CN105140767A - Dual-wavelength single-longitudinal-mode fiber laser - Google Patents
Dual-wavelength single-longitudinal-mode fiber laser Download PDFInfo
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- CN105140767A CN105140767A CN201510595718.4A CN201510595718A CN105140767A CN 105140767 A CN105140767 A CN 105140767A CN 201510595718 A CN201510595718 A CN 201510595718A CN 105140767 A CN105140767 A CN 105140767A
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Abstract
The invention discloses a dual-wavelength single-longitudinal-mode fiber laser. The dual-wavelength single-longitudinal-mode fiber laser comprises a pumping source, a wavelength division multiplexer, a Tm-Ho co-doped fiber, an optical fiber circulator, a first optical fiber coupler, a first adjustable attenuator, a second adjustable attenuator, a first fiber Bragg grating, a second fiber Bragg grating, and a second optical fiber coupler. A second input terminal of the first optical fiber coupler is connected with a second input terminal of the second optical fiber coupler to form an optical fiber feedback loop, and generated self-seeding phenomenon can effectively suppress mode hopping and stabilize single-longitudinal-mode operation of the laser; a saturable absorber is employed to generate a transient grating, the bandwidth of the transient grating is narrow, on one hand, the multi-longitudinal-mode oscillation of the laser can be suppressed, on the other hand, the outputted laser line width can be narrowed; the structure is simple, the cost is low, and the dual-wavelength single-longitudinal-mode fiber laser can be widely applied in the fields of multi-parameter gas detection, laser radar, medicine, and novel wavelength division multiplexing communication systems etc.
Description
Technical field
The invention belongs to fiber laser technology field, more specifically, relate to a kind of double-wavelength single-longitudinal-mode fiber laser.
Background technology
Fiber laser has a wide range of applications in multiple fields such as optical fiber communication, Fibre Optical Sensor, medical treatment.Optical fiber laser structure is simple, and cost is low, and thermal diffusivity is fine, stable output wavelength.But the current method realizing double-wavelength single-longitudinal-mode fiber laser also exists some shortcomings.
In order to realize the running of multi-wavelength single longitudinal mode in fiber laser, the most frequently used is following three kinds of methods.One, utilize short cavity and special fiber grating; Two, utilize the sub-chamber of high-fineness or ultra-narrow filter; Three, utilize rare earth doped fiber as saturated absorbing body.But above several method has its intrinsic shortcoming.Utilize short cavity and this method good stability of special fiber grating, but wavelength is not easy to realize tuning; Utilize the method in the sub-chamber of high-fineness to be difficult to obtain optimum sub-cavity length, ultra-narrow filter is difficult to make and expensive; Utilize rare earth doped fiber simple as saturated absorption body structure, but must optimize fiber lengths realize single longitudinal mode running.
Summary of the invention
For above defect or the Improvement requirement of prior art, the invention provides a kind of double-wavelength single-longitudinal-mode fiber laser, many longitudinal mode vibrations of laser and jumping can be effectively suppressed to be touched, the single longitudinal mode running of stable laser, obtain the Laser output of narrow linewidth, apparatus structure is simple, with low cost, can be widely used in the fields such as multi-parameter gas detection, laser radar, medical science, novel wavelength division multiplexing communications systems.
For achieving the above object, the invention provides a kind of double-wavelength single-longitudinal-mode fiber laser, it is characterized in that, comprise pumping source, wavelength division multiplexer, Tm-Ho co-doped fiber, optical fiber circulator, the first fiber coupler, the first adjustable attenuator, the second adjustable attenuator, the first Fiber Bragg Grating FBG, the second Fiber Bragg Grating FBG and the second fiber coupler; Described pumping source connects the first input end of described wavelength division multiplexer, the output of described wavelength division multiplexer connects the first port of described optical fiber circulator by described Tm-Ho co-doped fiber, second port of described optical fiber circulator connects the first input end of described first fiber coupler, first output of described first fiber coupler connects described first Fiber Bragg Grating FBG by described first adjustable attenuator, and the second output of described first fiber coupler connects described second Fiber Bragg Grating FBG by described second adjustable attenuator; 3rd port of described optical fiber circulator connects the first input end of described second fiber coupler, second input of described first fiber coupler connects the second input of described second fiber coupler, first output of described second fiber coupler connects the second input of described wavelength division multiplexer, and the second output of described second fiber coupler is as the output port of described double-wavelength single-longitudinal-mode fiber laser.
Preferably, during work, the 1570nm pump light that described pumping source sends, by Tm-Ho co-doped fiber described in described wavelength division multiplexer pumping, obtains the laser of 2 mu m wavebands; The laser of described 2 mu m wavebands arrives described first fiber coupler through described optical fiber circulator, two-way is divided into by described first fiber coupler, one tunnel arrives described first Fiber Bragg Grating FBG through described first adjustable attenuator, another road arrives described second Fiber Bragg Grating FBG through described second adjustable attenuator, and described first Fiber Bragg Grating FBG and described second Fiber Bragg Grating FBG are used for carrying out selection and tuning to optical maser wavelength; The light reflected by described first Fiber Bragg Grating FBG and described second Fiber Bragg Grating FBG arrives described first adjustable attenuator and described second adjustable attenuator respectively, described first adjustable attenuator and described second adjustable attenuator are used for switching by regulating the bending loss of optical fiber to realize wavelength, make the light reflected by described first Fiber Bragg Grating FBG and/or described second Fiber Bragg Grating FBG arrive described first fiber coupler.
Preferably, by the second input of described first fiber coupler being connected the second input of described second fiber coupler, form optical fiber feedback loop, to suppress mode hopping and the single longitudinal mode running of stablizing described double-wavelength single-longitudinal-mode fiber laser.
Preferably, above-mentioned double-wavelength single-longitudinal-mode fiber laser also comprises the saturated absorbing body between the second port and the first input end of described first fiber coupler being arranged on described optical fiber circulator, for suppressing many longitudinal mode vibrations of described double-wavelength single-longitudinal-mode fiber laser, also for narrowing the laser linewidth that described double-wavelength single-longitudinal-mode fiber laser exports further.
In general, the above technical scheme conceived by the present invention compared with prior art, has following beneficial effect:
1, by being connected with the second input of the second fiber coupler by the second input of the first fiber coupler, form an optical fiber feedback loop, consequent self-injection locking phenomenon effectively can suppress mode hopping, simultaneously the single longitudinal mode running of energy stable laser.
2, utilize saturated absorbing body to produce transient grating, the smaller bandwidth of transient grating, many longitudinal mode vibrations of laser can be suppressed on the one hand, the laser linewidth of output can be narrowed on the other hand.
3, apparatus structure is simple, with low cost, can be widely used in the fields such as multi-parameter gas detection, laser radar, medical science, novel wavelength division multiplexing communications systems.
Accompanying drawing explanation
Fig. 1 is the structural representation of the double-wavelength single-longitudinal-mode fiber laser of the embodiment of the present invention;
Fig. 2 is the laser output spectrum figure of the double-wavelength single-longitudinal-mode fiber laser of the embodiment of the present invention;
Fig. 3 is the wavelength switching figure of the double-wavelength single-longitudinal-mode fiber laser of the embodiment of the present invention;
Fig. 4 is the wavelength tuning figure of the double-wavelength single-longitudinal-mode fiber laser of the embodiment of the present invention;
Fig. 5 is the Laser output spectrogram of the double-wavelength single-longitudinal-mode fiber laser of the embodiment of the present invention.
In all of the figs, identical Reference numeral is used for representing identical element or structure, wherein: 1-pumping source, 2-wavelength division multiplexer, 3-Tm-Ho co-doped fiber, 4-optical fiber circulator, 5-saturated absorbing body, 6-first fiber coupler, 7-first adjustable attenuator, 8-second adjustable attenuator, 9-first Fiber Bragg Grating FBG, 10-second Fiber Bragg Grating FBG, 11-second fiber coupler.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.In addition, if below in described each execution mode of the present invention involved technical characteristic do not form conflict each other and just can mutually combine.
As shown in Figure 1, the double-wavelength single-longitudinal-mode fiber laser of the embodiment of the present invention comprises pumping source 1, wavelength division multiplexer (WavelengthDivisionMultiplexer, WDM) 2, Tm-Ho co-doped fiber 3, optical fiber circulator 4, first fiber coupler 6, first adjustable attenuator 7, second adjustable attenuator 8, first Fiber Bragg Grating FBG (FiberBraggGrating, FBG) 9, second Fiber Bragg Grating FBG 10 and the second fiber coupler 11.Pumping source 1 connects the first input end of wavelength division multiplexer 2, the output of wavelength division multiplexer 2 passes through the first port of Tm-Ho co-doped fiber 3 connecting fiber circulator 4, second port of optical fiber circulator 4 connects the first input end of the first fiber coupler 6, the second output that first output of the first fiber coupler 6 connects the first Fiber Bragg Grating FBG 9, first fiber coupler 6 by the first adjustable attenuator 7 connects the second Fiber Bragg Grating FBG 10 by the second adjustable attenuator 8.3rd port of optical fiber circulator 4 connects the first input end of the second fiber coupler 11, second input of the first fiber coupler 6 connects the second input of the second fiber coupler 11, first output of the second fiber coupler 11 connects the second input of wavelength division multiplexer 2, and the second output of the second fiber coupler 11 is as the output port of double-wavelength single-longitudinal-mode fiber laser.
During work, double-wavelength single-longitudinal-mode fiber laser adopts forward pumping structure, the 1570nm pump light that pumping source 1 sends is by wavelength division multiplexer 2 Pumped Tm-Ho co-doped fiber 3, Tm-Ho co-doped fiber 3 is as the gain media of fiber laser, under the exciting of 1570nm pump light, export the laser of 2 mu m wavebands.This laser arrives the first input end of the first fiber coupler 6 through optical fiber circulator 4, is divided into two-way by the first fiber coupler 6, and a road arrives a FBG9 through the first adjustable attenuator 7, and another road arrives the 2nd FBG10 through the second adjustable attenuator 8.Light after a FBG9 and/or the 2nd FBG10 reflects gets back to the first fiber coupler 6, the light exported from the first input end of the first fiber coupler 6 arrives the second fiber coupler 11 through the 3rd port of optical fiber circulator 4, a part exports wavelength division multiplexer 2 to by the first output of the second fiber coupler 11, for maintaining the annular running of laser, another part is exported, namely as the output of laser by the second output of the second fiber coupler 11.
Wherein, the second output of the first fiber coupler 6 connects the second input of the second fiber coupler 11, forms an optical fiber feedback loop, and consequent self-injection locking phenomenon can suppress the single longitudinal mode of mode hopping and stable laser to operate.
Further, above-mentioned double-wavelength single-longitudinal-mode fiber laser also comprises saturated absorbing body 5, is arranged between the second port of optical fiber circulator 4 and the first input end of the first fiber coupler 6.Saturated absorbing body 5 can produce transient grating, the smaller bandwidth of transient grating, can suppress many longitudinal mode vibrations of laser.Meanwhile, the transient grating of saturated absorbing body 5 also can play the effect narrowing Laser output live width.
In one embodiment of the invention, the 1570nmDFB module light source that pumping source 1 adopts Hong Yuan Micron Technology Co., Ltd of Shenzhen to produce, wavelength division multiplexer 2 adopts LighteltechCo., Ltd. the 1550/2000nm wavelength division multiplexer produced, the Tm-Ho co-doped fiber that Tm-Ho co-doped fiber 3 adopts Canadian CorActive company to produce, the 1950nm optical fiber circulator that optical fiber circulator 4 adopts Advanced Fiber Resource (Zhuhai) Co., Ltd. to produce, for ensureing the Unidirectional of laser, the Tm-Ho co-doped fiber that saturated absorbing body 5 adopts Canadian CorActive company to produce, first fiber coupler 6 and the second fiber coupler 11 adopt homemade 2 × 2 standard single-mode fiber couplers in this laboratory, splitting ratio is 50:50, first adjustable attenuator 7 and the second adjustable attenuator 8 utilize the bending of optical fiber to carry out loss adjustment, for realizing the switching of dual wavelength, the 2 mu m waveband high reflectance FBG that one FBG9 and the 2nd FBG10 adopts Aston University to provide, centre wavelength is respectively 1897nm and 1923nm, reflectivity is respectively ~ and 96% and ~ 90%, for realizing the selection of optical maser wavelength and tuning.
Test above-mentioned laser, test result as shown in Figure 2-5.As can be seen from Figure 2, the centre wavelength of the laser that fiber laser exports is 1897.28nm and 1923.6nm respectively, and signal to noise ratio is about 25dB, and three dB bandwidth is all less than 0.06nm.Because two FBG are parallel-connection structures, two wavelength share same gain media, as can be seen from Figure 3, by regulating the bending loss of optical fiber of adjustable attenuator to control wavelength switching, can realize the stable output of wherein any one wavelength or dual wavelength.By regulate two FBG can centering cardiac wave progress row tuning, as shown in Figure 4, centre wavelength is the wavelength tuning range of the laser of 1897.28nm is 1890.56nm ~ 1897.28nm, and centre wavelength is the wavelength tuning range of the laser of 1923.6nm is 1920.72nm ~ 1923.44nm.
Fig. 5 is the Laser output spectrogram of the above-mentioned laser utilizing " zero balancing " to obtain.Utilize spectrum analyzer (RFESA) (AgilentE4447A) and photodetector (PD) (ThorlabsPDA10D-EC).Fig. 5 (a) illustrates that laser works is in stable single longitudinal mode state, and Fig. 5 (b) and Fig. 5 (c) illustrates when not having saturated absorbing body and feedback loop, there will be the situation of zlasing mode instability.
Those skilled in the art will readily understand; the foregoing is only preferred embodiment of the present invention; not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (4)
1. a double-wavelength single-longitudinal-mode fiber laser, it is characterized in that, comprise pumping source, wavelength division multiplexer, Tm-Ho co-doped fiber, optical fiber circulator, the first fiber coupler, the first adjustable attenuator, the second adjustable attenuator, the first Fiber Bragg Grating FBG, the second Fiber Bragg Grating FBG and the second fiber coupler; Described pumping source connects the first input end of described wavelength division multiplexer, the output of described wavelength division multiplexer connects the first port of described optical fiber circulator by described Tm-Ho co-doped fiber, second port of described optical fiber circulator connects the first input end of described first fiber coupler, first output of described first fiber coupler connects described first Fiber Bragg Grating FBG by described first adjustable attenuator, and the second output of described first fiber coupler connects described second Fiber Bragg Grating FBG by described second adjustable attenuator; 3rd port of described optical fiber circulator connects the first input end of described second fiber coupler, second input of described first fiber coupler connects the second input of described second fiber coupler, first output of described second fiber coupler connects the second input of described wavelength division multiplexer, and the second output of described second fiber coupler is as the output port of described double-wavelength single-longitudinal-mode fiber laser.
2. double-wavelength single-longitudinal-mode fiber laser as claimed in claim 1, it is characterized in that, during work, the 1570nm pump light that described pumping source sends, by Tm-Ho co-doped fiber described in described wavelength division multiplexer pumping, obtains the laser of 2 mu m wavebands; The laser of described 2 mu m wavebands arrives described first fiber coupler through described optical fiber circulator, two-way is divided into by described first fiber coupler, one tunnel arrives described first Fiber Bragg Grating FBG through described first adjustable attenuator, another road arrives described second Fiber Bragg Grating FBG through described second adjustable attenuator, and described first Fiber Bragg Grating FBG and described second Fiber Bragg Grating FBG are used for carrying out selection and tuning to optical maser wavelength; The light reflected by described first Fiber Bragg Grating FBG and described second Fiber Bragg Grating FBG arrives described first adjustable attenuator and described second adjustable attenuator respectively, described first adjustable attenuator and described second adjustable attenuator are used for switching by regulating the bending loss of optical fiber to realize wavelength, make the light reflected by described first Fiber Bragg Grating FBG and/or described second Fiber Bragg Grating FBG arrive described first fiber coupler.
3. double-wavelength single-longitudinal-mode fiber laser as claimed in claim 2, it is characterized in that, by the second input of described first fiber coupler being connected the second input of described second fiber coupler, form optical fiber feedback loop, to suppress mode hopping and the single longitudinal mode running of stablizing described double-wavelength single-longitudinal-mode fiber laser.
4. double-wavelength single-longitudinal-mode fiber laser as claimed any one in claims 1 to 3, it is characterized in that, also comprise the saturated absorbing body between the second port and the first input end of described first fiber coupler being arranged on described optical fiber circulator, for suppressing many longitudinal mode vibrations of described double-wavelength single-longitudinal-mode fiber laser, also for narrowing the laser linewidth that described double-wavelength single-longitudinal-mode fiber laser exports further.
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Cited By (3)
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| CN108233162A (en) * | 2017-12-29 | 2018-06-29 | 横琴东辉科技有限公司 | A kind of device for improving single frequency fiber laser signal-to-noise ratio in relevant optical tests |
| CN108680504A (en) * | 2018-05-23 | 2018-10-19 | 山东大学 | A kind of device and its working method of research iron-based superconducting thin material spin properties |
| CN111313217A (en) * | 2020-03-31 | 2020-06-19 | 中国人民解放军军事科学院国防科技创新研究院 | All-fiber architecture mode-hopping induced noise suppression device and suppression method |
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| CN108233162A (en) * | 2017-12-29 | 2018-06-29 | 横琴东辉科技有限公司 | A kind of device for improving single frequency fiber laser signal-to-noise ratio in relevant optical tests |
| CN108680504A (en) * | 2018-05-23 | 2018-10-19 | 山东大学 | A kind of device and its working method of research iron-based superconducting thin material spin properties |
| CN111313217A (en) * | 2020-03-31 | 2020-06-19 | 中国人民解放军军事科学院国防科技创新研究院 | All-fiber architecture mode-hopping induced noise suppression device and suppression method |
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