CN116914543A - Generating a Broadband Continuously Tunable Laser System - Google Patents
Generating a Broadband Continuously Tunable Laser System Download PDFInfo
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- CN116914543A CN116914543A CN202311172401.0A CN202311172401A CN116914543A CN 116914543 A CN116914543 A CN 116914543A CN 202311172401 A CN202311172401 A CN 202311172401A CN 116914543 A CN116914543 A CN 116914543A
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- 239000013307 optical fiber Substances 0.000 claims description 70
- 239000000835 fiber Substances 0.000 claims description 46
- 229910052775 Thulium Inorganic materials 0.000 claims description 15
- FRNOGLGSGLTDKL-UHFFFAOYSA-N thulium atom Chemical compound [Tm] FRNOGLGSGLTDKL-UHFFFAOYSA-N 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 10
- 238000005086 pumping Methods 0.000 claims description 8
- 230000005540 biological transmission Effects 0.000 abstract description 4
- 230000003595 spectral effect Effects 0.000 description 6
- 230000002269 spontaneous effect Effects 0.000 description 5
- 229910052797 bismuth Inorganic materials 0.000 description 4
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000004891 communication Methods 0.000 description 3
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- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 229910052761 rare earth metal Inorganic materials 0.000 description 2
- 150000002910 rare earth metals Chemical class 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 229910052691 Erbium Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000000862 absorption spectrum Methods 0.000 description 1
- 229910000323 aluminium silicate Inorganic materials 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 1
- UYAHIZSMUZPPFV-UHFFFAOYSA-N erbium Chemical compound [Er] UYAHIZSMUZPPFV-UHFFFAOYSA-N 0.000 description 1
- 238000000695 excitation spectrum Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 229910052732 germanium Inorganic materials 0.000 description 1
- -1 germanium ion Chemical class 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000003325 tomography Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06791—Fibre ring lasers
Abstract
The invention discloses a system for generating a broadband continuous tunable laser, which comprises a wavelength tunable device, a first laser annular cavity structure, a second laser annular cavity structure and a third laser annular cavity structure, wherein the first laser annular cavity structure is a rectangular structure; the wavelength tunable device is used for adjusting the laser wavelength; the first laser annular cavity structure is connected with the wavelength tunable device and is used for outputting long-wave-band laser; the second laser annular cavity structure is connected with the first laser annular cavity structure and the wavelength tunable device and is used for outputting middle-band laser; the third laser annular cavity structure is connected with the first laser annular cavity structure, the second laser annular cavity structure and the wavelength tunable device and is used for outputting short-wave-band laser. The characteristics that the ring cavity laser supports parallel generation and transmission of a plurality of laser modes are utilized, and a single wavelength tunable device is used for selectively adjusting the laser wavelength in the laser ring cavity structure, so that broadband continuous tunable laser output is realized.
Description
Technical Field
The invention relates to the technical field of fiber lasers, in particular to a system for generating a broadband continuously tunable laser.
Background
Communication band lasers typically operate in a spectral region ranging from 1.55 to 1.62 μm, and continuously tunable laser sources beyond this spectral coverage are expected to expand the application fields of laser communication and sensing. The tunable laser is beneficial to improving the resolution of optical tomography and promoting the development of laser imaging technology in biology and medical treatment at the wavelength of about 1.7 mu m; the requirements for remote and micro-chemical gas detection can be met if the spectral coverage of the tunable laser can cover 1.65 μm to 1.96 μm. In response to these increasing application demands, in recent years, various tunable fiber laser technologies have been developed, and the development of continuously tunable lasers has been advanced. A continuously tunable laser based on a thulium doped fiber can cover a spectral region in the range of 1.66 to 1.72 μm; further optimize the codoped ion of the thulium doped optical fiber, add germanium ion can expand the spectrum tuning range of the thulium doped optical fiber to the short wave range, and obtain the continuously tunable optical fiber laser between 1.62 and 1.66 mu m. Another way to obtain a fiber laser with a coverage of more than 1.60 μm wavelength is to use bismuth doped fibers. Typically, aluminosilicate-based bismuth-doped fibers are capable of providing a laser output of 1.15 μm, while phosphosilicate-based bismuth-doped fibers can support laser generation at a wavelength of 1.35 μm. Notably bismuth doped fibers doped with germanosilicates have the potential to produce longer wavelength laser outputs under excitation of long wavelength pump lasers. Although the two rare earth doped optical fibers can provide broadband laser output, under the framework of the prior art, tunable lasers with both output wave bands are generated in the same laser resonant cavity, and reliable technical means and methods are still lacking. The limitation of the technology is derived from the absorption and excitation characteristics of rare earth doped ions on one hand, and on the other hand, the widely used standing wave cavity laser structure sets an inherent barrier to the fusion use of various laser gain media.
Therefore, based on the above-mentioned problems, there is a need to develop a fiber laser cavity structure that can take into account various gain media, and solve the existing technical bottleneck.
Disclosure of Invention
The invention aims to overcome the defects of the background technology, and provides a system for generating a broadband continuous tunable laser, which realizes broadband continuous tunable laser output by using a single wavelength tunable device to selectively adjust the laser wavelength in a laser ring cavity structure by utilizing the characteristic that a ring cavity laser supports parallel generation and transmission of a plurality of laser modes.
In a first aspect, there is provided a system for producing a broadband continuously tunable laser, comprising:
the wavelength tunable device is used for adjusting the laser wavelength;
the first laser annular cavity structure is connected with the wavelength tunable device and is used for outputting long-wave-band laser;
the second laser annular cavity structure is connected with the first laser annular cavity structure and the wavelength tunable device and is used for outputting middle-band laser; the method comprises the steps of,
and the third laser annular cavity structure is connected with the first laser annular cavity structure, the second laser annular cavity structure and the wavelength tunable device and is used for outputting short-wave-band laser.
In some embodiments, the first laser ring cavity structure comprises: the device comprises a first pump laser, a first wavelength division multiplexer, a first optical fiber coupler, a second optical fiber coupler, a circulator, a wavelength tunable device, a second wavelength division multiplexer, a third wavelength division multiplexer and a thulium-doped optical fiber;
the first pump laser is connected with the pumping end of the first wavelength division multiplexer, the signal end of the first wavelength division multiplexer is connected with the first input end of the first optical fiber coupler, the output end of the first optical fiber coupler is connected with the first input end of the second optical fiber coupler, the output end of the second optical fiber coupler is connected with the input end of the circulator, the first output end of the circulator is connected with the wavelength tunable device, the second output end of the circulator is connected with the input end of the second wavelength division multiplexer, the first output end of the second wavelength division multiplexer is connected with the input end of the third wavelength division multiplexer, the first output end of the third wavelength division multiplexer is connected with the input end of the thulium doped optical fiber, and the output end of the thulium doped optical fiber is connected with the public end of the first wavelength division multiplexer;
in the first laser ring cavity structure, the wavelength tunable output end of the second optical fiber coupler outputs long-wave-band laser.
In some embodiments, the second laser ring cavity structure comprises: a second pump laser, the first fiber coupler, the second fiber coupler, the circulator, the wavelength tunable device, the second wavelength division multiplexer, the third wavelength division multiplexer, a bismuth-doped fiber, and a fourth wavelength division multiplexer;
the second pump laser is connected with the pump end of the fourth wavelength division multiplexer, and the signal end of the fourth wavelength division multiplexer is connected with the second input end of the first optical fiber coupler;
the second output end of the third wavelength division multiplexer is connected with the input end of the bismuth-doped optical fiber, and the output end of the bismuth-doped optical fiber is connected with the public end of the fourth wavelength division multiplexer;
in the second laser ring cavity structure, the wavelength tunable output end of the second optical fiber coupler outputs the middle-band laser.
In some embodiments, the third laser ring cavity structure comprises: a third pump laser, the second fiber coupler, the circulator, the wavelength tunable device, the second wavelength division multiplexer, an erbium-doped fiber, and a fifth wavelength division multiplexer;
the third pump laser is connected with the pump end of the fifth wavelength division multiplexer, and the signal end of the fifth wavelength division multiplexer is connected with the second input end of the second optical fiber coupler;
the second output end of the second wavelength division multiplexer is connected with the input end of the erbium-doped optical fiber, and the output end of the erbium-doped optical fiber is connected with the public end of the fifth wavelength division multiplexer;
in the third laser ring cavity structure, the wavelength tunable output end of the second optical fiber coupler outputs short-wave-band laser.
In some embodiments, the long-band laser is a 1.80 μm-1.98 μm-band laser, the medium-band laser is a 1.60-1.80 μm-band laser, and the short-band laser is a 1.54-1.60 μm-band laser.
In some embodiments, the wavelength tunable device includes a collimating lens connected to the first output end of the circulator, a diffraction grating disposed on a side of a laser output end of the collimating lens, and a rotating device disposed at a bottom of the diffraction grating and driving the diffraction grating to rotate.
In some embodiments, the wavelength tunable device includes a collimating lens connected to the first output end of the circulator, a bulk grating disposed on a side of a laser output end of the collimating lens, and a temperature regulator for performing periodic structure regulation on the bulk grating.
Compared with the prior art, the invention utilizes the characteristic that the ring cavity laser supports parallel generation and transmission of a plurality of laser modes, various gain media in the first laser ring cavity structure, the second laser ring cavity structure and the third laser ring cavity structure are connected in series and parallel, and then a single wavelength tunable device is used for selectively adjusting the laser wavelength in the laser ring cavity structure, so that broadband continuous tunable laser output is realized, namely the first laser ring cavity structure outputs long-wave-band laser, the second laser ring cavity structure outputs medium-wave-band laser, and the third laser ring cavity structure outputs short-wave-band laser.
Drawings
FIG. 1 is a schematic diagram of a system for producing a broadband continuously tunable laser of the present invention;
fig. 2 is a schematic diagram of the structure of a wavelength tunable device of the present invention.
Reference numerals:
101. a first pump laser; 102. a first wavelength division multiplexer; 103. thulium doped optical fibers; 104. a first optical fiber coupler; 105. a second fiber coupler; 106. a wavelength tunable output; 107. a circulator; 108. a wavelength tunable device; 109. a second wavelength division multiplexer; 110. a third wavelength division multiplexer; 111. a second pump laser; 112. a fourth wavelength division multiplexer; 113. bismuth-doped optical fiber; 114. a third pump laser; 115. a fifth wavelength division multiplexer; 116. an erbium-doped optical fiber; 201. a collimating lens; 202. a diffraction grating; 203. a rotating device; 204. a volume grating; 205. a temperature regulator.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, an embodiment of the present invention provides a system for generating a broadband continuously tunable laser, comprising:
a wavelength tunable device 108 for adjusting the laser wavelength;
a first laser ring cavity structure connected to the wavelength tunable device 108 for outputting long-wavelength laser light;
the second laser ring cavity structure is connected with the first laser ring cavity structure and the wavelength tunable device 108 and is used for outputting the middle-band laser; the method comprises the steps of,
and a third laser ring cavity structure connected with the first laser ring cavity structure, the second laser ring cavity structure and the wavelength tunable device 108, and configured to output short-band laser light.
In particular, in this embodiment, since the output wavelength of the tunable fiber laser is limited by the spontaneous radiation bandwidth of the gain medium, it is difficult to achieve continuous tuning output in the spectral range of 1.5-1.98 μm; therefore, the invention utilizes the characteristic that the ring cavity laser supports the parallel generation and transmission of a plurality of laser modes, various gain media in the first laser ring cavity structure, the second laser ring cavity structure and the third laser ring cavity structure are connected in series and parallel, and then the single wavelength tunable device 108 is used for selectively adjusting the laser wavelength in the laser ring cavity structure, so that the broadband continuous tunable laser output is realized, namely the first laser ring cavity structure outputs long-wave-band laser, the second laser ring cavity structure outputs medium-wave-band laser, and the third laser ring cavity structure outputs short-wave-band laser.
Optionally, the first laser ring cavity structure includes: a first pump laser 101, a first wavelength division multiplexer 102, a first fiber coupler 104, a second fiber coupler 105, a circulator 107, a wavelength tunable device 108, a second wavelength division multiplexer 109, a third wavelength division multiplexer 110, and a thulium doped fiber 103;
the first pump laser 101 is connected to the pump end of the first wavelength division multiplexer 102, the signal end of the first wavelength division multiplexer 102 is connected to the first input end of the first optical fiber coupler 104, the output end of the first optical fiber coupler 104 is connected to the first input end of the second optical fiber coupler 105, the output end of the second optical fiber coupler 105 is connected to the input end of the circulator 107, the first output end of the circulator 107 is connected to the wavelength tunable device 108, the second output end of the circulator 107 is connected to the input end of the second wavelength division multiplexer 109, the first output end of the second wavelength division multiplexer 109 is connected to the input end of the third wavelength division multiplexer 110, the first output end of the third wavelength division multiplexer 110 is connected to the input end of the thulium doped optical fiber 103, and the output end of the thulium doped optical fiber 103 is connected to the common end of the first wavelength division multiplexer 102;
wherein in the first laser ring cavity structure, the wavelength tunable output end 106 of the second fiber coupler 105 outputs a long-band laser.
Specifically, in this embodiment, the first pump laser 101 may be different lasers according to application requirements, and may be a 793nm semiconductor laser, 1180nm fiber laser, 1567nm fiber laser, or the like, for pumping the thulium doped fiber 103.
The first fiber coupler 104 is a three-port fiber optic device compatible with coupling and splitting of the 1.54-1.94 μm laser band. The second fiber coupler 105 is a four-port fiber optic device compatible with coupling and splitting in the 1.54-1.94 μm band.
The output end of the circulator 107 is respectively connected with a second wavelength division multiplexer 109 and a wavelength tunable device 108, and is used for fixing the running directions of laser in the three annular cavity structures;
the wavelength tunable device 108 is a reflective element with wavelength selectivity that enables wavelength selection and continuous tuning under the control of an external control signal.
The first pump laser 101 is connected to the first wavelength division multiplexer 102, and the common end thereof is connected to the thulium doped fiber 103 for reverse pumping. A portion of the laser light passes through the first input end of the first fiber coupler 104 and outputs tunable laser light of 1.80 μm to 1.98 μm at the wavelength tunable output end 106 of the second fiber coupler 105; the other part of laser is input through the input end of the circulator 107 and is input to the wavelength tunable device 108 through the first output end of the circulator 107; the remaining tunable laser light of 1.80 μm to 1.98 μm is coupled into the thulium doped optical fiber 103 through the second wavelength division multiplexer 109 and the third wavelength division multiplexer 110, forming a tunable ring cavity-first laser ring cavity structure of 1.8 μm to 1.98 μm, so that in the first laser ring cavity structure, the long wavelength band laser light output from the wavelength tunable output end 106 of the second optical fiber coupler 105 is in a wavelength band of 1.80 μm to 1.98 μm.
Optionally, the second laser ring cavity structure includes: a second pump laser 111, the first optical fiber coupler 104, the second optical fiber coupler 105, the circulator 107, the wavelength tunable device 108, the second wavelength division multiplexer 109, the third wavelength division multiplexer 110, a bismuth-doped optical fiber 113, and a fourth wavelength division multiplexer 112;
the second pump laser 111 is connected to the pump end of the fourth wavelength division multiplexer 112, and the signal end of the fourth wavelength division multiplexer 112 is connected to the second input end of the first optical fiber coupler 104;
a second output end of the third wavelength division multiplexer 110 is connected with an input end of the bismuth-doped optical fiber, and an output end of the bismuth-doped optical fiber is connected with a common end of the fourth wavelength division multiplexer 112;
wherein, in the second laser ring cavity structure, the wavelength tunable output end 106 of the second optical fiber coupler 105 outputs the mid-band laser light.
Specifically, in this embodiment, the second pump laser 111 may be a semiconductor laser of 1270nm or an optical fiber laser of 1540nm, which is used for pumping the bismuth-doped fiber, and may be different lasers according to application requirements.
The second pump laser 111 is coupled through the pump end of the fourth wavelength division multiplexer 112, the common end of the second pump laser is connected with the bismuth-doped optical fiber, and a part of laser is coupled to the wavelength tunable output end 106 of the second optical fiber coupler 105 through the second input end of the first optical fiber coupler 104 to output tunable laser with the wavelength of 1.60 μm to 1.80 μm; the other part of the tunable laser is input through the input end of the circulator 107 and is input to the wavelength tunable device 108 through the first output end of the circulator 107, and the remaining tunable laser with the wavelength of 1.60 mu m to 1.80 mu m is coupled into the bismuth doped optical fiber through the second wavelength division multiplexer 109 and the third wavelength division multiplexer 110 to form a tunable ring cavity-second laser ring cavity structure with the wavelength of 1.60 mu m to 1.80 mu m; thus, in the second laser ring cavity structure, the wavelength tunable output end 106 of the second fiber coupler 105 outputs the mid-band laser light in a wavelength band of 1.60 μm to 1.80 μm.
Optionally, the third laser ring cavity structure includes: a third pump laser 114, the second fiber coupler 105, the circulator 107, the wavelength tunable device 108, the second wavelength division multiplexer 109, an erbium doped fiber 116, and a fifth wavelength division multiplexer 115;
the third pump laser 114 is connected to the pump end of the fifth wavelength division multiplexer 115, and the signal end of the fifth wavelength division multiplexer 115 is connected to the second input end of the second optical fiber coupler 105;
a second output end of the second wavelength division multiplexer 109 is connected to an input end of the erbium-doped fiber 116, and an output end of the erbium-doped fiber 116 is connected to a common end of the fifth wavelength division multiplexer 115;
wherein in the third laser ring cavity structure, the wavelength tunable output end 106 of the second fiber coupler 105 outputs a short-wavelength laser.
Optionally, the long-wave band laser is 1.80-1.98 μm-wave band laser, the medium-wave band laser is 1.60-1.80 μm-wave band laser, and the short-wave band laser is 1.54-1.60 μm-wave band laser.
Specifically, in this embodiment, the second wavelength division multiplexer 109 may divide the laser signal in the ring cavity into two bands of 1.54-1.60 μm and 1.60 μm-1.98 μm, the long band of 1.60 μm-1.98 μm enters the third wavelength division multiplexer 110, and the short band of 1.54-1.60 μm enters the fifth wavelength division multiplexer 115, so as to form a third laser ring cavity structure for generating short band laser; the third wavelength division multiplexer 110 divides the laser signal 1.60 μm-1.98 μm in the ring cavity into two bands of 1.60 μm-1.80 μm and 1.80 μm-1.98 μm, the long band of 1.80 μm-1.98 μm enters the thulium doped fiber 103 to form a first laser ring cavity structure generating long band laser, and the short band of 1.60 μm-1.80 μm enters the bismuth doped fiber to form a second laser ring cavity structure generating middle band laser.
In operation of the wavelength tunable device 108, the direction of travel within the three series-parallel third laser ring cavity structures is shown by the arrows in fig. 1.
Therefore, the output wavelength of the wavelength tunable fiber laser is limited by the spontaneous radiation bandwidth of the gain medium, and continuous tuning output in the spectral range of 1.54-198 μm is difficult to realize, so the invention proposes to solve the problem by using a mode of connecting multiple gain fibers in parallel. And by utilizing the characteristics of overlap of the absorption spectrum of the thulium-doped and bismuth-doped optical fibers and the excitation spectrum of the erbium-doped optical fibers, cascade pumping is realized in the annular cavity, and the light-light conversion efficiency of the laser is improved.
It should be noted that the second wavelength division multiplexer 109 may inject the residual 1.54 μm spontaneous emission into the second annular cavity for pumping the bismuth-doped optical fiber, and the portion of the 1.57 μm spontaneous emission generated by the bismuth-doped optical fiber may be used for pumping the thulium-doped optical fiber 103. The reuse of the residual spontaneous emission is achieved.
Because how to realize broadband laser tuning is a key link for obtaining continuous tunable laser output covering 1.54-1.98 mu m; the wavelength tunable device 108 may have two configurations as follows.
Referring to fig. 2 (a), the wavelength tunable device 108 includes a collimator lens 201 connected to the first output end of the circulator 107, a diffraction grating 202 disposed on the laser output end side of the collimator lens 201, and a rotation device 203 disposed at the bottom of the diffraction grating 202 and driving the diffraction grating 202 to rotate.
Specifically, in this embodiment, after the laser light output by the collimating lens 201 passes through the diffraction grating 202, the diffracted light is directly output, which is the output end of the tunable laser, and the reflected light meeting the littrow angle is re-coupled into the collimating lens 201 and returns to the laser ring cavity structure; wavelength tunable output is achieved by controlling the angle of the rotation means 203.
Referring to fig. 2 (b), the wavelength tunable device 108 includes a collimator lens 201 connected to the first output end of the circulator 107, a bulk grating 204 disposed at a side of a laser output end of the collimator lens 201, and a temperature regulator 205 for periodically regulating the bulk grating 204.
Specifically, in this embodiment, after the laser light output by the collimating lens 201 passes through the bulk grating 204, the transmitted light is directly output as the output end of the tunable laser, and the laser light reflected by the bulk grating 204 is re-coupled into the collimating lens 201 and returns to the laser cavity; the regulation and control of the periodic structure of the bulk grating 204 are realized by changing the stability of the temperature controller, so that the reflection wavelength is controlled, and the wavelength tunable output is obtained.
In the description of the present invention, it should be noted that the azimuth or positional relationship indicated by the terms "upper", "lower", etc. are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of describing the present invention and simplifying the description, and are not indicative or implying that the apparatus or element in question must have a specific azimuth, be constructed and operated in a specific azimuth, and thus should not be construed as limiting the present invention. Unless specifically stated or limited otherwise, the terms "mounted," "connected," and "coupled" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
It should be noted that in the present invention, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The foregoing is only a specific embodiment of the invention to enable those skilled in the art to understand or practice the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (7)
1. A system for producing a broadband continuously tunable laser, comprising:
the wavelength tunable device is used for adjusting the laser wavelength;
the first laser annular cavity structure is connected with the wavelength tunable device and is used for outputting long-wave-band laser;
the second laser annular cavity structure is connected with the first laser annular cavity structure and the wavelength tunable device and is used for outputting middle-band laser; the method comprises the steps of,
the third laser annular cavity structure is connected with the first laser annular cavity structure, the second laser annular cavity structure and the wavelength tunable device and is used for outputting short-wave-band laser;
various gain media in the first laser annular cavity structure, the second laser annular cavity structure and the third laser annular cavity structure are connected in series-parallel, and then a single wavelength tunable device is used for selectively adjusting the laser wavelength in the laser annular cavity structure, so that broadband continuous tunable laser output is realized.
2. The system for producing a broadband continuously tunable laser of claim 1, wherein the first laser ring cavity structure comprises: the device comprises a first pump laser, a first wavelength division multiplexer, a first optical fiber coupler, a second optical fiber coupler, a circulator, a wavelength tunable device, a second wavelength division multiplexer, a third wavelength division multiplexer and a thulium-doped optical fiber;
the first pump laser is connected with the pumping end of the first wavelength division multiplexer, the signal end of the first wavelength division multiplexer is connected with the first input end of the first optical fiber coupler, the output end of the first optical fiber coupler is connected with the first input end of the second optical fiber coupler, the output end of the second optical fiber coupler is connected with the input end of the circulator, the first output end of the circulator is connected with the wavelength tunable device, the second output end of the circulator is connected with the input end of the second wavelength division multiplexer, the first output end of the second wavelength division multiplexer is connected with the input end of the third wavelength division multiplexer, the first output end of the third wavelength division multiplexer is connected with the input end of the thulium doped optical fiber, and the output end of the thulium doped optical fiber is connected with the public end of the first wavelength division multiplexer;
in the first laser ring cavity structure, the wavelength tunable output end of the second optical fiber coupler outputs long-wave-band laser.
3. The system for producing a broadband continuously tunable laser of claim 2, wherein the second laser ring cavity structure comprises: a second pump laser, the first fiber coupler, the second fiber coupler, the circulator, the wavelength tunable device, the second wavelength division multiplexer, the third wavelength division multiplexer, a bismuth-doped fiber, and a fourth wavelength division multiplexer;
the second pump laser is connected with the pump end of the fourth wavelength division multiplexer, and the signal end of the fourth wavelength division multiplexer is connected with the second input end of the first optical fiber coupler;
the second output end of the third wavelength division multiplexer is connected with the input end of the bismuth-doped optical fiber, and the output end of the bismuth-doped optical fiber is connected with the public end of the fourth wavelength division multiplexer;
in the second laser ring cavity structure, the wavelength tunable output end of the second optical fiber coupler outputs the middle-band laser.
4. The system for producing a broadband continuously tunable laser of claim 2, wherein the third laser ring cavity structure comprises: a third pump laser, the second fiber coupler, the circulator, the wavelength tunable device, the second wavelength division multiplexer, an erbium-doped fiber, and a fifth wavelength division multiplexer;
the third pump laser is connected with the pump end of the fifth wavelength division multiplexer, and the signal end of the fifth wavelength division multiplexer is connected with the second input end of the second optical fiber coupler;
the second output end of the second wavelength division multiplexer is connected with the input end of the erbium-doped optical fiber, and the output end of the erbium-doped optical fiber is connected with the public end of the fifth wavelength division multiplexer;
in the third laser ring cavity structure, the wavelength tunable output end of the second optical fiber coupler outputs short-wave-band laser.
5. The system of claim 1, wherein the long-band laser is a 1.80 μm-1.98 μm-band laser, the medium-band laser is a 1.60 μm-1.80 μm-band laser, and the short-band laser is a 1.54 μm-1.60 μm-band laser.
6. The system of claim 2, wherein the wavelength tunable device comprises a collimating lens coupled to the first output of the circulator, a diffraction grating disposed on a side of the laser output of the collimating lens, and a rotation device disposed at a bottom of the diffraction grating and driving the diffraction grating to rotate.
7. The system of claim 2, wherein the wavelength tunable device comprises a collimating lens connected to the first output end of the circulator, a volume grating disposed on a side of the laser output end of the collimating lens, and a temperature regulator for periodically controlling the volume grating.
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