CN102522681A - Single longitudinal mode optical fibre laser with multi-cavity structure based on optical fibre coupler - Google Patents
Single longitudinal mode optical fibre laser with multi-cavity structure based on optical fibre coupler Download PDFInfo
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- CN102522681A CN102522681A CN2011104216853A CN201110421685A CN102522681A CN 102522681 A CN102522681 A CN 102522681A CN 2011104216853 A CN2011104216853 A CN 2011104216853A CN 201110421685 A CN201110421685 A CN 201110421685A CN 102522681 A CN102522681 A CN 102522681A
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Abstract
The invention discloses a single longitudinal mode optical fibre laser with a multi-cavity structure based on an optical fibre coupler, relating to a laser, which is suitable for the field of optical fibre communication. The single longitudinal mode optical fibre laser solves such problems as a variety of components, a complicated structure, high cost and poor stability, of a current optical fibre laser with a narrow line width. A pumping source (4) in the laser is connected with one end of a first optical fibre grating (21), and the other end of the first optical fibre grating (21) is connected with one end of an active single mode optical fibre (1); the other end of the active single mode optical fibre (1) is connected with a first port of a first coupler (31); and a third port, a second port and a fourth port of the first coupler (31) are respectively connected with the second optical fibre grating (22), the third optical fibre grating (23) and the fourth optical fibre grating (24), so that the laser is output from the fourth optical fibre grating (24). The first and third optical fibre gratings (21, 23) and the second and fourth optical fibre gratings (22, 23) form a plurality of linear resonant cavities for filtering the laser signal, so that laser with the single longitudinal mode and the narrow line with is output.
Description
Technical field
The present invention relates to a kind of laser, be applicable to fiber optic communication field.
Background technology
Begin from first laser of the graceful manufacturing of plum, the mankind have opened the prelude that utilizes the high-quality artificial light, and along with development of technology, all kinds of lasers emerge in an endless stream.The most noticeable in the present all kinds of laser with the fiber laser advantage, the good beam quality of fiber laser, compact conformation, low, the light-light conversion efficiency height of the heat efficiency.Therefore fiber laser has all obtained excellent popularization in a lot of fields.With regard to current development, fiber laser mainly contains multi-wavelength, narrow linewidth, the several developing direction of high power.
At first, aspect high power fiber laser, attracted people's extensive concern with characteristics such as its good beam quality, conversion efficiency height and compact conformations based on the fiber laser of covering pumping technology.The single fiber power output of fiber laser in 2004 reaches a kilowatt magnitude, and IPG company reports in 2009 have been realized the single-mode laser output of single fiber myriawatt.But along with the increase of power, various nonlinear effects such as SBS, SRS and FWM make beam quality seriously reduce, and become the huge obstacle of further increase laser power.The proposition of big mode field area LMA optical fiber becomes a kind of feasible method, increases fiber radius and can effectively increase the luminous power that optical fiber can carry under the constant situation of optical power density keeping, for the preparation of high power fiber laser provides necessary precondition.But because the fiber radius increasing degree is limited, excessive fiber radius makes the complicacy that the mould field becomes, beam quality can not get guaranteeing, so this method problem that can solve receives the restriction of fiber size.
Another kind method is MOPA MOPA, and this method can effectively increase laser power, and exports being of high quality of laser, but receives the restriction of simple optical fiber luminous power bearing capacity equally.
Secondly, aspect narrow linewidth, fiber laser turns to the master with small-sized, more is to pursue narrower live width, and additional additional devices and equipment are more, and it is complicated and unreliable to make that the structure of laser becomes.
Therefore, the composition device of narrow cable and wide optical fiber laser is of a great variety at present, complex structure, and cost is high, poor stability.
Summary of the invention
Technical problem to be solved by this invention is: the composition device of narrow cable and wide optical fiber laser is of a great variety at present, complex structure, and cost is high, the problem of poor stability.
Technical scheme of the present invention is:
Multi-cavity structure single-longitudinal-mode fiber laser based on fiber coupler is characterized in that:
This laser comprises active monomode fiber, first to fourth fiber grating, and first coupler, pumping source, the connected mode of each device is:
One end of output termination first fiber grating of pumping source; The other end of first fiber grating is connected to an end of source monomode fiber; First port of another termination first coupler of active monomode fiber; The 3rd port of first coupler connects second fiber grating, and second port of first coupler connects the 3rd fiber grating, and the 4th port of first coupler connects an end of the 4th fiber grating.
Laser is from the other end output of the 4th fiber grating.
The centre wavelength of described first to fourth fiber grating is identical.
The reflectivity of the centre wavelength of described first to the 3rd fiber grating is more than or equal to 95%.
The centre wavelength reflectivity of described the 4th fiber grating is 30%～70%.
Second port of described first coupler connects the 3rd port of second coupler, and first port of second coupler connects the 3rd fiber grating, and second port of second coupler connects the 5th fiber grating, and the 4th port of second coupler connects the six fibers grating.
Laser is from the other end output of the 4th fiber grating.
Described first is identical to the centre wavelength of six fibers grating.
Described first, second and third, five, the reflectivity of the centre wavelength of six fibers grating is more than or equal to 95%.
The centre wavelength reflectivity of described the 4th fiber grating is 30%～70%.
The 4th port of described first coupler connects first port of the 3rd coupler; Second port of the 3rd coupler connects the 3rd port of the 4th coupler; The 3rd port of the 3rd coupler connects an end of the 4th fiber grating, and the 4th port of the 3rd coupler connects the six fibers grating.
The 4th port of second coupler connects first port of the 4th coupler.
Second port of the 4th coupler connects the 7th fiber grating, and the 4th port of the 4th coupler connects the 8th fiber grating.
Laser is from the other end output of the 4th fiber grating.
The centre wavelength of described first to the 8th fiber grating is identical.
Described first, second and third, the reflectivity of the centre wavelength of five, six, seven, eight fiber gratings is more than or equal to 95%.
The centre wavelength reflectivity of described the 4th fiber grating is 30%～70%.
Described Active Optical Fiber dopant ion comprises erbium ion, ytterbium ion, thulium ion.
The present invention compares the beneficial effect that is had with prior art:
The present invention constitutes a plurality of linear cavity by the fiber grating of first, second port connection of coupler with the fiber grating that the 3rd, the 4th port of coupler is connected; A plurality of linear cavity are chosen longitudinal mode; Isolator and circulator in saturated absorbing body, optical narrow pass band filters and the annular cavity laser in the existing single-longitudinal-mode fiber laser are compared in the output of generation single longitudinal mode, and employed coupler and Fiber Bragg Grating technology are ripe among the present invention; With low cost, simple in structure; Because each device self stability that adopts is very strong, and in being combined into the process of laser, does not introduce and make the laser performance factors of instability, therefore the stability of laser according to the invention is stronger.
Description of drawings
Fig. 1 is the multi-cavity structure single-longitudinal-mode fiber laser based on fiber coupler of a coupler.
Fig. 2 is the multi-cavity structure single-longitudinal-mode fiber laser based on fiber coupler of two couplers.
Fig. 3 is the multi-cavity structure single-longitudinal-mode fiber laser based on fiber coupler of four couplers.
Embodiment
Below in conjunction with accompanying drawing the present invention is further described.
Execution mode one
Based on the multi-cavity structure single-longitudinal-mode fiber laser of fiber coupler, like Fig. 1, this laser comprises active monomode fiber 1, first to fourth fiber grating 21,22,23,24, the first couplers 31, pumping source 4, and the connected mode of each device is:
One end of output termination first fiber grating 21 of pumping source 4; The other end of first fiber grating 21 is connected to an end of source monomode fiber 1; First port of another termination first coupler 31 of active monomode fiber 1; The 4th port that second port that the 3rd port of first coupler 31 connects second fiber grating, 22, the first couplers 31 connects the 3rd fiber grating 23, the first couplers 31 connects an end of the 4th fiber grating 24.
Laser is from the other end output of the 4th fiber grating 24.
The centre wavelength of described first to fourth fiber grating 21,22,23,24 is identical.
The reflectivity of the centre wavelength of described first to the 3rd fiber grating 21,22,23 equals 95%.
The centre wavelength reflectivity of described the 4th fiber grating 24 is 30%.
Described Active Optical Fiber 1 is an Er-doped fiber.
Execution mode two
Based on the multi-cavity structure single-longitudinal-mode fiber laser of fiber coupler, like Fig. 2, this laser comprises active monomode fiber 1; First to six fibers grating 21,22,23,24,25,26; First and second coupler 31,32, pumping source 4, the connected mode of each device is:
One end of output termination first fiber grating 21 of pumping source 4; The other end of first fiber grating 21 is connected to an end of source monomode fiber 1; First port of another termination first coupler 31 of active monomode fiber 1; The 4th port that the 3rd port of first coupler 31 connects second fiber grating, 22, the first couplers 31 connects an end of the 4th fiber grating 24; Second port of first coupler 31 connects the 3rd port of second coupler 32; First port of second coupler 32 connects the 3rd fiber grating 23; The 4th port that second port of second coupler 32 connects the 5th fiber grating 25, the second couplers 32 connects six fibers grating 26;
Laser is from the other end output of the 4th fiber grating 24.
Described first is identical to the centre wavelength of six fibers grating 21,22,23,24,25,26.
Described first, second and third, five, the reflectivity of the centre wavelength of six fibers grating 21,22,23,25,26 is 97%.
The centre wavelength reflectivity of described the 4th fiber grating 24 is 50%.
Described Active Optical Fiber 1 is a Yb dosed optical fiber.
Execution mode three
Multi-cavity structure single-longitudinal-mode fiber laser based on fiber coupler; Like Fig. 3; This laser comprises active monomode fiber 1, the first to the 8th fiber grating 21,22,23,24,25,26,27,28, first, second, third and fourth coupler 31,32,33,34; Pumping source 4, the connected mode of each device is:
One end of output termination first fiber grating 21 of pumping source 4; The other end of first fiber grating 21 is connected to an end of source monomode fiber 1; First port of another termination first coupler 31 of active monomode fiber 1, the 3rd port of first coupler 31 connects second fiber grating 22; Second port of first coupler 31 connects the 3rd port of second coupler 32, and second port that first port of second coupler 32 connects the 3rd fiber grating 23, the second couplers 32 connects the 5th fiber grating 25; The 4th port of first coupler 31 connects first port of the 3rd coupler 33; Second port of the 3rd coupler 33 connects the 3rd port of the 4th coupler 34; The 3rd port of the 3rd coupler 33 connects an end of the 4th fiber grating 24, and the 4th port of the 3rd coupler 33 connects six fibers grating 26; The 4th port of second coupler 32 connects first port of the 4th coupler 34; The 4th port that second port of the 4th coupler 34 connects the 7th fiber grating 27, the four couplers 34 connects the 8th fiber grating 28.
Laser is from the other end output of the 4th fiber grating 24.
The centre wavelength of described first to the 8th fiber grating 21,22,23,24,25,26,27,28 is identical.
Described first, second and third, the reflectivity of the centre wavelength of five, six, seven, eight fiber gratings 21,22,23,25,26,27,28 is 99.9%.
The centre wavelength reflectivity of described the 4th fiber grating 24 is 70%.
Described Active Optical Fiber 1 thulium doped fiber.
Claims (4)
1. based on the multi-cavity structure single-longitudinal-mode fiber laser of fiber coupler, it is characterized in that:
This laser comprises active monomode fiber (1), first to fourth fiber grating (21,22,23,24), and first coupler (31), pumping source (4), the connected mode of each device is:
One end of output termination first fiber grating (21) of pumping source (4); The other end of first fiber grating (21) is connected to an end of source monomode fiber (1); First port of another termination first coupler (31) of active monomode fiber (1); The 3rd port of first coupler (31) connects second fiber grating (22), and second port of first coupler (31) connects the 3rd fiber grating (23), and the 4th port of first coupler (31) connects an end of the 4th fiber grating (24);
Laser is from the other end output of the 4th fiber grating (24);
The centre wavelength of described first to fourth fiber grating (21,22,23,24) is identical;
The reflectivity of the centre wavelength of described first to the 3rd fiber grating (21,22,23) is more than or equal to 95%;
The centre wavelength reflectivity of described the 4th fiber grating (24) is 30%～70%.
2. the multi-cavity structure single-longitudinal-mode fiber laser based on fiber coupler according to claim 1 is characterized in that:
Second port of described first coupler (31) connects the 3rd port of second coupler (32); First port of second coupler (32) connects the 3rd fiber grating (23); Second port of second coupler (32) connects the 5th fiber grating (25), and the 4th port of second coupler (32) connects six fibers grating (26);
Laser is from the other end output of the 4th fiber grating (24);
Described first is identical to the centre wavelength of six fibers grating (21,22,23,24,25,26);
Described first, second and third, five, the reflectivity of the centre wavelength of six fibers grating (21,22,23,25,26) is more than or equal to 95%;
The centre wavelength reflectivity of described the 4th fiber grating (24) is 30%～70%.
3. the multi-cavity structure single-longitudinal-mode fiber laser based on fiber coupler according to claim 2 is characterized in that:
The 4th port of described first coupler (31) connects first port of the 3rd coupler (33); Second port of the 3rd coupler (33) connects the 3rd port of the 4th coupler (34); The 3rd port of the 3rd coupler (33) connects an end of the 4th fiber grating (24), and the 4th port of the 3rd coupler (33) connects six fibers grating (26);
The 4th port of second coupler (32) connects first port of the 4th coupler (34);
Second port of the 4th coupler (34) connects the 7th fiber grating (27), and the 4th port of the 4th coupler (34) connects the 8th fiber grating (28);
Laser is from the other end output of the 4th fiber grating (24);
The centre wavelength of described first to the 8th fiber grating (21,22,23,24,25,26,27,28) is identical;
Described first, second and third, the reflectivity of the centre wavelength of five, six, seven, eight fiber gratings (21,22,23,25,26,27,28) is more than or equal to 95%;
The centre wavelength reflectivity of described the 4th fiber grating (24) is 30%～70%.
4. the multi-cavity structure single-longitudinal-mode fiber laser based on fiber coupler according to claim 1 is characterized in that:
Described Active Optical Fiber (1) dopant ion comprises erbium ion, ytterbium ion, thulium ion.
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| CN2011104216853A CN102522681A (en) | 2011-12-16 | 2011-12-16 | Single longitudinal mode optical fibre laser with multi-cavity structure based on optical fibre coupler |
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| CN2011104216853A CN102522681A (en) | 2011-12-16 | 2011-12-16 | Single longitudinal mode optical fibre laser with multi-cavity structure based on optical fibre coupler |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6041070A (en) * | 1997-11-14 | 2000-03-21 | Sdl, Inc. | Resonant pumped short cavity fiber laser |
| CN101222106A (en) * | 2007-12-26 | 2008-07-16 | 北京交通大学 | Novel single-polarization multi-wavelength polarization-preserving sampling optical fiber optical grating laser |
| CN201213194Y (en) * | 2008-06-03 | 2009-03-25 | 北京交通大学 | Linear cavity multiple wavelength dual path outputting optical fiber laser |
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- 2011-12-16 CN CN2011104216853A patent/CN102522681A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6041070A (en) * | 1997-11-14 | 2000-03-21 | Sdl, Inc. | Resonant pumped short cavity fiber laser |
| CN101222106A (en) * | 2007-12-26 | 2008-07-16 | 北京交通大学 | Novel single-polarization multi-wavelength polarization-preserving sampling optical fiber optical grating laser |
| CN201213194Y (en) * | 2008-06-03 | 2009-03-25 | 北京交通大学 | Linear cavity multiple wavelength dual path outputting optical fiber laser |
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Application publication date: 20120627 |