CN211182779U - Tunable multi-wavelength fiber laser with all-fiber wavelength interval variable - Google Patents
Tunable multi-wavelength fiber laser with all-fiber wavelength interval variable Download PDFInfo
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- CN211182779U CN211182779U CN201921795891.9U CN201921795891U CN211182779U CN 211182779 U CN211182779 U CN 211182779U CN 201921795891 U CN201921795891 U CN 201921795891U CN 211182779 U CN211182779 U CN 211182779U
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- 239000000835 fiber Substances 0.000 title claims abstract description 108
- 230000010287 polarization Effects 0.000 claims abstract description 62
- 239000013307 optical fiber Substances 0.000 claims description 53
- 238000005086 pumping Methods 0.000 claims description 5
- 229910052775 Thulium Inorganic materials 0.000 claims 1
- FRNOGLGSGLTDKL-UHFFFAOYSA-N thulium atom Chemical compound [Tm] FRNOGLGSGLTDKL-UHFFFAOYSA-N 0.000 claims 1
- 238000004891 communication Methods 0.000 abstract description 7
- 238000010586 diagram Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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Abstract
A tunable multi-wavelength fiber laser with variable all-fiber wavelength interval belongs to the field of fiber communication and instruments and meters and can simultaneously realize tuning of a wavelength range and changing of the wavelength interval.A polarization controller I, a polarization maintaining fiber I, a polarization controller II and a polarization maintaining fiber II are sequentially connected between two ports of a fiber coupler I to form a dual-order Sagnac fiber filter with variable wavelength interval.A polarization related isolator, a polarization controller III and a polarization maintaining fiber III form an L yot filter.
Description
Technical Field
The utility model relates to a changeable tunable multi-wavelength fiber laser in full fiber wavelength interval belongs to optical fiber communication, instrument and meter field.
Background
Since the 21 st century, the human society has changed from the world to the earth, the scientific field has developed rapidly, and people's lives are changing day by day. The coming of the information era greatly increases the requirements of people on communication speed and communication capacity, and optical fiber communication is in force and plays an important role. At present, 100G optical fiber transmission networks have been commercialized, and as the amount of network data exponentially increases, the related technologies of 400G optical fiber transmission networks are mature day by day, and standardization work is steadily advancing. In optical networks, wavelength division multiplexing is a commonly used technique that uses a plurality of channels of different wavelengths to transmit information. Typically, generating multiple wavelengths requires multiple laser sources, which can add significant cost to the system if a single wavelength laser is utilized. The multi-wavelength fiber laser has the advantages of high performance, compact structure, low cost and low insertion loss, can simultaneously provide a plurality of wavelengths to meet the needs of a system, and is an effective scheme for reducing the number of lasers and the cost of the system. In recent years, researchers have designed various types of multi-wavelength fiber lasers, such as fiber grating-based multi-wavelength single longitudinal mode fiber lasers, few-mode multi-wavelength lasers, brillouin erbium-doped fiber lasers, and the like.
In addition, multi-wavelength lasers with tunable wavelength ranges and variable wavelength intervals have gained great attention, and their proposals have increased the flexibility of the system. The tunable multi-wavelength fiber laser with the variable wavelength interval is formed by combining the two optical fibers, is better suitable for a system, meets different requirements in an optical communication system, reduces the cost and complexity of the system, and has important significance for the development of a future communication network.
The utility model discloses use all-fiber structure, through adjusting three polarization controller, realize the wavelength output of different scopes, can change the wavelength interval of multi-wavelength simultaneously in a flexible way, also can realize the change of wavelength quantity to a certain extent in addition.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem of main solution is when realizing that the scope of output wavelength is tunable to many fiber laser at present, can't carry out the problem that changes to the interval of wavelength, has provided a changeable tunable multi-wavelength fiber laser in full fiber output wavelength interval.
The specific scheme adopted is as follows:
the polarization-maintaining fiber laser comprises a pumping light source, a wavelength division multiplexer, a doped fiber, a high-nonlinearity fiber, a first fiber coupler, a second fiber coupler, a first polarization-maintaining fiber, a second polarization-maintaining fiber, a third polarization-maintaining fiber, a first polarization controller, a second polarization controller, a third polarization controller, a fiber circulator and a polarization-related isolator.
The pump light source is connected with the input end on the right side of the wavelength division multiplexer, the port I on the left side of the wavelength division multiplexer is connected with one end of the doped optical fiber, the port II on the right side of the wavelength division multiplexer is connected with the port III of the optical fiber coupler II, and the port IV on the left side of the doped optical fiber is connected with the optical fiber circulator. And a port five of the optical fiber circulator is connected with a port on the right side of the optical fiber coupler I, and a polarization controller I, a polarization maintaining optical fiber I, a polarization controller II and a polarization maintaining optical fiber II are sequentially connected between a port six and a port seven of the optical fiber coupler I. The other port, namely the port eight, of the optical fiber circulator is connected with the polarization correlation isolator, the port nine on the right side of the polarization correlation isolator is connected with the polarization controller in three phases, and the second port on the right side of the polarization controller III is connected with the polarization-maintaining optical fiber III. And finally, connecting a port ten of the high nonlinear optical fiber with a port on the right side of the optical fiber coupler III. And the second port on the left side of the second optical fiber coupler is used as the output end of the laser.
The doped optical fiber comprises an erbium-doped optical fiber, an ytterbium-doped optical fiber and a thulium-doped optical fiber.
The utility model discloses the effect that has as follows:
the laser uses two polarization-maintaining optical fibers with different lengths and two polarization controllers to form a double-order Sagnac optical fiber filter with variable wavelength interval, uses a polarization-related isolator, a polarization controller and a polarization-maintaining optical fiber to form an L yot filter, and finally cascades the two optical fiber filters, adjusts the two polarization controllers in the double-order Sagnac filter with variable wavelength interval to realize the change of the wavelength interval, adjusts the polarization controller in L yot to realize the wavelength tuning in a large range, ensures that light is transmitted along the forward direction in a loop, and accesses a high-nonlinearity optical fiber to form a four-wave mixing effect to inhibit wavelength competition, obtain stable laser output, greatly increase the number of output wavelengths, and further realize the change of the number of the wavelengths to a certain degree.
Drawings
Fig. 1 is a schematic structural diagram of a tunable multi-wavelength fiber laser with variable all-fiber wavelength intervals.
Fig. 2 is a schematic diagram of wavelength tuning of an all-fiber variable wavelength spacing tunable multi-wavelength fiber laser.
Fig. 3 is a schematic diagram of wavelength interval variation of a tunable multi-wavelength fiber laser with an all-fiber wavelength interval variable, where (a) shows a wavelength interval Δ λ and (b) shows a wavelength interval Δ λ '(Δ λ ≠ Δ λ').
Fig. 4 is a schematic diagram of the variation of the number of wavelengths of a tunable multi-wavelength fiber laser with variable all-fiber wavelength spacing, where (a) shows the number of wavelengths m (m >0) and (b) shows the number of wavelengths n (n >0) (m ≠ n).
Detailed Description
The invention is further described below with reference to the accompanying drawings.
Implementation mode one
A tunable multi-wavelength fiber laser with variable wavelength interval is shown in figure 1 and comprises a pumping light source 01, a wavelength division multiplexer 02, a doped fiber 03, a fiber circulator 04, a fiber coupler I05, a polarization controller I06, a polarization maintaining fiber I07, a polarization controller II 08, a polarization maintaining fiber II 09, a polarization correlation isolator 10, a polarization controller III 11, a polarization maintaining fiber III 12, a high nonlinear fiber 13 and a fiber coupler II 14.
The pumping light source 01 is connected with an input end 021 of the wavelength division multiplexer 02, a first port 023 of the wavelength division multiplexer is connected with one end of the doped optical fiber 03, a second port 022 of the wavelength division multiplexer on the right side is connected with a third port 142 of the optical fiber coupler II, and a fourth port 041 of the doped optical fiber 03 is connected with the optical fiber circulator. Port five 042 of the fiber optic circulator is connected to the right port of the first fiber coupler 05. And a first polarization controller 06, a first polarization maintaining fiber 07, a second polarization controller 08 and a second polarization maintaining fiber 09 are sequentially connected between a sixth port 052 and a seventh port 051 of the first optical fiber coupler 05. The other port 043 of the optical fiber circulator 04 is connected with the left side of the polarization-dependent isolator 10, the right port nine 101 of the polarization-dependent isolator is connected with the third polarization controller 11, and the second right port 111 of the third polarization controller 11 is connected with the third polarization-maintaining optical fiber 12. The third polarization maintaining fiber 12 is connected with the high nonlinear fiber 13, and the tenth port 131 of the high nonlinear fiber 13 is connected with the right port of the second fiber coupler 14. The second port 141 on the left side of the second fiber coupler 14 serves as the output end of the laser. The doped fiber 03 is an erbium-doped fiber, the lengths of the first polarization maintaining fiber 07 and the second polarization maintaining fiber 09 are different, the length of the third polarization maintaining fiber 12 is less than 0.2 meter, and the length of the high nonlinear fiber 13 is greater than 200 meters.
The second embodiment is different from the first embodiment in that
The doped fiber 03 is an ytterbium-doped fiber, the length of the polarization-maintaining fiber III 12 is less than 0.15 meter, and the length of the high-nonlinearity fiber 13 is more than 100 meters.
The third embodiment is different from the first and second embodiments in that
The doped optical fiber 03 is a thulium-doped optical fiber, the length of the polarization maintaining optical fiber III 12 is less than 2 meters, and the length of the high nonlinear optical fiber 13 is more than 150 meters.
Claims (6)
1. A tunable multi-wavelength fiber laser with variable all-fiber wavelength interval is characterized in that:
the polarization-maintaining optical fiber circulator comprises a pumping light source (01), a wavelength division multiplexer (02), a doped optical fiber (03), an optical fiber circulator (04), an optical fiber coupler I (05), a polarization controller I (06), a polarization-maintaining optical fiber I (07), a polarization controller II (08), a polarization-maintaining optical fiber II (09), a polarization-related isolator (10), a polarization controller III (11), a polarization-maintaining optical fiber III (12), a high nonlinear optical fiber (13) and an optical fiber coupler II (14), wherein the pumping light source (01) is connected with an input end (021) of the wavelength division multiplexer (02), a left port I (023) of the wavelength division multiplexer is connected with one end of the doped optical fiber (03), a port II (022) on the right side of the wavelength division multiplexer is connected with a port III (142) of the optical fiber coupler II, a left port IV (041) of the doped optical fiber (03) is connected with, a polarization controller I (06), a polarization maintaining fiber I (07), a polarization controller II (08) and a polarization maintaining fiber II (09) are sequentially connected between a port six (052) and a port seven (051) of a fiber coupler I (05), the other port (043) of a fiber circulator (04) is connected with the left side of a polarization related isolator (10), a right port nine (101) of the polarization related isolator is connected with a polarization controller III (11), a right second port (111) of the polarization controller III (11) is connected with a polarization maintaining fiber III (12), the polarization maintaining fiber III (12) is connected with a high nonlinear fiber (13), a port ten (131) of the high nonlinear fiber (13) is connected with a right port of a fiber coupler II (14), a left second port (141) of the fiber coupler II (14) is used as the output end of the laser, wherein the lengths of the polarization maintaining optical fiber I (07) and the polarization maintaining optical fiber II (09) are different.
2. The all-fiber variable wavelength-spaced tunable multi-wavelength fiber laser of claim 1, wherein the doped fiber (03) comprises an erbium-doped fiber, an ytterbium-doped fiber, or a thulium-doped fiber.
3. The tunable multi-wavelength fiber laser with variable all-fiber wavelength interval according to claim 1, wherein when erbium-doped fiber is used as the gain fiber, the length of the polarization-maintaining fiber three (12) is less than 0.2 m, and the length of the highly nonlinear fiber (13) is greater than 200 m.
4. The tunable multi-wavelength fiber laser with an all-fiber wavelength interval variable according to claim 1, wherein when the ytterbium-doped fiber is used as the gain fiber, the length of the polarization-maintaining fiber III (12) is less than 0.15 m, and the length of the high-nonlinearity fiber (13) is greater than 100 m.
5. The tunable multi-wavelength fiber laser with variable all-fiber wavelength interval according to claim 1, wherein when the thulium doped fiber is used as the gain fiber, the length of the polarization maintaining fiber three (12) is less than 2 meters, and the length of the highly nonlinear fiber (13) is greater than 150 meters.
6. The all-fiber variable wavelength-spaced tunable multi-wavelength fiber laser of claim 1, wherein the splitting ratio of the second fiber coupler (14) is 50:50, 70:30, 80:20, or 90: 10.
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| CN201921795891.9U CN211182779U (en) | 2019-10-24 | 2019-10-24 | Tunable multi-wavelength fiber laser with all-fiber wavelength interval variable |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110635342A (en) * | 2019-10-24 | 2019-12-31 | 北京交通大学 | Tunable multi-wavelength fiber laser with all-fiber wavelength interval variable |
| CN114498262A (en) * | 2021-12-31 | 2022-05-13 | 北京交通大学 | Multi-wavelength switchable single longitudinal mode thulium-doped fiber laser |
| CN114498260A (en) * | 2021-12-31 | 2022-05-13 | 北京交通大学 | Stable switchable wavelength pulse fiber laser |
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2019
- 2019-10-24 CN CN201921795891.9U patent/CN211182779U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110635342A (en) * | 2019-10-24 | 2019-12-31 | 北京交通大学 | Tunable multi-wavelength fiber laser with all-fiber wavelength interval variable |
| CN114498262A (en) * | 2021-12-31 | 2022-05-13 | 北京交通大学 | Multi-wavelength switchable single longitudinal mode thulium-doped fiber laser |
| CN114498260A (en) * | 2021-12-31 | 2022-05-13 | 北京交通大学 | Stable switchable wavelength pulse fiber laser |
| CN114498262B (en) * | 2021-12-31 | 2023-11-07 | 北京交通大学 | Multi-wavelength switchable single-longitudinal-mode thulium-doped fiber laser |
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