CN101321018B - Microwave/millimeter wave generator based on array wave-guide optical grating and optical fiber optical grating - Google Patents
Microwave/millimeter wave generator based on array wave-guide optical grating and optical fiber optical grating Download PDFInfo
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- CN101321018B CN101321018B CN200810116662XA CN200810116662A CN101321018B CN 101321018 B CN101321018 B CN 101321018B CN 200810116662X A CN200810116662X A CN 200810116662XA CN 200810116662 A CN200810116662 A CN 200810116662A CN 101321018 B CN101321018 B CN 101321018B
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Abstract
A microwave/millimeter wave generator based on the array wave-guide grate and an optical fiber grate is disclosed. On one end of an array waveguide grate (60), a pumping light (40) is coupled with a doped active optical fiber through a wavelength division multiplexer (30). The pumping light (411, 412, 421, 422...4N1,4N2) on the branch end is coupled with an doped active optical fiber (211, 212, 221, 222...2N1,2N2) through wavelength division multiplexers (311,312,321,322...3N1,3N2), and the wavelength division multiplexer grates (111, 112, 121,122,1N1, 1N2) on the branch end of the array waveguide grate (60) are composed of an independent resonant cavity with one end of an optical fiber grate (10) of the array waveguide grate (60), to generate the laser. Each laser is coupled to anyone of the high speed photo detectors (91-9N), generating the microwave/millimeter wave signal through the difference frequency.
Description
Technical field
The present invention relates to a kind of full light microwave/millimeter wave generator, be applicable to optical fiber microwave communication (RoF:Radioon/over Fiber), microwave photon, Fibre Optical Sensor, fiber laser, optical fiber communication, satellite communication and radar etc.
Background technology
Wireless penetration and broadband be the focus of current communication industry and even whole information industry, radio communication makes at any time, Anywhere with anyone between communicate by letter and become possibility.And broadband connections can be sent to the user apace with business such as voice, data, video and multimedias.Microwave photon is learned a uncharted field that microwave is combined with photonic propulsion that arises at the historic moment just under this demand, the advantage of microwave that it is integrated with photonic propulsion, between rf wave and optical fiber, realize transparent translation, 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, realizes the logical transmission of band of rf wave in optical fiber, undamped, the phase mutual interference of no interchannel.And microwave photon learn in one of key basic fundamental be exactly the generation of microwave and millimeter wave, in recent years, along with people to the ever-increasing demand of broadband connections capacity, the microwave and millimeter wave generator becomes one of focus of numerous scholar's research gradually.Handle based on the microwave signal of electronic equipment compared with tradition, the microwave photon signal processing has 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.
It is the key technology that a microwave photon is learned that optical means produces microwave/millimeter wave.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, millimeter-wave 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, millimeter-wave signal, frequency from several GHz to 100GHz; There is the Bragg grating of employing to replace the Mach-Zehnder interferometer, produces microwave, millimeter wave as filter; Also have based on the chromatic dispersion of non-Chirped Gaussian Pulses in transmission course and the microwave/millimeter wave of nonlinear effect generation complex frequency.These production methods, complex structure, poor stability, the efficient of generation is not high.
Opened a field mystery, full of hope in the development that is integrated in telecommunication of photon technology and microwave/millimeter wave.Last decade, microwave photon are learned and to have been caused the attention of countries in the world, now special microwave photon international conference every year in the North America, Europe, the Asian-Pacific area holds in turn, the scheme of seeking more optimal microwave/millimeter wave generator has profound significance.
Summary of the invention
Purpose of the present invention overcomes deficiencies such as existing microwave/millimeter wave generator bandwidth constraints exactly, and a kind of microwave/millimeter wave generator based on array waveguide grating and fiber grating is provided, and it can realize stable practical microwave/millimeter wave output.
Technical scheme of the present invention:
A kind of microwave/millimeter wave generator based on array waveguide grating and fiber grating comprises: fiber grating, doping Active Optical Fiber, wavelength division multiplexer, pump light, array waveguide grating, optical isolator, high-speed photodetector; Connection between them:
Word end at array waveguide grating connects doping Active Optical Fiber, sampling optical-fiber grating or cascade fiber grating or band optical fiber grating, wavelength division multiplexer and optical isolator successively;
Each road in the array waveguide grating divergent ends connects doping Active Optical Fiber, fiber grating, wavelength division multiplexer successively, and every two-way is connected with any one high-speed photodetector;
Word end at array waveguide grating, pump light is coupled in the doping Active Optical Fiber by wavelength division multiplexer, in each road of divergent ends, pump light is coupled into the doping Active Optical Fiber by wavelength division multiplexer respectively, the fiber grating on each road of array waveguide grating divergent ends constitutes independently resonant cavity with the fiber grating of array waveguide grating one word end respectively, produce laser, wherein two-way laser is coupled in any one high-speed photodetector simultaneously arbitrarily, produces the microwave/millimeter wave signal by difference frequency.
The present invention proposes a kind of microwave/millimeter wave generator based on array waveguide grating and fiber grating, and each road of the divergent ends of array waveguide grating connects doping Active Optical Fiber, fiber grating, wavelength division multiplexer, fiber coupler and high-speed photodetector successively; Word end at array waveguide grating, pump light is coupled in the doping Active Optical Fiber by wavelength division multiplexer, in each road of divergent ends, pump light is coupled in the doping Active Optical Fiber by wavelength division multiplexer respectively, the fiber grating of array waveguide grating divergent ends constitutes independently resonant cavity with the fiber grating of array waveguide grating one word end respectively, produce laser, each road laser at first enters and carries out beam split in the fiber coupler, select two couplers afterwards arbitrarily, and with its output light enters in the high-speed photodetector after making up in twos simultaneously any one carries out difference frequency, thereby produce the microwave/millimeter wave signal.
Beneficial effect of the present invention is specific as follows:
The advantage of concentrating rf wave and lightwave technology based on the microwave/millimeter wave generator of array waveguide grating and fiber grating of the present invention, make full use of the wavelength selectivity of fiber grating, the generation multiwavelength laser directly is coupled or is coupled in the high-speed photodetector by being concerned with after the fiber coupler beam split again, realize the output of microwave/millimeter wave through difference frequency, the microwave/millimeter wave that this generator produces is not only realized simple and easy, and has higher cost performance.The present invention is an all optical fibre structure, good with optical fiber microwave system compatibility, compact conformation, can produce the microwave signal of several GHz to hundreds of GHz, realize miniaturization and integrability easily, and affected by environment little, cost is low, easy to implement, have broad application prospects in fields such as communication, signal processing, radars.
Description of drawings
Fig. 1 is the structural representation of any positive integer for microwave/millimeter wave generator embodiment one N based on array waveguide grating and fiber grating.
Fig. 2 has fiber coupler for the microwave/millimeter wave generator embodiment two based on array waveguide grating and fiber grating and N is the structural representation of any positive integer.
Fig. 3 gets 16 structural representation for microwave/millimeter wave generator embodiment three N based on array waveguide grating and fiber grating.
Fig. 4 gets 32 structural representation for microwave/millimeter wave generator embodiment four N based on array waveguide grating and fiber grating.
Fig. 5 has coupler for the microwave/millimeter wave generator embodiment five based on array waveguide grating and fiber grating and N gets 2 structural representation.
Fig. 6 has coupler for the microwave/millimeter wave generator embodiment six based on array waveguide grating and fiber grating and N gets 1000 structural representation.
Embodiment
Below in conjunction with accompanying drawing the microwave/millimeter wave generator based on array waveguide grating and fiber grating is further described.
Embodiment one
As Fig. 1, based on the microwave/millimeter wave generator of array waveguide grating and fiber grating, the connection between the device of its formation:
Select array waveguide grating 60,2N branch road of its divergent ends.
Select the doping Active Optical Fiber 20 and the doping Active Optical Fiber 211 of suitable length, 212,221,222......2N1,2N2, all doping Active Optical Fibers are er-doped, mix ytterbium, mix holmium, thorium is mixed, mixed to the ytterbium erbium altogether, mix praseodymium or neodymium-doped fiber, the length when its length satisfies the condition of resonance of laser for the gain that constitutes resonant cavity under given pump power.
Word end at array waveguide grating 60 connects doping Active Optical Fiber 20, fiber grating 10, wavelength division multiplexer 30, optical isolator 70 successively.
Divergent ends at array waveguide grating 60 connects doping Active Optical Fiber 211,212,221 successively, 222......2N1,2N2, fiber grating 111,112,121,122......1N1,1N2, wavelength division multiplexer 311,312,321,322......3N1 3N2, every two-way connect any one among high-speed photodetector 91～9N.
Word end at array waveguide grating 60, pump light 40 is coupled in the doping Active Optical Fiber 20 by wavelength division multiplexer 30, in divergent ends, and pump light 411,412,421,422......4N1,4N2 are respectively by wavelength division multiplexer 311,312,321,322......3N1,3N2 are coupled into doping Active Optical Fiber 211,212,221,222......2N1 is among the 2N2, the fiber grating 111 of array waveguide grating 60 divergent ends, 112,121,122......1N1,1N2 constitutes independently resonant cavity with the fiber grating 10 of array waveguide grating 60 1 word ends respectively, produce laser, wherein any two-way laser is coupled into any one among high-speed photodetector 91～9N simultaneously, produces N road microwave/millimeter wave signal by difference frequency.
Embodiment two
As Fig. 2, based on the microwave/millimeter wave generator of array waveguide grating and fiber grating, the connection between the device of its formation:
Select an array waveguide grating 60, divergent ends N road.
Select the doping Active Optical Fiber 20 and the doping Active Optical Fiber 21～2N of suitable length, the doping Active Optical Fiber is er-doped, mix ytterbium, mix holmium, thorium is mixed, mixed to the ytterbium erbium altogether, mix praseodymium or neodymium-doped fiber, the length when its length satisfies the condition of resonance of laser for the gain that constitutes resonant cavity under given pump power.
Word end at array waveguide grating 60 connects doping Active Optical Fiber 20, fiber grating 10, wavelength division multiplexer 30, optical isolator 70 successively.
Divergent ends at array waveguide grating 60 connects doping Active Optical Fiber 21～2N, fiber grating 11～1N, wavelength division multiplexer 31～3N, fiber coupler 81～8N, high-speed photodetector 91～9N respectively.
Embodiment three
As Fig. 3, based on the microwave/millimeter wave generator of array waveguide grating and fiber grating, the connection between the device of its formation:
Select array waveguide grating 60, N=16.
Select the doping Active Optical Fiber 20 of 0.5m and the doping Active Optical Fiber 211,212,221 of 1.0m, 222......2161,2162, all doping Active Optical Fibers are Er-doped fiber.
Word end at array waveguide grating 60 connects doping Active Optical Fiber 20, fiber grating 10, wavelength division multiplexer 30, optical isolator 70 successively.
Divergent ends at array waveguide grating 60 connects doping Active Optical Fiber 211,212,221 successively, 222......2161,2162, fiber grating 111,112, and 121,122......1161,1162, wavelength division multiplexer 311,312, and 321,322......3161,3162, every two-way connects in the high-speed photodetector 91～916 any one.
Word end at array waveguide grating 60, pump light 40 is coupled in the doping Active Optical Fiber 20 by wavelength division multiplexer 30, in divergent ends, pump light 411,412,421,422......4161,4162 respectively by wavelength division multiplexer 311,312,321,322......3161,3162 are coupled into doping Active Optical Fiber 211,212,221,222......2161 is in 2162, the fiber grating 111 of array waveguide grating 60 divergent ends, 112,121,122......1161,1162 constitute independently resonant cavity with the fiber grating 10 of array waveguide grating 60 1 word ends respectively, produce laser, first and second branch roads output light is coupled into high-speed photodetector 91 simultaneously, third and fourth branch road output light is coupled into high-speed photodetector 92...... the 31 simultaneously and the 30 two tunnel output light is coupled into high-speed photodetector 916 simultaneously, produces 16 road microwave/millimeter wave signals by difference frequency.
Embodiment four
As Fig. 4, based on the microwave/millimeter wave generator of array waveguide grating and fiber grating, the connection between the device of its formation:
Select an array waveguide grating 60, N=32.
Select the doping Active Optical Fiber 20 of 0.5m and the doping Active Optical Fiber 211,212,221 of 1.5m, 222......2321,2322, all doped fibers are Yb dosed optical fiber.
Word end at array waveguide grating 60 connects doping Active Optical Fiber 20, fiber grating 10, wavelength division multiplexer 30, optical isolator 70.
Each road of divergent ends at array waveguide grating 60 connects doping Active Optical Fiber 211,212,221 successively, 222......2321,2322, fiber grating 111,112, and 121,122......1321,1322, wavelength division multiplexer 311,312, and 321,322......3321,3322, every two-way connects in the high-speed photodetector 91～932 any one.
Word end at array waveguide grating 60, pump light 40 is coupled in the doping Active Optical Fiber 20 by wavelength division multiplexer 30, in divergent ends, pump light 411,412,421,422......4321,4322 respectively by wavelength division multiplexer 311,312,321,322......3321,3322 are coupled into doping Active Optical Fiber 211,212,221,222......2321 is in 2322, the fiber grating 111 of array waveguide grating 60 divergent ends, 112,121,122......1321,1322 constitute independently resonant cavity with the fiber grating 10 of array waveguide grating 60 1 word ends respectively, produce laser, the output light of the first and the 3rd branch road is coupled into high-speed photodetector 91 simultaneously, the output light of the second and the 4th branch road is coupled into high-speed photodetector 92..... the 63 and the 64 simultaneously and is coupled into high-speed photodetector 932 simultaneously, produces 32 road microwave/millimeter wave signals by difference frequency.
Embodiment five
As Fig. 5, based on the microwave/millimeter wave generator of array waveguide grating and fiber grating, the connection between the device of its formation:
Select an array waveguide grating 60, N=2.
Select the doping Active Optical Fiber 20 of 15m and the doping Active Optical Fiber 21,22 of 1.5m, doping Active Optical Fiber 20 is for mixing holmium optical fiber, and all the other doped fibers are Yb dosed optical fiber.
Word end at array waveguide grating 60 connects doping Active Optical Fiber 20, fiber grating 10, wavelength division multiplexer 30, optical isolator 70 successively.
Divergent ends at array waveguide grating 60 connects doping Active Optical Fiber 21～22, fiber grating 11～12, wavelength division multiplexer 31～32, fiber coupler 81～82, high-speed photodetector 91～92 respectively.
Pump light 40 is coupled in the doping Active Optical Fiber 20 by wavelength division multiplexer 30, the fiber grating 11～12 of divergent ends constitutes 2 independently resonant cavitys with the fiber grating 10 of a word end respectively, produce laser, each road laser at first enters in the fiber coupler 81,82 and carries out beam split, fiber coupler is exported light to be made up in twos, enter simultaneously in the high- speed photodetector 91,92 and carry out difference frequency, produce 2 road microwave/millimeter wave signals.
Embodiment six
As Fig. 6, based on the microwave/millimeter wave generator of array waveguide grating and fiber grating, the connection between the device of its formation:
Select an array waveguide grating 60, N=1000.
Select the doping Active Optical Fiber 20 of 30m and the doping Active Optical Fiber 21～21000 of 3m, doping Active Optical Fiber 20 is for mixing holmium optical fiber, and all the other doped fibers are thulium doped fiber.
Fiber grating 10 is the band optical fiber grating.Fiber grating 11～11000 is a polarization-maintaining fiber grating.
Word end at array waveguide grating 60 connects doping Active Optical Fiber 20, fiber grating 10, wavelength division multiplexer 30, optical isolator 70 successively.
Divergent ends at array waveguide grating 60 connects doping Active Optical Fiber 21～21000, fiber grating 11～11000, wavelength division multiplexer 31～31000, fiber coupler 81～81000, high-speed photodetector 91～91000 respectively.
Pump light 40 is coupled in the doping Active Optical Fiber 20 by wavelength division multiplexer 30, the fiber grating 11～11000 of divergent ends constitutes 1000 independently resonant cavitys with the fiber grating 10 of a word end respectively, produce laser, each road laser at first enters and carries out beam split in the fiber coupler 81～81000, after selecting the output light of fiber coupler 81 and 83 to make up in twos, enter simultaneously in high- speed photodetector 91 and 93, after selecting the output light of fiber coupler 82 and 84 to make up in twos, enter simultaneously in high-speed photodetector 92 and 94 ... after selecting the output light of fiber coupler 8999 and 81000 to make up in twos, enter simultaneously in high-speed photodetector 9999 and 91000, carry out difference frequency, each produces two-way microwave/millimeter wave signal.
The present invention propose a kind of effectively, reliably based on the microwave/millimeter wave generator of array waveguide grating and fiber grating, the length when the active fiber lengths of used doping satisfies the condition of resonance of laser for the gain that constitutes resonant cavity under given pump power; Involved optical device is commercially available device commonly used in this generator; The N that relates in the generator is determined that by the condition of present array waveguide grating along with the development of array waveguide grating, the microwave/millimeter wave number of arrays that this generator can produce will increase gradually.
Claims (3)
1. based on the microwave/millimeter wave generator of array waveguide grating and fiber grating, it is characterized in that, this generator comprises: fiber grating (10), first one by one fiber grating (111) to a N one fiber grating (1N1), the one one two fiber grating (112) is to a N two fiber gratings (1N2), doping Active Optical Fiber (20), second mixes Active Optical Fiber (211) one by one to the 2nd N one doping Active Optical Fiber (2N1), the 212 doping Active Optical Fiber (212) is to the 2nd N two doping Active Optical Fibers (2N2), wavelength division multiplexer (30), the 3rd one by one wavelength division multiplexer (311) to the 3rd N one wavelength division multiplexer (3N1), the 312 wavelength division multiplexer (312) is to the 3rd N two wavelength division multiplexers (3N2), pump light (40), the 4th one by one pump light (411) to the 4th N one pump light (4N1), the 412 pump light (412) is to the 4th N two pump lights (4N2), array waveguide grating (60), optical isolator (70), first high-speed photodetector (91) is to N high-speed photodetector (9N), wherein N is any positive integer, the connection between them:
Word end at array waveguide grating (60) connects doping Active Optical Fiber (20), fiber grating (10), wavelength division multiplexer (30), optical isolator (70) successively;
Connect second end of Active Optical Fiber (211) that mix one by one respectively in the divergent ends of array waveguide grating (60) to an end of the 2nd N one doping Active Optical Fiber (2N1) and the 212 doping Active Optical Fiber (212) to the 2nd N two doping Active Optical Fibers (2N2), second mix one by one Active Optical Fiber (211) to the other end of the 2nd N one doping Active Optical Fiber (2N1) connect respectively first one by one fiber grating (111) to an end of a N one fiber grating (1N1), the 212 doping Active Optical Fiber (212) to the other end of the 2nd N two doping Active Optical Fibers (2N2) connects the end of the one two one fiber grating (121) to a N two fiber gratings (1N2) respectively, first one by one fiber grating (111) to the other end of a N one fiber grating (1N1) connect respectively the 3rd one by one wavelength division multiplexer (311) to the 3rd N one wavelength division multiplexer (3N1), the one two one fiber grating (121) connects the 312 wavelength division multiplexer (312) respectively to the 3rd N two wavelength division multiplexers (3N2) to the other end of a N two fiber gratings (1N2), and every two-way is connected to first high-speed photodetector (91) any one to the N high-speed photodetector (9N);
Word end at array waveguide grating (60), pump light (40) is coupled in the doping Active Optical Fiber (20) by wavelength division multiplexer (30), in divergent ends, the 4th one by one pump light (411) to the 4th N one pump light (4N1) respectively by the 3rd one by one wavelength division multiplexer (311) to the 3rd N one wavelength division multiplexer (3N1) be coupled into second and mix Active Optical Fiber (211) one by one to the 2nd N one doping Active Optical Fiber (2N1), the 412 pump light (412) to the 4th N two pump lights (4N2) are coupled into the 212 doping Active Optical Fiber (212) to the 2nd N two doping Active Optical Fibers (2N2) by the 312 wavelength division multiplexer (312) to the 3rd N two wavelength division multiplexers (3N2) respectively, array waveguide grating (60) divergent ends first one by one fiber grating (111) constitute independently resonant cavity with the fiber grating (10) of array waveguide grating (60) one word ends respectively to a N one fiber grating (1N1) and the one one two fiber grating (112) to a N two fiber gratings (1N2), produce laser, wherein arbitrarily two-way laser is coupled into first high-speed photodetector (91) any one to the N high-speed photodetector (9N) simultaneously, produces the microwave/millimeter wave signal by difference frequency.
2. the microwave/millimeter wave generator based on array waveguide grating and fiber grating according to claim 1 is characterized in that, the doping Active Optical Fiber is er-doped, mix ytterbium, mix holmium, thorium is mixed, mixed to the ytterbium erbium altogether, mix praseodymium or neodymium-doped Active Optical Fiber.
3. the microwave/millimeter wave generator based on array waveguide grating and fiber grating according to claim 1, it is characterized in that, by fiber grating, pump light, wavelength division multiplexer, after Active Optical Fiber produces laser, enter the 81 to the 8th N fiber coupler and (carry out beam split in 81～8N), the mode that the output light of two couplers of any selection makes up in twos is arbitrarily, promptly enter first to the N high-speed photodetector (any one in 91～9N) carried out the coherent light of difference frequency and selected compound mode to have two kinds, select wherein a kind of compound mode arbitrarily, enter first to the N high-speed photodetector (any one in 91～9N) carried out difference frequency, thereby produces the microwave/millimeter wave signal.
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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 |
| CN101794952B (en) * | 2010-01-27 | 2011-06-22 | 中国科学院半导体研究所 | Accurately-tunable optical fiber laser microwave source with low phase noise and narrow line width |
| CN101877614A (en) * | 2010-06-24 | 2010-11-03 | 北京邮电大学 | Millimeter wave WDM-ROF (Wavelength Division Multiplexing-Radio Over Fiber) system and method based on supercontinuum |
| CN103837749A (en) * | 2012-11-22 | 2014-06-04 | 北京航空航天大学 | Millimeter wave frequency spectrum analyzer based on array waveguide grating processing |
| US10048354B2 (en) | 2015-08-13 | 2018-08-14 | Texas Instruments Incorporated | Chirp frequency non-linearity mitigation in radar systems |
| CN114124234B (en) * | 2021-11-24 | 2023-11-24 | 南开大学 | Millimeter wave generator based on cascade space symmetric optical fiber F-P resonant cavity |
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