CN216312317U - Dissipative soliton resonance pulse all-fiber mode-locked laser with single-mode and multi-mode symbiosis - Google Patents
Dissipative soliton resonance pulse all-fiber mode-locked laser with single-mode and multi-mode symbiosis Download PDFInfo
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Abstract
The utility model discloses a single-mode multi-mode symbiotic dissipative soliton resonance pulse all-fiber mode-locked laser, which comprises a pumping source and a fiber ring cavity formed by connecting a wavelength division multiplexer, an ytterbium-doped fiber, a fiber isolator, a first fiber coupler, a first polarization controller and a fiber nonlinear ring reflector; the optical fiber nonlinear annular reflector comprises a four-port optical fiber coupler, and two output ports of the four-port optical fiber coupler are connected with a second optical fiber coupler, a second polarization controller and a single-mode optical fiber which is single-mode at a 1 mu m wave band. According to the utility model, a conventional single-mode fiber device works in a multi-mode wave band, and a single-mode dissipative soliton resonance pulse and a multi-mode dissipative soliton resonance pulse are generated and output in the fiber laser.
Description
Technical Field
The utility model relates to the technical field of optical engineering, ultrafast nonlinear optical fiber optical dynamics and optical fiber lasers, in particular to a single-mode and multi-mode symbiotic dissipative soliton resonance pulse all-fiber mode-locked laser.
Background
The dissipative soliton resonance is a special area for the working of the optical fiber laser, and along with the increase of gain, the pulse width is increased while the pulse peak power is limited, and the pulse energy can be infinitely increased theoretically. The dissipative soliton resonance type pulse has a flat-topped time domain structure and limited peak power, and its spectrum has sharp spectral edges. As the pulse energy increases, the pulse width increases and the rectangular base of the spectrum does not change, with the newly emerging spectral components in the middle of the spectrum and forming a spike. In 2008, Chang et al theoretically discovered and proposed an operation mechanism of dissipative soliton resonance by solving a complex cubic quintic Kintzburg-Landau equation, and predicted the existence of dissipative soliton resonance pulses [1 ]. In 2009 Wu et al demonstrated the presence of dissipative soliton resonance pulses using nonlinear polarization rotating mode locking in erbium doped fiber lasers [2 ]. Along with the increase of the pumping power, the generated dissipative soliton resonance pulse keeps the peak power unchanged, and the pulse width is increased. Limited by the maximum pump power, the maximum pulse energy of the generated dissipative soliton resonance pulse is 281nJ, and the pulse energy and pulse width increase substantially linearly with the pump power.
Since its introduction, a great deal of research on dissipative soliton resonance pulses has been ongoing due to the superiority of dissipative soliton resonance in achieving large pulse energies and pulse tunability. 2011 university of Bierkente
By means of mode locking with nonlinear fiber ring mirror, rectangular pulse with repetition frequency of 3.1MHz and pulse width of 1ns is obtained in all-fiber structure and amplified to 83W 3 via gain fiber]. In 2013, Yang et al at Shenzhen university improve the energy of the dissipative soliton resonance pulse to 379.2nJ [4 ] in the erbium-doped fiber laser in the 8-shaped cavity normal dispersion region based on the nonlinear amplification fiber ring mirror mode locking technology]. In 2013, Liu et al at university of south China obtained dissipative soliton resonance pulse in ytterbium-doped single-mode fiber laser for the first timeThe highest single pulse energy is 3.24nJ, the adjustable range of pulse width is from 8.8ps to 22.92ps 5]. In 2014, Li et al, university in Hebei, obtained the dissipative soliton resonance pulse output of the ytterbium-doped fiber laser in the normal dispersion region by using nonlinear polarization rotation mode locking, the pulse width was adjusted from 54ns to 91ns, and the corresponding highest single pulse energy was 54.6nJ [6 ] 6]. In the same year, Cai et al of the university of defense science and technology propose an ytterbium-doped mode-locked fiber laser which can generate dissipative soliton resonance pulses with kilowatt-level peak power, and the dissipative soliton resonance pulses with 1.1kW peak power, 1.66W average power and 160nJ energy are realized by reducing the loop length of a nonlinear fiber loop mirror, and the pulse width can be adjusted from 48ps to 146ps [7 ] under the repetition frequency of 10.29MHz]. Dissipative soliton resonance pulses can also be formed in fiber lasers operating in the anomalous dispersion region.
The large-step promotion of pulse energy can be realized by dissipating soliton resonance, and the micro-focus level is reached. Ultrashort pulses with dissipative soliton resonance can theoretically have infinite pulse energy. Therefore, the fiber mode-locked laser capable of realizing dissipative soliton resonance pulse output has great application and research values.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a single-mode and multi-mode symbiotic dissipative soliton resonance pulse all-fiber mode-locked laser, which is based on a nonlinear fiber ring mirror mode-locking technology and aims to simultaneously generate single-mode dissipative soliton resonance pulses and multi-mode dissipative soliton resonance pulses in a fiber laser by utilizing the correlation between the mode of a single-mode fiber coupler and the working wavelength.
The utility model adopts the following technical scheme for realizing the purposes of the utility model:
the utility model provides a single-mode multi-mode symbiotic dissipative soliton resonance pulse all-fiber mode-locked laser, which comprises a pumping source and a fiber ring cavity formed by connecting a wavelength division multiplexer, an ytterbium-doped fiber, a fiber isolator, a first fiber coupler, a first polarization controller and a fiber nonlinear ring reflector;
the optical fiber nonlinear annular reflector comprises a four-port optical fiber coupler, and two output ports of the four-port optical fiber coupler are connected with a second optical fiber coupler, a second polarization controller and a single-mode optical fiber which is single-mode at a 1 mu m wave band;
the pumping source is connected with a pumping port of the wavelength division multiplexer, and a common port of the wavelength division multiplexer is connected to an energy input port of the first optical fiber coupler through an ytterbium-doped optical fiber and an optical fiber isolator in sequence;
the energy output port with the output proportion higher than 50% of the first optical fiber coupler is connected to the input port of the four-port optical fiber coupler through the polarization controller;
the reflection ports of the four-port optical fiber coupler are connected to the signal port of the wavelength division multiplexer;
the optical fiber nonlinear annular reflector is connected with the pumping source, the wavelength division multiplexer, the ytterbium-doped optical fiber, the optical fiber isolator, the first optical fiber coupler and the first polarization controller through a single-mode optical fiber which is single-mode in a 1 mu m wave band,
the four-port optical fiber coupler, the single-mode optical fiber which is single-mode at the 1 mu m waveband, the second polarization controller and the second optical fiber coupler are connected by using the single-mode optical fiber which is multi-mode at the 1 mu m waveband and is single-mode at the 1.55 mu m waveband;
the laser stable single-mode dissipative soliton resonance pulse is output from the energy output port with the output proportion of the first fiber coupler being lower than 50%, and the laser stable multi-mode dissipative soliton resonance pulse is output from the energy output port with the output proportion of the second fiber coupler being lower than 20%.
Furthermore, the pumping source is a semiconductor laser coupled by a single-mode fiber, the center wavelength of the semiconductor laser is 976nm, and the output tail fiber of the semiconductor laser is the single-mode fiber which is single-mode at a 1 μm waveband.
Furthermore, the working wavelength of the wavelength division multiplexer is 980/1064nm, and the output tail fiber of the wavelength division multiplexer is a single-mode optical fiber which is single-mode in a 1 μm wave band.
Further, the first optical fiber coupler adopts an optical fiber coupler with output energy lower than 50%, and the output tail fiber of the first optical fiber coupler is a single-mode optical fiber which is single-mode in a 1 μm waveband.
Furthermore, the optical fiber isolator adopts an isolator with the central wavelength of 1064nm, and the output tail fiber of the optical fiber isolator is a single-mode optical fiber which is single-mode in the wave band of 1 μm.
Further, the first polarization controller is a three-coil rotary polarization controller or an extrusion polarization controller, and the output pigtail of the first polarization controller is a single-mode fiber which is single-mode at a 1 μm waveband.
Furthermore, the four-port optical fiber coupler adopts an optical fiber coupler with the energy ratio of 20:80, and the output tail fiber of the four-port optical fiber coupler is multimode in a 1 mu m wave band and is single-mode in a 1.55 mu m wave band.
Further, the second polarization controller is a three-piece coil rotary polarization controller or an extrusion type polarization controller, and the output pigtail of the second polarization controller is multimode at a 1 μm waveband and is single-mode at a 1.55 μm waveband.
Furthermore, the second optical fiber coupler adopts an optical fiber coupler with the output energy ratio less than 20%, and the output tail fiber of the second optical fiber coupler is multimode in a 1 μm waveband and is single-mode in a 1.55 μm waveband.
The utility model has the following beneficial effects:
the method comprises the steps that a conventional single-mode fiber device works in a multi-mode wave band, and single-mode dissipative soliton resonance pulse and multi-mode dissipative soliton resonance pulse output are generated in a fiber laser at the same time;
a device which is single-mode at the 1.55 mu m wave band is used at the 1 mu m wave band, so that the device works in a multi-mode state, the requirement on a high-price multi-mode optical fiber device is avoided, and simultaneously, the design of a laser is utilized to meet the coexistence of multi-mode and single-mode, so that single-mode dissipative soliton resonance pulse and multi-mode dissipative soliton resonance pulse can be respectively output at different working positions of the laser. Compared with single-mode dissipative soliton resonant pulse, the multi-mode dissipative soliton resonant pulse can contain more pulse energy, and the method lays a foundation for further improving output pulse energy.
Drawings
Fig. 1 is a diagram of an experimental apparatus for implementing a dissipative soliton resonance pulse all-fiber mode-locked laser for single-mode and multi-mode symbiosis according to an embodiment of the present invention;
FIG. 2a is a time domain diagram of a single-mode dissipative soliton resonant pulse output from a numerically simulated laser according to an embodiment of the present invention;
FIG. 2b is a single mode dissipative soliton resonance pulse spectrum of a numerically simulated laser output according to an embodiment of the present invention;
FIG. 3a is a time domain diagram of a multi-mode dissipative soliton resonant pulse output from a numerically simulated laser according to an embodiment of the present invention;
fig. 3b is a spectrum diagram of a multimode dissipative soliton resonant pulse output from a numerically simulated laser according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the utility model provides a dissipative soliton resonance pulse all-fiber mode-locked laser for realizing single-mode and multi-mode symbiosis, which comprises a pumping source 1 and a fiber ring cavity formed by connecting a wavelength division multiplexer 2, an ytterbium-doped fiber 3, a fiber isolator 4, a first fiber coupler 5, a first polarization controller 6 and a fiber nonlinear ring reflector; the fiber nonlinear ring reflector is formed by connecting two output ports (7c and 7d) of a four-port fiber coupler 7 through a section of single-mode fiber 8 which is single-mode in a 1 mu m wave band, a second polarization controller 9 and a second fiber coupler 10. The pump source 1 is connected with a pump port 2a of the wavelength division multiplexer 2, a common port 2c of the wavelength division multiplexer 2 is sequentially connected with an energy input port 5a of a first optical fiber coupler 5 through an ytterbium-doped optical fiber 3, an optical fiber isolator 4, a 70% energy output port 5c of the first optical fiber coupler 5 is connected with an input port 7a of an optical fiber nonlinear annular reflector through a first polarization controller 6, and a reflection port 7b of the optical fiber nonlinear annular reflector is connected with a signal port 2b of the wavelength division multiplexer 2; the fiber nonlinear ring mirror is connected with the pump source 1, the wavelength division multiplexer 2, the ytterbium-doped fiber 3, the fiber isolator 4, the first fiber coupler 5 and the first polarization controller 6 by using a single-mode fiber which is single-mode in a 1 μm waveband, the four-port fiber coupler 7, the single-mode fiber 8 which is single-mode in the 1 μm waveband, the second polarization controller 9 and the second fiber coupler 10 in the fiber nonlinear ring mirror are connected by using a single-mode fiber which is multi-mode in the 1 μm waveband and is single-mode in a 1.55 μm waveband, a stable single-mode dissipative soliton resonance pulse of the laser is output from a 30% energy output port 5b of the first fiber coupler 5, and a stable multi-mode dissipative soliton resonance pulse is output from a 10% energy output port of the second fiber coupler 10.
The pumping source 1 is a semiconductor laser coupled by single-mode optical fibers, the central wavelength of the semiconductor laser is 976nm, the semiconductor laser corresponds to a pumping absorption peak of ytterbium-doped optical fibers, the pumping efficiency is improved, and the type of output tail fibers is the single-mode optical fibers which are single-mode at a wave band of 1 mu m.
Preferably, the output pigtail of the pump source 1 is Corning HI 1060.
The wavelength division multiplexer 2 has an operating wavelength of 980/1064nm, and is used for coupling pump light into the resonant cavity, and the tail fiber type is a single-mode fiber which is single-mode at 1 μm wave band.
Preferably, the pigtail type is Corning HI 1060.
The ytterbium-doped optical fiber 3 is YB406 in model and 40cm in length, is purchased from Coractive company, has high doping concentration, has the highest pumping absorption of 600dB/m, and has very strong gain.
The gain fiber is preferably YB406, and other single-mode ytterbium-doped fibers can be selected.
The optical fiber isolator 4 adopts an isolator with the central wavelength of 1064nm, and has the function of limiting the unidirectional operation of the laser, and the tail fiber type is a single-mode optical fiber which is single-mode at the wave band of 1 mu m.
Preferably, the pigtail type is Corning HI 1060.
The first optical fiber coupler 5 adopts an optical fiber coupler with an energy ratio of 30:70, and is used for outputting a single-mode dissipative soliton resonance pulse generated in a cavity, and the tail fiber type of the first optical fiber coupler is a single-mode optical fiber which is single-mode in a 1 mu m wave band.
Preferably, the pigtail type is Corning HI 1060.
The first polarization controller 6 is a three-coil rotary polarization controller or an extrusion polarization controller, and is used for adjusting the polarization and loss of the light pulse in the resonant cavity, and the tail fiber type of the first polarization controller is a single-mode fiber which is single-mode at a 1 mu m wave band.
Preferably, the pigtail type is Corning HI 1060.
The four-port optical fiber coupler 7 adopts an optical fiber coupler with the energy ratio of 20:80, has the function of connecting two output ports thereof with each other to form a nonlinear annular reflector as a mode locking starting device, and the tail fiber type of the four-port optical fiber coupler meets 1 mu m waveband multimode and 1.55 mu m waveband single mode.
Preferably, the pigtail type is Corning SMF-28 e.
The length of the single-mode optical fiber 8 which is single-mode at the 1 mu m wave band exceeds 300m and meets the single-mode at the 1 mu m wave band.
Preferably, the pigtail type is Corning HI 1060.
The second polarization controller 9 is a three-coil rotary polarization controller or an extrusion polarization controller, and is added into the annular reflector to adjust the polarization and loss of the light pulse. The type of the tail fiber meets 1 mu m wave band multi-mode and 1.55 mu m wave band single-mode.
Preferably, the pigtail type is Corning SMF-28 e.
The second optical fiber coupler 10 adopts an optical fiber coupler with the energy ratio of 10:90, and has the function of outputting multi-mode dissipative soliton resonance pulses generated in the cavity. The type of the tail fiber meets 1 mu m wave band multi-mode and 1.55 mu m wave band single-mode.
Preferably, the pigtail type is Corning SMF-28 e.
In fig. 1, reference numeral 2a denotes an input port of the present invention, reference numeral 5b denotes a single-mode dissipative soliton resonance pulse output port of the present invention, and a multi-mode dissipative soliton resonance pulse of the present invention is output from the second fiber coupler 10.
The length of the single-mode optical fiber 8 constituting the nonlinear annular reflector in the laser of the present invention is 300m or more. The key point of the laser for realizing the dissipative soliton resonance pulse is that a long nonlinear annular reflector is adopted to introduce the peak power clamping effect on the pulse; a single-mode fiber 8 of a 1 mu m wave band single mode is adopted to ensure that most of the interior of the nonlinear annular mirror operates in a single mode; the generation and output of multi-mode dissipative soliton resonance pulses are ensured by adopting a four-port optical fiber coupler 7 with 1 mu m waveband multi-mode and 1.55 mu m waveband single-mode, a second polarization controller 9 and a second optical fiber coupler 10.
The time domain graph and the spectral graph of the single-mode dissipative soliton resonance pulse output by the laser obtained by numerical simulation are respectively shown in fig. 2a and 2b, and the time domain graph and the spectral graph of the multi-mode dissipative soliton resonance pulse are respectively shown in fig. 3a and 3 b. The spectrum of the multi-mode dissipative soliton resonant pulse is more complex than that of the single-mode dissipative soliton resonant pulse, and is mainly reflected on a main peak structure.
The utility model provides a method for generating a single-mode and multi-mode symbiotic dissipative soliton resonance pulse, which comprises the following specific steps of: pumping continuous light is coupled into the fiber laser through a wavelength division multiplexer; the ytterbium-doped fiber absorbs the pumping continuous light and is excited to radiate a gain pulse in a long wave band; the gain pulse oscillates in the fiber laser cavity; the optical isolator enables pulses in the optical fiber laser to operate in a single direction; the gain pulse is input into the nonlinear annular mirror, and the pulses transmitted clockwise and anticlockwise are intersected in the nonlinear annular mirror and output through interference at the output end; the difference in the accumulation of nonlinear phase shifts with respect to the propagation direction leads to the generation of mode-locked pulses; although the output of the nonlinear annular mirror is in a multimode mode, the output of the single-mode dissipative soliton resonance pulse is only transmitted in the main cavity in the single-mode through mode filtering of the single-mode optical fiber in the main cavity, and the single-mode dissipative soliton resonance pulse is input into the nonlinear annular mirror in the single-mode to complete circulation; the working mode of the input end optical fiber of the nonlinear annular mirror is multimode, pulses are converted from a single mode into multimode when entering the nonlinear annular cavity, a) the single mode is recovered when the pulses pass through the single mode optical fiber 8 in the counterclockwise direction, the single mode is converted into multimode when the pulses pass through the second polarization controller 9 and the second optical fiber coupler 10, the multimode dissipative soliton resonance pulses are output, and the pulses finally enter the output end of the nonlinear annular mirror; b) the laser beam passes through a second optical fiber coupler 10 and a second polarization controller 9 in a clockwise direction to be in a multimode mode, is filtered by a single-mode optical fiber 8 mode to recover the single-mode, is converted into the multimode mode by a four-port optical fiber coupler 7, finally enters the output end of the nonlinear annular mirror, and completes interference output with multimode laser pulses entering anticlockwise; by using a long single-mode optical fiber 8, single-mode multimode dissipative soliton resonance pulses can be stably generated and output at different parts of the laser.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (9)
1. A dissipation soliton resonance pulse all-fiber mode-locked laser with single-mode and multi-mode symbiosis is characterized by comprising a pumping source and a fiber ring cavity formed by connecting a wavelength division multiplexer, an ytterbium-doped fiber, a fiber isolator, a first fiber coupler, a first polarization controller and a fiber nonlinear ring reflector;
the optical fiber nonlinear annular reflector comprises a four-port optical fiber coupler, and two output ports of the four-port optical fiber coupler are connected with a second optical fiber coupler, a second polarization controller and a single-mode optical fiber which is single-mode at a 1 mu m wave band;
the pumping source is connected with a pumping port of the wavelength division multiplexer, and a common port of the wavelength division multiplexer is connected to an energy input port of the first optical fiber coupler through an ytterbium-doped optical fiber and an optical fiber isolator in sequence;
the energy output port with the output proportion higher than 50% of the first optical fiber coupler is connected to the input port of the four-port optical fiber coupler through the polarization controller;
the reflection ports of the four-port optical fiber coupler are connected to the signal port of the wavelength division multiplexer;
the optical fiber nonlinear annular reflector is connected with the pumping source, the wavelength division multiplexer, the ytterbium-doped optical fiber, the optical fiber isolator, the first optical fiber coupler and the first polarization controller through a single-mode optical fiber which is single-mode in a 1 mu m wave band,
the four-port optical fiber coupler, the single-mode optical fiber which is single-mode at the 1 mu m waveband, the second polarization controller and the second optical fiber coupler are connected by using the single-mode optical fiber which is multi-mode at the 1 mu m waveband and is single-mode at the 1.55 mu m waveband;
the laser stable single-mode dissipative soliton resonance pulse is output from the energy output port with the output proportion of the first fiber coupler being lower than 50%, and the laser stable multi-mode dissipative soliton resonance pulse is output from the energy output port with the output proportion of the second fiber coupler being lower than 20%.
2. The single-mode multi-mode symbiotic dissipative soliton resonance pulse all-fiber mode-locked laser as claimed in claim 1, wherein said pump source is a single-mode fiber-coupled semiconductor laser with a center wavelength of 976nm and an output pigtail is a single-mode fiber that is single-mode at 1 μm band.
3. The dissipative soliton resonance pulse all-fiber mode-locked laser device according to claim 1, wherein the wavelength division multiplexer has an operating wavelength of 980/1064nm, and an output pigtail is a single-mode fiber that is single-mode at 1 μm.
4. The dissipative soliton resonance pulse all-fiber mode-locked laser device according to claim 1, wherein the first fiber coupler is a fiber coupler with output energy lower than 50%, and the output pigtail is a single-mode fiber that is single-mode in 1 μm band.
5. The single-mode multi-mode symbiotic dissipative soliton resonance pulse all-fiber mode-locked laser as claimed in claim 1, wherein said fiber isolator is an isolator with a center wavelength of 1064nm, and the output pigtail is a single-mode fiber which is single-mode at 1 μm band.
6. The single-mode multi-mode symbiotic dissipative soliton resonance pulse all-fiber mode-locked laser device according to claim 1, wherein the first polarization controller is a three-coil rotary polarization controller or a squeeze polarization controller, and the output pigtail is a single-mode fiber that is single-mode at 1 μm band.
7. The dissipative soliton resonance pulse all-fiber mode-locked laser device according to claim 1, wherein the four-port fiber coupler is a 20:80 fiber coupler, and the output pigtail is multimode at 1 μm band and single-mode at 1.55 μm band.
8. The single-mode multi-mode symbiotic dissipative soliton resonance pulse all-fiber mode-locked laser as claimed in claim 1, wherein said second polarization controller is a three-plate coil rotary polarization controller or a squeeze polarization controller, and its output pigtail is multi-mode at 1 μm band and single-mode at 1.55 μm band.
9. The single-mode multi-mode symbiotic dissipative soliton resonance pulse all-fiber mode-locked laser as claimed in claim 1, wherein said second fiber coupler is a fiber coupler with an output energy ratio of less than 20%, and the output pigtail is multi-mode at 1 μm band and single-mode at 1.55 μm band.
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