CN1556561A - Wave length tunable narrow wire width, high signal noise ratio single polarization ring cavity full optical fiber laser - Google Patents
Wave length tunable narrow wire width, high signal noise ratio single polarization ring cavity full optical fiber laser Download PDFInfo
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- CN1556561A CN1556561A CNA2003101220250A CN200310122025A CN1556561A CN 1556561 A CN1556561 A CN 1556561A CN A2003101220250 A CNA2003101220250 A CN A2003101220250A CN 200310122025 A CN200310122025 A CN 200310122025A CN 1556561 A CN1556561 A CN 1556561A
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Abstract
The invention relates to a full fiber laser, especially relates to a ring cavity full fiber laser with a adjustable wavelength, narrow line width, high signal-to-noise ratio and single-polarization output character, which can be uses as light source, widely applied to fiber communication and fiber sensing technology field. The laser mainly includes: semiconductor laser, wave division duplexer, the outputted laser is emitted to the erbium-doped fiber through the wave division duplexer, then it is transmitted to the fiber isolator, fiber polarization device, and it is connected to one port in the coupler cavity, another port is connected to the fiber isolating device, and connected to the wave division duplexer through another port of the fiber isolator, forms a ring cavity structure; out of the fiber coupler, one port is connected to the Bragg fiber gratings, the other port is connected to the output ports of the laser. The invention can acquire laser output with narrow line width, single-polarization laser, the line width can be less than 1GHz, and namely, the line width at 1550nm waveband is less than 0.008nm.
Description
Technical field
The present invention relates to a kind of full-optical-fiber laser, particularly relate to a kind of annular chamber full-optical-fiber laser with tunable wave length, narrow linewidth, high s/n ratio list polarization output characteristic, can be used as the perfect light source of optical fiber telecommunications system, also can be used as the important light source in optical fiber and the optical fiber grating sensing testing system, can be widely used in optical fiber communication and technical field of optical fiber sensing.
Background technology
Fiber grating is to be a kind of novel photonic device of information with the output light wavelength.Succeeding in developing of fiber grating effectively promoted the development of fiber laser.Fiber laser is the Primary Component in high speed, the high Capacity Communication System, its broad gain bandwidth, laser work wavelength are in the distinct advantages of optical communication 1550nm low-loss band just, particularly the annular chamber erbium doped fiber laser with tunable wave length, narrow linewidth, high s/n ratio list polarization characteristic of the present invention's acquisition has become the another kind of important selection light source of optical communication system after semiconductor laser, and becomes a big focus in Laser Study field.Result for retrieval shows, has not yet to see a kind of annular chamber full-optical-fiber laser that possesses tunable wave length, narrow linewidth, high s/n ratio list polarization simultaneously.
Summary of the invention
Purpose of the present invention is intended to design a kind of annular chamber er-doped full-optical-fiber laser with tunable wave length, narrow linewidth, high s/n ratio list polarization characteristic.This laser both can be used as the perfect light source of optical fiber telecommunications system, also can be used as the important light source in optical fiber and the optical fiber grating sensing testing system.Its technical scheme is: this tunable wave length, narrow linewidth, high s/n ratio list polarization annular chamber full-optical-fiber laser, it comprises: semiconductor laser LD1, wavelength division multiplexer WDM2, Er-doped fiber EDF3, fibre optic isolater PI-ISO (4,5), fibre optic polarizer PR6, fiber coupler Coupler7, bragg grating FBG8 and laser output 9, export to wavelength division multiplexer from the laser of semiconductor laser output, incide Er-doped fiber, be transferred to fibre optic isolater 4 more successively, fibre optic polarizer, be connected with a port of inboard, fiber coupler chamber, another port is connected with fibre optic isolater 5, the other end and wavelength division multiplexer by fibre optic isolater 5 join, and finish ring cavity structure; The outside, fiber coupler chamber, a port connects bragg grating, and the other end and laser output join.
In the laser works process, introduce the interacvity gain feedback through bragg grating FBG, simultaneously bragg grating FBG tuner is suitably regulated, make it have the tunable wave length characteristic, laser beam is exported from the coupler other end.The bragg grating mechanical tuning device generally can be taked following several mode: 1. mechanical tuning device, and as cantilever beam tuner, simply supported beam tuner etc.Its material is to have the metal of elastomeric property or nonmetal, as manganese steel sheet or methacrylate sheet etc.Beam is designed to homogeneous, uniform thickness, sheet or isoceles triangle shape, and FBG then is pasted on the appropriate position on the beam.2. electric tuning device is as ferroelectric, piezoelectric ceramic, solenoid tube etc.Its shape can be designed to homogeneous tubulose or plates.FBG promptly is pasted on its surperficial appropriate location; 3. interferometer tuner is as Mach-Zehnder (M-Z) fibre optic interferometer, F-P fibre optic interferometer etc.Its material is that full optical fiber constitutes, and its feature has the comb filter performance; 4. the thermal tuning device adopts the polymer with temperature sensitive effect to carry out the stress-free process encapsulation process to fiber grating, by can reach the purpose of wavelength tuning to the heating of the fiber grating after encapsulation regulation and control.
For erbium doped fiber laser, noise can make the definition of its signal reduce.For adapting to the requirement of high-speed, big Capacity Optical communication system, must manage to improve the signal to noise ratio of erbium doped fiber laser.Erbium doped fiber laser is made working substance matter with Er-doped fiber, belongs to three level system.In the laser generation process, except that amplify producing the laser through being excited radiation, also be accompanied by the generation of spontaneous radiation (ASE), the interaction of it and signal photon and produce noise, this noise all may take place in the whole fluorescence Spectra scope of erbium doped fiber laser, its frequency band is very wide, and is two-way propagation, is the main source of erbium doped fiber laser noise.Only place a fibre optic isolater in the general erbium doped fiber laser, though guaranteed the unidirectional operation of the laser generation in the chamber, the ASE of backpropagation still can export simultaneously by coupler and laser, influences the signal to noise ratio of laser equally.In optical communication system, this noise will constantly be amplified by amplifiers at different levels with flashlight, thereby take the photon that can participate in stimulated radiation in the amplifier originally especially, make Amplifier Gain descend signal-to-noise ratio degradation.
The method that reduces erbium doped fiber laser ASE noise is used the method for narrow band filter usually, but the insertion loss of narrow band filter big (more than the 3dB) will have a strong impact on the power output of laser.The method that the present invention adopts is oppositely to insert the fibre optic isolater of an isolation greater than 50dB in laser, can suppress the ASE of backpropagation so effectively, and insert loss very low (less than 0.3dB).
Along with the continuous increase of communication service kind and message capacity, be that live width and single polarization have proposed strict demand to the monochromaticjty of communication light source.For obtaining the laser output of narrow linewidth, single polarization, multiple solution was successively proposed both at home and abroad.But existing scheme easily makes laser output produce the intrinsic noise of warbling, thereby reduces the signal to noise ratio of signal.Beneficial effect of the present invention: can obtain narrow linewidth, the output of single polarization laser, the live width that is obtained can be less than 1GHz, and the live width that is equivalent to 1550nm wave band place is less than 0.008nm.
Description of drawings
Fig. 1: tunable wave length, narrow linewidth, high s/n ratio list polarization annular chamber full-optical-fiber laser structure chart
Fig. 2: after (b) improved before the output spectrum (a) before and after laser improves improved
Fig. 3: eye pattern a. laser transmission (0km) b. laser transmission back, back (100km) before and after the laser transmission 100km
Fig. 4: the oscillogram when modulating before and after the transmission with the analog signal of 2.5GHz
A, transmission 50km download the waveform that records after downloading waveform b, the transmission 100km that records
Wherein: 1. semiconductor laser LD, 2.980/1550nm wavelength division multiplexer WDM, 3. Er-doped fiber EDF, 4. fibre optic isolater PI-ISO, 5. fibre optic isolater PI-ISO, 6. fibre optic polarizer PR, 7. fiber coupler Coupler, 8. bragg grating FBG, 9. laser output.
Embodiment
Below in conjunction with drawings and Examples the present invention is specifically described:
This tunable wave length, narrow linewidth, high s/n ratio list polarization annular chamber full-optical-fiber laser, it comprises: semiconductor laser LD1, wavelength division multiplexer WDM2, Er-doped fiber EDF3, fibre optic isolater PI-ISO (4,5), fibre optic polarizer PR6, fiber coupler Coupler7, bragg grating FBG8 and from laser output 9, the laser of semiconductor laser output is exported to wavelength division multiplexer, incide Er-doped fiber, be transferred to fibre optic isolater 4 more successively, fibre optic polarizer, be connected with a port of inboard, fiber coupler chamber, another port is connected with fibre optic isolater 5, the other end and wavelength division multiplexer by fibre optic isolater 5 join, and finish ring cavity structure; The outside, fiber coupler chamber, a port connects bragg grating, and the other end and laser output join.
The outside, the fiber coupler chamber little port of coupling ratio connects laser output; The port that coupling ratio is big connects bragg grating.Among the present invention, fiber coupler is 30: 70 fiber couplers, and 70% termination FBG of coupler is to provide the laser power feedback, and 30% termination laser output is to provide laser output.
Bragg grating FBG8 adopts laser interferance method or mask means to be made on monomode fiber, and its centre wavelength is the Bragg fiber grating of 1060-1565nm.
Fibre optic isolater 4,5 is and polarization irrelevant isolator PI-ISO that wherein fibre optic isolater 4 forwards insert in the laser cavity, guarantee the unidirectional operation of endovenous laser; 5 of another fibre optic isolaters oppositely insert in the chamber, to guarantee to obtain the laser output of high s/n ratio.
Fibre optic polarizer 6 can be the special optic fibre polarizer, and the also available relevant isolator transformation of the way with polarization forms.
This laser is steady operation at normal temperatures.
Embodiment
Tunable wave length, narrow linewidth, high s/n ratio list polarization annular chamber full-optical-fiber laser structure such as Fig. 1.The 980nm LD1 laser of the fine output of magnetic tape trailer incides among the Er-doped fiber EDF3 through 980/1550nm wavelength division multiplexer WDM2, wherein end in the chamber of its another termination fibre optic isolater PI-ISO4, fibre optic polarizer PR6 and 30: 70 fiber coupler Coupler7, the other end in its chamber then connects fibre optic isolater PI-ISO5, the other end and 980/1550nm wavelength division multiplexer WDM2 by fibre optic isolater 5 join, and finish ring cavity structure at last.In the two-port outside the fiber coupler chamber, 70% termination Bragg fiber light Gate 8 is to provide the endovenous laser feedback, and the fiber coupler other end (30% end) then provides laser output.
In this annular chamber full-optical-fiber laser, 980nm LD laser is pump light source, its peak wavelength is 874.5nm, half width 2.4nm, 980nm laser is coupled into through 980/1550nm wavelength division multiplexer WDM and is mapped to Er-doped fiber EDF, Er-doped fiber length is 7.5m, and doping content is 100 * 10-6, and EDF plays a part laser gain and amplifies.Fibre optic isolater PI-ISO4 can guarantee the unidirectional running of 1550nm laser in this annular chamber, and another isolator 5 (isolation 50dB) then can effectively suppress the spontaneous radiation ASE of backpropagation in the chamber, and its insertion loss is minimum.In this example, not adding isolator 5 laser signal to noise ratios in the laser cavity is 41.4dB, adds isolator 5 back signal to noise ratios and has brought up to 46.6dB.Fibre optic polarizer PR6 in the laser inserts, and make those patterns of having only polarization mode to be parallel to this polarizer major axes orientation in the chamber could form vibration, and the pattern of other polarization direction all is suppressed, and has guaranteed single polarization characteristic of laser.Optical fiber light Gate is that we adopt the phase mask method to develop voluntarily, and its reflection kernel wavelength is 1555.8nm, and reflectivity is 98%, and half width is 0.1nm.To adopt the cantilever beam tuner that optical fiber light Gate centre wavelength can be carried out in the 6nm scope tuning arbitrarily for optical fiber light Gate in this example.Finally obtaining laser output power exports less than the high-quality laser of 1GHz tunable wave length greater than 46dB, live width greater than 1.6mw, signal to noise ratio.Fig. 2 improves the output spectrum of front and back for this laser.
For verifying the practicality of this laser, we have carried out this laser the optical transmission experiment of 100km in the WDM transmission system of development voluntarily.When modulation signal was the NRZ of 1.2Gb/s, the eye pattern before and after its transmission as shown in Figure 3.As seen from the figure, the shape of eye pattern is very clear.Oscillogram when Fig. 4 modulates for the analog signal of using 2.5GHz before and after the transmission can see that by figure waveform keeps finely, and the distortion factor is the end very.Experiment showed, that this laser can be used as the light source of wdm system, has great application prospect.
Claims (6)
1. tunable wave length, narrow linewidth, high s/n ratio list polarization annular chamber full-optical-fiber laser, it is characterized in that: it comprises semiconductor laser LD (1), wavelength division multiplexer WDM (2), Er-doped fiber EDF (3), fibre optic isolater PI-ISO (4,5), fibre optic polarizer PR (6), fiber coupler Coupler (7), bragg grating FBG (8) and laser output (9), export to wavelength division multiplexer from the laser of semiconductor laser output, incide Er-doped fiber, be transferred to fibre optic isolater (4) more successively, fibre optic polarizer, be connected with a port of inboard, fiber coupler chamber, another port is connected with fibre optic isolater (5), the other end and wavelength division multiplexer by fibre optic isolater (5) join, and finish ring cavity structure; The outside, fiber coupler chamber, a port connects bragg grating, and the other end and laser output join.
2. tunable wave length according to claim 1, narrow linewidth, high s/n ratio list polarization annular chamber full-optical-fiber laser is characterized in that: the outside, the fiber coupler chamber little port of coupling ratio connects laser output; The port that coupling ratio is big connects bragg grating.
3. tunable wave length according to claim 2, narrow linewidth, high s/n ratio list polarization annular chamber full-optical-fiber laser, it is characterized in that: fiber coupler is 30: 70 fiber couplers, 70% termination FBG of coupler is to provide the laser power feedback, and 30% termination laser output is to provide laser output.
4. tunable wave length according to claim 1, narrow linewidth, high s/n ratio list polarization annular chamber full-optical-fiber laser, it is characterized in that: bragg grating FBG (8) adopts laser interferance method or mask means to be made on monomode fiber, and its centre wavelength is the Bragg fiber grating of 1060-1565nm.
5. tunable wave length according to claim 1, narrow linewidth, high s/n ratio list polarization annular chamber full-optical-fiber laser, it is characterized in that: fibre optic isolater (4,5) is the isolator (PI-ISO) with polarization irrelevant, wherein fibre optic isolater (4) forward inserts in the laser cavity, guarantees the unidirectional operation of endovenous laser; Another fibre optic isolater (5) then oppositely inserts in the chamber, to guarantee to obtain the laser output of high s/n ratio.
6. tunable wave length according to claim 1, narrow linewidth, high s/n ratio list polarization annular chamber full-optical-fiber laser, it is characterized in that: fibre optic polarizer (6) can be the special optic fibre polarizer, the also available relevant isolator transformation of the way with polarization forms.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100416948C (en) * | 2005-06-27 | 2008-09-03 | 北京理工大学 | Narrow-line width single frequency optical fiber laser |
| CN100444480C (en) * | 2007-02-05 | 2008-12-17 | 北京交通大学 | Ring tunable single-frequency single-polarization fiber laser |
| CN101969174A (en) * | 2010-09-21 | 2011-02-09 | 苏州大学 | Tunable all-fiber mode-locked laser |
| CN102157889A (en) * | 2011-03-21 | 2011-08-17 | 山东大学 | Fiber optical laser of L waveband with wavelength tunable |
| CN102403646A (en) * | 2011-11-22 | 2012-04-04 | 中国科学院上海光学精密机械研究所 | Controllable double wavelength optical fiber laser |
| CN102856780A (en) * | 2012-09-07 | 2013-01-02 | 山东海富光子科技股份有限公司 | 975nm ring cavity all-fiber laser |
| CN102946041A (en) * | 2012-11-26 | 2013-02-27 | 中国人民解放军国防科学技术大学 | Tunable single-polarization Brillouin erbium-doped optical fiber laser with super narrow linewidth |
| CN103090894A (en) * | 2013-01-10 | 2013-05-08 | 中国人民解放军国防科学技术大学 | Distributed optical fiber sensing device and method based on Brillouin Er-doped fiber laser |
| CN103337774A (en) * | 2013-05-31 | 2013-10-02 | 西北核技术研究所 | Tunable mode locking fiber laser based on fiber grating and graphene |
| CN103427318A (en) * | 2013-08-08 | 2013-12-04 | 安徽大学 | All-fiber external cavity tunable fiber laser |
| CN111416268A (en) * | 2020-03-23 | 2020-07-14 | 天津大学 | Optical fiber microphone of laser annular cavity |
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2003
- 2003-12-31 CN CNA2003101220250A patent/CN1556561A/en active Pending
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100416948C (en) * | 2005-06-27 | 2008-09-03 | 北京理工大学 | Narrow-line width single frequency optical fiber laser |
| CN100444480C (en) * | 2007-02-05 | 2008-12-17 | 北京交通大学 | Ring tunable single-frequency single-polarization fiber laser |
| CN101969174A (en) * | 2010-09-21 | 2011-02-09 | 苏州大学 | Tunable all-fiber mode-locked laser |
| CN102157889A (en) * | 2011-03-21 | 2011-08-17 | 山东大学 | Fiber optical laser of L waveband with wavelength tunable |
| CN102403646A (en) * | 2011-11-22 | 2012-04-04 | 中国科学院上海光学精密机械研究所 | Controllable double wavelength optical fiber laser |
| CN102856780A (en) * | 2012-09-07 | 2013-01-02 | 山东海富光子科技股份有限公司 | 975nm ring cavity all-fiber laser |
| CN102946041A (en) * | 2012-11-26 | 2013-02-27 | 中国人民解放军国防科学技术大学 | Tunable single-polarization Brillouin erbium-doped optical fiber laser with super narrow linewidth |
| CN102946041B (en) * | 2012-11-26 | 2014-05-21 | 中国人民解放军国防科学技术大学 | Tunable single-polarization Brillouin erbium-doped optical fiber laser with super narrow linewidth |
| CN103090894A (en) * | 2013-01-10 | 2013-05-08 | 中国人民解放军国防科学技术大学 | Distributed optical fiber sensing device and method based on Brillouin Er-doped fiber laser |
| CN103337774A (en) * | 2013-05-31 | 2013-10-02 | 西北核技术研究所 | Tunable mode locking fiber laser based on fiber grating and graphene |
| CN103337774B (en) * | 2013-05-31 | 2015-09-09 | 西北核技术研究所 | A kind of tunable mode-locked fiber laser based on fiber grating and Graphene |
| CN103427318A (en) * | 2013-08-08 | 2013-12-04 | 安徽大学 | All-fiber external cavity tunable fiber laser |
| CN103427318B (en) * | 2013-08-08 | 2016-07-06 | 安徽大学 | All-fiber external cavity tunable fiber laser |
| CN111416268A (en) * | 2020-03-23 | 2020-07-14 | 天津大学 | Optical fiber microphone of laser annular cavity |
| CN111416268B (en) * | 2020-03-23 | 2023-10-24 | 天津大学 | Optical fiber microphone with laser ring cavity |
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