CN1741326A - Ring cavity single-longitudinal mode erbium doping optical fibre laser - Google Patents
Ring cavity single-longitudinal mode erbium doping optical fibre laser Download PDFInfo
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- CN1741326A CN1741326A CNA200510029379XA CN200510029379A CN1741326A CN 1741326 A CN1741326 A CN 1741326A CN A200510029379X A CNA200510029379X A CN A200510029379XA CN 200510029379 A CN200510029379 A CN 200510029379A CN 1741326 A CN1741326 A CN 1741326A
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Abstract
A kind of ring cavity single-longitudinal mode erbium doping optical fibre laser, comprise the semiconductor laser, it is characterized in that described semiconductor laser connects the first input end of first wavelength division multiplexer, the output of this first wavelength division multiplexer connects an Er-doped fiber, the input of another termination second wavelength division multiplexer of this Er-doped fiber, first port of the first output termination optical fiber circulator of this second wavelength division multiplexer, second port of this optical fiber circulator connects an erbium-doped nonlinear fiber grating, the 3rd port of this optical fiber circulator connects the input of fiber coupler, second input of the first output termination, first wavelength division multiplexer of this fiber coupler constitutes a loop laser chamber, second output of described second wavelength division multiplexer is residue pumping laser output, second output of described fiber coupler is the signal laser delivery outlet, and described erbium-doped nonlinear fiber grating is one to have the fiber grating of distributed feedback structure.
Description
Technical field
The present invention relates to fiber laser, particularly a kind of ring cavity single-longitudinal mode erbium doping optical fibre laser.Can be used in optical communication, Fibre Optical Sensor and the spectral analysis device.
Background technology
In Fabry Perot (F-P) cavity configuration, light field will present standing wave and distribute.The effects of spatial that the standing wave distribution of light field will cause gaining is (referring to the document Long March in 1: 5, Wang Zhaoyong etc." laser physics ", publishing house of Fudan University September in 1989 the 1st edition, the 332nd page), and this effect is the key factor that causes being difficult to realize the operation of laser single longitudinal mode in the F-P cavity configuration.
When one section doped fiber is in not pump state, this section doped fiber will produce absorption to the laser that wavelength is in its absorption spectra.In standing wave structure as the absorption effects of spatial that can occur in this section doped fiber of absorber to signal laser.This effect has the saturable absorption characteristic, the suffered absorption loss of promptly strong more flashlight is more little, this effect helps suppressing the competition of back starting of oscillation pattern, thereby (referring to document 2: Chen Bai, Chen Lanrong etc. ' not pumping doped fiber are mixing Yb to can be used for pressing the spectral bandwidth of narrow operation laser
3+Effect in the narrow cable and wide optical fiber laser ' Chinese laser, 2001, A28 (5), pp.339).
In ring cavity structure, when using isolator to make light can only unidirectional operation the time, light field will be traveling-wave structure, distribute and can not present standing wave.Therefore in the ring cavity structure of unidirectional operation,, thereby help realizing the operation of laser single longitudinal mode with the effects of spatial that can not occur gaining.But, only rely on simple ring cavity structure also to be difficult to realize stable single longitudinal mode laser operation for erbium doped fiber laser.
On one section doped fiber, inscribe uniform grating, when having gain, be one distributed feed-back-distributed feedback (DFB) structure (referring to document 3:H.Kogelnid andC.V.shank JAPPL.Phys., Vol.43, No.5,1972, pp.2327-2335).Light signal comes back reflective and obtains gain in by the chamber that fiber grating constituted.
But when do not gain in this zone, then light signal in by the chamber that fiber grating constituted back and forth reflex time will be absorbed.
Summary of the invention
The object of the present invention is to provide a kind of ring cavity single-longitudinal mode erbium doping optical fibre laser,
Basis of the present invention is: the inventor thinks because light coming back reflective and will make light light field in whole DFB grating chamber have the standing wave structure characteristic in DFB structure chamber.Therefore absorption effects of spatial to light will appear in whole grating chamber.Thereby do not have gain and only have the DFB mechanism of absorption, as be in the laser cavity, help suppressing the competition of back starting of oscillation pattern, realize the single longitudinal mode laser operation thereby help laser.
Technical solution of the present invention is as follows:
A kind of ring cavity single-longitudinal mode erbium doping optical fibre laser, comprise the semiconductor laser, it is characterized in that described semiconductor laser connects the first input end of first wavelength division multiplexer, the output of this first wavelength division multiplexer connects an Er-doped fiber, the input of another termination second wavelength division multiplexer of this Er-doped fiber, first port of the first output termination optical fiber circulator of this second wavelength division multiplexer, second port of this optical fiber circulator connects an erbium-doped nonlinear fiber grating, the 3rd port of this optical fiber circulator connects the input of fiber coupler, second input of the first output termination, first wavelength division multiplexer of this fiber coupler constitutes a loop laser chamber, second output of described second wavelength division multiplexer is residue pumping laser output, second output of described fiber coupler is the signal laser delivery outlet, and described erbium-doped nonlinear fiber grating is one to have the fiber grating of distributed feedback structure.
Working condition of the present invention is as follows:
Pump light from semiconductor laser is coupled into Er-doped fiber through first wavelength division multiplexer.The residual pump light that comes out from Er-doped fiber is coupled out outside the chamber through second output of second wavelength division multiplexer, and flashlight then is coupled to first port of optical fiber circulator, and an erbium-doped nonlinear fiber grating is connected with second port of optical fiber circulator.Erbium-doped nonlinear fiber grating reflexes to described optical fiber circulator 5 to flashlight and exports through the 3rd port.This erbium-doped nonlinear fiber grating defines the gain spectra district of flashlight on the one hand, again flashlight is produced absorption on the other hand.And will produce the absorption effects of spatial to flashlight at erbium-doped nonlinear fiber grating.Using of optical fiber circulator guaranteed that flashlight is unidirectional operation in other zone except that erbium-doped nonlinear fiber grating.Flashlight from the circulator port is exported through the coupling of fiber coupler 7 second an output ports part, and another part is coupled to first wavelength division multiplexer through first output port and enters next circulation.Ring cavity single-longitudinal mode erbium doping optical fibre laser of the present invention is divided into gain region and uptake zone to laser cavity.Making signal laser in the gain fibre district is the operation of row ripple, and the standing wave of having eliminated in the F-P chamber distributes, therefore in the gain fibre district, with the effects of spatial that can not occur gaining; And in the distributed feed-back erbium-doped nonlinear fiber grating district that has filtering and absorption concurrently, light field then distributes for standing wave, can occur the absorption effects of spatial to signal laser in this section Er-doped fiber.
More than the acting in conjunction of two kinds of effects make laser realize stable single longitudinal mode operation.
Description of drawings
Fig. 1 is the structured flowchart of ring cavity single-longitudinal mode erbium doping optical fibre laser of the present invention
Among the figure:
The 1-semiconductor laser, 2-wavelength division multiplexer, 3-Er-doped fiber, 4-wavelength division multiplexer, 5-light path circulator, 6-erbium-doped nonlinear fiber grating, 7-fiber coupler, the output of 8-residue pumping laser output 9-signal laser.
Embodiment
The invention will be further described below in conjunction with accompanying drawing.
See also Fig. 1 earlier, Fig. 1 is the structured flowchart of ring cavity single-longitudinal mode erbium doping optical fibre laser of the present invention, as seen from the figure, the formation of ring cavity single-longitudinal mode erbium doping optical fibre laser of the present invention, comprise semiconductor laser 1, this semiconductor laser 1 connects the first input end of first wavelength division multiplexer 2, the output of this first wavelength division multiplexer 2 connects an Er-doped fiber 3, the input of these Er-doped fiber 3 another termination second wavelength division multiplexers 4, the first port a of the first output termination optical fiber circulator 5 of this second wavelength division multiplexer 4, the second port b of this optical fiber circulator 5 connects an erbium-doped nonlinear fiber grating 6, the 3rd port c of this optical fiber circulator 5 connects the input of fiber coupler 7, second input of the first output termination, first wavelength division multiplexer 2 of this fiber coupler 7 constitutes a loop laser chamber, second output 8 of described second wavelength division multiplexer 4 is residue pumping laser output, second output 9 of described fiber coupler 7 is the signal laser delivery outlet, and described erbium-doped nonlinear fiber grating 6 is one to have the fiber grating of distributed feedback structure.
Working condition of the present invention is as follows:
Pump light from semiconductor laser 1 is coupled into Er-doped fiber 3 through first wavelength division multiplexer 2.The residual pump light that comes out from Er-doped fiber 3 is coupled out outside the chamber through second output 8 of second wavelength division multiplexer 4, and flashlight then is coupled to the first port a of optical fiber circulator 5, and an erbium-doped nonlinear fiber grating 6 is connected with the second port b of optical fiber circulator.Erbium-doped nonlinear fiber grating 6 reflexes to described optical fiber circulator 5 to flashlight and exports through the 3rd port c.This erbium-doped nonlinear fiber grating 6 defines the gain spectra district of flashlight on the one hand, again flashlight is produced absorption on the other hand.And will produce the absorption effects of spatial at 6 pairs of flashlights of erbium-doped nonlinear fiber grating.Using of optical fiber circulator 6 guaranteed that flashlight is unidirectional operation in other zone except that erbium-doped nonlinear fiber grating 6.Flashlight from circulator port c is exported through 9 part couplings of fiber coupler 7 second output ports, and another part is coupled to first wavelength division multiplexer 1 through first output port and enters next circulation.Ring cavity single-longitudinal mode erbium doping optical fibre laser of the present invention is divided into gain region and uptake zone to laser cavity.Making signal laser in the gain fibre district is the operation of row ripple, and the standing wave of having eliminated in the F-P chamber distributes, therefore in the gain fibre district, with the effects of spatial that can not occur gaining; And in having the distributed feed-back erbium-doped nonlinear fiber grating 6 of filtering and absorption concurrently, light field then distributes for standing wave, can occur the absorption effects of spatial to signal laser in this section Er-doped fiber.More than the acting in conjunction of two kinds of effects make laser realize stable single longitudinal mode operation.
Claims (1)
1, a kind of ring cavity single-longitudinal mode erbium doping optical fibre laser, comprise semiconductor laser (1), it is characterized in that described semiconductor laser (1) connects the first input end of first wavelength division multiplexer (2), the output of this first wavelength division multiplexer (2) connects an Er-doped fiber (3), the input of another termination second wavelength division multiplexer (4) of this Er-doped fiber (3), first port (a) of the first output termination optical fiber circulator (5) of this second wavelength division multiplexer (4), second port (b) of this optical fiber circulator (5) connects an erbium-doped nonlinear fiber grating (6), the 3rd port (c) of this optical fiber circulator (5) connects the input of fiber coupler (7), second input of first output termination first wavelength division multiplexer (2) of this fiber coupler (7) constitutes a loop laser chamber, second output (8) of described second wavelength division multiplexer (4) is residue pumping laser output, second output (9) of described fiber coupler (7) is the signal laser delivery outlet, and described erbium-doped nonlinear fiber grating (6) is one to have the fiber grating of distributed feedback structure.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA200510029379XA CN1741326A (en) | 2005-09-02 | 2005-09-02 | Ring cavity single-longitudinal mode erbium doping optical fibre laser |
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| Application Number | Priority Date | Filing Date | Title |
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| CNA200510029379XA CN1741326A (en) | 2005-09-02 | 2005-09-02 | Ring cavity single-longitudinal mode erbium doping optical fibre laser |
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| CN1741326A true CN1741326A (en) | 2006-03-01 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101908708A (en) * | 2010-07-16 | 2010-12-08 | 山东大学 | Fiber device for fusing fiber distributed feedback (DFB) laser and fiber amplifier |
| CN104503080A (en) * | 2014-12-15 | 2015-04-08 | 哈尔滨工程大学 | Multi-path optical path correlator with adjustable resonance cavity length |
| CN104733987A (en) * | 2013-12-19 | 2015-06-24 | 李国玉 | Linear automatic tunable annular cavity fiber laser |
| CN109004501A (en) * | 2018-07-20 | 2018-12-14 | 中国科学院合肥物质科学研究院 | A kind of high stable tunable single longitudinal mode circular cavity optic fibre laser |
| CN115296132A (en) * | 2022-10-09 | 2022-11-04 | 武汉中科锐择光电科技有限公司 | High-spectral-purity polarization-maintaining fiber Raman laser generation system |
-
2005
- 2005-09-02 CN CNA200510029379XA patent/CN1741326A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101908708A (en) * | 2010-07-16 | 2010-12-08 | 山东大学 | Fiber device for fusing fiber distributed feedback (DFB) laser and fiber amplifier |
| CN104733987A (en) * | 2013-12-19 | 2015-06-24 | 李国玉 | Linear automatic tunable annular cavity fiber laser |
| CN104503080A (en) * | 2014-12-15 | 2015-04-08 | 哈尔滨工程大学 | Multi-path optical path correlator with adjustable resonance cavity length |
| CN109004501A (en) * | 2018-07-20 | 2018-12-14 | 中国科学院合肥物质科学研究院 | A kind of high stable tunable single longitudinal mode circular cavity optic fibre laser |
| CN115296132A (en) * | 2022-10-09 | 2022-11-04 | 武汉中科锐择光电科技有限公司 | High-spectral-purity polarization-maintaining fiber Raman laser generation system |
| CN115296132B (en) * | 2022-10-09 | 2023-02-14 | 武汉中科锐择光电科技有限公司 | High spectral purity polarization maintaining optical fiber Raman laser generation system |
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