CN102946041A - Tunable single-polarization Brillouin erbium-doped optical fiber laser with super narrow linewidth - Google Patents
Tunable single-polarization Brillouin erbium-doped optical fiber laser with super narrow linewidth Download PDFInfo
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Abstract
A tunable single-polarization Brillouin erbium-doped optical fiber laser device with super narrow linewidth comprises a narrow linewidth pump laser, a three-port circulator, a wavelength division multiplexer, a section of erbium-doped optical fiber wound on a piezoelectric ceramic ring, an erbium-doped optical fiber pump light source and a narrow-band optical filter and an optical fiber coupler with a coupling mode of 2*2 or 1*2. The narrow linewidth pump laser is connected to a first port of the circulator through an optical fiber, a second port of the circulator is connected with a reflecting port of the wavelength division multiplexer through an optical fiber, the erbium-doped optical fiber pump light source is connected with a passband port of the wavelength division multiplexer through an optical fiber, a common port of the wavelength division multiplexer is connected with the erbium-doped optical fiber and then connected to a third port of the optical fiber coupler, a third port of the circulator is connected to a first port of the optical fiber coupler through the narrow linewidth pump laser, and a fourth port of the optical fiber coupler outputs laser. The tunable single-polarization Brillouin erbium-doped optical fiber laser device with the super narrow linewidth achieves output of tunable single-polarization Brillouin erbium-doped optical fiber laser with the super narrow linewidth.
Description
Technical field
The present invention relates to a kind of fiber laser, relate in particular to a kind of tunable single polarization super-narrow line width Brillouin erbium-doped fiber laser.
Background technology
The super-narrow line width fiber laser becomes an important development direction of present fiber laser with its distinctive low phase noise characteristic, is widely used in distributing optical fiber sensing and the interference-type optical fiber sensor-based system, to reduce noise, improves detection sensitivity.Present super-narrow line width fiber laser mainly contains two classes: Rear Earth Doped Fiber Laser and Brillouin optical fiber laser (BFL).
The method that realizes the narrow linewidth Rear Earth Doped Fiber Laser has compression chamber long, such as patent " the single polarization linear cavity of single-frequency is mixed the ytterbium laser " (patent publication No. CN 101355226A).This patent adopts Yb dosed optical fiber as gain media, and linear cavity length is 5cm only.But this kind method need to be carved grid at the inclined to one side Yb dosed optical fiber of guarantor, and is higher to technological requirement.Another kind method is the live width compress technique based on saturated absorbing body, such as patent " based on the tunable single-frequency single polarization optical fiber laser of polarization-maintaining fiber grating " (patent publication No. CN 101667710A).This patent adopts the high-birefringence polarisation-maintaining optical fiber grating as the frequency-selecting element, the Er-doped fiber of pumping is not as saturated absorbing body, change polarization state by light polarization modulator and choose the polarization-maintaining fiber grating reflection wavelength, obtain the single polarization erbium doped fiber laser of narrow line width regulatable single-frequency of 1552nm.But the method is united the Er-doped fiber and the light polarization modulator formation wavelength tuning device that use polarization-maintaining fiber grating, not pumping and is caused laser structure complicated, and it is constant to regulate control.And saturated absorbing body has increased the chamber damage, and fiber grating Yi Fashengwen floats, and this causes again the unsteadiness of laser.
Brillouin erbium-doped fiber laser (BEFL), (~ 10mW) characteristic is a kind of novel super-narrow line width fiber optic laser source to combine BFL narrow linewidth and erbium doped fiber laser (EDFL) high power.Because BEFL itself utilizes arrowband stimulated Brillouin scattering (SBS) gain starting of oscillation, so it does not need the technology such as similar unsaturated absorber or narrow band filter to carry out the live width compression.The chamber length how research compresses BEFL is to realize the key issue of single-frequency BEFL output.Patent " a kind of single-frequency super-narrow line width Brillouin erbium-doped fiber laser " (patent publication No. 102361210A) provide a kind of single-frequency BEFL based on the pre-amplifying technique of Brillouin's pumping, adopt length less than the monomode fiber of 10m, the increase longitudinal mode spacing (~ 10MHz), so that only have a zlasing mode in the brillouin gain spectrum, and then realize stable single-frequency BEFL output.This BEFL and traditional B EFL are similar, and its brillouin gain medium and EDFA gain media are discrete, and namely passive fiber provides brillouin gain, and Active Optical Fiber only provides the EDFA gain, so needs all the time one section passive fiber in the chamber.Document " ultrashort annular chamber Brillouin erbium-doped fiber laser " (Chinese laser, 2012,39(7): 0702010-1) utilize the 4m Er-doped fiber not only to be used as the brillouin gain medium but also provide linear Er-doped fiber to amplify, realize ultrashort annular chamber BEFL single longitudinal mode output.But owing to adopt monomode fiber, so the output polarization state change at random of laser, and in the application of reality, such as the interfere type sensing, require light signal to have stable polarization state.And in many applications such as distributing optical fiber sensings, require light source to have tunability.Have not yet to see the report of tunable single polarization super-narrow line width BEFL.
Summary of the invention
Defective for prior art exists the objective of the invention is to propose a kind of tunable single polarization super-narrow line width Brillouin erbium-doped fiber laser, is intended to realize tunable single polarization super-narrow line width BEFL output.
Technical scheme of the present invention is:
A kind of tunable single polarization super-narrow line width Brillouin erbium-doped fiber laser, it is characterized in that, comprise the narrow linewidth pump laser, circulator, wavelength division multiplexer, one section Er-doped fiber that is wrapped on the piezoelectric ceramic ring, the Er-doped fiber pump light source, narrow-band optical filter and coupled modes are 2 * 2 or 1 * 2 fiber coupler, described circulator is for being provided with the first port, three port circulators of the second port and the 3rd port, described narrow linewidth pump laser is connected to the first port of circulator by optical fiber, the second port of described circulator connects the reflector port of wavelength division multiplexer by optical fiber, described Er-doped fiber pump light source connects the passband port of wavelength division multiplexer by optical fiber, be connected to again the 3rd port of fiber coupler behind the public port connection Er-doped fiber of wavelength division multiplexer, the 3rd port of described circulator is connected to the first port of fiber coupler, the 4th port Output of laser of fiber coupler by narrow-band optical filter.Er-doped fiber of the present invention provides brillouin gain and erbium ion gain simultaneously, has realized producing higher excited Brillouin gain in than short fiber, and then has realized the ultrashort annular chamber single-frequency of higher-wattage Brillouin erbium-doped fiber laser.Piezoelectric ceramic ring is used for the chamber length of modulated laser and the Brillouin shift of Er-doped fiber, to realize tunable laser output.
Preferably, the circulator of described narrow linewidth pump laser, three ports, wavelength division multiplexer, one section Er-doped fiber, Er-doped fiber pump light source, narrow-band optical filter and coupled modes that are wrapped on the piezoelectric ceramic ring are that 2 * 2 or 1 * 2 fiber coupler is the inclined to one side device of all risk insurance.Another technical scheme is: the circulator of described narrow linewidth pump laser, three ports, wavelength division multiplexer, one section Er-doped fiber, Er-doped fiber pump light source, narrow-band optical filter and coupled modes that are wrapped on the piezoelectric ceramic ring are that 2 * 2 or 1 * 2 fiber coupler is single mode device, and introduce a polarizer in the resonant cavity of laser.By using the inclined to one side device of all risk insurance or introducing a polarizer as single mode device but in the chamber and realize single polarization laser output.Wherein: no matter described Er-doped fiber pump light source is to protect inclined to one side device or single mode device, its on the polarization state of laser all without impact, therefore the circulator of described narrow linewidth pump laser, three ports, wavelength division multiplexer, one section Er-doped fiber, narrow-band optical filter and coupled modes that are wrapped on the piezoelectric ceramic ring are that 2 * 2 or 1 * 2 fiber coupler is the inclined to one side device of all risk insurance, the Er-doped fiber pump light source is single mode device, and this scheme also can; The circulator of same described narrow linewidth pump laser, three ports, wavelength division multiplexer, one section Er-doped fiber, narrow-band optical filter and coupled modes that are wrapped on the piezoelectric ceramic ring are that 2 * 2 or 1 * 2 fiber coupler is single mode device, and in the resonant cavity of laser, introduce a polarizer, the Er-doped fiber pump light source is for protecting inclined to one side device, and this scheme also can.
Preferably, the Brillouin shift of the chamber of described piezoelectric ceramic ring modulated laser length and Er-doped fiber.
Preferably, the brillouin gain spectrum width of described Er-doped fiber is that the live width of narrow linewidth pump laser is more than 10 times.
Preferably, described narrow linewidth pump laser is semiconductor laser or fiber laser, and the wavelength of narrow linewidth pump laser is positioned at C-band.
Preferably, described Er-doped fiber is the bismuth co-doped optical fiber of common Er-doped fiber, erbium-ytterbium co-doped fiber or erbium, and the length of described Er-doped fiber is greater than 0 meter and less than 10 meters.
Preferably, the pump mode of described Er-doped fiber is single forward pumping, single backward pump or two directional pump.
Preferably, described Er-doped fiber pump light source is the semiconductor laser of 980nm or the semiconductor laser of 1480nm.
Preferably, the consistent wavelength of the centre wavelength of described narrow-band optical filter and narrow linewidth pump laser.The bandwidth of narrow-band optical filter should be as the criterion with the backward Brillouin scattering optical wavelength that can cover in the monomode fiber, and more narrow better.
Described Er-doped fiber among the present invention, its characteristic parameter, such as refractive index, length, doping content etc., can be actual selected according to using.
Described fiber coupler among the present invention is 2 * 2 or 1 * 2 coupled modes, and its splitting ratio should be determined according to practical application.
Useful technique effect of the present invention is:
Tunable single polarization super-narrow line width Brillouin erbium-doped fiber laser provided by the invention, owing to only use Active Optical Fiber that two kinds of gains are provided, so that need not in resonant cavity, to introduce the passive fiber that brillouin gain is provided, suppress the interior self-excitation pattern of resonant cavity owing to introduce narrow-band optical filter simultaneously, so that adopt several meters common Er-doped fiber can form stable BEFL, realized the single-frequency output of Ultrashort cavity structure.Regulate fiber lengths and the Er-doped fiber stress application is changed the Brillouin shift of erbium fibre owing in the chamber, introduce piezoelectric ceramic ring (being PZT), realized the tunable of Output of laser frequency.Because the optics that adopts all is optics of the inclined to one side structure of all risk insurance or employing to be single mode device but to introduce a polarizer in resonant cavity, has realized so stable single polarization state laser.
Description of drawings
Fig. 1 is structural representation of the present invention.
Wherein: 1 is the narrow linewidth pump laser, 2 is circulator, 3 is wavelength division multiplexer, 4 is the Er-doped fiber pump light source, and 5 is Er-doped fiber, and 6 is piezoelectric ceramic ring, 7 is narrow-band optical filter, 8 is fiber coupler, and 21 is circulator the first port, and 22 is circulator the second port, 23 is circulator the 3rd port, 31 is the reflector port of wavelength division multiplexer, and 32 is the passband port of wavelength division multiplexer, and 33 is the public port of wavelength division multiplexer, 81 is coupler the first port, 82 is coupler the second port, and 83 is coupler the 3rd port, and 84 is coupler the 4th port.
The realization of the object of the invention, functional characteristics and advantage are described further with reference to accompanying drawing in connection with embodiment.
Embodiment
Should be appreciated that specific embodiment described herein only in order to explain the present invention, is not intended to limit the present invention.
The present invention proposes a kind of tunable single polarization super-narrow line width Brillouin erbium-doped fiber laser, its circulator 2 by narrow linewidth pump laser 1, three ports, wavelength division multiplexer 3, Er-doped fiber pumping source 4, Er-doped fiber 5, piezoelectric ceramic ring 6, narrow-band optical filter 7 and coupled modes are 2 * 2(or 1 * 2) fiber coupler 8 form.Described circulator 2 is for being provided with the first port 21, three port circulators of the second port 22 and the 3rd port 23, described narrow linewidth pump laser 1 is connected to the first port 21 of circulator 2 by optical fiber, the second port 22 of described circulator 2 connects the reflector port 31 of wavelength division multiplexer 3 by optical fiber, described Er-doped fiber pump light source 4 connects the passband port 32 of wavelength division multiplexer 3 by optical fiber, be connected to again the 3rd port 83 of fiber coupler 8 behind the public port 33 connection Er-doped fibers 5 of wavelength division multiplexer 3, the 3rd port 23 of described circulator 2 is connected to the first port 81 of fiber coupler 8, the 4th port 84 Output of lasers of fiber coupler 8 by narrow-band optical filter 7.
Operation principle of the present invention is as follows: the output light beam of narrow linewidth pump laser 1 enters the first port 21 of circulator 2, again through the second port 22, the public port 33 that is entered wavelength division multiplexer by the reflector port 31 of wavelength division multiplexer injects the Er-doped fiber 5 that is wrapped on the piezoelectric ceramic ring 6, and the simultaneously output of Er-doped fiber pump light source 4 is injected Er-doped fibers 5 by the public port 33 that the passband port 32 of wavelength division multiplexer enters wavelength division multiplexer.The narrow linewidth pump laser that enters Er-doped fiber 5 after Er-doped fiber 5 excites SBS to produce to Stokes light, SBS occurs with the effect of Brillouin's pump light and amplifies in Stokes light when Er-doped fiber 5 transmission, simultaneously and the effect of Er-doped fiber pump light linear amplification occurs.Stokes light by two kinds of amplifications of Er-doped fiber 5 experience enters narrow-band optical filter 7 through circulator 2.Narrow-band optical filter centre wavelength is positioned at Brillouin's pumping wave strong point and bandwidth covers the Stokes wavelength, and its effect is the spontaneous emission noise of being excited outside the filtering bandwidth, suppresses self-excitation mode oscillation in the resonant cavity.The Stokes light that is positioned at the narrow-band optical filter bandwidth passes through narrow-band optical filter 7 by fiber coupler 8 beam splitting, outside a branch of the second port export cavity by fiber coupler 8, another bundle continues to enter circulation amplify vibration in the chamber by the 3rd port of fiber coupler 8.The BEFL laser of final output is via the 4th port output of fiber coupler 8.
Be wrapped in the length of voltage control Er-doped fiber 5 of the piezoelectric ceramic ring 6 on the Er-doped fiber 5 and suffered stress by control, and then the long Brillouin shift with gain media in the chamber of control fiber laser, finally realize the tuning of Output of laser wavelength.
Each optical element of the present invention is the inclined to one side device of all risk insurance, adopts the inclined to one side heat sealing machine of guarantor to carry out 0 ° of angle welding between each device.Perhaps each optical element is single mode device and introduces a polarizer in the chamber, uses the welding of single mode heat sealing machine between each device.This two schemes all can be realized the BEFL output of single polarization.
The above only is the preferred embodiments of the present invention; be not so limit claim of the present invention; every equivalent structure transformation that utilizes specification of the present invention and accompanying drawing content to do; or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the present invention.This invention is intended to contain the various modification in the spirit and scope of appended claims, realize the tuning etc. of laser frequency as substituting piezoelectric ceramic ring with attemperating unit.
Claims (10)
1. tunable single polarization super-narrow line width Brillouin erbium-doped fiber laser, it is characterized in that, comprise the narrow linewidth pump laser, circulator, wavelength division multiplexer, one section Er-doped fiber that is wrapped on the piezoelectric ceramic ring, the Er-doped fiber pump light source, narrow-band optical filter and coupled modes are 2 * 2 or 1 * 2 fiber coupler, described circulator is for being provided with the first port, three port circulators of the second port and the 3rd port, described narrow linewidth pump laser is connected to the first port of circulator by optical fiber, the second port of described circulator connects the reflector port of wavelength division multiplexer by optical fiber, described Er-doped fiber pump light source connects the passband port of wavelength division multiplexer by optical fiber, be connected to again the 3rd port of fiber coupler behind the public port connection Er-doped fiber of wavelength division multiplexer, the 3rd port of described circulator is connected to the first port of fiber coupler, the 4th port Output of laser of fiber coupler by narrow-band optical filter.
2. tunable single polarization super-narrow line width Brillouin erbium-doped fiber laser according to claim 1, it is characterized in that the circulator of described narrow linewidth pump laser, three ports, wavelength division multiplexer, one section Er-doped fiber, Er-doped fiber pump light source, narrow-band optical filter and coupled modes that are wrapped on the piezoelectric ceramic ring are that 2 * 2 or 1 * 2 fiber coupler is the inclined to one side device of all risk insurance.
3. tunable single polarization super-narrow line width Brillouin erbium-doped fiber laser according to claim 1, it is characterized in that, the circulator of described narrow linewidth pump laser, three ports, wavelength division multiplexer, one section Er-doped fiber, Er-doped fiber pump light source, narrow-band optical filter and coupled modes that are wrapped on the piezoelectric ceramic ring are that 2 * 2 or 1 * 2 fiber coupler is single mode device, and introduce a polarizer in the resonant cavity of laser.
4. according to claim 1,2 or 3 described tunable single polarization super-narrow line width Brillouin erbium-doped fiber lasers, it is characterized in that the Brillouin shift of the long and Er-doped fiber in the chamber of described piezoelectric ceramic ring modulated laser.
5. tunable single polarization super-narrow line width Brillouin erbium-doped fiber laser according to claim 4 is characterized in that, the brillouin gain spectrum width of described Er-doped fiber is that the live width of narrow linewidth pump laser is more than 10 times.
6. tunable single polarization super-narrow line width Brillouin erbium-doped fiber laser according to claim 4 is characterized in that, described narrow linewidth pump laser is semiconductor laser or fiber laser, and the wavelength of narrow linewidth pump laser is positioned at C-band.
7. a kind of tunable single polarization super-narrow line width Brillouin erbium-doped fiber laser according to claim 4, it is characterized in that, described Er-doped fiber is the bismuth co-doped optical fiber of common Er-doped fiber, erbium-ytterbium co-doped fiber or erbium, and the length of described Er-doped fiber is greater than 0 meter and less than 10 meters.
8. a kind of tunable single polarization super-narrow line width Brillouin erbium-doped fiber laser according to claim 4 is characterized in that, the pump mode of described Er-doped fiber is single forward pumping, single backward pump or two directional pump.
9. a kind of tunable single polarization super-narrow line width Brillouin erbium-doped fiber laser according to claim 4 is characterized in that, described Er-doped fiber pump light source is the semiconductor laser of 980nm or the semiconductor laser of 1480nm.
10. a kind of tunable single polarization super-narrow line width Brillouin erbium-doped fiber laser according to claim 4 is characterized in that the consistent wavelength of the centre wavelength of described narrow-band optical filter and narrow linewidth pump laser.
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| CN103326221A (en) * | 2013-06-25 | 2013-09-25 | 上海朗研光电科技有限公司 | Method for reinforcing frequency doubling luminous efficacy by utilizing annular optical fiber active cavity resonance |
| CN103337778A (en) * | 2013-03-08 | 2013-10-02 | 华南理工大学 | Frequency modulating single frequency fiber laser |
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| CN104617472A (en) * | 2015-02-02 | 2015-05-13 | 中国人民解放军国防科学技术大学 | Brillouin multi-wavelength erbium-doped fiber laser with ultra-narrow linewidth |
| CN106410599A (en) * | 2016-10-31 | 2017-02-15 | 华南理工大学 | Brillouin single-longitudinal-mode frequency-shift fiber laser |
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| CN111600185A (en) * | 2020-06-05 | 2020-08-28 | 中国科学院半导体研究所 | Dual-polarization optical fiber amplifier |
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| CN115395359A (en) * | 2022-10-28 | 2022-11-25 | 中国航天三江集团有限公司 | Method and device for inhibiting SBS (styrene-butadiene-styrene) effect of optical fiber |
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| CN112736638B (en) * | 2021-01-14 | 2024-04-26 | 北京工业大学 | Full-optical-fiber narrow linewidth nanosecond tunable green laser |
| CN115395359A (en) * | 2022-10-28 | 2022-11-25 | 中国航天三江集团有限公司 | Method and device for inhibiting SBS (styrene-butadiene-styrene) effect of optical fiber |
| CN115395359B (en) * | 2022-10-28 | 2023-03-10 | 中国航天三江集团有限公司 | Method and device for inhibiting optical fiber SBS (styrene butadiene styrene) effect |
| CN117578173A (en) * | 2023-10-27 | 2024-02-20 | 北京大学长三角光电科学研究院 | Full polarization-maintaining O-shaped ultrashort pulse mode-locked fiber laser |
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