CN208079086U - Quadruple optics triangle generator based on external modulation - Google Patents
Quadruple optics triangle generator based on external modulation Download PDFInfo
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- CN208079086U CN208079086U CN201820011648.2U CN201820011648U CN208079086U CN 208079086 U CN208079086 U CN 208079086U CN 201820011648 U CN201820011648 U CN 201820011648U CN 208079086 U CN208079086 U CN 208079086U
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Abstract
Quadruple optics triangle generator based on external modulation,It is related to opto-electronic device,Microwave photonics,All-optical data process field,Continuous-wave laser (1) connects double parallel MZ Mach-Zehnder (2) first,Sine wave local oscillator (3) connects 0 degree of electric bridge (4),Wherein electric signal connects phase-shifter (5) and power amplifier (6) all the way,Power amplifier (6) connects 90 degree of electric bridges (7),The driving port that 90 degree of electric bridges (7) connect double parallel Mach zehnder modulators (2) makes it work in push-pull mode,Bias voltage source (8) connects double parallel Mach zehnder modulators (2),Bias voltage is provided for it,Double parallel Mach zehnder modulators (2) are with being followed by Polarization Controller (9),The light output termination double drive MZ Mach-Zehnder (10) of Polarization Controller (9),The another way electric signal of 0 degree of electric bridge (4) connects quadrupler,The electricity output of quadrupler (11) terminates 90 degree of electric bridges (12),The 90 degree of electricity output ports and 0 degree of electricity output port of 90 degree of electric bridges (12) connect the first electric drive port and the second electric drive port of double drive MZ Mach-Zehnder respectively,The light output termination general single mode fiber (13) of double drive MZ Mach-Zehnder (10),General single mode fiber (13) output end exports triangle light pulse signal.
Description
Technical field
The present invention relates to the fields such as Microwave photonics, all-optical information processing, opto-electronic device, are specifically based on being transferred
The quadruple optics triangle generator of system.
Background technology
Microwave photonics are a subject for combining microwave technology and photonics applications, main research packet
Include high-speed wideband photonic device, the photon processing of microwave signal, analog optical link, supper-fast optical detection and measurement, microwave frequency
Measurement, optical servo system device etc..The research of microwave photon generator refer to using Microwave photonics technology generate big broadband, it is tunable,
The wide-band microwave and optical signal of low phase noise can specifically be divided into the pulse generation technology of random waveform and penetrating for high carrier frequency
Frequency microwave signal etc..Wherein, periodic triangular shape optical pulse train is a kind of periodical and has linear rise in time domain scale
With the special optical pulse train of failing edge.Using this special time-domain shape of triangle light pulse, make it in all-optical information processing
Technical field has been widely used.Triangle light pulse has play in all-optical information treatment technology more and more important
Role, also result in extensive concern in the industry, generate and other key technologies are widely studied.Optical triangulation shape pulse can
For all-optical data processing.For example, using the time domain specification of triangle light pulse, in conjunction with optical non-linear effect, triangle light
Pulse can realize efficient All Optical Wavelength Conversion.Optical triangulation shape pulse combination Cross-phase Modulation (XPM), can answer time-division multiplex
It is converted into wavelength-division multiplex (WDM) signal with (TDM) full light.Furthermore, it is possible to by the way that triangle is pumped the cross-phase tune that pulse generates
Propagation in system and dispersive medium is combined to realize optical signal time domain and frequency domain copy, pulse compression.Therefore, photon triangle
Impulse generator and its key technology are considered as the very research field of all-optical network one in future.
In recent years, a series of achievement in research of triangle optical pulse train generators is reported in succession both at home and abroad.It is wherein advantageous
The full light method of the principle to the shaping of light pulse of (FTTM) is mapped with frequency spectrum shaping and frequency time.The program is made with mode-locked laser
All-optical pulse shaping for light source is most popular method used by current acquisition symmetrical triangle light pulse.For example, 2011,
J.Ye of Southwest Jiaotong University et al. mentioned in their nearest achievements in research it is a kind of using polarization maintaining optical fibre, Polarization Controller and
The polarizer combines FTTM as spectral shaping unit, can obtain triangle light pulse (Ye J, Yan L, Pan W, et
al.Photonic generation of triangular-shaped pulses based on frequency-to-time
conversion[J].Optics letters. 2011,36(8):1458-1460.).2013, A.Zhang et al. research profits
It uses three groups of grating array as spectral shaping unit, the generation of random waveform, including symmetrical triangle light can be realized in conjunction with FTTM
Pulse (A. Zhang and C.Li, Analysis of dynamic optical arbitrary waveform
generation based on three FBG arrays[J].Optics&Laser Technology,2013,vol.52,
pp.81-86.).In addition to the above methods, also symmetrical triangle light pulse can be obtained using continuous-wave laser as light source.For example,
B.Dai from Univ Heriot Watt et al. carries out the comb spectrum that radio-frequency modulations generate similar pulse laser using to continuous light,
By adjusting radio-frequency modulations depth, electric phase difference and modulator bias point, amplitude to each spectral line of generated comb spectrum and
Phase is adjusted, and generation includes the pulse of a variety of time-domain shapes such as symmetrical triangle, zigzag, flat-top shape and sinusoidal
(B.Dai,Z.Gao,X.Wang,et al.Generation of Versatile Waveforms From CW Light
Using a Dual-Drive Mach-Zehnder Modulator and Employing Chromatic Dispersion
[J].Journal of Lightwave Technology,2013,vol.31, pp.145-151.).In addition, J.Li et al. is also
It proposes in a manner of harmonious wave fitting, using the radio-frequency power fading effect caused by continuous wave radio-frequency modulations and fibre-optical dispersion, obtains
Obtain method (J.Li, T.Ning, et al.Simulation study the on an of periodic undulations symmetrical triangle optical pulse train
improved frequency-doubled triangular-shaped pulse train generator with
reduced harmonic distortion[J].Chinese Optics Letters,2014,vol.12,pp.13-18.)。
However, spectral shaping method of the above-mentioned full light method using mode-locked laser as light source, scheme needs stable Mode-locked laser
Device, price is costly；Triangle optical pulse generator using continuous-wave laser as light source, tuning performance underaction, and
Repetitive rate is not high enough.For this purpose, design is a kind of simple in structure, and it is cheap, low frequency signal can be utilized to generate with higher heavy
Multiple rate or the generator of the optical triangulation pulse in smaller pulse duration are very important.
Invention content
The utility model is to provide a kind of quadruple optics triangle generator based on external modulation at low cost.With
Traditional generation method is different, and using continuous-wave laser as light source, signal passes through in two cascaded modulator (double parallels the present apparatus
Mach increases Dare modulator and double drive Mach and increases Dare modulator) in four times of radio-frequency modulations and double sideband modulation, output light
Signal is similar to impulse form, and strength retrogression's effect caused by the dispersion followed by general single mode fiber carries out light pulse whole
Shape, the parameter of regulating device obtain the triangle light pulse with high repetition frequency.Due to the use of four times of radio-frequency modulations, by
40GHz is can reach in the working frequency of current modulator, the present apparatus can generate repetition rate 160GHz triangle light pulses.This
Device is light source only with cheap continuous-wave laser, to so very big that reduce cost, with very high commercial value.
The technical solution of the utility model：A kind of quadruple optics triangle generator based on external modulation, it is special
Sign is：The triangle generator includes that continuous-wave laser, double parallel MZ Mach-Zehnder, sine wave are local
Oscillator, 0 ° of electric bridge, phase-shifter, power amplifier, 90 ° of electric bridges, bias voltage source, Polarization Controller, double drive Mach Zeng De
That modulator, quadrupler, general single mode fiber, detector；Specifically connection type is：
The light input end of the light output termination double parallel MZ Mach-Zehnder of continuous-wave laser, sine wave locally shake
The electricity output for swinging device terminates the electrical input of 0 degree of electric bridge, and the electricity output port of 0 degree of electric bridge connects the electrical input of phase-shifter, phase shift
The electrical input of the electricity output termination power amplifier of device, the electricity output of power amplifier terminate the electrical input of 90 degree of electric bridges,
The 90 degree of electricity output ports and 0 degree of electricity output port of 90 degree of electric bridges connect the first electric drive of double parallel Mach zehnder modulators respectively
Port and the second electric drive port, the voltage bias port of the output termination double parallel Mach zehnder modulators of bias voltage source,
The light input end of the light output termination Polarization Controller of double parallel Mach zehnder modulators, the light output end of Polarization Controller connect
The light input end of double drive MZ Mach-Zehnder, the electricity output port of 0 degree of electric bridge connect the electrical input of quadrupler, four times
The electricity output of frequency device terminates the electrical input of 90 degree of electric bridges, 90 degree of electricity output ports of 90 degree of electric bridges and 0 degree of electricity output port point
The the first electric drive port and the second electric drive port of double drive MZ Mach-Zehnder, double drive mach zhender tune are not connect
The light input end of the light output termination general single mode fiber of device processed, the light input of the light output termination detector of general single mode fiber
The output end at end, detector exports triangle light pulse signal.
Adjust the output voltage V of bias voltage sourcebias, make Vbias=Vπ.Wherein VπFor double parallel Mach zehnder modulators
(2) half-wave converts voltage, 2V≤Vπ≤4V.By two of double parallel Mach zehnder modulators MZ and mother MZ difference
It is offset to maximum transmitted point, maximum transmitted point, minimum transfer point；
Set index of modulation m1=π V1/Vπ1, the index of modulation needed for scheme meets 1 < m of condition1< 3, by adjusting sine wave
The sinusoidal signal amplitude V of local oscillator output1To obtain required modulation depth.
Double drive Mach zehnder modulators are offset to maximum transmitted point, the index of modulation m of double drive Mach zehnder modulators2
=π V2/Vπ2, the index of modulation needed for scheme meets condition m2=0.606, by the sine for adjusting the output of sine wave local oscillator
Signal amplitude V2To obtain required modulation depth；
The total dispersion amount β of general single mode fiber2L meets For the output of sine wave local oscillator
Sinusoidal signal, frequency are 1GHz≤fm≤50GHz；
By above-mentioned setting, general single mode fiber output is triangle light pulse, repetition rate f=4fm.
The concrete operating principle of the utility model is as follows：
By continuous-wave laser export optical electric field expression formula be：
Ein(t)=E0exp(jω0t) (1)
Wherein E0For optical signal magnitude, ω0Centered on angular frequency, then optical signal be input to double parallel horse by polarizer
Conspicuous Zeng Deer modulators.By the way that tri- bias points of DP-MZM are offset to maximum transmitted point, maximum transmitted point, minimum transfer point,
Modulator works in four times of radio-frequency modulations states.When the extinction ratio of DP-MZM is εrWhen=∞, the light field point of DP-MZM output ends
Cloth is
Wherein a4i-2=[j4i-2+j4i-2(-1)4i-2-(-1)4i-2-1]J4i-2(m1), Vπ1Indicate the half-wave conversion electricity of DP-MZM
Pressure.The driving radiofrequency signal expression formula of local radio-frequency oscillator output is Vrf1(t)=V1exp(jωmT), wherein V1And ωmPoint
It Biao Shi not RF signal amplitude and angular frequency.
Known modulation index m1=π V1/2Vπ1, work as m1Meet 1 < m of certain condition1When < 3, it can be found that 6 subharmonic and
10 subharmonic are very small, can be ignored.At this point, signal spectrum in only exist+2 and two primary sidebands of -2 rank.Therefore
The optical field distribution of DP-MZM output ends is represented by
EA(t)∝J-2(m1)exp(-j2ωmt)+J+2(m1)exp(j2ωmt) (3)
Then, signal enters DD-MZM and carries out light double-sideband modulation.Its drive signal is represented by Vrf2(t)=
V2exp(j4ωmt+θ).DD-MZM is placed in maximum transmitted point, modulator works in double sideband modulation state.In small signal modulation
Under, i.e. modulation index m2=π V2/Vπ2When smaller, the carrier wave and ± 1 rank sideband of double sideband modulation are only considered.At this point, DD-MZM is defeated
The optical field distribution of outlet is
By J-2(m)=J2(m) and J-1(m)=- J1(m) it substitutes into Eq. (4) and assumes A2=J0(m2)+J1(m2), A-2=J0
(m2)-J1(m2),A6=J1(m2) and A-6=-J1(m2), corresponding distribution of light intensity can be calculated as
Signal enters one section of general single mode fiber, curbs unwanted component cos (8 ωmt).The light field of signal at this time
Distribution and field strength are respectively：
The dispersion measure that can be calculated required optical fiber is
After unwanted harmonic component is filtered out, signal distribution of light intensity is represented by
The Fourier expansion formula of known ideal triangular is
It can be obtained by contrast (9) and formula (10), in order to obtain required triangle light pulse signal, need to meet+2 rank sides
Band and+6 rank sideband power differences are 9.5dB, i.e.,
This explanation can be with the temporal signatures of approximate representation symmetrical triangle using the fitting of preceding two order harmonics.It can be seen that the present apparatus from
It is absolutely feasible in principle.
Beneficial effects of the present invention are specific as follows：
The present invention is not related to complicated structure, makes full use of Electro-optical Modulation principle, and high repeat is produced in photonic propulsion method
The triangular wave of frequency, and scheme uses cheap continuous-wave laser, can greatly reduce acquisition cost.
Description of the drawings
A kind of quadruple optics triangle generators based on external modulation of Fig. 1.
The triangular wave time domain waveform schematic diagram (frequency f=8GHz) that Fig. 2 triangle optical pulse generators generate.
The triangular wave time domain waveform schematic diagram (frequency f=12GHz) that Fig. 3 triangle optical pulse generators generate.
The triangular wave time domain waveform schematic diagram (frequency f=16GHz) that Fig. 4 triangle optical pulse generators generate.
The triangular wave time domain waveform schematic diagram (frequency f=20GHz) that Fig. 5 triangle optical pulse generators generate.
Specific implementation mode
A kind of 1 to 5 pair of quadruple optics triangle generator work based on external modulation is further below in conjunction with the accompanying drawings
Description.
Embodiment one
A kind of quadruple optics triangle generator based on external modulation, as shown in Figure 1, it is characterised in that：This three
Angular impulse generator includes continuous-wave laser 1, double parallel MZ Mach-Zehnder 2,3,0 ° of sine wave local oscillator
Electric bridge 4, phase-shifter 5,6,90 ° of electric bridges 7 of power amplifier, bias voltage source 8, Polarization Controller 9, double drive mach zhender tune
Device 10 processed, quadrupler 11,90 ° of electric bridges 12, general single mode fiber 13, detectors 14；Specifically connection type is：
The light input end of the light output termination double parallel MZ Mach-Zehnder 2 of continuous-wave laser 1, sine wave are local
The electricity output of oscillator 3 terminates the electrical input of 0 degree of electric bridge 4, and the electricity output port 41 of 0 degree of electric bridge 4 connects the electricity input of phase-shifter 5
The electricity output at end, the electrical input of the electricity output termination power amplifier 6 of phase-shifter 5, power amplifier 6 terminates 90 degree of electric bridges 7
Electrical input, the 90 degree of electricity output ports 71 and 0 degree of electricity output port 72 of 90 degree of electric bridges 7 connect double parallel Mach once moral tune respectively
The the first electric drive port 21 and the second electric drive port 22 of device 2 processed, the output termination double parallel Mach Zeng De of bias voltage source 8
The voltage bias port 23 of modulator 2, the light input of the light output termination Polarization Controller 9 of double parallel Mach zehnder modulators 2
End, the light output end of Polarization Controller 9 connect the light input end of double drive MZ Mach-Zehnder 10, and the electricity of 0 degree of electric bridge 4 is defeated
Exit port 42 connects the electrical input of quadrupler 11, and the electricity output of quadrupler 11 terminates the electrical input of 90 degree of electric bridges 12, and 90
The 90 degree of electricity output ports 121 and 0 degree of electricity output port 122 for spending electric bridge 12 connect double drive MZ Mach-Zehnder 10 respectively
The first electric drive port 101 and the second electric drive port 102, double drive MZ Mach-Zehnder 10 light output termination
The light input end of general single mode fiber 13, the light input end of the light output termination detector 14 of general single mode fiber 13, detector
14 output end exports triangle light pulse signal.
Adjust the output voltage V of bias voltage source 8bias, make Vbias=Vπ=2V.Wherein VπFor double parallel Mach once moral tune
The half-wave of device 2 processed converts voltage.Two of double parallel Mach zehnder modulators 2 sub- MZ and mother MZ are offset to maximum respectively
Transfer point, maximum transmitted point, minimum transfer point；
Set index of modulation m1=π V1/Vπ1, the index of modulation needed for scheme meets 1 < m of condition1< 3 (takes m1=1.25 are
Example), the sinusoidal signal amplitude V exported by adjusting sine wave local oscillator 31To obtain required modulation depth.
Double drive Mach zehnder modulators 10 are offset to maximum transmitted point, the index of modulation of double drive Mach zehnder modulators
m2=π V2/Vπ2, the index of modulation needed for scheme meets condition m2=0.606, by adjusting the output of sine wave local oscillator 3 just
String signal amplitude V2To obtain required modulation depth；
The total dispersion amount β of general single mode fiber 132L meets For sine wave local
The output sinusoidal signal of oscillator 3, frequency fm=2GHz；
By above-mentioned setting, general single mode fiber 13) it exports as triangle light pulse, repetition rate f=4fm=
8GHz。
The present embodiment εrValue is 30dB, fm=2GHz, Vπ=2V.After above-mentioned adjusting, the output of optical fiber 13 is triangle
Light pulse, repetition rate f=4fm=8GHz, shown in corresponding time-domain curve Fig. 2.
Embodiment two
A kind of quadruple optics triangle generator based on external modulation, as shown in Figure 1, it is characterised in that：This three
Angular impulse generator includes continuous-wave laser 1, double parallel MZ Mach-Zehnder 2,3,0 ° of sine wave local oscillator
Electric bridge 4, phase-shifter 5,6,90 ° of electric bridges 7 of power amplifier, bias voltage source 8, Polarization Controller 9, double drive mach zhender tune
Device 10 processed, quadrupler 11,90 ° of electric bridges 12, general single mode fiber 13, detectors 14；Specifically connection type is：
The light input end of the light output termination double parallel MZ Mach-Zehnder 2 of continuous-wave laser 1, sine wave are local
The electricity output of oscillator 3 terminates the electrical input of 0 degree of electric bridge 4, and the electricity output port 41 of 0 degree of electric bridge 4 connects the electricity input of phase-shifter 5
The electricity output at end, the electrical input of the electricity output termination power amplifier 6 of phase-shifter 5, power amplifier 6 terminates 90 degree of electric bridges 7
Electrical input, the 90 degree of electricity output ports 71 and 0 degree of electricity output port 72 of 90 degree of electric bridges 7 connect double parallel Mach once moral tune respectively
The the first electric drive port 21 and the second electric drive port 22 of device 2 processed, the output termination double parallel Mach Zeng De of bias voltage source 8
The voltage bias port 23 of modulator 2, the light input of the light output termination Polarization Controller 9 of double parallel Mach zehnder modulators 2
End, the light output end of Polarization Controller 9 connect the light input end of double drive MZ Mach-Zehnder 10, and the electricity of 0 degree of electric bridge 4 is defeated
Exit port 42 connects the electrical input of quadrupler 11, and the electricity output of quadrupler 11 terminates the electrical input of 90 degree of electric bridges 12, and 90
The 90 degree of electricity output ports 121 and 0 degree of electricity output port 122 for spending electric bridge 12 connect double drive MZ Mach-Zehnder 10 respectively
The first electric drive port 101 and the second electric drive port 102, double drive MZ Mach-Zehnder 10 light output termination
The light input end of general single mode fiber 13, the light input end of the light output termination detector 14 of general single mode fiber 13, detector
14 output end exports triangle light pulse signal.
Adjust the output voltage V of bias voltage source 8bias, make Vbias=Vπ=2V.Wherein VπFor double parallel Mach once moral tune
The half-wave of device 2 processed converts voltage.Two of double parallel Mach zehnder modulators 2 sub- MZ and mother MZ are offset to maximum respectively
Transfer point, maximum transmitted point, minimum transfer point；
Set index of modulation m1=π V1/Vπ1, the index of modulation needed for scheme meets 1 < m of condition1< 3 (takes m1=1.25 are
Example), the sinusoidal signal amplitude V exported by adjusting sine wave local oscillator 31To obtain required modulation depth.
Double drive Mach zehnder modulators 10 are offset to maximum transmitted point, the index of modulation of double drive Mach zehnder modulators
m2=π V2/Vπ2, the index of modulation needed for scheme meets condition m2=0.606, by adjusting the output of sine wave local oscillator 3 just
String signal amplitude V2To obtain required modulation depth；
The total dispersion amount β of general single mode fiber 132L meets For sine wave local
The output sinusoidal signal of oscillator 3, frequency fm=3GHz；
By above-mentioned setting, the output of general single mode fiber 13 is triangle light pulse, repetition rate f=4fm=
8GHz。
The present embodiment εrValue is 30dB, fm=3GHz, Vπ=2V.After above-mentioned adjusting, the output of optical fiber 13 is triangle
Light pulse, repetition rate f=4fm=12GHz, shown in corresponding time-domain curve Fig. 3.
Embodiment three
A kind of quadruple optics triangle generator based on external modulation, as shown in Figure 1, it is characterised in that：This three
Angular impulse generator includes continuous-wave laser 1, double parallel MZ Mach-Zehnder 2,3,0 ° of sine wave local oscillator
Electric bridge 4, phase-shifter 5,6,90 ° of electric bridges 7 of power amplifier, bias voltage source 8, Polarization Controller 9, double drive mach zhender tune
Device 10 processed, quadrupler 11,90 ° of electric bridges 12, general single mode fiber 13, detectors 14；Specifically connection type is：
The light input end of the light output termination double parallel MZ Mach-Zehnder 2 of continuous-wave laser 1, sine wave are local
The electricity output of oscillator 3 terminates the electrical input of 0 degree of electric bridge 4, and the electricity output port 41 of 0 degree of electric bridge 4 connects the electricity input of phase-shifter 5
The electricity output at end, the electrical input of the electricity output termination power amplifier 6 of phase-shifter 5, power amplifier 6 terminates 90 degree of electric bridges 7
Electrical input, the 90 degree of electricity output ports 71 and 0 degree of electricity output port 72 of 90 degree of electric bridges 7 connect double parallel Mach once moral tune respectively
The the first electric drive port 21 and the second electric drive port 22 of device 2 processed, the output termination double parallel Mach Zeng De of bias voltage source 8
The voltage bias port 23 of modulator 2, the light input of the light output termination Polarization Controller 9 of double parallel Mach zehnder modulators 2
End, the light output end of Polarization Controller 9 connect the light input end of double drive MZ Mach-Zehnder 10, and the electricity of 0 degree of electric bridge 4 is defeated
Exit port 42 connects the electrical input of quadrupler 11, and the electricity output of quadrupler 11 terminates the electrical input of 90 degree of electric bridges 12, and 90
The 90 degree of electricity output ports 121 and 0 degree of electricity output port 122 for spending electric bridge 12 connect double drive MZ Mach-Zehnder 10 respectively
The first electric drive port 101 and the second electric drive port 102, double drive MZ Mach-Zehnder 10 light output termination
The light input end of general single mode fiber 13, the light input end of the light output termination detector 14 of general single mode fiber 13, detector
14 output end exports triangle light pulse signal.
Adjust the output voltage V of bias voltage source 8bias, make Vbias=Vπ=2V.Wherein VπFor double parallel Mach once moral tune
The half-wave of device 2 processed converts voltage.Two of double parallel Mach zehnder modulators 2 sub- MZ and mother MZ are offset to maximum respectively
Transfer point, maximum transmitted point, minimum transfer point；
Set index of modulation m1=π V1/Vπ1, the index of modulation needed for scheme meets 1 < m of condition1< 3 (takes m1=1.25 are
Example), the sinusoidal signal amplitude V exported by adjusting sine wave local oscillator 31To obtain required modulation depth.
Double drive Mach zehnder modulators 10 are offset to maximum transmitted point, the index of modulation of double drive Mach zehnder modulators
m2=π V2/Vπ2, the index of modulation needed for scheme meets condition m2=0.606, by adjusting the output of sine wave local oscillator 3 just
String signal amplitude V2To obtain required modulation depth；
The total dispersion amount β of general single mode fiber 132L meets For sine wave local
The output sinusoidal signal of oscillator 3, frequency fm=4GHz；
By above-mentioned setting, the output of general single mode fiber 13 is triangle light pulse, repetition rate f=4fm=
8GHz。
The present embodiment εrValue is 30dB, fm=4GHz, Vπ=2V.After above-mentioned adjusting, the output of optical fiber 13 is triangle
Light pulse, repetition rate f=4fm=16GHz, shown in corresponding time-domain curve Fig. 4.
Example IV
A kind of quadruple optics triangle generator based on external modulation, as shown in Figure 1, it is characterised in that：This three
Angular impulse generator includes continuous-wave laser 1, double parallel MZ Mach-Zehnder 2,3,0 ° of sine wave local oscillator
Electric bridge 4, phase-shifter 5,6,90 ° of electric bridges 7 of power amplifier, bias voltage source 8, Polarization Controller 9, double drive mach zhender tune
Device 10 processed, quadrupler 11,90 ° of electric bridges 12, general single mode fiber 13, detectors 14；Specifically connection type is：
The light input end of the light output termination double parallel MZ Mach-Zehnder 2 of continuous-wave laser 1, sine wave are local
The electricity output of oscillator 3 terminates the electrical input of 0 degree of electric bridge 4, and the electricity output port 41 of 0 degree of electric bridge 4 connects the electricity input of phase-shifter 5
The electricity output at end, the electrical input of the electricity output termination power amplifier 6 of phase-shifter 5, power amplifier 6 terminates 90 degree of electric bridges 7
Electrical input, the 90 degree of electricity output ports 71 and 0 degree of electricity output port 72 of 90 degree of electric bridges 7 connect double parallel Mach once moral tune respectively
The the first electric drive port 21 and the second electric drive port 22 of device 2 processed, the output termination double parallel Mach Zeng De of bias voltage source 8
The voltage bias port 23 of modulator 2, the light input of the light output termination Polarization Controller 9 of double parallel Mach zehnder modulators 2
End, the light output end of Polarization Controller 9 connect the light input end of double drive MZ Mach-Zehnder 10, and the electricity of 0 degree of electric bridge 4 is defeated
Exit port 42 connects the electrical input of quadrupler 11, and the electricity output of quadrupler 11 terminates the electrical input of 90 degree of electric bridges 12, and 90
The 90 degree of electricity output ports 121 and 0 degree of electricity output port 122 for spending electric bridge 12 connect double drive MZ Mach-Zehnder 10 respectively
The first electric drive port 101 and the second electric drive port 102, double drive MZ Mach-Zehnder 10 light output termination
The light input end of general single mode fiber 13, the light input end of the light output termination detector 14 of general single mode fiber 13, detector
14 output end exports triangle light pulse signal.
Adjust the output voltage V of bias voltage source 8bias, make Vbias=Vπ=2V.Wherein VπFor double parallel Mach once moral tune
The half-wave of device 2 processed converts voltage.Two of double parallel Mach zehnder modulators 2 sub- MZ and mother MZ are offset to maximum respectively
Transfer point, maximum transmitted point, minimum transfer point；
Set index of modulation m1=π V1/Vπ1, the index of modulation needed for scheme meets 1 < m of condition1< 3 (takes m1=1.25 are
Example), the sinusoidal signal amplitude V exported by adjusting sine wave local oscillator 31To obtain required modulation depth.
Double drive Mach zehnder modulators 10 are offset to maximum transmitted point, the index of modulation of double drive Mach zehnder modulators
m2=π V2/Vπ2, the index of modulation needed for scheme meets condition m2=0.606, by adjusting the output of sine wave local oscillator 3 just
String signal amplitude V2To obtain required modulation depth；
The total dispersion amount β of general single mode fiber 132L meets For sine wave local
The output sinusoidal signal of oscillator 3, frequency fm=5GHz；
By above-mentioned setting, the output of general single mode fiber 13 is triangle light pulse, repetition rate f=4fm=
8GHz。
The present embodiment εrValue is 30dB, fm=5GHz, Vπ=2V.After above-mentioned adjusting, the output of optical fiber 13 is triangle
Light pulse, repetition rate f=4fm=20GHz, shown in corresponding time-domain curve Fig. 5.
Claims (2)
1. the quadruple optics triangle generator based on external modulation, it is characterised in that：The triangle generator packet
It includes, continuous-wave laser (1), double parallel MZ Mach-Zehnder (2), sine wave local oscillator (3), 0 ° of electric bridge (4), phase
Moved device (5), power amplifier (6), the one 90 ° of electric bridge (7), bias voltage source (8), Polarization Controller (9), double drive Mach once
Dare modulator (10), quadrupler (11), the 2nd 90 ° of electric bridge (12), general single mode fiber (13)；Specifically connection type is：
The light input end of the light output termination double parallel MZ Mach-Zehnder (2) of continuous-wave laser (1), sine wave are local
The electricity output of oscillator (3) terminates the electrical input of 0 degree of electric bridge (4), and the first electricity output port (41) of 0 degree of electric bridge (4) connects phase
Move the electrical input of device (5), the electrical input of the electricity output termination power amplifier (6) of phase-shifter (5), power amplifier (6)
Electricity output terminate the electrical inputs of 90 degree of electric bridges (7), 90 degree of electricity output ports (71) of 90 degree of electric bridges (7) and 0 degree of electricity output
Port (72) connects double parallel Mach the first electric drive of zehnder modulators port (21) of double parallel Mach zehnder modulators (2) respectively
With double parallel Mach the second electric drive of zehnder modulators port (22), the output termination double parallel Mach of bias voltage source (8) was once
The light output of the voltage bias port (23) of moral modulator (2), double parallel Mach zehnder modulators (2) terminates Polarization Controller
(9) light input end, the light output end of Polarization Controller (9), connects the light input end of double drive MZ Mach-Zehnder (10),
Second electricity output port (42) of 0 degree of electric bridge (4) connects the electrical input of quadrupler (11), the electricity output end of quadrupler (11)
Connect the electrical input of 90 degree of electric bridges (12), 90 degree of electricity output ports (121) of 90 degree of electric bridges (12) and 0 degree of electricity output port
(122) the first electric drive of double drive MZ Mach-Zehnder port of double drive MZ Mach-Zehnder (10) is connect respectively
(101) and the second electric drive of double drive MZ Mach-Zehnder port (102), double drive MZ Mach-Zehnder (10)
Light output terminates the light input end of general single mode fiber (13), and the light output end of general single mode fiber (13) exports triangle light arteries and veins
Rush signal.
2. a kind of quadruple optics triangle generator based on external modulation according to claim 1, feature exist
In：
Adjust the output voltage V of bias voltage source (8)bias, make Vbias=Vπ, wherein VπFor double parallel Mach zehnder modulators (2)
Half-wave convert voltage, 2V≤Vπ≤ 4V, two of double parallel Mach zehnder modulators (2) sub- MZ and mother MZ difference are inclined
It is placed in maximum transmitted point, maximum transmitted point, minimum transfer point；
Set index of modulation m1=π V1/Vπ1, the index of modulation needed for scheme meets 1 < m of condition1< 3, it is local by adjusting sine wave
The sinusoidal signal amplitude V of oscillator (3) output1To obtain required modulation depth；
Double drive Mach zehnder modulators (10) are offset to maximum transmitted point, the index of modulation m of double drive Mach zehnder modulators2
=π V2/Vπ2, the index of modulation needed for scheme meets condition m2=0.606, by adjusting sine wave local oscillator (3) output
Sinusoidal signal amplitude V2To obtain required modulation depth；
The total dispersion amount β of general single mode fiber (13)2L meets For the defeated of sine wave local oscillator (3)
Go out sinusoidal signal, frequency is 1GHz≤fm≤50GHz；
By above-mentioned setting, general single mode fiber (13) output is triangle light pulse, repetition rate f=4fm。
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| CN112448768A (en) * | 2020-11-12 | 2021-03-05 | 暨南大学 | Multi-octave microwave transmission device and multi-octave microwave transmission method |
| CN114070409A (en) * | 2020-07-31 | 2022-02-18 | 北京交通大学 | Triangular waveform generator with adjustable symmetry factor based on dual-polarization modulator |
| CN114978307A (en) * | 2022-05-20 | 2022-08-30 | 北京交通大学 | Single-branch detection instantaneous frequency measurement system based on polarization maintaining optical fiber birefringence effect |
| CN113972953B (en) * | 2020-07-24 | 2024-02-02 | 北京交通大学 | Triangular waveform generator based on two single-drive Mach-Zehnder modulators |
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2018
- 2018-01-04 CN CN201820011648.2U patent/CN208079086U/en not_active Expired - Fee Related
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| CN113972953B (en) * | 2020-07-24 | 2024-02-02 | 北京交通大学 | Triangular waveform generator based on two single-drive Mach-Zehnder modulators |
| CN114070409A (en) * | 2020-07-31 | 2022-02-18 | 北京交通大学 | Triangular waveform generator with adjustable symmetry factor based on dual-polarization modulator |
| CN114070409B (en) * | 2020-07-31 | 2024-02-06 | 北京交通大学 | Triangular waveform generator with adjustable symmetry factor based on dual polarization modulator |
| CN112448768A (en) * | 2020-11-12 | 2021-03-05 | 暨南大学 | Multi-octave microwave transmission device and multi-octave microwave transmission method |
| CN114978307A (en) * | 2022-05-20 | 2022-08-30 | 北京交通大学 | Single-branch detection instantaneous frequency measurement system based on polarization maintaining optical fiber birefringence effect |
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