CN108667517A - A kind of microwave photon mixing method and system based on local oscillator frequency multiplication - Google Patents
A kind of microwave photon mixing method and system based on local oscillator frequency multiplication Download PDFInfo
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Abstract
A kind of microwave photon mixing method and system based on local oscillator frequency multiplication, belong to optic communication and Microwave photonics field.The present invention utilizes dual-polarization double parallel MZ Mach-Zehnder, and the microwave photon mixing system of local oscillator frequency multiplication is formed in conjunction with devices such as laser, preposition Polarization Controller, 90 ° of couplers of microwave, postposition Polarization Controller, optical fiber polarizer, tunable optical bandpass filter, erbium-doped fiber amplifier, photodetectors.This system is using 2 rank local oscillator sidebands and 1 rank radio frequency sideband beat frequency, it can be achieved that the Frequency mixing processing based on local oscillator frequency multiplication, on the one hand reduces frequency needs of the mixing system to local oscillation signal, on the other hand, due to using single sideband modulation pattern, can effectively reduce spurious signal.In addition, the frequency mixing method can realize the switching of Up/Down Conversion by changing a DC offset voltage, it can be used for time division emission and the reception of radio frequency.
Description
Technical field
The present invention proposes a kind of microwave photon mixing method and system based on local oscillator frequency multiplication, and this method and system belong to
Optic communication and Microwave photonics field.
Background technology
Traditional microwave communication can in any direction on emit, be easy to build and reconstruct, but be limited to coaxial cable
Transmission performance so that microwave communication has the deficiencies of bandwidth is small, loss is high, serious by electromagnetic interference, bulky.And optical fiber is logical
Letter has many advantages, such as that low-loss, electromagnetism interference, super large bandwidth preferably resolve the above problem.Microwave photonics are as one
Emerging cross discipline, optical fiber technology and microwave communication are combined together, and form novel communication link.Microwave light subchain
Road increases electrical/optical and optical electrical conversion, the microwave signal of input is modulated to area of light, and carry out signal processing.In conjunction with microwave without
The advantages of seam covering and the big bandwidth of optical fiber, long distance transmission, the link have roomy transmission belt, strong antijamming capability, transmission damage
Consume low advantage.Further, since light frequency is significantly larger than rf frequency, make microwave photon link that there is good signal isolation
Degree, avoids signals leakiness, so that it is had in the remote transmission etc. of processing wide-band microwave signal and signal significantly excellent
Gesture.
Increasingly increase with the application such as wireless communication, satellite communication and radar detection to bandwidth requirements, promotes microwave
Communication gradually develops to high band.In order to make full use of the frequency spectrum resource of high band, need in radiofrequency signal to turn in transmitting terminal
High frequency radio signals are changed to emit, are received in receiving terminal by being converted under high frequency radio signals.Traditional microwave photon
Frequency mixing method is directly to be mixed 1 rank radio frequency sideband with 1 rank local oscillator sideband in area of light.However, making with higher frequency range
With needing the radiofrequency signal for launching higher frequency in transmitting terminal, that is, need with the local oscillation signal of higher frequency to radiofrequency signal
Carry out conversion.At the same time, detecting to the radiofrequency signal of higher frequency is needed in receiving terminal, therefore generally required more
High-frequency local oscillation signal carries out lower conversion to realize subsequent processing to high frequency radio signals.
Invention content
To solve the above-mentioned problems, the present invention provides a kind of microwave photon mixing method and system based on local oscillator frequency multiplication.
A kind of microwave photon mixing system based on local oscillator frequency multiplication, by laser, preposition Polarization Controller, dual-polarization double flat
Row Mach-Zehnder modulators, 90 ° of couplers of microwave, postposition Polarization Controller, optical fiber polarizer, adjustable optical bandpass filtering
Device, erbium-doped fiber amplifier, photodetector composition, wherein the dual-polarization double parallel Mach-Zehnder modulators include the
One double parallel Mach-Zehnder modulators and the second double parallel Mach-Zehnder modulators, two double parallel Mach-Zehnders
There are three DC offset voltage input port DC1, DC2, DC3 and DC4, DC5, DC6 respectively for modulator, and the first double parallel Mach-was once
The output signal of Dare modulator, and the second double parallel Mach-Zehnder modulators after 90 ° of polarization rotators are defeated
Go out signal and be connected to polarized light beam combining device, polarized light beam combining device is used as dual-polarization after coupling two mutually perpendicular polarization state signals
The output signal of double parallel Mach-Zehnder modulators；The laser sends out the continuous light carrier of light wave frequency range, light carrier warp
It is directed at the dual-polarization double parallel Mach-Zehnder modulation after crossing the polarization direction of the preposition Polarization Controller adjustment light carrier
The slow axis of device is incident, and is divided into two-way and respectively enters two double parallel Mach-Zehnder modulators；Radiofrequency signal RF inputs is micro-
Intensity is equal, phase differs 90 ° of two-way radiofrequency signal to obtain for 90 ° of couplers of wave, this two-way radiofrequency signal is inputted respectively
Into two sub- Mach-Zehnder modulators of the first double parallel Mach-Zehnder modulators, by the two-way radiofrequency signal tune
It makes on light carrier；Local oscillation signal LO is passed through into a sub- Mach-Zehnder in the second double parallel Mach-Zehnder modulators
In modulators modulate to light carrier；The output signal of the dual-polarization double parallel Mach-Zehnder modulators is connected to the postposition
Polarization Controller, and projected to the mutually perpendicular optical signal of polarization state on one polarization direction by the optical fiber polarizer,
And by the tunable optical bandpass filter after, using the erbium-doped fiber amplifier to filtered signal carry out power put
Greatly, finally opto-electronic conversion is carried out with the photodetector.
The method of microwave photon mixing is obtained using a kind of microwave photon mixing system based on local oscillator frequency multiplication such as
Under：
1) half-wave voltage of up-conversion pattern, the dual-polarization double parallel Mach-Zehnder modulators is 3.5V, 3dB bands
Width is 23GHz；It is that 16.1V, DC2 are to adjust the DC offset voltage DC1 in the first double parallel Mach-Zehnder modulators
13.5V, DC3 21.5V, to realize that the carrier-suppressed SSB of pair+1 rank radio frequency sideband is modulated；Adjust the second double parallel Mach-
DC offset voltage DC4 in Zeng Deer modulators is 12.2V, DC5 12.8V, DC6 1.8V, is believed 2 rank local oscillators with realizing
The Double Sideband Suppressed Carrier modulation of number sideband；The tunable optical bandpass filter only retains -2 rank local oscillator sidebands and+1 rank radio frequency
Sideband；The erbium-doped fiber amplifier is set as APC patterns, and it is 1.6dBm to make Output optical power perseverance；The photodetector is adopted
It is 50GHz with bandwidth, responsiveness is the photodetector of 0.65A/W；
2) half-wave voltage of down coversion pattern, the dual-polarization double parallel Mach-Zehnder modulators is 3.5V, 3dB bands
Width is 23GHz；It is that 16.1V, DC2 are to adjust the DC offset voltage DC1 in the first double parallel Mach-Zehnder modulators
13.5V, DC3 14.8V, to realize that the carrier-suppressed SSB of p- 1 rank radio frequency sideband is modulated；Adjust the second double parallel Mach-
DC offset voltage DC4 in Zeng Deer modulators is 12.2V, DC5 12.8V, DC6 1.8V, is believed 2 rank local oscillators with realizing
The Double Sideband Suppressed Carrier modulation of number sideband；The tunable optical bandpass filter only retains -2 rank local oscillator sidebands and -1 rank radio frequency
Sideband；The erbium-doped fiber amplifier is set as APC patterns, and it is 1.6dBm to make Output optical power perseverance；The photodetector is adopted
It is 50GHz with bandwidth, responsiveness is the photodetector of 0.65A/W.
Optimization design link structure of the present invention, using 2 rank local oscillator sidebands and 1 rank radio frequency sideband beat frequency, it can be achieved that based on this
On the one hand the Frequency mixing processing for frequency multiplication of shaking reduces frequency needs of the mixing system to local oscillation signal, on the other hand, due to using single
Sideband modulation pattern can effectively reduce spurious signal.In addition, the frequency mixing method can be realized by changing a DC offset voltage
The switching of Up/Down Conversion can be used for transmitting and the reception system of timesharing radio frequency.
Description of the drawings
Fig. 1 is to be filtered using dual-polarization double parallel Mach-Zehnder modulators, 90 ° of couplers of microwave and adjustable optical band logical
Wave device realizes the link structure schematic diagram of the microwave photon mixing system based on local oscillator frequency multiplication.
Fig. 2 is the spectrum diagram at s1, s2, s3, s4 in Fig. 1, wherein (a) is up-conversion pattern, it is (b) down coversion mould
Formula.
In figure, 1, laser, 2, Polarization Controller, 3,90 ° of couplers of microwave, 4, double parallel Mach-Zehnder modulators,
4-1, the first double parallel Mach-Zehnder modulators, 4-2, the second double parallel Mach-Zehnder modulators, 4-3,90 ° of polarization rotations
Turn device, 4-4, polarized light beam combining device, 5, postposition Polarization Controller, 6, optical fiber polarizer, 7, tunable optical bandpass filter, 8, mix
Doped fiber amplifier, 9, photodetector.
Specific implementation mode
With reference to embodiment and attached drawing and mathematical derivation, the present invention will be further described.
The system structure of the microwave photon mixing method based on local oscillator frequency multiplication of the present embodiment is as shown in Figure 1.
It is the continuous of 1550.09nm that laser, which uses distributed feedback laser 1 (RIO, ORION), output center frequency,
Light carrier, power 17.6dBm, line width 500kHz.Light carrier is by entering dual-polarization double flat after preposition Polarization Controller 2
Row Mach-Zehnder modulators 4 (Fujitsu, FTM7977HQA), preposition Polarization Controller 2 are used to adjust the polarization of light carrier
Direction makes it be directed at the slow axis of dual-polarization double parallel Mach-Zehnder modulators 4 to realize maximum power output.Dual-polarization is double
Parallel Mach-Zehnder modulators are by the first double parallel Mach-Zehnder modulators 4-1, the second double parallel Mach-Zehnder tune
Device 4-2 processed, 90 ° of polarization rotator 4-3, a polarized light beam combining device 4-4 composition, two double parallel Mach-Zehnder tune
Device processed respectively corresponds to three DC offset voltages (DC1, DC2, DC3 and DC4, DC5, DC6).Radiofrequency signal is first inputted into microwave
Intensity is equal, phase differs 90 ° of two-way radiofrequency signal to obtain for 90 ° of couplers 3, then passes through the first double parallel Mach-Zehnder
Your modulator 4-1 adjusts corresponding DC offset voltage DC1 to 16.1V by two-way rf-signal modulation to light carrier,
DC2 to 13.5V and DC3 to 21.5V realizes the carrier-suppressed SSB modulation of pair+1 rank radiofrequency signal, spectrum such as Fig. 2 (a)
In (s1) shown in.It will by a sub- Mach-Zehnder modulators in the second double parallel Mach-Zehnder modulators 4-2
Local oscillation signal is modulated on light carrier, and adjusts corresponding DC offset voltage DC4 to 12.2V, and DC5 to 12.8V and DC6 are extremely
Shown in (s2) in 1.8V, Double Sideband Suppressed Carrier modulation of the realization to 2 rank local oscillation signals, spectrum such as Fig. 2 (a).90 ° of polarizations
Circulator 4-3 and polarized light beam combining device 4-4 to by the output optical signal of two double parallel Mach-Zehnder modulators with mutual
Vertical polarization state coupling output.Later, using postposition Polarization Controller 5 and optical fiber polarizer 6 that polarization state is mutually perpendicular
Optical signal projects on a polarization direction, and filters out+2 rank local oscillator sidebands and remaining nothing using tunable optical bandpass filter 7
Shown in (s3) in high-order sideband, and retain -2 rank local oscillator sidebands and+1 rank radio frequency sideband, spectrogram such as Fig. 2 (a).Make
Power amplification is carried out to filtered optical signal with erbium-doped fiber amplifier 8, finally carries out opto-electronic conversion with photodetector 9,
Up-conversion signal is obtained, shown in (s4) in electric spectrogram such as Fig. 2 (a).By the way that DC3 is adjusted to 14.8V from 21.5V, can incite somebody to action+
1 rank radio frequency sideband is switched to -1 rank radio frequency sideband, finally allows itself and -2 rank local oscillator sideband beat frequencies, is believed with obtaining corresponding down coversion
Number.Spectrum and electricity spectrum when down coversion is as shown in Fig. 2 (b).This system is used to believe by two frequency multiplication local oscillation signals and radio frequency as a result,
Number beat frequency, can obtain mixed frequency signal, and can be carried out between Up/Down Conversion pattern by changing a DC offset voltage
Switching.
When light carrier centre wavelength is 1550.09nm, power 17.6dBm, radio frequency signal frequency 14GHz, power is
10dBm, local oscillation signal frequency are that 10GHz under up-conversion pattern, uses tunable optical bandpass filter when power is 19dBm
Retain+1 rank radio frequency sideband and -2 rank local oscillator sidebands ,+2 rank local oscillator sidebands and the useless optical signal of remaining high-order have all been suppressed to bottom
Under making an uproar.Later, power amplification is carried out to optical signal using erbium-doped fiber amplifier (Golight, C-M-C-P-FA), for mending
Repay the insertion loss that dual-polarization double parallel Mach-Zehnder modulators and tunable optical bandpass filter introduce.Finally use band
Width is 50GHz, right+1 rank radio frequency sideband of photodetector (Finisar, XPDV2120R) and -2 ranks that responsiveness is 0.65A/W
Local oscillator sideband carries out beat frequency, obtains corresponding up-conversion signal.Down-conversion signal can similarly be obtained.
The present invention is based on the principle of the microwave photon mixing method of local oscillator frequency multiplication is as follows,
Step 1：
Laser output continuous light carrier be
In formula, P0For the power of light carrier, ω0For the angular frequency of light carrier.The expression formula V of radio frequency and local oscillation signalRF(t)
And VLO(t) it is respectively
VRF(t)=VRFcosωRFt (2)
VLO(t)=VLOcosωLOt (3)
In formula, VRFAnd VLOThe respectively voltage amplitude of radio frequency and local oscillation signal, ωRFAnd ωLORespectively radio frequency and local oscillator letter
Number angular frequency.It is divided into two-way by equicohesive after light carrier input dual-polarization double parallel Mach-Zehnder modulators, and divides
It Jin Ru not a sub- double parallel Mach-Zehnder modulators.Radiofrequency signal inputs 90 ° of couplers of microwave, exports two-way intensity phase
90 ° of radiofrequency signal signal is differed Deng, phase, and modulates two sons of first double parallel Mach-Zehnder modulators respectively
Mach-Zehnder modulators.Local oscillation signal is only inputted into a sub- horse in second double parallel Mach-Zehnder modulators
Conspicuous-Zeng Deer modulators.Then the output light field of two double parallel Mach-Zehnder modulators is respectively
In formula, LDPMZMFor the insertion loss of double parallel Mach-Zehnder modulators, mRF=π VRF/ V π and mLO=π VLO/Vπ
The respectively modulation depth of radio frequency and local oscillation signal, V π are the half-wave voltage of modulator.θ1=π VDC1/Vπ、θ2=π VDC2/Vπ、θ4
=π VDC4/ V π and θ5=π VDC5/ V π are respectively the light phase caused by the DC offset voltage of four sub- Mach-Zehnder modulators
It moves, VDC1、VDC2、VDC4And VDC5The DC offset voltage that respectively four sub- Mach-Zehnder modulators are loaded.θ3=π
VDC3/ V π and θ6=π VDC6/ V π are respectively the light phase shift caused by the DC offset voltage of two main Mach-Zehnder modulators,
VDC3And VDC6The DC offset voltage that respectively two main Mach-Zehnder modulators are loaded.
In order to realize the carrier-suppressed SSB modulation of pair+1 rank radiofrequency signal, first double parallel Mach-Zehnder is allowed
Two sub- Mach-Zehnder modulators in modulator are operated in minimum transfer point, i.e. θ1=θ2=π, main Mach-Zehnder tune
Device processed is operated in quadrature bias point, i.e. θ3=pi/2.Then the output light field of first double parallel Mach-Zehnder modulators is
Above formula is unfolded using Jacobi's-An Geer identities, then first double parallel Mach-Zehnder modulators
Output light field be
In formula, only considers 1 rank radio frequency sideband, ignore high-order sideband, and Jn() is n rank Bessel function of the first kind.
At the same time, in order to utilize the optics second order sideband of local oscillation signal, its sub- Mach-Zehnder modulators modulated is allowed to be operated in most
Big transfer point, the DC offset voltage of another sub- Mach-Zehnder modulators are used for adjusting the light intensity of the road light carrier, make it
With another way by the modulated light carrier intensity of local oscillation signal equal, i.e. θ5=2arccosJ0(mLO).Adjust main Mach-Zehnder
The DC offset voltage of your modulator allows the opposite in phase of two sub- Mach-Zehnder modulators output optical signals, i.e. θ6=2 π.
Then the output light field of second double parallel Mach-Zehnder modulators is
Above formula is unfolded using Jacobi's-An Geer identities, then second double parallel Mach-Zehnder modulators
Output light field be
In formula, only considers 2 rank local oscillator sidebands, ignore high-order sideband.Due to dual-polarization double parallel Mach-Zehnder modulators
Built-in 90 ° of polarization rotators (90 ° of polarization rotator, 90 ° of PR) are located at second double parallel Mach-Zehnder
After modulator, the polarization state for outputting it optical signal has rotated 90 °, then the output light letter of two Mach-Zehnder modulators
Number polarization state it is orthogonal.It is mutual to polarization state by polarization beam combiner (Polarization beam combiner, PBC) again
Perpendicular optical signal carries out coupling output, then the output light field of dual-polarization double parallel Mach-Zehnder modulators is
Step 2：
After dual-polarization double parallel Mach-Zehnder modulators, by the way that Polarization Controller and optical fiber polarizer are cascaded,
It is 45 ° that the angle of two ways of optical signals and optical fiber polarizer, which can be allowed, to allow the mutually perpendicular optical signal of two-way polarization state to throw
On shadow a to polarization direction.Then the output light field of the polarizer is
Step 3：
+ 2 rank local oscillator sidebands and other high-order sidebands are filtered with tunable optical bandpass filter again, retain -2 rank local oscillator sides
Band and+1 rank radio frequency sideband.Then the output light field of tunable optical bandpass filter is
In formula, LOBPFFor the introduced insertion loss of tunable optical bandpass filter.
Step 4：
Power amplification is carried out to optical signal using erbium-doped fiber amplifier, to overcome dual-polarization double parallel Mach-Zehnder
Insertion loss caused by modulator and tunable optical bandpass filter.Then the output light field of erbium-doped fiber amplifier is
Step 5：
Optical signal after power amplification is inputted into photodetector, carries out opto-electronic conversion.The electric signal then obtained is
It is ω that we, which can obtain frequency, as a result,RF+2ωLOUp-conversion signal.Next, we analyze down coversion feelings
Condition.Work as θ3When=- pi/2, first double parallel Mach-Zehnder modulators export -1 rank radio frequency sideband, then by filtered light
Signal carries out power amplification, then amplified optical signal is
It is inputted photodetector again, carries out opto-electronic conversion.Then the expression formula of corresponding photoelectric current is
It is ω that we, which can obtain frequency, as a result,RF-2ωLODown-conversion signal.
In conclusion we have proposed a kind of microwave photon mixing link based on local oscillator frequency multiplication, which may be implemented
Frequency upooaversion to radiofrequency signal or lower conversion.
Claims (2)
1. a kind of microwave photon mixing system based on local oscillator frequency multiplication, by laser, preposition Polarization Controller, dual-polarization double parallel
Mach-Zehnder modulators, 90 ° of couplers of microwave, postposition Polarization Controller, optical fiber polarizer, tunable optical bandpass filter,
Erbium-doped fiber amplifier, photodetector composition, wherein the dual-polarization double parallel Mach-Zehnder modulators include first
Double parallel Mach-Zehnder modulators and the second double parallel Mach-Zehnder modulators, two double parallel Mach-Zehnder tune
There are three DC offset voltage input port DC1, DC2, DC3 and DC4, DC5, DC6, the first double parallel Mach-Zehnders respectively for device processed
The output signal of your modulator, and the second double parallel Mach-Zehnder modulators after 90 ° of polarization rotators output
Signal is connected to polarized light beam combining device, and polarized light beam combining device is double as dual-polarization after coupling two mutually perpendicular polarization state signals
The output signal of parallel Mach-Zehnder modulators；It is characterized in that：The continuous light that the laser sends out light wave frequency range carries
Wave, light carrier are directed at the dual-polarization double parallel horse after the preposition Polarization Controller adjusts the polarization direction of light carrier
The slow axis of conspicuous-Zeng Deer modulators is incident, and is divided into two-way and respectively enters two double parallel Mach-Zehnder modulators；It will penetrate
Intensity is equal, phase differs 90 ° of two-way radiofrequency signal to obtain for frequency signal RF input 90 ° of couplers of microwave, this two-way is penetrated
Frequency signal is separately input in two sub- Mach-Zehnder modulators of the first double parallel Mach-Zehnder modulators, will be described
On two-way rf-signal modulation to light carrier；Local oscillation signal LO is passed through into one in the second double parallel Mach-Zehnder modulators
A sub- Mach-Zehnder modulators are modulated on light carrier；The output of the dual-polarization double parallel Mach-Zehnder modulators is believed
Number it is connected to the postposition Polarization Controller, and the mutually perpendicular optical signal of polarization state is projected to one by the optical fiber polarizer
On a polarization direction, and by the tunable optical bandpass filter after, using the erbium-doped fiber amplifier to filtered
Signal carries out power amplification, finally carries out opto-electronic conversion with the photodetector.
2. obtaining microwave photon mixing using a kind of microwave photon mixing system based on local oscillator frequency multiplication described in claim 1
Method, it is characterised in that：
1) half-wave voltage of up-conversion pattern, the dual-polarization double parallel Mach-Zehnder modulators is 3.5V, and three dB bandwidth is
23GHz；Adjust the DC offset voltage DC1 in the first double parallel Mach-Zehnder modulators be 16.1V, DC2 13.5V,
DC3 is 21.5V, to realize that the carrier-suppressed SSB of pair+1 rank radio frequency sideband is modulated；Adjust the second double parallel Mach-Zehnder
DC offset voltage DC4 in modulator is 12.2V, DC5 12.8V, DC6 1.8V, to realize to 2 rank local oscillation signal sidebands
Double Sideband Suppressed Carrier modulation；The tunable optical bandpass filter only retains -2 rank local oscillator sidebands and+1 rank radio frequency sideband；
The erbium-doped fiber amplifier is set as APC patterns, and it is 1.6dBm to make Output optical power perseverance；The photodetector uses bandwidth
For 50GHz, responsiveness is the photodetector of 0.65A/W；
2) half-wave voltage of down coversion pattern, the dual-polarization double parallel Mach-Zehnder modulators is 3.5V, and three dB bandwidth is
23GHz；Adjust the DC offset voltage DC1 in the first double parallel Mach-Zehnder modulators be 16.1V, DC2 13.5V,
DC3 is 14.8V, to realize that the carrier-suppressed SSB of p- 1 rank radio frequency sideband is modulated；Adjust the second double parallel Mach-Zehnder
DC offset voltage DC4 in modulator is 12.2V, DC5 12.8V, DC6 1.8V, to realize to 2 rank local oscillation signal sidebands
Double Sideband Suppressed Carrier modulation；The tunable optical bandpass filter only retains -2 rank local oscillator sidebands and -1 rank radio frequency sideband；
The erbium-doped fiber amplifier is set as APC patterns, and it is 1.6dBm to make Output optical power perseverance；The photodetector uses bandwidth
For 50GHz, responsiveness is the photodetector of 0.65A/W.
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