CN103208725B - Two-way reciprocal single longitudinal mode fiber ring cavity laser - Google Patents
Two-way reciprocal single longitudinal mode fiber ring cavity laser Download PDFInfo
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Abstract
The invention discloses a two-way reciprocal single longitudinal mode fiber ring cavity laser. The two-way reciprocal single longitudinal mode fiber ring cavity laser comprises a rare-earth-doped fiber (101) which is subjected to torsion processing, a first polarization controller (102), a first polarization converter (103), a narrow-band filter (104), an output coupler (105), a two-way line polarizer (110), a fine filter (112), a wavelength division multiplexer (113), a second polarization converter (114), a second polarization controller (115), a pump laser (111), a first isolator (106), a second isolator (109), a third polarization controller (107) and a fourth polarization controller (108). The two-way reciprocal single longitudinal mode fiber ring cavity laser can effectively eliminate the spatial hole-burning effect, reduce the usage of circularly-polarized light, reduce the systematic research and development risk, and reduce the influence of polarization state disturbance caused by environmental changes on the system stability, thereby improving the performance of the two-way reciprocal single longitudinal mode fiber ring cavity laser.
Description
Technical field
The present invention relates to technical field of optical fiber communication, particularly relate to a kind of two-way reciprocity single-longitudinal mode optical fiber ring cavity laser.
Background technology
At present, in technical field of optical fiber communication, doped fiber ring laser has with low cost, the advantage such as compact conformation, electromagnetism interference, has a wide range of applications at Fibre Optical Sensor, remote sensing and fiber optic communication field.When the two-beam transmitted in opposite directions in gain fibre forms standing wave, effects of spatial can occur, this effect can form gain grating in gain fibre, causes the two-beam propagated in opposite directions to be coupled, and then causes the effects such as many longitudinal modes, mode competition.So, to obtain two-way single longitudinal mode laser, then must suppress effects of spatial.
In prior art, linear polarization two-way single-longitudinal mode erbium doping optical fibre annular cavity laser and the two-way single-longitudinal mode erbium doping optical fibre annular cavity laser of circular polarization are achieved respectively.For the two-way single-longitudinal mode erbium doping optical fibre annular cavity laser of linear polarization, mutually orthogonal linearly polarized light is produced owing to using nonreciprocal device, the light path of passing by along upper two the orhtogonal linear polarizaiton light of counter clockwise direction is different, therefore laser is different along the eigenfrequency in counterclockwise both direction, there is frequency offset, when external environment changes, (as variations in temperature) can cause frequency offset fluctuation like this, and then affects frequency stability and the range of application of laser.
And for the two-way single-longitudinal mode erbium doping optical fibre annular cavity laser of circular polarization, general needs carry out torsion process to the tail optical fiber of all devices, inclined ability is protected to obtain certain circle, and the immature circular polarization state that result in light in annular chamber that optical fiber circle protects inclined technology and device can not well keep, be subject to the impact of the environmental factors such as vibrations, temperature, and then the stability of influential system.
Summary of the invention
The object of this invention is to provide a kind of two-way reciprocity single-longitudinal mode optical fiber ring cavity laser, effectively can suppress effects of spatial, reduce the use of circularly polarized light, reduce system research and development risk, and reduce polarization state disturbance that environmental change causes to the impact of the stability of a system, improve the performance of doped fiber ring laser.
The object of the invention is to be achieved through the following technical solutions:
A kind of two-way reciprocity single-longitudinal mode optical fiber ring cavity laser, described doped fiber ring laser comprises through reversing the rare-earth doped optical fibre (101) processed, first Polarization Controller (102), first polarization converter (103), narrow band filter (104), output coupler (105), the bidirectional lines polarizer (110), finer filter device (112), wavelength division multiplexer (113), second polarization converter (114), second Polarization Controller (115), pump laser (111), first isolator (106), second isolator (109), 3rd Polarization Controller (107) and the 4th Polarization Controller (108), wherein:
What transmit in opposite directions in described rare-earth doped optical fibre (101) is two bundle same frequencys, circularly polarized light with polarization state, part beyond described rare-earth doped optical fibre (101), what transmit in opposite directions is two bundle same frequencys, linearly polarized light with polarization state;
One end of described first Polarization Controller (102) is connected with one end of described rare-earth doped optical fibre (101), for the circular polarization state in the described rare-earth doped optical fibre of meticulous adjustment (101);
One end of described first polarization converter (103) is connected with the other end of described first Polarization Controller (102), for realizing the mutual conversion between linear polarization and circular polarization state;
One end of described narrow band filter (104) is connected with the other end of described first polarization converter (103), for realizing single peak narrowband filter function;
Described output coupler (105) comprises four ports, wherein two ports are as input, two other port is as output, and this output coupler (105) is connected with the other end of described narrow band filter (104) as a port of input;
One end of the described bidirectional lines polarizer (110) is connected with described output coupler (105) another port as input, rises partially for realizing bidirectional lines polarization state;
One end of described finer filter device (112) is connected with the other end of the described bidirectional lines polarizer (110), described narrow band filter (104) and described finer filter device (112) are as composite filter, for jointly realizing optical frequency pole narrow-band filtering, obtain single longitudinal mode laser;
One end of described wavelength division multiplexer (113) is connected, for pumping laser is coupled into optic fiber ring-shaped cavity with the other end of described finer filter device (112);
One end of described second polarization converter (114) is connected with the other end of described wavelength division multiplexer (113), for realizing the mutual conversion between linear polarization and circular polarization state;
One end of described second Polarization Controller (115) is connected with the other end of described second polarization converter (114), the other end of described second Polarization Controller (115) is connected with the other end of described rare-earth doped optical fibre (101), for the circular polarization state in the described rare-earth doped optical fibre of meticulous adjustment (101);
Described pump laser (111) is connected, for generation of pumping laser with the pumping input of described wavelength division multiplexer (113);
One end of described first isolator (106) is connected, for isolating the reverberation of this output outgoing with the port of described output coupler (105) as output;
One end of described second isolator (109) is connected with described output coupler (105) another port as output, for isolating the reverberation of this another output outgoing;
One end of described 3rd Polarization Controller (107) is connected with the other end of described first isolator (106), for regulating described first isolator (106) to export polarisation of light state, what the other end of the 3rd Polarization Controller (107) exported is clockwise laser;
One end of described 4th Polarization Controller (108) is connected with the other end of described second isolator (109), for regulating described second isolator (109) to export polarisation of light state, what the other end of the 4th Polarization Controller (107) exported is counterclockwise laser.
The annular chamber of described doped fiber ring laser is made up of reciprocal device, and the laser eigenfrequency along counterclockwise both direction is identical.
Described rare-earth doped optical fibre (101) is Er-doped fiber or erbium-ytterbium co-doped fiber, and uses line to protect the linear polarization of inclined device maintenance transmission light.
Described narrow band filter (104), output coupler (105), the bidirectional lines polarizer (110), finer filter device (112) and wavelength division multiplexer (113) are line and protect inclined device, and tail optical fiber is line polarization maintaining optical fibre.
The tail optical fiber that described first polarization converter (103) is connected with described rare-earth doped optical fibre (101) with described second polarization converter (114) is general single mode fiber, and carry out torsion process to it, and other end tail optical fiber is single mode line polarization maintaining optical fibre.
Described narrow band filter (104) is the unimodal filter of transmission-type, two-way reciprocity work.
Described finer filter device (112) is comb filter, be made up of the first three-dB coupler (201) and the second three-dB coupler (202), specifically comprise: optical fiber mach-Zeng Deer Mach-Zehnder comb filter, fiber annular cavity filter or optical fibre Fabry-perot Fabry-Perot cavity filter.
Described pump laser (111) adopts 980 nanometer nm pump laser diodes or 1480nm pump laser diode.
Described output coupler (105) is 90/10 coupler or 80/20 coupler.
As seen from the above technical solution provided by the invention, described doped fiber ring laser comprises through reversing the rare-earth doped optical fibre (101) processed, first Polarization Controller (102), first polarization converter (103), narrow band filter (104), output coupler (105), the bidirectional lines polarizer (110), finer filter device (112), wavelength division multiplexer (113), second polarization converter (114), second Polarization Controller (115), pump laser (111), first isolator (106), second isolator (109), 3rd Polarization Controller (107) and the 4th Polarization Controller (108).This doped fiber ring laser effectively can suppress effects of spatial, reduces the use of circularly polarized light, reduces system research and development risk, and reduces polarization state disturbance that environmental change causes to the impact of the stability of a system, improves the performance of doped fiber ring laser.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme of the embodiment of the present invention, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 provides by the embodiment of the present invention structural representation of two-way reciprocity single-longitudinal mode optical fiber ring cavity laser;
Fig. 2 is along the change curve schematic diagram of counterclockwise power output with pump power in embodiment of the present invention example;
Fig. 3 is the spectrum schematic diagram of clockwise output in embodiment of the present invention example;
Fig. 4 is the spectrum schematic diagram of counterclockwise output in embodiment of the present invention example;
Fig. 5 is used in embodiment of the present invention example verifying operating state and the apparatus structure sketch along counterclockwise laser frequency;
Fig. 6 is the time domain sweep waveform schematic diagram of clockwise output in embodiment of the present invention example;
Fig. 7 is the time domain sweep waveform schematic diagram of counterclockwise output in embodiment of the present invention example;
Fig. 8 first closes the time domain sweep waveform schematic diagram after bundle process by a three-dB coupler along exporting counterclockwise in embodiment of the present invention example.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on embodiments of the invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to protection scope of the present invention.
The linearly polarized light that the embodiment of the present invention provides and the scheme that circularly polarized light combines, the frequency offset fluctuation problem in original linear polarization system can be overcome, decrease the use of circularly polarized light, reduce system research and development risk, reduce circular polarization state disturbance that environmental change causes to the impact of systematic function, below in conjunction with accompanying drawing, the embodiment of the present invention is described in further detail, each parts of the present embodiment are shown in the drawings, wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish, and be exemplary below by the embodiment be described with reference to the drawings, only for explaining the present invention, and limitation of the present invention can not be interpreted as, be illustrated in figure 1 the embodiment of the present invention the structural representation of two-way reciprocity single-longitudinal mode optical fiber ring cavity laser is provided, doped fiber ring laser in Fig. 1 comprises through reversing the rare-earth doped optical fibre (101) processed, first Polarization Controller (102), first polarization converter (103), narrow band filter (104), output coupler (105), the bidirectional lines polarizer (110), finer filter device (112), wavelength division multiplexer (113), second polarization converter (114), second Polarization Controller (115), pump laser (111), first isolator (106), second isolator (109), 3rd Polarization Controller (107) and the 4th Polarization Controller (108), wherein:
What transmit in opposite directions in described rare-earth doped optical fibre (101) is two bundle same frequencys, circularly polarized light with polarization state, and this two-beam can not interfere, and then can overcome the effects of spatial in rare-earth doped optical fibre (101); Part beyond described rare-earth doped optical fibre (101), what transmit in opposite directions is two bundle same frequencys, linearly polarized light with polarization state, use line to protect inclined device and keep the linear polarization of transmission light, polarization state disturbance that environmental change causes can be reduced on the impact of the stability of a system.
In specific implementation process, described rare-earth doped optical fibre (101) can be Er-doped fiber or erbium-ytterbium co-doped fiber etc., and carries out torsion process, to reduce the impact of environmental change on the circularly polarized light polarization state wherein transmitted.Such as this rare-earth doped optical fibre (101) can be the Liekki Er30-4/125 Er-doped fiber of 50cm length, and has carried out reversing process, and torsion rate is every meter 70 circle.
One end of described first Polarization Controller (102) is connected with one end of described rare-earth doped optical fibre (101), for the circular polarization state in the described rare-earth doped optical fibre of meticulous adjustment (101).
One end of described first polarization converter (103) is connected with the other end of described first Polarization Controller (102), for realizing the mutual conversion between linear polarization and circular polarization state.
One end of described narrow band filter (104) is connected with the other end of described first polarization converter (103), for realizing single peak narrowband filter function, specifically: described narrow band filter (104) can be the unimodal filter of transmission-type, two-way reciprocity work, such as this narrow band filter (104) can adopt the unimodal filter of transmission-type, its centre wavelength is 1550nm, and halfwidth is 0.2nm.
Described output coupler (105) comprises four ports, wherein two ports are as input, two other port is as output, and this output coupler (105) is connected with the other end of described narrow band filter (104) as a port of input; In specific implementation, this output coupler (105) can be 90/10 coupler or 80/20 coupler, and such as this output coupler (105) can be 90/10 coupler, and wherein 10% port is as two outputs.
One end of the described bidirectional lines polarizer (110) is connected with described output coupler (105) another port as input, rises partially for realizing bidirectional lines polarization state.
One end of described finer filter device (112) is connected with the other end of the described bidirectional lines polarizer (110), described narrow band filter (104) and described finer filter device (112) are as composite filter, for jointly realizing optical frequency pole narrow-band filtering, obtain single longitudinal mode laser, in specific implementation: described finer filter device (112) can be comb filter, be made up of the first three-dB coupler (201) and the second three-dB coupler (202), such as can by optical fiber mach-Zeng Deer Mach-Zehnder comb filter, fiber annular cavity filter or optical fibre Fabry-perot Fabry-Perot cavity filter realize, specifically can form optical fiber Mach-Zehnder pectination finer filter device (112) by the first three-dB coupler (201) and the second three-dB coupler (202), its arm length difference is 20cm, its free spectrum width is about 1GHz, the three dB bandwidth of each passband is about 333MHz.
One end of described wavelength division multiplexer (113) is connected, for pumping laser is coupled into optic fiber ring-shaped cavity with the other end of described finer filter device (112).
One end of described second polarization converter (114) is connected with the other end of described wavelength division multiplexer (113), for realizing the mutual conversion between linear polarization and circular polarization state.
One end of described second Polarization Controller (115) is connected with the other end of described second polarization converter (114), the other end of described second Polarization Controller (115) is connected with the other end of described rare-earth doped optical fibre (101), for the circular polarization state in the described rare-earth doped optical fibre of meticulous adjustment (101).
Described pump laser (111) is connected, for generation of pumping laser with the pumping input of described wavelength division multiplexer (113); In specific implementation, this pump laser (111) can be 980nm pump laser diode or 1480nm pump laser diode, its pumping input is 980nm input or 1480nm input, such as, if described wavelength division multiplexer (113) is 980nm/1550nm wavelength division multiplexer, then pump laser (111) is 980nm pump laser diode.
One end of described first isolator (106) is connected, for isolating the reverberation of this output outgoing with the port of described output coupler (105) as output.
One end of described second isolator (109) is connected with described output coupler (105) another port as output, for isolating the reverberation of this another output outgoing.
One end of described 3rd Polarization Controller (107) is connected with the other end of described first isolator (106), for regulating described first isolator (106) to export polarisation of light state, what the other end of the 3rd Polarization Controller (107) exported is clockwise laser.
One end of described 4th Polarization Controller (108) is connected with the other end of described second isolator (109), for regulating described second isolator (109) to export polarisation of light state, what the other end of the 4th Polarization Controller (107) exported is counterclockwise laser.
In addition, the annular chamber of whole doped fiber ring laser is made up of reciprocal device, and the laser eigenfrequency along counterclockwise both direction is identical, thus overcomes frequency offset fluctuation problem.Here, described reciprocal device refers to when excitation port and echo port transposition, responds the characteristic do not changed to some extent because of this exchange.For Two-port netwerk device, show as left port identical to the transmission characteristic of left port with right output port to the transmission characteristic of right output port.
In addition, in specific implementation process:
Above-mentioned narrow band filter (104), output coupler (105), the bidirectional lines polarizer (110), finer filter device (112), wavelength division multiplexer (113) are line and protect inclined device, and tail optical fiber is line polarization maintaining optical fibre.
The tail optical fiber that above-mentioned first polarization converter (103) is connected with rare-earth doped optical fibre (101) with the second polarization converter (114) is general single mode fiber, and torsion process is carried out to it, other end tail optical fiber is single mode line polarization maintaining optical fibre, and all-fiber quarter wave plate or the online quarter wave plate of discrete device specifically can be adopted to realize.
With instantiation, the power output of above-mentioned two-way reciprocity single-longitudinal mode optical fiber ring cavity laser and performance are described below:
Be illustrated in figure 2 in embodiment of the present invention example along the change curve schematic diagram of counterclockwise power output with pump power, find from Fig. 2, pumping threshold along counterclockwise both direction is 7.3mW, because output is that backward pump exports clockwise, under identical pump power, the power output exported clockwise is larger than the power output exported counterclockwise.
When pump power is 33.1mW, careful adjustment first Polarization Controller (103) and the second Polarization Controller (115), can make along counterclockwise power output suitable, now record the spectrum along exporting counterclockwise, be illustrated in figure 3 the spectrum schematic diagram of clockwise output, in Fig. 3: laser center wavelength is 1549.927nm, 3dB spectrum width is 0.014nm, and peak power is-25.2dBm; Be illustrated in figure 4 the spectrum schematic diagram of counterclockwise output, in Fig. 4: laser center wavelength is 1549.922nm, 3dB spectrum width is 0.015nm, and peak power is-24.8dBm.
The operating state whether two-way reciprocity single-longitudinal mode optical fiber ring cavity laser provided the embodiment of the present invention further is below in two-way single longitudinal mode is verified, be illustrated in figure 5 for checking operating state and the apparatus structure sketch along counterclockwise laser frequency, the scanning annular chamber (301) in Fig. 5 is adopted to scan respectively suitable counterclockwise two outputs shown in Fig. 1, through scanning annular chamber (301) laser that exports by after photodetector (302), waveform is presented on oscilloscope (303), the free spectrum width of wherein said scanning annular chamber (301) is about 100MHz, sweep limits (half scan period) is about 230MHz.
In the present embodiment given example, the whole annular chamber chamber of this two-way reciprocity single-longitudinal mode optical fiber ring cavity laser is long is 4.4m, annular chamber longitudinal mode spacing is 45MHz, and whole system is made up of reciprocal device, consider that the chamber of whole laser annular chamber is grown for 4.4m like this, laser annular chamber longitudinal mode spacing is 45MHz, if system works is in single longitudinal mode state, then oscilloscope (303) upper every half scan period just should corresponding two absworption peaks, verify whether this doped fiber ring laser is in the operating state of two-way single longitudinal mode in this, as foundation.
As the time domain sweep waveform schematic diagram that Fig. 6 is clockwise output in embodiment of the present invention example, in Fig. 6: corresponding every half scan period, sweep waveform has two absworption peaks; As the time domain sweep waveform schematic diagram that Fig. 7 is counterclockwise output in embodiment of the present invention example, in Fig. 7: corresponding every half scan period, sweep waveform has two absworption peaks.So seen from the above description, the two-way reciprocity single-longitudinal mode optical fiber ring cavity laser that the embodiment of the present invention provides is operated in two-way single longitudinal mode state really.
Verify whether the suitable counterclockwise laser frequency of the two-way reciprocity single-longitudinal mode optical fiber ring cavity laser that the embodiment of the present invention provides is identical further more below, be illustrated in figure 8 and first close the time domain sweep waveform schematic diagram after bundle process by a three-dB coupler along exporting counterclockwise, the demo plant adopted still as shown in Figure 5, input signal just now in Fig. 5 is become clockwise output and counterclockwise output in Fig. 1 and is first closed by a three-dB coupler and restraint, signal again after photodetector, then adjustment the 3rd Polarization Controller (107) and the 4th Polarization Controller (108) just can obtain the time domain sweep waveform shown in Fig. 8.Can find corresponding every half scan period, sweep waveform has two absworption peaks from Fig. 8, this means that along counterclockwise laser frequency be identical.
In sum, the embodiment of the present invention effectively can suppress effects of spatial, reduce the use of circularly polarized light, reduce system research and development risk, and reduce polarization state disturbance that environmental change causes to the impact of the stability of a system, the frequency offset fluctuation problem in original linear polarization system can be overcome simultaneously, improve the performance of doped fiber ring laser.
The above; be only the present invention's preferably embodiment, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claims.
Claims (8)
1. a two-way reciprocity single-longitudinal mode optical fiber ring cavity laser, it is characterized in that, described doped fiber ring laser comprises through reversing the rare-earth doped optical fibre (101) processed, first Polarization Controller (102), first polarization converter (103), narrow band filter (104), output coupler (105), the bidirectional lines polarizer (110), finer filter device (112), wavelength division multiplexer (113), second polarization converter (114), second Polarization Controller (115), pump laser (111), first isolator (106), second isolator (109), 3rd Polarization Controller (107) and the 4th Polarization Controller (108), wherein:
What transmit in opposite directions in described rare-earth doped optical fibre (101) is two bundle same frequencys, circularly polarized light with polarization state, part beyond described rare-earth doped optical fibre (101), what transmit in opposite directions is two bundle same frequencys, linearly polarized light with polarization state;
One end of described first Polarization Controller (102) is connected with one end of described rare-earth doped optical fibre (101), for the circular polarization state in the described rare-earth doped optical fibre of meticulous adjustment (101);
One end of described first polarization converter (103) is connected with the other end of described first Polarization Controller (102), for realizing the mutual conversion between linear polarization and circular polarization state;
One end of described narrow band filter (104) is connected with the other end of described first polarization converter (103), for realizing single peak narrowband filter function;
Described output coupler (105) comprises four ports, wherein two ports are as input, two other port is as output, and this output coupler (105) is connected with the other end of described narrow band filter (104) as a port of input;
One end of the described bidirectional lines polarizer (110) is connected with described output coupler (105) another port as input, rises partially for realizing bidirectional lines polarization state;
One end of described finer filter device (112) is connected with the other end of the described bidirectional lines polarizer (110), described narrow band filter (104) and described finer filter device (112) are as composite filter, for jointly realizing optical frequency pole narrow-band filtering, obtain single longitudinal mode laser;
One end of described wavelength division multiplexer (113) is connected, for pumping laser is coupled into optic fiber ring-shaped cavity with the other end of described finer filter device (112);
One end of described second polarization converter (114) is connected with the other end of described wavelength division multiplexer (113), for realizing the mutual conversion between linear polarization and circular polarization state;
One end of described second Polarization Controller (115) is connected with the other end of described second polarization converter (114), the other end of described second Polarization Controller (115) is connected with the other end of described rare-earth doped optical fibre (101), for the circular polarization state in the described rare-earth doped optical fibre of meticulous adjustment (101);
Described pump laser (111) is connected, for generation of pumping laser with the pumping input of described wavelength division multiplexer (113);
One end of described first isolator (106) is connected, for isolating the reverberation of this output outgoing with the port of described output coupler (105) as output;
One end of described second isolator (109) is connected with described output coupler (105) another port as output, for isolating the reverberation of this another output outgoing;
One end of described 3rd Polarization Controller (107) is connected with the other end of described first isolator (106), for regulating described first isolator (106) to export polarisation of light state, what the other end of the 3rd Polarization Controller (107) exported is clockwise laser;
One end of described 4th Polarization Controller (108) is connected with the other end of described second isolator (109), for regulating described second isolator (109) to export polarisation of light state, what the other end of the 4th Polarization Controller (107) exported is counterclockwise laser.
2. two-way reciprocity single-longitudinal mode optical fiber ring cavity laser as claimed in claim 1, it is characterized in that, the annular chamber of described doped fiber ring laser is made up of reciprocal device, and the laser eigenfrequency along counterclockwise both direction is identical.
3. two-way reciprocity single-longitudinal mode optical fiber ring cavity laser as claimed in claim 1, it is characterized in that, described rare-earth doped optical fibre (101) is Er-doped fiber or erbium-ytterbium co-doped fiber, and uses line to protect the linear polarization of inclined device maintenance transmission light.
4. two-way reciprocity single-longitudinal mode optical fiber ring cavity laser as claimed in claim 1, it is characterized in that, described narrow band filter (104), output coupler (105), the bidirectional lines polarizer (110), finer filter device (112) and wavelength division multiplexer (113) are line and protect inclined device, and tail optical fiber is line polarization maintaining optical fibre.
5. two-way reciprocity single-longitudinal mode optical fiber ring cavity laser as claimed in claim 1, is characterized in that, described narrow band filter (104) is the unimodal filter of transmission-type, two-way reciprocity work.
6. two-way reciprocity single-longitudinal mode optical fiber ring cavity laser as claimed in claim 1, it is characterized in that, described finer filter device (112) is comb filter, be made up of the first three-dB coupler (201) and the second three-dB coupler (202), specifically comprise: optical fiber mach-Zeng Deer Mach-Zehnder comb filter, fiber annular cavity filter or optical fibre Fabry-perot Fabry-Perot cavity filter.
7. two-way reciprocity single-longitudinal mode optical fiber ring cavity laser as claimed in claim 1, it is characterized in that, described pump laser (111) adopts 980 nanometer nm pump laser diodes or 1480nm pump laser diode.
8. two-way reciprocity single-longitudinal mode optical fiber ring cavity laser as claimed in claim 1, is characterized in that, described output coupler (105) is 90/10 coupler or 80/20 coupler.
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| CN106207724A (en) * | 2016-08-31 | 2016-12-07 | 暨南大学 | A kind of tunable single-frequency optical fiber laser and its implementation |
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| CN110048303A (en) * | 2019-03-18 | 2019-07-23 | 深圳市速腾聚创科技有限公司 | A kind of laser and Optical Maser System |
| CN112202039B (en) * | 2020-09-15 | 2021-10-26 | 暨南大学 | Single-mode fiber ring laser, working method thereof and laser system |
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| US5420684A (en) * | 1989-12-22 | 1995-05-30 | The Charles Stark Draper Laboratory, Inc. | Resonant interferometer fiber optic gyroscope |
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| CN106207724A (en) * | 2016-08-31 | 2016-12-07 | 暨南大学 | A kind of tunable single-frequency optical fiber laser and its implementation |
| CN106207724B (en) * | 2016-08-31 | 2018-10-09 | 暨南大学 | A kind of tunable single-frequency optical fiber laser and its implementation |
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