CN100427982C - Microwave millimetric wave subcarrier optical signal generator - Google Patents
Microwave millimetric wave subcarrier optical signal generator Download PDFInfo
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- CN100427982C CN100427982C CNB2006101162672A CN200610116267A CN100427982C CN 100427982 C CN100427982 C CN 100427982C CN B2006101162672 A CNB2006101162672 A CN B2006101162672A CN 200610116267 A CN200610116267 A CN 200610116267A CN 100427982 C CN100427982 C CN 100427982C
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Abstract
The invention relates to a microwave millimeter-wave subcarrier wave light signal generator, wherein it is formed by F-P fiber, lens, optical fiber and high-speed photoelectric diode; said lens is at the output surface of F-P fiber; the input of optical fiber is at the focus of said lens; the output of optical fiber is connected to the high-speed photoelectric diode. The invention has stable operation, low cost and wide application.
Description
Technical field
The present invention relates to communication system, is a kind of based on Fabry-Perot (Fabry-Perot) the interfere type wave filter microwave millimetric wave subcarrier optical signal generator of (being called for short the F-P wave filter).Be mainly used in the generation of the light signal of microwave, millimeter wave modulation, the monotechnics of necessity is provided for application such as the Radio Over Fiber communication system in following broadband, microwave and millimeter wave communication, radar, microwave signal processing.
Background technology
Along with technology rapid development such as mobile communication technology, wireless access networks, more and more higher to the demand of the message capacity of subcarrier.In order to improve the capacity of information, electromagnetic frequency must further improve.Bringing up to millimeter wave band from present microwave region, is that the next generation comprises that the various correlation techniques of radio communication develop most promising target, are subjected to the attention of various countries scientific and technological circle.In this technology, the information transmission of front end still can adopt optical fiber; But the light wave that transmits in optical fiber is the light wave of a millimeter wave modulation, and information is loaded on the millimeter wave subcarrier.On the base station, after being received, light wave is converted into millimeter wave, directly launch from free space, arrive each mobile subscriber's receiving terminal.Therefore millimetric wave subcarrier optical signal generator is a key element in this technology.In microwave technical field, optical fiber and optical device also have the important application prospect.Adopt optical fiber and photonic device, the volume weight of microwave device is reduced greatly, speed and control accuracy improve greatly, and cost reduces.
In the research and development of millimetric wave subcarrier optical signal generator, multiple scheme has been proposed.One of technology formerly is to adopt two to have the mode of certain frequency laser instrument at interval by beat effect and produce continuous millimeter wave subcarrier signal [IEEE Photonics Technol.Lett., Vol.10, No.5,1998, p728; J.Light-wave Technol., Vol.17, No.2,1999, p328].This method on the optics adjustment technology difficulty than higher.For the research work that utilizes ultrashort pulse train to produce the millimeter wave subcarrier signal, many reports are arranged also in recent years.Formerly two of technology, D.McKinney etc. have proposed to utilize a diffraction grating and space lamina membranacea to produce the millimeter wave subcarrier pulse signal of random waveform at [OpticsLetters, Vol.27, No.15,2002, p1345].Formerly three of technology, above-mentioned scheme is improved, utilize an empty phased array device to replace diffraction grating [IEEE Photonics Technol.Lett., Vol.16, No.8,2004, p1936], the time domain cycle of bigger pulse signal and the detection intensity of radiofrequency signal have been realized, as shown in Figure 1.It incides on the window of an empty phased array after focusing on by the ultrashort pulse sequence collimation with laser instrument output, and the multiple beam of output is coupled into optical fiber through a space lamina membranacea, produces the pulse train of the millimere-wave band of certain waveform.But empty phased array device architecture more complicated, cost is than higher.Formerly four of technology [J.Lightwave Technol., Vol.21, No.5,1999, p1179] report that chromatic dispersion and the nonlinear characteristic of utilizing high birefringence optical fiber realize that the polarization interference effect produces the method for millimeter wave modulating light pulse, as shown in Figure 2.This method is controlled very difficulty in the operation of reality.Formerly five of technology, [Chinese invention patent, application number: 200510031023.X] utilizes and becomes the filtering frequency-selecting that mark More fiber grating is realized certain intervals, then by in the pulse from beat frequency generation millimeter wave carrier.As shown in Figure 3.It also has advantage cheaply.But the frequency that produces millimeter wave subcarrier is difficult for regulating, and its frequency is subjected to the stability of the temperature effect of external environment to be still waiting check.
Summary of the invention
The technical problem to be solved in the present invention is to overcome above-mentioned the deficiencies in the prior art, propose a kind of microwave millimetric wave subcarrier optical signal generator, it is reliable that this optical signal generator should have working stability, and manufacture craft is stable, ripe, cheap, as to be easy to apply characteristics.
Technical solution of the present invention is as follows:
A kind of microwave millimetric wave subcarrier optical signal generator, it is characterized in that it is made of F-P wave filter, lens, optical fiber and high-speed photodiode successively, after described lens are positioned at the output face of F-P wave filter, the input end of described optical fiber is positioned at the focus of described lens, and the output terminal of described optical fiber links to each other with described high-speed photodiode.
Described F-P wave filter is the long F-P wave filter of lock chamber, the tuning F-P wave filter of piezoelectricity, magnetostrictive tuning F-P wave filter, the tuning F-P wave filter of incident angle, electro-optical tuning F-P wave filter, thermo-optical tunability F-P wave filter or active F-P wave filter.
The long F-P wave filter of described lock chamber is the F-P wave filter that is connected by optical fiber, and its formation is: two also optical fiber collimator opposing parallel storings of evaporation highly reflecting films of end face polishing are air between the both ends of the surface, fixedly form by a holder again.
The formation of the tuning F-P wave filter of described piezoelectricity is: two end faces polish to be fixed by two optical fiber collimator holders respectively after also the optical fiber collimator opposing parallel of evaporation highly reflecting films is put, in the top and bottom of described two optical fiber collimator holders the lead zirconate titanate piezoelectric piece is set, two lead zirconate titanate piezoelectric pieces link to each other with a controllable voltage source respectively, and two piezoelectric lead zirconate titanate pieces stretch with the variation of the voltage of this controllable voltage source and realize long tuning in the chamber of the tuning F-P wave filter of described piezoelectricity.
The formation of described magnetostrictive tuning F-P wave filter is: two end faces polish to be fixed by two optical fiber collimator holders respectively after also the optical fiber collimator opposing parallel of evaporation highly reflecting films is put, top and bottom at described two optical fiber collimator holders are provided with magnetostriction materials, coiling solenoid on these magnetostriction materials, these solenoid two ends apply the driver of controllable current.
The formation of the tuning F-P wave filter of described incident angle is: be coated with at two end faces between the optical fiber collimator of routine of antireflecting film and insert two blocks of wedge shape optical flats, the one side of this wedge shape optical flat is coated with highly reflecting films, another side coated with antireflection film, the two-supremes reflecting surface is staggered relatively, and adjust to parallel, constitute a F-P chamber and be fixed on the stand, this stand connects a micromotor or piezoelectric actuator, under driving power drives, drive described stand and rotate, regulate the light path that incident angle is come tuning F-P chamber.
The formation of described electro-optical tuning F-P wave filter is: an electro-optic crystal is set between two conventional fiber collimating apparatuss, the two parallel end faces plating highly reflecting films of this electro-optic crystal, constitute a F-P chamber, an external electric field that is provided by driver is provided this electro-optic crystal, the optical length nd in the chamber of this F-P wave filter will change with the variation of the refractive index n of this electro-optic crystal, thereby cause the tuning of resonance wavelength, promptly export the tuning of millimeter-wave frequency.
The formation of described thermo-optical tunability F-P wave filter is: a hot luminescent crystal with higher thermo-optical coeffecient is set between two conventional fiber collimating apparatuss, its parallel both ends of the surface plating highly reflecting films, constitute a F-P chamber, this hot luminescent crystal contacts with well heater or refrigerator, and this well heater or refrigerator link to each other with a temperature control power supply.
The formation of described active F-P wave filter is: the chip that the semiconductor laser instrument is set between two conventional fiber collimating apparatuss, the both ends of the surface of the chip of this semiconductor laser are coated with highly reflecting films, the lenticule of the end points of described optical fiber collimator and the chip of this semiconductor laser are coupled, the chip of this semiconductor laser just constitutes a F-P wave filter with gain, and the chip of described semiconductor laser is by driving power injection current controllably.
The present invention has following advantage:
1, the F-P wave filter is a passive device, and working stability is reliable.
2, F-P wave filter manufacture craft is stable, ripe, cheap, is easy to apply.
3, can be long or/and incident angle is realized the tuning of millimeter-wave frequency by the chamber that changes the F-P wave filter, can be used for different communication forms such as frequency shift keying, phase-shift keying (PSK).
4, because the F-P wave filter has periodic filtering characteristic, the peak wavelength and the seeing through of wave filter of input pulse there are not strictness to alignment request between the peak, can be used for the different LASER Light Source of same wave band.
5, the millimeter wave modulation signal of Chan Shenging has the precipitous characteristics in forward position, helps discriminating and detection in the receiving end pulse.
6, utilize active F-P wave filter, promptly have the F-P cavity resonator structure of gain, can adjust and control the amplitude of millimeter wave modulating light pulse, adjust the flatness at its top; Adjust and control the duration of light pulse; Adjust and control the repetition frequency of millimeter wave.
Description of drawings
Fig. 1 is the empty phased array scheme of two the utilization synoptic diagram of technology formerly
Fig. 2 formerly technology three utilize chromatic dispersion and non-linear scheme synoptic diagram
Fig. 3 is four change mark More fiber grating scheme synoptic diagram of technology formerly
Fig. 4 is the basic structure schematic diagram of microwave millimetric wave subcarrier optical signal generator of the present invention
The structural representation of Fig. 5 embodiment of the invention 1
Fig. 6 is by the output optical pulse waveform of designed F-P wave filter
The structural representation of Fig. 7 embodiment of the invention 2
The structural representation of Fig. 8 embodiment of the invention 3
The structural representation of Fig. 9 embodiment of the invention 4
The structural representation of Figure 10 embodiment of the invention 5
The structural representation of Figure 11 embodiment of the invention 6
The structural representation of Figure 12 embodiment of the invention 7
Figure 13 adopts the microwave of F-P wave filter of the present invention, the block diagram that the millimeter wave optical signal generator is realized the FSK communication mode
Embodiment
The invention will be further described below in conjunction with embodiment and accompanying drawing, but should not limit protection scope of the present invention with this.
See also Fig. 4 earlier, Fig. 4 is the basic structure schematic diagram of microwave millimetric wave subcarrier optical signal generator of the present invention, as seen from the figure, microwave millimetric wave subcarrier optical signal generator of the present invention is made of F-P wave filter 1, lens 2, optical fiber 3 and high-speed photodiode 4 successively, after described lens 2 are positioned at the output face of F-P wave filter 1, the input end of described optical fiber 3 is positioned at the focus of described lens 2, and the output terminal of described optical fiber 3 links to each other with described high-speed photodiode 4.
Among the figure, it is that R, spacing are the F-P wave filter 1 that two minute surfaces of d constitute that light pulse is incided by reflectivity, comes back reflective at two interfaces of this wave filter 1, exports an equally spaced in time train of impulses, forms the light pulse envelope of a high frequency modulated.
Distance between two level crossings of described F-P wave filter, or claim that the chamber is long and be d, refractive index is n in the chamber, and incident light pulse is θ with the angle of normal direction in the chamber, and the light velocity is c, and then exporting the recurrent interval is Δ T=2nd/ (ccos θ).Can obtain thus, the high frequency modulated frequency of the optical pulse train correspondence of output is f=1/ Δ T=(ccos θ)/(2nd).In the train of impulses envelope, peak value of pulse is index decreased in time, and damping time constant is Δ T/ln (1/R).According to the basic transmission equation of F-P wave filter, spectrum and waveform that can the analog computation output optical pulse, as shown in Figure 6.Suitably design the long d in chamber of F-P wave filter, the refractive index n of material therefor, the reflectivity R of minute surface just can be transformed to the laser pulse of a ps magnitude pulse train that is spaced apart microwave, millimeter-wave frequency.Scioptics 2 are coupled into optical fiber 3.And the opto-electronic conversion by high-speed photodiode 4, the radio frequency beam that obtains millimeter-wave frequency is launched, as shown in Figure 4.
According to above-mentioned ultimate principle, can obtain the relation of the main structure parameters of F-P wave filter and needed microwave, millimeter wave subcarrier output performance.The repetition period that produces pulse train is Δ T=2nd/ (ccos θ); Microwaves corresponding or millimeter-wave frequency are f=1/ Δ T.For the passive F-P wave filter that does not gain, the changes in amplitude of pulse train is I (t)=I
0Exp (t/T
d), wherein damping time constant is, T
d=Δ T/ (lnR
-1).These basic parameters have been determined the microwave that produces, the fundamental property of millimetric wave subcarrier optical signal.
By regulating the long d in chamber, refractive index n or the incident angle θ of F-P wave filter, microwave that just can tuning generation, the frequency f of millimeter wave
cThe reflectivity R of two level crossings by changing the F-P wave filter, or utilize the F-P cavity configuration that gain is arranged, can change the microwave of output, the waveform of millimetric wave subcarrier optical signal.
According to thought of the present invention, embodiments of the invention are as follows:
Adopt the long F-P of lock chamber, as shown in Figure 5.6 is a pulse shortener among the figure, realizes the pulsewidth compression to the incident light pulse signal, with the microwave that obtains to have High Extinction Ratio, the light pulse of millimeter wave modulation.7 is a fiber amplifier, remedying the loss of energy in the light pulse transfer process, and satisfies the needs of microwave, millimeter wave conversion.11 is the F-P wave filter that the long optical fiber of a kind of lock chamber connects.Illustration in the circle shows the structure of its amplification, and 111 and 112 is two optical fiber collimators, its end face polishing, and evaporation high reflectance mould; Be air between the both ends of the surface, constitute a F-P chamber that refractive index equals 1.The spacing of both ends of the surface is made according to designing requirement.110 is a stand of fixing two optical fiber collimators 111 and 112.For the long roughly numerical value of F-P filter cavity is had a notion, can do following design, as an example: the millimeter-wave frequency of requirement is 62.5GHz; The wavelength that is millimeter wave is 4.8mm, and the cycle is 16 psecs.The spacing of fiber end face is 2.4mm.The reflectivity of fiber end face is about 80%.Fig. 6 is one and carries out the output waveform that analog computation obtains by this design.
Be to adopt the long tunable F-P wave filter that changes in chamber.Fig. 7 is a kind of tunable F-P wave filter 12 that adopts piezoelectric effect.1101 and 1102 stands among the figure for difference fixed fiber collimating apparatus 111 and 112.121 is piezoelectric.Generally can adopt lead zirconate titanate (PZT) material.The 1211st, piezoelectric is applied the voltage source that can control.Piezoelectric can take place flexible under the voltage effect, thereby adjusts the length in F-P chamber.
Embodiment 3
Be a kind of tuning F-P wave filter of magnetostriction materials that utilizes, shown in frame of broken lines among Fig. 8 13.131 is magnetostriction materials among the figure, and it can take place flexible under the action of a magnetic field.1310 for producing the solenoid in magnetic field among the figure.1311 for applying the driver of controllable current to solenoid.
Be that a kind of beam incident angle degree that changes carries out tuning tunable F-P wave filter, shown in frame of broken lines among Fig. 9 14.142 is conventional optical fiber collimator in this structure, and in other words, its end face is coated with antireflecting film, to reduce to insert loss.141 is non-parallel optical flat, and it simultaneously is coated with the high reflection film of designing requirement reflectivity, and another side is coated with antireflection rate film; Two high reflectance faces are staggered relatively, and adjust to parallelly, constitute a F-P chamber, are fixed on the stand 143.Stand 143 connection micromotor or piezoelectric actuators 144 can rotate under driving power 1441 drives, thereby come the light path in tuning F-P chamber by the adjusting of incident angle.
Embodiment 5
Be a kind of tunable F-P wave filter that adopts electrooptical material, its structure is shown in the frame of broken lines among Figure 10 15.In this structure, adopt the conventional fiber collimating apparatus 142 identical with the foregoing description 3.151 is electro-optic crystals among the figure, and its parallel both ends of the surface have been plated the highly reflecting films of designing requirement, constitutes a F-P chamber.The refractive index n of electro-optic crystal 151 can change under the effect of the external electric field that is provided by driver 1511, the optical length nd in F-P chamber is changed thereupon, thereby cause the tuning of resonance wavelength, promptly exports the tuning of millimeter-wave frequency.
Embodiment 6
Be a kind of tunable F-P wave filter that adopts hot luminescent material, shown in frame of broken lines among Figure 11 16.In this embodiment, also adopt the conventional fiber collimating apparatus 142 identical with the foregoing description 3.161 is a material with higher thermo-optical coeffecient among the figure, and its parallel both ends of the surface have been plated the highly reflecting films of designing requirement, constitutes a F-P chamber.The refractive index n of hot luminescent crystal 161 can change along with variation of temperature.1610 is one and contacted heating of hot luminescent material or refrigerator among the figure, such as the semiconductor cooler that adopts Peltier effect.1612 is a temperature sensor, so that temperature information is provided, carries out FEEDBACK CONTROL.1611 is a temperature control power supply.According to design and practical requirement, change heating or refrigeration electric current, and carry out FEEDBACK CONTROL according to the temperature value that temperature sensor provides, the optical length nd in F-P chamber is adjusted on the needed harmonic peak position, export the millimeter wave of required frequency.
Be the F-P wave filter that a kind of employing has the gain of light, also can be called the active F-P wave filter.Shown in frame of broken lines among Figure 12 17.In this structure, core is the chip 171 of a semiconductor laser.It has the gain of light that can control under injection current.Its length is according to designing requirement preparation or selection.The high reflection film of evaporation designing requirement on its both ends of the surface.The chip of such semiconductor laser just constitutes a F-P wave filter with gain.Having prepared lenticular optical fiber 172 at end points is coupled with chip of laser 171.The injection current of chip of laser is provided by driving power 1711, and may command.
Adopt the course of work and the benefit thereof in active F-P chamber as follows:
When incident light pulse injects the F-P chamber, chip of laser 171 is applied a square wave pulsed current, make it in the pulse current time 1, have certain gain.So just can remedy in this instructions " summary of the invention " a joint said because the decay of the reflected optical power luminous power amplitude that reduces to cause one by one.The waveform that can be different from decay shown in Figure 6 obtains flat-top or near the optical pulse train of flat-top.The right oval frame list of illustrations is understood the improvement of output optical pulse string waveform among Figure 12.Dotted line is the waveform of decay, and solid line is for providing the improvement of the waveform that obtains after the gain to the F-P chamber.Two double-head arrows on the waveform are illustrated on the amplitude of pulse and two parameters of width and can adjust.Refractive index owing to semiconductor laser chip inside can obtain adjusting by working current in addition, so the microwave of tuning output thus, millimeter wave frequency and phase place.
Utilize microwave of the present invention, millimeter wave optical signal generator, can realize the subcarrier communication of on-off keying OOK (On-Off Keying) mode; Can also realize the communication mode of frequency shift keying fsk (FrequencyShift Keying).Figure 13 is a kind of technical scheme of utilizing the realization FSK of microwave of the present invention, millimeter wave optical signal generator.The data-signal of input is an example with 1001 in the drawings, and before inciding device of the present invention, by the semiconductor laser of phase inverter and two kinds of wavelength, being converted to the wavelength is the light signal of carrier, i.e. λ among the figure
1-λ
2-λ
2-λ
1Pulse train.This transfer process has been done to be described in detail in inventor's previous invention (application number: on June 28th, 200510112239.9,2006 is open).The pulse train of this incident is through a wavelength division multiplexer 51, and with the light wave of two kinds of wavelength separately, inciding corresponding to microwave, millimeter-wave frequency respectively is f
1And f
2 F-P wave filter 101 and 102, the light pulse of output two bundle different wave lengths, different modulating frequencies; This two-beam ripple closes ripple to an optical fiber by wavelength division multiplexer 52; Through image intensifer 6, obtain enough power, on photo-detector 4, be converted to high frequency electrical signal, to the free space radiation.In this microwave, millimeter-wave signal, frequency f
1Corresponding to 1 of incident data signals; Frequency f
2Corresponding to 0 of incident data signals.Therefore, can finish a kind of frequency shift keyed message transmitting procedure.
Claims (9)
1, a kind of microwave millimetric wave subcarrier optical signal generator, it is characterized in that it is made of F-P wave filter (1), lens (2), optical fiber (3) and high-speed photodiode (4) successively, after described lens (2) are positioned at the output face of F-P wave filter (1), the input end of described optical fiber (3) is positioned at the focus of described lens (2), and the output terminal of described optical fiber (3) links to each other with described high-speed photodiode (4).
2, microwave millimetric wave subcarrier optical signal generator according to claim 1 is characterized in that described F-P wave filter (1) is the long F-P wave filter of lock chamber, the tuning F-P wave filter of piezoelectricity, magnetostrictive tuning F-P wave filter, the tuning F-P wave filter of incident angle, electro-optical tuning F-P wave filter, thermo-optical tunability F-P wave filter or active F-P wave filter.
3, microwave millimetric wave subcarrier optical signal generator according to claim 2, it is characterized in that the long F-P wave filter of described lock chamber is the F-P wave filter that is connected by optical fiber, its formation is: two also optical fiber collimator opposing parallel storings of evaporation highly reflecting films of end face polishing, be air between the both ends of the surface, fixedly form by a holder again.
4, microwave millimetric wave subcarrier optical signal generator according to claim 2, the formation that it is characterized in that the tuning F-P wave filter of described piezoelectricity is: two end faces polish to be fixed by two optical fiber collimator holders respectively after also the optical fiber collimator opposing parallel of evaporation highly reflecting films is put, in the top and bottom of described two optical fiber collimator holders the lead zirconate titanate piezoelectric piece is set, two lead zirconate titanate piezoelectric pieces link to each other with a controllable voltage source respectively, and two lead zirconate titanate piezoelectric pieces stretch with the variation of the voltage of this controllable voltage source and realize long tuning in the chamber of the tuning F-P wave filter of described piezoelectricity.
5, microwave millimetric wave subcarrier optical signal generator according to claim 2, the formation that it is characterized in that described magnetostrictive tuning F-P wave filter is: two end faces polish to be fixed by two optical fiber collimator holders respectively after also the optical fiber collimator opposing parallel of evaporation highly reflecting films is put, top and bottom at described two optical fiber collimator holders are provided with magnetostriction materials, coiling solenoid on these magnetostriction materials, these solenoid two ends apply the driver of controllable current.
6, microwave millimetric wave subcarrier optical signal generator according to claim 2, the formation that it is characterized in that the tuning F-P wave filter of described incident angle is: be coated with at two end faces between the optical fiber collimator of routine of antireflecting film and insert two blocks of wedge shape optical flats, the one side of this wedge shape optical flat is coated with highly reflecting films, another side coated with antireflection film, the two-supremes reflecting surface is staggered relatively, and adjust to parallel, constitute a F-P chamber and be fixed on the stand, this stand connects a micromotor or piezoelectric actuator, under driving power drives, drive described stand and rotate, regulate the light path that incident angle is come tuning F-P chamber.
7, microwave millimetric wave subcarrier optical signal generator according to claim 2, the formation that it is characterized in that described electro-optical tuning F-P wave filter is: an electro-optic crystal is set between two conventional fiber collimating apparatuss, the two parallel end faces plating highly reflecting films of this electro-optic crystal, constitute a F-P chamber, an external electric field that is provided by driver is provided this electro-optic crystal, the optical length nd in the chamber of this F-P wave filter will change with the variation of the refractive index n of this electro-optic crystal, thereby cause the tuning of resonance wavelength, promptly export the tuning of millimeter-wave frequency.
8, microwave millimetric wave subcarrier optical signal generator according to claim 2, the formation that it is characterized in that described thermo-optical tunability F-P wave filter is: a hot luminescent crystal with higher thermo-optical coeffecient is set between two conventional fiber collimating apparatuss, the parallel both ends of the surface plating highly reflecting films of this hot luminescent crystal, constitute a F-P chamber, this hot luminescent crystal contacts with well heater or refrigerator, and this well heater or refrigerator link to each other with a temperature control power supply.
9, microwave millimetric wave subcarrier optical signal generator according to claim 2, the formation that it is characterized in that described active F-P wave filter is: the chip that the semiconductor laser instrument is set between two conventional fiber collimating apparatuss, the both ends of the surface of the chip of this semiconductor laser are coated with highly reflecting films, the lenticule of the end points of described optical fiber collimator and the chip of this semiconductor laser are coupled, the chip of this semiconductor laser just constitutes a F-P wave filter with gain, and the chip of described semiconductor laser is by driving power injection current controllably.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5680139A (en) * | 1994-01-07 | 1997-10-21 | Millitech Corporation | Compact microwave and millimeter wave radar |
| CN1752781A (en) * | 2005-10-21 | 2006-03-29 | 中国科学院上海光学精密机械研究所 | Optical fiber optical grating mm wave converter and preparation method thereof |
| US20060083464A1 (en) * | 2004-10-18 | 2006-04-20 | Myoung Sook Oh | Millimeter wave oscillator using fiber bragg grating |
| CN200972556Y (en) * | 2006-09-20 | 2007-11-07 | 中国科学院上海光学精密机械研究所 | Microwave millimeter wave subcarrer optical signal generator |
-
2006
- 2006-09-20 CN CNB2006101162672A patent/CN100427982C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5680139A (en) * | 1994-01-07 | 1997-10-21 | Millitech Corporation | Compact microwave and millimeter wave radar |
| US20060083464A1 (en) * | 2004-10-18 | 2006-04-20 | Myoung Sook Oh | Millimeter wave oscillator using fiber bragg grating |
| CN1752781A (en) * | 2005-10-21 | 2006-03-29 | 中国科学院上海光学精密机械研究所 | Optical fiber optical grating mm wave converter and preparation method thereof |
| CN200972556Y (en) * | 2006-09-20 | 2007-11-07 | 中国科学院上海光学精密机械研究所 | Microwave millimeter wave subcarrer optical signal generator |
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