CN205081351U - High -power L wave band erbium doped fiber amplifier of all optical fibre structure - Google Patents
High -power L wave band erbium doped fiber amplifier of all optical fibre structure Download PDFInfo
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- CN205081351U CN205081351U CN201520785422.4U CN201520785422U CN205081351U CN 205081351 U CN205081351 U CN 205081351U CN 201520785422 U CN201520785422 U CN 201520785422U CN 205081351 U CN205081351 U CN 205081351U
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- 239000000835 fiber Substances 0.000 title claims abstract description 85
- 239000013307 optical fiber Substances 0.000 title claims abstract description 21
- 229910052691 Erbium Inorganic materials 0.000 title abstract description 4
- UYAHIZSMUZPPFV-UHFFFAOYSA-N erbium Chemical compound [Er] UYAHIZSMUZPPFV-UHFFFAOYSA-N 0.000 title abstract description 4
- 230000003287 optical effect Effects 0.000 claims abstract description 107
- 238000005086 pumping Methods 0.000 claims abstract description 74
- 238000001228 spectrum Methods 0.000 claims description 9
- 238000012360 testing method Methods 0.000 claims description 9
- 239000013589 supplement Substances 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 abstract description 7
- 230000004927 fusion Effects 0.000 abstract 1
- 230000005855 radiation Effects 0.000 description 6
- 230000007704 transition Effects 0.000 description 6
- 239000002245 particle Substances 0.000 description 5
- 230000002269 spontaneous effect Effects 0.000 description 5
- 230000003321 amplification Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000003199 nucleic acid amplification method Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 241001125929 Trisopterus luscus Species 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000005283 ground state Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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Abstract
The utility model discloses a high -power L wave band erbium doped fiber amplifier of all optical fibre structure. The utility model discloses a front end optical isolator, front end optical coupler, the front end circulator, 980nm single mode laser pumping source, the single mode pumping is closed and is restrainted the ware, the single mode er -doped fiber, front end faraday rotation mirror, middle -end optical coupler, middle -end optical isolator, the rear end circulator, 980 multimode laser pumping source, multimode / double -contracting layer pumping is closed and is restrainted the ware, double -contracting layer er -doped fiber, rear end faraday rotation mirror, rear end optical coupler, rear end optical isolator, above -mentioned connection structure all adopts the optic fibre butt fusion. The utility model discloses the L wave band laser energy that obtains reaches big power output requirement, and the conversion efficiency of pumping is high, stable good, and the low price has higher price / performance ratio.
Description
Technical field
The utility model belongs to large-power optical fiber amplifier manufacturing technology field, particularly a kind of high-power L-wave-band erbium-doped fiber amplifier of all optical fibre structure.The utility model can be applied to fibres submarine telecommunication, on a large scale, the numerous areas such as the light sensing of dense distribution sensing point.
Background technology
Erbium-doped fiber amplifier (EDFA) is the Primary Component in optical fiber telecommunications system, research along with C-band (1520 ~ 1565nm) light source is tending towards ripe and market-oriented, for meeting the requirement of optical communication to bandwidth, the research of expansion L-band light source and related device just seems more and more urgent.In distributed fiber grating sensing, in order to meet on a large scale, the application of dense distribution sensing point, solve ranging scope and distribution count between contradictory relation, then need the light source of high power, wide bandwidth.
The afterbody that traditional L-band EDFA composes owing to being operated in erbium fiber gain, the shortcomings such as it exists, and power output is low, gain is low, work conversion efficiency is low, noise is large.Therefore, analysis and design meets the L-band EDFA with large power output and high-gain of high density Wave division multiplexing technology and fibres submarine telecommunication demand for development is very significant.
Summary of the invention
The purpose of this utility model is for the deficiencies in the prior art, provides a kind of high-power L-wave-band erbium-doped fiber amplifier of all optical fibre structure.
The utility model solves the technical scheme that its high-power technical problem adopts and comprises following content:
The high-power L-wave-band erbium-doped fiber amplifier of all optical fibre structure, comprises front end optical isolator, front end optical coupler, front end circulator, 980nm single-mode laser pumping source, single-mode pumping beam combiner, single mode Er-doped fiber, front end faraday rotation mirror, middle-end optical coupler, middle-end optical isolator, rear end circulator, 980 multi-mode laser pumping sources, multimode/double clad pump combiner, double clad Er-doped fiber, rear end faraday rotation mirror, rear end optical coupler and rear end optical isolator;
Laser input is connected with front end optical isolator input port, front end optical isolator output port is connected with the input port of front end optical coupler, an output port of front end optical coupler is connected with the first port of front end circulator, the unsettled spectrum situation that can be used to optical system for testing of another output port of front end optical coupler, second port of front end circulator is connected with the signal input port of single-mode pumping beam combiner, the pumping input port of single-mode pumping beam combiner is connected with 980nm single-mode laser pumping source, the output port of single-mode pumping beam combiner is connected with one end of single mode Er-doped fiber, the other end of single mode Er-doped fiber is connected with front end faraday rotation mirror.3rd port of front end circulator is connected with the input port of middle-end optical coupler, first output port of middle-end optical coupler is connected with the input port of middle-end optical isolator 9, the unsettled spectrum situation that can be used to optical system for testing of another output port of middle-end optical coupler, the output port of middle-end optical isolator is connected with the first port of rear end circulator, second port of rear end circulator is connected with the signal input port of multimode/double clad pump combiner, two input ports of the pumping of multimode/double clad pump combiner are connected with two 980 multi-mode laser pumping sources respectively, the output port of multimode/double clad pump combiner is connected with one end of double clad Er-doped fiber, the other end of double clad Er-doped fiber is connected with rear end faraday rotation mirror, 3rd port of rear end circulator is connected with the input port of rear end optical coupler, the output port of rear end optical coupler is connected with the input of rear end optical isolator, the unsettled spectrum situation that can be used to optical system for testing of another output port of rear end optical coupler, the output port of rear end optical isolator is signal output port.
Above-mentioned syndeton all adopts fused fiber splice.
First delivery outlet of front end optical coupler is 99% output, and the second delivery outlet is 1% delivery outlet; Second delivery outlet is that light path detects mouth, and splitting ratio can change according to the actual requirements to some extent.
First delivery outlet of middle-end optical coupler is 99% output, and the second delivery outlet is 1% delivery outlet.Second delivery outlet is that light path detects mouth, and splitting ratio can change according to the actual requirements to some extent.
First delivery outlet of rear end optical coupler is 99% output, and the second delivery outlet is 1% delivery outlet.Second delivery outlet w is that light path detects mouth, and splitting ratio can change according to the actual requirements to some extent.
Front end faraday rotation mirror and rear end faraday rotation mirror play reflected light path, make the light path long enough through Er-doped fiber in light path, make that the gain of C-band is as much as possible is converted into L-band gain, and the form of circulator, coupler, fiber end face mirror or grating can be used to replace front end faraday rotation mirror and rear end faraday rotation mirror
Single-mode pumping beam combiner is that conjunction bundle is carried out in single-mode laser pumping and flashlight, situation can be selected to determine the operation wavelength of the pumping end of 915nm or 980nm according to pumping.
Multimode/double clad pump combiner is that conjunction bundle is carried out in multi-mode laser pumping and flashlight, situation can be selected to determine the operation wavelength of two pump ports of 915nm or 980nm according to pumping.
The pumping of 980nm single-mode laser is used for carrying out energy supplement to Er-doped fiber wavelength convert, can replace with the single-mode laser pumping source of 915nm;
980nm multi-mode laser pumping source is used for carrying out energy supplement to er-doped doubly clad optical fiber wavelength convert, can substitute with the multi-mode laser pumping source of 915nm, when pump light is greater than 10W time, powerful 980nm optical isolator is set between 980nm multi-mode laser pumping source and two pump ports of multimode/double clad pump combiner.
L-band power output is greater than 2W, and bandwidth of operation is 1570nm ~ 1620nm, 10nm more than common L-band amplifier, and gain is on average greater than 23dB, 3dB larger than common L-band amplifier.
Utility model works flow process is as follows:
When L-band flashlight is by optical isolator, front end optical coupler, front end circulator, 980nm single-mode laser pumping source, single-mode pumping beam combiner, when 980nm single-mode laser pumping source is by single-mode pumping beam combiner, single mode Er-doped fiber, in single mode Er-doped fiber, produce the broadband light gain of C+L wave band, the flashlight of L-band amplifies in single mode Er-doped fiber.Signal after amplification and the C-band of residual fraction are reflected back toward in single mode Er-doped fiber by front end faraday rotation mirror, the C-band spontaneous radiation gain of residual fraction is continued to be absorbed as L-band gain by single mode Er-doped fiber, the flashlight of L-band continues to be exaggerated, and enters middle-end optical coupler, middle-end optical isolator, rear end circulator and multimode/double clad pump combiner by single-mode pumping beam combiner and front end circulator from the j port of circulator.The L-band gain that 980nm multi-mode laser pumping source is larger before multimode/double clad pump combiner and double clad Er-doped fiber produce comparatively, amplify the flashlight after twice to be increased substantially by gain after double clad Er-doped fiber, through three amplifying signal light after the reflection of rear end faraday rotation mirror, again enter double clad Er-doped fiber carry out flashlight carry out the 4th time amplify, then through multimode/double clad pump combiner, the input of rear end optical coupler is entered by the 3rd port t of rear end circulator, the light of outgoing is through rear end optical isolator, the L-band flashlight after final amplification is exported from the output port of rear end optical isolator.
Above-mentioned syndeton all adopts fused fiber splice.
The utility model beneficial effect is as follows:
The utility model obtains L-band power output and is greater than 2W, bandwidth of operation is 1570nm ~ 1620nm, 10nm more than common L-band amplifier (1570nm ~ 1610), gain is on average greater than 23dB, 3dB larger than common L-band amplifier, employing all optical fibre structure links, and cost is low, Stability Analysis of Structures.
Accompanying drawing explanation
Fig. 1 is Er
3+simplification level structure schematic diagram.
Fig. 2 is the structural representation of all-fiber L-band erbium-doped fiber amplifier.
Fig. 3 is the power output of all-fiber L-band erbium-doped fiber amplifier and the comparison diagram of pump conversion efficiency and general structure.
Fig. 4 is the spectrogram of all-fiber L-band erbium-doped fiber amplifier.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described further.
Fig. 1 is Er
3+simplification level structure schematic diagram.N in figure
0for ground state level, N
1for metastable energy level, N
2for pump excitation state energy level.Er-doped fiber does gain medium, when previous section by single-mode pumping beam combiner 5, single mode Er-doped fiber 6 of 980nm single-mode laser pumping source 4, and N
0on particle absorption 980nm pump light, transit to N
2, N
2→ N
1for nonradiative transition accounts for leading and transition time is extremely short, N
2the particle overwhelming majority under transition falls into N by nonradiative transition
1, then N
1→ N
0take spontaneous radiation as the leading factor for radiation transistion to recur, therefore at N
1→ N
0between produce the light radiation of continuous print C-band.In the aft section of single mode Er-doped fiber 6, the radiant light of C-band continues by erbium particle absorption, and due to the energy loss of centre, particle is excited to N
1main energy level Stark splitting energy level low-lying level on, particle carries out N again
1→ N
0the light radiation of L-band is given off when transition.Therefore, C-band amplified spontaneous emission is by N
1and N
0between the high level of the Stark splitting energy level of main energy level, transition produces, and the amplified spontaneous emission of L-band is N
1and N
0transition between the low-lying level of the Stark splitting energy level of main energy level produces.
Fig. 2 is the structural representation of high-power L-wave-band full fiber type amplifier.High-power L-wave-band full fiber type amplifier, it is characterized in that comprising front end optical isolator 1, front end optical coupler 2, front end circulator 3,980nm single-mode laser pumping source 4, single-mode pumping beam combiner 5, single mode Er-doped fiber 6, front end faraday rotation mirror 7, middle-end optical coupler 8, middle-end optical isolator 9, rear end circulator 10,980 multi-mode laser pumping source 11, multimode/double clad pump combiner 12, double clad Er-doped fiber 13, rear end faraday rotation mirror 14, rear end optical coupler 15, rear end optical isolator 16, its connection is:
Laser input is connected with front end optical isolator 1 input port, front end optical isolator 1 output port is connected with the input port a of front end optical coupler 2, the output port b of front end optical coupler 2 is connected with the first port d of front end circulator 3, the unsettled spectrum situation that can be used to optical system for testing of another output port c of front end optical coupler 2, second port of front end circulator 3 is connected with the signal input port h of single-mode pumping beam combiner 5, the pumping input port f of single-mode pumping beam combiner 5 is connected with 980nm single-mode laser pumping source 4, the output port i of single-mode pumping beam combiner 5 is connected with one end of single mode Er-doped fiber 6, the other end of single mode Er-doped fiber 6 is connected with front end faraday rotation mirror 7.3rd port j of front end circulator 3 is connected with the input port k of middle-end optical coupler 8, first of middle-end optical coupler 8 exports l and is connected with the input port of middle-end optical isolator 9, the unsettled spectrum situation that can be used to optical system for testing of another output port m of middle-end optical coupler 8, the output port of middle-end optical isolator 9 is connected with the first port n of rear end circulator 10, second port o of rear end circulator 10 is connected with the signal input port r of multimode/double clad pump combiner 12, pumping input port p with q of multimode/double clad pump combiner 12 is connected with two 980 multi-mode laser pumping sources 11 respectively, the output port s of multimode/double clad pump combiner 12 is connected with one end of double clad Er-doped fiber 13, the other end of double clad Er-doped fiber 13 is connected with rear end faraday rotation mirror, 3rd port t of rear end circulator 10 is connected with the input port u of rear end optical coupler 15, the output port v of rear end optical coupler 15 is connected with the input of rear end optical isolator 16, the unsettled spectrum situation that can be used to optical system for testing of another output port w of rear end optical coupler 15, the output port of rear end optical isolator 16 is signal output port.Above-mentioned syndeton all adopts fused fiber splice.
Above-mentioned front end optical isolator 1, front end optical coupler 2, front end circulator 3, 980nm single-mode laser pumping source 4, single-mode pumping beam combiner 5, single mode Er-doped fiber 6, front end faraday rotation mirror 7, middle-end optical coupler 8, middle-end optical isolator 9, rear end circulator 10, 980 multi-mode laser pumping sources 11, multimode/double clad pump combiner 12, double clad Er-doped fiber 13, rear end faraday rotation mirror 14, rear end optical coupler 15, device such as rear end optical isolator 16 grade all adopts prior art.
When L-band flashlight is by optical isolator 1, front end optical coupler 2, front end circulator 3,980nm single-mode laser pumping source 4, single-mode pumping beam combiner 5, when 980nm single-mode laser pumping source 4 is by single-mode pumping beam combiner 5, single mode Er-doped fiber 6, in single mode Er-doped fiber 6, produce the broadband light gain of C+L wave band, the flashlight of L-band amplifies in single mode Er-doped fiber 6.Signal after amplification and the C-band of residual fraction are reflected back toward in single mode Er-doped fiber 6 by front end faraday rotation mirror 7, the C-band spontaneous radiation gain of residual fraction is continued to be absorbed as L-band gain by single mode Er-doped fiber 6, the flashlight of L-band continues to be exaggerated, and enters middle-end optical coupler 8, middle-end optical isolator 9, rear end circulator 10 and multimode/double clad pump combiner 12 by single-mode pumping beam combiner 5 and front end circulator 3 from the j port of circulator.The L-band gain that 980nm multi-mode laser pumping source 11 is larger before multimode/double clad pump combiner 12 and double clad Er-doped fiber 13 produce comparatively, amplify the flashlight after twice to be increased substantially by gain after double clad Er-doped fiber 13, through three amplifying signal light after the reflection of rear end faraday rotation mirror 14, again enter double clad Er-doped fiber 13 carry out flashlight carry out the 4th time amplify, then through multimode/double clad pump combiner 12, the input of rear end optical coupler 15 is entered by the 3rd port t of rear end circulator 10, the light of outgoing is through rear end optical isolator 16, the L-band flashlight after final amplification is exported from the output port of rear end optical isolator 16.
Fig. 3 is the power output of all-fiber L-band erbium-doped fiber amplifier and the comparison diagram of pump conversion efficiency and general structure.Power output (the Pout of all-fiber L-band erbium-doped fiber amplifier, DP) power output (Pout of 2W than general structure is greater than, SP) 1W is high nearly one times, pump conversion efficiency (PCE, DP) than the pump conversion efficiency (PCE of general structure, SP) also high nearly one times, illustrate that the utility model structure used has better power output and pump conversion efficiency.
Fig. 4 is the spectrogram of all-fiber L-band erbium-doped fiber amplifier, and its bandwidth of operation is 1570 ~ 1620nm, more than common L-band amplifier bandwidth of 10nm.
Claims (10)
1. the high-power L-wave-band erbium-doped fiber amplifier of all optical fibre structure, is characterized in that comprising front end optical isolator, front end optical coupler, front end circulator, 980nm single-mode laser pumping source, single-mode pumping beam combiner, single mode Er-doped fiber, front end faraday rotation mirror, middle-end optical coupler, middle-end optical isolator, rear end circulator, 980 multi-mode laser pumping sources, multimode/double clad pump combiner, double clad Er-doped fiber, rear end faraday rotation mirror, rear end optical coupler and rear end optical isolator;
Laser input is connected with front end optical isolator input port, front end optical isolator output port is connected with the input port of front end optical coupler, an output port of front end optical coupler is connected with the first port of front end circulator, the unsettled spectrum situation that can be used to optical system for testing of another output port of front end optical coupler, second port of front end circulator is connected with the signal input port of single-mode pumping beam combiner, the pumping input port of single-mode pumping beam combiner is connected with 980nm single-mode laser pumping source, the output port of single-mode pumping beam combiner is connected with one end of single mode Er-doped fiber, the other end of single mode Er-doped fiber is connected with front end faraday rotation mirror, 3rd port of front end circulator is connected with the input port of middle-end optical coupler, first output port of middle-end optical coupler is connected with the input port of middle-end optical isolator, the unsettled spectrum situation that can be used to optical system for testing of another output port of middle-end optical coupler, the output port of middle-end optical isolator is connected with the first port of rear end circulator, second port of rear end circulator is connected with the signal input port of multimode/double clad pump combiner, two input ports of the pumping of multimode/double clad pump combiner are connected with two 980 multi-mode laser pumping sources respectively, the output port of multimode/double clad pump combiner is connected with one end of double clad Er-doped fiber, the other end of double clad Er-doped fiber is connected with rear end faraday rotation mirror, 3rd port of rear end circulator is connected with the input port of rear end optical coupler, the output port of rear end optical coupler is connected with the input of rear end optical isolator, the unsettled spectrum situation that can be used to optical system for testing of another output port of rear end optical coupler, the output port of rear end optical isolator is signal output port.
2. the high-power L-wave-band erbium-doped fiber amplifier of all optical fibre structure as claimed in claim 1, is characterized in that above-mentioned syndeton all adopts fused fiber splice.
3. the high-power L-wave-band erbium-doped fiber amplifier of all optical fibre structure as claimed in claim 1, it is characterized in that the first delivery outlet of front end optical coupler is 99% output, the second delivery outlet is 1% delivery outlet.
4. the high-power L-wave-band erbium-doped fiber amplifier of all optical fibre structure as claimed in claim 1, it is characterized in that the first delivery outlet of middle-end optical coupler is 99% output, the second delivery outlet is 1% delivery outlet.
5. the high-power L-wave-band erbium-doped fiber amplifier of all optical fibre structure as claimed in claim 1, it is characterized in that the first delivery outlet of rear end optical coupler is 99% output, the second delivery outlet is 1% delivery outlet.
6. the high-power L-wave-band erbium-doped fiber amplifier of all optical fibre structure as claimed in claim 1, it is characterized in that front end faraday rotation mirror and rear end faraday rotation mirror play reflected light path, make the light path long enough through Er-doped fiber in light path, make that the gain of C-band is as much as possible is converted into L-band gain, and the form of circulator, coupler, fiber end face mirror or grating can be used to replace front end faraday rotation mirror and rear end faraday rotation mirror.
7. the high-power L-wave-band erbium-doped fiber amplifier of all optical fibre structure as claimed in claim 1, it is characterized in that single-mode pumping beam combiner is that conjunction bundle is carried out in single-mode laser pumping and flashlight, situation can be selected to determine the operation wavelength of the pumping end of 915nm or 980nm according to pumping; Multimode/double clad pump combiner is that conjunction bundle is carried out in multi-mode laser pumping and flashlight, situation can be selected to determine the operation wavelength of two pump ports of 915nm or 980nm according to pumping.
8. the high-power L-wave-band erbium-doped fiber amplifier of all optical fibre structure as claimed in claim 1, is characterized in that the pumping of 980nm single-mode laser is for carrying out energy supplement to Er-doped fiber wavelength convert, can replace with the single-mode laser pumping source of 915nm.
9. the high-power L-wave-band erbium-doped fiber amplifier of all optical fibre structure as claimed in claim 1, it is characterized in that 980nm multi-mode laser pumping source is for carrying out energy supplement to er-doped doubly clad optical fiber wavelength convert, can substitute with the multi-mode laser pumping source of 915nm, when pump light is greater than 10W time, powerful 980nm optical isolator is set between 980nm multi-mode laser pumping source and two pump ports of multimode/double clad pump combiner.
10. the high-power L-wave-band erbium-doped fiber amplifier of all optical fibre structure as claimed in claim 1, it is characterized in that L-band power output is greater than 2W, bandwidth of operation is 1570nm ~ 1620nm, 10nm more than common L-band amplifier, gain is on average greater than 23dB, 3dB larger than common L-band amplifier.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520785422.4U CN205081351U (en) | 2015-10-10 | 2015-10-10 | High -power L wave band erbium doped fiber amplifier of all optical fibre structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520785422.4U CN205081351U (en) | 2015-10-10 | 2015-10-10 | High -power L wave band erbium doped fiber amplifier of all optical fibre structure |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107453194A (en) * | 2017-09-18 | 2017-12-08 | 珠海光恒科技有限公司 | A kind of 1064 pumped great-power narrow linewidth C band erbium-doped fiber amplifiers |
| CN109103736A (en) * | 2018-10-31 | 2018-12-28 | 深圳技术大学（筹） | Infrared super-fluorescence light source in a kind of high power broad band full fibrillation |
| CN113131321A (en) * | 2021-04-12 | 2021-07-16 | 长春理工大学 | Low-threshold self-starting full-polarization-maintaining femtosecond fiber laser |
| WO2022068676A1 (en) * | 2020-09-30 | 2022-04-07 | 华为技术有限公司 | Optical fiber amplification apparatus |
-
2015
- 2015-10-10 CN CN201520785422.4U patent/CN205081351U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107453194A (en) * | 2017-09-18 | 2017-12-08 | 珠海光恒科技有限公司 | A kind of 1064 pumped great-power narrow linewidth C band erbium-doped fiber amplifiers |
| CN109103736A (en) * | 2018-10-31 | 2018-12-28 | 深圳技术大学（筹） | Infrared super-fluorescence light source in a kind of high power broad band full fibrillation |
| CN109103736B (en) * | 2018-10-31 | 2024-04-09 | 深圳技术大学 | High-power broadband full-optical fiber medium-infrared super-fluorescent light source |
| WO2022068676A1 (en) * | 2020-09-30 | 2022-04-07 | 华为技术有限公司 | Optical fiber amplification apparatus |
| CN113131321A (en) * | 2021-04-12 | 2021-07-16 | 长春理工大学 | Low-threshold self-starting full-polarization-maintaining femtosecond fiber laser |
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160309 |