CN208111909U - Random fiber laser based on Sagnac ring and opposite chirped fiber grating string - Google Patents
Random fiber laser based on Sagnac ring and opposite chirped fiber grating string Download PDFInfo
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- CN208111909U CN208111909U CN201820055578.0U CN201820055578U CN208111909U CN 208111909 U CN208111909 U CN 208111909U CN 201820055578 U CN201820055578 U CN 201820055578U CN 208111909 U CN208111909 U CN 208111909U
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Abstract
The utility model discloses a kind of random fiber laser based on Sagnac ring and opposite chirped fiber grating string, including pump laser, 980/1550nm wavelength division multiplexer, Y type coupler, polarization maintaining optical fibre, Polarization Controller, weak reflection chirp erbium-doped nonlinear fiber grating string, 980/1550nm wavelength division multiplexer, spectrometer and light power meter.The utility model provides random distribution feedback using the chirped fiber grating string being scribed on erbium-doped fiber, using Er-doped fiber as gain media.The distance of each chirped fiber grating random distribution between 30-100mm in the chirp erbium-doped nonlinear fiber grating string that the utility model uses.The chirp of two neighboring chirped fiber grating is contrary, increases the randomness of feedback.By adjusting Polarization Controller, the changeable stable output of wavelength is realized.The features such as random fiber laser described in the utility model has tunable wave length range wide, and stability is good, has huge application potential in the fields such as Fibre Optical Sensor and optic communication.
Description
Technical field
The invention belongs to field of laser device technology, and in particular to one kind is based on Sagnac ring and opposite chirped fiber grating string
Random fiber laser.
Background technique
Random fiber laser is that a kind of scattering light based in Disordered Media is constantly amplified by gain in transmission process
Novel no cavity configuration laser, there is outstanding advantages of structure simple, high conversion efficiency, nonlinear optics, light sensing with
The multiple fields such as optic communication, biomedical imaging, remote sensing are worth with major application.
2010, the distributed Rayleigh scatter-type optical fiber random laser using Ramam effect as gain mechanism was reported for the first time
Device, and its basic functional principle is illustrated, the new direction of random fiber laser research is thus opened, lasting open has been driven
Hair and application study.Therefore, in optical fiber laser field, Rayleigh scattering caused by the Intrinsic Disorder in optical fiber and drawing are utilized
Graceful scattering effect becomes the mainstream of current research and development as the mechanism for generating chance phenomenon.But due to caused by optical fiber
Very weak etc. reasons of Rayleigh scattering result in this kind of optical fiber laser with the deficiencies such as high threshold low power conversion efficiency is low.
1913, Sagnac effect was found for the first time and is verified by experiment, on the basis of this effect, polarization-maintaining is added
Optical fiber and Polarization Controller may make up filter.Its filtering characteristic compares other filtering devices, have structure simple, flexible adjustment,
The features such as comb filtering.
Chirped fiber grating is a kind of important optical element, since different stop positions corresponds to different back waves
Long, chirped fiber grating can form the very big reflected range of bandwidth.Chirped fiber grating string is applied to random optical-fiber laser
The Rayleigh scattering in optical fiber is replaced in device, distributed feed-back is provided, fiber lengths can be significantly saved, and improves turning for laser
Change efficiency and output power.
Summary of the invention
The invention proposes a kind of random fiber laser based on Sagnac ring and opposite chirped fiber grating string, is mixing
Inscribed on erbium optical fiber two neighboring chirped fiber grating chirp is contrary and chirped fiber grating string that spacing is random, laser
It is constantly realized to stablize by the Polarization Controller adjusted in Sagnac ring and be swashed by gain feedback in chirp erbium-doped nonlinear fiber grating string
The output of light.
The technical solution adopted for solving the technical problem of the present invention is as follows：
Random fiber laser based on Sagnac ring and opposite chirped fiber grating string, it is characterised in that by pumping laser
Device 1, the first 980/1550nm wavelength division multiplexer 2, Y type coupler 3, polarization maintaining optical fibre 4, Polarization Controller 5, weak reflection chirp are mixed
Erbium fiber grating string 6, the 2nd 980/1550nm wavelength division multiplexer 7, spectrometer and light power meter 8 form；Pump laser 1 and
The end 980nm of one 980/1550nm wavelength division multiplexer 2 is connected, and the common end of the first 980/1550nm wavelength division multiplexer 2 connects Y
Type coupler 3, the other end of Y type coupler is separately connected polarization maintaining optical fibre 4 and Polarization Controller 5 forms closed end；One 980/
The end 1550nm of 1550nm wavelength division multiplexer 2 connects weak reflection chirp erbium-doped nonlinear fiber grating string 6, weak reflection chirp Er-doped fiber light
The other end of grid string 6 connects the end 1550nm of the 2nd 980/1550nm wavelength division multiplexer 7, the 2nd 980/1550nm wavelength division multiplexer
7 common end connection spectrometer and light power meter 8；Wherein, two neighboring in the weak reflection chirp erbium-doped nonlinear fiber grating string 6
The chirp of chirped fiber grating is contrary, the spacing random distribution of each chirped fiber grating.
The further random optical fiber according to the present invention based on Sagnac ring and opposite chirped fiber grating string swashs
Light device, which is characterized in that the chirped fiber grating quantity of the weak reflection chirp erbium-doped nonlinear fiber grating string 6 is 30-50, each chirp
The bandwidth range of fiber grating is 1-10nm, the reflectivity of each chirped fiber grating 1%-10% and central wavelength it is consistent.
The operation principle of the present invention is that：
Pump laser 1 is opened, pump light is coupled into linear cavity by the first 980/1550nm wavelength division multiplexer 2,
In weak reflection chirp erbium-doped nonlinear fiber grating string 6, after Er3+ absorbs pump energy, from ground state transition to high level state, and with nothing
Radiation mode transits to metastable energy level, and Er3+ constantly absorbs pump energy to be assembled in upper energy level, final grain between realizing energy level
Subnumber reversion carries out gain of light amplification to the light of C-band to generate stimulated radiation.Simultaneously as weak reflection chirp er-doped light
Anderson localization phenomenon in fine grating string 6 so that light occur in weak reflection chirp erbium-doped nonlinear fiber grating string 6 repeatedly it is anti-
It penetrates, generates the closed annular chamber for being similar to resonant cavity, light is constantly amplified by gain in weak reflection string.Due to two neighboring chirp
The chirp of fiber grating is contrary and the spacing random distribution of each chirped fiber grating.Therefore, when intracavitary gain is greater than damage
Time-consuming generates Random Laser.By adjusting the Polarization Controller 5 in Sagnac ring, realize that the selectivity of wavelength stablizes output.
The present invention has the advantages that following innovation：
Chirped fiber grating string that the present invention uses is inscribed on Er-doped fiber and providing distributed Feedback, with traditional benefit
Distributed feed-back is provided with Rayleigh scattering to compare, and the use length of optical fiber is greatly reduced, effectively raises the output of laser
Efficiency reduces the output threshold value of laser.The chirped fiber grating that the present invention uses is compared with bragg grating, chirp
Fiber grating bandwidth is big, increases the selectable range of the Random Laser of generation；Due to phase in the chirped fiber grating string of inscription
The chirp of adjacent two chirped fiber gratings is contrary, substantially increases the randomness of feedback.The present invention is in random optical-fiber laser
Sagnac ring is added in device, by adjusting Polarization Controller 5, it can be achieved that Single wavelength, dual wavelength and stablizing for multi-wavelength export.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the random fiber laser based on Sagnac ring and opposite chirped fiber grating string.
Specific embodiment
Present invention is further described in detail with reference to the accompanying drawings and detailed description, but not limited to this.
A kind of random fiber laser based on Sagnac ring and opposite chirped fiber grating string, structural schematic diagram is as schemed
Shown in 1, including pump laser 1, the first 980/1550nm wavelength division multiplexer 2, Y type coupler 3, polarization maintaining optical fibre 4, Polarization Control
Device 5, weak reflection chirp erbium-doped nonlinear fiber grating string 6, the 2nd 980/1550nm wavelength division multiplexer 7, spectrometer and light power meter 8,
It is characterized in that pump laser 1 and the end 980nm of the first 980/1550nm wavelength division multiplexer 2 are connected, the first 980/1550nm wave
The common end of division multiplexer 2 connects Y type coupler 3, and the other end of Y type coupler is separately connected polarization maintaining optical fibre 4 and Polarization Control
Device 5 forms closed end；The end 1550nm of first 980/1550nm wavelength division multiplexer 2 connects weak reflection chirp erbium-doped nonlinear fiber grating
The other end of string 6, weak reflection chirp erbium-doped nonlinear fiber grating string 6 connects the 1550nm of the 2nd 980/1550nm wavelength division multiplexer 7
End, the common end connection spectrometer and light power meter 8 of the 2nd 980/1550nm wavelength division multiplexer 7, detects laser with this respectively
Spectrum and power out-put characteristic.
Weak reflection chirp erbium-doped nonlinear fiber grating string 6 of the present invention, chirped fiber grating quantity are 30-50, each chirped light
The bandwidth of fine grating is 1-5nm, and the reflectivity of each chirped fiber grating is 1%-10% and central wavelength is consistent, each chirp
The spacing random distribution of fiber grating；Two neighboring chirped fiber grating in the weak reflection chirp erbium-doped nonlinear fiber grating string 6
Chirp is contrary, to increase the randomness of feedback.
The scribing process of weak reflection chirp erbium-doped nonlinear fiber grating string 6 of the present invention：First treat inscribe Er-doped fiber into
Row carries hydrogen technical treatment, and phase mask plate is recycled continuously to be inscribed under laser.It needs constantly to change in scribing process
The front-rear direction of changeable phases mask plate, the chirp to realize two neighboring chirped fiber grating are contrary.
Claims (2)
1. the random fiber laser based on Sagnac ring and opposite chirped fiber grating string, it is characterised in that by pump laser
(1), the first 980/1550nm wavelength division multiplexer (2), Y type coupler (3), polarization maintaining optical fibre (4), Polarization Controller (5), weak reflection
Chirp erbium-doped nonlinear fiber grating string (6), the 2nd 980/1550nm wavelength division multiplexer (7), spectrometer and light power meter (8) composition；Pump
Pu laser (1) is connected with the end 980nm of the first 980/1550nm wavelength division multiplexer (2), the first 980/1550nm wavelength-division multiplex
The common end of device (2) connects Y type coupler (3), and the other end of Y type coupler is separately connected polarization maintaining optical fibre (4) and Polarization Control
Device (5) forms closed end；The end 1550nm of first 980/1550nm wavelength division multiplexer (2) connects weak reflection chirp Er-doped fiber light
The other end of grid string (6), weak reflection chirp erbium-doped nonlinear fiber grating string (6) connects the 2nd 980/1550nm wavelength division multiplexer (7)
The end 1550nm, the common end connection spectrometer and light power meter (8) of the 2nd 980/1550nm wavelength division multiplexer (7)；Wherein, described
Weak reflection chirp erbium-doped nonlinear fiber grating string (6) in two neighboring chirped fiber grating chirp it is contrary, each chirped fiber
The spacing random distribution of grating.
2. the random fiber laser according to claim 1 based on Sagnac ring and opposite chirped fiber grating string,
It is characterized in that, the chirped fiber grating quantity of weak reflection chirp erbium-doped nonlinear fiber grating string (6) is 30-50, each chirped fiber
The bandwidth range of grating is 1-10nm, the reflectivity of each chirped fiber grating 1%-10% and central wavelength it is consistent.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201820055578.0U CN208111909U (en) | 2018-01-12 | 2018-01-12 | Random fiber laser based on Sagnac ring and opposite chirped fiber grating string |
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| CN201820055578.0U CN208111909U (en) | 2018-01-12 | 2018-01-12 | Random fiber laser based on Sagnac ring and opposite chirped fiber grating string |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111244735A (en) * | 2020-01-16 | 2020-06-05 | 广东工业大学 | Annular narrow-band fiber grating random laser and method for generating random laser |
| CN112826424A (en) * | 2021-02-25 | 2021-05-25 | 嘉兴学院 | Medical endoscope structure with posture sensing function and using method thereof |
| CN113064233A (en) * | 2021-03-23 | 2021-07-02 | 武汉烽理光电技术有限公司 | Method and system for eliminating large-capacity grating array ghost |
| CN114204387A (en) * | 2021-11-08 | 2022-03-18 | 深圳大学 | Broadband tunable mid-infrared optical fiber random laser |
-
2018
- 2018-01-12 CN CN201820055578.0U patent/CN208111909U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111244735A (en) * | 2020-01-16 | 2020-06-05 | 广东工业大学 | Annular narrow-band fiber grating random laser and method for generating random laser |
| CN112826424A (en) * | 2021-02-25 | 2021-05-25 | 嘉兴学院 | Medical endoscope structure with posture sensing function and using method thereof |
| CN113064233A (en) * | 2021-03-23 | 2021-07-02 | 武汉烽理光电技术有限公司 | Method and system for eliminating large-capacity grating array ghost |
| CN114204387A (en) * | 2021-11-08 | 2022-03-18 | 深圳大学 | Broadband tunable mid-infrared optical fiber random laser |
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Granted publication date: 20181116 Termination date: 20200112 |