CN210779482U - Tunable narrow linewidth optical fiber laser - Google Patents
Tunable narrow linewidth optical fiber laser Download PDFInfo
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- CN210779482U CN210779482U CN201922115561.7U CN201922115561U CN210779482U CN 210779482 U CN210779482 U CN 210779482U CN 201922115561 U CN201922115561 U CN 201922115561U CN 210779482 U CN210779482 U CN 210779482U
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Abstract
The utility model discloses a tunable narrow linewidth fiber laser, including pumping source, wavelength division multiplexer, erbium-doped fiber, tunable filter, isolator, coupler and single longitudinal mode filtering unit connect and constitute the travelling wave resonant cavity; the tail fiber of the pumping source is connected with the pumping end of the wavelength division multiplexer, the common end of the wavelength division multiplexer is connected with one end of the erbium-doped fiber, the other end of the erbium-doped fiber is connected with the input end of the tunable filter, the output end of the tunable filter is connected with the input end of the isolator, the output end of the isolator is connected with the input end of the coupler, the small end of the coupler is the output end of the tunable narrow-linewidth fiber laser, the large end of the coupler is connected with the input end of the single longitudinal mode filtering unit, and the output end of the single longitudinal mode filtering unit is connected with the signal end of the wavelength division multiplexer.
Description
Technical Field
The utility model relates to a fiber laser field especially relates to the narrow linewidth laser output that can realize 1520 ~ 1576nm within range wavelength tunable in succession, specifically is a tunable narrow linewidth fiber laser.
Background
The single-frequency fiber laser has the characteristics of good mode characteristics, no mode competition, stable output power and the like, and is a hotspot of research in the industry. Especially, the narrow-linewidth single-frequency optical fiber laser working at 1550nm band has important application not only in the field of high-speed optical fiber communication, but also in the fields of remote optical sensing, coherent communication, high-precision spectral analysis and the like.
Chinese patent publication No. CN109286122A discloses a multiband tunable single-frequency fiber laser, in which an AWG is added in a linear cavity, and switching between different wavebands is realized by adjusting the operating wavelength of the AWG. Chinese patent publication No. CN108183385A discloses a tunable narrow linewidth laser based on pi-phase shift fiber grating, which realizes output wavelength tuning by adjusting pi-phase shift grating and high reflection FBG grating respectively through two piezoelectric ceramics, and the method is complex in control and cannot realize fast tuning in a wide waveband range.
Therefore, it is desirable to provide a fiber laser that can easily achieve narrow linewidth continuously tunable laser output and is convenient for production.
Disclosure of Invention
The utility model aims at the problem that prior art exists, provide a tunable narrow linewidth fiber laser, easily realize the continuous tunable laser output of narrow linewidth, the mass production of being convenient for simultaneously.
In order to achieve the above object, the utility model adopts the following technical scheme:
the tunable narrow linewidth optical fiber laser comprises a pumping source, a wavelength division multiplexer, an erbium-doped optical fiber, a tunable filter, an isolator, a coupler and a single longitudinal mode filtering unit, wherein the wavelength division multiplexer, the erbium-doped optical fiber, the tunable filter, the isolator, the coupler and the single longitudinal mode filtering unit are connected to form a traveling wave resonant cavity; the tail fiber of the pumping source is connected with the pumping end of the wavelength division multiplexer, the common end of the wavelength division multiplexer is connected with one end of the erbium-doped fiber, the other end of the erbium-doped fiber is connected with the input end of the tunable filter, the output end of the tunable filter is connected with the input end of the isolator, the output end of the isolator is connected with the input end of the coupler, the small end of the coupler is the output end of the tunable narrow-linewidth fiber laser, the large end of the coupler is connected with the input end of the single longitudinal mode filtering unit, and the output end of the single longitudinal mode filtering unit is connected with the signal end of the wavelength division multiplexer.
The utility model discloses in, the pumping source gets into erbium-doped fiber through wavelength division multiplexer, produces the stimulated radiation oscillation at the travelling wave resonant cavity, exports narrow linewidth laser through tunable filter, isolator and coupler. The oscillating laser in the resonant cavity enters the unpumped erbium-doped fiber through the second port of the circulator and then is reflected by the reflector, the oscillating laser transmitted in two directions is in the unpumped erbium-doped fiber, the spatial periodic variation of the fiber core refractive index is caused by the interference effect to form a phase grating, the distribution of the phase grating depends on the laser oscillation wavelength and the absorption coefficient of the unpumped erbium-doped fiber, the single longitudinal mode filtering can be effectively carried out on the oscillating laser transmitted in the phase grating, and the multi-longitudinal mode output is restrained.
Preferably, the single longitudinal mode filtering unit comprises a circulator, an unpumped erbium-doped fiber and a reflector, wherein a first port of the circulator is connected with the large end of the coupler, a second port of the circulator is connected with one end of the unpumped erbium-doped fiber, the other end of the unpumped erbium-doped fiber is connected with the reflector, and a third port of the circulator is connected with the signal end of the wavelength division multiplexer.
Preferably, the single longitudinal mode filtering unit comprises an unpumped erbium doped fiber and 50/50 coupler, the unpumped erbium doped fiber and 50/50 coupler forming a Sagnac loop.
Preferably, the working voltage of the tunable filter is adjustable, and continuous tuning of the working wavelength within the waveband of 1520-1576 nm is realized by adjusting the working voltage of the tunable filter. The working voltage of the tunable filter can be adjusted by software control. The tunable filter is combined with unpumped erbium-doped fibers to realize tunable narrow linewidth laser output.
Preferably, the tunable filter is a tunable filter based on MEMS principle. The tunable filter is used for roughly selecting the laser oscillation wavelength.
Preferably, the isolator and circulator are unidirectional devices. The isolator and the circulator are arranged as unidirectional devices, so that the laser can be prevented from being transmitted in the resonant cavity in a bidirectional mode.
Preferably, the reflectivity of the mirror is 90%. This can improve the laser output power and the output laser side mode suppression ratio.
Preferably, all devices in the tunable narrow linewidth fiber laser are polarization maintaining devices, and all interconnected fibers adopt a fusion mode of slow axis alignment. Such an arrangement avoids polarization perturbations from causing lasing mode hopping.
Compared with the prior art, the beneficial effects of the utility model are that:
(1) the utility model discloses the pumping source passes through wavelength division multiplexer and gets into erbium-doped fiber, produces the stimulated radiation oscillation at the travelling wave resonant cavity, through tunable filter, isolator and coupler output narrow linewidth laser, through single vertical mode filtering unit realization single vertical mode filtering.
(2) The utility model has the advantages that a section of unpumped erbium-doped fiber is welded in the fiber link, the unpumped erbium-doped fiber is internally provided with the oscillating laser which is transmitted in two directions, the spatial periodic variation of the refractive index of the fiber core caused by the interference effect forms a phase grating, the distribution of the phase grating depends on the laser oscillation wavelength and the absorption coefficient of the unpumped erbium-doped fiber, the light transmitted in two directions interferes in the unpumped erbium-doped fiber, the insertion loss of the laser transmitted in opposite directions with the same frequency is minimum, two laser beams with different frequencies are transmitted in the unpumped erbium-doped fiber with larger insertion loss to inhibit the laser radiation, the phase grating effectively carries out single longitudinal mode filtering on laser oscillation transmitted in the phase grating, inhibits multi-longitudinal mode output, has two remarkable characteristics, namely narrower bandwidth, the mode hopping phenomenon and mode competition can be effectively inhibited, the resonant cavity laser oscillation is stabilized, and the working wavelength of the resonant cavity laser oscillation changes along with the change of the laser oscillation wavelength. The two remarkable characteristics provide excellent conditions for obtaining the broadband tunable narrow linewidth optical fiber laser, so that the broadband tunable laser oscillation can be realized and the stable work of the broadband tunable narrow linewidth optical fiber laser can be ensured by welding a section of unpumped doped optical fiber in an optical fiber link.
(3) The utility model discloses a different wavelength work of tunable filter is realized in adjusting tunable filter operating voltage, and then realizes in 1520 ~ 1576nm wave band continuous tunable narrow linewidth laser output, and the laser linewidth is less than 1 Khz.
(4) The utility model discloses an optimize pumping source pumping power, erbium-doped fiber, unpumped erbium-doped fiber length and coupler splitting ratio can realize the output of the continuous tunable laser of narrow linewidth.
Drawings
Fig. 1 is a schematic structural diagram of a laser according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a laser according to another embodiment of the present invention.
Fig. 3 is a narrow linewidth tunable laser output spectrogram according to an embodiment of the present invention.
In the figure: 1: a pump source; 2: a wavelength division multiplexer; 3: an erbium-doped fiber; 4: a tunable filter; 5: an isolator; 6: a coupler; 7: a circulator; 8 unpumped erbium doped fiber; 9: a mirror; 10: 50/50 a coupler; 7-1: a first port; 7-2: a second port; 7-3: a third port; power: power; levelength: wavelength.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are only some embodiments, not all embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
The tunable narrow linewidth fiber laser of the present invention is described in detail below with reference to the following embodiments and accompanying drawings.
The tunable narrow linewidth fiber laser of the utility model can be described in two ways according to different using methods of the unpumped erbium-doped fiber, and the connection mode of each device in figure 1 is as follows: the tail fiber of the pump source 1 is connected with the pump end of the wavelength division multiplexer 2, the common end of the wavelength division multiplexer 2 is connected with the erbium-doped fiber 3, the other end of the erbium-doped fiber 3 is connected with the input end of the tunable filter 4, the output end of the tunable filter 4 is connected with the input end of the isolator 5, the output end of the isolator 5 is connected with the input end of the coupler 6, the small end of the coupler 6 is the output end of the tunable narrow-linewidth fiber laser, the first port 7-1 of the circulator is connected with the large end of the coupler 6, the second port 7-2 of the circulator is connected with the non-pumped erbium-doped fiber 8, the other end of the non-pumped erbium-doped fiber 8 is connected with the reflector.
The pump source 1 enters the erbium-doped fiber 3 through the wavelength division multiplexer 2, the erbium-doped fiber 3 is pumped by the pump of the pump source 1 to generate stimulated radiation, the tunable filter 4 carries out mode rough selection on the excited radiation, roughly selected laser sequentially passes through the isolator 5, the coupler 6, the circulator 7, the unpumped erbium-doped fiber 8, the reflector 9, the unpumped erbium-doped fiber 8, the circulator 7, the wavelength division multiplexer 2 in the anticlockwise direction and then enters the erbium-doped fiber 3, roughly selected laser oscillation is transmitted in the unpumped erbium-doped fiber 8 in a two-way mode, in the unpumped erbium-doped fiber, a phase grating is formed due to laser oscillation of bidirectional transmission to perform single longitudinal mode filtering on the roughly selected laser oscillation, so that multiple longitudinal mode components in the roughly selected laser are suppressed, narrow-linewidth laser is formed and then enters the erbium-doped fiber 3 to continue stimulated radiation amplification, and finally the narrow-linewidth laser is output through the small end of the coupler 4. The working voltage of the tunable filter 4 is changed to realize the working wavelength tuning, the tunable rough laser is further subjected to single longitudinal mode filtering through the unpumped erbium-doped fiber 8 to form tunable narrow linewidth laser output in the full-waveband range, as shown in fig. 3, the tunable narrow linewidth laser output is tested through a time delay self-heterodyne method, and based on the existence of inherent test errors of the test method, the linewidths of the lasers with different wavelengths are between 900Hz and 1 Khz.
Fig. 2 shows another implementation method, and the arrangement of the circulator 7, the unpumped erbium-doped fiber 8 and the mirror 9 in fig. 1 is replaced by a Sagnac loop formed by the 50/50 coupler 10 and the unpumped erbium-doped fiber 8, so that the same single longitudinal mode filtering function can be implemented, and the implementation function is not described again.
The working wavelength of the tunable filter 4 is 1520 to 1576nm, the tuning wavelength range of the tunable filter, the output wavelength range of the erbium-doped fiber and the narrow linewidth laser are matched, and when the working wavelength of the tunable filter is 1570 to 1610nm, the tunable filter can also realize the 1570 to 1610nm continuous tunable narrow linewidth laser output in the graph 1 or the graph 2.
Furthermore, all devices used by the narrow linewidth tunable laser are polarization maintaining devices, and all interconnected optical fibers adopt a fusion mode of slow axis alignment, so that the phenomenon that a lasing mode jumps caused by polarization disturbance is avoided.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. The tunable narrow linewidth optical fiber laser is characterized by comprising a pumping source, a wavelength division multiplexer, an erbium-doped optical fiber, a tunable filter, an isolator, a coupler and a single longitudinal mode filtering unit, wherein the wavelength division multiplexer, the erbium-doped optical fiber, the tunable filter, the isolator, the coupler and the single longitudinal mode filtering unit are connected to form a traveling wave resonant cavity; the tail fiber of the pumping source is connected with the pumping end of the wavelength division multiplexer, the common end of the wavelength division multiplexer is connected with one end of the erbium-doped fiber, the other end of the erbium-doped fiber is connected with the input end of the tunable filter, the output end of the tunable filter is connected with the input end of the isolator, the output end of the isolator is connected with the input end of the coupler, the small end of the coupler is the output end of the tunable narrow-linewidth fiber laser, the large end of the coupler is connected with the input end of the single longitudinal mode filtering unit, and the output end of the single longitudinal mode filtering unit is connected with the signal end of the wavelength division multiplexer.
2. The tunable narrow linewidth fiber laser of claim 1, wherein the single longitudinal mode filtering unit comprises a circulator, an unpumped erbium-doped fiber and a mirror, wherein a first port of the circulator is connected with a large end of the coupler, a second port of the circulator is connected with one end of the unpumped erbium-doped fiber, the other end of the unpumped erbium-doped fiber is connected with the mirror, and a third port of the circulator is connected with a signal end of the wavelength division multiplexer.
3. The tunable narrow linewidth fiber laser of claim 1, wherein the single longitudinal mode filtering unit comprises an unpumped erbium doped fiber and 50/50 coupler, the unpumped erbium doped fiber and 50/50 coupler forming a Sagnac loop.
4. The tunable narrow-linewidth fiber laser of claim 1, wherein the working voltage of the tunable filter is adjustable, and continuous tuning of the working wavelength in the 1520-1576 nm band is realized by adjusting the working voltage of the tunable filter.
5. The tunable narrow linewidth fiber laser of claim 4, wherein the tunable filter is a MEMS principle based tunable filter.
6. The tunable narrow linewidth fiber laser of claim 1, wherein the isolator and circulator are unidirectional devices.
7. The tunable narrow linewidth fiber laser of claim 2, wherein the reflectivity of the mirror is 90%.
8. The tunable narrow linewidth fiber laser of claim 1, wherein the devices within the tunable narrow linewidth fiber laser are polarization maintaining devices and all interconnected fibers are fusion spliced with slow axis alignment.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113410736A (en) * | 2021-05-24 | 2021-09-17 | 华南理工大学 | Tunable single-frequency pulse fiber laser |
| CN113572002A (en) * | 2021-06-29 | 2021-10-29 | 南京佰福激光技术有限公司 | Design method for half-wave plate control optical fiber coupling output laser |
| CN114530749A (en) * | 2022-02-24 | 2022-05-24 | 重庆大学 | Ultra-narrow linewidth integrated optical fiber laser based on distributed external feedback |
| CN114927923A (en) * | 2022-04-18 | 2022-08-19 | 中国电子科技集团公司第十一研究所 | Ultra-narrow linewidth fiber laser and system |
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2019
- 2019-11-28 CN CN201922115561.7U patent/CN210779482U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113410736A (en) * | 2021-05-24 | 2021-09-17 | 华南理工大学 | Tunable single-frequency pulse fiber laser |
| CN113572002A (en) * | 2021-06-29 | 2021-10-29 | 南京佰福激光技术有限公司 | Design method for half-wave plate control optical fiber coupling output laser |
| CN114530749A (en) * | 2022-02-24 | 2022-05-24 | 重庆大学 | Ultra-narrow linewidth integrated optical fiber laser based on distributed external feedback |
| CN114927923A (en) * | 2022-04-18 | 2022-08-19 | 中国电子科技集团公司第十一研究所 | Ultra-narrow linewidth fiber laser and system |
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