by adjusting Polarization Controller, incident light has
Different polarization states enhances the heterogeneity of the intracavitary polarization state of laser resonance after optical fiber filter, thus in gain
Polarization hole burning is generated in medium, inhibits intracavity modal competition, and then obtains the tunable multiwavelength laser output of Polarization Control.
The optical fiber filter is Lyot type optical fiber filter, has the function of wavelength tuning, which includes light
Isolator 51 and high birefringence micro-nano fiber 52, the optoisolator 51 are polarization relationship type optoisolator, Polarization Controller
Output end is connected with the input terminal of optoisolator, and the output end of optoisolator passes through high birefringence micro-nano fiber and photo-coupler
Input terminal is connected.It is realized in resonant cavity of fibre-optical laser and is swashed by high birefringence micro-nano fiber in the resonant cavity of fibre-optical laser
Light modeling.
Light field excites multiple modes in high birefringence micro-nano fiber in transmission process, specifically include basic mode and high-order mode
Formula, and have different effective refractive indexs, as fibre diameter becomes smaller, optical fiber by draw cone attenuate reach some size when, increasingly
More higher order modes are ended, in mode it is also fewer and fewer, final only remaining Three models, final only HE11Mould, TE01Mould
With TM01Mould can pass through uniform lumbar region, and in TE01Mould and TM01The interference spectrum with modeling effect is formed between mould.
High birefringence micro-nano fiber structure is equipped in the resonant cavity of fibre-optical laser of the utility model, as shown in Fig. 2, described
High birefringence micro-nano fiber is made of high-birefringence polarisation-maintaining optical fiber fused biconical taper, and it is non-circular right that the high birefringence micro-nano fiber has
Claim index distribution, carries out the selection of laser intracavity modal using the mode-interference in tapered fiber.After fused biconical taper, polarization maintaining optical fibre
Bore lumbar region diameter be about 2.66 μm, core diameter due to draw cone become very little, so stressed zone has only been drawn in Fig. 2 and without fibre
Core can be at this point, air and the high-birefringence polarisation-maintaining optical fiber after cone is drawn to constitute the bigger new multi-mode wave guiding structure of refringence
Accommodate multiple higher order modes.When polarization maintaining optical fibre diameter further decreases, more higher order modes are ended, and leave less low order
Mould is interfered.At this point, high birefringence micro-nano fiber structural model includes two parts, silica-base material in high birefringence micro-nano fiber
Stressed zone 8 in region 7, high birefringence micro-nano fiber.
As shown in figure 3, in the high birefringence micro-nano fiber, there are Three models：HE11Mould 9, TE01Mould 10 and TM01Mould
11, but it is based on HE11Mould and TE01Mould, TM01The fact that the equal noenergy of mould exchanges, it is known that interference is in TE01Mould and TM01
Intermode generates, so can establish following interference theory model：
TE01Mould and TM01The normalized output luminous intensity T of mould can be expressed as：
WhereinIt is TE01And TM01Between phase difference, λ is wavelength, Δ L=l (n1-n2) it is TE01And TM01
Between optical path difference, by their effective refractive index (n1And n2) and polarization maintaining optical fibre cone waist length l determine.
High birefringence micro-nano fiber structure used by the utility model is bored by high-birefringence polarisation-maintaining optical fiber drawing, is utilized
Mode-interference in tapered fiber carries out the selection of laser intracavity modal, and by high birefringence micro-nano fiber and polarization relationship type light every
It is bonded Lyot type optical fiber filter from device, when adjusting Polarization Controller, incident light has different polarization states, by the filter
The heterogeneity of the intracavitary polarization state of laser resonance is enhanced after wave device, to generate polarization hole burning in the gain medium, is inhibited
Intracavity modal competition, and then obtain the tunable multiwavelength laser output of Polarization Control.
Fig. 4 polarizes relationship type optoisolator structure using the combination of high birefringence micro-nano fiber structure for what spectrometer test obtained
Zlasing mode selection is carried out at Lyot type optical fiber filter and controls obtained narrowband Single wavelength tunable laser spectroscopy figure, in figure
Ordinate is pump power, and abscissa is wavelength, it is seen that pump power is 25mW at this time, exports laser three dB bandwidth
Less than 0.05nm, side mode suppression ratio reaches as high as 53dB.
Fig. 5 is the dual-wavelength laser output spectrum that the technical program experiment test obtains, and ordinate is pump power in figure,
Abscissa is wavelength.Fig. 6 is three wavelength and four wavelength laser output spectrums that the technical program experiment test obtains, and indulges and sits in figure
It is designated as pump power, abscissa is wavelength.
When Fig. 7 is that the laser output Single wavelength that the technical program experiment test obtains is located at 1561.66nm, do not changing
In the case where the state and pump power of Polarization Controller, in one hour every measured in one hour 15 minutes laser output,
Stability with higher.
The wavelength tuning function of the optical fiber laser is made of high birefringence micro-nano fiber and polarization relationship type optoisolator
Lyot type optical fiber filter realize, adjust Polarization Controller, incident light has different polarization states, after the filter
The heterogeneity of the intracavitary polarization state of laser resonance is enhanced, to generate polarization hole burning in the gain medium, inhibits intracavitary mould
Formula competition, and then obtain the tunable multiwavelength laser output of Polarization Control.
The optical fiber laser is used with all -fiber, small in size, structure is simple, inexpensive, low-loss high birefringence is micro-
Nano fiber realizes low-loss, stabilization, laser of narrowband output as modeling unit, and combines polarization relationship type optoisolator structure
At Lyot type optical fiber filter, the tunable full optical fiber laser output of stabilization, wave frequency, number is realized.
Still there are many embodiment, all technologies formed using equivalents or equivalent transformation for the utility model
Scheme is all fallen within the protection scope of the utility model.
Claims (8)
1. a kind of Tunable Multi-wavelength Fiber Laser, it is characterised in that：Including pump laser, wavelength division multiplexer, gain light
Fibre, Polarization Controller, optical fiber filter and photo-coupler constitute an optical fiber between each device by way of fiber coupling
Laser resonant cavity, the pump laser are connected through wavelength division multiplexer with gain fibre, and gain fibre output end is sequentially connected
Polarization Controller, optical fiber filter and photo-coupler, the input terminal phase of the output end and wavelength division multiplexer of the pump laser
Even, the output end of wavelength division multiplexer is connected by gain fibre with the input terminal of Polarization Controller, the output end of Polarization Controller
It is connected by optical fiber filter with the input terminal of photo-coupler.
2. a kind of Tunable Multi-wavelength Fiber Laser according to claim 1, it is characterised in that：The optical fiber filter
For Lyot type optical fiber filter, has the function of wavelength tuning, which includes optoisolator and high birefringence micro-nano light
Fibre, the output end of Polarization Controller are connected with the input terminal of optoisolator, and the output end of optoisolator passes through high birefringence micro-nano
Optical fiber is connected with the input terminal of photo-coupler.
3. a kind of Tunable Multi-wavelength Fiber Laser according to claim 2, it is characterised in that：The optical fiber laser
Laser modeling in resonant cavity of fibre-optical laser is realized by high birefringence micro-nano fiber in resonant cavity.
4. a kind of Tunable Multi-wavelength Fiber Laser according to claim 2, it is characterised in that：The high birefringence is micro-
Nano fiber is made of high-birefringence polarisation-maintaining optical fiber fused biconical taper, carries out laser intracavity modal using the mode-interference in tapered fiber
Selection.
5. a kind of Tunable Multi-wavelength Fiber Laser according to claim 2, it is characterised in that：The high birefringence is micro-
Nano fiber is distributed with non-circular symmetrical refraction rate, and the high birefringence micro-nano fiber includes silica-base material region (7) and stressed zone
(8)。
6. a kind of Tunable Multi-wavelength Fiber Laser according to claim 5, it is characterised in that：Light field is in high birefringence
Multiple modes, basic mode and higher order mode are excited in micro-nano fiber in transmission process, and there are different effective refractive indexs, with optical fiber
Diameter becomes smaller, and more and more higher order modes are ended, finally only HE11Mould, TE01Mould and TM01Mould can pass through uniform lumbar region, and
In TE01Mould and TM01The interference spectrum with modeling effect is formed between mould.
7. a kind of Tunable Multi-wavelength Fiber Laser according to claim 6, it is characterised in that：
TE01Mould and TM01The normalized output luminous intensity T of mould can be expressed as：
WhereinIt is TE01And TM01Between phase difference, λ is wavelength, Δ L=l (n1-n2) it is TE01And TM01Between
Optical path difference, by their effective refractive index n1And n2It is determined with the length l of polarization maintaining optical fibre cone waist.
8. a kind of Tunable Multi-wavelength Fiber Laser according to claim 1, it is characterised in that：The pump laser
For semiconductor laser.
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| CN112838466A (en) * | 2019-11-25 | 2021-05-25 | 北京交通大学 | Switchable and tunable multi-wavelength fiber laser |
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| CN112838466A (en) * | 2019-11-25 | 2021-05-25 | 北京交通大学 | Switchable and tunable multi-wavelength fiber laser |
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