CN104466634B - A kind of linear cavity doped fiber laser - Google Patents
A kind of linear cavity doped fiber laser Download PDFInfo
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- CN104466634B CN104466634B CN201410687280.8A CN201410687280A CN104466634B CN 104466634 B CN104466634 B CN 104466634B CN 201410687280 A CN201410687280 A CN 201410687280A CN 104466634 B CN104466634 B CN 104466634B
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Abstract
The invention discloses a kind of linear cavity doped fiber laser, including tunable filter (2), first speculum (1), power equalization wave filter (3), doped fiber (4), pump signal wave multiplexer (5), pump laser (6), coupler (7), second speculum (8), isolator (9), the power equalization wave filter (3) is arranged at the decay of doped fiber (4) front end or isolator (9) front end to the laser progress different capacity of different wave length and optimizes each wavelength power output uniformity, each wavelength attenuation spectrum [Att of power equalization wave filter (3)1、Att2、……Attn] index meets following condition：[Att1、Att2、……Attn]=[P1、P2、……Pn]‑[Pmin], P1、P2、……PnFor adjustment tunable filter (2) operation wavelength when, every 1~2nm laser output power value；PminFor P1、P2、……PnMinimal power values；Apparatus of the present invention can reach different wave length power output uniformity optimum efficiency.
Description
Technical field
The present invention relates to a kind of linear cavity doped fiber laser, more particularly to one kind can be real in wider wave-length coverage
Existing wavelength continuously adjustable, the optimal optical fiber laser of different wave length power uniformity, the invention belongs to the communications field.
Background technology
Tunable optical fiber laser is not only significant in optical communication network application field, it may also be used for air is supervised
The fields such as survey, Fibre Optical Sensor, measurement, optical data storage, instrument and meter and medical science.The tunable optical that high power wavelength is accurately exported
Fibre laser has been used for fiber grating sensing system, and the wavelength shift of optical fiber grating sensing can be accurately tested with high s/n ratio,
And then detect the change of temperature, strain, displacement, stress and so on physical quantities.
In recent years, tunable optical fiber laser is quickly grown, it has also become study hotspot, traditional erbium doped fiber laser
1520~1620nm of tuning range, tuning manner is generally the side such as fiber grating, liquid crystal Fabry Perot filter plate, piezoelectric ceramics
Formula.
The upper energy level ion inversion degree of tunable optical fiber laser different wave length power output and doped fiber has very big
Relation, and the upper energy level ion inversion degree of doped fiber depends on the light channel structure of laser, pump power and used mixed
Miscellaneous fiber lengths, so will result in different wave length power uniformity and have than larger difference.
Because doped fiber in different wavelength gains is different, cause tunable laser in different-waveband output work
Rate comparison of coherence is poor；The laser having in addition uses power output feedback control scheme, so on the one hand causes control complicated,
Feedback control can cause power output relaxation to shake when another aspect laser wavelength is tuned, and cause the shake of power output.
The content of the invention
The purpose of the present invention overcomes the problem of prior art is present and deficiency, and there is provided a kind of tunable wave length, work(
The optimal optical fiber laser of rate uniformity.
The technical solution adopted in the present invention is：
A kind of linear cavity doped fiber laser, including tunable filter, the first speculum, power equalization wave filter, mix
Veiling glare fibre, pump signal wave multiplexer, pump laser, coupler, the second speculum, isolator, tunable filter connection first
Speculum, doped fiber one end connection pump signal wave multiplexer common port, the pumping end connection pumping of pump signal wave multiplexer swashs
Light device, the signal end connection coupler common port of pump signal wave multiplexer, coupler drop two port small end connects the second speculum, coupling
The big end connection output isolator input of clutch drop two port；The power equalization wave filter be arranged at doped fiber front end or every
The decay for carrying out different capacity to the laser of different wave length from device front end optimizes, and makes each wavelength power output uniformity, power
Each wavelength attenuation spectrum [Att of equalization filter (3)1、Att2、……Attn] index meets following condition：[Att1、Att2、……
Attn]=[P1、P2、……Pn]-[Pmin], P1、P2、……PnFor adjustment tunable filter (2) operation wavelength when, every 1~
2nm laser output power value；PminFor P1、P2、……PnMinimal power values.
The power equalization filter bandwidht is more than tunable filter bandwidth.
The tunable filter bandwidth of operation has lasing wavelength band less than doped fiber.
Described doped fiber institute doped rare earth element uses Er3+Or Yb3+Or Nd3+Or Pr3+Or Tm3+。
The invention has the advantages that：
Apparatus of the present invention introduce power equalization wave filter in light channel structure, by reasonable design power equalization filter,
Its bandwidth and decay spectra is matched with doped fiber gain spectral, laser output power, reach different wave length power output one
The optimal purpose of cause property；Output wavelength is tunable in wider wavelength band, power output uniformity reaches great improvement.
Brief description of the drawings
Fig. 1 is that prior art does not add power equalization filter linearity chamber doped fiber laser structure figure；
Fig. 2 is the linear cavity doped fiber laser structure figure of the present invention；
Fig. 3 is the linear cavity doped fiber laser structure figure of the present invention；
Wherein：
1：First speculum； 2：Tunable filter；
3：Power equalization wave filter； 4：Doped fiber；
5：Pump signal wave multiplexer； 6：Pump laser；
7：Coupler； 8:Second speculum；
9：Isolator；
Embodiment
In order that the object, technical solutions and advantages of the present invention are more clearly understood, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
As shown in figure 1, tunable filter 2 connects the first speculum 1 and doped fiber 4, the other end of doped fiber 4 respectively
The common port of pump signal wave multiplexer 5 is connected, the pumping end connection pump laser 6 of pump signal wave multiplexer 5, pump signal is closed
The signal end connection common port of coupler 7 of ripple device 5, the drop two port small end of coupler 7 connects the second speculum 8, the light splitting of coupler 7
The big end connection output input of isolator 9 of mouth.
Using the light channel structure shown in Fig. 1, the fiber lengths of reasonably optimizing doped fiber 4 and the splitting ratio of coupler 7 make
The parameter such as laser different wave length power output and side mode suppression ratio reaches that most preferably light path index request is exported to laser herein
Index optimization, adjust tunable filter 2 operation wavelength, every 1~2nm recording lasers in the range of whole laser bandwidth
Device output power value P1、P2、……Pn, find out the minimal power values P of these wavelengthmin, it is calculated as below, show that power equalization is filtered
Ripple device decay spectra：
[Att1、Att2、……Attn]=[P1、P2、……Pn]-[Pmin] (1)
AttnFor the pad value of each wavelength of power equalization wave filter 3, attenuation curve design, the processing obtained with formula (1)
Power equalization wave filter 3, for Fig. 2 with the light channel structure shown in Fig. 3 when laser output power is identical, internal opticses gain inequality
Not less, so Fig. 2 and Fig. 3 using formula (1) design, processing power equalization wave filter for whole light channel structure output shadow
Sound can be ignored.Power equalizer uses optical passive component.
Fig. 2, Fig. 3 embodiment are as follows：
As shown in Fig. 2 tunable filter 2 connects the first speculum 1 and power equalization wave filter 3, power equalization filter respectively
The other end of ripple device 3 connects doped fiber 4, the common port of the other end connection pump signal wave multiplexer 5 of doped fiber 4, pumping
The pumping end connection pump laser 6 of signal wave multiplexer 5, the signal end connection common port of coupler 7 of pump signal wave multiplexer 5,
The drop two port small end of coupler 7 connects the second speculum 8, the big end connection output input of isolator 9 of the drop two port of coupler 7.
One speculum 1 and the resonator of the second speculum 8 formation, doped fiber 4 are carried by the pumping stimulated radiation of pump laser 6
When the gain of confession is more than the passive loss between the first speculum 1 and the second speculum 8, it is possible to form stable laser and shake
Swing, the laser of the big end stable output power of the drop two port of coupler 7, and the core of this invention is that addition power is equal in light channel structure
Weigh wave filter 3, carries out the decay of different capacity to the laser of different wave length, reaches each wavelength laser power output preferable one
Cause property.
As shown in figure 3, tunable filter 2 connects the first speculum 1 and doped fiber 4, the other end of doped fiber 4 respectively
The common port of pump signal wave multiplexer 5 is connected, the pumping end connection pump laser 6 of pump signal wave multiplexer 5, pump signal is closed
The signal end connection common port of coupler 7 of ripple device 5, the drop two port small end of coupler 7 connects the second speculum 8, power equalization filtering
Device 3 connects the big end of the drop two port of coupler 7 and the output input of isolator 9 respectively.In the first speculum 1 and the shape of the second speculum 8
Into resonator, the gain that doped fiber 4 is provided by the pumping stimulated radiation of pump laser 6 is more than the first speculum 1
And during the second passive loss between speculum 8, it is possible to stable laser generation is formed, it is defeated at the big end of the drop two port of coupler 7
Go out the laser of power stability, and the core of this invention is that power equalization wave filter 3 is added in light channel structure, to different wave length
Laser carries out the decay of different capacity, reaches each preferable uniformity of wavelength laser power output.
The band of power equalization wave filter 3 is wider than the bandwidth of tunable filter 2 in the present invention, and the bandwidth of operation of tunable filter 2 is small
There is lasing wavelength band in doped fiber 4.4 doped rare earth elements of doped fiber in the present invention use Er3+Or Yb3+Or Nd3+
Or Pr3+Or Tm3+。
P in optimal enforcement example of the present invention1、P2、……PnFor when the operation wavelength of 1~2nm adjustment tunable filters 2
The laser output power value of record.As above two embodiment output laser are filtered by power equalization wave filter 3, reach raising
The purpose of power output uniformity.
The power equalization wave filter design method of the present invention can be equally used in doped optical fibre amplifier light channel structure,
But it is balanced in doped optical fibre amplifier light path to be that input signal gain to multiple wavelength is carried out, and makes the output of multiple wavelength
Signal power meets specific requirement, and meets Communication System Design requirement.And the emphasis of this invention is in optical fiber laser light path
Power filter, power output uniformity of the optimization tunable laser in the range of whole bandwidth are used in structure.
Understand that the optical fiber laser different wave length power output of the present invention is consistent by two kinds of embodiments of such as figure 2 above and Fig. 3
Property be greatly improved, the foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, it is all this
Any modifications, equivalent substitutions and improvements made within the spirit and principle of invention etc., should be included in the protection model of the present invention
Within enclosing.
Claims (4)
1. a kind of linear cavity doped fiber laser, it is characterised in that：Including tunable filter (2), the first speculum (1), work(
It is rate equalization filter (3), doped fiber (4), pump signal wave multiplexer (5), pump laser (6), coupler (7), second anti-
Mirror (8), isolator (9) are penetrated, tunable filter (2) connects the first speculum (1), doped fiber (4) one end connection pump signal
Wave multiplexer (5) common port, the pumping end connection pump laser (6) of pump signal wave multiplexer (5), pump signal wave multiplexer (5)
Signal end connection coupler (7) common port, coupler (7) drop two port small end connects the second speculum (8), coupler (7) point
Big end connection output isolator (9) input of optical port；The power equalization wave filter (3) be arranged at doped fiber (4) front end or
The decay that person's isolator (9) front end carries out different capacity to the laser of different wave length optimizes, and makes each wavelength power output consistent
Property, each wavelength attenuation spectrum [Att of power equalization wave filter (3)1、Att2、……Attn] index meets following condition and realize wavelength
Continuously adjustable：[Att1、Att2、……Attn]=[P1、P2、……Pn]-[Pmin], P1、P2、……PnTo adjust adjustable filtering
During the operation wavelength of device (2), every 1~2nm laser output power value；PminFor P1、P2、……PnMinimal power values.
2. a kind of linear cavity doped fiber laser according to claim 1, it is characterised in that：The power equalization filtering
Device (3) band is wider than tunable filter (2) bandwidth.
3. a kind of linear cavity doped fiber laser according to claim 1 or 2, it is characterised in that：The adjustable filtering
Device (2) bandwidth of operation has lasing wavelength band less than doped fiber (4).
4. a kind of linear cavity doped fiber laser according to claim 1, it is characterised in that：Described doped fiber
(4) institute's doped rare earth element uses Er3+Or Yb3+Or Nd3+Or Pr3+Or Tm3+。
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410687280.8A CN104466634B (en) | 2014-11-25 | 2014-11-25 | A kind of linear cavity doped fiber laser |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410687280.8A CN104466634B (en) | 2014-11-25 | 2014-11-25 | A kind of linear cavity doped fiber laser |
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| CN104466634A CN104466634A (en) | 2015-03-25 |
| CN104466634B true CN104466634B (en) | 2017-10-31 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2521792Y (en) * | 2001-12-26 | 2002-11-20 | 廖显奎 | Optical fibre element with equating power |
| CN2541856Y (en) * | 2002-03-15 | 2003-03-26 | 亚洲光学股份有限公司 | Power balance multiband optical fiber laser array |
| CN103199417A (en) * | 2013-03-29 | 2013-07-10 | 武汉光迅科技股份有限公司 | Rare earth doping optical fiber light source light path structure |
| CN103259172A (en) * | 2013-04-22 | 2013-08-21 | 西北大学 | Radio frequency modulation tunable all-fiber laser based on fiber loop mirror |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE60138935D1 (en) * | 2000-02-23 | 2009-07-23 | Fujitsu Ltd | Optical amplifier |
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2014
- 2014-11-25 CN CN201410687280.8A patent/CN104466634B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2521792Y (en) * | 2001-12-26 | 2002-11-20 | 廖显奎 | Optical fibre element with equating power |
| CN2541856Y (en) * | 2002-03-15 | 2003-03-26 | 亚洲光学股份有限公司 | Power balance multiband optical fiber laser array |
| CN103199417A (en) * | 2013-03-29 | 2013-07-10 | 武汉光迅科技股份有限公司 | Rare earth doping optical fiber light source light path structure |
| CN103259172A (en) * | 2013-04-22 | 2013-08-21 | 西北大学 | Radio frequency modulation tunable all-fiber laser based on fiber loop mirror |
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| CN104466634A (en) | 2015-03-25 |
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