CN100536261C - Device for single polarization dual-wavelength fiber grating laser to generate microwave, millimeter wave - Google Patents
Device for single polarization dual-wavelength fiber grating laser to generate microwave, millimeter wave Download PDFInfo
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- CN100536261C CN100536261C CNB2007101770009A CN200710177000A CN100536261C CN 100536261 C CN100536261 C CN 100536261C CN B2007101770009 A CNB2007101770009 A CN B2007101770009A CN 200710177000 A CN200710177000 A CN 200710177000A CN 100536261 C CN100536261 C CN 100536261C
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Abstract
The invention discloses a device of single-polarization dual-wavelength fiber grating laser producing microwaves, millimeter-waves, which is characterized in that: the slot end (41) of a Y-divider on the device is connected with a polarization maintaining fiber grating (11); the output of the slot end terminal of the Y-divider is connected with a detector (51); a fork arm (42) of the Y-divider is connected with an active fiber (21); the other end of the active fiber is connected with a broadband fiber grating (12), and forms a resonant cavity with the polarization maintaining grating (11 ); a fork arm (43) of the Y-divider is connected with an active fiber (22), the other end of the active fiber (22) is connected with a broadband fiber grating (13), and forms the other resonant cavity with the polarization maintaining grating (11 ); the pumping lights (31) and (32) are coupled into the active fibers (21) and (22) by two couplers which are respectively on the back of the broadband fiber grating (12) and (13), and respectively generates single-polarized lasers, and enters the detector (51) through the fiber terminal (41), and difference frequency microwaves or millimeter-waves are produced in the detector.
Description
Technical field
The present invention relates to fields such as optical fiber microwave communication (RoF:Radio on/over Fiber), microwave photon, Fibre Optical Sensor, fiber laser, optical fiber communication and radar.Be applicable to and utilize single polarization dual-wavelength fiber grating laser to generate microwave, millimeter wave.
Background technology
The microwave photon technology is learned microwave and is in the same place with optical fusion, becomes a brand-new technology field, is commonly referred to Microwave Photonics (being called for short MWP).Opened a field mystery, full of hope in the development that is integrated in telecommunication of photon technology and microwave, millimeter wave.Optical tech merges mutually with electric wave technology, utilize the low-loss that optical fiber has, big capacity, non-inductive, in light weight, be easy to characteristics such as carrying, in traditional microwave technology, introduce optical tech, the basic network that can form information-intensive society, make full use of the wide bandwidth of optical fiber, wireless freedom, reach communication system multifunction and High Level that the continuous development of indivedual technology also can't realize, last 1 kilometer best solution route is provided.This is exactly the system of optical fiber communication and microwave communication combination optical fiber microwave communication (RoF:Radio on/over Fiber) in the connecting system of wireless/mobile communication system, in control of military antenna remote and intelligent transportation system.The RoF technology is used in wireless/mobile communication system, can focus on moving on to the base station controller end after the Base-Band Processing of base station end, modulation, the mixing function, and the base station end only keeps opto-electronic conversion, filtering and enlarging function, can reduce the cost of base station greatly like this, in the intensive microcellulor communication system in future, because base station number is numerous, adopt the RoF technology can reduce the cost of system greatly.The microwave optical fiber communication system, the microwave photon signal processing on the light territory.Handle based on the microwave signal of electronic equipment compared with tradition, the microwave photon signal processing has outside little, the tuning advantage easily of crosstalking of time-bandwidth product height, anti-electromagnetic interference, circuit and equipment room, the microwave photon signal processing technology is on the light territory microwave signal to be handled, it can with the natural coupling of RoF transmission system, the centre need not photoelectricity and electric light conversion equipment.The bandwidth constraints of electric treatment device the processing of photosignal of high bandwidth, replace electronics with photon, at higher rate processing signal, so just can avoid electronic bottleneck.Microwave photon has been concentrated the advantage of rf wave and optical fiber, the transparent translation between rf wave and optical fiber.Microwave provides low-cost mobile wireless connected mode, and optical fiber provides low damage broadband connection, and this connected mode is not subjected to the influence of electricity.In optical fiber, realize the logical transmission of band of rf wave, undamped, the phase mutual interference of no interchannel.
The light mode of millimeter-wave signal produces has very big attraction, because existing system all faces the frequency bandwidth problem of shortage.Needs to high speed data transfer are more and more urgent, the light mode production method of present multiple millimeter wave was proved already, and the light mode of millimeter wave produces its distinctive advantage: the low damage transmittability that the wide frequency domain carrier signal scope that can realize is connected with optical fiber.
Long-range erecting a television antenna, antenna is connected by optical fiber with receiver, and optical fiber replaces traditional coaxial cable, is called the light remote antenna.Its strong point is that antenna need not dispose amplifier, need not power, and the complete electric insulation of antenna and receiver is extremely gazed at as the electric-field sensor that EMC (Electro Magnetic Compatibility electromagnetic compatibility) uses.Some optical fiber and aerial array shape are arranged, and form the photocontrol array antenna, and control is to the amplitude and the phase place of the microwave signal of antenna transmission, and the electric wave beam that forms the antenna emission also carries out beam scanning.Compare to the method for antenna transmission microwave, millimeter wave with using coaxial cable, waveguide, the not only miniaturization of antenna periphery equipment, lightweight, and can also form more desirable electric wave beam, the phase control of microwave can adopt various light signal treatment technologies.
Optical fiber technology has been used for many years in phased array radar, and the operating frequency range of this class radar is for being not more than 18GHz at present, and just progressively expands to millimeter wave.Adopt the optical fiber microwave transmission to help isolating radiation array element in phased array radar, the relative phase of control array element is handled the echo-signal under the various electronic warfare environment.Yet putting into effect of this genus needs hundreds and thousands of microwave radiation array elements, even needs a lot of high frequency light electric devices.
Microwave can obtain by the analog circuit or the digital circuit in electric territory, and frequency is confined to be difficult to produce higher frequency microwave or millimeter wave below several GHz.
Optical means produces microwave, millimeter wave is the key technology that a microwave photon is learned.The conventional method of utilizing photoelectric technology to produce microwave frequency is based on two laser beams that tunable frequency is close, and this just requires laser to have extraordinary frequency stability.Another kind method is in the optics integrated circuit of complexity, frequency displacement rf modulations laser frequency, but this method only limit to produce low frequency signal (＜1GHz).Recently, studied the new method that much is used to produce microwave signal again: have the fiber optic loop resonant cavity as frequency modulator, utilize the Brillouin scattering effect of optical fiber to produce the microwave signal of phase modulated; Have the interference of adopting two or more solid-state microchip temperature and voltage tuning laser to produce dynamic-tuning, low noise microwave and millimeter wave signal, frequency from several GHz to 100GHz; There is the Bragg grating of employing to replace Mach-Zehnder interferometer, produces millimeter wave as filter; Also have based on the chromatic dispersion of non-Chirped Gaussian Pulses in transmission course and the microwave and millimeter wave of nonlinear effect generation complex frequency.These production methods, complex structure, poor stability, the efficient of generation is not high.
Summary of the invention
Deficiency for the method that overcomes existing microwave, millimeter wave electricity or optical means produce the invention provides a kind of device that utilizes single polarization dual-wavelength fiber grating laser to generate microwave, millimeter wave.
The objective of the invention is to be achieved through the following technical solutions.
The device of single polarization dual-wavelength fiber grating laser to generate microwave, millimeter wave, being connected between the device of its formation:
Divide a word termination of device to go into a polarization-maintaining fiber grating at Y, Y divides the output of a word end of device to be connected with detector;
Divide a bifurcated knee-joint of device to go into Active Optical Fiber at Y, at band optical fiber grating of other end access of Active Optical Fiber;
Divide another bifurcated knee-joint of device to go into Active Optical Fiber at Y, at band optical fiber grating of other end access of Active Optical Fiber;
Two band optical fiber grating reflection spectrums are spaced-apart, or more weak lap is arranged, the low at least 1dB of the reflectivity of the luminance factor polarization-maintaining fiber grating of its lap correspondence;
Utilize coupler that a pump light is coupled in the Active Optical Fiber in band optical fiber grating back;
Utilize coupler that another pump light is coupled in the Active Optical Fiber in band optical fiber grating back;
Two resonant cavitys of Active Optical Fiber, band optical fiber optical grating constitution on Active Optical Fiber, band optical fiber grating and polarization-maintaining fiber grating on polarization-maintaining fiber grating and the branch yoke and another minute yoke, under the effect of a pump light or another pump light, produce the laser of single polarization respectively, the laser of generation is exported the dual-wavelength laser of single polarization by optical fiber end;
The power of the dual wavelength list polarization laser that produces does not require identical, and its difference can be for being worth arbitrarily.
The single polarization dual-wavelength laser of output divides device to enter detector by Y; Dual-wavelength laser produces microwave or millimeter wave at the detector difference frequency.
Two Active Optical Fibers also can adopt protects inclined to one side Active Optical Fiber.Active Optical Fiber can or be mixed ytterbium or mix holmium or the ytterbium erbium is mixed or mixed thorium altogether or mixes praseodymium or neodymium-doped fiber for er-doped.
Y divides device also can adopt other fiber coupler.
It is 50: 50 or other any splitting ratio that Y divides the splitting ratio of device.Under other splitting ratio condition, the length that can be by changing Active Optical Fiber or the method for pump power guarantee to produce microwave or the millimeter wave demand to dual-wavelength laser power
Two band optical fiber gratings, the fiber grating that adopts common non-polarization maintaining optical fibre to make or adopt polarization maintaining optical fibre to make.
The length of Active Optical Fiber is decided according to doping content and pumping light power; Active Optical Fiber guarantees under given pump power, and the condition of resonance of selecting the gain of the resonant cavity that suitable Active Optical Fiber length and suitable doping content constitute to satisfy laser gets final product.Therefore the length of Active Optical Fiber is selected to be decided by pumping light power, active doping content and the loss that constitutes the chamber.
Two band optical fiber gratings, the fiber grating that adopts common non-polarization maintaining optical fibre to make or adopt polarization maintaining optical fibre to make; Length to fiber grating, polarization-maintaining fiber grating does not have specific (special) requirements.
Beneficial effect of the present invention:
Microwave can obtain by the analog circuit or the digital circuit in electric territory, but frequency is confined to be difficult to produce higher frequency microwave or millimeter wave below several GHz.Existing optical means produces the method for microwave or millimeter wave, complex structure, and poor stability, the efficient of generation is not high.
And the present invention adopts than protecting the much lower common Active Optical Fiber of inclined to one side Active Optical Fiber price as gain media, only needs a polarization-maintaining fiber grating, guarantees that each chamber resonance is on a polarization state.The laserresonator of each polarization state is independently, does not need Polarization Control.Because an end of fiber laser resonant cavity has adopted the grating in broadband, make it easier to quasi-resonance with the reflection peak of arrowband polarization maintaining optical fibre, reduced requirement to grating, than the easier realization of common dual laser, export more stable single-polarization, stable dual wavelength outputs in the detector, and dual wavelength difference frequency in detector produces microwave or millimeter wave, has higher cost performance.The present invention has reduced the coherence request to Active Optical Fiber, makes the inconsistent substantial influence that can not cause the single polarization dual-wavelength laser of characteristics such as Active Optical Fiber length, thereby can not influence the generation of microwave or millimeter wave.The present invention is an all optical fibre structure.The present invention also has little, compact conformation affected by environment, characteristics such as easy to implement.
Description of drawings
Fig. 1 is the device schematic diagram of single polarization dual-wavelength fiber grating laser to generate microwave, millimeter wave.
Fig. 2 is the device schematic diagram of single polarization dual-wavelength fiber grating laser to generate microwave, millimeter wave.
Embodiment
Below in conjunction with accompanying drawing 1 and Fig. 2 the present invention is further described.
Embodiment 1
The device of a kind of single polarization dual-wavelength fiber grating laser to generate microwave, millimeter wave, being connected between the device of its formation:
At splitting ratio is that 50: 50 Y divides a word end 41 of device to insert the long polarization-maintaining fiber grating 11 of a 2cm, and Y divides the output of a word end 41 of device to be connected with detector 51;
At splitting ratio is that 50: 50 Y divides a branch yoke 42 of device to insert the long Active Optical Fiber 21 of 1m, inserts a band optical fiber grating 12 at the other end of Active Optical Fiber 21;
At splitting ratio is that 50: 50 Y divides another minute yoke of device 43 to insert Active Optical Fibers 22, inserts a band optical fiber grating 13 at the other end of Active Optical Fiber 22;
Two band optical fiber grating reflection spectrums are spaced-apart, or more weak lap is arranged, the low at least 1dB of the reflectivity of the luminance factor polarization-maintaining fiber grating of its lap correspondence;
In band optical fiber grating 12 back, utilize coupler that pump light 31 is coupled in the long Active Optical Fiber 21 of 1m;
In band optical fiber grating 13 back, utilize coupler that pump light 32 is coupled in the long Active Optical Fiber 22 of 1m;
Polarization-maintaining fiber grating 11, Active Optical Fiber 21, band optical fiber grating 12 and polarization-maintaining fiber grating 11, Active Optical Fiber 22, band optical fiber grating 13 constitute two resonant cavitys, under the effect of pump light 31 or 32, produce the laser of single polarization respectively, the laser of generation is by the dual-wavelength laser of the single polarization of optical fiber end 41 outputs;
111 is a reflection peak of polarization-maintaining fiber grating among Fig. 2, and 112 is the another one reflection peak of polarization-maintaining fiber grating.121 is the reflection peak of a band optical fiber grating 12, and 131 is the reflection peak of a band optical fiber grating 13.The reflection peak 111 of polarization-maintaining fiber grating constitutes a resonant cavity with band optical fiber grating 121, Active Optical Fiber 21.The another one reflection peak 112 of polarization-maintaining fiber grating constitutes a resonant cavity with band optical fiber grating 131, Active Optical Fiber 22.This two chambeies resonance under the effect of pumping laser, the laser of two single polarization wavelength of generation.
The single polarization dual-wavelength laser of output is that 50: 50 Y divides device 41 to enter detector 51 by splitting ratio; Dual-wavelength laser produces microwave or millimeter wave at detector 51 by difference frequency.
Y divides the splitting ratio of device also to comprise other any splitting ratio.Under other splitting ratio condition, the length that can be by changing Active Optical Fiber or the method for pump power guarantee to produce microwave or the millimeter wave demand to dual-wavelength laser power.
The length of Active Optical Fiber concrete 1m not merely in an embodiment; It is fixed that the length of Active Optical Fiber is come according to doping content and pumping light power, and Active Optical Fiber guarantees under given pump power, and the condition of resonance of selecting the gain of the resonant cavity of suitable Active Optical Fiber length and suitable doping content formation to satisfy laser gets final product.Therefore the length of Active Optical Fiber is selected to be decided by pumping light power, active doping content and the loss that constitutes the chamber.
Embodiment 2
The device of a kind of single polarization dual-wavelength fiber grating laser to generate microwave, millimeter wave, being connected between the device of its formation:
At splitting ratio is that 50: 50 Y divides a word end 41 of device to insert the long polarization-maintaining fiber grating 11 of a 3cm, and Y divides the output of a word end 41 of device to be connected with detector 51;
At splitting ratio is that 50: 50 Y divides a branch yoke 42 of device to insert the long inclined to one side Active Optical Fiber 21 of guarantor of 2m, protecting inclined to one side Active Optical Fiber can or mix ytterbium or mix holmium or thorium is mixed or mixed to the ytterbium erbium altogether for er-doped, inserts a band optical fiber grating 12 at the other end of protecting inclined to one side Active Optical Fiber 21;
At splitting ratio is that 50: 50 Y divides another minute yoke 43 of device to insert to protect inclined to one side Active Optical Fiber 22, insert a band optical fiber grating 13 at the other end of protecting inclined to one side Active Optical Fiber 22;
Two band optical fiber grating reflection spectrums are spaced-apart, or more weak lap is arranged, the low at least 1dB of the reflectivity of the luminance factor polarization-maintaining fiber grating of its lap correspondence;
In band optical fiber grating 12 back, utilize coupler that pump light 31 is coupled in the long inclined to one side Active Optical Fiber 21 of guarantor of 2m;
In band optical fiber grating 13 back, utilize coupler that pump light 32 is coupled in the long inclined to one side Active Optical Fiber 22 of guarantor of 2m;
Polarization-maintaining fiber grating 11, the inclined to one side Active Optical Fiber 21 of guarantor, band optical fiber grating 12 and polarization-maintaining fiber grating 11, Active Optical Fiber 22, band optical fiber grating 13 constitute two resonant cavitys, under the effect of pump light 31 or 32, produce the laser of single polarization respectively, the laser of generation is by the dual-wavelength laser of the single polarization of optical fiber end 41 outputs;
111 is a reflection peak of polarization-maintaining fiber grating among Fig. 2, and 112 is the another one reflection peak of polarization-maintaining fiber grating.121 is the reflection peak of a band optical fiber grating 12, and 131 is the reflection peak of a band optical fiber grating 13.The reflection peak 111 of polarization-maintaining fiber grating constitutes a resonant cavity with band optical fiber grating 121, the inclined to one side Active Optical Fiber 21 of guarantor.The another one reflection peak 112 of polarization-maintaining fiber grating constitutes a resonant cavity with band optical fiber grating 131, the inclined to one side Active Optical Fiber 22 of guarantor.This two chambeies resonance under the effect of pumping laser, the laser of two single polarization wavelength of generation.
The single polarization dual-wavelength laser of output is that 50: 50 Y divides device 41 to enter detector 51 by splitting ratio; Dual-wavelength laser produces microwave or millimeter wave at detector 51 by difference frequency.
Y divides the splitting ratio of device also to comprise other any splitting ratio.Under other splitting ratio condition, the length that can be by changing Active Optical Fiber or the method for pump power guarantee to produce microwave or the millimeter wave demand to dual-wavelength laser power.
The length of Active Optical Fiber concrete 2m not merely in an embodiment; It is fixed that the length of Active Optical Fiber is come according to doping content and pumping light power, and Active Optical Fiber guarantees under given pump power, and the condition of resonance of selecting the gain of the resonant cavity of suitable Active Optical Fiber length and suitable doping content formation to satisfy laser gets final product.Therefore the length of Active Optical Fiber is selected to be decided by pumping light power, active doping content and the loss that constitutes the chamber.
Embodiment 3
The device of a kind of single polarization dual-wavelength fiber grating laser to generate microwave, millimeter wave, being connected between the device of its formation:
Divide a word end 41 of device or coupler to insert a polarization-maintaining fiber grating 11 at the Y of any splitting ratio, Y divides the output of a word end 41 of device or coupler to be connected with detector 51;
The Active Optical Fiber 21 that divides a branch yoke 42 of device or coupler to insert suitable lengths at any Y of splitting ratio inserts a band optical fiber grating 12 at the other end of Active Optical Fiber 21;
Divide device or coupler another minute yoke 43 to insert Active Optical Fibers 22 at the Y of any splitting ratio, at band optical fiber grating 13 of other end access of Active Optical Fiber 22;
Two band optical fiber grating reflection spectrums are spaced-apart, or more weak lap is arranged, the low at least 1dB of the reflectivity of the luminance factor polarization-maintaining fiber grating of its lap correspondence;
In band optical fiber grating 12 back, utilize coupler that pump light 31 is coupled in the Active Optical Fiber 21;
In band optical fiber grating 13 back, utilize coupler that pump light 32 is coupled in the Active Optical Fiber 22;
Polarization-maintaining fiber grating 11, Active Optical Fiber 21, band optical fiber grating 12 and polarization-maintaining fiber grating 11, Active Optical Fiber 22, band optical fiber grating 13 constitute two resonant cavitys, under the effect of pump light 31 or 32, produce the laser of single polarization respectively, the laser of generation is by the dual-wavelength laser of the single polarization of optical fiber end 41 outputs;
The single polarization dual-wavelength laser of output divides device or coupler 41 to enter detector 51 by the Y of any splitting ratio; Dual-wavelength laser produces microwave or millimeter wave at detector 51 by difference frequency.
The length of Active Optical Fiber is decided according to doping content and pumping light power, Active Optical Fiber guarantees under given pump power, divide under the condition of device or coupler loss at the Y that considers any splitting ratio, the condition of resonance of selecting the gain of the resonant cavity of suitable Active Optical Fiber length and suitable doping content formation to satisfy laser gets final product.Active Optical Fiber shortest length 1cm, the length of Active Optical Fiber is to the maximum: select the Y of pumping light power, active doping content and any splitting ratio to divide device or coupler etc. to constitute the loss in chambeies, under the effect of pump light, the Active Optical Fiber length in the time of just can producing laser is maximum Active Optical Fiber length.
Selected device all can be general-purpose device.Y divides device or adopts coupler.
Active Optical Fiber 21 and 22 is for er-doped or mix ytterbium or mix holmium or thorium optical fiber is mixed or mixed to the ytterbium erbium altogether.
Claims (3)
1. the device of a single polarization dual-wavelength fiber grating laser to generate microwave, millimeter wave is characterized in that:
Divide a word end (41) of device to be connected with an end of arrowband polarization-maintaining fiber grating (11) at Y, the other end of arrowband polarization-maintaining fiber grating (11) is connected with detector (51);
Divide a branch yoke (42) of device to insert second Active Optical Fiber (21) at Y, insert the second band optical fiber grating (12) at the other end of second Active Optical Fiber (21);
Divide another minute yoke (43) of device to insert first Active Optical Fiber (22) at Y, insert the first band optical fiber grating (13) at the other end of first Active Optical Fiber (22);
Two band optical fiber grating reflection spectrums are spaced-apart, or more weak lap is arranged, the low at least 1dB of the reflectivity of the luminance factor arrowband polarization-maintaining fiber grating of its lap correspondence;
At second band optical fiber grating (12) other end, utilize coupler that second pump light (31) is coupled in second Active Optical Fiber (21);
At first band optical fiber grating (13) other end, utilize coupler that first pump light (32) is coupled in first Active Optical Fiber (22);
Arrowband polarization-maintaining fiber grating (11), second Active Optical Fiber (21), the second band optical fiber grating (12) constitute a resonant cavity, arrowband polarization-maintaining fiber grating (11), first Active Optical Fiber (22), the first band optical fiber grating (13) constitute another resonant cavity, under the effect of second pump light (31) or first pump light (32), produce the laser of single polarization respectively, the laser of the single polarization that produces enters detector (51) by arrowband polarization-maintaining fiber grating (11), produces microwave or millimeter wave at detector (51) difference frequency.
2. the device of a kind of single polarization dual-wavelength fiber grating laser to generate microwave according to claim 1, millimeter wave is characterized in that: second Active Optical Fiber (21) and first Active Optical Fiber (22) comprise protects inclined to one side Active Optical Fiber.
3. the device of a kind of single polarization dual-wavelength fiber grating laser to generate microwave according to claim 1, millimeter wave is characterized in that: second Active Optical Fiber (21) and first Active Optical Fiber (22) are for er-doped or mix ytterbium or mix holmium or the ytterbium erbium is mixed or mixed thorium altogether or mixes praseodymium or neodymium-doped fiber.
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| CN101714739B (en) * | 2009-11-20 | 2011-05-11 | 北京交通大学 | Y type cavity all-optical fiber hopping frequency millimeter wave generating device |
| KR101845514B1 (en) * | 2010-12-17 | 2018-04-04 | 삼성전자주식회사 | Optical modulator with reduced size and optical transmitter having the same |
| CN102790349A (en) * | 2012-07-30 | 2012-11-21 | 北京航空航天大学 | Multi-wavelength passively Q-switched laser |
| CN105425340B (en) * | 2015-12-21 | 2018-08-31 | 华中科技大学 | A kind of optical interleaver |
| CN106325049A (en) * | 2016-11-08 | 2017-01-11 | 中北大学 | End-coupling nano optical waveguide type dual-optical-path chip-scale atomic clock |
| CN106406074A (en) * | 2016-11-08 | 2017-02-15 | 中北大学 | Perpendicular coupling nanometer optical waveguide dual-optical-path chip atomic clock |
| CN106405449A (en) * | 2016-12-05 | 2017-02-15 | 中北大学 | Vertical-coupling nanometer optical waveguide dual-optical-path chip-level magnetometer |
| CN106405450A (en) * | 2016-12-05 | 2017-02-15 | 中北大学 | End-coupling nanometer optical waveguide dual-optical-path chip-level magnetometer |
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