CN107123919B - Optical signal processing method and the optical-electronic oscillator directly demodulated based on phase-modulation- - Google Patents
Optical signal processing method and the optical-electronic oscillator directly demodulated based on phase-modulation- Download PDFInfo
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- CN107123919B CN107123919B CN201710492146.6A CN201710492146A CN107123919B CN 107123919 B CN107123919 B CN 107123919B CN 201710492146 A CN201710492146 A CN 201710492146A CN 107123919 B CN107123919 B CN 107123919B
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Abstract
Optical signal processing method and the optical-electronic oscillator directly demodulated based on phase-modulation-, it is related to optic communication and optical information processing technique field, wherein, described based on the optical-electronic oscillator that phase-modulation-directly demodulates includes laser, electro-optic phase modulator, narrow-band optical filter 1, optical circulator, transmission-type fiber grating, optical phase shifter, photo-coupler, fiber delay line, narrow-band optical filter 2, photodetector, electric amplifier, electric coupler and narrowband electrical filter.Electro-optic phase modulator is not necessarily to control circuit in the optical-electronic oscillator, it overcomes Traditional photovoltaic oscillator operation point control circuit and introduces the problem of additional noise deteriorates the index of mutually making an uproar of oscillator signal, it is demodulated again after area of light handles signal, mutually converting for electric light is carried out by the way of " phase-modulation-directly demodulates ", it avoids electro-optic intensity modulator operating point in Traditional photovoltaic oscillator and is difficult to stable disadvantage, improve the long-time stability of optical-electronic oscillator.
Description
Technical field
The present invention relates to optic communication and optical information processing technique field, in particular to a kind of optical signal processing method and base
In the optical-electronic oscillator that phase-modulation-directly demodulates.
Background technique
Overstable oscillation device is the core of electronic communication system.The microwave oscillator of high quality optic communication, satellite communication,
The directions such as microwave communication and high-acruracy survey play an important role.Optical-electronic oscillator (Opto-electronic
Oscillator, OEO) based on the unique advantages such as fiber delay line low-loss, big bandwidth it can generate pole Low phase noise and not with vibration
Swing the raising of frequency and increase, be overstable microwave, millimeter wave oscillation source it is high-quality alternative.It shakes as a kind of typical feedback-type
Swing device, the basic principle of optical-electronic oscillator are as follows: the continuous light that laser issues is oscillated signal strength through electro-optic intensity modulator
Photodetector front end is transmitted through the fiber to after modulation, modulated optical signal is converted to electric signal by photodetector, using
Frequency-selecting, amplification finally feed back to modulator electrical input, are then recycled next time, meet Barkhausen oscillation condition and (open
Ring gain be greater than 1, differ as the integral multiple of 2 π) frequency point ultimately form stable oscillator signal.
Traditional photovoltaic oscillator generally uses electro-optic intensity modulator to cooperate photodetector, based on " intensity modulated-is direct
The mode of demodulation " (Intensity Modulation-Direct Demodulation, IM-DD) (is modulated using electro-optic intensity
Device carries out intensity modulated to light carrier, is directly demodulated after delay, i.e., so-called IM-DD mode) come realize electrical/optical and light/
The mutual conversion of electricity has the following deficiencies: that on the one hand, the operating point of electro-optic intensity modulator is difficult to stablize, and causes the steady of system
Qualitative difference；On the other hand, working point control circuit can introduce additional noise, so that the index deterioration of mutually making an uproar of oscillator signal.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of optical-electronic oscillators directly demodulated based on phase-modulation-, lead to
Electro-optic phase modulator is crossed instead of intensity modulator, and is demodulated again after area of light handles signal, that is, uses PM-DD
Mode carry out the mutual conversion of electric light, to overcome the shortcomings of traditional technology.Further, equally it is based on phase-modulation-
The technical thought directly demodulated the present invention also provides a kind of optical signal processing method and generates high stability microwave and millimeter wave source
Method.
In order to solve the above-mentioned technical problem, the present invention adopts the following technical scheme: a kind of directly demodulated based on phase-modulation-
Optical-electronic oscillator, comprising: laser, electro-optic phase modulator, narrow-band optical filter 1, optical circulator, transmission-type optical fiber light
Grid, optical phase shifter, photo-coupler, fiber delay line, narrow-band optical filter 2, photodetector, electric amplifier, electric coupler with
And narrowband electrical filter；
The laser is connected to the light input end of electro-optic phase modulator, and the output end of the electro-optic phase modulator connects
Connect the input terminal of narrow-band optical filter 1, the input terminal of the output end connection optical circulator of the narrow-band optical filter 1；
Two output ends of the optical circulator input terminal with the input terminal of transmission-type fiber grating and optical phase shifter respectively
Connection, the output end of the transmission-type fiber grating and the output end of optical phase shifter are connected to two input terminals of photo-coupler；
It is connected between the output end of the photo-coupler and the input terminal of narrow-band optical filter 2 by fiber delay line, institute
The input terminal of the output end and photodetector of stating narrow-band optical filter 2 connects, and the output end of the photodetector connects electricity
The input terminal of amplifier, the output end of the electric amplifier reconnect the input terminal of electric coupler；
One output end of the electric coupler is as microwave output end, another output end and the narrowband electricity of the electric coupler
The input terminal of filter is connected, and the output end of the narrowband electrical filter reconnects the electrical input of electro-optic phase modulator.
As another aspect of the present invention, a kind of optical signal processing method, comprising the following steps:
1) phase-modulation:
Phase-modulation is carried out to light carrier, after the light carrier passes through phase-modulation, is constituted on frequency domain with carrier component
Centered on, equally spaced frequency spectrum cluster, include two symmetrical sidebands in the frequency spectrum cluster, in two symmetrical sidebands of the frequency spectrum cluster,
Odd times side band phase is on the contrary, even side band phase is consistent.
2) high-order inhibits:
High-order sideband in modulated optical signal is inhibited, carrier component and two single orders in former spectrum are only retained
The optical signal of sideband, sound intervals and the opposite in phase such as described two single order sidebands and carrier component.
3) phasing back:
The optical signal that step 2) is obtained is separated into the first optical signal and the second optical signal, in described two single order sidebands
One single order sideband and carrier component constitute the first optical signal, another single order sideband in described two single order sidebands constitutes the
Two optical signals；
180 degree phase shift is carried out to second optical signal, then it is subjected to multiplex, multiplex gained with first optical signal
The spectrum of optical signal is made of a carrier component and two equiphase single order sidebands.
Wherein, phase-modulation is carried out to light carrier by electro-optic phase modulator in the step 1).
Wherein, high-order sideband is inhibited by narrow-band optical filter 1 in the step 2).
Wherein, it is separated in the step 3) by optical circulator and transmission-type fiber grating pair optical signal；The light
An output port of the signal through optical circulator reaches transmission-type fiber grating, and the carrier component passes through with a single order sideband
Become the first optical signal after transmission-type fiber grating, another single order sideband is transmitted type fiber grating and reflects again from the ring of light
The another output mouth of shape device is output into the second optical signal.
Further, 180 degree phase shift is carried out to the second optical signal by optical phase shifter in the step 3).
Further, the second optical signal and first optical signal are closed by photo-coupler in the step 3)
Wave.
As another aspect of the present invention, a method of high stability microwave and millimeter wave source is generated, is first passed through aforementioned
Optical signal processing method optical signal is handled, then the optical signal that multiplex is obtained is delayed by roll of optical fiber, delay
Optical signal afterwards passes through narrow-band optical filter 2 again and filters, and then inputs photodetector and is reduced into electric signal, which passes through
Electric coupler is inputted after the loss of electric amplifier compensation electro-optic conversion and area of light transmission, one from electric coupler of a part of signal
Output end output is input to electric light phase after being used as microwave and millimeter wave source, another part signal to filter by narrowband electrical filter again
The electrical input of modulator, and then start to recycle next time.
The present invention using electro-optic phase modulator cooperates advanced photon technology to construct the optical-electronic oscillator based on PM-DD,
Electro-optic phase modulator is not necessarily to control circuit in the optical-electronic oscillator based on PM-DD, overcomes Traditional photovoltaic oscillator operation
Point control circuit introduces the problem of additional noise deteriorates the index of mutually making an uproar of oscillator signal.The optical-electronic oscillator is in area of light to letter
It is demodulated again after number being handled, i.e., carries out mutually converting for electric light by the way of " phase-modulation-directly demodulates ", keep away
Exempt from electro-optic intensity modulator operating point in Traditional photovoltaic oscillator and be difficult to stable disadvantage, finally improves optical-electronic oscillator
Long-time stability.
Detailed description of the invention
Fig. 1 is the structural schematic diagram based on PM-DD optical-electronic oscillator in the present invention.
Fig. 2 is the optical signal prosessing schematic illustration based on PM-DD optical-electronic oscillator involved by the present invention.
Fig. 3 is that the involved long-time stability based on PM-DD optical-electronic oscillator and tradition IM-DD optical-electronic oscillator of the present invention are surveyed
Test result comparison diagram.
Specific embodiment
For the ease of the understanding of those skilled in the art, the present invention is made further below with reference to embodiment and attached drawing
Bright, the content that embodiment refers to not is limitation of the invention.
It needs to illustrate in advance, the number such as " 1 ", " 2 " of institute's band is also only in the description of the present invention, after the names of the parts
It is easy for those skilled in the art to distinguish same type of two components when reading the present invention, and should not be understood as referring to
Show or imply relative importance or implicitly indicates the quantity of indicated component.
Present invention is primarily based on following designs: on the basis of Traditional photovoltaic oscillator typical structure, for electro-optic intensity
Modulator operating point is difficult to stable disadvantage, replaces intensity modulator using phase-modulator, comes in conjunction with advanced photon technology real
Existing electrical-optical conversion, overcomes the application drawback of intensity modulator.Specifically, it is carried out after light carrier first being carried out phase-modulation
Narrow-band filtering only retains carrier wave and two single order sidebands, at this point, two single order side band phase differences are 180 degree；Filtered light letter
Number by reaching transmission-type fiber grating after optical circulator, light carrier is with a sideband signals through fiber grating, another side band
It is reflected back, the transmission direction of optical signal is controlled by optical circulator, reflected sideband signals pass through optical phase shifter
Realize 180 degree phase shift；Two ways of optical signals successively passes through fiber delay line, narrow band narrow band light filtering after realizing multiplex by photo-coupler
Device, photodetector, electric amplifier realize the function of delay, secondary filtering, photoelectric conversion and amplification respectively；Amplified telecommunications
Number by electric coupler realize part export, another part enter narrowband electrical filter realize electrical domain filtering after is connected to electric light phase
The electrical input of position modulator, finally constitutes the closed loop of positive feedback.
As shown in Figure 1, a kind of optical-electronic oscillator directly demodulated based on phase-modulation-, comprising: laser, electric light phase
It is modulator, narrow-band optical filter 1, optical circulator, transmission-type fiber grating, optical phase shifter, photo-coupler, fiber delay line, narrow
Band optical filter 2, photodetector, electric amplifier, electric coupler and narrowband electrical filter；
Laser is connected to the light input end of electro-optic phase modulator, and the output end of electro-optic phase modulator connects narrow band light
The input terminal of filter 1, the input terminal of the output end connection optical circulator of narrow-band optical filter 1；
Two output ends of optical circulator are connected with the input terminal of the input terminal of transmission-type fiber grating and optical phase shifter respectively,
The output end of transmission-type fiber grating and the output end of optical phase shifter are connected to two input terminals of photo-coupler；
It is connected between the output end of photo-coupler and the input terminal of narrow-band optical filter 2 by fiber delay line, narrow band light
The output end of filter 2 and the input terminal of photodetector connect, the input of the output end connection electric amplifier of photodetector
End, the output end of electric amplifier reconnect the input terminal of electric coupler；
One output end of electric coupler is as microwave output end, another output end and the narrowband electrical filter of electric coupler
Input terminal is connected, and the output end of narrowband electrical filter reconnects the electrical input of electro-optic phase modulator.
In the above-described embodiments, light carrier transmitted by laser enters electro-optic phase modulator and is modulated by electrical signal phase
Enter narrow-band optical filter afterwards and carry out narrow-band bandpass filtering, only light carrier is allowed to pass through with two symmetrical single order sidebands；After filtering
Optical signal enter optical circulator and reach transmission-type fiber grating, fiber grating only allows light carrier and one of single order sideband
Passing through, another side band is reflected back, and optical phase shifter is reached by another output end and carries out 180 degree phase shift, finally, two-way light letter
Number by photo-coupler synthesis all the way；Optical signal after combining is delayed by roll of optical fiber；Optical signal after delay passes through narrow
After band optical filter filtering, reaches photodetector and be reduced into electric signal；The electric signal compensates electro-optic conversion by electric amplifier
With the loss of area of light transmission, eventually by electric coupler, output is realized in part, and another part passes through narrowband electrical filter most Zhongdao
Up to the electrical input of electro-optic phase modulator, and then start to recycle next time.For certain specific frequency point signals, if it meets
Barkhausen condition (open-loop gain is greater than 1, and phase difference is the integral multiple of 2 π), the signal of the frequency point can be achieved with positive feedback vibration
It swings, generates the oscillator signal of Low phase noise.
Fig. 2 shows the principle handled in above-mentioned optical-electronic oscillator optical signal, optical signal prosessing mode is intended to benefit
Advanced photon technology is combined with electro-optic phase modulator, target optical spectrum is generated, convenient for the direct demodulation of photodetector.The spectrum
It is made of a carrier component and two equiphase single order sidebands.Specifically, its signal flow can be divided into three steps, tool
Body is as follows:
1, phase-modulation:
Light carrier inputs electro-optic phase modulator, and modulated signals carry out phase-modulation, and (light carrier is single-frequency point carrier wave, list
Wavelength channels)；After light carrier is phase-modulated by electrooptic modulator, constituted on frequency domain centered on carrier wave, etc. between
Every frequency spectrum cluster, as shown in Figure 2.In the symmetrical sideband of frequency spectrum cluster two, odd times side band phase is on the contrary, even side band phase is consistent.
2, high-order inhibits:
Modulated optical signal realizes inhibition by narrow band filter 1, to high-order sideband, and after carrying out high-order inhibition, former spectrum is only
Surplus carrier wave and two single order sidebands, the sound intervals such as two sidebands and carrier wave and opposite in phase.
3, phasing back:
Filtered optical signal reaches transmission-type fiber grating, the single order sideband letter of light carrier and the right by optical circulator
Number penetrate fiber grating；The single order sideband on the left side is reflected back, and is exported, is passed through from another output mouth by optical circulator
Optical phase shifter carries out 180 degree phase shift；Finally, two ways of optical signals realizes multiplex by photo-coupler.By above-mentioned optical signal prosessing,
The single order sideband on the left side realizes phasing back, has been finally completed the synthesis of target optical spectrum, i.e., the spectrum is by a carrier component
It is formed with two equiphase single order sidebands.
And then the optical signal for obtaining multiplex is delayed by roll of optical fiber, the optical signal after delay passes through narrowband again
Optical filter 2 filters, and then inputs photodetector and is reduced into electric signal, which compensates electro-optic conversion by electric amplifier
Electric coupler is inputted after loss with area of light transmission, a part of signal is from the output of an output end of electric coupler as microwave milli
Metric wave source, another part signal are input to the electrical input of electro-optic phase modulator again after filtering by narrowband electrical filter, into
And start to recycle next time.
Fig. 3 shows the above-mentioned optical-electronic oscillator based on PM-DD and the long-time stability of tradition IM-DD optical-electronic oscillator are surveyed
Test result comparison diagram.Allan variance described in figure (Allan variance) was proposed by David Allan in 1966, was current state
The inside and outside physical quantity being used uniformly when time domain characterizes high stability oscillator long-time stability.Fig. 3 gives two kinds of inhomogeneities
Type optical-electronic oscillator in 10,100,1000,10000 and the long-time stability of frequency corresponding in 100000s, is not difficult respectively by figure
Find out, Traditional photovoltaic oscillator is totally below using the Allan variance value of optical-electronic oscillator involved by the present invention, illustrates to use
The design of this programme can significantly improve the long-time stability of optical-electronic oscillator；Further, the Allan variance of two oscillators test
In 10 with 100s difference it is little, but 1000,10000 with 100000s in, the present invention involved by optical-electronic oscillator Allan side
Difference reduces nearly an order of magnitude, it follows that the long-time stability of optical-electronic oscillator are significantly improved.
In order to allow those of ordinary skill in the art more easily to understand the improvements of the present invention compared with the existing technology, this
Some attached drawings of invention and description have been simplified, and for the sake of clarity, present specification is omitted some other members
Element, the element that those of ordinary skill in the art should be aware that these are omitted also may make up the contents of the present invention.
Claims (8)
1. the optical-electronic oscillator directly demodulated based on phase-modulation-, comprising: laser, electro-optic phase modulator, narrow band narrow band light filtering
Device 1, optical circulator, transmission-type fiber grating, optical phase shifter, photo-coupler, fiber delay line, narrow-band optical filter 2, photoelectricity are visited
Survey device, electric amplifier, electric coupler and narrowband electrical filter；
The laser is connected to the light input end of electro-optic phase modulator, and the output end connection of the electro-optic phase modulator is narrow
Input terminal with optical filter 1, the input terminal of the output end connection optical circulator of the narrow-band optical filter 1；
Two output ends of the optical circulator are connected with the input terminal of the input terminal of transmission-type fiber grating and optical phase shifter respectively,
The output end of the transmission-type fiber grating and the output end of optical phase shifter are connected to two input terminals of photo-coupler；
It is connected between the output end of the photo-coupler and the input terminal of narrow-band optical filter 2 by fiber delay line, it is described narrow
The input terminal of output end and photodetector with optical filter 2 connects, and the output end connection of the photodetector is electrically amplified
The input terminal of device, the output end of the electric amplifier reconnect the input terminal of electric coupler；
One output end of the electric coupler is as microwave output end, another output end and narrowband electrofiltration wave of the electric coupler
The input terminal of device is connected, and the output end of the narrowband electrical filter reconnects the electrical input of electro-optic phase modulator.
2. a kind of optical signal processing method, comprising the following steps:
1) phase-modulation:
Phase-modulation is carried out to light carrier, after the light carrier passes through phase-modulation, constitutes on frequency domain with carrier component and is
The heart, equally spaced frequency spectrum cluster include two symmetrical sidebands in the frequency spectrum cluster, in two symmetrical sidebands of the frequency spectrum cluster, odd times
Side band phase is on the contrary, even side band phase is consistent.
2) high-order inhibits:
High-order sideband in modulated optical signal is inhibited, carrier component and two single order sidebands in former spectrum are only retained
Optical signal, sound intervals and the opposite in phase such as described two single order sidebands and carrier component.
3) phasing back:
The optical signal that step 2) is obtained is separated into the first optical signal and the second optical signal, and one in described two single order sidebands
Single order sideband and carrier component constitute the first optical signal, another single order sideband in described two single order sidebands constitutes the second light
Signal；
180 degree phase shift is carried out to second optical signal, then it is subjected to multiplex, the letter of light obtained by multiplex with first optical signal
Number spectrum be made of a carrier component and two equiphase single order sidebands.
3. optical signal processing method according to claim 2, it is characterised in that: pass through electric light phase tune in the step 1)
Device processed carries out phase-modulation to light carrier.
4. optical signal processing method according to claim 3, it is characterised in that: pass through narrow band narrow band light filtering in the step 2)
Device 1 inhibits high-order sideband.
5. optical signal processing method according to claim 4, it is characterised in that: in the step 3) by optical circulator and
Transmission-type fiber grating pair optical signal is separated；An output port of the optical signal through optical circulator reaches transmission-type light
Fine grating, the carrier component and a single order sideband are by becoming the first optical signal after transmission-type fiber grating, another one
Rank sideband, which is transmitted type fiber grating and reflects, is output into the second optical signal from the another output mouth of optical circulator again.
6. optical signal processing method according to claim 5, it is characterised in that: pass through optical phase shifter pair in the step 3)
Second optical signal carries out 180 degree phase shift.
7. optical signal processing method according to claim 6, it is characterised in that: pass through photo-coupler pair in the step 3)
Second optical signal and first optical signal carry out multiplex.
8. a kind of method for generating microwave and millimeter wave source, it is characterised in that: first pass through optical signal prosessing side as claimed in claim 7
Method handles optical signal, then the optical signal that multiplex obtains is delayed by roll of optical fiber, and the optical signal after delay leads to again
The filtering of narrow-band optical filter 2 is crossed, photodetector is then inputted and is reduced into electric signal, the electric signal is by electric amplifier compensation electricity
Electric coupler is inputted after light conversion and the loss of area of light transmission, a part of signal exports conduct from an output end of electric coupler
Microwave and millimeter wave source, another part signal are input to the electricity input of electro-optic phase modulator again after filtering by narrowband electrical filter
End, and then start to recycle next time.
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| CN107796422B (en) * | 2017-11-15 | 2020-10-02 | 浙江宝纺印染有限公司 | Optical fiber displacement sensor demodulating equipment |
| CN108521304B (en) * | 2018-03-30 | 2019-11-12 | 华中科技大学 | A kind of super large microwave time delay device |
| CN109186643B (en) * | 2018-06-21 | 2021-10-29 | 上海第二工业大学 | Accurate sensing system and sensing method based on reflection function resonant filter |
| CN110086069A (en) * | 2019-04-17 | 2019-08-02 | 北京遥感设备研究所 | A kind of tunable microwave source and application method based on positive feedback structure |
| CN112683313A (en) * | 2020-12-15 | 2021-04-20 | 南京信息职业技术学院 | Sensor array device of multi-photoelectric oscillator and measuring method |
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| CN104410366B (en) * | 2014-12-15 | 2018-05-04 | 东南大学 | X-band high speed swept-frequency signal generation device and its method based on optical-electronic oscillator |
| CN106025786B (en) * | 2016-07-29 | 2019-01-25 | 北京邮电大学 | A kind of optical-electronic oscillator and its frequency-stabilizing method |
| CN106299977B (en) * | 2016-09-19 | 2019-01-25 | 西安电子科技大学 | The method of two frequency multiplication photoelectric oscillators based on phase-modulation |
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