CN103872552A - Ultra narrow linewidth tunable microwave signal source - Google Patents
Ultra narrow linewidth tunable microwave signal source Download PDFInfo
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- CN103872552A CN103872552A CN201410035569.1A CN201410035569A CN103872552A CN 103872552 A CN103872552 A CN 103872552A CN 201410035569 A CN201410035569 A CN 201410035569A CN 103872552 A CN103872552 A CN 103872552A
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Abstract
An ultra narrow linewidth tunable microwave signal source belongs to the field of photoelectron and microwave photonics and aims to solve problems of wide linewidth, high noise, complex system and high cost of a microwave signal source. The ultra narrow linewidth tunable microwave signal source is characterized in that pump light is output from an adjustable narrow linewidth Brillouin pump laser; the pump light is amplified by an Er-doped optical fiber amplifier; after passing a first three-port coupler, most pump light enters a four-port coupler by a polarization controller and a circulator; small part of the pump light achieves a second three-port coupler by a variable optical attenuator; one part, entering the four-port coupler, of the pump light enters a high non-linear optical fiber to excite first-order stokes light in the opposite direction while the other part is output from the port subjected to oblique angle processing; the odd number-order stokes light achieves the second three-port coupler by the circulator and an optical fiber bragg grating; the obtained dual-wavelength laser achieves a photoelectric detector by the second three-port coupler to carry out beat frequency to obtain a narrow linewidth high-frequency microwave signal and the signal is measured by an electric spectrometer.
Description
Technical field
The invention belongs to photoelectron and Microwave photonics field, be specifically related to a kind of microwave signal source based on double Brillouin shift interval single frequency optical fiber laser, the present invention is applied to wireless communication field.
Background technology
Along with making rapid progress of information technology, communications industry obtains development at a high speed.Produce that the device of microwave signal is simple in structure because having, high-frequency, can make full use of the advantages such as optical fibre device based on optical means, carry at radio communication, light in the fields such as microwave (radio over fiber, ROF) and have important application.The method that the optics of traditional microwave signal produces comprises: the methods such as pouring-in locking, phase type locked laser, multi-wavelength Brillouin laser, dual wavelength fibre laser, light modulation.Said method is having bottleneck aspect high-frequency, tunable, high stability.And multi-wavelength Brillouin fiber laser because of its super-narrow line width, fixing Brillouin shift interval, high stability be the comparatively Perfected process that produces high-frequency microwave signal.
Based on the microwave signal source of Brillouin's multi-wavelength optical fiber laser, the method for mostly utilizing the method for light splitting to realize a road pump light and another road stokes light beat frequency realizes high-frequency microwave signal.In these class methods, produce the threshold value that the stokes light Yi road monomode fiber of several kilometers reduces Brillouin and realize multi-wavelength output, and multiwavelength laser moves under many longitudinal modes state in the case, bring the defect of strong noise and wide live width to thus beat frequency microwave signal, the wide live width and the strong noise microwave signal that obtain thus do not have practical value.In the process that realizes high-frequency microwave signal, need to filter with the Fiber Bragg Grating FBG of super-narrow line width this holder Coase light of Brillouin shift simultaneously, make installation cost high.Therefore realize that low noise, narrow linewidth, high power, cost are low, the simple high-frequency microwave signal of system is very important work.
Chinese patent " utilizes multi-wavelength Brillouin laser to produce the apparatus and method of microwave signal ", and publication number is CN101807773, and as shown in Figure 1, this apparatus structure is as follows:
Adjustable narrow-band light source 1 is connected with the input light of the first isolator 2, the output of the first isolator 2 is connected with the port optical of the single port of the one or three port coupler 3, a port of the dual-port end of the one or three port coupler 3 is connected with a port optical of the dual-port of the two or three port coupler 4, and another port of the dual-port end of the one or three port coupler 3 is connected with a port optical of four port coupler 12 one end;
The port of the single port end of the two or three port coupler 4 is connected with 1 mouthful of light of the first fiber optical circulator 7,3 mouthfuls of the first fiber optical circulator 7 are connected with the input light of erbium-doped fiber amplifier 6, the output of Erbium-Doped Fiber Amplifier 6 is connected with the input light of the second isolator 5, and the second isolator 5 outputs are connected with another port optical of the dual-port of the two or three port coupler 4;
2 mouthfuls of the first fiber optical circulator 7 are connected with one end light of monomode fiber 8, the other end of monomode fiber 8 is connected with Sagnac annular mirror 9 input light, Sagnac annular mirror 9 outputs are connected with 1 mouthful of light of the second fiber optical circulator 10,2 ports of the second fiber optical circulator 10 are connected with Fiber Bragg Grating FBG 11 light, 3 mouthfuls of the second fiber optical circulator 10 are connected with another port optical of four port coupler 12 one end, and a port of four port coupler 12 other ends is connected with the input light of light end detector 13.
This technical scheme adopts adjustable narrow-band laser, and pump light is divided into two-way pump light after by isolator and coupler, and a road pump light carries out beat frequency with another road pump light and obtains high-frequency microwave signal after 10km monomode fiber produces multistage stokes light.But the 10km highly nonlinear optical fiber adopting makes, resonator is long to be increased, and longitudinal mode spacing and chamber grow up to inverse ratio, so along with the minimizing of longitudinal mode spacing, to there is many longitudinal modes running status brillouin gain spectrum (being about 20MHz) is inner, the microwave signal that produces thus wide live width and strong noise does not have practical value, and the optical fiber of 10km uses the volume of aggrandizement apparatus to be unfavorable for miniaturization.Stokes light has the frequency of 11GHz to move down with respect to pump light in addition, filters out and is spaced apart 11GHz(0.08nm) stokes light often need live width to be less than the super narrow band fiber Bragg grating of 0.08nm.This has increased cost and the system complex degree of device to a certain extent.
Summary of the invention
The present invention solves the high problem of wide live width, strong noise, system complex, cost that in prior art, the microwave signal source based on Brillouin laser exists, and has proposed the super-narrow line width adjustable microwave signal source based on double Brillouin shift interval single frequency optical fiber laser.
Technical scheme of the present invention: super-narrow line width adjustable microwave signal source, it comprises adjustable narrow linewidth Brillouin's pump laser, erbium-doped fiber amplifier, the one or three port coupler, Polarization Controller, circulator, highly nonlinear optical fiber, four port coupler, Fiber Bragg Grating FBG, adjustable optical attenuator, the two or three port coupler, photodetector, electric frequency spectrograph; It is characterized in that,
Importation: adjustable narrow linewidth Brillouin's pump laser, it exports pump light;
Erbium-doped fiber amplifier, it amplifies described pump light the threshold value that arrives the needed Brillouin scattering of highly nonlinear optical fiber;
The one or three port coupler, it is divided into two the pump light after amplifying, and enters single-frequency dual wavelength generating portion;
Single-frequency dual wavelength generating portion:
Pump light is after the one or three port coupler, and most of pump light enters four port coupler through Polarization Controller and circulator; Fraction pump light arrives the two or three port coupler through adjustable optical attenuator;
A pump light part that enters four port coupler enters highly nonlinear optical fiber and excites the first reverse rank stokes light, and another part is directly from doing the port output of oblique angle processing;
The first rank stokes light is exported through circulator through four port coupler parts, another part enters highly nonlinear optical fiber and excites reverse second-order stokes light, second-order stokes light enters highly nonlinear optical fiber through four port coupler parts and excites the 3rd reverse rank stokes light, and another part is directly from doing the port output of oblique angle processing; Repetitive cycling thus, the port that pump light and even-order stokes light do oblique angle processing by four port coupler is exported, and odd-order stokes light arrives the two or three port coupler after circulator and Fiber Bragg Grating FBG filtration;
Dual wavelength beat frequency part: obtain dual-wavelength laser output and arrive photodetector and carry out beat frequency and obtain through the two or three port coupler the microwave signal of narrow linewidth high frequency by single-frequency dual wavelength generating portion, finally measure gained microwave signal by electric frequency spectrograph.
The invention has the beneficial effects as follows:
The present invention improves pumping light power after erbium-doped fiber amplifier is put into pump light source, meets and reduces required Brillouin threshold because chamber is long, for the operation of laser single mode provides condition.Then Brillouin chamber is designed to the standard 8 word loop types that four port coupler connect highly nonlinear optical fiber, two-port connects highly nonlinear optical fiber, one port is input/output terminal, and another port is oblique angle processing, and this structure will realize the Laser output at double Brillouin shift interval.
The present invention adopts 10m highly nonlinear optical fiber as gain media, has reduced resonator long, makes longitudinal mode spacing close with brillouin gain spectrum, thereby realizes the operation of Brillouin laser single longitudinal mode, has reduced the volume installing, easily miniaturization with this simultaneously.
Brillouin of the present invention chamber adopts accurate 8 word loop types, using 10m highly nonlinear optical fiber as gain media, realize the single-frequency laser output at double Brillouin shift interval, and realize the output of the adjustable high-frequency microwave signal of frequency by high-speed photodetector, 3dB live width is in kHz rank, and multilongitudianl-mode laser beat frequency gained live width is in MHz rank.So compare the existing microwave signal source based on multi-wavelength Brillouin laser, the live width of microwave signal has significantly lifting, reaches real requirement.Than the Laser output at single times of Brillouin shift interval, the present invention has removed the optical fiber Brillouin grating of super-narrow line width, has reduced use cost in addition, and structure of the present invention is compacter, simple, is easy to encapsulation.The present invention will have larger application potential in radio communication, Microwave photonics field.
Accompanying drawing explanation
Fig. 1 is that prior art utilizes multi-wavelength Brillouin laser to produce the schematic diagram of the device of microwave signal.
Fig. 2 is the schematic diagram in super-narrow line width adjustable microwave signal of the present invention source.
Fig. 3 is the laser light spectrogram at the different Brillouin shifts of the invention process interval.
Fig. 4 is the microwave signal spectrogram of the invention process different frequency.
Fig. 5 is the microwave signal live width resolution chart of the invention process 21.39GHz.
Fig. 6 is microwave signal frequency and the power variation diagram of the invention process 21.39GHz.
Embodiment
Below in conjunction with accompanying drawing, the embodiment of the present invention is elaborated.
As shown in Figure 2, super-narrow line width adjustable microwave signal source, it comprises adjustable narrow linewidth Brillouin's pump laser 16, erbium-doped fiber amplifier the 17, the 1 port coupler 18, polarization state controller 19, circulator 20, highly nonlinear optical fiber 21, four port coupler 22, Fiber Bragg Grating FBG 23, adjustable optical attenuator the 24, the 23 port coupler 25, photodetector 26 and electric frequency spectrograph 27.This signal source structure can be divided into three parts, i.e. importation, single-frequency dual wavelength generating portion, dual wavelength beat frequency part.
Importation: this part is connected successively by adjustable narrow linewidth Brillouin's pump laser 16, erbium-doped fiber amplifier 17 and the one or three port coupler 18.
Adjustable narrow linewidth Brillouin's pump laser 16, it exports pump light;
Erbium-doped fiber amplifier 17, it amplifies described pump light the threshold value that arrives highly nonlinear optical fiber 21 needed Brillouin scatterings;
The one or three port coupler 18, it is divided into two the pump light after amplifying, and enters single-frequency dual wavelength generating portion.
Single-frequency dual wavelength generating portion:
Pump light is after the one or three port coupler 18, and a part of pump light enters four port coupler 22 through polarization state controller 19 and circulator 20.Another part pump light arrives the two or three port coupler 25 through adjustable optical attenuator 24.A pump light part that enters four port coupler 22 enters highly nonlinear optical fiber 21 and excites the first reverse rank stokes light, and another part is directly from doing the port output of oblique angle processing.The first rank stokes light is exported through circulator 20 through four port coupler 22 parts, another part enters highly nonlinear optical fiber 21 and excites reverse second-order stokes light, second-order stokes light enters highly nonlinear optical fiber 21 through four port coupler 22 parts and excites the 3rd reverse rank stokes light, and another part is directly from doing the port output of oblique angle processing.Repetitive cycling thus, pump light and even-order stokes light are exported by the port that does oblique angle processing, and odd-order stokes light arrives the two or three port 25 devices that are coupled after circulator 20 and Fiber Bragg Grating FBG 23 filters.
Dual wavelength beat frequency part: obtain dual-wavelength laser output and arrive photodetector 26 and carry out beat frequency and obtain through the two or three port coupler 25 microwave signal of narrow linewidth high frequency by single-frequency dual wavelength generating portion, finally measure gained microwave signal by electric frequency spectrograph 27.
Embodiment: to realize 10GHz to the beat frequency of 40GHz microwave signal as example.
Realize 10GHz microwave signal: first regulate adjustable narrow linewidth Brillouin's pump laser 16, make the wavelength of pumping laser away from the centre wavelength of Fiber Bragg Grating FBG, prevent filtered; Secondly regulating Polarization Controller 19 to realize output stokes light number is 1.What now exported by the two or three port coupler 25 is pump light and the first stokes light, as Fig. 3 a.What beat frequency obtained thus is the microwave signal of 10GHz, as Fig. 4 a.
Realize 20GHz microwave signal: first regulate adjustable narrow linewidth Brillouin's pump laser 16, make the wavelength of pumping laser away from the centre wavelength of Fiber Bragg Grating FBG, prevent filtered; Secondly regulating Polarization Controller 19 to realize output stokes light number is 2.Regulate adjustable optical attenuator 24 decay maximum, what now exported by the two or three port coupler 25 is the 3rd stokes light and the first stokes light, as Fig. 3 b.What beat frequency obtained thus is the microwave signal of 20GHz, as Fig. 4 b.
Realize 30GHz microwave signal: first regulate adjustable narrow linewidth Brillouin's pump laser 16, make the wavelength of pumping laser make the first stokes light aim at the centre wavelength of Fiber Bragg Grating FBG; Secondly regulating Polarization Controller 19 to realize output stokes light number is 2.What now exported by the two or three port coupler 25 is pump light and the 3rd stokes light, as Fig. 3 c.What beat frequency obtained thus is the microwave signal of 30GHz, as Fig. 4 c.
Realize 40GHz microwave signal: first regulate adjustable narrow linewidth Brillouin's pump laser 16, make the wavelength of pumping laser make the 3rd stokes light aim at the centre wavelength of Fiber Bragg Grating FBG; Secondly regulating Polarization Controller 19 to realize output stokes light number is 3.Regulate adjustable optical attenuator 24 decay maximum, what now exported by the two or three port coupler 25 is the first stokes light and the 5th stokes light, as Fig. 3 d.What beat frequency obtained thus is the microwave signal of 40GHz, as Fig. 4 d.
Regulate as from the foregoing the wavelength of Polarization Controller 19 and adjustable narrow linewidth Brillouin's pump laser 16 can select to be spaced apart the dual wavelength output of different Brillouin shifts, thereby realize the microwave signal output of high-frequency tunable.
The principle of utilizing apparatus of the present invention to realize the output of generation single longitudinal mode laser is:
Brillouin's longitudinal mode spacing (FSR) grows up to inverse ratio with chamber,
In formula, c is light speed in a vacuum, the effective refractive index that N is optical fiber, and the chamber that L is resonant cavity is long, and therefore in the time that Brillouin chamber length is 10m left and right, FSR=20MHz is close with the wide 20MHz of brillouin gain bands of a spectrum, realizes single longitudinal mode output.When fiber lengths is during much larger than 10m, will be many longitudinal modes outputs.So the microwave signal that traditional many longitudinal modes dual-wavelength laser beat frequency obtains will significantly reduce particularly live width of signal performance, and not reach real requirement.
Adjustable narrow linewidth Brillouin laser 16 wavelength that the present invention adopts are 1550.12nm, and live width is less than 5Hz.The one or three port coupler the 18 and the 23 port coupler 25 is 1 × 2 three-dB coupler; The coupler that four port coupler 22 are 2 × 2, its splitting ratio is 6:4; The length of highly nonlinear optical fiber 21 is 10m.Polarization Controller 19 is extruding optical fiber type Polarization Controller.Circulator 20 is three-port circulator.Fiber Bragg Grating FBG 23 is reflective gratings, and three dB bandwidth is 0.3nm, and reflectivity is 97%.Photodetector 26 is the following microwave signal of the detectable 70GHz of high speed detector.Electricity frequency spectrograph 27 is the following microwave signal of the detectable 44GHz of high speed frequency spectrograph.The optical fibre device adopting is protects inclined to one side device.
Open adjustable narrow linewidth Brillouin's pumping 16, regulate the wavelength of high power narrow linewidth Brillouin pumping.10m highly nonlinear optical fiber 21 produces stokes light under the effect of pump light, by regulating pumping light wavelength and Polarization Controller 19 and adjustable optical attenuator 24 can realize the dual wavelength output at different Brillouin shifts interval.
If Fig. 5 is 21.39GHz live width test case, obtains 3dB live width by conversion and be approximately less than 10kHz.Live width is far smaller than the MHz rank of the microwave signal source of tradition based on Brillouin laser.
If Fig. 6 is 21.39GHz microwave signal source frequency and power situation of change in 60 minutes, visible frequency and power stability are good, float be less than ± 0.4MHz, be less than ± 0.75dB of power frequently.
The present invention can obtain super-narrow line width tunable high-frequency microwave signals source, along with the development of various photoelectric devices, will obtain that frequency is higher, more narrow linewidth, more stable output, and its application also will be more extensive.
Above described embodiment of the present invention and principle are had been described in detail, for those of ordinary skill in the art, according to thought provided by the invention, in embodiment, will change, and these changes also should be considered as protection scope of the present invention.
Claims (7)
1. super-narrow line width adjustable microwave signal source, it comprises adjustable narrow linewidth Brillouin's pump laser (16), erbium-doped fiber amplifier (17), the one or three port coupler (18), Polarization Controller (19), circulator (20), highly nonlinear optical fiber (21), four port coupler (22), Fiber Bragg Grating FBG (23), adjustable optical attenuator (24), the two or three port coupler (25), photodetector (26), electric frequency spectrograph (27); It is characterized in that,
Importation: adjustable narrow linewidth Brillouin's pump laser (16), it exports pump light;
Erbium-doped fiber amplifier (17), it amplifies described pump light the threshold value that arrives the needed Brillouin scattering of highly nonlinear optical fiber (21);
The one or three port coupler (18), it is divided into two the pump light after amplifying, and enters single-frequency dual wavelength generating portion;
Single-frequency dual wavelength generating portion:
Pump light is after the one or three port coupler (18), and most of pump light enters four port coupler (22) through Polarization Controller (19) and circulator (20); Fraction pump light arrives the two or three port coupler (25) through adjustable optical attenuator (24);
A pump light part that enters four port coupler (22) enters highly nonlinear optical fiber (21) and excites the first reverse rank stokes light, and another part is directly from doing the port output of oblique angle processing;
The first rank stokes light is exported through circulator (20) through four port coupler (22) part, another part enters highly nonlinear optical fiber (21) and excites reverse second-order stokes light, second-order stokes light enters highly nonlinear optical fiber (21) through four port coupler (22) part and excites the 3rd reverse rank stokes light, and another part is directly from doing the port output of oblique angle processing; Repetitive cycling thus, pump light and even-order stokes light are done the port output of oblique angle processing by four port coupler (22), and odd-order stokes light arrives the two or three port coupling (25) device after circulator (20) and Fiber Bragg Grating FBG (23) filtration;
Dual wavelength beat frequency part: obtain dual-wavelength laser output and arrive photodetector (26) and carry out beat frequency and obtain through the two or three port coupler (25) microwave signal of narrow linewidth high frequency by single-frequency dual wavelength generating portion, finally measure gained microwave signal by electric frequency spectrograph (27).
2. the super-narrow line width adjustable microwave signal source based on double Brillouin shift interval single frequency optical fiber laser according to claim 1, it is characterized in that, the Brillouin chamber of the accurate 8-shaped being formed by circulator (20), four port coupler (22), highly nonlinear optical fiber (21), wherein four port coupler (22) wherein a port do oblique angle processing, the Brillouin chamber of this accurate 8-shaped can export the stokes light of odd-order and suppress pump light and even-order stokes light in chamber.
3. super-narrow line width adjustable microwave signal according to claim 1 source, is characterized in that, described adjustable narrow linewidth Brillouin's pump laser wavelength is 1550.012nm, and live width is less than 5kHz.
4. super-narrow line width adjustable microwave signal according to claim 1 source, is characterized in that, described highly nonlinear optical fiber (21) length is 10m, meets the condition of Brillouin laser single longitudinal mode output.
5. super-narrow line width adjustable microwave signal according to claim 1 source, is characterized in that, described Fiber Bragg Grating FBG (23) is reflective gratings, and 3dB live width is 0.3nm, and reflectivity is greater than 97%.
6. super-narrow line width adjustable microwave signal according to claim 1 source, is characterized in that, described photodetector (26) and electric frequency spectrograph (27) are for being applicable to high-frequency measuring instrument.
7. super-narrow line width adjustable microwave signal according to claim 1 source, is characterized in that, described optical fibre device is protects inclined to one side device.
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| CN104051955B (en) * | 2014-06-26 | 2017-01-25 | 中国科学院半导体研究所 | Tunable photoproduction microwave source based on semiconductor double-module laser |
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| CN107579776A (en) * | 2017-09-21 | 2018-01-12 | 成都驹月科技有限公司 | Optical fiber telecommunications system based on free space |
| CN108123359A (en) * | 2017-12-01 | 2018-06-05 | 中国科学院国家授时中心 | Super stabilized laser device and the method for reducing the super stabilized laser device thermal noise limit |
| 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 |
| 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 |
| CN111555099A (en) * | 2020-06-15 | 2020-08-18 | 南京大学 | Microwave generating system |
| CN111834883A (en) * | 2020-07-20 | 2020-10-27 | 桂林电子科技大学 | Photo-generated microwave signal source |
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| CN114447750A (en) * | 2021-12-23 | 2022-05-06 | 香港理工大学深圳研究院 | Microwave signal generation method and system based on microcavity feedback locked laser |
| CN114447750B (en) * | 2021-12-23 | 2024-01-09 | 香港理工大学深圳研究院 | Microwave signal generation method and system based on microcavity feedback locking laser |
| CN115102023A (en) * | 2022-08-26 | 2022-09-23 | 苏州大学 | Frequency shift injection locking ultra-narrow linewidth Brillouin laser and system |
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