CN209929673U - Bidirectional pumping double-cladding optical fiber laser amplifier with SBS (styrene-butadiene-styrene) inhibiting function - Google Patents
Bidirectional pumping double-cladding optical fiber laser amplifier with SBS (styrene-butadiene-styrene) inhibiting function Download PDFInfo
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- CN209929673U CN209929673U CN201920178818.0U CN201920178818U CN209929673U CN 209929673 U CN209929673 U CN 209929673U CN 201920178818 U CN201920178818 U CN 201920178818U CN 209929673 U CN209929673 U CN 209929673U
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- 230000002457 bidirectional effect Effects 0.000 title claims description 15
- FACXGONDLDSNOE-UHFFFAOYSA-N buta-1,3-diene;styrene Chemical compound C=CC=C.C=CC1=CC=CC=C1.C=CC1=CC=CC=C1 FACXGONDLDSNOE-UHFFFAOYSA-N 0.000 title description 21
- 229920000468 styrene butadiene styrene block copolymer Polymers 0.000 title description 21
- 230000002401 inhibitory effect Effects 0.000 title description 4
- 239000000835 fiber Substances 0.000 claims abstract description 102
- 230000005540 biological transmission Effects 0.000 claims description 7
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- 238000010168 coupling process Methods 0.000 claims description 5
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- KWMNWMQPPKKDII-UHFFFAOYSA-N erbium ytterbium Chemical compound [Er].[Yb] KWMNWMQPPKKDII-UHFFFAOYSA-N 0.000 claims description 5
- 150000002500 ions Chemical class 0.000 claims description 4
- 239000004065 semiconductor Substances 0.000 claims description 4
- 229910052691 Erbium Inorganic materials 0.000 claims description 3
- 229910052689 Holmium Inorganic materials 0.000 claims description 3
- 229910052779 Neodymium Inorganic materials 0.000 claims description 3
- 229910052775 Thulium Inorganic materials 0.000 claims description 3
- 229910052769 Ytterbium Inorganic materials 0.000 claims description 3
- UYAHIZSMUZPPFV-UHFFFAOYSA-N erbium Chemical compound [Er] UYAHIZSMUZPPFV-UHFFFAOYSA-N 0.000 claims description 3
- KJZYNXUDTRRSPN-UHFFFAOYSA-N holmium atom Chemical compound [Ho] KJZYNXUDTRRSPN-UHFFFAOYSA-N 0.000 claims description 3
- QEFYFXOXNSNQGX-UHFFFAOYSA-N neodymium atom Chemical compound [Nd] QEFYFXOXNSNQGX-UHFFFAOYSA-N 0.000 claims description 3
- 238000001228 spectrum Methods 0.000 claims description 3
- NAWDYIZEMPQZHO-UHFFFAOYSA-N ytterbium Chemical compound [Yb] NAWDYIZEMPQZHO-UHFFFAOYSA-N 0.000 claims description 3
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Abstract
The utility model relates to an optical fiber laser field, for SBS threshold value in improving optical fiber laser MOPA, the lowering system complexity realizes efficient laser output, the utility model discloses, two-way pumping double-clad fiber laser amplifier with restrain SBS effect, include: the device comprises a laser seed source, an optical fiber isolator, a first optical fiber combiner, a first double-cladding active optical fiber, a cladding light stripper, a second double-cladding active optical fiber, a second optical fiber combiner, an optical fiber end cap and a pumping source; seed light enters the fiber core of the first double-cladding active optical fiber through the optical fiber isolator and then enters the fiber core of the second double-cladding active optical fiber through the cladding light stripper; the pump light emitted by the pump source is coupled into the cladding of the first active fiber and the cladding of the second active fiber in a positive and negative way through the pump ends of the first optical fiber beam combiner and the second optical fiber beam combiner respectively; the double-cladding active optical fiber absorbs the pump light, provides gain for the signal light and then outputs the signal light. The utility model discloses mainly be applied to laser instrument manufacturing and designing occasion.
Description
Technical Field
The utility model relates to an optical fiber laser field, a two-way pumping double-clad fiber laser amplifier with restrain SBS effect.
Background
In order to obtain high-power and high-performance fiber laser output, a Main Oscillation Power Amplifier (MOPA) structure with a double-clad active fiber as a gain medium is generally adopted. Currently, commonly used pumping structures of fiber amplifiers include three types, i.e., forward pumping, backward pumping, and bidirectional pumping. Amplifiers in a forward pumped configuration have a higher output optical signal-to-noise ratio but a lower slope efficiency. The reverse pumping structure can realize higher slope efficiency, has a certain inhibiting effect on nonlinear effect, but has the problem of stronger stimulated spontaneous emission (ASE) and lower output signal-to-noise ratio. The bidirectional pump integrates the advantages of the first two pump structures, has relatively high slope efficiency and signal-to-noise ratio, is the best pump structure for realizing high-power narrow-linewidth laser output, and has been widely applied to single-cladding optical fiber amplifiers. However, in the double-clad fiber laser amplifier, the pump light is coupled into the inner cladding of the active fiber through the fiber combiner for pumping, and a cladding light stripper matched with the active fiber needs to be welded at the tail end of the active fiber to remove the residual pump light, so as to avoid damaging the later-stage devices. When a bidirectional pump structure is used, two cladding light strippers are required to remove the forward and reverse residual pump light, respectively, inevitably increasing the laser link loss and complexity of the amplification system.
In addition, nonlinear effects in the optical fiber, such as Stimulated Brillouin Scattering (SBS), Stimulated Raman Scattering (SRS), etc., are one of the main factors that limit the laser power level of the optical fiber. Especially in a high-power narrow-linewidth optical fiber laser amplifier, the linewidth of signal light is very narrow, so that the SBS phenomenon is easy to occur, and the output slope efficiency and the signal-to-noise ratio are influenced. In the prior art, in order to inhibit the SBS effect, an additional device is needed to add a temperature gradient or a stress gradient to the double-clad gain fiber, or a high-price large-mode-field-area double-clad active fiber is adopted for amplification, so that the device cost is high, and the structure of an amplification system is complex.
Disclosure of Invention
For overcoming the not enough of prior art, the utility model aims at providing a two-way pumping double-clad fiber laser amplifier who restraines SBS effect, improves SBS threshold value in the fiber laser MOPA, and the lowering system complexity realizes efficient laser output, for this reason, the utility model discloses a technical scheme be, have the two-way pumping double-clad fiber laser amplifier who restraines SBS effect, include: the device comprises a laser seed source, an optical fiber isolator, a first optical fiber combiner, a first double-cladding active optical fiber, a cladding light stripper, a second double-cladding active optical fiber, a second optical fiber combiner, an optical fiber end cap and a pumping source; the laser seed source emits signal light, and the seed light enters the fiber core of the first double-cladding active optical fiber through the optical fiber isolator and then enters the fiber core of the second double-cladding active optical fiber through the cladding light stripper; the pump light emitted by the pump source respectively enters the cladding of the first active fiber and the cladding of the second active fiber through the forward and backward coupling of the pump ends of the first fiber combiner and the second fiber combiner to realize bidirectional pumping; the double-clad active optical fiber absorbs the pump light to form population inversion, and gain is provided for the signal light; and amplifying the signal light, and outputting the amplified signal light through the signal end of the second optical fiber beam combiner and the optical fiber end cap.
The input end optical fiber and the output end optical fiber of the cladding light stripper are respectively matched optical fibers of a first double-cladding active optical fiber and a second double-cladding active optical fiber, are arranged between the first double-cladding active optical fiber and the second double-cladding active optical fiber and are used for stripping residual pump light transmitted in the forward direction and the reverse direction, and the core diameter of the input end optical fiber is smaller than that of the output end optical fiber and is used for improving the reverse transmission loss of Stokes light.
The first double-clad active fiber and the second double-clad active fiber can be erbium-ytterbium co-doped fibers, or active fibers doped with active ions of erbium, ytterbium, thulium, holmium or neodymium, and respectively correspond to different signal light wavelengths.
The laser seed source can be a fiber laser or a semiconductor laser, and the emission wavelength of the laser seed source can be within the gain spectrum of the first double-cladding active fiber and the second double-cladding active fiber; the laser seed source may be operated in continuous wave mode, or in modulation, Q-switching or mode-locking mode.
The utility model discloses a characteristics and beneficial effect are:
the residual pump light transmitted in the forward and reverse directions is simultaneously stripped by a single cladding light stripper, so that the double-cladding active optical fiber bidirectional pumping is realized. The input and output optical fibers of the cladding light stripper have different core diameters, play a role in improving the Stokes light transmission loss, can improve the SBS threshold of the amplifier, and effectively inhibit the SBS effect in the amplifier. The amplifier does not need other additional equipment, has a simple and compact structure, and is beneficial to realizing the laser output with high power, high signal-to-noise ratio and narrow line width.
Description of the drawings:
fig. 1 is a specific embodiment of a bidirectional pump double-clad fiber laser amplifier with SBS suppressing effect according to the present invention, and fig. 2 is a schematic structural view of a component clad light stripper 5 in the amplifier according to the present invention;
in the drawings, the components represented by the respective reference numerals are listed below:
1: a laser seed source; 2: a fiber isolator;
3: a first optical fiber combiner; 4: a first double-clad active optical fiber;
5: a cladding light stripper; 6: a second double clad active fiber;
7: a second optical fiber combiner; 8: an optical fiber end cap;
9: a pump source; 10: input optical fiber of clad light stripper 5
11: an output optical fiber of the cladding light stripper 5; 12: high refractive index matching glue;
13; a heat sink.
Detailed Description
A bi-directionally pumped double-clad fiber laser amplifier with SBS suppression, the fiber laser amplifier comprising: the device comprises a laser seed source, an optical fiber isolator, a first optical fiber combiner, a first double-cladding active optical fiber, a cladding light stripper, a second double-cladding active optical fiber, a second optical fiber combiner, an optical fiber end cap and a pumping source. The laser seed source emits signal light, and the seed light enters the fiber core of the first double-cladding active optical fiber through the optical fiber isolator and then enters the fiber core of the second double-cladding active optical fiber through the cladding light stripper. And the pump light emitted by the pump source respectively enters the cladding of the first active fiber and the cladding of the second active fiber through the forward and backward coupling of the pump ends of the first fiber combiner and the second fiber combiner, so that bidirectional pumping is realized. The double-clad active optical fiber absorbs the pump light to form population inversion, and provides gain for the signal light. And amplifying the signal light, and outputting the amplified signal light through the signal end of the second optical fiber beam combiner and the optical fiber end cap.
The input end and the output end of the cladding light stripper are respectively matched fibers of a first double-cladding active fiber and a second double-cladding active fiber, and the matching fibers are arranged between the first double-cladding active fiber and the second double-cladding active fiber and used for stripping residual pump light transmitted in the forward direction and the reverse direction. And the core diameter of the input end optical fiber is smaller than that of the output end optical fiber, and the optical fiber is used for improving the reverse transmission loss of Stokes light.
In the amplification process, when Brillouin scattering is generated in the second double-clad active optical fiber, only a small amount of backward-transmitted Stokes light is coupled into the first double-clad active optical fiber through the cladding light stripper, so that the formation of lasing caused by overhigh gain is avoided, and the SBS effect in the amplifier is suppressed.
In order to make the objects, technical solutions and advantages of the present invention clearer, embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
The embodiment of the utility model provides a two-way pumping double-clad fiber laser amplifier with restrain SBS effect, fiber laser amplifier structure refers to figure 1, the utility model discloses in the implementation, peel off positive reverse transmission's remaining pump light simultaneously through single cladding light stripper, realize two-way pumping double-clad active optical fiber. The input end and the output end of the cladding light stripper have different fiber core diameters, so that the effect of improving Stokes light transmission loss is achieved, and the SBS effect in the amplifier can be inhibited. See the description below for details:
the fiber laser amplifier includes: the device comprises a laser seed source 1, an optical fiber isolator 2, a first optical fiber combiner 3, a first double-cladding active optical fiber 4, a cladding light stripper 5, a second double-cladding active optical fiber 6, a second optical fiber combiner 7, an optical fiber end cap 8 and a pumping source 9. Wherein,
the output wavelength of the laser seed source 1 is 1550nm, and the output optical fiber is 6/125 single-mode optical fiber; the optical fiber isolator 2 is an optical fiber coupling device, and the diameter of an optical fiber core is 6 mu m; the first optical fiber combiner 3 is a (2+1) x 1 optical fiber combiner, the signal fiber is an 6/125 double-clad optical fiber, and the pump-end optical fiber is a 105/125 multimode optical fiber; the first double-clad active fiber 4 is erbium ytterbium co-doped fiber, and the diameters of the fiber core and the inner cladding are respectively 6 mu m and 125 mu m; the input end optical fiber 10 of the cladding light stripper 5 is 6/125 double-cladding passive optical fiber, which is a matching optical fiber of the first double-cladding active optical fiber 4, and the core diameter of the optical fiber is 6 μm. The output end optical fiber 12 is 12/130 double-clad passive optical fiber and is a matching optical fiber of the second double-clad active optical fiber 6, and the core diameter of the optical fiber is 12 mu m. The bare fiber near the fusion point between the input optical fiber 10 and the output optical fiber 11 of the clad light stripper 5 is coated with a high refractive index glue 12, the coating length is not less than 6cm, and the fusion point is placed on a heat sink 13. The second double-clad active optical fiber 6 is an erbium-ytterbium co-doped optical fiber, and the diameters of the fiber core and the inner cladding are respectively 12 micrometers and 130 micrometers; the second optical fiber combiner 7 is a (2+1) × 1 optical fiber combiner, the signal fiber is 12/130 double-clad fiber, and the pump-end fiber is 105/125 multimode fiber. The output wavelength of the pump source 9 is 976nm, and the coupling output fiber is 105/125 multimode fiber.
The laser seed source 1 emits seed light, which enters the first double-clad active optical fiber 4 through the optical fiber isolator 2. The pump light emitted from the pump source 9 is passed through the first fiber combiner 3 to pump the first double-clad active fiber 4 in the forward direction. The amplified signal enters the second double-clad active optical fiber 6 through the clad optical stripper 5. The pump source 9 reversely pumps the second double-clad active fiber 6 through the second fiber combiner 7 to realize bidirectional pumping. And finally, outputting the amplified signal through a signal end of a second optical fiber beam combiner 7 and an optical fiber end cap 8.
In the amplification process, the cladding light stripper 5 strips the residual pump light transmitted in the forward and reverse directions simultaneously, so as to realize bidirectional pumping. When brillouin scattering is generated in the second double-clad active fiber 6, since the core diameter of the input end fiber 10 of the clad light stripper 5 is smaller than that of the output end fiber 11, only a small amount of backward-transmitted stokes light is coupled into the first double-clad active fiber 4 through the clad light stripper 5, thereby avoiding the formation of lasing due to too high gain of the stokes light, and inhibiting the SBS effect in the amplifier.
Wherein, first double-clad active fiber 4 and second double-clad active fiber 6 can be erbium ytterbium codoped fiber, also can be the active fiber of the commonly used active ion such as doping erbium, ytterbium, thulium, holmium, neodymium, correspond different signal light wavelength respectively, the embodiment of the utility model provides a do not restrict to this.
Wherein, the core diameter of the second double-clad active optical fiber 6 only needs to satisfy the core diameter greater than the first double-clad active optical fiber 4, and the embodiment of the present invention does not limit this.
Wherein, laser seed source 1 can be fiber laser, also can be semiconductor laser or other lasers, only need satisfy its emission wavelength be located first, second double-clad active optical fiber 4 and 6 gain spectrum in can, the embodiment of the utility model provides a do not restrict to this.
Wherein, laser seed source 1 can be continuous wave operation, also can be other forms such as modulation, transfer Q, mode locking operation, the embodiment of the utility model provides a do not limit to this.
Wherein, pump source 9 can be semiconductor laser, also can be the laser instrument of other forms such as optic fibre, solid, and its output wavelength can be 976nm, also can 915nm, also can be other wavelengths when using the active optical fiber who dopes other ions, as long as the absorption peak that corresponds active optical fiber can, the embodiment of the utility model provides a do not restrict to this.
In summary, the embodiment of the present invention provides a bidirectional pumping double-clad fiber laser amplifier with SBS suppressing function, which realizes bidirectional pumping of the double-clad fiber amplifier by connecting two-end gain fibers through a cladding light stripper; the core diameters of the input end and the output end of the cladding light stripper are different, so that the effect of improving Stokes light transmission loss is achieved, and the SBS effect in the optical fiber amplifier can be inhibited. The method does not need other devices and has the advantages of simple structure, high signal-to-noise ratio, high output efficiency and the like.
Those skilled in the art will appreciate that the drawings are only schematic illustrations of preferred embodiments, and the embodiments of the present invention are given the same reference numerals and are not intended to represent the merits of the embodiments.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (4)
1. A bidirectional pumping double-clad fiber laser amplifier with SBS suppressing function is characterized by comprising: the device comprises a laser seed source, an optical fiber isolator, a first optical fiber combiner, a first double-cladding active optical fiber, a cladding light stripper, a second double-cladding active optical fiber, a second optical fiber combiner, an optical fiber end cap and a pumping source; the laser seed source emits signal light, and the seed light enters the fiber core of the first double-cladding active optical fiber through the optical fiber isolator and then enters the fiber core of the second double-cladding active optical fiber through the cladding light stripper; the pump light emitted by the pump source respectively enters the cladding of the first active fiber and the cladding of the second active fiber through the forward and backward coupling of the pump ends of the first fiber combiner and the second fiber combiner to realize bidirectional pumping; the double-clad active optical fiber absorbs the pump light to form population inversion, and gain is provided for the signal light; and amplifying the signal light, and outputting the amplified signal light through the signal end of the second optical fiber beam combiner and the optical fiber end cap.
2. The laser amplifier as claimed in claim 1, wherein the input and output fibers of the cladding light stripper are respectively matched fibers of the first and second double-clad active fibers, and are disposed between the first and second double-clad active fibers for stripping residual pump light transmitted in forward and reverse directions, and the core diameter of the input fiber is smaller than that of the output fiber for increasing the reverse transmission loss of stokes light.
3. The two-way pumped double-clad fiber laser amplifier according to claim 1, wherein the first double-clad active fiber and the second double-clad active fiber are erbium-ytterbium co-doped fibers or active fibers doped with active ions of erbium, ytterbium, thulium, holmium or neodymium, respectively corresponding to different wavelengths of signal light.
4. The two-way pumped double-clad fiber laser amplifier with SBS suppressing function as claimed in claim 1, wherein the laser seed source is a fiber laser or a semiconductor laser, only if its emission wavelength is within the gain spectrum of the first and second double-clad active fibers; the laser seed source is operated in continuous wave mode or in modulation, Q-switching or mode-locking mode.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117353141A (en) * | 2023-11-02 | 2024-01-05 | 上海频准激光科技有限公司 | Optical fiber amplifier and amplifying method for suppressing self-oscillation when amplifying edge wavelength |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117353141A (en) * | 2023-11-02 | 2024-01-05 | 上海频准激光科技有限公司 | Optical fiber amplifier and amplifying method for suppressing self-oscillation when amplifying edge wavelength |
| CN117353141B (en) * | 2023-11-02 | 2024-04-16 | 上海频准激光科技有限公司 | Optical fiber amplifier and amplifying method for suppressing self-oscillation when amplifying edge wavelength |
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