CN106299977A - The device and method of two frequency multiplication photoelectric oscillator based on phase-modulation - Google Patents
The device and method of two frequency multiplication photoelectric oscillator based on phase-modulation Download PDFInfo
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- CN106299977A CN106299977A CN201610846181.9A CN201610846181A CN106299977A CN 106299977 A CN106299977 A CN 106299977A CN 201610846181 A CN201610846181 A CN 201610846181A CN 106299977 A CN106299977 A CN 106299977A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S1/00—Masers, i.e. devices using stimulated emission of electromagnetic radiation in the microwave range
- H01S1/02—Masers, i.e. devices using stimulated emission of electromagnetic radiation in the microwave range solid
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Abstract
The invention discloses a kind of tunable two frequency multiplication photoelectric oscillator based on phase-modulation.This invention relates to microwave technical field and technical field of photo communication, is mainly used in generation microwave local oscillation signal.Described method as shown in drawings, including lasing light emitter, Polarization Controller, circulator, polarization beam apparatus, phase-modulator, photo-coupler, the polarizer, standard single-mode fiber, photodetector, tunable bandpass filters, electric amplifier and electricity the phase shifter.The characteristic that phase-modulator has forward modulation, reversely do not modulates.It is divided into, by photo-coupler, the two paths of signals that power is equal from the optical signal of circulator output.Wherein a road feed back to phase-modulator constitute optical-electronic oscillator obtain fundamental frequency signal.Regulation Polarization Controller suppression light carrier of separately leading up to obtains two frequency multiplication microwave signals.In conjunction with tunable bandpass filters, two frequency multiplication microwave signals of available frequency-tunable.This optical-electronic oscillator frequency tuning range is relatively big, and phase noise is relatively low, can obtain base frequency oscillation signal and two frequency multiplication microwave signals simultaneously.Program simple in construction, flexible adjustment, do not affected by bias drift in conventional strength modulation scheme.
Description
Technical field
The present invention relates to technical field of photo communication and microwave technical field, relate generally to optical communication technique is adjusted based on phase place
The device and method of two frequency multiplication photoelectric oscillator (OEO) of system.
Background technology
Along with microwave photon technology is at the development in the fields such as Aero-Space, radar, radio communication and electronic countermeasure,
High frequency, the microwave signal generation technique of wideband adjustable have important using value.Technology is produced with traditional microwave signal
Comparing, the photonic propulsion of microwave signal produces technology and has high frequency, Low phase noise, wideband adjustable and not by the advantage of electromagnetic interference,
And the relatively easy covering power compatible with other photosystem, remote of system structure is good, transmission capacity is big.
Along with the military and development need of civilian applications, it is desirable to future microwave system have big bandwidth, Larger Dynamic scope with
And the feature such as high sensitivity.Especially in military radar and electronic countermeasure field, requirement to microwave system also can be increasingly
High.Meanwhile, along with raising, the quantity of information of message complexity are more and more abundanter, therefore the performance to information system propose higher,
Tightened up requirement.Wherein, the microwave local oscillation letter that altofrequency, high spectral purity, band wide tunable and phase noise are low is produced
Number seem most important.
OEO is a kind of agitator utilizing Photonics Technology to produce microwave local oscillation, it is possible to directly produce microwave, millimere-wave band
Microwave local oscillation, has potential application in fields such as radar, electronic warfare, accurate measurements.Compared with traditional microwave agitator, OEO
There is relatively low phase noise, and make an uproar mutually and do not significantly increase with the raising of frequency of oscillation, be microwave and millimeter wave, the most too
The potential selection scheme of Hertz wave Low phase noise signal source.OEO can provide electricity, two kinds of input modes of light for information system, can be with
Various electronic systems and optic communication, Microwave photonics system compatible.
In recent years, the method utilizing OEO to produce microwave signal and frequency-doubled signal process has obtained paying close attention to widely.Photoelectricity
Agitator is usually the regenerative feedback loop being made up of light source, intensity modulator, wave filter and amplifier.Due to intensity modulated
The bias drift problem of device, had emerged in large numbers in recent years and has much utilized light polarization modulator, Polarization Controller and the polarizer to be equivalent to by force
The OEO scheme of degree manipulator.But the microwave and millimeter wave signal frequency range that these OEO schemes produce is less, and system is complex,
Involve great expense.
Summary of the invention
In order to solve the technical problem in the presence of background technology, the present invention proposes and a kind of combines based on phase-modulator
The tunable two frequency multiplication OEO methods of Sagnac (Sagnac) ring.Tunable bandpass filters is utilized to realize optical-electronic oscillator
Frequency selects, and obtains the fundamental frequency microwave signal of Low phase noise.Additionally by simple adjustment Polarization Controller suppressed carrier, thus produce
Two frequency multiplication microwave signals of the Low phase noise of frequency-tunable.
The technical solution adopted for the present invention to solve the technical problems is: described device include lasing light emitter, Polarization Controller,
Circulator, polarization beam apparatus, phase-modulator, photo-coupler, the polarizer, photodetector, tunable bandpass filters, electromigration
Phase device, electric amplifier and standard single-mode fiber；Two outfans of polarization beam apparatus input with defeated with phase-modulator respectively
Go out end to be connected, constitute a Sagnac ring；The outfan of lasing light emitter is connected with Polarization Controller, this Polarization Controller other end
Connecting circulator 1 port, circulator 2 port connects polarization beam apparatus input；Circulator 3 port is divided into merit by photo-coupler
The two paths of signals that rate is equal.Wherein a road is sequentially connected with Polarization Controller, the polarizer, single-mode fiber, photodetector, electrically amplified
Device, tunable bandpass filters, electricity phase shifter；The outfan of electricity phase shifter is input to the prevention at radio-frequency port of phase-modulator, thus
Constitute OEO.Another road is sequentially connected with another Polarization Controller, the polarizer, photodetector.The output of every road photodetector
End can connect spectrum analyzer and carry out signal of telecommunication test.
The present invention operationally comprises the following steps:
(1) send, from lasing light emitter, the light wave that wavelength is λ to be injected into Polarization Controller；
(2) regulation Polarization Controller, makes the optical signal that polarization beam apparatus output two-way power is equal, and a curb is the most logical
Crossing polarization maintaining optical fibre and be transferred to phase-modulator, another curb counterclockwise enters phase-modulator by polarization maintaining optical fibre；
(3) optical signal transmitted clockwise will obtain phase-modulation, due to the inherent character of manipulator, along the inverse time
The optical signal of pin direction transmission is not modulated, and phase modulated signal and light carrier form palarization multiplexing light, from circulator 3 end
Mouth output；
(4) optical signal that circulator 3 port exports is divided into, through photo-coupler, the two paths of signals that power is equal.Each road is respectively
After Polarization Controller, the polarizer, phase modulated signal and light carrier interfere with a polarization direction, form intensity modulated letter
Number.Phase-modulator, Sagnac ring and the polarizer are equivalent to intensity modulator, by regulation Polarization Controller, this equivalent strength
The operating point of manipulator can arbitrarily change；
(5) wherein a road optical signal by Polarization Control, the intensity-modulated signal of polarizer output orthogonal point, laggard through optical fiber
Entering photodetector, the signal of telecommunication obtained feeds back to the prevention at radio-frequency port of phase-modulator after electrically amplified, wave filter, phase shift,
Thus constitute OEO loop.Electrical filter realizes frequency-selecting function, and electric amplifier makes link obtain constant gain, meets vibration bar
Fundamental frequency signal is produced after part.
(6) another road optical signal passes through Polarization Control, and the intensity-modulated signal of polarizer output smallest point, light carrier is pressed down
System, obtains two frequency multiplication microwave signals through photodetector beat frequency.
(7) by changing the mid frequency of tunable electricity band filter, the frequency of fundamental frequency signal changes, two frequency multiplication simultaneously
Microwave signal changes the most therewith.
The present invention proposes the device of a kind of tunable two frequencys multiplication OEO.The program utilize phase-modulator, Sagnac ring and
The polarizer, in conjunction with tunable electrical filter, it is achieved that the OEO of frequency-tunable, and by another road Polarization Control, having obtained can
Two frequency multiplication microwave signals of tuning.Present device is simple, has the strongest actual operability.
Owing to have employed phase-modulator, the present invention need not external dc bias voltage, eliminates due to biasing point drift
The problem that shipper pole comes.
This programme need not optical filter, is applied to the voltage of band filter by simple adjustment and can realize photoelectricity and shake
Swing the tunability of device, and tuning range is relatively big, thus the two frequency multiplication microwave signals generated have tunability and tuning range
Bigger.
Accompanying drawing explanation
Fig. 1 is that the present invention is based on phase-modulator and the schematic diagram of tunable two frequencys multiplication OEO of Sagnac ring；Fig. 2 is light
The electricity spectrum overall diagram and thumbnail of the fundamental frequency signal of electric explorer 1 output, (a-d) be respectively frequency of oscillation be 5GHz,
Electric spectrogram when 10GHz, 15GHz, 20GHz；Fig. 3 is electricity spectrum overall diagram and the breviary of defeated two frequency-doubled signals of electric amplifier
Figure, (a-d) is respectively electric spectrogram when frequency of oscillation is 5GHz, 10GHz, 15GHz, 20GHz；Fig. 4 is fundamental frequency signal and two
The phase noise comparison diagram of frequency-doubled signal.
Detailed description of the invention
Below in conjunction with the accompanying drawings embodiments of the invention are elaborated: the present embodiment is being front with technical solution of the present invention
Put and implement, give detailed embodiment and concrete operating process, but under protection scope of the present invention is not limited to
The embodiment stated:
Fig. 1 is that the present invention is based on phase-modulator and the schematic diagram of tunable two frequencys multiplication OEO of Sagnac ring.As it is shown in figure 1,
In the present embodiment, device includes: lasing light emitter, Polarization Controller 1, circulator, polarization beam apparatus, phase-modulator, Polarization Control
Device 2, the polarizer 1, Polarization Controller 3, the polarizer 2, photo-coupler, standard single-mode fiber, tunable bandpass filters, electromigration phase
Device, electric amplifier, photodetector 1, photodetector 2.
In this example, the step that is embodied as of method is:
Step one: light source produces the continuous light carrier wave that operation wavelength is 1552.16nm, input annular after Polarization Controller 1
Device 1 port, circulator 2 port output optical signal enters polarization beam apparatus.Regulation Polarization Controller 1, makes the two of polarization beam apparatus
Road Output optical power is equal.
Step 2: one port of polarization beam apparatus optical signal out enters phase-modulator by polarization maintaining optical fibre forward, obtains
Phase-modulation, the optical signal of another port output inversely enters phase-modulator by polarization maintaining optical fibre, is the most effectively modulated,
It it is still a light carrier.Optical signal and the backlight carrier wave of forward modulation are combined into palarization multiplexing light at polarization beam apparatus, logical
Cross the output of circulator 3 port.
Step 3: from the two ways of optical signals of photo-coupler output, wherein a road enters the polarizer 1 after light polarization modulator 2, and two
The optical signal of individual polarization state synthesizes a branch of polarized light at the polarizer, is then passed through the standard single-mode fiber of 1.98km length.Photoelectricity
Detector 1 conversion gain 600V/W, the signal of telecommunication obtained sequentially passes through 30dB electric amplifier, tunable bandpass filters, electromigration
Phase device, then feeds back to the prevention at radio-frequency port of phase-modulator, constitutes optical-electronic oscillator loop.
Step 4: the bandwidth of tunable bandpass filters is about 50MHz, the voltage that regulation is added on wave filter, its tuning range
In 3-20GHz, experiment have selected mid frequency respectively 5GHz, 10GHz, 15GHz, 20GHz and test.Regulation polarization
Controller 2, makes the modulated signal of the polarizer 1 output orthogonal point, and Fig. 2 (a-d) is respectively 5GHz, 10GHz, 15GHz, 20GHz base
Frequently the electric spectrogram of signal, it can be seen that the fundamental frequency signal harmonics restraint obtained is than respectively 47dB, 44dB, 36dB, 34dB.
Step 5: enter the polarizer 2 after light polarization modulator 3 from another road optical signal of photo-coupler output.By regulation
Polarization Controller 3 can realize suppression maximum to light carrier.Two frequency multiplication microwaves are obtained after photodetector 2 beat frequency
Signal.Fig. 3 (a-d) is respectively the two frequency-doubled signal electricity spectrograms of 10GHz, 20GHz, 30GHz, 40GHz, it can be seen that two frequency multiplication letters
Number harmonics restraint than respectively 38dB, 40dB, 40dB, 45dB.
Step 6: Fig. 4 (a-d) be respectively 5GHz, 10GHz, 15GHz, 20GHz fundamental frequency signal and the 10GHz of correspondence, 20GHz,
30GHz, 40GHz bis-comparison of phase noise of frequency-doubled signal, two frequency-doubled signal phase noises can be decayed 6dB in theory, from figure
In can be seen that both experimental results difference be about 6dB.
To sum up, due to the fact that the OEO that make use of phase-modulator and Sagnac ring to achieve frequency-tunable.Structure
Simply it is easily achieved, cheap, do not affected by electronic bottleneck.The fundamental frequency signal of OEO generation and two frequency multiplication microwaves of generation
The tuning range of signal is relatively big, and phase noise is the lowest.Additionally, due to have employed phase modulation technique, it is not necessary to extra direct current
Biasing circuit, eliminates the various problems brought due to direct current biasing point drift, and system stability is good.
In a word, embodiments described above is only embodiments of the invention, is not only used for limiting the guarantor of the present invention
Protect scope, it is noted that for those skilled in the art, in present disclosure, it is also possible to
Increasing tuning range, the fundamental frequency signal frequency range that optical-electronic oscillator produces is not limited to 3-20GHz, two frequency-doubled signal frequency ranges
Being not limited to 6-40GHz, if the photodetector three dB bandwidth used is bigger, tuning range can be bigger.These equivalent variations and
Replace and the adjustment of frequency range also should be regarded as the scope of protection of the invention.
Claims (5)
1. tunable two frequency multiplication photoelectric oscillator devices based on phase-modulation, including lasing light emitter, Polarization Controller, annular
Device, polarization beam apparatus, phase-modulator, photo-coupler, the polarizer, photodetector, electric amplifier, tunable electrical filter,
Electricity phase shifter and standard single-mode fiber, it is characterised in that: circulator is on the emitting light path of light source, at output polarization beam apparatus
The palarization multiplexing light of synthesis, is divided into, through photo-coupler, the two paths of signals that power is equal, wherein a road be sequentially connected with Polarization Controller,
The polarizer, single-mode fiber, photodetector, electric amplifier, tunable electrical filter, electricity phase shifter, the outfan of electricity phase shifter
It is input to the prevention at radio-frequency port of phase-modulator, constitutes optical-electronic oscillator feedback link.Another road is sequentially connected with another polarization control
Device processed, the polarizer, photodetector, constitute two frequency multiplication links of optical-electronic oscillator.
Two output ports of described polarization beam apparatus connect the input and output side of phase-modulator respectively, constitute Sagnac
(Sagnac) ring.
In described Sagnac ring, forward obtains phase-modulation through the optical signal of manipulator, and the light reverses through phase-modulator is believed
Number modulated.Phase modulated signal and unmodulated light carrier synthesize at polarization beam apparatus.
Described Sagnac ring combines the polarizer, can be equivalent to an intensity modulator, and can be by the polarization before the adjustment polarizer
Controller, changes the operating point of intensity modulator.
In the feedback link of described optical-electronic oscillator, by regulation Polarization Controller, obtain the orthogonal points modulated signal of equivalence, light
Electrical resistivity survey obtains pure fundamental frequency signal after surveying.
In two frequency multiplication links of described optical-electronic oscillator, by regulation Polarization Controller, obtain the smallest point modulated signal of equivalence,
Light carrier is inhibited, and obtains two pure frequency-doubled signals after photodetection.
The device of tunable two frequency multiplication photoelectric oscillator based on phase-modulation the most according to claim 1, its feature exists
In, by regulation electrical filter band connection frequency, fundamental frequency can be changed, and then two frequency multiplication frequencies change therewith.
The device of tunable two frequency multiplication photoelectric oscillator based on phase-modulation the most according to claim 1, its feature exists
In: described manipulator is phase-modulator, it is not necessary to extra direct current biasing control circuit.
The device of tunable two frequency multiplication photoelectric oscillator based on phase-modulation the most according to claim 1, its feature exists
In: utilize Polarization Controller to combine the polarizer, be allowed to be equivalent to orthogonal points modulation.
The device of tunable two frequency multiplication photoelectric oscillator based on phase-modulation the most according to claim 1, its feature exists
In: utilize Polarization Controller to combine the polarizer, be allowed to be equivalent to smallest point modulation, carried by the suppression of simple adjustment Polarization Controller
Ripple realizes two frequencys multiplication.
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Cited By (6)
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| CN107123919A (en) * | 2017-06-26 | 2017-09-01 | 湖南工学院 | Optical signal processing method and the optical-electronic oscillator directly demodulated based on phase-modulation |
| CN109450551A (en) * | 2018-11-30 | 2019-03-08 | 北京邮电大学 | A kind of multi-octave phase-moving method and device |
| CN109669189A (en) * | 2019-01-19 | 2019-04-23 | 南京合太光电科技有限公司 | Wide range, the high-precision absolute distance meter device being switched fast based on OEO |
| CN110350983A (en) * | 2019-08-13 | 2019-10-18 | 西北工业大学 | Microwave photon self-interference signal eliminating apparatus and adjusting method based on Sagnac ring |
| CN111614405A (en) * | 2020-05-25 | 2020-09-01 | 济南浪潮高新科技投资发展有限公司 | Image rejection mixer based on double parallel phase modulators |
| CN114002787A (en) * | 2021-11-04 | 2022-02-01 | 中国人民解放军国防科技大学 | Optical fiber coherent array phase control system based on probe light |
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| CN105763260A (en) * | 2016-01-16 | 2016-07-13 | 西安电子科技大学 | Device and method of generating triangular waves by using phase modulator and Sagnac ring |
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| CN103188019A (en) * | 2013-03-08 | 2013-07-03 | 华南理工大学 | Microwave signal source based on dual-wavelength single-frequency optical fiber laser |
| CN104051935A (en) * | 2014-06-26 | 2014-09-17 | 中国科学院半导体研究所 | Quadruplicated frequency microwave signal generating device based on photoelectric oscillator |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107123919A (en) * | 2017-06-26 | 2017-09-01 | 湖南工学院 | Optical signal processing method and the optical-electronic oscillator directly demodulated based on phase-modulation |
| CN109450551A (en) * | 2018-11-30 | 2019-03-08 | 北京邮电大学 | A kind of multi-octave phase-moving method and device |
| CN109669189A (en) * | 2019-01-19 | 2019-04-23 | 南京合太光电科技有限公司 | Wide range, the high-precision absolute distance meter device being switched fast based on OEO |
| CN110350983A (en) * | 2019-08-13 | 2019-10-18 | 西北工业大学 | Microwave photon self-interference signal eliminating apparatus and adjusting method based on Sagnac ring |
| CN110350983B (en) * | 2019-08-13 | 2022-05-24 | 西北工业大学 | Microwave photon self-interference signal eliminating device based on Sagnac loop and adjusting method |
| CN111614405A (en) * | 2020-05-25 | 2020-09-01 | 济南浪潮高新科技投资发展有限公司 | Image rejection mixer based on double parallel phase modulators |
| CN114002787A (en) * | 2021-11-04 | 2022-02-01 | 中国人民解放军国防科技大学 | Optical fiber coherent array phase control system based on probe light |
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