CN104022428A - Microwave signal source with narrow line width and high signal-to-noise ratio - Google Patents
Microwave signal source with narrow line width and high signal-to-noise ratio Download PDFInfo
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Abstract
The invention belongs to the field of photoelectron and microwave photonics, and discloses a microwave signal source with a narrow line width and a high signal-to-noise ratio, for solving the problems of wide line width and high noise existing in the prior art. Pump light enters a first four-port coupler through a polarization controller and a first circulator, and a part of the pump light enters a common single-mode fiber to excite reversely transmitted first-order Stokes light; the other part of the pump light enters a light reflection mirror composed of a second circulator and a polarization-maintaining Er-doped fiber through the first four-port coupler and a micro-ring structure composed of a second four-port coupler, returns to the micro-ring structure through the light reflection mirror and enters a Brillouin gain cavity composed of the first four-port coupler and the common single-mode fiber; a part of returned pump light enters the common single-mode fiber to excite reversely transmitted next-order Stokes light, and the other part enters the first circulator and then enters a coupler; and a part of signal light passing through the coupler enters a spectrum analyzer, and the other part enters a photoelectric detector for photoelectric conversion and then enters a frequency spectrum analyzer.
Description
Technical field
The invention belongs to photoelectron and Microwave photonics field, relate to the microwave signal source of narrow linewidth high s/n ratio, the present invention is applied to wireless communication field.
Background technology
Be accompanied by the fast development of mobile communication, existing radio spectrum resources cannot meet the business demand day by day increasing, and for solving the problem of radio spectrum resources scarcity, light carrier radio communication (ROF) was by what people proposed.Light carrier radio communication is the technology that a kind of light and microwave/millimeter wave combine, and microwave signal, because having very low phase noise, super-narrow line width, the high advantage such as stability, anti-electromagnetic interference, is considered to one of key technology affecting ROF systematic function.The method that produces at present microwave mainly contain utilize bragg grating to, utilize chirped fiber Brig grating, utilize Mach-Zehnder interferometer, utilize tunable narrow linewidth filter etc., the dual wavelength Brillouin optical fiber laser that utilizes brillouin effect to produce becomes the focus of recent research.
Mostly adopt at present wavelength selective filters to realize the interval output of wavelength, but this limit its application greatly.Because dual wavelength fibre laser has stable wavelength interval; also can be for generation of microwave signal; but the erbium-doped fiber amplifier in dual wavelength fibre laser (EDFA) can increase the live width of phase noise and expansion microwave signal conventionally, and the limit mould of dual wavelength fibre laser also can affect the quality of output signal.The present invention utilizes stimulated Brillouin scattering effect to propose the dual wavelength Brillouin optical fiber laser of a kind of single times of interval output, utilize super-narrow line width fiber laser as Brillouin's pumping source, the present invention does not use erbium-doped fiber amplifier and wavelength selective filters, the fiber laser of super-narrow line width also can effectively reduce and produce the live width of microwave signal as Brillouin's pumping source, in structure, added simultaneously micro-ring structure and saturated absorbing body for the shaping of signal, narrow live width and absorption of noise.
Article open " Tunable microwave generation based on a Brillouin fiber ring laser and reflected pump ", it is that the people such as Xinhuan Feng are published in 2011 (43) optics & Laser Technology, as shown in Figure 1, this apparatus structure is as follows:
Live width is that the tunable laser 1 of 500KHz is as Brillouin's pumping source, first amplify through Er-doped fiber 2, amplifying for the second time through erbium-ytterbium co-doped fiber 3, flashlight after amplification enters circulator 5 after by Polarization Controller 4, enter by circulator 5 coupler 6 that splitting ratio is 9:1, one or three ports of coupler 6 connect a segment length and are about the general single mode fiber 7 of 20 meters as brillouin gain medium, coupler 8 connects one section of general single mode fiber 9 as speculum, so that flashlight refills brillouin gain ring.
The tunable laser that this technical scheme employing live width is 500KHz is as Brillouin's pumping source, through the amplification successively of Er-doped fiber and erbium-ytterbium co-doped fiber, enter brillouin gain ring, in 20m monomode fiber, produce the stokes light of reverse transfer, thereby produce the dual wavelength fibre laser being formed by light source and stokes light, the dual wavelength of output is carried out to opto-electronic conversion and obtain microwave signal.The tunable laser that this experiment employing live width is 500KHz is as Brillouin's pumping source, pass through again the amplification successively of Er-doped fiber and erbium-ytterbium co-doped fiber, obtaining live width is the microwave signal that 600KHz and signal to noise ratio are 40dB, do not have practical value, Er-doped fiber amplifies and the volume of erbium-ytterbium co-doped fiber amplification meeting aggrandizement apparatus is unfavorable for miniaturization and has increased cost and the system complex degree of installing.
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 microwave signal source of the narrow linewidth high s/n ratio based on Brillouin shift interval single frequency optical fiber laser.
Technical scheme of the present invention: the microwave signal source of narrow linewidth high s/n ratio, it comprises super-narrow line width fiber laser, Polarization Controller, the first circulator, the one or four port coupler, general single mode fiber, the two or four port coupler, the second circulator, protects inclined to one side Er-doped fiber, three port coupler, spectroanalysis instrument photodetector, electric spectrum analyzer; It is characterized in that, comprise following structure,
Importation:
Super-narrow line width fiber laser, it exports pump light;
Pump light enters single-frequency dual wavelength generating portion by Polarization Controller and the first circulator;
Single-frequency dual wavelength generating portion:
Pump light enters the one or four port coupler by Polarization Controller and the first circulator, part pump light is entered general single mode fiber and is excited the first rank stokes light of reverse transfer by the one or four port coupler, another part pump light is entered the second circulator and is protected the light reflection mirror that inclined to one side Er-doped fiber forms by the one or four port coupler and micro-ring structure of being made up of the two or four port coupler, pump light returns to the micro-ring structure being made up of the two or four port coupler after by light reflection mirror and enters the brillouin gain chamber being made up of the one or four port coupler and general single mode fiber, a pump light part of returning enters general single mode fiber and excites the lower single order stokes light of reverse transfer, another part enters coupler after entering the first circulator again, entering spectroanalysis instrument by a flashlight part for coupler observes, another part enters photodetector to carry out entering spectrum analyzer after opto-electronic conversion and observes, if the reverse transfer stokes light being produced by pump light meets threshold condition and can again enter brillouin gain ring as pump light and excite its lower single order stokes light, this process continues to carry out until can not meet Brillouin threshold condition,
Dual wavelength beat frequency part: obtain dual-wavelength laser output and arrive photodetectors and carry out beat frequency and obtain through 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 does not adopt Er-doped fiber structure for amplifying, has effectively avoided the broadening of microwave signal, simultaneously by adding ring structure and saturated absorbing body in a subtle way, can be effectively for the shaping of signal, narrow live width and absorption of noise.Designed structure, by regulating Polarization Controller, produces the high dual-wavelength laser output signal of signal to noise ratio, by the high dual wavelength output signal of signal to noise ratio is carried out to opto-electronic conversion, thereby obtains the microwave signal output that signal to noise ratio is high.
The present invention adopts 10m general single mode fiber as gain media, reduce resonator long, make longitudinal mode spacing close with brillouin gain spectrum, thereby realize the operation of Brillouin laser single longitudinal mode, the live width of the microwave signal obtaining is in 10kHz, also reduced the volume of device, easily miniaturization simultaneously.
In structure of the present invention, selecting 10m monomode fiber is the result through design optimization: if monomode fiber is greater than 10m, longitudinal mode spacing is less than brillouin gain spectrum, will occur the output of many longitudinal modes light; If monomode fiber is less than 10m, the pump power in structure according to the present invention, can not provide stable dual wavelength Brillouin laser.
Brillouin of the present invention chamber adopts accurate 8 word loop types, using 10m general single mode fiber as gain media, realize the single-frequency laser output at Brillouin shift interval, and realize the output of high-frequency microwave signal by high-speed photodetector, 3dB live width is in 10kHz, more than signal to noise ratio 50dB, and multilongitudianl-mode laser beat frequency gained live width is in MHz rank, the present invention simultaneously in structure, add ring structure and saturated absorbing body in a subtle way for the shaping of signal, narrow live width and absorption of noise.So compare the existing microwave signal source based on multi-wavelength Brillouin laser, the quality of microwave signal has significantly lifting, reaches real requirement.The designed structure of the present invention can produce the dual-wavelength laser output signal that signal to noise ratio is very high in addition, and the microwave signal obtaining by beat frequency also has the dry ratio of very high letter, 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.
Brief description of the drawings
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 structural representation of the microwave signal source of narrow linewidth high s/n ratio of the present invention.
Fig. 3 is the Brillouin shift interval laser light spectrogram of the invention process interval 0.0858nm.
Fig. 4 is the microwave signal spectrogram of the invention process 10.707GHz.
Fig. 5 is the microwave signal live width resolution chart of the invention process 10.707GHz.
Fig. 6 is microwave signal frequency and the power variation diagram of the invention process 10.707GHz.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further details.
As shown in Figure 2, the microwave signal source of narrow linewidth high s/n ratio, it comprises super-narrow line width fiber laser 11, Polarization Controller 12, the first circulator the 13, the 1 port coupler 14, general single mode fiber the 15, the 24 port coupler 16, the second circulator 17, protects inclined to one side Er-doped fiber 18, three port coupler 19, photodetector 20, electric frequency spectrograph 21 and spectroanalysis instrument 22.This signal source structure can be divided into three parts, i.e. importation, single-frequency dual wavelength generating portion and dual wavelength beat frequency part.
Importation: super-narrow line width fiber laser 11, it exports pump light.
Pump light enters single-frequency dual wavelength generating portion by Polarization Controller 12 and the first circulator 13.
Single-frequency dual wavelength generating portion.
Pump light enters the port a of the first circulator 13 by Polarization Controller 12, enter the one or four port coupler 14 by port d again, part pump light is entered general single mode fiber 15 and is excited the first rank stokes light of reverse transfer by the e port of the one or four port coupler 14 and f port, another part pump light is entered the second circulator 17 and is protected the light reflection mirror that inclined to one side Er-doped fiber 18 forms by port h by the port g of the one or four port coupler 14 and micro-ring structure of being made up of the two or four port coupler 16, pump light returns to the micro-ring structure being made up of the two or four port coupler 16 after by light reflection mirror and again enters by port g the brillouin gain chamber being made up of the one or four port coupler 14 and general single mode fiber 15, a pump light part of returning from port f enter general single mode fiber excite reverse transfer single order stokes light, another part is from port d outgoing, enter the first circulator 13 by port b, and enter coupler 19 by port c output by port k, entering spectroanalysis instrument by a flashlight part for coupler 19 from port l observes, another part enters photodetector 20 from port m to carry out entering spectrum analyzer 21 opto-electronic conversion and observes, if the reverse transfer stokes light being produced by pump light meets threshold condition and can again enter brillouin gain ring as pump light and excite its lower single order stokes light, this process continues to carry out until can not meet Brillouin threshold condition.
Dual wavelength beat frequency part: obtain dual-wavelength laser by single-frequency dual wavelength generating portion, as shown in Figure 3, the wavelength interval 0.0858nm of dual-wavelength laser, output arrives photodetector 20 and carries out beat frequency and obtain the microwave signal of narrow linewidth high frequency through three port coupler 19, finally measure gained microwave signal by electric frequency spectrograph 21, Fig. 4 is the microwave signal frequency spectrum of the 10.707GHz of beat frequency acquisition.
Narrow cable and wide optical fiber laser 1 wavelength that the present invention adopts is 1550.08nm, and live width is less than 1kHz.The one or four port coupler the 14 and the 24 port coupler 16 is 2 × 2 three-dB coupler; The three-dB coupler that three port coupler 19 are 1 × 2; The length of general single mode fiber 15 is 10m.The length of protecting inclined to one side Er-doped fiber 18 is 4m.Polarization Controller 12 is extruding optical fiber type Polarization Controller.The first circulator 13 and the second circulator 17 are three-port circulator.Spectroanalysis instrument 22 is high resolution spectrometer, and Observable 600nm is to the scope of 1700nm.Photodetector 20 is the following microwave signal of the detectable 60GHz of high speed detector.Electricity frequency spectrograph 21 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 super-narrow line width fiber laser 11 as pumping source, 10m general single mode fiber 15 produces the stokes light of reverse transfer under the effect of pump light, by regulating Polarization Controller 12 can realize the dual wavelength output at single times of frequency displacement interval.
If Fig. 5 is 10.707GHz live width test case, obtain 3dB live width by conversion and be about 8.6kHz, signal to noise ratio is 50dB.Live width is far smaller than the MHz rank of the microwave signal source of tradition based on Brillouin laser.
If Fig. 6 is 10.707GHz microwave signal source frequency and power situation of change in 60 minutes, visible frequency and power stability are good, float be less than ± 0.3MHz, be less than ± 0.45dB of power frequently.
The present invention can obtain super-narrow line width high-frequency microwave signal 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.
Claims (8)
1. the microwave signal source of narrow linewidth high s/n ratio, is characterized in that, comprises following structure,
Importation:
Super-narrow line width fiber laser (11), it exports pump light;
Pump light enters single-frequency dual wavelength generating portion by Polarization Controller (12) and the first circulator (13);
Single-frequency dual wavelength generating portion:
Pump light enters the one or four port coupler (14) by Polarization Controller (12) and the first circulator (13), part pump light is entered general single mode fiber (15) and is excited the first rank stokes light of reverse transfer by the one or four port coupler (14), another part pump light is entered the second circulator (17) and is protected the light reflection mirror that inclined to one side Er-doped fiber (18) forms by the one or four port coupler (14) and micro-ring structure of being made up of the two or four port coupler (16), pump light returns to the micro-ring structure being made up of the two or four port coupler (16) after by light reflection mirror and enters the brillouin gain chamber being made up of the one or four port coupler (14) and general single mode fiber (15), a pump light part of returning enters general single mode fiber and excites the lower single order stokes light of reverse transfer, another part enters coupler (19) after entering the first circulator (13) again, entering spectroanalysis instrument by a flashlight part for coupler (19) observes, another part enters photodetector (20) to carry out entering spectrum analyzer (21) after opto-electronic conversion and observes, if the reverse transfer stokes light being produced by pump light meets threshold condition and can again enter brillouin gain ring as pump light and excite its lower single order stokes light, this process continues to carry out until can not meet Brillouin threshold condition,
Dual wavelength beat frequency part: obtain dual-wavelength laser output and arrive photodetectors (20) and carry out beat frequency and obtain through three port coupler (19) microwave signal of narrow linewidth high frequency by single-frequency dual wavelength generating portion, finally measure gained microwave signal by electric frequency spectrograph (21).
2. the microwave signal source of narrow linewidth high s/n ratio according to claim 1, is characterized in that, super-narrow line width fiber laser (11) wavelength is 1550.08nm, and live width is less than 1kHz.
3. the microwave signal source of narrow linewidth high s/n ratio according to claim 1, is characterized in that, the one or four port coupler (14) and the two or four port coupler (16) are 2 × 2 three-dB coupler; The three-dB coupler that three port coupler (19) are 1 × 2.
4. the microwave signal source of narrow linewidth high s/n ratio according to claim 1, is characterized in that, the length of general single mode fiber (15) is 10m; The length of protecting inclined to one side Er-doped fiber (18) is 4m.
5. the microwave signal source of narrow linewidth high s/n ratio according to claim 1, is characterized in that, Polarization Controller (12) is extruding optical fiber type Polarization Controller.
6. the microwave signal source of narrow linewidth high s/n ratio according to claim 1, is characterized in that, the first circulator (13) and the second circulator (17) are three-port circulator.
7. the microwave signal source of narrow linewidth high s/n ratio according to claim 1, is characterized in that, photodetector (20) is the following microwave signal of the detectable 60GHz of high speed detector; Electricity frequency spectrograph (21) is the following microwave signal of the detectable 44GHz of high speed frequency spectrograph.
8. the microwave signal source of narrow linewidth high s/n ratio according to claim 1, is characterized in that, the optical fibre device adopting is protects inclined to one side device.
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Cited By (5)
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| CN106911061A (en) * | 2017-04-07 | 2017-06-30 | 长春理工大学 | Tunable Brillouin's Raman multi-wavelength optical fiber laser |
| 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 |
| CN110571627A (en) * | 2019-08-12 | 2019-12-13 | 浙江大学 | Passive compensation mode-based photoelectric oscillator with stable frequency and method thereof |
| CN112290357A (en) * | 2020-09-27 | 2021-01-29 | 上海航天控制技术研究所 | Ultra-narrow linewidth high-frequency microwave signal generating device |
| CN114244444A (en) * | 2021-12-16 | 2022-03-25 | 武汉光谷信息光电子创新中心有限公司 | On-chip device and microwave signal generation method thereof |
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| CN114244444A (en) * | 2021-12-16 | 2022-03-25 | 武汉光谷信息光电子创新中心有限公司 | On-chip device and microwave signal generation method thereof |
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