CN104577675B - Linear cavity multi-wavelength thulium-doped fiber laser based on M Z interferometers - Google Patents
Linear cavity multi-wavelength thulium-doped fiber laser based on M Z interferometers Download PDFInfo
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Abstract
Linear cavity multi-wavelength thulium-doped fiber laser based on M Z interferometers, belong to optical information technology field, it is high in order to solve existing multi-wavelength thulium-doped fiber laser threshold value, stability is poor, baroque technical problem, the a ends connection of laser pumping source and wavelength division multiplexer, the b ends and c ends of wavelength division multiplexer are connected with single mode thulium doped fiber and the first Polarization Controller respectively, the other end of first Polarization Controller and the connection of the first coupler d1 ends, the d3 ends of first coupler and the connection of the second Polarization Controller, the second Polarization Controller other end and the connection of polarization-maintaining thulium doped fiber, the e1 ends connection of the polarization-maintaining thulium doped fiber other end and the second coupler, the e2 ends of second coupler and the d4 ends connection of the first coupler, the e3 ends of second coupler and the connection of e4 ends, the d2 ends of first coupler are used as output end, the f1 ends connection of the thulium doped fiber other end and circulator, the f2 ends of circulator and the connection of f3 ends, form full optical fiber laser linear laser cavity.
Description
Technical field
The present invention relates to a kind of linear cavity multi-wavelength thulium-doped fiber laser for being based on Mach-Zehnder (M-Z) interferometer, category
In optical information technology field.
Background technology
Thulium-doped fiber laser is operated in human eye safe waveband, in laser radar, remote sensing, medical treatment, FSO
There is preferable application prospect Deng field, it has also become one of current most potential laser technology.
Multi-wavelength thulium-doped fiber laser can substitute the labyrinth combined by multiple conventional lasers in wavelength-division multiplex,
And meet the requirement of multichannel number simultaneously, can very big simplied system structure, reduce cost.
The invention on multi-wavelength thulium-doped fiber laser is with studying still in the starting stage at present, and existing multi-wavelength is mixed
Thulium optical fiber laser mainly has following several schemes：1st, using nonlinear polarization rotation and four-wave mixing effect；2nd, using non-thread
Property fiber loop mirror；3rd, using high-birefringence fiber Bragg grating.Scheme 1 is based on nonlinear effect, non-thread with scheme 2
Property effect effectively suppression mode can compete, but need to introduce more than hundred meters of highly nonlinear optical fiber in laser cavity, threshold value height, surely
Qualitative difference, it is complicated, it is unfavorable for device integrated with minimizing.Multiwavelength laser number of wavelengths obtained by scheme 3 is limited, and
Number of wavelengths is untunable, it is difficult to produce 3 wavelengths above outputs.Therefore, simplify multi-wavelength optical fiber laser structure simultaneously and have
Effect ground suppresses the mode competition caused by thulium atom HOMOGENEOUS BROADENING, is to improve multi-wavelength optical fiber laser performance, reduces cost
Most effectual way.
The content of the invention
Existing multi-wavelength thulium-doped fiber laser threshold value is high, stability is poor, baroque technology in order to solve by the present invention
A kind of problem, it is proposed that linear cavity multi-wavelength thulium-doped fiber laser based on M-Z interferometers.
Linear cavity multi-wavelength thulium-doped fiber laser based on M-Z interferometers, including laser pumping source, wavelength division multiplexer,
Single mode thulium doped fiber, the first Polarization Controller, the second Polarization Controller, the first coupler, the second coupler, polarization-maintaining mix thulium light
Fine and circulator；
It is characterized in that, the connection of a ends of laser pumping source and wavelength division multiplexer, the b ends and c ends of wavelength division multiplexer respectively with
Single mode thulium doped fiber and the connection of the first Polarization Controller, the other end of the first Polarization Controller and the connection of the first coupler d1 ends,
The d3 ends of first coupler and the connection of the second Polarization Controller, the second Polarization Controller other end and the connection of polarization-maintaining thulium doped fiber,
The e1 ends connection of the polarization-maintaining thulium doped fiber other end and the second coupler, the e2 ends of the second coupler and the d4 ends of the first coupler connect
Connect, the e3 ends of the second coupler and the connection of e4 ends, the d2 ends of the first coupler are used as output end, the thulium doped fiber other end and ring
The f1 ends connection of row device, the f2 ends of circulator and the connection of f3 ends, form full optical fiber laser linear laser cavity structure.
Pumping source uses 1573nm laser diode, and a, b, c end of wavelength division multiplexer is respectively 1570nm ends, public
End and 2000nm ends.
The preferred 4m of single mode thulium doped fiber length, the preferred 4m of polarization-maintaining thulium doped fiber length.
Beneficial effects of the present invention：The present invention is largely improved using a kind of M-Z full optical fiber interferometers of new structure
Output laser stability, reduces threshold power, simplifies structure, and by adjusting the second Polarization Controller (4-2), to change two dry
The beam intensity ratio of arm is related to, M-Z interferometer filter peak intensity can be changed, so as to realize that number of wavelengths is 1-4 tunable, wavelength intervals
For 2.3nm, Single wavelength line width is 0.045nm, and wavelength interval can be changed by changing the length of polarization maintaining optical fibre 6, polarization-maintaining thulium doped fiber 6
Simultaneously as phase delay device and saturated absorbing body, the self-oscillation mould of linear intracavitary is can absorb, weakens self-oscillation mould and many
Mode competition between wavelength laser, optimizes output spectrum, improves in output laser stability, output multiwavelength laser one hour
Wavelength stability is better than 0.02nm, and power stability is better than 0.5dB.Single wavelength tunable range is close to 20nm.
Simple in construction, cost of the invention is low, threshold value is low, stability is high and is easily integrated, wavelength-division multiplex, Fibre Optical Sensor,
The fields such as optic communication have preferable application prospect.
Brief description of the drawings
Fig. 1 is the linear cavity multi-wavelength thulium-doped fiber laser structural representation of the invention based on M-Z interferometers.
(a) is Single wavelength laser output spectrum in one hour in Fig. 2；(b) it is dual-wavelength laser output spectrum in one hour；
(c) it is three wavelength laser output spectrums in one hour；(d) it is four wavelength laser output spectrums in one hour.
Fig. 3 is 1.91 mu m waveband Single wavelength laser spectrums.
Fig. 4 illustrates Single wavelength tunable range.
Embodiment
The present invention is elaborated below in conjunction with the accompanying drawings.
As shown in figure 1, the linear cavity multi-wavelength thulium-doped fiber laser based on M-Z interferometers, including laser pumping source 1,
Wavelength division multiplexer 2, single mode thulium doped fiber 3, the first Polarization Controller 4-1, the second Polarization Controller 4-2, the first coupler 5-1,
Second coupler 5-2, polarization-maintaining thulium doped fiber 6, circulator 7.
Each part connection of the laser uses fused fiber splice, a of 1573nm laser pumping sources 1 and wavelength division multiplexer 2
End connection, the b ends of wavelength division multiplexer 2 are connected with the one end of single mode thulium doped fiber 3, c ends and the first Polarization Control of wavelength division multiplexer 2
Device 4-1 one end is connected, and the first Polarization Controller 4-1 other end is connected with the first coupler 5-1 d1 ends, single mode thulium doped fiber
3 other end is connected with the f1 ends of circulator 7, and the f2 ends of circulator 7 are connected with f3 ends, constitutes feedback loop configuration.
Wherein, the maximum output of 1573nm laser diode pumping sources 1 is 250mW, and a, b, c end of wavelength division multiplexer 2 are distinguished
For 1570nm ends, common port, 2000nm ends.The length optimization of single mode thulium doped fiber 3 is 4m, and correspondence turns under 250mW pumping conditions
Change efficiency highest.
M-Z interferometers include the coupler 5-2 of the first couplers of 3dB 5-1,3db second, the second Polarization Controller in the present invention
4-2, polarization-maintaining thulium doped fiber 6, the first coupler 5-1 d3 ends are connected with the second Polarization Controller 4-2, the second Polarization Controller
The 4-2 other end is connected with polarization-maintaining thulium doped fiber 6, the length optimization of polarization-maintaining thulium doped fiber 6 be 4m, the second Polarization Controller 4-2 with
Polarization-maintaining thulium doped fiber 6 constitutes variable phase delay, and the other end of polarization-maintaining thulium doped fiber 6 is connected with the second coupler 5-2 e1 ends, structure
Into an interfere arm of Mach-increasing Deccan interferometer, the second coupler 5-2 e3 and e4 end is connected, and constitutes reflection type optical path, second
Coupler 5-2 e2 ends are connected with the d4 ends of the first coupler, constitute another interfere arm of M-Z interferometers, the first coupler
D2 ends be used as output end.
Laser pumping source 1 is opened, the power of laser pumping source 1 is adjusted in the range of 175mW-250mW can change laser output
Power.Pump light injects 4m single modes thulium doped fiber 3,2 μm of wave band dorsad amplified spontaneous emissions of generation by wavelength division multiplexer 2
Light injects M-Z interference filters, amplified spontaneous emission light through the first Polarization Controller 4-1, then by the first coupler 5-1 d1 ends
By the first coupler, 5-1 points are intensity identical two parts, are propagated respectively through two interfere arms, wherein dry along d3 ends to e1 ends
The light for relating to arm propagation produces additional phase delay after the second Polarization Controller 4-2 and polarization-maintaining thulium doped fiber 6, causes after two-arm
Amplified spontaneous emission light produce fixed optical path difference, interference is formed at the second coupler 5-2, through the second coupler 5-2 reflections
Go out to form interference again in the first coupler 5-1 afterwards, so as to realize comb filtering, filtered part broadband light is by the first coupling
Fed back again by circulator 7 in the d1 ends return cavity of device, so as in linear intracavitary persistent oscillation, form multiwavelength laser output.
Fig. 2 (a), (b), (c), (d) are respectively Single wavelength in one hour, dual wavelength, three wavelength, the output light of four wavelength
Spectrum, intra-record slack byte is 10 minutes, changes the beam intensity ratio of two interfere arms by adjusting the second Polarization Controller (4-2), can change M-Z
Interferometer filter peak intensity, so as to realize that number of wavelengths is tuned.Wavelength interval can be realized by changing the length of polarization-maintaining thulium doped fiber 6
Tuning, tuning rule is：Long optical fibers correspondence short wavelength interval, linear changing rule.
Fig. 3 is Single wavelength laser output spectrum at 1.91 μm, and its side mode suppression ratio is 45dB, and 3dB line widths are 0.045nm.
The filtering that the reference of second Polarization Controller 4-2 and polarization-maintaining thulium doped fiber 6 effectively optimizes M-Z interferometers is special
Property, the comb filtering cycle of traditional reflective M-Z interferometers, which needs to pass through, changes the change of two interfere arm arm length differences, operates numerous
It is trivial, more than 1nm filtering interval is generally realized, arm length difference need to be accurate within 0.1mm, higher to technological requirement.The structure is only
Achieve that filtering cycle changes by changing the length of polarization-maintaining thulium doped fiber 6, it is simple to operate effective.Wherein polarization-maintaining thulium doped fiber 6
It is another to function as saturated absorbing body, the self-oscillation mould of linear intracavitary is can absorb, weakens self-oscillation mould and multi-wavelength swashs
Mode competition between light, optimizes output spectrum, improves output laser stability, and its wavelength stability is less than 0.02nm, power
Stability is less than 0.5dB.
The second Polarization Controller 4-2 is adjusted, output wave long number is remained one, then adjusts the first Polarization Controller 4-1,
The tuning range (1895nm-1915nm) of Single wavelength can be achieved close to 20nm.As shown in Figure 4.
Claims (3)
1. the linear cavity multi-wavelength thulium-doped fiber laser based on M-Z interferometers, including laser pumping source (1), wavelength division multiplexer
(2), single mode thulium doped fiber (3), the first Polarization Controller (4-1), the second Polarization Controller (4-2), the first coupler (5-1),
Second coupler (5-2), polarization-maintaining thulium doped fiber (6) and circulator (7)；
It is characterized in that, laser pumping source (1) is connected with a ends of wavelength division multiplexer (2), the b ends and c ends point of wavelength division multiplexer (2)
It is not connected with single mode thulium doped fiber (3) and the first Polarization Controller (4-1), the other end of the first Polarization Controller (4-1) and
One coupler (5-1) d1 ends are connected, the d3 ends of the first coupler (5-1) and the second Polarization Controller (4-2) connection, the second polarization
Controller (4-2) other end and polarization-maintaining thulium doped fiber (6) connection, polarization-maintaining thulium doped fiber (6) other end and the second coupler (5-2)
The connection of e1 ends, the d4 ends connection of the e2 ends of the second coupler (5-2) and the first coupler (5-1), the second coupler (5-2)
E3 ends and the connection of e4 ends, the d2 ends of the first coupler (5-1) as output end, thulium doped fiber (3) other end and circulator (7)
F1 ends are connected, the f2 ends of circulator (7) and the connection of f3 ends, form full optical fiber laser linear laser cavity structure.
2. the linear cavity multi-wavelength thulium-doped fiber laser according to claim 1 based on M-Z interferometers, pumping source (1)
Using 1573nm laser diode, a, b, c end of wavelength division multiplexer (2) are respectively 1570nm ends, common port and 2000nm ends.
3. the linear cavity multi-wavelength thulium-doped fiber laser according to claim 1 based on M-Z interferometers, single mode mixes thulium light
Fine (3) length preferred 4m, polarization-maintaining thulium doped fiber (6) preferred 4m of length.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104064941A (en) * | 2014-07-04 | 2014-09-24 | 哈尔滨工业大学深圳研究生院 | Tunable multi-wavelength erbium-doped fiber laser |
| CN104078827A (en) * | 2014-07-04 | 2014-10-01 | 哈尔滨工业大学深圳研究生院 | Multi-wavelength erbium-doped fiber laser with multiple tuning functions |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104064941A (en) * | 2014-07-04 | 2014-09-24 | 哈尔滨工业大学深圳研究生院 | Tunable multi-wavelength erbium-doped fiber laser |
| CN104078827A (en) * | 2014-07-04 | 2014-10-01 | 哈尔滨工业大学深圳研究生院 | Multi-wavelength erbium-doped fiber laser with multiple tuning functions |
Non-Patent Citations (3)
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| "Tunable and switchable multiwavelength erbium-doped fiber ring laser based on a modified dual-pass Mach-Zehnder interferometer";Ai-Ping Luo 等;《Optics Letters》;20090715;第34卷(第14期);全文 * |
| "以环行器和光纤光栅为腔镜的可调谐窄线宽激光器";李坚 等;《中国激光》;20090530;第36卷(第5期);第1048页第1-2栏及附图1 * |
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