CN101794964A - Photoproduction microwave device based on double-wavelength Brillouin optical fiber laser - Google Patents
Photoproduction microwave device based on double-wavelength Brillouin optical fiber laser Download PDFInfo
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Abstract
The invention relates to a photoproduction microwave device based on a double-wavelength Brillouin optical fiber laser in the technical field of photoelectricity, comprising a DFB (Distributed Feedback) single-frequency laser, an optical fiber amplifier, an optical fiber circulator, an optical resonant cavity, a cascade resonant cavity, a photoelectrical detector and a frequency spectrograph, wherein the cascade resonant cavity and the optical resonant cavity respectively generate single-module laser with different frequencies. The invention does not need to use an additional microwave signal source to carry out optical frequency stabilization or optical modulation, is in a full-optical fiber light path structure, and has the advantages of simple structure and low cost; and Brillouin laser generated by the two resonant cavities is generated by the same DFB single-frequency laser pumping so that the microwave signals generated by the double-wavelength Brillouin optical fiber laser at a beat frequency have high frequency stability.
Description
Technical field
What the present invention relates to is a kind of device of field of photoelectric technology, specifically is a kind of photoproduction microwave device based on the dual wavelength Brillouin optical fiber laser.
Background technology
The conventional method that produces high-frequency microwave signal mainly be by complexity electronic circuit with the low frequency microwave signal step by step frequency multiplication realize---electricity is given birth to microwave technology.Though this method is comparative maturity technically, be used for electronic circuit system more complicated that high-frequency microwave signal produces and with high costs.And in a lot of the application, the microwave signal that is produced need be transmitted far distance, if transmit its loss very big (loss of 60GHz microwave in atmosphere is 14dB/km) by common coaxial cable transmission or air.Therefore, electricity is given birth to microwave technology and has been run into and more and more be difficult to the bottleneck that overcomes.Having developed a kind of new high-frequency microwave generating technique in recent years---the photoproduction microwave technology then can overcome at present gives birth to the bottleneck that microwave technical field is run at electricity.Because light signal has high frequency, the microwave signal frequency that beat frequency is given birth to can more easily reach GHz, even tens GHz magnitudes.Light signal is by Optical Fiber Transmission, and optical fiber has broadband, low-loss and low-cost characteristic, so the photoproduction microwave signal can transmit far distance, and greatly reduces the cost and the complexity of system.
In the prior art, the photoproduction microwave has three kinds of realization approach: first kind is to produce laser by two separate single frequency lasers to carry out beat frequency, and the frequency of beat frequency microwave signal is the poor of these two lasers output laser frequencies.But in order to obtain having the microwave signal of low phase noise and high frequency stability, the phase place of two LASER Light Source must be locked, this just needs to use optics injection locking technique or optical phase locked loop technology, and these two kinds of optical lock-on technology all need a high stable microwave derived reference signal; Second kind of photoproduction microwave technology is by use external modulation technology, but this technology also needs a high stable microwave derived reference signal, and this has similarly increased the cost and the complexity of system; The third photoproduction microwave technology is by using a laser, this laser is single-longitudinal-mode dual-wavelength output, beat frequency is directly carried out in this dual-wavelength laser output can obtain the photoproduction microwave signal, this technology has the high and low characteristics of phase noise of frequency stability, and does not need to use high stable with reference to microwave signal source.
Through existing literature search is found, the Jianping Yao people such as (Yao Jianping) of Canada University of Ottawa is at IEEETransactions on microwave theory and techniques, 2006,54 (2), the article that is entitled as " Photonic generation of microwavesignal using a dual-wavelength single-longitudinal-mode fiber ring laser (using the photoproduction microwave technology of dual-wavelength single-longitudinal mode optical fiber ring laser) " is disclosed on 804～809 (" microwave theory and technique " 54 in 2006 rolled up 804～809 pages of the 2nd phases), this technology uses two special FBG (Fiber Bragg Grating FBG) that make to carry out the laser modeling, a FBG utilizes its transmission spectral line, another FBG utilizes its reflection spectral line, when the spectral line of these two FBG overlaps mutually properly, this optical fiber ring laser can obtain single-longitudinal-mode dual-wavelength output, directly beat frequency is carried out in this laser output and can obtain microwave signal.But this technology requires very strictness to the characteristic of these two FBG, and this has increased the manufacture difficulty of this FBG, also makes system cost higher.
Summary of the invention
The objective of the invention is to overcome the above-mentioned deficiency of prior art, a kind of photoproduction microwave device based on the dual wavelength Brillouin optical fiber laser is provided.The present invention is by dual wavelength output the carrying out beat frequency to laser, realized having the generation of the microwave signal of frequency high stability, do not need to use extra reference microwave signal source to carry out optics frequency stabilization or optical modulation, be the full optical fiber optical optical line structure, have advantage simple in structure and with low cost.
The present invention is achieved by the following technical solutions, the present invention includes: DFB (distributed feedback semiconductor) single frequency laser, fiber amplifier, optical fiber circulator, optical resonator, cascade resonator, photodetector and frequency spectrograph, wherein: the DFB single frequency laser links to each other with fiber amplifier and transmits the single-frequency laser signal, the fiber amplifier single-frequency laser signal of transmission after amplifying that link to each other with first port of optical fiber circulator, second port of the optical fiber circulator single-frequency laser signal of transmission after amplifying that link to each other with optical resonator, the optical resonator single-frequency laser signal of transmission after amplifying that link to each other with cascade resonator, the 3rd port of optical fiber circulator links to each other with photodetector and transmits the dual-wavelength laser signal, and photodetector links to each other with frequency spectrograph and transmits the beat frequency microwave signal.
Described cascade resonator produces the different single-mode laser of frequency respectively with described optical resonator.
Described fiber amplifier is used to amplify the single-frequency laser signal of DFB single frequency laser output, comprise: first pumping source, second pumping source, the one WDM (wavelength division multiplexer), the 2nd WDM and doped fiber, wherein: first pumping source links to each other with the partial wave end of a WDM and transmits pump light, the DFB single frequency laser links to each other with another partial wave end of a WDM and transmits the single-frequency laser signal, the one WDM close the ripple end link to each other with an end of doped fiber the transmission laser signal, the other end of doped fiber and the 2nd WDM close the ripple end transmission laser signal that links to each other, the partial wave end of the 2nd WDM links to each other with second pumping source and transmits pump light, and another partial wave end of the 2nd WDM links to each other with first port of optical fiber circulator with the single-frequency laser signal after the transmission amplification.
Described doped fiber is a kind of in Er-doped fiber, Yb dosed optical fiber and the thulium doped fiber.
Described optical resonator is used to produce first wavelength laser, comprise: the one or four port coupler, first isolator and first optical fiber, wherein: the first input end of the one or four port coupler links to each other with second port of optical fiber circulator, second input of the one or four port coupler links to each other with the input of first isolator, the output of first isolator links to each other with an end of first optical fiber, the other end of first optical fiber links to each other with first output of the one or four port coupler, and second output of the one or four port coupler links to each other with cascade resonator.
Described first optical fiber is a kind of among DCF (dispersion compensating fiber), DSF (dispersion shifted optical fiber), NZDSF (non-zero dispersion displacement optical fiber), SMF (monomode fiber) and the HNLF (highly nonlinear optical fiber).
Described cascade resonator is used to produce second wavelength laser, comprise: the two or four port coupler, second isolator and second optical fiber, wherein: the first input end of the two or four port coupler links to each other with second output of the one or four port coupler, second input of the two or four port coupler links to each other with the input of second isolator, the output of second isolator links to each other with an end of second optical fiber, the other end of second optical fiber links to each other with first output of the two or four port coupler, and second output of the two or four port coupler is vacant.
Described second optical fiber is a kind of among DCF, DSF, NZDSF, SMF and the HNLF.
Operation principle of the present invention is: the DFB single frequency laser is as signal source, the single-frequency laser signal of its output amplifies through fiber amplifier again imports optical resonator and cascade resonator through behind the optical fiber circulator respectively as Brillouin's pump light, two resonant cavitys embed different types of optical fiber respectively as the brillouin gain medium, and the frequency of the one-level Brillouin laser that then excites in resonant cavity is
f＝f
0+v
B (1)
Wherein: f
0Be Brillouin's pump light frequency, also be the output frequency of DFB single frequency laser, v
BFor Brillouin's pump light wavelength is λ
PThe time the corresponding Brillouin shift amount that embeds optical fiber, for:
v
B＝2nυ
A/λ
P (2)
Wherein: n is in pump wavelength
PThe refractive index at place.υ
ABe the velocity of sound in the optical fiber, it is only relevant with the character of optical fiber own, and has
Wherein: γ is the Young's modulus of fiber optic materials, and ρ is the volume density of fiber optic materials.
Embed different types of optical fiber in the different resonant cavitys, then these two resonant cavitys will inspire the Brillouin laser of two kinds of different frequencies, establish its Brillouin shift amount and be respectively v
B1And v
B2Because in optical fiber, traffic direction (being defined as forward direction) with respect to Brillouin's pump light, stimulated Brillouin optical only occur in the back to, so the Brillouin laser of two different frequencies of two resonant cavity generations all will be from the 3rd port output of optical fiber circulator, it is inserted photodetector, then can obtain the beat frequency microwave signal of two Brillouin lasers, gained beat frequency microwave signal frequency is
f
RF＝|v
B1-v
B2| (4)
Compared with prior art, the invention has the beneficial effects as follows: do not need to use extra microwave signal source to carry out the optics frequency stabilization or carry out optical modulation, be the full optical fiber optical optical line structure, has advantage simple in structure and with low cost, and two Brillouin lasers that resonant cavity produced are all produced by same DFB single-frequency laser pumping, so this dual wavelength Brillouin optical fiber laser microwave signal that beat frequency is given birth to has very high frequency stability.
Description of drawings
Fig. 1 is a structural representation of the present invention;
Wherein: the 1-DFB single frequency laser; 2-first pumping source; 3-the one WDM; The 4-doped fiber; 5-the 2nd WDM; 6-second pumping source; The 7-optical fiber circulator; 8-the one or four port coupler; 9-first optical fiber; 10-first isolator; 11-the two or four port coupler; 12-second optical fiber; 13-second isolator; The 14-photodetector; The 15-frequency spectrograph.
Fig. 2 is the structural representation of four port coupler;
Wherein: 16-first input end mouth; 17-second input port; 18-second output port; 19-first output port.
The beat frequency microwave signal spectrogram that Fig. 3 obtains for embodiment;
Wherein: (a) be the beat frequency microwave signal spectrogram that embodiment 1 obtains; (b) be the beat frequency microwave signal spectrogram that embodiment 2 obtains; (c) be the beat frequency microwave signal spectrogram that embodiment 3 obtains; (d) be the beat frequency microwave signal spectrogram that embodiment 4 obtains; (e) be the beat frequency microwave signal spectrogram that embodiment 5 obtains; (f) be the beat frequency microwave signal spectrogram that embodiment 6 obtains.
The beat frequency microwave signal frequency that Fig. 4 obtains for embodiment 2 changes schematic diagram with the Distributed Feedback Laser output frequency.
The beat frequency microwave signal frequency that Fig. 5 obtains for embodiment 2 changes schematic diagram with Measuring Time.
Embodiment
Below in conjunction with accompanying drawing embodiments of the invention are elaborated: present embodiment is being to implement under the prerequisite with the technical solution of the present invention, provided detailed execution mode and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
As shown in Figure 1, present embodiment comprises: DFB single frequency laser 1, erbium-doped fiber amplifier, optical fiber circulator 7, optical resonator, cascade resonator, photodetector 14 and frequency spectrograph 15, wherein: DFB single frequency laser 1 links to each other with the erbium-doped fiber amplifier input, to amplify the single-frequency laser signal of DFB single frequency laser 1 output, the output of erbium-doped fiber amplifier links to each other with first port of optical fiber circulator 7, its second port links to each other with optical resonator, optical resonator links to each other with cascade resonator, single-frequency laser after the amplification is imported optical resonator and cascade resonator successively by second port of circulator 7, the laser signal of the 3rd port output dual wavelength Brillouin optical fiber laser of optical fiber circulator, its the 3rd port links to each other with photodetector 14 so that this laser signal is carried out beat frequency, and photodetector 14 links to each other so that the microwave signal of beat frequency gained is measured with frequency spectrograph 15.
Described erbium-doped fiber amplifier is used to amplify the single-frequency laser signal of DFB single frequency laser 1 output to make Brillouin's pump light, comprise: a 980nm pumping source 2, the 2nd 980nm pumping source 6, the one WDM3, the 2nd WDM 5 and EDF (Er-doped fiber) 4, wherein: the partial wave port of a WDM 3 links to each other with DFB single frequency laser 1, the one 980nm pumping source 2 links to each other with another partial wave port of a WDM 3, the ripple port that closes of the one WDM 3 links to each other with EDF 4 one ends, EDF 4 other ends link to each other with the ripple port that closes of the 2nd WDM 5, the partial wave port of the 2nd WDM 5 links to each other with the 2 980 pumping source 6, and another partial wave port of the 2nd WDM 5 links to each other with 1 port of optical fiber circulator 7 as the output port of erbium-doped fiber amplifier.
Described optical resonator is used to produce first wavelength laser, comprise: the one or four port coupler 8, first isolator 10 and DCF 9, wherein: described the one or four port coupler 8 is 50/50 four port coupler for coupling ratio, its first input end mouth links to each other with second port of optical fiber circulator 7, second input port links to each other with the input of first isolator 10, the output of first isolator 10 links to each other with DCF 9 one ends, DCF 9 other ends link to each other with first output port of the one or four port coupler 8, and second output port of the one or four port coupler 8 links to each other with the first input end mouth of the two or four port coupler 11 as the port of drawing of another part Brillouin pump light.
Described cascade resonator is used to produce second wavelength laser, comprise: the two or four port coupler 11, second isolator 13 and DSF 12, wherein: the two or four port coupler 11 is 50/50 four port coupler for coupling ratio, its first input end mouth links to each other with second output port of described the one or four port coupler 8, second input port of the two or four port coupler 11 links to each other with second isolator, 13 inputs, second isolator, 13 outputs link to each other with DSF 12 1 ends, DSF 12 other ends link to each other with first output port of the two or four port coupler 11, and second output port of the two or four port coupler 11 is vacant.
The structural representation of described four port coupler as shown in Figure 2.
The wavelength of the DFB single frequency laser 1 described in the present embodiment is 1544nm.
The peak power output of a described 980nm pumping source 2 is 330mW, and the peak power output of the 2nd 980nm pumping source 6 is 250mW, and the power of two 980nm pumping sources can be regulated continuously.
Described Er-doped fiber 4 length are 13.5m, and doping content is 400ppm.
Described DCF 9 length are 200m, and its Brillouin shift is 9.77GHz.
Described DSF 12 length are 500m, and its Brillouin shift is 10.718GHz.
During present embodiment work, the output signal optical power adjusting of DFB single frequency laser 1 is arrived maximum (10mW), the power output of two 980nm pumping sources is transferred to maximum, flashlight amplifies back power through erbium-doped fiber amplifier and rises to 206mW, two resonant cavitys of input are as Brillouin's pump light after passing through the unnecessary 980nm pump light of specific wavelength (1550nm) optical fiber circulator 7 filterings again, optical resonator and cascade resonator excite the Brillouin laser of different wave length respectively, the 3rd port by optical fiber circulator 7 outputs to photodetector 14 and carries out beat frequency at last, its beat frequency microwave signal frequency is 948.0MHz, and gained microwave signal spectrogram is shown in Fig. 3 (a).
Embodiment 2
The difference of present embodiment and embodiment 1 is: second optical fiber in the present embodiment cascade resonant cavity is HNLF, and the length of this HNLF is 253m, and corresponding Brillouin shift is HNLF:9.405GHz.
The Measurement Resolution of described frequency spectrograph 15 is 0.1MHz.
The beat frequency microwave signal frequency that present embodiment obtains is 365.6MHz, and its spectrogram is shown in Fig. 3 (b).
The beat frequency microwave signal frequency that present embodiment obtains changes schematic diagram, and as shown in Figure 4, as can be seen from Figure 4, the frequency of beat frequency microwave signal is very little with the amount that the pump light frequency change changes, less than the Measurement Resolution 0.1MHz of frequency spectrograph.
Measure after two hours, the beat frequency microwave signal frequency that present embodiment obtains changes schematic diagram with Measuring Time, as shown in Figure 5, as can be seen from Figure 5, the beat frequency microwave signal frequency is subjected to the influence of surrounding environment parameter (temperature, humidity) very little, less than the Measurement Resolution 0.1MHz of frequency spectrograph.
The difference of present embodiment and embodiment 1 is: second optical fiber in the present embodiment cascade resonant cavity is NZDSF, and the length of this NZDSF is 350m, and corresponding Brillouin shift is 10.895GHz.
The beat frequency microwave signal frequency that present embodiment obtains is 1115.0MHz, and its spectrogram is shown in Fig. 3 (c).
The difference of present embodiment and embodiment 3 is: first optical fiber in the present embodiment in the optical resonator is DSF, and the length of this DSF is 200m, and corresponding Brillouin shift is 10.718GHz.
The beat frequency microwave signal frequency that present embodiment obtains is 175.0MHz, and its spectrogram is shown in Fig. 3 (d).
Embodiment 5
As shown in Figure 1, present embodiment comprises: DFB single frequency laser 1, ytterbium doped optical fiber amplifier, optical fiber circulator 7, optical resonator, cascade resonator, photodetector 14 and frequency spectrograph 15, wherein: DFB single frequency laser 1 links to each other with the ytterbium doped optical fiber amplifier input, to amplify the single-frequency laser signal of DFB single frequency laser 1 output, the output of ytterbium doped optical fiber amplifier links to each other with first port of optical fiber circulator 7, its second port links to each other with optical resonator, optical resonator links to each other with cascade resonator, single-frequency laser after the amplification is imported optical resonator and cascade resonator successively by second port of circulator 7, the laser signal of the 3rd port output dual wavelength Brillouin optical fiber laser of optical fiber circulator, its 3 port links to each other with photodetector 14 so that this laser signal is carried out beat frequency, and photodetector 14 links to each other so that the microwave signal of beat frequency gained is measured with frequency spectrograph 15.
Described ytterbium doped optical fiber amplifier is used to amplify the single-frequency laser signal of DFB single frequency laser 1 output to make Brillouin's pump light, comprise: a 980nm pumping source 2, the 2nd 980nm pumping source 6, the one WDM 3, the 2nd WDM 5 and YbDF 4, wherein: the partial wave port of a WDM 3 links to each other with DFB single frequency laser 1, the one 980nm pumping source 2 links to each other with another partial wave port of a WDM 3, the ripple port that closes of the one WDM 3 links to each other with YbDF 4 one ends, YbDF 4 other ends link to each other with the ripple port that closes of the 2nd WDM 5, the partial wave port of the 2nd WDM 5 links to each other with the 2 980 pumping source 6, and another partial wave port of the 2nd WDM 5 links to each other with 1 port of optical fiber circulator 7 as the output port of ytterbium doped optical fiber amplifier.
Described optical resonator is used to produce first wavelength laser, comprise: the one or four port coupler 8, first isolator 10 and SMF 9, wherein: described the one or four port coupler 8 is 50/50 four port coupler for coupling ratio, its first input end mouth links to each other with second port of optical fiber circulator 7, second input port links to each other with the input of first isolator 10, the output of first isolator 10 links to each other with SMF 9 one ends, SMF 9 other ends link to each other with first output port of the one or four port coupler 8, and second output port of the one or four port coupler 8 links to each other with the first input end mouth of the two or four port coupler 11 as the port of drawing of another part Brillouin pump light.
Described cascade resonator is used to produce second wavelength laser, comprise: the two or four port coupler 11, second isolator 13 and NZDSF 12, wherein: the two or four port coupler 11 is 50/50 four port coupler for coupling ratio, its first input end mouth links to each other with second output port of described the one or four port coupler 8, second input port of the two or four port coupler 11 links to each other with second isolator, 13 inputs, second isolator, 13 outputs link to each other with NZDSF 12 1 ends, NZDSF 12 other ends link to each other with first output port of the two or four port coupler 11, and second output port of the two or four port coupler 11 is vacant.
The wavelength of described DFB single frequency laser 1 is 1575nm.
The peak power output of a described 980nm pumping source 2 is 330mW, and the peak power output of described the 2nd 980nm pumping source 6 is 250mW, and the power of two 980nm pumping sources can be regulated continuously.
Described Yb dosed optical fiber 4 length are 7.5m.
Described SMF 9 length are 300m, and corresponding Brillouin shift is 11.01GHz.
Described NZDSF 12 length are 350m, and corresponding Brillouin shift is 10.895GHz.
During present embodiment work, the output signal optical power adjusting of DFB single frequency laser 1 is arrived maximum (8mW), the power output of two 980nm pumping sources is transferred to maximum, flashlight amplifies back power through ytterbium doped optical fiber amplifier and rises to 160mW, again through importing two resonant cavitys as Brillouin's pump light behind the unnecessary 980nm pump light of optical fiber circulator 7 filterings.Optical resonator and cascade resonator excite the Brillouin laser of different wave length respectively, and the 3rd port by optical fiber circulator 7 outputs to photodetector 14 and carries out beat frequency at last, and its beat frequency microwave signal frequency is 115.0MHz, and its spectrogram is shown in Fig. 3 (e).
Embodiment 6
As shown in Figure 1, present embodiment comprises: DFB single frequency laser 1, thulium doped fiber amplifier, optical fiber circulator 7, optical resonator, cascade resonator, photodetector 14 and frequency spectrograph 15, wherein: DFB single frequency laser 1 links to each other with the thulium doped fiber amplifier input, to amplify the single-frequency laser signal of DFB single frequency laser 1 output, the output of thulium doped fiber amplifier links to each other with first port of optical fiber circulator 7, its second port links to each other with optical resonator, optical resonator links to each other with cascade resonator, single-frequency laser after the amplification is imported optical resonator and cascade resonator successively by second port of circulator 7, the laser signal of the 3rd port output dual wavelength Brillouin optical fiber laser of optical fiber circulator, its the 3rd port links to each other with photodetector 14 so that this laser signal is carried out beat frequency, and photodetector 14 links to each other so that the microwave signal of beat frequency gained is measured with frequency spectrograph 15.
Described thulium doped fiber amplifier is used to amplify the single-frequency laser signal of DFB single frequency laser 1 output to make Brillouin's pump light, comprise: a 1064nm pumping source 2, the 2nd 1064nm pumping source 6, the one WDM 3, the 2nd WDM 5 and TDF (thulium doped fiber) 4, wherein: the partial wave end of a WDM 3 links to each other with DFB single frequency laser 1, the one 1064nm pumping source 2 links to each other with another partial wave end of a WDM 3, the ripple end that closes of the one WDM 3 links to each other with TDF 4 one ends, TDF 4 other ends link to each other with the ripple end that closes of the 2nd WDM 5, the partial wave end of the 2nd WDM 5 links to each other with the 2nd 1064nm pumping source 6, and the ripple end that closes of the 2nd WDM 5 links to each other with 1 port of optical fiber circulator 7 as the output port of thulium doped fiber amplifier.
Described optical resonator is used to produce first wavelength laser, comprise: the one or four port coupler 8, first isolator 10 and DSF 9, wherein: described the one or four port coupler 8 is 50/50 four port coupler for coupling ratio, its first input end mouth links to each other with second port of optical fiber circulator 7, second input port links to each other with the input of first isolator 10, the output of first isolator 10 links to each other with DSF 9 one ends, DSF 9 other ends link to each other with first output port of the one or four port coupler 8, and second output port of the one or four port coupler 8 links to each other with the first input end mouth of the two or four port coupler 11 as the port of drawing of another part Brillouin pump light.
Described cascade resonator is used to produce second wavelength laser, comprise: the two or four port coupler 11, second isolator 13 and SMF 12, wherein: the two or four port coupler 11 is 50/50 four port coupler for coupling ratio, its first input end mouth links to each other with second output port of described the one or four port coupler 8, second input port of the two or four port coupler 11 links to each other with second isolator, 13 inputs, second isolator, 13 outputs link to each other with SMF 12 1 ends, SMF 12 other ends link to each other with first output port of the two or four port coupler 11, and second output port of the two or four port coupler 11 is vacant.
The wavelength of described DFB single frequency laser 1 is 1510nm.
The peak power output of a described 1064nm pumping source 2 is 300mW; The peak power output of described the 2nd 1064nm pumping source 6 is 250mW, and two pumping source power can be regulated continuously.
Described thulium doped fiber 4 length are 8m.
Described DSF 9 length are 200m, and its corresponding Brillouin shift is 10.718GHz.
Described SMF 12 length are 300m, and its corresponding Brillouin shift is 11.01GHz.
During present embodiment work, the output signal optical power adjusting of DFB single frequency laser 1 is arrived maximum (10mW), the power output of two 1064nm pumping sources is transferred to maximum, flashlight amplifies back power through thulium doped fiber amplifier and rises to 180mW, again through importing two cascade resonators as Brillouin's pump light behind the unnecessary 1064nm pump light of optical fiber circulator 7 filterings, optical resonator and cascade resonator excite the Brillouin laser of different wave length respectively, the 3rd port by optical fiber circulator 7 outputs to photodetector 14 and carries out beat frequency at last, its beat frequency microwave signal frequency is 290.0MHz, and its spectrogram is shown in Fig. 3 (f).
Claims (7)
1. photoproduction microwave device based on the dual wavelength Brillouin optical fiber laser, comprise: the DFB single frequency laser, optical fiber circulator, photodetector and frequency spectrograph, it is characterized in that, also comprise: fiber amplifier, optical resonator and cascade resonator, wherein: the DFB single frequency laser links to each other with fiber amplifier and transmits the single-frequency laser signal, the fiber amplifier single-frequency laser signal of transmission after amplifying that link to each other with first port of optical fiber circulator, second port of the optical fiber circulator single-frequency laser signal of transmission after amplifying that link to each other with optical resonator, the optical resonator single-frequency laser signal of transmission after amplifying that link to each other with cascade resonator, the 3rd port of optical fiber circulator links to each other with photodetector and transmits the dual-wavelength laser signal, and photodetector links to each other with frequency spectrograph and transmits the beat frequency microwave signal.
2. the photoproduction microwave device based on the dual wavelength Brillouin optical fiber laser according to claim 1, it is characterized in that, described fiber amplifier comprises: first pumping source, second pumping source, the one WDM, the 2nd WDM and doped fiber, wherein: first pumping source links to each other with the partial wave end of a WDM and transmits pump light, the DFB single frequency laser links to each other with another partial wave end of a WDM and transmits the single-frequency laser signal, the one WDM close the ripple end link to each other with an end of doped fiber the transmission laser signal, the other end of doped fiber and the 2nd WDM close the ripple end transmission laser signal that links to each other, the partial wave end of the 2nd WDM links to each other with second pumping source and transmits pump light, and another partial wave end of the 2nd WDM links to each other with first port of optical fiber circulator with the single-frequency laser signal after the transmission amplification.
3. the photoproduction microwave device based on the dual wavelength Brillouin optical fiber laser according to claim 2 is characterized in that, described doped fiber is a kind of in Er-doped fiber, Yb dosed optical fiber and the thulium doped fiber.
4. the photoproduction microwave device based on the dual wavelength Brillouin optical fiber laser according to claim 1, it is characterized in that, described optical resonator comprises: the one or four port coupler, first isolator and first optical fiber, wherein: the first input end of the one or four port coupler links to each other with second port of optical fiber circulator, second input of the one or four port coupler links to each other with the input of first isolator, the output of first isolator links to each other with an end of first optical fiber, the other end of first optical fiber links to each other with first output of the one or four port coupler, and second output of the one or four port coupler links to each other with cascade resonator.
5. the photoproduction microwave device based on the dual wavelength Brillouin optical fiber laser according to claim 4, it is characterized in that described first optical fiber is a kind of in dispersion compensating fiber, dispersion shifted optical fiber, non-zero dispersion displacement optical fiber, monomode fiber and the highly nonlinear optical fiber.
6. the photoproduction microwave device based on the dual wavelength Brillouin optical fiber laser according to claim 1, it is characterized in that, described cascade resonator produces and comprises: the two or four port coupler, second isolator and second optical fiber, wherein: the first input end of the two or four port coupler links to each other with second output of the one or four port coupler, second input of the two or four port coupler links to each other with the input of second isolator, the output of second isolator links to each other with an end of second optical fiber, the other end of second optical fiber links to each other with first output of the two or four port coupler, and second output of the two or four port coupler is vacant.
7. the photoproduction microwave device based on the dual wavelength Brillouin optical fiber laser according to claim 6, it is characterized in that described second optical fiber is a kind of in dispersion compensating fiber, dispersion shifted optical fiber, non-zero dispersion displacement optical fiber, monomode fiber and the highly nonlinear optical fiber.
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| CN101949743A (en) * | 2010-08-09 | 2011-01-19 | 宁波诺驰光电科技发展有限公司 | Novel Brillouin time domain analyzer |
| CN102522678A (en) * | 2011-12-14 | 2012-06-27 | 上海交通大学 | Tunable precision frequency photoproduction microwave apparatus based on cascade Brillouin laser |
| CN103682977A (en) * | 2012-12-21 | 2014-03-26 | 聊城大学 | Tunable Brillouin laser generation method based on dispersion flattened fiber and device thereof |
| CN104155721A (en) * | 2014-09-02 | 2014-11-19 | 中国科学院半导体研究所 | Optical sampling system based on quantum dot mode-locked laser devices |
| US20170059962A1 (en) * | 2015-08-27 | 2017-03-02 | National Cheng Kung University | Photonic microwave generation apparatus and method thereof |
| CN110112635A (en) * | 2018-02-01 | 2019-08-09 | 桂林电子科技大学 | The method and device of changeable output multi-frequency microwave signal is generated based on multi-core optical fiber |
| CN111342904A (en) * | 2020-02-28 | 2020-06-26 | 湖南工学院 | Method for generating single-frequency oscillation microwave signal and single-frequency oscillation microwave signal source |
| CN112769023A (en) * | 2019-10-21 | 2021-05-07 | 中国计量科学研究院 | Microwave signal generating device and method |
| CN115452329A (en) * | 2022-09-13 | 2022-12-09 | 电子科技大学 | Method for measuring laser spectral characteristics based on microcavity Brillouin |
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| CN101247181A (en) * | 2008-03-18 | 2008-08-20 | 浙江大学 | Method and device for generating high-frequency microwave signal through optical fiber stimulated Brillouin scattering |
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| CN101949743B (en) * | 2010-08-09 | 2012-08-08 | 宁波诺驰光电科技发展有限公司 | Novel Brillouin time domain analyzer |
| CN101949743A (en) * | 2010-08-09 | 2011-01-19 | 宁波诺驰光电科技发展有限公司 | Novel Brillouin time domain analyzer |
| CN102522678A (en) * | 2011-12-14 | 2012-06-27 | 上海交通大学 | Tunable precision frequency photoproduction microwave apparatus based on cascade Brillouin laser |
| CN103682977B (en) * | 2012-12-21 | 2016-04-06 | 聊城大学 | A kind of tunable Brillouin laser production method based on Dispersion Flattened Fiber and device |
| CN103682977A (en) * | 2012-12-21 | 2014-03-26 | 聊城大学 | Tunable Brillouin laser generation method based on dispersion flattened fiber and device thereof |
| CN104155721B (en) * | 2014-09-02 | 2016-09-14 | 中国科学院半导体研究所 | Optical Sampling system based on quantum dot mode-locked laser |
| CN104155721A (en) * | 2014-09-02 | 2014-11-19 | 中国科学院半导体研究所 | Optical sampling system based on quantum dot mode-locked laser devices |
| US20170059962A1 (en) * | 2015-08-27 | 2017-03-02 | National Cheng Kung University | Photonic microwave generation apparatus and method thereof |
| US9857661B2 (en) * | 2015-08-27 | 2018-01-02 | National Cheng Kung University | Photonic microwave generation apparatus and method thereof |
| CN110112635A (en) * | 2018-02-01 | 2019-08-09 | 桂林电子科技大学 | The method and device of changeable output multi-frequency microwave signal is generated based on multi-core optical fiber |
| CN110112635B (en) * | 2018-02-01 | 2020-10-30 | 桂林电子科技大学 | Device for generating switchable output multi-frequency microwave signals based on multi-core optical fiber |
| CN112769023A (en) * | 2019-10-21 | 2021-05-07 | 中国计量科学研究院 | Microwave signal generating device and method |
| CN112769023B (en) * | 2019-10-21 | 2022-04-12 | 中国计量科学研究院 | Microwave signal generating device and method |
| CN111342904A (en) * | 2020-02-28 | 2020-06-26 | 湖南工学院 | Method for generating single-frequency oscillation microwave signal and single-frequency oscillation microwave signal source |
| CN115452329A (en) * | 2022-09-13 | 2022-12-09 | 电子科技大学 | Method for measuring laser spectral characteristics based on microcavity Brillouin |
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