CN1295822C - Convertible dual-wavelength doping optical fiber laser - Google Patents
Convertible dual-wavelength doping optical fiber laser Download PDFInfo
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- CN1295822C CN1295822C CNB2004100197389A CN200410019738A CN1295822C CN 1295822 C CN1295822 C CN 1295822C CN B2004100197389 A CNB2004100197389 A CN B2004100197389A CN 200410019738 A CN200410019738 A CN 200410019738A CN 1295822 C CN1295822 C CN 1295822C
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Abstract
The present invention relates to a dual wavelength adulterate optical fiber laser, particularly to a laser which can generate steric mode beat effect, and the present invention belongs to the technical field of optical fibre communication and optical fiber sensing. The laser mainly comprises a pumping laser diode, a wavelength division multiplexer, adulterate optical fiber, a polarizer, a polarization controller, etc. The present invention realizes the wavelength selection of output laser through a multimode optical fibre raster with two reflection peaks, a single mode fiber-multimode optical fibre raster-single mode optical fiber structure is introduced, the steric mode beat effect is generated, reflection modes in two different polarization directions are separated in the wavelength, polarization hole burning effect is generated, mode competition caused by uniform gain stretching of the adulterate optical fiber is overcome, the polarization state of light in a cavity can be changed by adjusting the polarization controller in the cavity, the loss of wavelengths in two different polarization directions can be changed, and switch conversion of single wavelength and dual wavelengths under a normal temperature is realized. The present invention has the advantages of simple structure, convenient adjustment, low cost and stable operation under the normal temperature.
Description
Technical field
The present invention relates to a kind of dual wavelength doped fiber laser, particularly can produce the laser of spatial model beat effect, is a kind of new design in optical fiber communication and the sensory field of optic fibre, belongs to optical fiber communication and technical field of optical fiber sensing.
Background technology
Multi-wavelength optical fiber laser has purposes widely in optical communication and light sensory field, for example in dense wave division multipurpose (DWDM-Densed Wavelength Division Mutiplexing) system, in many reference amounts Fibre Optical Sensor and the optical soliton source, this kind light source all is extremely important.But in the doped fiber laser of development comparative maturity, since the mode competition that the gain broadening effect in the doped fiber causes, the difficult multi-wavelength output that realizes under the normal temperature in a laser cavity.Will realize multi-wavelength output at present, a kind of method is doped fiber to be put into to cool off in the liquid nitrogen reduce the gain broadening, but this method is obviously impracticable.Another kind method is that a plurality of fiber lasers are combined, though it can at room temperature obtain stable multi-wavelength output, needs with devices such as a plurality of drive circuits and laser cavities.Also having a kind of method is to utilize the F-P chamber to realize filtering, and shortcoming is to cost an arm and a leg.And in these structures, sharp the penetrating of different wave length has identical pumping threshold, is difficult to adjust or control the character of a certain specific wavelength.Yet, in some application, requires laser to be transferred to another wavelength, or export a plurality of wavelength simultaneously, but promptly laser has switch performance from a wavelength such as sensing, instrument test.Then this laser need add the generation that " switch " characteristic is effectively controlled each wavelength on the basis of multi-wavelength doped fiber laser.
Summary of the invention
The purpose of this invention is to provide a kind of simple in structure, tuning convenience, convertible dual wavelength low-cost and ambient stable work is exported the doped fiber laser, described doped fiber laser comprises: pump laser 1 is used for pumping doped fiber (DF); Have pump light/flashlight wavelength-division multiplexed optical coupler (WDM) 2 of at least three port a, b and c, be used for pump light and flashlight are coupled into doped fiber; The doped fiber 3 of one section appropriate length is by the pump light excitation, as gain media; A polarizer 4 and a Polarization Controller (PC) 5, sequence is connected the doped fiber back, produces the loss that the relies on wavelength difference with compensated fiber grating two reflection peak peak value sizes, also is used to control simultaneously polarization state of light in the laser cavity; One multi-mode optica lfiber grating 7 is introduced in the laser cavity by the port b of circulator 6, carries out the wavelength of laser output and selects; Output coupler 8 is used for the output of laser; Optical isolator 9 guarantees the unidirectional operation of endovenous laser.
Principle of the present invention is the multi-mode optica lfiber grating with two reflection peaks to be exported Wavelength of Laser select, introduce a kind of monomode fiber-multi-mode optica lfiber grating-monomode fiber structure, this structure can produce the spatial model beat effect, the reflection mould of two different polarization directions of multi-mode optica lfiber grating is separated on wavelength, two wavelength that are the multimode optical grating reflection have different polarization states, then therefore in Er-doped fiber, produced polarisation hole-burning effect, this polarisation hole-burning effect can overcome the mode competition that doped fiber uniform gain broadening causes, realize the stable output of dual wavelength under the normal temperature, can change polarization state of light in the chamber by the Polarization Controller of adjusting in the chamber again, thereby change the loss of wavelength on two orthogonal polarization orientation, to realize the place an order switch transition of wavelength and dual wavelength of normal temperature.If the difference in size of two reflection peaks of multi-mode optica lfiber grating is bigger, when merely regulating reflection peak that Polarization Controller can not make the long wavelength all the time less than short wavelength's reflection peak, can before Polarization Controller, add a polarizer, utilize the loss of the polarizer and a Polarization Controller combination results dependence wavelength, difference in order to compensated fiber grating two reflection peak peak value sizes, reach the purpose of wavelength Conversion, overcome the mode competition that doped fiber uniform gain broadening causes, can change polarization state of light in the chamber by the Polarization Controller of adjusting in the chamber again, change the loss of wavelength on two different polarization directions, realize the place an order switch transition of wavelength and dual wavelength of normal temperature.That this invention has is simple in structure, easy to adjust, with low cost, advantage such as steady operation at normal temperatures.
Description of drawings
Fig. 1 is that structure of the present invention is formed schematic diagram.
Fig. 2 is the reverberation spectrogram of the present invention's one multi-mode optica lfiber grating when being applied to erbium doped fiber laser.
Fig. 3 is the spectrogram of the present invention's two single wavelength outputs when being applied to erbium doped fiber laser.
Fig. 4 is the spectrogram of the present invention's dual wavelength output when being applied to erbium doped fiber laser.
Fig. 5 is the present invention two single wavelength output spectrum figure when being applied to ytterbium-doping optical fiber laser.
Fig. 6 is the spectrogram of the present invention's dual wavelength output when being applied to ytterbium-doping optical fiber laser.
Among the figure: 1. pump laser 2. pumpings/signal Wavelength division multiplexing optical coupler 3. doped fibers 4. polarizers 5. Polarization Controllers 6. circulators 7. multi-mode optica lfiber gratings 8. output couplers 9. optical isolators.
Embodiment
Below in conjunction with accompanying drawing the present invention is described in further detail:
This convertible dual wavelength doped fiber laser comprises: pump laser 1, pumping/signal Wavelength division multiplexing optical coupler 2, doped fiber 3, the polarizer 4, Polarization Controller 5, circulator 6, multi-mode optica lfiber grating 7 output couplers 8 and optical isolator 9; Wherein the port a of Wavelength division multiplexing optical coupler 2 is connected with the output of semiconductor pump laser 1, and port b is connected with isolator 9, and port c is connected with an end of doped fiber 3; The other end of doped fiber 3 is connected with the polarizer 4; The other end of the polarizer 4 is connected with Polarization Controller 5; Polarization Controller 5 other ends are connected with the port a of circulator 6; The port b of circulator 6 is connected with multimode fiber Bragg grating 7, and port c is connected with the port a of output coupler 8; The port b of output coupler 8 is as the laser output mouth, and port c is connected with optical isolator 9; The other end of optical isolator 9 is connected with the port b of Wavelength division multiplexing optical coupler 2.
Doped fiber certain metal that can mix arbitrarily, as er-doped, mix ytterbium, corresponding multi-mode optica lfiber grating is the multimode grating of this wave band relatively.
Allow two reflection peak sizes of multi-mode optica lfiber grating there are differences, its difference can be relied on the loss acquisition compensation of wavelength by the polarizer and the generation of Polarization Controller structure, thereby realizes that by the state of adjusting Polarization Controller two single wavelength of fiber laser are exported and the switch transition of dual wavelength output.
The multi-mode optica lfiber grating that application has two reflection peaks carries out the wavelength selection that laser is exported, introduce a kind of monomode fiber-multi-mode optica lfiber grating-monomode fiber structure, produce the spatial model beat effect, the reflection mould of two different polarization directions of multi-mode optica lfiber grating is separated on wavelength, two wavelength that are the multimode optical grating reflection have different polarization states, then therefore in Er-doped fiber, produced polarisation hole-burning effect, utilize polarisation hole-burning effect to overcome the mode competition that doped fiber uniform gain broadening causes, realize the stable output of dual wavelength under the normal temperature.
As Fig. 1, the pump light of laser diode is coupled in the laser cavity through the port a of pumping/signal Wavelength division multiplexing optical coupler 2, the port c of pumping/signal Wavelength division multiplexing optical coupler 2 links to each other with doped fiber 3, connect a polarizer 4 and a Polarization Controller 5 behind the doped fiber, connect a circulator 6 behind the Polarization Controller, multi-mode optica lfiber grating 7 is introduced in the laser cavity by the port b of circulator 6, carries out the wavelength of laser output and selects (reflectance spectrum of the multi-mode optica lfiber grating of a 1550nm wave band is seen Fig. 2).Pump light enters doped fiber 3 through pumping/signal Wavelength division multiplexing optical coupler 2, excites doped fiber to produce gain, and two wavelength satisfy light starting of oscillation in laser cavity of multi-mode optica lfiber grating conditioned reflex, and are coupled away by output coupler 8.The synergy of the polarizer 4 and Polarization Controller 5 produces the difference of the loss of dependence wavelength with compensated fiber grating two reflection peak peak value sizes, simultaneously also be used to control polarization state of light in the laser cavity, regulate Polarization Controller, can realize the conversion between single wavelength output and the dual wavelength output.The spectrogram of two single wavelength and dual wavelength output was seen Fig. 3 and Fig. 4 when the present invention was applied to erbium doped fiber laser.The spectrogram of two single wavelength and dual wavelength output was seen Fig. 5 and Fig. 6 when the present invention was applied to ytterbium-doping optical fiber laser.
Claims (3)
1. a convertible dual wavelength doped fiber laser is characterized in that it comprises: pump laser (1), pumping/signal Wavelength division multiplexing optical coupler (2), doped fiber (3), the polarizer (4), Polarization Controller (5), circulator (6), multi-mode optica lfiber grating (7), output coupler (8) and optical isolator (9); Wherein the port (a) of Wavelength division multiplexing optical coupler (2) is connected with the output of semiconductor pump laser (1), and port (b) is connected with isolator (9), and port (c) is connected with an end of doped fiber (3); The other end of doped fiber (3) is connected with the polarizer (4); The other end of the polarizer (4) is connected with Polarization Controller (5); Polarization Controller (5) other end is connected with the port (a) of circulator (6); The port (b) of circulator (6) is connected with multi-mode optica lfiber grating (7), and port (c) is connected with the port (a) of output coupler (8); The port (b) of output coupler (8) is as the laser output mouth, and port (c) is connected with an end of optical isolator (9); The other end of optical isolator (9) is connected with the port (b) of Wavelength division multiplexing optical coupler (2); Described multi-mode optica lfiber grating (7) has two reflection peaks, the wavelength of described reflection peak has different polarization states, its difference can be relied on the consume acquisition compensation of wavelength by the polarizer (4) and the generation of Polarization Controller (5) structure, thereby realizes that by the state of adjusting Polarization Controller (5) two single wavelength of described fiber laser are exported and the conversion of dual wavelength output.
2. according to the convertible dual wavelength doped fiber laser described in the claim 1, it is characterized in that: doped fiber (3) is the optical fiber of rare-earth metal doped ion, er-doped or mix ytterbium, and the reflection peak of multi-mode optica lfiber grating (7) is corresponding with dopant ion.
3. according to the convertible dual wavelength doped fiber laser described in the claim 1, it is characterized in that: two reflection peaks of multi-mode optica lfiber grating (7), its peak value difference in size is determined by the polarization of incident light attitude.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CNB2004100197389A CN1295822C (en) | 2004-06-25 | 2004-06-25 | Convertible dual-wavelength doping optical fiber laser |
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| CNB2004100197389A CN1295822C (en) | 2004-06-25 | 2004-06-25 | Convertible dual-wavelength doping optical fiber laser |
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| CN1595736A CN1595736A (en) | 2005-03-16 |
| CN1295822C true CN1295822C (en) | 2007-01-17 |
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| CNB2004100197389A Expired - Fee Related CN1295822C (en) | 2004-06-25 | 2004-06-25 | Convertible dual-wavelength doping optical fiber laser |
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Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101986483A (en) * | 2010-10-08 | 2011-03-16 | 北京航空航天大学 | Passive mode-locked pulsed laser |
| CN102299465A (en) * | 2011-07-08 | 2011-12-28 | 南昌航空大学 | Low-cost sweep frequency optical fiber laser applied to grating sensing |
| CN102324685A (en) * | 2011-08-31 | 2012-01-18 | 天津理工大学 | Multi-wavelength erbium-doped optical fiber laser based on parallel non-linear polarization rotation structure |
| CN102324687A (en) * | 2011-09-15 | 2012-01-18 | 天津理工大学 | Local-microstructure optical fiber grating-based dual-wavelength laser |
| CN102403646B (en) * | 2011-11-22 | 2012-11-14 | 中国科学院上海光学精密机械研究所 | Controllable double wavelength optical fiber laser |
| CN102636203B (en) * | 2012-05-02 | 2016-12-07 | 华中科技大学 | A kind of fiber grating sensing demodulation device based on dual wavelength beat frequency technology |
| CN102790349A (en) * | 2012-07-30 | 2012-11-21 | 北京航空航天大学 | Multi-wavelength passively Q-switched laser |
| CN103852092B (en) * | 2013-12-19 | 2017-05-24 | 哈尔滨工业大学（威海） | Mode interference annular cavity optical fiber laser sensor |
| CN103855597A (en) * | 2014-03-03 | 2014-06-11 | 山东大学 | Linear polarization ytterbium-doped double-clad fiber laser with dual wavelength switching function and adjusting method thereof |
| CN104752943A (en) * | 2015-04-27 | 2015-07-01 | 天津理工大学 | Interference structure-based dual-wavelength fiber laser |
| CN105140767A (en) * | 2015-09-18 | 2015-12-09 | 华中科技大学 | Dual-wavelength single-longitudinal-mode fiber laser |
| CN106768871A (en) * | 2016-11-14 | 2017-05-31 | 河南师范大学 | Method based on photoswitch laser beat frequency systematic survey fibre-optical dispersion |
| CN109378686A (en) * | 2018-09-29 | 2019-02-22 | 上海大学 | A kind of changeable multi-wavelength bidirectional tune Q rare-earth-doped fiber laser |
| CN109638623A (en) * | 2019-02-01 | 2019-04-16 | 南京邮电大学 | The switchable pulse optical fiber of bimodulus dual wavelength |
| CN113675711A (en) * | 2021-08-24 | 2021-11-19 | 长春理工大学 | Wavelength tunable gain switch pulse fiber laser |
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| CN1189709A (en) * | 1997-01-30 | 1998-08-05 | 中国科学院上海光学精密机械研究所 | Semiconductor laser and fibre-optical raster mixed and integrated wavelength commutator |
| JP2002076478A (en) * | 2000-08-16 | 2002-03-15 | Korea Advanced Inst Of Sci Technol | Very high speed multi-wavelength laser device using sampled optical fiber grating |
| CN1348239A (en) * | 2000-10-18 | 2002-05-08 | 中国科学技术大学 | Self-injection locking monofrequency ring fiber laser |
| CN1349291A (en) * | 2000-10-12 | 2002-05-15 | 中国科学技术大学 | Ring optical fiber Q-switching laser |
| CN1404190A (en) * | 2001-09-13 | 2003-03-19 | 华为技术有限公司 | Optical fiber laser with multi-wavelength output |
| CN1435922A (en) * | 2002-01-26 | 2003-08-13 | 华为技术有限公司 | Variable wavelenght output optic fibre laser |
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2004
- 2004-06-25 CN CNB2004100197389A patent/CN1295822C/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1189709A (en) * | 1997-01-30 | 1998-08-05 | 中国科学院上海光学精密机械研究所 | Semiconductor laser and fibre-optical raster mixed and integrated wavelength commutator |
| JP2002076478A (en) * | 2000-08-16 | 2002-03-15 | Korea Advanced Inst Of Sci Technol | Very high speed multi-wavelength laser device using sampled optical fiber grating |
| CN1349291A (en) * | 2000-10-12 | 2002-05-15 | 中国科学技术大学 | Ring optical fiber Q-switching laser |
| CN1348239A (en) * | 2000-10-18 | 2002-05-08 | 中国科学技术大学 | Self-injection locking monofrequency ring fiber laser |
| CN1404190A (en) * | 2001-09-13 | 2003-03-19 | 华为技术有限公司 | Optical fiber laser with multi-wavelength output |
| CN1435922A (en) * | 2002-01-26 | 2003-08-13 | 华为技术有限公司 | Variable wavelenght output optic fibre laser |
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