CN104577675A - Linear-cavity multi-wavelength Tm-doped optical fiber laser based on M-Z interferometer - Google Patents
Linear-cavity multi-wavelength Tm-doped optical fiber laser based on M-Z interferometer Download PDFInfo
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- CN104577675A CN104577675A CN201410843657.4A CN201410843657A CN104577675A CN 104577675 A CN104577675 A CN 104577675A CN 201410843657 A CN201410843657 A CN 201410843657A CN 104577675 A CN104577675 A CN 104577675A
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Abstract
The invention discloses a linear-cavity multi-wavelength Tm-doped fiber laser based on an M-Z interferometer, belongs to the technical field of optical information, and aims to solve the technical problems of high threshold value, low stability and complicated structure of an existing multi-wavelength Tm-doped optical fiber laser. A laser pumping source is connected with an a end of a wavelength division multiplexer; a b end and a c end of the wavelength division multiplexer are connected with a single-mode Tm-doped optical fiber and a first polarization controller respectively; the other end of the first polarization controller is connected with a d1 end of a first coupler; a d3 end of the first coupler is connected with a second polarization controller; the other end of the second polarization controller is connected with a polarization-maintaining Tm-doped optical fiber; the other end of the polarization-maintaining Tm-doped optical fiber is connected with an e1 end of the second coupler; an e2 end of the second coupler is connected with a d4 end of the first coupler; an e3 end and an e4 end of the second coupler are connected; a d2 end of the first coupler serves as an output end; the other end of the Tm-doped optical fiber is connected with an f1 end of a circulator; an f2 end and an f3 end of the circulator are connected, so that an all-fiber laser linear-cavity laser is formed.
Description
Technical field
The present invention relates to a kind of linear cavity multi-wavelength thulium-doped fiber laser based on Mach-Zehnder (M-Z) interferometer, belong to optical information technology field.
Background technology
Thulium-doped fiber laser is operated in human eye safe waveband, has good application prospect in fields such as laser radar, remote sensing, medical treatment, free space optical communication, has become one of the most potential current laser technology.
Multi-wavelength thulium-doped fiber laser can substitute the labyrinth combined by multiple conventional laser at wavelength division multiplexing, and meets the requirement of multichannel number simultaneously, can very large simplied system structure, reduces costs.
Invention at present about multi-wavelength thulium-doped fiber laser is still in the starting stage with research, and existing multi-wavelength thulium-doped fiber laser mainly contains following several scheme: 1, adopt nonlinear polarization rotation and four-wave mixing effect; 2, properties in nonlinear optical loop mirror is adopted; 3, high-birefringence fiber Bragg grating is adopted.Scheme 1 and scheme 2 are all based on nonlinear effect, and nonlinear effect can effectively suppression mode competition, but the highly nonlinear optical fiber of needs introducing more than hundred meters in laser cavity, and threshold value is high, poor stability, complex structure, are unfavorable for that device is integrated with miniaturization.The multiwavelength laser number of wavelengths that scheme 3 obtains is limited, and number of wavelengths is untunable, is difficult to generation more than 3 wavelength and exports.Therefore, simplifying the mode competition that multi-wavelength optical fiber laser structure also suppresses to be caused by thulium atom HOMOGENEOUS BROADENING simultaneously effectively, is improve multi-wavelength optical fiber laser performance, the most effectual way reduced costs.
Summary of the invention
In order to solve, existing multi-wavelength thulium-doped fiber laser threshold value is high, poor stability, baroque technical problem in the present invention, proposes a kind of linear cavity multi-wavelength thulium-doped fiber laser based on M-Z interferometer.
Based on the linear cavity multi-wavelength thulium-doped fiber laser of M-Z interferometer, comprise laser pumping source, wavelength division multiplexer, single mode thulium doped fiber, the first Polarization Controller second Polarization Controller, the first coupler, the second coupler, protect inclined thulium doped fiber and circulator;
It is characterized in that, laser pumping source is held with a of wavelength division multiplexer and is connected, the b end of wavelength division multiplexer is connected with single mode thulium doped fiber and the first Polarization Controller respectively with c end, the other end of the first Polarization Controller is connected with the first coupler d1 end, the d3 end of the first coupler is connected with the second Polarization Controller, the second Polarization Controller other end is connected with the inclined thulium doped fiber of guarantor, protect the inclined thulium doped fiber other end to be connected with the e1 end of the second coupler, the e2 end of the second coupler is connected with the d4 end of the first coupler, the e3 end of the second coupler is connected with e4 end, the d2 end of the first coupler is as output, the thulium doped fiber other end is connected with the f1 end of circulator, the f2 end of circulator is connected with f3 end, form full optical fiber laser linear laser cavity structure.
Pumping source adopts the laser diode of 1573nm, and a, b, c end of wavelength division multiplexer is respectively 1570nm end, common port and 2000nm end.
The preferred 4m of single mode thulium doped fiber length, protects the preferred 4m of inclined thulium doped fiber length.
Beneficial effect of the present invention: the present invention adopts a kind of M-Z full optical fiber interferometer of new structure, largely improve Output of laser stability, reduce threshold power, simplify the structure, by the beam intensity ratio regulating the second Polarization Controller (4-2) to change two interference arms, M-Z interferometer filter peak intensity can be changed, thus to realize number of wavelengths be that 1-4 is tunable, wavelength interval is 2.3nm, Single wavelength live width is 0.045nm, wavelength interval changes by changing polarization maintaining optical fibre 6 length, protect inclined thulium doped fiber 6 simultaneously as phase delay device and saturated absorbing body, self-oscillation mould in Absorbable rod linear cavity, weaken the mode competition between self-oscillation mould and multiwavelength laser, optimize output spectrum, improve Output of laser stability, export wavelength stability in multiwavelength laser one hour and be better than 0.02nm, power stability is better than 0.5dB.Single wavelength tunable range is close to 20nm.
Structure of the present invention is simple, cost is low, threshold value is low, stability is high and be easy to integrated, has good application prospect in fields such as wavelength division multiplexing, Fibre Optical Sensor, optical communications.
Accompanying drawing explanation
Fig. 1 is the linear cavity multi-wavelength thulium-doped fiber laser structural representation that the present invention is based on M-Z interferometer.
In Fig. 2, (a) is Single wavelength laser output spectrum in a hour; B () is dual-wavelength laser output spectrum in a hour; C () is three-wavelength laser output spectrum in a hour; D () is four wavelength laser output spectrums in a hour.
Fig. 3 is 1.91 mu m waveband Single wavelength laser spectroscopys.
Fig. 4 illustrates Single wavelength tunable range.
Embodiment
Below in conjunction with accompanying drawing, the present invention is elaborated.
As shown in Figure 1, based on the linear cavity multi-wavelength thulium-doped fiber laser of M-Z interferometer, comprise laser pumping source 1, wavelength division multiplexer 2, single mode thulium doped fiber 3, first Polarization Controller 4-1 second Polarization Controller 4-2, the first coupler 5-1, the second coupler 5-2, protect inclined thulium doped fiber 6, circulator 7.
Each parts connection of this laser all adopts fused fiber splice, 1573nm laser pumping source 1 is held with a of wavelength division multiplexer 2 and is connected, the b end of wavelength division multiplexer 2 is connected with single mode thulium doped fiber 3 one end, the c end of wavelength division multiplexer 2 is connected with first Polarization Controller 4-1 one end, the other end of the first Polarization Controller 4-1 is held with the d1 of the first coupler 5-1 and is connected, the other end of single mode thulium doped fiber 3 is held with the f1 of circulator 7 and is connected, and the f2 end of circulator 7 is held with f3 and is connected, and forms feedback loop configuration.
Wherein, the maximum output of 1573nm laser diode pumping source 1 is 250mW, and a, b, c end of wavelength division multiplexer 2 is respectively 1570nm end, common port, 2000nm end.Single mode thulium doped fiber 3 length optimization is 4m, and under 250mW pumping condition, corresponding conversion is most effective.
In the present invention, M-Z interferometer comprises 3dB first coupler 5-1, 3db second coupler 5-2, second Polarization Controller 4-2, protect inclined thulium doped fiber 6, the d3 end of the first coupler 5-1 is connected with the second Polarization Controller 4-2, the other end of the second Polarization Controller 4-2 is connected with the inclined thulium doped fiber 6 of guarantor, protecting inclined thulium doped fiber 6 length optimization is 4m, second Polarization Controller 4-2 forms variable phase delay with the inclined thulium doped fiber 6 of guarantor, protect inclined thulium doped fiber 6 other end to hold with the e1 of the second coupler 5-2 and be connected, interfere arm for one that forms Mach-increasing Deccan interferometer, e3 and the e4 end of the second coupler 5-2 connects, form reflection type optical path, the e2 end of the second coupler 5-2 is held with the d4 of the first coupler and is connected, form another interference arm of M-Z interferometer, the d2 end of the first coupler is as output.
Open laser pumping source 1, within the scope of 175mW-250mW, regulate laser pumping source 1 power to change laser output power.Pump light injects 4m single mode thulium doped fiber 3 by wavelength division multiplexer 2, produce 2 mu m wavebands dorsad amplified spontaneous emission light through the first Polarization Controller 4-1, held by the d1 of the first coupler 5-1 again and inject M-Z interference filter, two parts that amplified spontaneous emission light is divided into intensity identical by the first coupler 5-1, arm is interfered to be propagated respectively through two, the light of wherein interfering arm to be propagated along d3 end to e1 end produces additional phase delay through the second Polarization Controller 4-2 with after protecting inclined thulium doped fiber 6, the amplified spontaneous emission light after two-arm is caused to produce fixed light path difference, formed at the second coupler 5-2 place and interfere, go out at the first coupler 5-1 after the second coupler 5-2 reflects and again form interference, thus realize comb filtering, filtered part broadband light is held in return cavity by the d1 of the first coupler and is fed back by circulator 7, thus persistent oscillation in linear cavity, formation multiwavelength laser exports.
Fig. 2 (a), (b), (c), (d) are respectively the output spectrum of Single wavelength in a hour, dual wavelength, three-wavelength, four wavelength, intra-record slack byte is 10 minutes, by the beam intensity ratio regulating the second Polarization Controller (4-2) to change two interference arms, can change M-Z interferometer filter peak intensity, thus it is tuning to realize number of wavelengths.Wavelength interval realizes tuning by changing inclined thulium doped fiber 6 length of guarantor, and tuning rule is: long optical fibers corresponding short wavelength interval, linearly Changing Pattern.
Fig. 3 is 1.91 μm of place's Single wavelength laser output spectrums, and its side mode suppression ratio is 45dB, 3dB live width is 0.045nm.
Second Polarization Controller 4-2 quotes with the inclined thulium doped fiber 6 of guarantor the filtering characteristic effectively optimizing M-Z interferometer, the comb filtering cycle of traditional reflective M-Z interferometer needs to change by changing two interference arm arm length difference, complex operation, usually the filtering interval of more than 1nm is realized, within arm length difference need be accurate to 0.1mm, higher to technological requirement.This structure protects inclined thulium doped fiber 6 length by means of only change just can realize filtering cyclomorphosis, effectively simple to operate.Wherein protecting another effect of inclined thulium doped fiber 6 is as saturated absorbing body, self-oscillation mould in Absorbable rod linear cavity, weaken the mode competition between self-oscillation mould and multiwavelength laser, optimize output spectrum, improve Output of laser stability, its wavelength stability is less than 0.02nm, and power stability is less than 0.5dB.
Regulate the second Polarization Controller 4-2, make output wave long number remain one, then regulate the first Polarization Controller 4-1, the tuning range (1895nm-1915nm) of Single wavelength can be realized close to 20nm.As shown in Figure 4.
Claims (3)
1., based on the linear cavity multi-wavelength thulium-doped fiber laser of M-Z interferometer, comprise laser pumping source (1), wavelength division multiplexer (2), single mode thulium doped fiber (3), the first Polarization Controller (4-1) second Polarization Controller (4-2), the first coupler (5-1), the second coupler (5-2), protect inclined thulium doped fiber (6) and circulator (7);
It is characterized in that, laser pumping source (1) is held with a of wavelength division multiplexer (2) and is connected, the b end of wavelength division multiplexer (2) is connected with single mode thulium doped fiber (3) and the first Polarization Controller (4-1) respectively with c end, the other end of the first Polarization Controller (4-1) is connected with the first coupler (5-1) d1 end, the d3 end of the first coupler (5-1) is connected with the second Polarization Controller (4-2), second Polarization Controller (4-2) other end is connected with the inclined thulium doped fiber of guarantor (6), protect inclined thulium doped fiber (6) other end to be connected with the e1 end of the second coupler (5-2), the e2 end of the second coupler (5-2) is connected with the d4 end of the first coupler (5-1), the e3 end of the second coupler (5-2) is connected with e4 end, the d2 end of the first coupler (5-1) is as output, thulium doped fiber (3) other end is connected with the f1 end of circulator (7), the f2 end of circulator (7) is connected with f3 end, form full optical fiber laser linear laser cavity structure.
2. the linear cavity multi-wavelength thulium-doped fiber laser based on M-Z interferometer according to claim 1, pumping source (1) adopts the laser diode of 1573nm, and a, b, c end of wavelength division multiplexer (2) is respectively 1570nm end, common port and 2000nm end.
3. the linear cavity multi-wavelength thulium-doped fiber laser based on M-Z interferometer according to claim 1, the preferred 4m of single mode thulium doped fiber (3) length, protects the preferred 4m of inclined thulium doped fiber (6) length.
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Cited By (1)
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| CN109888603A (en) * | 2019-01-25 | 2019-06-14 | 长春理工大学 | The flat multi-wavelength noise like light-pulse generator of three annular resonant cavities |
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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 |
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