CN211789975U - Wavelength interval adjustable high-stability multi-wavelength fiber laser - Google Patents
Wavelength interval adjustable high-stability multi-wavelength fiber laser Download PDFInfo
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- CN211789975U CN211789975U CN202020219494.3U CN202020219494U CN211789975U CN 211789975 U CN211789975 U CN 211789975U CN 202020219494 U CN202020219494 U CN 202020219494U CN 211789975 U CN211789975 U CN 211789975U
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- 239000000835 fiber Substances 0.000 title claims abstract description 88
- 230000010287 polarization Effects 0.000 claims abstract description 47
- 229910052769 Ytterbium Inorganic materials 0.000 claims 2
- NAWDYIZEMPQZHO-UHFFFAOYSA-N ytterbium Chemical compound [Yb] NAWDYIZEMPQZHO-UHFFFAOYSA-N 0.000 claims 2
- 229910052691 Erbium Inorganic materials 0.000 claims 1
- 229910052775 Thulium Inorganic materials 0.000 claims 1
- UYAHIZSMUZPPFV-UHFFFAOYSA-N erbium Chemical compound [Er] UYAHIZSMUZPPFV-UHFFFAOYSA-N 0.000 claims 1
- FRNOGLGSGLTDKL-UHFFFAOYSA-N thulium atom Chemical compound [Tm] FRNOGLGSGLTDKL-UHFFFAOYSA-N 0.000 claims 1
- 239000013307 optical fiber Substances 0.000 abstract description 44
- 238000004891 communication Methods 0.000 abstract description 11
- 238000000926 separation method Methods 0.000 abstract 1
- 230000003287 optical effect Effects 0.000 description 7
- 238000005086 pumping Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
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- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
A high-stability multi-wavelength fiber laser with adjustable wavelength interval belongs to the field of fiber communication and instruments and meters. The laser is characterized in that a second polarization controller (09), a first polarization-maintaining fiber (10), a third polarization controller (11) and a second polarization-maintaining fiber (12) are sequentially connected between interfaces 081 and 082 of a first optical fiber coupler (08) to form a dual-order Sagnac filter; the NALM-NOLM optical fiber laser comprises a pump (01), a wavelength division multiplexer (02), a doped optical fiber (03), an optical fiber coupler I (04), a high nonlinear optical fiber (05), a polarization controller I (06) and an optical fiber coupler II (07) which jointly form an NALM-NOLM structure, mode competition is inhibited, and the stability of laser output is greatly improved. Adjusting the two polarization controllers in the filter can achieve a change in the wavelength separation. The laser has the advantages of simple structure, flexible output wavelength and the like, and is suitable for a wavelength division multiplexing system.
Description
Technical Field
The utility model relates to a wavelength interval adjustable high stability multi-wavelength fiber laser belongs to fiber communication, instrument and meter field.
Background
With the rapid rise of the information technology industry of the modern society, the number of users of the global internet is exponentially increased, the communication capacity is continuously increased, and the dense wavelength division multiplexing system can effectively improve the communication capacity by increasing the number of channels of the system. The working principle of the system is that a plurality of wavelength optical signals are multiplexed into optical fibers for transmission, a laser light source signal used by the system is a DFB semiconductor laser array, each laser in the array lases to output one light source signal, and although the idea and thought are simple, the cost and complexity of the communication system can be greatly improved. The multi-wavelength fiber laser has the advantages of simple structure, low cost, capability of simultaneously and stably outputting a plurality of wavelengths and the like, and has wide application in the fields of fiber communication, optical signal processing, optical sensing, microwave photon technology and the like. The basic components of the multi-wavelength fiber laser are as follows: rare earth doped gain fibers and pump sources, mechanisms to suppress mode competition, and filters containing multiple optical channels. With the continuous and deep research, people have designed various multi-wavelength lasers, such as narrow linewidth multi-wavelength lasers, wavelength range adjustable multi-wavelength lasers, wavelength interval adjustable multi-wavelength lasers, and the like. The development of optical communication systems has been greatly facilitated by the introduction of these lasers.
The multi-wavelength laser with the variable wavelength interval can meet the requirements of communication networks with different channel intervals, is beneficial to improving the flexibility of the communication networks, reduces the cost and the complexity, and has important significance for the development of the future communication networks. In addition, the output stability of the multi-wavelength laser has also received general attention, and researchers have proposed various structures to improve the stability of multi-wavelength, such as using nonlinear polarization rotation, nonlinear optical loop mirrors, and the like. The utility model discloses use all-fiber structure, cascade comb filter and NALM-NOLM structure, through adjusting polarization controller, can improve the stability of multi-wavelength output, can change the wavelength interval of output wavelength simultaneously in a flexible way, be favorable to the application in optical communication system.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the main technical problem who solves is to many fiber laser at present when realizing multi-wavelength laser output, can't keep long-time stable problem, has provided a wavelength interval adjustable high stability multi-wavelength fiber laser.
The adopted technical scheme is as follows:
the device comprises a pumping light source, a wavelength division multiplexer, a doped optical fiber, a first optical fiber coupler, a second optical fiber coupler, a third optical fiber coupler, a first polarization-maintaining optical fiber and a second polarization-maintaining optical fiber which are different in length, a first polarization controller, a second polarization controller and a third polarization controller.
The pumping light source is connected with the input end of the wavelength division multiplexer, the first port of the wavelength division multiplexer is connected with one end of the doped optical fiber, and the second port of the wavelength division multiplexer is connected with the third port of the optical fiber coupler. And a port IV of the doped optical fiber is connected with a first optical fiber coupler, and a port V on the right side of the first optical fiber coupler is connected with a port VI on the right side of the second optical fiber coupler. And a high nonlinear optical fiber and a first polarization controller are sequentially connected between the other port on the right side of the first optical fiber coupler and the port seven on the left side of the second optical fiber coupler. And a second polarization-maintaining optical fiber, a first polarization-maintaining optical fiber, a third polarization-maintaining optical fiber and a second polarization-maintaining optical fiber are sequentially connected between the port ten and the port nine on the right side of the third optical fiber coupler.
The doped optical fiber is a doped optical fiber, an ytterbium-doped optical fiber and a thulium-doped optical fiber.
The utility model discloses the effect that has as follows:
a high stability multi-wavelength laser with variable wavelength interval is provided. The laser uses a two-stage Sagnac filter in cascade with a NALM-NOLM structure. The double-order Sagnac filter is used as a wavelength selection element, a second polarization controller and a third polarization controller in the filter are adjusted, and the interval of output wavelengths is changed. The NALM-NOLM structure is used for inhibiting wavelength competition in a laser cavity, and the stability of an output structure is improved. In addition, the position of the output wavelength can be changed to a certain extent by adjusting the first polarization controller in the NALM-NOLM structure, namely, the wavelength tuning is realized.
Drawings
Fig. 1 is a diagram of a high-stability multi-wavelength fiber laser with adjustable wavelength interval.
FIG. 2 is a schematic diagram of wavelength interval variation of a wavelength interval tunable high-stability multi-wavelength fiber laser, in which (a) the wavelength interval is Δ λ1Graph (b) has a wavelength interval of Δ λ2(Δλ1≠Δλ2)。
Fig. 3 is a schematic diagram of wavelength tuning of a wavelength spaced tunable high stability multi-wavelength fiber laser.
Detailed Description
The utility model is further explained with the attached drawings.
Implementation mode one
A multi-wavelength fiber laser with adjustable wavelength interval and high stability is shown in figure 1 and comprises a pumping light source 01, a wavelength division multiplexer 02, a doped fiber 03, a fiber coupler I04, a high nonlinear fiber 05, a polarization controller I06, a fiber coupler II 07, a fiber coupler III 08, a polarization controller II 09, a polarization maintaining fiber I10, a polarization controller III 11 and a polarization maintaining fiber II 12.
The pumping light source 01 is connected with the input end of the wavelength division multiplexer 02, and the port I021 of the wavelength division multiplexer 02 is connected with one end of the doped fiber 03. The other port of the input end of the wavelength division multiplexer 02 is connected with the left port 071 of the second fiber coupler 07. The right port 031 of the doped fiber 03 is connected to the first fiber coupler 04, and the port 041 of the first fiber coupler 04 is connected to the second fiber coupler 07. The other port 042 of the first optical fiber coupler 04 and the port 072 of the second optical fiber coupler 07 are connected with the high nonlinear optical fiber 05 and the first polarization controller 06 at one time to form a NALM-NOLM structure. The right port 073 of the second optical fiber coupler 07 is connected with the left side of the third optical fiber coupler 08, and a polarization controller II 09, a polarization maintaining optical fiber I10, a polarization controller III 11 and a polarization maintaining optical fiber II 12 are sequentially connected between the left port 081 and the right port 082 of the optical fiber coupler 08, so that a dual-order Sagnac filter is formed. And the second port 083 on the left side of the fiber coupler three 08 is used as an output port of the laser. The lengths of the first polarization maintaining fiber 10 and the second polarization maintaining fiber 12 are different.
The second embodiment is different from the first embodiment in that
The doped fiber 03 is an ytterbium-doped fiber, the length of the high nonlinear fiber 05 is more than 100 meters, and the length difference between the polarization maintaining fiber I (10) and the polarization maintaining fiber II (12) is more than or equal to 0.5 meter.
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 high nonlinear optical fiber 05 is more than 120 meters, and the length difference between the polarization maintaining optical fiber I (10) and the polarization maintaining optical fiber II (12) is more than or equal to 0.8 meter.
Claims (6)
1. A wavelength interval adjustable high stability multi-wavelength fiber laser is characterized in that:
the polarization maintaining fiber coupler comprises a pump light source (01), a wavelength division multiplexer (02), a doped fiber (03), a fiber coupler I (04), a high nonlinear fiber (05), a polarization controller I (06), a fiber coupler II (07), a fiber coupler III (08), a polarization controller II (09), a polarization maintaining fiber I (10), a polarization controller III (11) and a polarization maintaining fiber II (12), wherein the pump light source (01) is connected with the input end of the wavelength division multiplexer (02), a port I021 of the wavelength division multiplexer (02) is connected with one end of the doped fiber (03), the other port of the input end of the wavelength division multiplexer (02) is connected with a left port 071 of the fiber coupler II (07), a right port 031 of the doped fiber (03) is connected with the fiber coupler I (04), a port 041 of the fiber coupler I (04) is connected with the fiber coupler II (07), and the other port 042 of the fiber coupler I (04) and the port 072 of the fiber coupler II (07) are connected at one time The polarization maintaining fiber laser comprises a nonlinear fiber (05) and a first polarization controller (06), a right port 073 of a second fiber coupler (07) is connected with the left side of a third fiber coupler (08), a second polarization controller (09), a first polarization maintaining fiber (10), a third polarization controller (11) and a second polarization maintaining fiber (12) are sequentially connected between a left port 081 and a right port 082 of the third fiber coupler (08), and a left second port 083 of the third fiber coupler (08) serves as an output port of the laser.
2. A wavelength interval tunable high stability multi-wavelength fiber laser according to claim 1, wherein the doped fiber (03) comprises an erbium doped fiber, a ytterbium doped fiber or a thulium doped fiber.
3. A wavelength interval tunable high stability multi-wavelength fiber laser according to claim 1, wherein the lengths of the first polarization maintaining fiber (10) and the second polarization maintaining fiber (12) are different.
4. The fiber laser of claim 1, wherein the splitting ratio of the first fiber coupler (04), the second fiber coupler (07) and the third fiber coupler (08) is 50:50, 70:30, 80:20, or 90: 10.
5. The fiber laser of claim 1, wherein when the doped fiber (03) is ytterbium doped, the length of the highly nonlinear fiber (05) is greater than 100 meters, and the difference between the lengths of the first polarization maintaining fiber (10) and the second polarization maintaining fiber (12) is greater than or equal to 0.5 meter.
6. The high-stability multi-wavelength fiber laser with adjustable wavelength interval according to claim 1, wherein when the doped fiber (03) is a thulium-doped fiber, the length of the high-nonlinearity fiber (05) is greater than 120 m, and the difference between the lengths of the polarization maintaining fiber I (10) and the polarization maintaining fiber II (12) is greater than or equal to 0.8 m.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020219494.3U CN211789975U (en) | 2020-02-27 | 2020-02-27 | Wavelength interval adjustable high-stability multi-wavelength fiber laser |
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| CN202020219494.3U CN211789975U (en) | 2020-02-27 | 2020-02-27 | Wavelength interval adjustable high-stability multi-wavelength fiber laser |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111244740A (en) * | 2020-02-27 | 2020-06-05 | 北京交通大学 | Wavelength interval adjustable high-stability multi-wavelength fiber laser |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111244740A (en) * | 2020-02-27 | 2020-06-05 | 北京交通大学 | Wavelength interval adjustable high-stability multi-wavelength fiber laser |
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