CN100524977C - Transmission device generating micro-wave and mm wave by using linear cavity dual-wave optical fiber laser - Google Patents
Transmission device generating micro-wave and mm wave by using linear cavity dual-wave optical fiber laser Download PDFInfo
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- CN100524977C CN100524977C CNB2007101769995A CN200710176999A CN100524977C CN 100524977 C CN100524977 C CN 100524977C CN B2007101769995 A CNB2007101769995 A CN B2007101769995A CN 200710176999 A CN200710176999 A CN 200710176999A CN 100524977 C CN100524977 C CN 100524977C
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Abstract
The invention discloses a device for generating a microwave and a millimeter wave by utilizing linear cavity double wavelength fiber laser. In the invention, active optical fiber (21), (22) is selected, a deviation preserving fiber grating (11) is coupled in the middle part, and broadband fiber gratings (12), (13) are coupled in the other two sides. The reflection spectrums of the broadband fiber gratings are isolated mutually or are provided with a weaker overlapping part. The invention utilizes a coupler to cause pumping light (31), (32) to be coupled into the active optical fiber. The reflection peaks of the two broadband fiber gratings are respectively aligned to the reflection peak of the deviation preserving fiber grating, and each broadband fiber grating forms a resonator only with a the reflection peak in the polarization state of the deviation preserving fiber grating to generate double wavelength laser with ingle polarization. The double wavelength laser is inputted into photodetectors (51), (52) and the microwave or the millimeter wave with two paths is generated in the photodetectors in the mode of difference frequency.
Description
Technical field:
The present invention relates to utilize line style chamber dual-wavelength fiber grating laser to realize device and its implementation of two-way microwave, millimeter wave.Be applicable 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.
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 is except having 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, realizes 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 the device that utilizes line style chamber dual-wavelength optical-fiber microwave from Laser, millimeter wave.
The realization of the object of the invention is by the following technical programs;
Utilize the device of line style chamber dual-wavelength optical-fiber microwave from Laser, millimeter wave, constitute the connection between the device of this device:
Two Active Optical Fibers connect by polarization-maintaining fiber grating;
Respectively insert a band optical fiber grating at the other two ends of two Active Optical Fibers;
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 lap correspondence;
In the back of two band optical fiber gratings, utilize coupler that first pump light and second pump light are coupled in the Active Optical Fiber respectively;
Two reflection peaks of polarization-maintaining fiber grating respectively with two band optical fiber gratings (form different wavelength of laser resonant cavity), produce laser, in the first line style chamber or/and end, second line style chamber output single polarization dual-wavelength laser;
The single polarization dual-wavelength laser of output enters first photodetector by the output in the first line style chamber; The single polarization dual-wavelength laser of output enters second photodetector by the output in the second line style chamber, dual-wavelength laser or/and the second photodetector difference frequency produces microwave or millimeter wave, obtains single channel or two-way microwave or millimeter wave at first photodetector.
Two Active Optical Fibers are selected er-doped for use or are mixed ytterbium or mix holmium or the ytterbium erbium is mixed or mixed thorium altogether or mixes praseodymium or neodymium-doped fiber.
Two Active Optical Fibers or be polarization maintaining optical fibre.
Beneficial effect of the present invention is specific as follows:
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 photodetector, and dual wavelength difference frequency in photodetector 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 that utilizes line style chamber dual-wavelength optical-fiber microwave from Laser, millimeter wave.
Fig. 2 utilizes the grating schematic diagram that uses in the device of line style chamber dual-wavelength optical-fiber microwave from Laser, millimeter wave.
Embodiment
Purpose of the present invention just provides the device that utilizes line style chamber dual-wavelength optical-fiber microwave from Laser, millimeter wave, overcomes the deficiency that existing electric territory or light territory produce microwave or millimeter wave.
Below in conjunction with attached Fig. 1 and 2 the present invention is further described.
Embodiment 1:
Utilize the device of line style chamber dual-wavelength optical-fiber microwave from Laser, millimeter wave, constitute the connection between the device of this device:
1. select the er-doped Active Optical Fiber 21 and 22 of suitable length, er-doped Active Optical Fiber 21 and 22 usefulness polarization-maintaining fiber gratings 11 are coupled together.
2. distinguish access band fiber grating 12 and band optical fiber grating 13 at the other two ends of er-doped Active Optical Fiber 21 and er-doped Active Optical Fiber 22, the reflectance spectrum of band optical fiber grating 12 and band optical fiber grating 13 is spaced-apart, there is not lap, or more weak lap is arranged, promptly the reflectivity of the luminance factor polarization-maintaining fiber grating of lap correspondence hangs down 1dB at least.
3. in the back of band optical fiber grating 12 and band optical fiber grating 13, utilize coupler that first pump light 31 and second pump light 32 are coupled in the er-doped Active Optical Fiber respectively.
4. two of polarization-maintaining fiber grating 11 reflection peaks form the different wavelength of laser resonant cavitys with band optical fiber grating 12 and band optical fiber grating 13 respectively, produce laser, in the first line style chamber 41 or 42 ends, second line style chamber output single polarization dual-wavelength laser.
111 is a reflection peak of polarization-maintaining fiber grating 11 among Fig. 2,112 is the another one reflection peak of polarization-maintaining fiber grating 11, and 121 is the reflection peak of a band optical fiber grating 12, distinguishes with dotted line, 131 is the reflection peak of a band optical fiber grating 13, distinguishes with dotted line.The reflection peak 111 of polarization-maintaining fiber grating constitutes a resonant cavity with band optical fiber grating 121, er-doped 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, er-doped Active Optical Fiber 22, this two chambeies resonance under the effect of pumping laser, the laser of two single polarization wavelength of generation.The power of the dual wavelength list polarization laser that produces does not require identical, and its difference can be for being worth arbitrarily.
5. Shu Chu single polarization dual-wavelength laser enters first photodetector 51 by the output in the first line style chamber 41; The single polarization dual-wavelength laser of output enters second photodetector 52 by the output in the second line style chamber 42, dual-wavelength laser produces microwave or millimeter wave at first photodetector 51 and second photodetector, 52 difference frequencies, obtains two-way microwave or millimeter wave.
The length of er-doped Active Optical Fiber is decided according to doping content and pumping light power, the er-doped 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.Er-doped Active Optical Fiber shortest length 1cm, the length of er-doped Active Optical Fiber is to the maximum: select pumping light power, have source doping absorption coefficient, Active Optical Fiber and tie point etc. to constitute the loss in chamber, under the effect of given pump light, the er-doped Active Optical Fiber length in the time of just can producing laser.
Embodiment 2:
Utilize the device of line style chamber dual-wavelength optical-fiber microwave from Laser, millimeter wave, constitute the connection between the device of this device:
1. select the ytterbium of mixing of suitable length to protect inclined to one side Active Optical Fiber 21 and the inclined to one side Active Optical Fiber of 22 employing guarantors, ytterbium is protected inclined to one side Active Optical Fiber 21 and 22 usefulness polarization-maintaining fiber gratings 11 couple together mixing.
2. mixing other two ends difference access band fiber grating 12 and the band optical fiber grating 13 that ytterbium is protected inclined to one side Active Optical Fiber 21 and protected inclined to one side Active Optical Fiber 22, the reflectance spectrum of band optical fiber grating 12 and band optical fiber grating 13 is spaced-apart, or more weak lap is arranged, promptly the reflectivity of the luminance factor polarization-maintaining fiber grating of lap correspondence hangs down 1dB at least.
3. in the back of band optical fiber grating 12 and band optical fiber grating 13, utilize coupler that first pump light 31 and second pump light 32 are coupled in the inclined to one side Active Optical Fiber of guarantor respectively.
4. two of polarization-maintaining fiber grating 11 reflection peaks form the different wavelength of laser resonant cavity with band optical fiber grating 12 and band optical fiber grating 13 respectively, produce laser, at the first line style chamber 41 and the second line style chamber, 42 end outputting dual wavelength lasers.
111 is a reflection peak of polarization-maintaining fiber grating 11 among Fig. 2,112 is the another one reflection peak of polarization-maintaining fiber grating 11, and 121 is the reflection peak of a band optical fiber grating 12, distinguishes with dotted line, 131 is the reflection peak of a band optical fiber grating 13, distinguishes with dotted line.The reflection peak 111 of polarization-maintaining fiber grating and band optical fiber grating 121, mix ytterbium and protect inclined to one side Active Optical Fiber 21 and constitute a resonant cavity, the another one reflection peak 112 of polarization-maintaining fiber grating and band optical fiber grating 131, mix ytterbium and protect inclined to one side Active Optical Fiber 22 and constitute a resonant cavity, this two chambeies resonance under the effect of pumping laser, the laser of two single polarization wavelength of generation.The power of the dual wavelength list polarization laser that produces does not require identical, and its difference can be for being worth arbitrarily.
5. Shu Chu single polarization dual-wavelength laser enters and first photodetector 51 by the output in the first line style chamber 41; Or the single polarization dual-wavelength laser of output enters second photodetector 52 by the output with the second line style chamber 42, dual-wavelength laser produces microwave or millimeter wave at first photodetector 51 or second photodetector, 52 difference frequencies, obtains single channel microwave or millimeter wave.
Mix length that ytterbium protects inclined to one side Active Optical Fiber come according to doping content and pumping light power fixed, mix ytterbium and protect inclined to one side Active Optical Fiber and guarantee under given pump power, select the suitable ytterbium of mixing to protect the gain of the resonant cavity that inclined to one side Active Optical Fiber length and suitable doping content constitute and satisfy that the condition of resonance of laser gets final product.Mix ytterbium and protect inclined to one side Active Optical Fiber shortest length 1cm, mixing ytterbium protects the length of inclined to one side Active Optical Fiber and is to the maximum: select pumping light power, have source doping absorption coefficient, Active Optical Fiber and tie point etc. to constitute the loss in chambeies, under the effect of given pump light, mix ytterbium Active Optical Fiber length in the time of just laser can being produced.
Active Optical Fiber is selected er-doped for use or is mixed ytterbium or mix holmium or the ytterbium erbium is mixed or mixed thorium altogether or mixes praseodymium or neodymium-doped fiber.
Used device and material are commercialization device and material.
Claims (3)
1. utilize the device of line style chamber dual-wavelength optical-fiber microwave from Laser, millimeter wave, it is characterized in that, constitute the connection between the device of this device:
First Active Optical Fiber (21) is connected with arrowband polarization-maintaining fiber grating (11) with second Active Optical Fiber (22);
Insert the first band optical fiber grating (12) and the second band optical fiber grating (13) respectively at the other two ends of first Active Optical Fiber (21) and second Active Optical Fiber (22);
The reflectance spectrum of the first band optical fiber grating (12) and the second band optical fiber grating (13) is spaced-apart;
At the other end of first band optical fiber grating (12) other end and the second band optical fiber grating (13), utilize coupler first pump light (31) or/and second pump light (32) be coupled in the Active Optical Fiber;
The reflection peak of arrowband polarization-maintaining fiber grating (11) and the first band optical fiber grating (12) form another reflection peak and the second band optical fiber grating (13) formation, the second line style chamber (42) of the first line style chamber (41) and arrowband polarization-maintaining fiber grating (11), produce laser respectively in the first line style chamber (41) and the second line style chamber (42), in the first line style chamber (41) or end, the second line style chamber (42) output single polarization dual-wavelength laser;
The single polarization dual-wavelength laser of output enters first photodetector (51) by the output in the first line style chamber (41); The single polarization dual-wavelength laser of output enters second photodetector (52) by the output in the second line style chamber (42), dual-wavelength laser or/and second photodetector (52) difference frequency produces microwave or millimeter wave, obtains single channel or two-way microwave or millimeter wave at first photodetector (51).
2. the device that utilizes line style chamber dual-wavelength optical-fiber microwave from Laser, millimeter wave according to claim 1 is characterized in that: first Active Optical Fiber (21) and second Active Optical Fiber (22) are selected er-doped for use or are mixed ytterbium or mix holmium or the ytterbium erbium is mixed or mixed thorium altogether or mixes praseodymium or neodymium-doped fiber.
3. the device that utilizes line style chamber dual-wavelength optical-fiber microwave from Laser, millimeter wave according to claim 1 is characterized in that: first Active Optical Fiber (21) and second Active Optical Fiber (22) are polarization maintaining optical fibre.
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| CNB2007101769995A CN100524977C (en) | 2007-11-08 | 2007-11-08 | Transmission device generating micro-wave and mm wave by using linear cavity dual-wave optical fiber laser |
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| CNB2007101769995A CN100524977C (en) | 2007-11-08 | 2007-11-08 | Transmission device generating micro-wave and mm wave by using linear cavity dual-wave optical fiber laser |
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| CN100524977C true CN100524977C (en) | 2009-08-05 |
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| CN101615761B (en) * | 2008-06-24 | 2011-02-16 | 中国科学院西安光学精密机械研究所 | Coherent beam combination all-fiber laser |
| 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 |
| CN106356700B (en) * | 2016-11-15 | 2019-01-04 | 湖南工学院 | A kind of method and apparatus generating high stability microwave and millimeter wave source |
| CN110261688A (en) * | 2019-06-27 | 2019-09-20 | 中国电力科学研究院有限公司 | A kind of method and system of the wireless measurement of distortion electric field |
| CN114447744A (en) * | 2022-01-28 | 2022-05-06 | 江苏师范大学 | Laser and method for generating electromagnetic wave signal with high phase coherence |
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| a stable dual-wavelength fiber laser with tunablewavelengthspacing using a polarization-maintaining linearcavity. D. Liu at al.applied physics B,Vol.81 . 2005 |
| a stable dual-wavelength fiber laser with tunablewavelengthspacing using a polarization-maintaining linearcavity. D. Liu at al.applied physics B,Vol.81. 2005 * |
| an optical millimeter wave fiber laser. Y. Lai at al.optical fiber communications conference, 2003. OFC 2003,Vol.1 . 2004 |
| an optical millimeter wave fiber laser. Y. Lai at al.optical fiber communications conference, 2003. OFC 2003,Vol.1. 2004 * |
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| ROF***中毫米波产生方法的研究. 裴军等.有线电视技术，第9卷. 2007 |
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