CN104577678A - Random fiber laser based on random phase shifting fiber bragg gratings - Google Patents
Random fiber laser based on random phase shifting fiber bragg gratings Download PDFInfo
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- CN104577678A CN104577678A CN201510044147.5A CN201510044147A CN104577678A CN 104577678 A CN104577678 A CN 104577678A CN 201510044147 A CN201510044147 A CN 201510044147A CN 104577678 A CN104577678 A CN 104577678A
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Abstract
The invention discloses a random fiber laser based on random phase shifting fiber bragg gratings, and belongs to the technical field of fiber lasers. The random fiber laser based on the random phase shifting fiber bragg grating consists of a first random phase shifting fiber bragg grating, an erbium-doped fiber pumping laser source, a wavelength division multiplexer, an erbium-doped fiber and a second random phase shifting fiber bragg grating. Laser gain is separated from random feedback, the laser gain is provided by the erbium-doped fiber, the random feedback is provided by the first random phase shifting fiber bragg grating and the second random phase shifting fiber bragg grating, and laser oscillation is realized. The random fiber laser based on the random phase shifting fiber bragg gratings has the advantages of simple structure, easiness in manufacturing, low threshold value power and the like.
Description
Technical field
The present invention relates to a kind of random fiber laser, particularly relate to a kind of random fiber laser based on random phase shift fiber grating, belong to fiber laser technology field.
Background technology
Random fiber laser is a kind of Novel fiber laser just grown up in recent years, and it is structurally different from conventional laser, i.e. no-mirror, and the random feedback in optical fiber that feds back through of light realizes.Present most of random fiber laser realizes random distribution feedback based on Rayleigh scattering in optical fiber.Because the Rayleigh scattering in optical fiber is very weak, such random fiber laser often needs the optical fiber (tens kilometers) of long distance, and threshold power is high.In order to overcome the more weak problem of Rayleigh scattering in random fiber laser, people propose to inscribe fiber grating on rare earth-doped fiber, provide random feedback, thus shorten the distance of random feedback, reduce threshold power.But in order to obtain enough gains, the method needs to inscribe longer fiber grating (tens centimetres) on rare earth-doped fiber, and complex manufacturing technology, inscription is not easy.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, object of the present invention provides a kind of random fiber laser based on random phase shift fiber grating, and this laser has the features such as structure is simple, making is easy, threshold power is low.
The technical scheme that the present invention takes for technical solution problem is:
Based on a random fiber laser for random phase shift fiber grating, comprise the first random phase shift fiber grating (1), Er-doped fiber pump laser source (2), wavelength division multiplexer (3), Er-doped fiber (4), the second random phase shift fiber grating (5); One end of the first described random phase shift fiber grating (1) is connected with wavelength division multiplexer (3) Two-port netwerk 101, Er-doped fiber pump laser source (2) is connected with wavelength division multiplexer (3) Single port 100, wavelength division multiplexer (3) three port one 02 is connected with Er-doped fiber (4), and Er-doped fiber (4) is connected with the second random phase shift fiber grating (5).First random phase shift fiber grating (1) and the second random phase shift fiber grating (5) provide random feedback, and laser exports from first random phase shift fiber grating (1) other end.
The first described random phase shift fiber grating (1) is inscribed by monomode fiber or multimode fiber, and length is 0.5cm ~ 10cm, and reflectivity is 50% ~ 95%.
The second described random phase shift fiber grating (5) is inscribed by monomode fiber or multimode fiber, and length is 0.5cm ~ 10cm, and reflectivity is 90% ~ 99.9%.
Beneficial effect of the present invention:
1, adopt random phase shift fiber grating as random feedback, can reflectivity be improved, reduce threshold power;
2, laser gain being separated with feeding back at random, can inscribing random phase shift fiber grating on common optical fiber, the fiber grating length of required inscription is shorter, and technique is simpler.
Accompanying drawing explanation
Below in conjunction with accompanying drawing and embodiment, the invention will be further described.
Fig. 1 is the structural representation of a kind of random fiber laser based on random phase shift fiber grating of the present invention.
1 is the first random phase shift fiber grating; 2 is Er-doped fiber pump laser source; 3 is wavelength division multiplexer; 4 is Er-doped fiber; 5 is the second random phase shift fiber grating; 100 is wavelength division multiplexer Single port; 101 is wavelength division multiplexer Two-port netwerk; 102 is wavelength division multiplexer three port.
Concrete execution mode
Elaborate below in conjunction with structure of the present invention and operation principle:
In Fig. 1, a kind of random fiber laser based on random phase shift fiber grating, comprise the first random phase shift fiber grating (1), Er-doped fiber pump laser source (2), wavelength division multiplexer (3), Er-doped fiber (4), the second random phase shift fiber grating (5).One end of first random phase shift fiber grating (1) is connected with the Two-port netwerk 101 of wavelength division multiplexer (3), Er-doped fiber pump laser source (2) is connected with wavelength division multiplexer (3) Single port 100, and three port ones 02 of wavelength division multiplexer (3) are connected with one end of Er-doped fiber (4), and the other end of Er-doped fiber (4) is connected with the second random phase shift fiber grating (5).First random phase shift fiber grating (1) and the second random phase shift fiber grating (5) provide random feedback, and laser exports from first random phase shift fiber grating (1) other end.
A kind of operation principle of the random fiber laser based on random phase shift fiber grating:
After each parts of a kind of random fiber laser based on random phase shift fiber grating according to Fig. 1 connect.The pump light that Er-doped fiber pump laser source (2) sends is coupled in linear optical path by wavelength division multiplexer (3) Single port 100, and the Er3+ in Er-doped fiber (4) is energized into high level, Er
3+spontaneous emission light when second random phase shift fiber grating (5), realize feed back at random, feedback light wavelength is relevant with the centre wavelength of the second random phase shift fiber grating (5).Feedback light obtains optical signal amplification when Er-doped fiber (4), after wavelength division multiplexer (3), again realizes random feedback by the first random phase shift fiber grating (1).First random phase shift fiber grating (1) is identical with the centre wavelength of the second random phase shift fiber grating (5).When the pump power of Er-doped fiber pump laser source (2) is enough high, feedback light is oscillate between the first random phase shift fiber grating (1) and the second random phase shift fiber grating (5), and the Random Laser of acquisition is exported by first random phase shift fiber grating (1) other end.
Embodiment
Fig. 1 is the structural representation of a kind of random fiber laser based on random phase shift fiber grating of the present invention.Wherein the first random phase shift fiber grating (1) is inscribed by monomode fiber, and reflectivity is 90%, and length is 1cm, and centre wavelength is 1550nm.Er-doped fiber pump laser source (2) wavelength is 980nm, and wavelength division multiplexer (3) operation wavelength is 980nm/1550nm, and Er-doped fiber (4) length is 1m.Second random phase shift fiber grating (5) is inscribed by monomode fiber, and reflectivity is 99%, and length is 1cm, and centre wavelength is 1550nm.One end of first random phase shift fiber grating (1) connects the Two-port netwerk 101 of wavelength division multiplexer (3), Er-doped fiber pump laser source (2) is connected with wavelength division multiplexer (3) Single port 100, three port ones 02 of wavelength division multiplexer (3) are connected with one end of Er-doped fiber (4), and the other end of Er-doped fiber (4) is connected with the second random phase shift fiber grating (5).First random phase shift fiber grating (1) and the second random phase shift fiber grating (5) provide random feedback, and laser exports from first random phase shift fiber grating (1) other end.
Er-doped fiber pump laser source (2) exports the pump light of 980nm, is after the wavelength division multiplexer (3) of 980nm/1550nm, by the Er in Er-doped fiber (4) by operation wavelength
3+be energized into high level, Er
3+spontaneous emission light when second random phase shift fiber grating (5), realize feed back at random, feedback light wavelength is 1550nm.Feedback light obtains optical signal amplification when Er-doped fiber (4), and after wavelength division multiplexer (3), again realize random feedback by the first random phase shift fiber grating (1), feedback light wavelength is 1550nm.When the pump power of Er-doped fiber pump laser source (2) is enough high, feedback light is oscillate between the first random phase shift fiber grating (1) and the second random phase shift fiber grating (5), and the Random Laser of acquisition is exported by first random phase shift fiber grating (1) other end.
Above embodiment is one of preferred version in all schemes of the present invention, and other all belongs to the simple change of the multi-wavelength random fiber laser structure based on hybrid gain the scope that the present invention protects.
Claims (3)
1. the random fiber laser based on random phase shift fiber grating, it is characterized in that, comprise the first random phase shift fiber grating (1), Er-doped fiber pump laser source (2), wavelength division multiplexer (3), Er-doped fiber (4), the second random phase shift fiber grating (5); One end of the first described random phase shift fiber grating (1) is connected with wavelength division multiplexer (3) Two-port netwerk 101, Er-doped fiber pump laser source (2) is connected with wavelength division multiplexer (3) Single port 100, wavelength division multiplexer (3) three port one 02 is connected with Er-doped fiber (4), and Er-doped fiber (4) is connected with the second random phase shift fiber grating (5).First random phase shift fiber grating (1) and the second random phase shift fiber grating (5) provide random feedback, and laser exports from first random phase shift fiber grating (1) other end.
2. a kind of random fiber laser based on random phase shift fiber grating according to claim 1, it is characterized in that, the first described random phase shift fiber grating (1) is inscribed by monomode fiber or multimode fiber, and length is 0.5cm ~ 10cm, and reflectivity is 50% ~ 95%.
3. a kind of random fiber laser based on random phase shift fiber grating according to claim 1, it is characterized in that, the second described random phase shift fiber grating (5) is inscribed by monomode fiber or multimode fiber, and length is 0.5cm ~ 10cm, and reflectivity is 90% ~ 99.9%.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108565667A (en) * | 2018-03-27 | 2018-09-21 | 中国计量大学 | A kind of feedback-enhanced erbium-doped nonlinear fiber grating accidental laser |
| CN110048296A (en) * | 2019-05-24 | 2019-07-23 | 中国计量大学 | A kind of 3 μm of optical fiber lasers based on doped fluoride phase-shifted grating feedback |
| CN111106517A (en) * | 2019-12-26 | 2020-05-05 | 上海频准激光科技有限公司 | Erbium-doped fiber laser with same pump for random Raman fiber laser |
| CN113241576A (en) * | 2021-04-26 | 2021-08-10 | 广东工业大学 | 2-micron-band cylindrical vector optical fiber random laser based on optical fiber random grating |
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| CN102354900A (en) * | 2011-11-09 | 2012-02-15 | 中国计量学院 | Random-distribution feedback optical fiber laser |
| CN103378538A (en) * | 2012-04-17 | 2013-10-30 | 电子科技大学 | Semi-open cavity random fiber laser with low threshold |
| CN103825169A (en) * | 2014-03-03 | 2014-05-28 | 中国计量学院 | Fiber laser based on doped fiber random phase shift raster |
| CN204333588U (en) * | 2015-01-27 | 2015-05-13 | 中国计量学院 | A kind of random fiber laser based on random phase shift fiber grating |
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2015
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Patent Citations (4)
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| CN102354900A (en) * | 2011-11-09 | 2012-02-15 | 中国计量学院 | Random-distribution feedback optical fiber laser |
| CN103378538A (en) * | 2012-04-17 | 2013-10-30 | 电子科技大学 | Semi-open cavity random fiber laser with low threshold |
| CN103825169A (en) * | 2014-03-03 | 2014-05-28 | 中国计量学院 | Fiber laser based on doped fiber random phase shift raster |
| CN204333588U (en) * | 2015-01-27 | 2015-05-13 | 中国计量学院 | A kind of random fiber laser based on random phase shift fiber grating |
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| 袁俊伟等: "《基于弱反射FBG串的随机分布反馈掺铒光纤激光器》", 《光电子·激光》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108565667A (en) * | 2018-03-27 | 2018-09-21 | 中国计量大学 | A kind of feedback-enhanced erbium-doped nonlinear fiber grating accidental laser |
| CN110048296A (en) * | 2019-05-24 | 2019-07-23 | 中国计量大学 | A kind of 3 μm of optical fiber lasers based on doped fluoride phase-shifted grating feedback |
| CN111106517A (en) * | 2019-12-26 | 2020-05-05 | 上海频准激光科技有限公司 | Erbium-doped fiber laser with same pump for random Raman fiber laser |
| CN113241576A (en) * | 2021-04-26 | 2021-08-10 | 广东工业大学 | 2-micron-band cylindrical vector optical fiber random laser based on optical fiber random grating |
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