CN108449143A - A kind of photonic propulsion microwave I/Q down conversion systems - Google Patents
A kind of photonic propulsion microwave I/Q down conversion systems Download PDFInfo
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- CN108449143A CN108449143A CN201810188888.4A CN201810188888A CN108449143A CN 108449143 A CN108449143 A CN 108449143A CN 201810188888 A CN201810188888 A CN 201810188888A CN 108449143 A CN108449143 A CN 108449143A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
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- H04B10/503—Laser transmitters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/501—Structural aspects
- H04B10/503—Laser transmitters
- H04B10/505—Laser transmitters using external modulation
- H04B10/5053—Laser transmitters using external modulation using a parallel, i.e. shunt, combination of modulators
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
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Abstract
The present invention provides a kind of photonic propulsion microwave I/Q down conversion systems, it is related to technical field of optical fiber communication, the system increases modulator using palarization multiplexing double parallel horse and is modulated to radio frequency and local oscillation signal, by adjusting the operating point of modulator, light filters, Polarization Control, the two-way down coversion channel that phase differs 90 degree is constructed, realizes microwave I/Q down coversions.Radio frequency and local oscillation signal of the present invention are modulated to palarization multiplexing optical signal, by carrying out light filtering, optical branching, Polarization Control, balance detection to palarization multiplexing optical signal, realize that the I/Q down coversions of radio frequency and local oscillation signal, the configuration of the present invention is simple have very strong operability；The orthogonal down coversion of two-way is realized by using photonic propulsion method, can avoid the frequency dependence of electronic device, has the advantages that with roomy, the I/Q degrees of balance are high.
Description
Technical field
The present invention relates to technical field of optical fiber communication, especially a kind of microwave I/Q down conversion systems.
Background technology
Microwave I/Q low-converters are the common devices in contemporary electronic systems, are usually used in mirror image and inhibit down coversion, zero intermediate frequency
Reception, phase demodulation, frequency discrimination etc..The essence of microwave I/Q low-converters is the low-converter that a pair of of phase differs 90 degree, by becoming under two
Frequency device and an orthocoupler are constituted.However due to the frequency dependence of electronic device, the conversion efficiency of low-converter is difficult
It is consistent in big bandwidth, microwave I/Q low-converters is caused to face amplitude imbalance problem；Orthocoupler also is difficult to simultaneously
Ensure that phase difference accurately reaches 90 degree in big bandwidth, microwave I/Q low-converters is caused to face phase imbalance problem.
Photon technology has the characteristics that inherent big bandwidth, low frequency rely on, therefore photonic propulsion microwave I/Q down coversions
System is expected to realize the I/Q Amplitude balance and phase balances in big bandwidth.
It has disclosed at present and reports some photonic propulsion microwave I/Q down conversion systems, but these systems are still required for electromigration
The frequency dependences electronic device such as phase device, electric coupler causes the bandwidth of system and the I/Q degrees of balance limited.
Invention content
For overcome the deficiencies in the prior art, the present invention provides a kind of photonic propulsion microwave I/Q down conversion systems, which adopts
Increase modulator (Polarization Division Multiplexing Dual-Parallel with palarization multiplexing double parallel horse
Mach-Zehnder Modulator, PDM-DPMZM) radio frequency and local oscillation signal are modulated, pass through the work of suitable adjustable modulator
Make point, light filtering, Polarization Control, construct the two-way down coversion channel that phase differs 90 degree, realizes microwave I/Q down coversions.
The technical solution adopted by the present invention to solve the technical problems is as follows：
The photonic propulsion microwave I/Q down conversion systems include laser, PDM-DPMZM, optical filter, optical branching device, partially
Shake controller (Polarization Controller, PC), polarization beam apparatus (Polarization Beam Splitter,
PBS) and balance photodetector (Balanced Photodetector, BPD), the optical signal of laser output are input to PDM-
The optical signal input of DPMZM, one end of the light signal output end connection optical filter of PDM-DPMZM, the optical filter other end
The public input terminal of optical branching device is connected, two output ends of optical branching device are sequentially connected PC, PBS and BPD respectively, you can respectively
Obtain the roads I electric signal in the same direction and the orthogonal roads Q electric signal；
The PDM-DPMZM is by a Y type light paths device, two parallel DPMZM, 90 degree of polarization rotators
(Polarization Rotator, PR) and polarization beam combiner (Polarization Beam Combiner, a PBC) group
At two parallel DPMZM are respectively X-DPMZM and Y-DPMZM, include two son modulation in parallel inside wherein X-DPMZM
Device Xa and Xb, Y-DPMZM modulators inside includes two sub- modulator Ya and Yb in parallel, by the output of Y-DPMZM modulators
Signal is carried out 90 degree of polarization rotations, postrotational optical signal and X-DPMZM is polarized through PR by 90 degree of polarization rotator PR of end connection
The optical signal of modulator output inputs PBC jointly, and optical signal exports after PBC merging from PDM-DPMZM modulators；
In the PDM-DPMZM, the prevention at radio-frequency port of radiofrequency signal connexon modulator Xa, laser-correlation frequency signal is adjusted
System, optical signal of the X-DPMZM outputs with radio frequency double-side band；The prevention at radio-frequency port of local oscillation signal connexon modulator Ya, laser pair
Local oscillation signal is modulated, optical signal of the Y-DPMZM outputs with local oscillator double-side band；X-DPMZM outputs have radio frequency bilateral
Optical signal of optical signal and the Y-DPMZM output with local oscillator double-side band of band becomes palarization multiplexing optical signal all the way after PBC,
Into optical filter, which extracts one of upper side band or lower sideband of palarization multiplexing optical signal, then light filters
Device output is the palarization multiplexing optical signal of upper side band or lower sideband, and one of polarization state includes radio-frequency modulations information, is denoted as：
Wherein, A (t), ω1WithIntensity, angular frequency and the phase of radio-frequency modulations information, another polarization state are indicated respectively
Including local oscillator modulation intelligence, is denoted as：
Y (t)=B (t) exp (j ω2t) (2)
Wherein B (t) and ω2The intensity and angular frequency of local oscillator modulation intelligence are indicated respectively；
The palarization multiplexing optical signal of single-side belt is divided into two-way by optical splitter, and Polarization Control is passed sequentially through per road optical signal
Device PC and polarization beam apparatus PBS, the then optical signal that two ports each PBS export can be expressed as：
E1=X (t) cos α+Y (t) sin α exp (j θ) (3)
E2=X (t) cos α-Y (t) sin α exp (j θ) (4)
Wherein α indicates the angle in the optical signal polarization state direction and PBS main shafts of input PBS, θ indicate in optical signal two it is inclined
Shake the phase difference of component；
The two-way light of PBS outputs believes E1And E2Two optical inputs for respectively enteing BPD are balanced detection, obtain telecommunications
It number is represented by：
The polarization state of optical signal is adjusted by PC, the roads Shi Mei input the folder in the optical signal polarization state direction and PBS main shafts of PBS
Angle α is 45 degree, while adjusting the phase difference θ of two polarized components in the optical signal of input PBS, adjusting wherein optical signal all the way
Phase difference θ=0 °, the roads Ze Gai electric current are expressed as：
The signal is the finally obtained roads the I electric signal in the same direction of I/Q down conversion systems of the present invention；
Phase difference θ=90 ° of other optical signal all the way are adjusted again, and the roads Ze Gai electric current is expressed as：
The signal is the finally obtained orthogonal roads the Q electric signal of the I/Q down conversion systems, so far be can be realized under I/Q
Frequency conversion.
The beneficial effects of the present invention are the microwave I/Q down conversion systems using a kind of photonic propulsion, radio frequency and local oscillation signal
It is modulated to palarization multiplexing optical signal, by carrying out light filtering, optical branching, Polarization Control, balance detection to palarization multiplexing optical signal,
Realize that the I/Q down coversions of radio frequency and local oscillation signal, the configuration of the present invention is simple have very strong operability；By using photon
Method realizes the orthogonal down coversion of two-way, can avoid the frequency dependence of electronic device, has with roomy, the I/Q degrees of balance are high
The advantages of.
Description of the drawings
Fig. 1 is the schematic diagram of photonic propulsion microwave I/Q down conversion systems of the present invention.
Fig. 2 is the spectrogram generated in embodiment 1.
Fig. 3 is the in the same direction and orthogonal signal waveforms obtained in embodiment 1.
Fig. 4 is the spectrum obtained in embodiment 2.
Fig. 5 is the in the same direction and orthogonal signal waveforms obtained in embodiment 2.
Specific implementation mode
Present invention will be further explained below with reference to the attached drawings and examples.
The photonic propulsion microwave I/Q down conversion systems include laser, PDM-DPMZM, optical filter, optical branching device, partially
Shake controller (Polarization Controller, PC), polarization beam apparatus (Polarization Beam Splitter,
PBS) and balance photodetector (Balanced Photodetector, BPD), the optical signal of laser output are input to PDM-
The optical signal input of DPMZM, one end of the light signal output end connection optical filter of PDM-DPMZM, the optical filter other end
The public input terminal of optical branching device is connected, two output ends of optical branching device are sequentially connected PC, PBS and BPD respectively, you can respectively
Obtain the roads I electric signal in the same direction and the orthogonal roads Q electric signal；
The PDM-DPMZM is by a Y type light paths device, two parallel DPMZM, 90 degree of polarization rotators
(Polarization Rotator, PR) and polarization beam combiner (Polarization Beam Combiner, a PBC) group
At two parallel DPMZM are respectively X-DPMZM and Y-DPMZM, include two son modulation in parallel inside wherein X-DPMZM
Device Xa and Xb, Y-DPMZM modulators inside includes two sub- modulator Ya and Yb in parallel, by the output of Y-DPMZM modulators
Signal is carried out 90 degree of polarization rotations, postrotational optical signal and X-DPMZM is polarized through PR by 90 degree of polarization rotator PR of end connection
The optical signal of modulator output inputs PBC jointly, and optical signal exports after PBC merging from PDM-DPMZM modulators；
In the PDM-DPMZM, the prevention at radio-frequency port of radiofrequency signal connexon modulator Xa, laser-correlation frequency signal is adjusted
System, optical signal of the X-DPMZM outputs with radio frequency double-side band；The prevention at radio-frequency port of local oscillation signal connexon modulator Ya, laser pair
Local oscillation signal is modulated, optical signal of the Y-DPMZM outputs with local oscillator double-side band；X-DPMZM outputs have radio frequency bilateral
Optical signal of optical signal and the Y-DPMZM output with local oscillator double-side band of band becomes palarization multiplexing optical signal all the way after PBC,
Into optical filter, which is band logical or band rejection type, which extracts the upper side band of palarization multiplexing optical signal
Or one of lower sideband, then optical filter output is the palarization multiplexing optical signal of upper side band or lower sideband, one of them is partially
Polarization state includes radio-frequency modulations information, is denoted as：
Wherein, A (t), ω1WithIntensity, angular frequency and the phase of radio-frequency modulations information, another polarization state are indicated respectively
Including local oscillator modulation intelligence, is denoted as：
Y (t)=B (t) exp (j ω2t) (2)
Wherein B (t) and ω2The intensity and angular frequency of local oscillator modulation intelligence are indicated respectively；
The palarization multiplexing optical signal of single-side belt is divided into two-way by optical splitter, and Polarization Control is passed sequentially through per road optical signal
Device PC and polarization beam apparatus PBS, the then optical signal that two ports each PBS export can be expressed as：
E1=X (t) cos α+Y (t) sin α exp (j θ) (3)
E2=X (t) cos α-Y (t) sin α exp (j θ) (4)
Wherein α indicates the angle in the optical signal polarization state direction and PBS main shafts of input PBS, θ indicate in optical signal two it is inclined
Shake the phase difference of component；
The two-way light of PBS outputs believes E1And E2Two optical inputs for respectively enteing BPD are balanced detection, obtain telecommunications
It number is represented by：
The polarization state of optical signal is adjusted by PC, the roads Shi Mei input the folder in the optical signal polarization state direction and PBS main shafts of PBS
Angle α is 45 degree, while adjusting the phase difference θ of two polarized components in the optical signal of input PBS, adjusting wherein optical signal all the way
Phase difference θ=0 °, the roads Ze Gai electric current are expressed as：
The signal is the finally obtained roads the I electric signal in the same direction of I/Q down conversion systems of the present invention；
Phase difference θ=90 ° of other optical signal all the way are adjusted again, and the roads Ze Gai electric current is expressed as：
The signal is the finally obtained orthogonal roads the Q electric signal of the I/Q down conversion systems, so far be can be realized under I/Q
Frequency conversion.
As shown in Figure 1, the photonic propulsion microwave I/Q down conversion systems include laser, PDM-DPMZM, optical filter, light
Splitter, Polarization Controller PC, polarization beam apparatus PBS and balance photodetector BPD, the optical signal of laser output are input to
The optical signal input of PDM-DPMZM, one end of the light signal output end connection optical filter of PDM-DPMZM, optical filter are another
One end connects the public input terminal of optical branching device, and two output ends of optical branching device are sequentially connected PC, PBS and BPD respectively；
Embodiment includes：Laser, PDM-DPMZM, optical filter, optical branching device, PC, PBS, BPD, radiofrequency signal
Source, local oscillation signal source, direct voltage source, spectrometer, oscillograph.The delivery outlet of lasing light emitter passes through polarization maintaining optical fibre PDM-DPMZM's
Optical input is connected, and one end of the light signal output end connection optical filter of PDM-DPMZM, the optical filter other end connects light point
Two output ends of the public input terminal of road device, optical branching device are separately connected PC, PBS and BPD, the modulation of radio-frequency signal source connexon
The prevention at radio-frequency port of device Xa, the prevention at radio-frequency port of local oscillation signal source connexon modulator Ya, direct voltage source connect the straight of PDM-DPMZM
Flow port；
Embodiment 1：It is 1552.3nm, luminous power 17dBm to select the optical maser wavelength that laser generates；Radio-frequency signal source produces
The radiofrequency signal of raw frequency 26GHz, power 0dBm；Local oscillation signal source generates the local oscillation signal of frequency 25.9GHz, power 10dBm；
The half-wave voltage of PDM-DPMZM is 3.5V, bandwidth 30GHz, extinction ratio 30dB；The centre wavelength 1552.6nm, 3dB of optical filter
Bandwidth 0.6nm；The 3dB responsive bandwidths of BPD are 1GHz, responsiveness 1.1A/W；
The passband curve for testing optical filter, is shown in Fig. 2；
Direct voltage source output voltage is adjusted, so that sub- modulator Xa, Xb, Ya, Yb is operated in smallest point, at this time input light
The optical signal of filter includes mainly that ± 1 rank sideband, carrier wave and the repressed optical signal of even order sideband, spectrum are shown in Fig. 2；
The spectrum of test light filter output signal, is shown in Fig. 2, it is seen that -1 rank sideband is inhibited after optical filter；
Wherein all the way PC is adjusted, the axial of two output ends of two polarized components and PBS of optical signal is made to differ 45 degree, and
Two 0 degree of polarized component phase differences, road BPD export the difference frequency signal in the same direction of radio frequency and local oscillation signal, frequency 100MHz, period
10ns, waveform are shown in Fig. 3；
Another way PC is adjusted, the axial direction of two output ends of two polarized components and PBS of optical signal is made to differ 45 degree, and two
90 degree of a polarized component phase difference, road BPD export radio frequency difference frequency signal orthogonal with local oscillation signal, frequency 100MHz, period
10ns, phase differ 90 degree with the difference frequency signal in the same direction that the first via generates, and waveform is shown in Fig. 3.
Embodiment 2：It is 1552.3nm, luminous power 17dBm to select the optical maser wavelength that laser generates；Radio-frequency signal source produces
The radiofrequency signal of raw frequency 36GHz, power 0dBm；Local oscillation signal source generates the local oscillator letter of frequency 17.95GHz, power 18dBm
Number；The half-wave voltage of PDM-DPMZM is 3.5V, bandwidth 30GHz, extinction ratio 30dB；The centre wavelength 1552.6nm of optical filter,
Three dB bandwidth 0.6nm；The 3dB responsive bandwidths of BPD are 1GHz, responsiveness 1.1A/W；
The passband curve for testing optical filter, is shown in Fig. 4；
Direct voltage source output voltage is adjusted, so that sub- modulator Xa, Xb is operated in smallest point, Ya is operated in maximum point, Y-
DPMZM is operated in smallest point, adjusts the light carrier that the operating points Yb make Y-DPMZM export and is suppressed；Optical filter is inputted at this time
Optical signal includes mainly that ± 1 rank sideband of radio-frequency modulations and ± 2 rank sidebands of local oscillator modulation, other components are suppressed, spectrum
See Fig. 4；
The spectrum of test light filter output signal, negative side band are suppressed, -1 rank sideband and the local oscillator modulation of radio-frequency modulations
- 2 rank sidebands be suppressed, in remaining optical signal mainly include radio-frequency modulations+1 rank sideband and local oscillator modulation+2 rank sides
Band is shown in Fig. 4；
First via PC is adjusted, the axial direction of two output ends of two polarized components and PBS of optical signal is made to differ 45 degree, and two
0 degree of a polarized component phase difference, road BPD export the difference frequency signal in the same direction of radio frequency and local oscillation signal, frequency 100MHz, period
10ns, waveform are shown in Fig. 5；
The second road PC is adjusted, the axial direction of two output ends of two polarized components and PBS of optical signal is made to differ 45 degree, and two
90 degree of a polarized component phase difference, road BPD export radio frequency difference frequency signal orthogonal with local oscillation signal, frequency 100MHz, period
10ns, phase differ 90 degree with the difference frequency signal in the same direction that the first via generates, and waveform is shown in Fig. 5.
To sum up, a kind of microwave I/Q down conversion systems of photonic propulsion of the present invention, it is simple in structure, there is very strong operability；
The present invention realizes the orthogonal down coversion of two-way by using optical means, can avoid the frequency dependence of electronic device, has band
Advantage roomy, the I/Q degrees of balance are high.
Claims (1)
1. a kind of photonic propulsion microwave I/Q down conversion systems, it is characterised in that：
The photonic propulsion microwave I/Q down conversion systems include laser, PDM-DPMZM, optical filter, optical branching device, polarization control
The optical signal of device, polarization beam apparatus and balance photodetector processed, laser output is input to the optical signal input of PDM-DPMZM
End, one end of the light signal output end connection optical filter of PDM-DPMZM, the optical filter other end connect the public of optical branching device
Two output ends of input terminal, optical branching device are sequentially connected PC, PBS and BPD respectively, you can respectively obtain the roads I telecommunications in the same direction
Number and the orthogonal roads Q electric signal；
The PDM-DPMZM is by a Y type light paths device, two parallel DPMZM, 90 degree of polarization rotators
(Polarization Rotator, PR) and polarization beam combiner composition, two parallel DPMZM be respectively X-DPMZM and
Include two sub- modulator Xa and Xb in parallel inside Y-DPMZM, wherein X-DPMZM, includes two inside Y-DPMZM modulators
Sub- modulator Ya and Yb in parallel, 90 degree of polarization rotator PR are connected by the output end of Y-DPMZM modulators, and signal is carried out 90
Degree polarization rotation, the optical signal that postrotational optical signal and the output of X-DPMZM modulators are polarized through PR input PBC, light letter jointly
Number PBC merging after from PDM-DPMZM modulators export；
In the PDM-DPMZM, the prevention at radio-frequency port of radiofrequency signal connexon modulator Xa, laser-correlation frequency signal is modulated,
Optical signal of the X-DPMZM outputs with radio frequency double-side band；The prevention at radio-frequency port of local oscillation signal connexon modulator Ya, laser is to local oscillator
Signal is modulated, optical signal of the Y-DPMZM outputs with local oscillator double-side band；
Optical signal warp of the optical signal and Y-DPMZM outputs with radio frequency double-side band with local oscillator double-side band of X-DPMZM outputs
Become palarization multiplexing optical signal all the way after crossing PBC, into optical filter, which extracts the top of palarization multiplexing optical signal
One of band or lower sideband, then optical filter output is the palarization multiplexing optical signal of upper side band or lower sideband, one of them
Polarization state includes radio-frequency modulations information, is denoted as：
Wherein, A (t), ω1WithIndicate that intensity, angular frequency and the phase of radio-frequency modulations information, another polarization state include respectively
Local oscillator modulation intelligence, is denoted as：
Y (t)=B (t) exp (j ω2t) (2)
Wherein B (t) and ω2The intensity and angular frequency of local oscillator modulation intelligence are indicated respectively；
The palarization multiplexing optical signal of single-side belt is divided into two-way by optical splitter, and Polarization Controller PC is passed sequentially through per road optical signal
With polarization beam apparatus PBS, then the optical signal that two ports each PBS export can be expressed as：
E1=X (t) cos α+Y (t) sin α exp (j θ) (3)
E2=X (t) cos α-Y (t) sin α exp (j θ) (4)
Wherein α indicates that the angle in the optical signal polarization state direction and PBS main shafts of input PBS, θ indicate two polarizations point in optical signal
The phase difference of amount；
The two-way light of PBS outputs believes E1And E2Two optical inputs for respectively enteing BPD are balanced detection, and obtaining electric signal can
It is expressed as：
The polarization state of optical signal is adjusted by PC, the roads Shi Mei input the angle α in the optical signal polarization state direction and PBS main shafts of PBS
It is 45 degree, while adjusts the phase difference θ of two polarized components in the optical signal of input PBS, adjusts the wherein phase of optical signal all the way
Potential difference θ=0 °, the roads Ze Gai electric current are expressed as：
The signal is the finally obtained roads the I electric signal in the same direction of I/Q down conversion systems of the present invention；
Phase difference θ=90 ° of other optical signal all the way are adjusted again, and the roads Ze Gai electric current is expressed as：
The signal is the finally obtained orthogonal roads the Q electric signal of the I/Q down conversion systems, and I/Q down coversions so far can be realized.
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