CN107123919A - 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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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, it is described that 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 arrowband electrical filter are included based on the optical-electronic oscillator that phase-modulation is directly demodulated.Electro-optic phase modulator need not control circuit in the optical-electronic oscillator, overcome Traditional photovoltaic oscillator operation point control circuit and introduce additional noise so that the problem of index of mutually making an uproar of oscillator signal deteriorates, it is demodulated again after area of light is handled signal, the mutual conversion of electric light is carried out by the way of " phase-modulation is directly demodulated ", avoid electro-optic intensity modulator operating point in Traditional photovoltaic oscillator and be difficult to stable shortcoming, 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, more particularly to a kind of optical signal processing method and base
In the optical-electronic oscillator for phase-modulation-directly demodulate.
Background technology
Overstable oscillation device is the core of electronic communication system.High-quality microwave oscillator optic communication, satellite communication,
The direction such as microwave communication and high-acruracy survey plays an important role.Optical-electronic oscillator（Opto-electronic
Oscillator, OEO）Pole Low phase noise can be produced based on unique advantage such as fiber delay line low-loss, big bandwidth and not with shaking
Swing the rise of frequency and increase, be overstable microwave, millimeter wave oscillation source high-quality it is alternative.Shaken as a kind of typical feedback-type
Device is swung, the general principle of optical-electronic oscillator is：The continuous light that laser is sent is oscillated signal intensity 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, then is passed through
Frequency-selecting, amplification, finally feed back to modulator electrical input, are then circulated next time, meet Barkhausen oscillation condition（Open
Ring gain is more than 1, differs as 2 π integral multiple）Frequency ultimately form stable oscillator signal.
Traditional photovoltaic oscillator typically coordinates photodetector using electro-optic intensity modulator, based on " intensity modulated-directly
Demodulation "（Intensity Modulation-Direct Demodulation, IM-DD）Mode（Modulated using electro-optic intensity
Device carries out intensity modulated to light carrier, is directly demodulated after delay, i.e., so-called IM-DD modes）Come realize electrical/optical and light/
, there is following defect in the mutual conversion of electricity：On the one hand, the operating point of electro-optic intensity modulator is difficult stabilization, 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.
The content of the invention
The technical problem to be solved in the present invention is to provide it is a kind of based on phase-modulation-optical-electronic oscillator that directly demodulates, lead to
Cross electro-optic phase modulator and replace intensity modulator, and be demodulated again after area of light is handled signal, i.e., using PM-DD
Mode carry out the mutual conversion of electric light, so as to overcome the shortcomings of conventional art.Further, equally based on phase-modulation-
The technical thought directly demodulated, the present invention also provides a kind of optical signal processing method and generation high stability microwave and millimeter wave source
Method.
In order to solve the above-mentioned technical problem, the present invention is adopted the following technical scheme that：One kind is based on phase-modulation-directly demodulation
Optical-electronic oscillator, including：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 arrowband 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 with optical filter 1, the output end of the narrow-band optical filter 1 connects the input of optical circulator；
The input connection of two output ends of the optical circulator respectively with the input and optical phase shifter of transmission-type fiber grating,
The output end of the transmission-type fiber grating and the output end of optical phase shifter are connected to two inputs of photo-coupler；
Connected between the output end of the photo-coupler and the input of narrow-band optical filter 2 by fiber delay line, it is described narrow
The input connection of output end and photodetector with optical filter 2, the output end connection of the photodetector is electrically amplified
The input of device, the output end of the electric amplifier reconnects the input of electric coupler；
One output end of the electric coupler is used as microwave output end, another output end and the arrowband electrofiltration ripple of the electric coupler
The input of device is connected, and the output end of the arrowband 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 comprises the following steps：
1）Phase-modulation：
Phase-modulation is carried out to light carrier, after the light carrier is by phase-modulation, constituted on frequency domain using carrier component in
The heart, equally spaced frequency spectrum cluster, the frequency spectrum cluster include two symmetrical sidebands, in two symmetrical sidebands of the frequency spectrum cluster, odd
Side band phase is on the contrary, even side band phase is consistent.
2）High-order suppresses：
High-order sideband in modulated optical signal is suppressed, obtains only retaining carrier component and two single order sidebands in former spectrum
Optical signal, sound interval and the opposite in phase such as described two single order sidebands and carrier component.
3）Phasing back：
By step 2）Obtained optical signal is separated into one in the first optical signal and the second optical signal, described two single order sidebands
Another single order sideband that single order sideband is constituted with carrier component in the first optical signal, described two single order sidebands constitutes the second light
Signal；
180 degree phase shift is carried out to second optical signal, then itself and first optical signal are subjected to multiplex, light letter obtained by multiplex
Number spectrum be made up of a carrier component with two equiphase single order sidebands.
Wherein, the step 1）In by electro-optic phase modulator to light carrier carry out phase-modulation.
Wherein, the step 2）In high-order sideband is suppressed by narrow-band optical filter 1.
Wherein, the step 3）In separated 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
Turn into the first optical signal after transmission-type fiber grating, another single order sideband is transmitted type fiber grating and reflected again from the ring of light
Another output port of shape device is output into the second optical signal.
Further, the step 3）In by optical phase shifter to the second optical signal carry out 180 degree phase shift.
Further, the step 3）In the first optical signal is closed with first optical signal by photo-coupler
Ripple.
As another aspect of the present invention, a kind of method in generation high stability microwave and millimeter wave source, it first passes through foregoing
Optical signal processing method optical signal is handled, then the optical signal that multiplex is obtained enters line delay by roll of optical fiber, delay
Optical signal afterwards is filtered by narrow-band optical filter 2 again, is then inputted photodetector and is reduced into electric signal, the electric signal passes through
Electric amplifier compensates and electric coupler is inputted after the loss that electro-optic conversion and area of light are transmitted, one from electric coupler of a part of signal
Output end output is inputted to electric light phase again as micron Millimeter-Wave Source, another part signal after being filtered by arrowband electrical filter
The electrical input of modulator, and then start to circulate next time.
The present invention coordinates advanced photon technology to build the optical-electronic oscillator based on PM-DD using electro-optic phase modulator,
Electro-optic phase modulator need not control circuit in the optical-electronic oscillator based on PM-DD, overcome Traditional photovoltaic oscillator operation
Point control circuit introduces additional noise and causes the problem of index of mutually making an uproar of oscillator signal deteriorates.The optical-electronic oscillator is in area of light to letter
It is demodulated again after number being handled, i.e., the mutual conversion of electric light is carried out by the way of " phase-modulation-directly demodulation ", is kept away
Exempt from electro-optic intensity modulator operating point in Traditional photovoltaic oscillator and be difficult to stable shortcoming, finally improve optical-electronic oscillator
Long-time stability.
Brief description of the drawings
Fig. 1 is the structural representation based on PM-DD optical-electronic oscillators in the present invention.
Fig. 2 is the optical signal prosessing principle schematic based on PM-DD optical-electronic oscillators involved by the present invention.
Fig. 3 is that the involved long-time stability based on PM-DD optical-electronic oscillators and tradition IM-DD optical-electronic oscillators of the present invention are surveyed
Test result comparison diagram.
Embodiment
For the ease of the understanding of those skilled in the art, the present invention is made further with reference to embodiment and accompanying drawing
It is bright, the content that embodiment is referred to not limitation of the invention.
Need to illustrate in advance, the numeral such as " 1 ", " 2 " of institute's band is also only in the description of the invention, after each component names
Those skilled in the art are easy for make a distinction same type of two parts when reading the present invention, and it is not intended that referring to
Show or imply relative importance or the implicit quantity for indicating indicated part.
Present invention is primarily based on following design：On the basis of Traditional photovoltaic oscillator typical structure, for electro-optic intensity
Modulator operating point is difficult to stable shortcoming, replaces intensity modulator using phase-modulator, comes real with reference to advanced photon technology
Existing electrical-optical conversion, overcomes the application drawback of intensity modulator.Specifically, light carrier is first subjected to progress after phase-modulation
Narrow-band filtering, only retains carrier wave and two single order sidebands, now, and two single order side band phase differences are 180 degree；Filtered light letter
Number by after optical circulator reach transmission-type fiber grating, light carrier and a sideband signals pass through fiber grating, another side band
It is reflected back, the transmission direction of optical signal is controlled by optical circulator, the sideband signals reflected passes through optical phase shifter
Realize 180 degree phase shift；Two ways of optical signals is realized by photo-coupler sequentially passes through fiber delay line, narrow band narrow band light filtering after multiplex
Device, photodetector, electric amplifier realize delay, secondary filtering, opto-electronic conversion and the function of amplification respectively；Telecommunications after amplification
Number by electric coupler realize part export, another part enter arrowband electrical filter realize electrical domain filter after be connected to electric light phase
The electrical input of position modulator, finally constitutes the closed circuit of positive feedback.
As shown in Figure 1, it is a kind of based on phase-modulation-optical-electronic oscillator that directly demodulates, including：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 arrowband electrical filter；
Laser is connected to the light input end of electro-optic phase modulator, the output end connection narrow band narrow band light filtering of electro-optic phase modulator
The input of device 1, the output end of narrow-band optical filter 1 connects the input of optical circulator；
The input connection of two output ends of optical circulator respectively with the input and optical phase shifter of transmission-type fiber grating, transmission
The output end of type fiber grating and the output end of optical phase shifter are connected to two inputs of photo-coupler；
Connected between the output end of photo-coupler and the input of narrow-band optical filter 2 by fiber delay line, narrow band narrow band light filtering
The output end of device 2 and the input of photodetector are connected, and the output end of photodetector connects the input of electric amplifier, electricity
The output end of amplifier reconnects the input of electric coupler；
One output end of electric coupler is used as microwave output end, another output end of electric coupler and the input of arrowband electrical filter
End is connected, and the output end of arrowband electrical filter reconnects the electrical input of electro-optic phase modulator.
In the above-described embodiments, the light carrier transmitted by laser is modulated into electro-optic phase modulator by electrical signal phase
Enter narrow-band optical filter afterwards and carry out narrow-band bandpass filtering, only allow light carrier 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
Pass through, another side band is reflected back, reaching optical phase shifter by another output end carries out 180 degree phase shift, finally, two-way light letter
Number by photo-coupler synthesis all the way；Optical signal after combining enters line delay by roll of optical fiber；Optical signal after delay passes through narrow
After band optical filter filtering, reach photodetector and be reduced into electric signal；The electric signal compensates electro-optic conversion by electric amplifier
The loss transmitted with area of light, eventually through electric coupler, output is realized in part, and another part passes through arrowband electrical filter most Zhongdao
Up to the electrical input of electro-optic phase modulator, and then start to circulate next time.For some specific frequency signals, if it meets
Barkhausen condition（Open-loop gain is more than 1, and phase difference is 2 π integral multiple）, the signal of the frequency can be achieved with positive feedback and shakes
Swing, produce the oscillator signal of Low phase noise.
Fig. 2 shows the principle handled in above-mentioned optical-electronic oscillator optical signal, and optical signal prosessing mode is intended to profit
Advanced photon technology is combined with electro-optic phase modulator, target optical spectrum is produced, is easy to the direct demodulation of photodetector.The spectrum
It is made up of a carrier component with two equiphase single order sidebands.Specifically, its signal flow can be divided into three steps, tool
Body is as follows：
1st, phase-modulation:
Light carrier inputs electro-optic phase modulator, and modulated signals carry out phase-modulation（Light carrier is single-frequency point carrier wave, Single wavelength
Optical signal）；After light carrier is phase-modulated by electrooptic modulator, constituted on frequency domain centered on carrier wave, it is equally spaced
Frequency spectrum cluster, as shown in Figure 2.In the symmetrical sideband of frequency spectrum cluster two, odd side band phase is on the contrary, even side band phase is consistent.
2nd, high-order suppresses:Modulated optical signal is realized to high-order sideband and suppressed by narrow band filter 1, carries out high-order suppression
Afterwards, former spectrum only remains carrier wave and two single order sidebands, sound interval and the opposite in phase such as two sidebands and carrier wave.
3rd, phasing back:Filtered optical signal reaches transmission-type fiber grating, light carrier and the right by optical circulator
Single order sideband signals pass through fiber grating；The single order sideband on the left side is reflected back, and is exported by optical circulator from another
Port is exported, and 180 degree phase shift is carried out by optical phase shifter；Finally, two ways of optical signals realizes multiplex by photo-coupler.By upper
State 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 by
One carrier component and two equiphase single order sidebands are constituted.
Afterwards, then by multiplex the optical signal obtained enters line delay by roll of optical fiber, and the optical signal after delay passes through arrowband again
Optical filter 2 is filtered, and is then inputted photodetector and is reduced into electric signal, the electric signal compensates electro-optic conversion by electric amplifier
Electric coupler is inputted after the loss transmitted with area of light, a part of signal is used as micron milli from the output end output of electric coupler
Metric wave source, another part signal is inputted to the electrical input of electro-optic phase modulator again after being filtered by arrowband electrical filter, is entered
And start to circulate next time.Fig. 3 shows the length of the above-mentioned optical-electronic oscillator based on PM-DD and tradition IM-DD optical-electronic oscillators
Phase stability test comparative result figure.Allan variances described in figure（Allan variance）Proposed by David Allan in 1966
, it is the current physical quantity being used uniformly both at home and abroad when time domain characterizes high stability oscillator long-time stability.Fig. 3 gives
Two kinds of different type optical-electronic oscillators are respectively in the steady in a long-term of 10,100,1000,10000 frequencies corresponding with 100000s
Property, it is not difficult to find out by figure, Traditional photovoltaic oscillator is totally below using the Allan variance value of optical-electronic oscillator involved by the present invention,
Illustrate that using the design of this programme the long-time stability of optical-electronic oscillator can be significantly improved；Further, two oscillators are tested
Allan variance in 10 with 100s difference less, but in 1000,10000 with 100000s, the involved optoelectronic oscillation of the present invention
The Allan variance value of device reduces nearly an order of magnitude, it follows that the long-time stability of optical-electronic oscillator have been obtained significantly
Improve.
In order to allow those of ordinary skill in the art more easily to understand improvements of the present invention relative to prior art, this
Some accompanying drawings of invention and description have been simplified, and for the sake of clarity, present specification is omitted some other members
Element, those of ordinary skill in the art should be aware that these elements omitted also may make up present disclosure.
Claims (8)
1. based on phase-modulation-optical-electronic oscillator that directly demodulates, including：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 arrowband 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 with optical filter 1, the output end of the narrow-band optical filter 1 connects the input of optical circulator；
The input connection of two output ends of the optical circulator respectively with the input and optical phase shifter of transmission-type fiber grating,
The output end of the transmission-type fiber grating and the output end of optical phase shifter are connected to two inputs of photo-coupler；
Connected between the output end of the photo-coupler and the input of narrow-band optical filter 2 by fiber delay line, it is described narrow
The input connection of output end and photodetector with optical filter 2, the output end connection of the photodetector is electrically amplified
The input of device, the output end of the electric amplifier reconnects the input of electric coupler；
One output end of the electric coupler is used as microwave output end, another output end and the arrowband electrofiltration ripple of the electric coupler
The input of device is connected, and the output end of the arrowband electrical filter reconnects the electrical input of electro-optic phase modulator.
2. a kind of optical signal processing method, comprises the following steps：
1）Phase-modulation：
Phase-modulation is carried out to light carrier, after the light carrier is by phase-modulation, constituted on frequency domain using carrier component in
The heart, equally spaced frequency spectrum cluster, the frequency spectrum cluster include two symmetrical sidebands, in two symmetrical sidebands of the frequency spectrum cluster, odd
Side band phase is on the contrary, even side band phase is consistent；
2）High-order suppresses：
High-order sideband in modulated optical signal is suppressed, obtains only retaining carrier component and two single order sidebands in former spectrum
Optical signal, sound interval and the opposite in phase such as described two single order sidebands and carrier component；
3）Phasing back：
By step 2）Obtained optical signal is separated into one in the first optical signal and the second optical signal, described two single order sidebands
Another single order sideband that single order sideband is constituted with carrier component in the first optical signal, described two single order sidebands constitutes the second light
Signal；
180 degree phase shift is carried out to second optical signal, then itself and first optical signal are subjected to multiplex, light letter obtained by multiplex
Number spectrum be made up of a carrier component with two equiphase single order sidebands.
3. optical signal processing method according to claim 2, it is characterised in that：The step 1）In adjusted by electric light phase
Device processed carries out phase-modulation to light carrier.
4. optical signal processing method according to claim 3, it is characterised in that：The step 2）In pass through narrow band narrow band light filtering
Device 1 suppresses to high-order sideband.
5. optical signal processing method according to claim 4, it is characterised in that：The step 3）In 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 turning into the first optical signal after transmission-type fiber grating, another one
Rank sideband is transmitted type fiber grating and reflected is output into the second optical signal from another output port of optical circulator again.
6. optical signal processing method according to claim 5, it is characterised in that：The step 3）In pass through optical phase shifter pair
Second optical signal carries out 180 degree phase shift.
7. optical signal processing method according to claim 6, it is characterised in that：The step 3）In pass through photo-coupler pair
First optical signal carries out multiplex with first optical signal.
8. a kind of method for producing high stability microwave and millimeter wave source, it is characterised in that：First pass through the light letter described in claim 7
Number processing method is handled optical signal, then the optical signal that multiplex is obtained enters line delay by roll of optical fiber, the light after delay
Signal is filtered by narrow-band optical filter 2 again, is then inputted photodetector and is reduced into electric signal, the electric signal is by electrically amplified
Device inputs electric coupler, an output end of a part of signal from electric coupler after compensating the loss that electro-optic conversion is transmitted with area of light
Output is inputted to electro-optic phase modulator again as micron Millimeter-Wave Source, another part signal after being filtered by arrowband electrical filter
Electrical input, and then start circulate next time.
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| 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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