CN102508387B - Light quantizer based on four-wave mixing effect - Google Patents
Light quantizer based on four-wave mixing effect Download PDFInfo
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- CN102508387B CN102508387B CN 201110351958 CN201110351958A CN102508387B CN 102508387 B CN102508387 B CN 102508387B CN 201110351958 CN201110351958 CN 201110351958 CN 201110351958 A CN201110351958 A CN 201110351958A CN 102508387 B CN102508387 B CN 102508387B
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Abstract
The invention discloses a high-speed light quantizer based on a four-wave mixing effect. The light quantizer comprises a first optical pumping source, a second optical pumping source and a sampling light source, wherein the output end of a high-speed microwave electric signal source is connected with the input end of the sampling light source; the input ends of a first optical amplifier, a secondoptical amplifier and a third optical amplifier are respectively connected with the output ends of the first optical pumping source, the second optical pumping source and the sampling light source; the input end of a strength modulator is connected with the output end of the third optical amplifier; the output end of a microwave signal source to be tested is connected with the input end of the strength modulator; the input ends of a first polarization controller, a second polarization controller and a third polarization controller are respectively connected with the output ends of the first optical amplifier, the second optical amplifier and the third optical amplifier; the input end of a first waveguide array grating is connected with the output ends of the first polarization controller,the second polarization controller and the third polarization controller respectively; the input end of a nonlinear medium is connected with the output end of the first waveguide array grating; the input end of a second waveguide array grating is connected with the output end of the nonlinear medium; and the input end of a parallel high-speed optical detection array is connected with the output end of the second waveguide array grating.
Description
Technical field
The present invention relates to the Microwave photonics field, say more specifically for analog-to-digital optical quantizer.
Background technology
At a high speed, the high precision quantizer has a wide range of applications in fields such as high-speed communication, Real-Time Monitoring, Radar Signal Processing, image processing and space communtications, is the requisite core devices of field of information processing.Along with the high speed development of infotech in recent years, although the quantizer of traditional dependence electronics technology has certain development, owing to being subject to the restriction of electron mobility, met with electronic bottleneck, limited the further raising of its performance, be difficult to satisfy the demands.And the quantizer of based superconductive material requires the working environment of low temperature, has limited its range of application.The more traditional electricity quantizer of optical quantizer has and has that resolution is high, sampling rate is fast, stability is high, anti-electromagnetic interference (EMI) etc. a bit, received much attention in recent years.A lot of optical quantizer structures have been proposed in recent years, for example: adopt zero dispersive optical fiber and abnormal dispersion fiber to realizing light quantization, utilize non-equilibrium Mach-Zehnder modulators and filter array etc.The invention provides a kind of optical quantizer based on four-wave mixing effect.
Summary of the invention
The object of the invention is to, a kind of high-speed light quantizer based on four-wave mixing effect is provided, it is based on four-wave mixing effect and realizes a kind of optical quantizer for high speed, high precision analogue conversion.
For achieving the above object, the invention provides a kind of high-speed light quantizer based on four-wave mixing effect, comprising:
One first optical pumping source, one second optical pumping source and a sampling light source;
One high-speed microwave electric signal source, the output terminal of this high-speed microwave electric signal source is connected with the input end of sampling light source, is used for sampled signal is added on the sampling light source;
One first image intensifer, one second image intensifer and one the 3rd image intensifer, its input end are connected with the first optical pumping source, the second optical pumping source and the output terminal of the light source of being connected respectively;
One intensity modulator, the input end of this intensity modulator is connected with the output terminal of the 3rd image intensifer;
One microwave signal source to be measured, the output terminal of this microwave signal source to be measured is connected with the input end of intensity modulator;
One first Polarization Controller, one second Polarization Controller and one the 3rd Polarization Controller, its input end are connected output terminal with the first image intensifer, the second image intensifer respectively and are connected with intensity modulator, be used for controlling respectively the transmission polarized state of light;
One first wave guide array grating, the input end of this first wave guide array grating are connected with the first Polarization Controller, the second Polarization Controller and the output terminal of the 3rd Polarization Controller respectively;
One nonlinear medium, the input end of this nonlinear medium is connected with the output terminal of first wave guide array grating;
One second waveguide array grating, the input end of this second waveguide array grating is connected with the output terminal of nonlinear medium;
One parallel high-speed light detection array, the input end of this parallel high-speed photo detector array is connected with the output terminal of the second waveguide array grating.
The light source of wherein sampling is the high speed mode-locked laser, based on the high-speed pulse laser instrument of gain switch or based on the high-speed sampling pulse generating device that laser instrument-intensity modulator-phase-modulator-dispersive medium series winding forms, its band is wider than the twice of the bandwidth of microwave signal source to be measured.
Wherein the first image intensifer, the second image intensifer and the 3rd image intensifer are Erbium-Doped Fiber Amplifier (EDFA) or semiconductor optical amplifier.
Wherein intensity modulator is the Mach-Zehnder intensity modulator of a High Extinction Ratio, and its bandwidth is not less than the bandwidth of microwave signal source to be measured.
Wherein the bandwidth of microwave signal source to be measured institute launched microwave signal is not more than half of sampling light source bandwidth.
Wherein model and the parameter of first wave guide array grating and the second waveguide array grating are in full accord.
Wherein non-line medium is dispersion shifted optical fiber, highly nonlinear optical fiber, nonlinear crystal or the semiconductor optical amplifier that is in state of saturation.
Wherein the parallel high-speed photodetector array is integrated device or discrete device, and the bandwidth of its single detector unit is not less than the bandwidth of sampling light source.
The invention has the beneficial effects as follows: this optical quantizer is high except the resolution with general optical quantizer, sampling rate is fast and stable advantages of higher, have also that controllability is strong, linearity advantages of higher.
Description of drawings
For further specifying technology contents of the present invention, the invention will be further described below in conjunction with accompanying drawing, wherein:
Fig. 1 be the present invention " based on four-wave mixing effect optical quantizer " structured flowchart.
Fig. 2 is the output spectrum schematic diagram after the four-wave mixing.
Fig. 3 is with the Changing Pattern of microwave power to be measured and quantification schematic diagram through each ideler frequency luminous power after the four-wave mixing.
Embodiment
As shown in Figure 1, the invention provides a kind of high-speed light quantizer based on four-wave mixing effect, comprising:
One first optical pumping source 1, one second optical pumping source 2 and a sampling light source 3, described sampling light source 3 is high speed mode-locked lasers, based on the high-speed pulse laser instrument of gain switch or based on the high-speed sampling pulse generating device that laser instrument-intensity modulator-phase-modulator-dispersive medium series winding forms, its band is wider than the twice of microwave signal source 9 bandwidth to be measured;
One high-speed microwave electric signal source 4, the output terminal of this high-speed microwave electric signal source 4 is connected with the input end of sampling light source 3, is used for sampled signal is added on the sampling light source 3;
One first image intensifer 5, one second image intensifer 6 and one the 3rd image intensifer 7, its input end is connected with the first optical pumping source 1, the second optical pumping source 2 and the output terminal of the light source 3 of being connected respectively, described the first image intensifer 5, the second image intensifer 6 and the 3rd image intensifer 7 are Erbium-Doped Fiber Amplifier (EDFA) or semiconductor optical amplifier, all require to reach more than the 10dBm through the optical output power after the first image intensifer 5, the second image intensifer 6 and the 3rd image intensifer 7, in order to satisfy the energy requirement of four-wave mixing process;
One intensity modulator 8, the input end of this intensity modulator 8 is connected with the output terminal of the 3rd image intensifer 7, the Mach-Zehnder intensity modulator that described intensity modulator 8 is High Extinction Ratios, its bandwidth is not less than the bandwidth of microwave signal source 9 to be measured;
One microwave signal source 9 to be measured, the output terminal of this microwave signal source 9 to be measured is connected with the input end of intensity modulator 8, the bandwidth of 9 launched microwave signals of described microwave signal source to be measured is not more than half of sampling light source 3 bandwidth, microwave signal source 9 to be measured has been loaded into microwave signal to be measured through on the sampling light wave after the image intensifer 7 through intensity modulator 8, and required signal transmission is provided;
One first Polarization Controller 10, one second Polarization Controller 11 and one the 3rd Polarization Controller 12, its input end is connected with the output terminal that the first image intensifer 5, the second image intensifer 6 are connected with intensity modulator respectively, be used for controlling respectively the transmission polarized state of light, because the four-wave mixing process is relevant with polarisation of light, thereby thereby can by adjusting the efficient of polarisation of light attitude control four-wave mixing, reach prominent ideler frequency light output;
One first wave guide array grating 13, the input end of this first wave guide array grating 13 is connected with the output terminal of the first Polarization Controller 10, the second Polarization Controller 11 and the 3rd Polarization Controller 12 respectively, makes the light of respectively exporting of the first Polarization Controller 10, the second Polarization Controller 11 and the 3rd Polarization Controller 12 be mixed into an optical fiber output;
One nonlinear medium 14, the input end of this nonlinear medium 14 is connected with the output terminal of first wave guide array grating 13, described nonlinear medium 14 is dispersion shifted optical fiber, highly nonlinear optical fiber, nonlinear crystal or the semiconductor optical amplifier that is in state of saturation, in order to provide four-wave mixing required interaction medium, pump light and the flashlight exported from first wave guide array grating 13 output terminals occur to enter the second waveguide array grating 15 after the four-wave mixings through nonlinear medium 14.The first pump light and the second pumping light wavelength are respectively λ
1And λ
2, flashlight is λ
s, then pass through after the nonlinear medium 14, at the output terminal generation λ of the second waveguide array grating 15
I1=1/ (1/ λ
2+ 1/ λ
s-1/ λ
1), λ
I2=1/ (1/ λ
1+ 1/ λ
s-1/ λ
2), λ
I3=1/ (1/ λ
1+ 1/ λ
2-1/ λ
s), λ
I4=1/ (2/ λ
2-1/ λ
s) etc. ideler frequency light.The spectrum schematic diagram as shown in Figure 2, in the situation that pump light remains unchanged, polarization state is consistent, each ideler frequency light intensity is relevant with the wavelength difference between signal light intensity and the flashlight.When microwave signal to be measured caused the microwave carrier signals optical power change, each ideler frequency luminous power with the variation of signal power as shown in Figure 3.Choose a power points P
ThAs judgement power.When power is higher than P
ThThen be designated as " 1 ", be lower than P
ThThen be designated as " 0 ".Therefore, when signal power less than P1 the time, λ
I1, λ
I2, λ
I3And λ
I4Power all is lower than judgement power, and it is encoded to (0000).When signal power is between P1-P2, λ
I4Power is higher than judgement power, and λ
I1, λ
I2And λ
I3All be lower than judgement power, therefore be encoded to (1000).Identical therewith, signal power is at P2-P3, P3-P4, and during greater than P4, respectively corresponding (1100), (1110), (1111);
One second waveguide array grating 15, the input end of this second waveguide array grating 15 is connected with the output terminal of nonlinear medium 14, receives through each ideler frequency light after the four-wave mixing, in order to respectively output;
Wherein model and the parameter of first wave guide array grating 13 and the second waveguide array grating 15 are in full accord;
One parallel high-speed light detection array 16, the input end of this parallel high-speed photo detector array 16 is connected with the output terminal of the second waveguide array grating 15, described parallel high-speed photodetector array 16 is integrated device or discrete device, and the bandwidth of its single detector unit is not less than the bandwidth of sampling light source 3.
The course of work
See also Fig. 1, the course of work of the present invention is:
Enter first wave guide array grating 13 after keeping polarizations stable through the first Polarization Controller 10 and the second Polarization Controller 11 more respectively after the pump light that the first optical pumping source 1 and the second optical pumping source 2 send amplifies through the first image intensifer 5 and the second image intensifer 6 respectively; And the sampled light signal that sends of sampling light source 3 is amplified into (modulation signal is the microwave signal to be measured in the microwave signal source 9 to be measured) after intensity modulator 8 modulation through the 3rd image intensifer 7, also enters first wave guide array grating 13 after the 3rd Polarization Controller 12 keeps polarizations stable.After first wave guide array grating 13, four-wave mixing occurs and produces each ideler frequency light in pump light and flashlight in nonlinear medium 14, and each ideler frequency light enters respectively parallel high-speed photo detector array 16 by the second waveguide array grating 15 afterwards.In the situation that pump light remains unchanged, polarization state is consistent, each ideler frequency light intensity is relevant with the wavelength difference between signal light intensity and the flashlight.When microwave signal to be measured caused the microwave carrier signals optical power change, each ideler frequency luminous power changed with the variation of microwave signal power to be measured, and through over-sampling and quantification, judgement and coding, microwave signal to be measured is finished the conversion of analog to digital.
Above-described specific embodiment; purpose of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the above only is specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. high-speed light quantizer based on four-wave mixing effect comprises:
One first optical pumping source, one second optical pumping source and a sampling light source;
One high-speed microwave electric signal source, the output terminal of this high-speed microwave electric signal source is connected with the input end of sampling light source, is used for sampled signal is added on the sampling light source;
One first image intensifer, one second image intensifer and one the 3rd image intensifer, its input end are connected with the first optical pumping source, the second optical pumping source and the output terminal of the light source of being connected respectively;
One intensity modulator, the input end of this intensity modulator is connected with the output terminal of the 3rd image intensifer;
One microwave signal source to be measured, the output terminal of this microwave signal source to be measured is connected with the input end of intensity modulator;
One first Polarization Controller, one second Polarization Controller and one the 3rd Polarization Controller, its input end are connected output terminal with the first image intensifer, the second image intensifer respectively and are connected with intensity modulator, be used for controlling respectively the transmission polarized state of light;
One first wave guide array grating, the input end of this first wave guide array grating are connected with the first Polarization Controller, the second Polarization Controller and the output terminal of the 3rd Polarization Controller respectively;
One nonlinear medium, the input end of this nonlinear medium is connected with the output terminal of first wave guide array grating;
One second waveguide array grating, the input end of this second waveguide array grating is connected with the output terminal of nonlinear medium;
One parallel high-speed light detection array, the input end of this parallel high-speed photo detector array is connected with the output terminal of the second waveguide array grating.
2. the optical quantizer based on four-wave mixing effect according to claim 1, the light source of wherein sampling is the high speed mode-locked laser, based on the high-speed pulse laser instrument of gain switch or based on the high-speed sampling pulse generating device that laser instrument-intensity modulator-phase-modulator-dispersive medium series winding forms, its band is wider than the twice of the bandwidth of microwave signal source to be measured.
3. the optical quantizer based on four-wave mixing effect according to claim 1, wherein the first image intensifer, the second image intensifer and the 3rd image intensifer are Erbium-Doped Fiber Amplifier (EDFA) or semiconductor optical amplifier.
4. the optical quantizer based on four-wave mixing effect according to claim 1, wherein intensity modulator is the Mach-Zehnder intensity modulator of a High Extinction Ratio, its bandwidth is not less than the bandwidth of microwave signal source to be measured.
5. the optical quantizer based on four-wave mixing effect according to claim 1, wherein the bandwidth of microwave signal source to be measured institute launched microwave signal is not more than half of sampling light source bandwidth.
6. the optical quantizer based on four-wave mixing effect according to claim 1, wherein model and the parameter of first wave guide array grating and the second waveguide array grating are in full accord.
7. the optical quantizer based on four-wave mixing effect according to claim 1, wherein nonlinear medium is dispersion shifted optical fiber, highly nonlinear optical fiber, nonlinear crystal or the semiconductor optical amplifier that is in state of saturation.
8. the optical quantizer based on four-wave mixing effect according to claim 1, wherein the parallel high-speed photo detector array is integrated device or discrete device, the bandwidth of its single probe unit is not less than the bandwidth of sampling light source.
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|---|---|---|---|---|
| CN101794952A (en) * | 2010-01-27 | 2010-08-04 | 中国科学院半导体研究所 | Accurately-tunable optical fiber laser microwave source with low phase noise and narrow line width |
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| CN101794952A (en) * | 2010-01-27 | 2010-08-04 | 中国科学院半导体研究所 | Accurately-tunable optical fiber laser microwave source with low phase noise and narrow line width |
Non-Patent Citations (2)
| Title |
|---|
| 《Photonic integrated technology for multi-wavelength laser emission》;Chen XiangFei,Liu Wen,An JunMing,et.al;《Chinese Science Bulletin》;20111031;第56卷;3064-3071 * |
| Chen XiangFei,Liu Wen,An JunMing,et.al.《Photonic integrated technology for multi-wavelength laser emission》.《Chinese Science Bulletin》.2011,第56卷3064-3071. |
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