CN114268008B - Vector soliton laser - Google Patents
Vector soliton laser Download PDFInfo
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- CN114268008B CN114268008B CN202111590354.2A CN202111590354A CN114268008B CN 114268008 B CN114268008 B CN 114268008B CN 202111590354 A CN202111590354 A CN 202111590354A CN 114268008 B CN114268008 B CN 114268008B
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Abstract
The application provides a vector soliton laser, and relates to the field of lasers; the vector soliton laser includes: the device comprises a pumping source, an optical fiber ring resonator, a second optical fiber coupler, a second polarization controller, a third polarization controller and a polarization beam combiner; the optical fiber ring resonant cavity is formed by sequentially connecting a saturable absorber, a first polarization controller, a first optical fiber coupler, an optical isolator, a wavelength division multiplexer and an erbium-doped optical fiber and is used for outputting scalar solitons; the pumping source is connected with the wavelength division multiplexer; the second optical fiber coupler is respectively connected with the first optical fiber coupler, the second polarization controller and the third polarization controller; the second polarization controller and the third polarization controller are respectively connected with the polarization beam combiner through polarization-preserving single-mode fibers; the second optical fiber coupler, the second polarization controller, the third polarization controller and the polarization beam combiner are matched and used for converting scalar solitons into vector solitons; the application can generate vector solitons outside the optical fiber ring resonator.
Description
Technical Field
The application relates to the field of lasers, in particular to a vector soliton laser.
Background
The single-mode fiber supports two orthogonal polarization modes, and if no polarization sensitive device exists in the mode-locked fiber resonant cavity, the two modes can be transmitted relatively independently to generate vector solitons. If the pulse exists in only a single polarization direction, it is called a scalar soliton. Scalar and vector solitons are each characterized by: the scalar soliton has single polarization state, simple operation and control and stable polarization splitting property. The vector soliton is relatively complex to operate, but plays an irreplaceable role in a 3D imaging and double optical comb measuring system by virtue of polarization diversity and multiplexing property. So far, many researches on directly generating vector solitons in a cavity of a mode-locked fiber laser are reported, but vector solitons synthesized outside the cavity of the scalar solitons are not reported.
Disclosure of Invention
The application aims to provide a vector soliton laser which can generate vector solitons outside an optical fiber ring resonator.
The application provides a vector soliton laser, comprising: the device comprises a pumping source, an optical fiber ring resonator, a second optical fiber coupler, a second polarization controller, a third polarization controller and a polarization beam combiner;
the optical fiber ring resonant cavity is formed by sequentially connecting a saturable absorber, a first polarization controller, a first optical fiber coupler, an optical isolator, a wavelength division multiplexer and an erbium-doped optical fiber and is used for outputting scalar solitons;
the pumping source is connected with the wavelength division multiplexer;
the second optical fiber coupler is respectively connected with the first optical fiber coupler, the second polarization controller and the third polarization controller; the second polarization controller and the third polarization controller are respectively connected with the polarization beam combiner through polarization-preserving single-mode fibers; the second optical fiber coupler, the second polarization controller, the third polarization controller and the polarization beam combiner are matched and used for converting the scalar soliton into a vector soliton.
Further, the pump source is a semiconductor laser coupled with a single-mode fiber.
Further, the power of the semiconductor laser is 80mW, and the wavelength is 980nm.
Further, the material of the saturable absorber is carbon nanotubes.
Further, the split ratio of the second optical fiber coupler is 50:50.
Further, the model of the erbium-doped fiber is Nufern ESF-7/125, and the length is 1m.
Further, the split ratio of the first optical fiber coupler is 10:90.
Further, the optical isolator employs a polarization dependent isolator having a center wavelength of 1550nm.
Further, the working wavelength of the wavelength division multiplexer is 980/1550nm.
Further, the vector soliton laser also comprises a fourth polarization controller and a polarization beam splitter; the polarization beam splitter is connected with the polarization beam combiner through the fourth polarization controller.
The technical scheme provided by the embodiment of the application has the beneficial effects that: the vector soliton laser in the embodiment of the application comprises a pumping source, an optical fiber ring resonant cavity, a second optical fiber coupler, a second polarization controller, a third polarization controller and a polarization beam combiner; the optical fiber ring resonant cavity is formed by sequentially connecting a saturable absorber, a first polarization controller, a first optical fiber coupler, an optical isolator, a wavelength division multiplexer and an erbium-doped optical fiber and is used for outputting scalar solitons; the pumping source is connected with the wavelength division multiplexer; the second optical fiber coupler is respectively connected with the first optical fiber coupler, the second polarization controller and the third polarization controller; the second polarization controller and the third polarization controller are respectively connected with the polarization beam combiner through polarization-preserving single-mode fibers; the second optical fiber coupler, the second polarization controller, the third polarization controller and the polarization beam combiner are matched and used for converting the scalar soliton into a vector soliton; by converting the scalar solitons into the vector solitons outside the fiber ring resonator, superimposing the two scalar solitons into a vector, and without energy coupling and exchange, the vector solitons can be completely separated in two directions; in addition, the pulse intensity of the vector soliton can be adjusted through the second polarization controller and the third polarization controller.
Drawings
FIG. 1 is a schematic diagram of a vector soliton laser according to an embodiment of the application;
FIG. 2 is a spectral diagram of scalar solitons generated by a fiber ring resonator in accordance with an embodiment of the present application;
FIG. 3 is a pulse train of scalar solitons generated by a fiber ring resonator in accordance with an embodiment of the present application;
FIG. 4 is a spectral diagram of a spectral generation of scalar soliton polarization splitting in accordance with an embodiment of the present application;
FIG. 5 is a pulse train for generating scalar soliton polarization splitting in accordance with one embodiment of the present application;
FIG. 6 is a spectral diagram of vector solitons generated in an embodiment of the application;
FIG. 7 is a pulse sequence of vector solitons generated in an embodiment of the application;
FIG. 8 is a spectral diagram of vector soliton polarized light splitting produced in one embodiment of the application;
fig. 9 is a pulse train of vector soliton polarization splitting produced in one embodiment of the application.
The method comprises the following steps of 1, pumping sources; 2. a saturable absorber; 3. a first polarization controller; 4. a first optical fiber coupler; 5. an optical isolator; 6. a wavelength division multiplexer; 7. an erbium-doped optical fiber; 8. a second fiber coupler; 9. a second polarization controller; 10. a third polarization controller; 11. a polarization beam combiner; 12. a fourth polarization controller; 13. a polarizing beam splitter.
Detailed Description
The following detailed description of preferred embodiments of the application is made in connection with the accompanying drawings, which form a part hereof, and together with the description of the embodiments of the application, are used to explain the principles of the application and are not intended to limit the scope of the application.
Referring to fig. 1, an embodiment of the present application provides a vector soliton laser, including: the optical fiber polarization device comprises a pump source 1, an optical fiber ring resonant cavity, a second optical fiber coupler 8, a second polarization controller 9, a third polarization controller 10 and a polarization beam combiner 11;
the optical fiber ring resonant cavity is formed by sequentially connecting a saturable absorber 2, a first polarization controller 3, a first optical fiber coupler 4, an optical isolator 5, a wavelength division multiplexer 6 and an erbium-doped optical fiber 7 through a single-mode optical fiber and is used for outputting scalar solitons; the first polarization controller 3 is used for adjusting the polarization state of the laser pulse in the optical fiber ring resonator; the second port 6b of the wavelength division multiplexer 6 is connected with the erbium-doped fiber 7; a third port 6c of the wavelength division multiplexer 6 is connected with the optical isolator 5; the first port 4a of the first optical fiber coupler 4 is connected with the optical isolator 5, the third port 4c is connected with the first polarization controller 3, and the second port 4b is connected with the first port 8a of the second optical fiber coupler 8;
the pump source 1 is connected with the wavelength division multiplexer 6 through a single mode fiber; the pump source 1 is connected with a first port 6a of the wavelength division multiplexer 6;
the second optical fiber coupler 8 is respectively connected with the first optical fiber coupler 4, the second polarization controller 9 and the third polarization controller 10 through single-mode optical fibers; the second port 8b of the second optical fiber coupler 8 is connected with a third polarization controller 10, and the third port 8c is connected with a second polarization controller 9; the second polarization controller 9 and the third polarization controller 10 are respectively connected with the second port 11b and the first port 11a of the polarization beam combiner 11 through polarization-preserving single-mode fibers; the second optical fiber coupler 8, the second polarization controller 9, the third polarization controller 10 and the polarization beam combiner 11 cooperate to convert the scalar soliton into a vector soliton.
Illustratively, in this embodiment, the pump source 1 is a single-mode fiber coupled semiconductor laser; the power of the semiconductor laser is 80mW, and the wavelength is 980nm.
The material of the saturable absorber 2 is carbon nano tube, and has polarization insensitivity and high damage threshold.
The splitting ratio of the second fiber coupler 8 is 50:50.
The model of the erbium-doped fiber 7 is Nufern ESF-7/125, and the length is 1m; the erbium-doped fiber 7 is used to convert 980nm laser pulses into 1550nm laser pulses.
The split ratio of the first optical fiber coupler 4 is 10:90; the first port of the first optical fiber coupler 4 outputs 90% power laser pulse to the erbium-doped optical fiber 7; the second port of the first fiber coupler 4 outputs a laser pulse of 10% power to the first port 8a of the second fiber coupler 8.
The optical isolator 5 employs a polarization dependent isolator having a center wavelength of 1550nm.
The wavelength division multiplexer 6 operates at 980/1550nm.
Referring to fig. 1, in order to collect the spectrum of the vector soliton output by the vector soliton laser conveniently, the vector soliton laser further includes a fourth polarization controller 12 and a polarization beam splitter 13; the polarization beam splitter 13 is connected with the polarization beam combiner 11 through a fourth polarization controller 12; the third port 13c of the polarization beam splitter 13 is connected with the fourth polarization controller 12 through a single mode fiber; the fourth polarization controller 12 is connected with the third port 11c of the polarization beam combiner 11 through a single mode fiber; the polarizing beam splitter 13 is used to split the incident light into two polarized light beams with orthogonal polarization states.
The working principle of the vector soliton laser in this embodiment is as follows:
the polarization state of the laser pulse in the optical fiber ring resonant cavity is regulated by the first polarization controller 3 until a hyperbolic secant spectrum is generated by a spectrometer connected with the second port 4b of the first optical fiber coupler 4, so that mode locking is realized, and a scalar soliton is output to the second optical fiber coupler 8; the polarization states of the two paths of scalar solitons are regulated through the second polarization controller 9 and the third polarization controller 10, so that the polarization states of the two paths of laser pulses are orthogonal, and the vector solitons are output through the polarization beam combiner 11, the fourth polarization controller 12 and the polarization beam splitter 13 in sequence.
In the embodiment, by synthesizing the vector soliton outside the optical fiber ring resonator and superposing the vector soliton by two scalar quantities, no energy coupling and exchange exists, and the vector soliton can be completely separated in two directions; the pulse intensity of the vector soliton laser pulse can be adjusted by the second polarization controller 9 and the third polarization controller 10.
The above is not relevant and is applicable to the prior art.
In this document, terms such as front, rear, upper, lower, etc. are defined with respect to the positions of the components in the drawings and with respect to each other, for clarity and convenience in expressing the technical solution. It should be understood that the use of such orientation terms should not limit the scope of the claimed application.
The embodiments described above and features of the embodiments herein may be combined with each other without conflict.
The foregoing description of the preferred embodiments of the application is not intended to limit the application to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the application are intended to be included within the scope of the application.
Claims (10)
1. A vector soliton laser comprising: the device comprises a pumping source, an optical fiber ring resonator, a second optical fiber coupler, a second polarization controller, a third polarization controller and a polarization beam combiner;
the optical fiber ring resonant cavity is formed by sequentially connecting a saturable absorber, a first polarization controller, a first optical fiber coupler, an optical isolator, a wavelength division multiplexer and an erbium-doped optical fiber and is used for outputting scalar solitons;
the pumping source is connected with the wavelength division multiplexer;
the second optical fiber coupler is respectively connected with the first optical fiber coupler, the second polarization controller and the third polarization controller; the second polarization controller and the third polarization controller are respectively connected with the polarization beam combiner through polarization-preserving single-mode fibers; the second optical fiber coupler, the second polarization controller, the third polarization controller and the polarization beam combiner are matched and used for converting the scalar soliton into a vector soliton.
2. The vector soliton laser of claim 1, wherein the pump source is a single mode fiber coupled semiconductor laser.
3. The vector soliton laser of claim 2, wherein the semiconductor laser has a power of 80mW and a wavelength of 980nm.
4. The vector soliton laser of claim 1, wherein said saturable absorber is comprised of carbon nanotubes.
5. The vector soliton laser of claim 1, wherein said second fiber coupler has a 50:50 split ratio.
6. The vector soliton laser of claim 1, wherein said erbium doped fiber is Nufern ESF-7/125 and has a length of 1m.
7. The vector soliton laser of claim 1, wherein the first fiber coupler has a split ratio of 10:90.
8. The vector soliton laser of claim 1, wherein said optical isolator employs a polarization dependent isolator having a center wavelength of 1550nm.
9. The vector soliton laser of claim 1, wherein the wavelength division multiplexer operates at a wavelength of 980/1550nm.
10. The vector soliton laser of claim 1, further comprising a fourth polarization controller and a polarizing beam splitter; the polarization beam splitter is connected with the polarization beam combiner through the fourth polarization controller.
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| CN202111590354.2A CN114268008B (en) | 2021-12-23 | 2021-12-23 | Vector soliton laser |
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| CN202111590354.2A CN114268008B (en) | 2021-12-23 | 2021-12-23 | Vector soliton laser |
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| CN114268008B true CN114268008B (en) | 2023-10-17 |
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