CN108649415A - A kind of thulium doped optical fiber laser amplifier - Google Patents
A kind of thulium doped optical fiber laser amplifier Download PDFInfo
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- CN108649415A CN108649415A CN201810466010.2A CN201810466010A CN108649415A CN 108649415 A CN108649415 A CN 108649415A CN 201810466010 A CN201810466010 A CN 201810466010A CN 108649415 A CN108649415 A CN 108649415A
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- thulium doped
- laser amplifier
- doped fiber
- pump light
- wavelength division
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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
-
- 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
- H01S3/06716—Fibre compositions or doping with active elements
-
- 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
- H01S3/06754—Fibre amplifiers
-
- 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
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
- H01S3/094003—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light the pumped medium being a fibre
- H01S3/094007—Cladding pumping, i.e. pump light propagating in a clad surrounding the active core
Abstract
The invention discloses a kind of thulium doped optical fiber laser amplifiers, it includes pumping source, wavelength division multiplexer, thulium doped fiber, Wave decomposing multiplexer, thulium doped fiber is double-clad structure, 2 μm of signal lights that signal source is sent out enter laser amplifier by outside, it is incident to wavelength division multiplexer together with the pump light that pumping source is sent out, after wavelength division multiplexer couples, Wave decomposing multiplexer is transmitted to by thulium doped fiber again, in transmission process, thulium doped fiber absorbs pump light and amplified signal light, and Wave decomposing multiplexer exports remaining pump light and amplified signal light.It is to be appreciated that, thulium doped fiber in laser amplifier provided by the present invention is double-clad structure, readily available higher coupling efficiency, using long optical fibers as gain media, it can inhibit the ASE noises in optical fiber laser amplifier, coordinate suitable pumping source (793nm), you can under the premise of inhibiting ASE noises, reduce gain fibre to short wavelength region (<Effective amplification to 2 μm of signal lights of wide bandwidth is realized in the 1900nm) absorption of signal light.
Description
Technical field
The present invention relates to laser technology fields, more particularly, to a kind of thulium doped optical fiber laser amplifier.
Background technology
At this stage, the lasing light emitter that the output of high efficiency laser can be directly obtained by solid state laser is concentrated mainly on 800nm, 1 μ
M, 1.5 μm and 2 μm.Wherein, 2 mum wavelengths are exactly in the absorption peak of hydrone, also cover numerous molecular fingerprint spectrums,
Have wide practical use in terms of medical treatment and biological study, and in optical communication field, 2 μm of laser of wide bandwidth are highly suitable for
The wavelength-division multiplex (WDM) of multi-wavelength.Extensive use in view of 2 μm of laser in each field, in recent years, 2 μm of optical fiber lasers and
Amplifier has obtained the common concern of people.
Existing fiber laser amplifier usually can inhibit the ASE in laser amplification procedure by increasing the length of optical fiber
(Amplified Spontaneous Emission, amplified spontaneous emission) noise, still, due to the shortwave of 2 μm of broad band lasers
Long region is exactly in the absorption spectra of thulium doped fiber, although increasing the long wavelength region that fiber lengths can be 2 μm of broad band lasers
Additional gain is provided, but also can aggravate gain fibre in turn results in laser amplifier to the absorption in its short wavelength region simultaneously
Gain bandwidth narrow.
Technical staff provides a variety of methods to optimize the gain bandwidth of laser amplifier, but these methods all compare
Complexity also needs to use many additional components, therefore it provides one kind can inhibit ASE using sufficiently long gain fibre to realize,
And it is urgently to be resolved hurrily that can keep the laser amplifier of preferable gain bandwidth.
Invention content
The main purpose of the present invention is to provide a kind of thulium doped optical fiber laser amplifiers, it is intended to how solve by increasing light
Fine length inhibits the ASE noises in laser amplification procedure, and the technical issues of can keep preferable gain bandwidth.
To achieve the above object, the present invention provides a kind of thulium doped optical fiber laser amplifier, which includes pumping
Source, wavelength division multiplexer, thulium doped fiber, Wave decomposing multiplexer；The thulium doped fiber is double-clad structure, using cladding pumping skill
Art；The first end of the wavelength division multiplexer is connect by thulium doped fiber with the Wave decomposing multiplexer；
2 μm of signal lights that signal source is sent out enter laser amplifier, the pump light one sent out with the pumping source by outside
And it is incident to the wavelength division multiplexer；
The wavelength division multiplexer couples the pump light and 2 μm of signal lights, then by after coupling the pump light and
2 μm of signal lights input the thulium doped fiber, the Wave decomposing multiplexer are transmitted to by the thulium doped fiber, in transmission process
In, the thulium doped fiber absorbs the pump light and amplifies 2 μm of signal lights；
The Wave decomposing multiplexer exports remaining pump light and amplified 2 μm of signal lights.
Optionally, the wavelength of pumping source output pump light is one kind in 793nm, 1053nm, 1550nm.
Optionally, the Thulium ion concentration of thulium doped fiber is 8.4 × 1025/m3。
Optionally, the power bracket of pumping source is 0.5~3.5W.
Optionally, the power bracket of signal source is -20dBm~10dBm.
Optionally, ranging from 9~12 μm of the core diameter of thulium doped fiber, ranging from 80~250 μm of cladding diameter, numerical aperture
Diameter ranging from 0.12~0.14.
Optionally, laser amplifier further includes signal source, and the signal source is multiple with the wavelength-division respectively with the pumping source
It is connected with the second end of device, third end, 2 μm of signal lights that the signal source is sent out are distinguished with the pump light that the pumping source is sent out
It is incident to the wavelength division multiplexer by the second end of the wavelength division multiplexer, third end.
Advantageous effect
The present invention provides a kind of thulium doped optical fiber laser amplifier, the laser amplifier include pumping source, wavelength division multiplexer,
Thulium doped fiber, Wave decomposing multiplexer, thulium doped fiber are double-clad structure, using cladding pumping technique, the first of wavelength division multiplexer
End is connected by one end of thulium doped fiber and Wave decomposing multiplexer；2 μm of signal lights that signal source is sent out are put by outside into laser
Big device is incident to wavelength division multiplexer, wavelength division multiplexer coupling pumping light and 2 μm of signals together with the pump light that pumping source is sent out
Light, then by the pump light and 2 μm of signal lights input thulium doped fibers after coupling, Wave decomposing multiplexer is transmitted to by thulium doped fiber,
In transmission process, thulium doped fiber absorbs pump light and amplifies 2 μm of signal lights, and Wave decomposing multiplexer exports remaining pump light and puts
2 μm of signal lights after big.It is to be understood that the thulium doped fiber in laser amplifier provided by the present invention has double clad knot
Structure is pumped using the readily available higher coupling efficiency of cladding pumping compared to fibre core, and the absorption coefficient of cladding pumping is relatively low,
It generally requires and uses longer gain fibre, and using long optical fibers as gain media, it can inhibit in optical fiber laser amplifier just
ASE noises.To 2 μm of broadband thulium doped optical fiber laser amplifier, although ASE can be inhibited by increasing fiber lengths, due to
The increase of fiber lengths, can be more violent to the absorption in the short wavelength region of 2 μm of broadband signal light, and gain bandwidth is caused to narrow.
Coordinate suitable pumping source (793nm), laser amplifier provided by the present invention that can subtract under the premise of inhibiting ASE noises
Small gain fibre to its short wavelength region (<Effective amplification to 2 μm of broadband signal light is realized in absorption 1900nm).
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those skilled in the art without creative efforts, can also basis
These attached drawings obtain other attached drawings.
Fig. 1 is the gain spectral that fibre core pumps that thulium doped optical fiber laser amplifier is obtained based on different length gain fibre；
Fig. 2 is thulium doped optical fiber laser amplifier structural schematic diagram provided by the invention；
Fig. 3 is the cladding pumping schematic diagram that thulium doped optical fiber laser amplifier provided by the invention uses；
Fig. 4 provides thulium doped optical fiber laser amplifier another kind structural schematic diagram for the present invention；
Fig. 5 is Tm in silica fibre3+Energy diagram；
Fig. 6 is Tm in silica fibre3+Absorption and emission cross section spectrum；
Thulium doped optical fiber laser amplifier provided by the invention obtains when Fig. 7 is using 793nm and 1550nm laser as pump light
Gain spectral.
Specific implementation mode
In order to make the invention's purpose, features and advantages of the invention more obvious and easy to understand, below in conjunction with the present invention
Attached drawing in embodiment, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described reality
It is only a part of the embodiment of the present invention to apply example, and not all embodiments.Based on the embodiments of the present invention, people in the art
The every other embodiment that member is obtained without making creative work, shall fall within the protection scope of the present invention.
It is that fibre core pumps TDFA (Thulium-Doped Fiber Amplifier, thulium doped fiber amplification referring to Fig. 1, Fig. 1
Device) the simulation experiment result, specifically, be the obtained TDFA gain spectrals of gain fibre based on different length (1m-5m), should
The fiber core of the used optical fiber of experiment, cladding diameter are respectively 5 μm and 125 μm, and numerical aperture NA is 0.26, in the experiment
In, using the pump mode (i.e. using 1550nm laser as pump light) with inside-pumping, pumping light power is laser amplifier
0.3W, signal light power are -20dBm.According to experimental result it is found that with fiber lengths increase, the transmission loss of optical fiber with
Increase, to almost all of signal light wavelength, gain all decreases.Wherein, short wavelength (<1900nm) under laser gain
It is more more notable than long wavelength laser that speed drops, this is because TDF (Thulium-Doped Fiber, thulium doped fiber) is to short wavelength
Laser has stronger absorption.And near 2 μm, the gain of TDFA then shows the trend gradually increased, and 2m-5m optical fiber is in length
The gain of wavelength region has been more than the optical fiber of 1m.
As it can be seen that can not only inhibit ASE noises using sufficiently long gain fibre, moreover it is possible to be the length of 2 μm of broadband signal light
Wavelength region provides additional gain, but can cause the strong absorption to its short wavelength region in this way, in turn results in gain
Bandwidth narrows, therefore how by the ASE noises in the length inhibition laser amplification procedure of increase optical fiber, and can keep preferably increasing
Beneficial bandwidth is the technical issues of 2 μm of broadband optical fiber laser amplifiers is urgently to be resolved hurrily.
Fig. 2 is a kind of structural schematic diagram of thulium doped optical fiber laser amplifier provided in this embodiment, the thulium doped optical fiber laser
Amplifier includes：Pumping source, wavelength division multiplexer, thulium doped fiber, Wave decomposing multiplexer, in the thulium doped optical fiber laser amplifier, respectively
The connection relation of a device is：The first end of wavelength division multiplexer is connected by one end of thulium doped fiber and Wave decomposing multiplexer.
Thulium doped fiber is double-clad structure in the thulium doped optical fiber laser amplifier, and using cladding pumping technique, which can be found in
The optical link of Fig. 3,2 μm of signal lights and pump light is respectively optical link 1, optical link 2.The thulium doped fiber amplifier when in use,
2 μm of signal lights that signal source is sent out enter laser amplifier by outside, and wavelength-division is incident to together with the pump light that pumping source is sent out
Multiplexer, wavelength division multiplexer coupling pumping light and 2 μm of signal lights, then by after coupling pump light and the input of 2 μm of signal lights mix thulium
Optical fiber is transmitted to Wave decomposing multiplexer by thulium doped fiber, and in transmission process, thulium doped fiber absorbs pump light and amplifies 2 μm of letters
Number light, finally divides two-way to export remaining pump light and amplified 2 μm of signal lights respectively by Wave decomposing multiplexer.
In another example of the present embodiment, laser amplifier further includes signal source, and signal source is distinguished with pumping source
It is connect with the second end of wavelength division multiplexer, third end, shown in Figure 4, the 2 μm of signal lights and pumping source that signal source is sent out at this time
The pump light sent out is incident to wavelength division multiplexer, wavelength division multiplexer coupling by the second end of wavelength division multiplexer, third end respectively
Pump light and 2 μm of signal lights are closed, then by the pump light and 2 μm of signal lights input thulium doped fibers after coupling, are transmitted by thulium doped fiber
To Wave decomposing multiplexer, in transmission process, thulium doped fiber absorbs pump light and amplifies 2 μm of signal lights, is finally demultiplexed by wavelength-division
Two-way is divided to export remaining pump light and amplified 2 μm of signal lights respectively with device.
In the other example of the present embodiment, pumping source export pump light wavelength be 793nm, 1053nm,
One kind in 1550nm；The Thulium ion concentration of thulium doped fiber is 8.4 × 1025/m3；The power bracket of pump light is 0.5~3.5W；
The power bracket of signal light is -20dBm~10dBm；Ranging from 9~12 μm of the core diameter of thulium doped fiber, cladding diameter range
It it is 80~250 μm, range is 0.12~0.14.
It is respectively Tm in silica fibre referring to Fig. 5, Fig. 6, Fig. 5, Fig. 63+Energy diagram and silica fibre in Tm3+Absorption
It is composed with emission cross section.In Figure 5, energy level 1,2,3,4 respectively represents3H6、3F4、3H5、3H4Energy level, not according to pumping level transition
Together, 793nm, 1053nm or 1550nm may be selected in the pumping source of thulium doped optical fiber laser amplifier, corresponds to respectively3H6→3H4,3H6
→3H5And3H6→3F4Pumping level transition, wherein for 2 μm of thulium doped optical fiber laser amplifier, 2 μm of signal lights are put
Come from greatly3F4→3H6Energy level transition, centre wavelength is generally 1.8 μm -2.1 μm.
Fig. 7, which is illustrated, to be incident to thulium doped optical fiber laser provided by the invention with the pump light of 793nm and 1550nm respectively and puts
The gain spectral that big device obtains.In both experiments, it is all made of cladding pumping and identical operating parameters, fibre core, covering
Diameter is respectively 10 μm and 130 μm, and numerical aperture NA is 0.15, and fiber lengths are fixed as 5m, pumping light power 3.5W, 2 μm
Signal light power is -20dBm.Referring to Fig. 7, compared to the thulium doped optical fiber laser amplifier using 1550nm pumpings, using 793nm
Gain of the thulium doped optical fiber laser amplifier of pumping in short wavelength region is significantly increased, so that partly being led with 793nm
Gain bandwidth when volumetric laser is pump light has obtained corresponding broadening, and gain peak ratio at this time uses 1550nm semiconductor lasers
When gain peak be declined slightly.As it can be seen that in an example of the embodiment, coordinate suitable pumping source (793nm), the present invention
The laser amplifier provided can not only inhibit amplified spontaneous emission (ASE) noise, moreover it is possible to reduce 2 μm of broadbands of gain fibre pair
Signal light short wavelength region (<Effective amplification to 2 μm of signal lights of wide bandwidth is realized in absorption 1900nm).
A kind of thulium doped optical fiber laser amplifier is present embodiments provided, since existing optical fiber laser amplifier is amplifying 2 μ
When m signal lights, ASE can be inhibited although increasing the length of gain fibre, due to the increase of fiber lengths, to 2 μm of broadbands
The absorption in the short wavelength region of signal light can be more violent, and gain bandwidth is caused to narrow.And laser amplifier provided by the present invention
Thulium doped fiber in device has double-clad structure, using the readily available higher coupling efficiency of cladding pumping, is pumped compared to fibre core
The absorption coefficient at Pu, cladding pumping is relatively low, generally requires and uses longer gain fibre, and using long optical fibers as gain media, just
It can inhibit the ASE noises in optical fiber laser amplifier well.Coordinate suitable pumping source (793nm), it is provided by the present invention to swash
Image intensifer can under the premise of inhibiting ASE noises, reduce gain fibre to its short wavelength region (<Absorption 1900nm),
Realize effective amplification to 2 μm of broadband signal light.
It should be noted that for each method embodiment above-mentioned, describe, therefore it is all expressed as a series of for simplicity
Combination of actions, but those skilled in the art should understand that, the present invention is not limited by the described action sequence because
According to the present invention, certain steps may be used other sequences or be carried out at the same time.Secondly, those skilled in the art should also know
It knows, embodiment described in this description belongs to preferred embodiment, and involved action and module might not all be this hairs
Necessary to bright.
In the above-described embodiments, it all emphasizes particularly on different fields to the description of each embodiment, there is no the portion being described in detail in some embodiment
Point, the associated description of other embodiments is may refer to, meanwhile, the embodiments of the present invention are for illustration only, do not represent
The quality of embodiment, those skilled in the art under the inspiration of the present invention, are not departing from present inventive concept and right is wanted
It asks under protected ambit, can also make many forms, all of these belong to the protection of the present invention.
Claims (7)
1. a kind of thulium doped optical fiber laser amplifier, which is characterized in that the laser amplifier include pumping source, wavelength division multiplexer,
Thulium doped fiber, Wave decomposing multiplexer；The thulium doped fiber is double-clad structure；The first end of the wavelength division multiplexer is by mixing thulium
Optical fiber is connect with the Wave decomposing multiplexer；
2 μm of signal lights that signal source is sent out enter laser amplifier by outside, and the pump light one sent out with the pumping source is incorporated to
It is incident upon the wavelength division multiplexer；
The wavelength division multiplexer couples the pump light and 2 μm of signal lights, then by the pump light and described 2 after coupling
μm signal light inputs the thulium doped fiber, and the Wave decomposing multiplexer is transmitted to by the thulium doped fiber, in transmission process, institute
Thulium doped fiber is stated to absorb the pump light and amplify 2 μm of signal lights；
The Wave decomposing multiplexer exports remaining pump light and amplified 2 μm of signal lights.
2. laser amplifier as described in claim 1, which is characterized in that the wavelength of pumping source output pump light is
One kind in 793nm, 1053nm, 1550nm.
3. laser amplifier as described in claim 1, which is characterized in that the Thulium ion concentration of the thulium doped fiber be 8.4 ×
1025/m3。
4. laser amplifier as described in claim 1, which is characterized in that the power bracket of the pumping source is 0.5~3.5W.
5. laser amplifier as described in claim 1, which is characterized in that the power bracket of the signal source be -20dBm~
10dBm。
6. laser amplifier as described in any one in claim 1-5, which is characterized in that the laser amplifier further includes signal
Source.The signal source is connect with the second end of the wavelength division multiplexer, third end respectively with the pumping source, the signal source hair
The pump light that 2 μm of signal lights and the pumping source gone out is sent out is entered by the second end of the wavelength division multiplexer, third end respectively
It is incident upon the wavelength division multiplexer.
7. laser amplifier as claimed in claim 6, which is characterized in that the core diameter of the thulium doped fiber ranging from 9~
12 μm, ranging from 80~250 μm of cladding diameter, range is 0.12~0.14.
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| CN201810466010.2A CN108649415B (en) | 2018-05-16 | 2018-05-16 | Thulium-doped optical fiber laser amplifier |
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| CN201810466010.2A CN108649415B (en) | 2018-05-16 | 2018-05-16 | Thulium-doped optical fiber laser amplifier |
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| CN110380325A (en) * | 2019-07-31 | 2019-10-25 | 深圳市镭神智能系统有限公司 | A kind of fiber amplifier |
| CN117579964A (en) * | 2024-01-17 | 2024-02-20 | 中兴通讯股份有限公司 | Optical distribution network, optical distribution system and optical power disturbance method |
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| CN117579964A (en) * | 2024-01-17 | 2024-02-20 | 中兴通讯股份有限公司 | Optical distribution network, optical distribution system and optical power disturbance method |
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| Publication number | Publication date |
|---|---|
| CN108649415B (en) | 2020-04-03 |
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