CN106301586B - A kind of optical triangulation shape impulse generator with tunable repetition rate - Google Patents
A kind of optical triangulation shape impulse generator with tunable repetition rate Download PDFInfo
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- CN106301586B CN106301586B CN201510239686.4A CN201510239686A CN106301586B CN 106301586 B CN106301586 B CN 106301586B CN 201510239686 A CN201510239686 A CN 201510239686A CN 106301586 B CN106301586 B CN 106301586B
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Abstract
A kind of optical triangulation shape impulse generator with tunable repetition rate,It is related to opto-electronic device,Microwave photonics,All-optical data process field,Continuous-wave laser (1) connects the first Polarization Controller (2) first,Subsequent Polarization Controller (2) connects double parallel MZ Mach-Zehnder (3),Sine wave local oscillator (4) connects 90 degree of electric bridges (5),The driving port that 90 degree of electric bridges (5) connect double parallel Mach zehnder modulators (3) makes it work in push-pull mode,Bias voltage source (6) connects double parallel Mach zehnder modulators (3),Bias voltage is provided for it,Double parallel Mach zehnder modulators (3) are with being followed by light Interleaver (7) and the second Polarization Controller (8) is that two ways of optical signals after separation is respectively placed in orthogonal polarisation state,It is combined into all the way by polarization beam apparatus (9) afterwards,By third Polarization Controller (10),Then one phase-modulator (11) of access carries out phase-modulation,90 ° of phase shift is introduced between two polarization states,Bias voltage source (12) is that phase-modulator (11) provides driving DC voltage,By the 4th Polarization Controller (13) the access polarizer (14) after phase-modulator (11),Original mixed polarized of optical signals becomes single polarization,To export triangle optical pulse train.
Description
Technical field
The present invention relates to opto-electronic device, Microwave photonics, all-optical data process field, specifically a kind of have can
Tune the optical triangulation shape impulse generator of repetition rate.
Background technology
All-optical signal processing technology is the important component of all-optical communication network, is the emphasis studied both at home and abroad at present.
In all-optical signal processing, periodic triangular shape optical pulse train is a kind of periodical and in time domain scale there is front and back edge to determine very much change
The special optical pulse train changed, rising edge and failing edge may be considered the constant straight line of slope, generation and other crucial skills
Art is widely studied.Optical triangulation shape pulse can be used for all-optical data processing.For example, the time domain using triangle light pulse is special
Property, in conjunction with optical non-linear effect, triangle light pulse can realize efficient All Optical Wavelength Conversion.Optical triangulation shape pulse, which combines, hands over
Phase-modulation is pitched, the full light of time division multiplexing can be converted into wavelength-division multiplex signals.In conjunction with Cross-phase Modulation and non-linear gram
Your effect, symmetrical triangle light pulse is as pumping the time domain that can be also used for light pulse signal and frequency domain while copying.In addition,
It can be combined by the propagation pumped triangle in the Cross-phase Modulation and dispersive medium that pulse generates to realize that pulse is compressed
Deng.Therefore, photon triangle generator is considered as following one very important equipment of all-optical network.
In recent years, a series of achievement in research of triangle light pulse photon generators is reported in succession in the world.With mode locking
Laser is most popular method used by current acquisition symmetrical triangle light pulse as the all-optical pulse shaping of light source.Example
Such as, 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, partially
Controller and the polarizer shake as spectral shaping unit, and combines FTTM, 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 and utilizations grating array can realize the generation of random waveform in conjunction with FTTM as spectral shaping unit, including
Symmetrical triangle light 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.).But the above-mentioned spectral shaping method using mode-locked laser as light source, scheme need steady
Fixed Mode-locked laser device, price are very expensive.In order to improve, symmetric triangular can be obtained using continuous-wave laser as light source
Shape light pulse.For example, B.Dai et al. carries out the comb spectrum that radio-frequency modulations generate similar pulse laser using to continuous light, to institute
The amplitude and phase of each spectral line of comb spectrum of generation are adjusted, and generation includes symmetrical triangle, zigzag, flat-top shape and just
Pulse (B.Dai, Z.Gao, X.Wang, et al.Generation of Versatile of a variety of time-domain shapes such as string shape
Waveforms From CW Light Using a Dual-Drive Mach-Zehnder Modulator and
Employing Chromatic Dispersion[J].IEEE/OSA Journal of Lightwave Technology,
2013,vol.31,pp.145-151.).In addition, J.Li et al. also proposed in a manner of harmonious wave fitting, continuous wave radio frequency is utilized
Radio-frequency power fading effect caused by modulation and fibre-optical dispersion, the method for obtaining periodic undulations symmetrical triangle optical pulse train
(J.Li,X.Zhang,B.Hraimel,et al.Performance Analysis of a Photonic-Assisted
Periodic Triangular-Shaped Pulses Generator[J].IEEE/OSA Journal of Lightwave
Technology,2012,vol.30,pp.1617-1624.).The above-mentioned triangle light arteries and veins using continuous-wave laser as light source
Generator is rushed, fiber lengths range is fixed, system underaction, and repetitive rate is not high enough.For this purpose, design is a kind of simple in structure,
It is cheap, the depleted fibre of long distance transmission can be saved, generating has higher repetitive rate or smaller pulse duration
The generator of optical triangulation pulse be very important.The present invention is only by changing the driving frequency of local oscillator offer just
The tuning of repetition rate may be implemented.In addition, the use of four times of radio-frequency modulations technologies so that pulse train is generated with higher
Repetitive rate or smaller pulse duration are possibly realized.
Invention content
The present invention is to provide a kind of optical triangulation shape impulse generator with tunable repetition rate at low cost.With biography
The generation method of system is different, and the present apparatus is using continuous-wave laser as light source, and the double parallel Mach cut using a z- once modulate by moral
Device makes two sub- modulator and a female modulator work in maximum transmitted point, maximum transmitted point, minimum transfer point respectively,
Output light signal is similar to impulse form at this time.By selecting modulation index appropriate that modulator is made to be in four times of radio frequency tune
System is, it can be achieved that optical carrier suppression is modulated.The signal obtained is sent to a light Interleaver to detach optical sideband,
And so that two ways of optical signals is respectively placed in two orthogonal polarisation states by Polarization Controller, it is combined into all the way by polarization beam apparatus.It connects down
To utilize a phase-modulator progress Polarization Modulation, the phase shift of 90 ° of introducing between two polarization states.After phase-modulator
Access the polarizer, original mixed polarized of optical signals becomes single polarization, to obtain the triangle with high repetition frequency
Light pulse.The working frequency of modulator can reach 40GHz at present, and due to the use of four times of radio-frequency modulations, the present apparatus can generate weight
Complex frequency 160GHz triangle light pulses.In addition, the present apparatus is light source only with cheap continuous-wave laser, obtained to very big
Reduce cost；And in view of biasing point drift so that the present apparatus has very high commercial value.
Technical scheme of the present invention：A kind of optical triangulation shape impulse generator with tunable repetition rate, feature
It is：The triangle generator includes, continuous-wave laser, Polarization Controller, double parallel MZ Mach-Zehnder, just
String wave local oscillator, bias voltage source, light Interleaver, polarization beam apparatus, phase-modulator, is polarized 90 ° of electric bridges
Device；Specifically connection type is：
The input terminal of the light output termination Polarization Controller of continuous-wave laser, the output termination of the first Polarization Controller are double
The light input end of parallel MZ Mach-Zehnder, the electricity output of sine wave local oscillator terminate the electricity input of 90 degree of electric bridges
End, the 90 degree of electricity output ports and 0 degree of electricity output port of 90 degree of electric bridges connect the first electricity of double parallel Mach zehnder modulators respectively
Drive port and the second electric drive port, the voltage bias of the electricity output termination double parallel Mach zehnder modulators of bias voltage source
Port, the light input end of the light output termination light Interleaver of double parallel Mach zehnder modulators, it is multiple that light intersects wavelength-division
Connect the light input end of the second Polarization Controller, the light of the second Polarization Controller respectively with the first output end and second output terminal of device
Output end connects the first input end and the second input terminal of polarization beam apparatus, the light output termination third polarization of polarization beam apparatus respectively
The light input end of controller, the light input end of the light output termination phase-modulator of third Polarization Controller, bias voltage source
Electricity output terminates the voltage bias port of phase-modulator, and the light of light output the 4th Polarization Controller of termination of phase-modulator is defeated
Enter end, the light output end of the 4th Polarization Controller connects the light input end of the polarizer, and the light output end of the polarizer exports triangle light
Pulse.
Adjust the output voltage V of bias voltage sourcebias, make Vbias=Vπ, wherein VπFor double parallel Mach zehnder modulators
Half-wave converts voltage, and 2V≤Vπ≤4V；Two of double parallel Mach zehnder modulators MZ and mother MZ are biased respectively
In maximum transmitted point, maximum transmitted point, minimum transfer point；
Set index of modulation m=π VRF/2Vπ=4.165, adjust the sinusoidal signal amplitude of sine wave local oscillator output
VRF=2.825Vπ；
Adjust polarizer polarization angle α=60 ° of the polarizer；
The output sinusoidal signal frequency of sine wave local oscillator (4) is fRF, in the range of 1GHz≤fRF≤40GHz；
The bias voltage source offset Δ V of double parallel MZ Mach-Zehnderbias, in the range of -1%≤Δ Vbias≤
0.5%
By above-mentioned setting, polarizer output is triangle light pulse, repetition rate f=4fRF。
The concrete operating principle of the present invention is as follows：
By continuous-wave laser export optical electric field expression formula be：
Ein(t)=E0exp(jω0t) (1)
Wherein E0And ω0Indicate its amplitude and angular frequency, then optical signal is input to double parallel Mach Zeng De by polarizer
That modulator.It is V for driving the RF signals of DP-MZMRFcos(ωRFT), wherein VRFAnd ωRF/ 2 π indicate the amplitude of RF signals
And frequency.When the extinction ratio of DP-MZM is εrWhen=∞, the optical field distribution of DP-MZM output ends is：
Wherein, a4k-2=[j4k-2+j4k-2(-1)4k-2-(-1)4k-2-1]J4k-2(m), VπIndicate the half-wave conversion electricity of DP-MZM
Pressure.Jn() indicates n rank Bessel function of the first kind.M is modulation index, m=π VRF/2Vπ.And 10 subharmonic of signal is very small,
It can be ignored.At this point, E1(t) it only needs to consider ± 2 ranks and ± 6 rank optical sidebands.The optical field distribution of A points can be reduced to：
Wherein, a-6=-4J-6(m), a-2=-4J-2(m), a2=-4J2(m), a6=-4J6(m)。
The wavelength-division multiplex signals of input can be divided into multiple channels by light Interleaver according to fixed frequency interval,
Then split tunnel is empirically required.Through the modulated signals of DP-MZM by the OI of a 50/100GHz by interior sideband k=± 2
Optical sideband is detached with ± 6 optical sidebands of outer sideband k=.Polarization beam apparatus output palarization multiplexing after optical field distribution be:
Due toWithIt is two orthogonal polarization directions, beat frequency is not present between them.E at this time2(t) and do not have
Single polarization state.Before PM, be inserted into PC3 adjust merge after optical signal polarization state and PM main shafts be in 45° angle, then phase
Signal in two polarization states of modulator pair distinguishes phase modulation, and 90 ° of phase shift is introduced between two polarization states.Phase modulated device
There are TE moulds and TM moulds in the signal light field of modulation.WithThe half-wave voltage of TE moulds and TM moulds is indicated respectively.Due to using
Phase-modulator cut for z, then existThe driving DC voltage of phase-modulator isIt enables
The main shaft of PM withIt overlaps.The optical signal of output is：
E3(t) using a polarizer, original mixed polarized of optical signals becomes single polarization.It is deep in order to reduce modulation
Degree, the polarizer selects larger polarization phase angle [alpha], and ensuresModulation index m is given with reference to figure 2
With the relationship of polarizer polarization angle α, with the increase of α, modulation index reduces, and realizes target.Scheme is using polarization phase
The polarizer that position is 60 °.At this point, havingFig. 3 gives Bessel function of the first kind J2(m) it and modulates
Exponent m relationship, Fig. 4 give Bessel function of the first kind J6(m) and modulation index m relationship, it is seen that as m=4.165This optical signal expression formula is：
Then E4(t) corresponding distribution of light intensity is represented by:
The Fourier expansion formula of ideal triangular waveform：
Comparison expression (7) and formula (8), it is assumed that the ω of Ω=4RF, as m=4.165, haveOutput light field
Intensity Iout(t) each order harmonics weights are consistent with the Fourier expansion formula of ideal triangular waveform, and E at this time4(t) have single
Polarization state.
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；Medium-PRF of the present invention has the characteristic of continuously adjustable, only changes local frequency, can be to three
The repetition rate of angular light pulse is tuned；And scheme uses cheap continuous-wave laser, can greatly reduce and obtain
Obtain cost.
Description of the drawings
A kind of optical triangulation shape impulse generators with tunable repetition rate of Fig. 1.
The relationship of Fig. 2 modulation index ms and polarizer polarization angle α.
Fig. 3 Bessel function of the first kind J2(m) and the relationship m of modulation index.
Fig. 4 Bessel function of the first kind J6(m) and the relationship m of modulation index.
The triangular wave time domain waveform schematic diagram (frequency f=5GHz) that Fig. 5 triangle optical pulse generators generate.
The triangular wave time domain waveform schematic diagram (frequency f=7.5GHz) that Fig. 6 triangle optical pulse generators generate.
The triangular wave time domain waveform schematic diagram (frequency f=10GHz) that Fig. 7 triangle optical pulse generators generate.
Specific implementation mode
A kind of 1 to 7 pair of optical triangulation shape impulse generator with tunable repetition rate is made into one below in conjunction with the accompanying drawings
Step description.
Embodiment one
A kind of optical triangulation shape impulse generator with tunable repetition rate, as shown in Figure 1, it is characterised in that：It should
Triangle generator includes, continuous-wave laser 1, the first Polarization Controller 2, double parallel MZ Mach-Zehnder 3, just
4,90 ° of electric bridges 5 of string wave local oscillator, bias voltage source 6, light Interleaver 7, the second Polarization Controller 8, polarization point
Beam device 9, third Polarization Controller 10, phase-modulator 11, bias voltage source 12, the 4th Polarization Controller 13, the polarizer 14；Tool
Body connection type is：
The light output of continuous-wave laser 1 terminates the input terminal of the first Polarization Controller 2, the first Polarization Controller 2 it is defeated
Go out to terminate the light input end of double parallel MZ Mach-Zehnder 3, the electricity output of sine wave local oscillator 4 terminates 90 degree of electric bridges
5 electrical input, the 90 degree of electricity output ports 51 and 0 degree of electricity output port 52 of 90 degree of electric bridges 5 meet double parallel Mach Zeng De respectively
The the first electric drive port 31 and the second electric drive port 32 of modulator 3, the output termination double parallel Mach of bias voltage source 6 was once
The voltage bias port 33 of moral modulator 3, the light output termination light Interleaver 7 of double parallel Mach zehnder modulators 3
Light input end, the first output end 71 and second output terminal 72 of light Interleaver connect the second Polarization Controller 8 respectively
Light input end, 8 light output end of the second Polarization Controller connects the first input end 91 and the second input terminal of polarization beam apparatus 9 respectively
92, the light input end of the light output termination third Polarization Controller 10 of polarization beam apparatus 9, the light output of third Polarization Controller 10
The light input end 111 of phase-modulator 11 is terminated, the light output end 112 of phase-modulator 11 connects the light of the 4th Polarization Controller 13
Input terminal, the voltage bias port 113 of the electricity output termination phase-modulator 11 of bias voltage source 12, the 4th Polarization Controller 13
Light output end connect the light input end of the polarizer 14, the light output end of the polarizer exports triangle light pulse.
Adjust the output voltage V of bias voltage source 6bias, enable Vbias=Vπ=2V, wherein VπFor double parallel Mach once moral tune
The half-wave of device 3 processed converts voltage.Two of double parallel Mach zehnder modulators 3 sub- MZ and mother MZ are offset to maximum respectively
Transfer point, maximum transmitted point, minimum transfer point；
Set index of modulation m=π VRF/2Vπ=4.165, adjust the sinusoidal signal amplitude of 4 output of sine wave local oscillator
VRF=2.825Vπ=5.65V, wherein Vπ=2V is that the half-wave of double parallel Mach zehnder modulators 3 converts voltage；
Adjust polarizer polarization angle α=60 ° of the polarizer；
The output sinusoidal signal frequency f of sine wave local oscillator 4RF=5GHz；
The bias voltage source offset Δ V of double parallel MZ Mach-Zehnder 3bias=0.5%；
The extinction ratio ε of the present embodiment modulatorrValue is 30dB, Δ VbiasValue is 0.5%, fRF=5GHz, Vπ=2V,
After above-mentioned adjusting, the output of the polarizer 14 is triangle light pulse, repetition rate f=4fRF=20GHz, corresponding time domain are bent
Shown in line chart 5.
Embodiment two
A kind of optical triangulation shape impulse generator with tunable repetition rate, as shown in Figure 1, it is characterised in that：It should
Triangle generator includes, continuous-wave laser 1, the first Polarization Controller 2, double parallel MZ Mach-Zehnder 3, just
4,90 ° of electric bridges 5 of string wave local oscillator, bias voltage source 6, light Interleaver 7, the second Polarization Controller 8, polarization point
Beam device 9, third Polarization Controller 10, phase-modulator 11, bias voltage source 12, the 4th Polarization Controller 13, the polarizer 14；Tool
Body connection type is：
The light output of continuous-wave laser 1 terminates the input terminal of the first Polarization Controller 2, the first Polarization Controller 2 it is defeated
Go out to terminate the light input end of double parallel MZ Mach-Zehnder 3, the electricity output of sine wave local oscillator 4 terminates 90 degree of electric bridges
5 electrical input, the 90 degree of electricity output ports 51 and 0 degree of electricity output port 52 of 90 degree of electric bridges 5 meet double parallel Mach Zeng De respectively
The the first electric drive port 31 and the second electric drive port 32 of modulator 3, the output termination double parallel Mach of bias voltage source 6 was once
The voltage bias port 33 of moral modulator 3, the light output termination light Interleaver 7 of double parallel Mach zehnder modulators 3
Light input end, the first output end 71 and second output terminal 72 of light Interleaver connect the second Polarization Controller 8 respectively
Light input end, 8 light output end of the second Polarization Controller connects the first input end 91 and the second input terminal of polarization beam apparatus 9 respectively
92, the light input end of the light output termination third Polarization Controller 10 of polarization beam apparatus 9, the light output of third Polarization Controller 10
The light input end 111 of phase-modulator 11 is terminated, the light output end 112 of phase-modulator 11 connects the light of the 4th Polarization Controller 13
Input terminal, the voltage bias port 113 of the electricity output termination phase-modulator 11 of bias voltage source 12, the 4th Polarization Controller 13
Light output end connect the light input end of the polarizer 14, the light output end of the polarizer exports triangle light pulse.
Adjust the output voltage V of bias voltage source 6bias, enable Vbias=Vπ=2V, wherein VπFor double parallel Mach once moral tune
The half-wave of device 3 processed converts voltage.Two of double parallel Mach zehnder modulators 3 sub- MZ and mother MZ are offset to maximum respectively
Transfer point, maximum transmitted point, minimum transfer point；
Set index of modulation m=π VRF/2Vπ=4.165, adjust the sinusoidal signal amplitude of 4 output of sine wave local oscillator
VRF=2.825Vπ=5.65V, wherein Vπ=2V is that the half-wave of double parallel Mach zehnder modulators 3 converts voltage；
Adjust polarizer polarization angle α=60 ° of the polarizer；
The output sinusoidal signal frequency f of sine wave local oscillator 4RF=7.5GHz；
The bias voltage source offset Δ V of double parallel MZ Mach-Zehnder 3bias=0.5%；
The extinction ratio ε of the present embodiment modulatorrValue is 30dB, Δ VbiasValue is 0.5%, fRF=7.5GHz, Vπ=
2V, after above-mentioned adjusting, the output of the polarizer 14 is triangle light pulse, repetition rate f=4fRF=30GHz, corresponding time domain
Shown in curve graph 6.
Embodiment three
A kind of optical triangulation shape impulse generator with tunable repetition rate, as shown in Figure 1, it is characterised in that：It should
Triangle generator includes, continuous-wave laser 1, the first Polarization Controller 2, double parallel MZ Mach-Zehnder 3, just
4,90 ° of electric bridges 5 of string wave local oscillator, bias voltage source 6, light Interleaver 7, the second Polarization Controller 8, polarization point
Beam device 9, third Polarization Controller 10, phase-modulator 11, bias voltage source 12, the 4th Polarization Controller 13, the polarizer 14；Tool
Body connection type is：
The light output of continuous-wave laser 1 terminates the input terminal of the first Polarization Controller 2, the first Polarization Controller 2 it is defeated
Go out to terminate the light input end of double parallel MZ Mach-Zehnder 3, the electricity output of sine wave local oscillator 4 terminates 90 degree of electric bridges
5 electrical input, the 90 degree of electricity output ports 51 and 0 degree of electricity output port 52 of 90 degree of electric bridges 5 meet double parallel Mach Zeng De respectively
The the first electric drive port 31 and the second electric drive port 32 of modulator 3, the output termination double parallel Mach of bias voltage source 6 was once
The voltage bias port 33 of moral modulator 3, the light output termination light Interleaver 7 of double parallel Mach zehnder modulators 3
Light input end, the first output end 71 and second output terminal 72 of light Interleaver connect the second Polarization Controller 8 respectively
Light input end, 8 light output end of the second Polarization Controller connects the first input end 91 and the second input terminal of polarization beam apparatus 9 respectively
92, the light input end of the light output termination third Polarization Controller 10 of polarization beam apparatus 9, the light output of third Polarization Controller 10
The light input end 111 of phase-modulator 11 is terminated, the light output end 112 of phase-modulator 11 connects the light of the 4th Polarization Controller 13
Input terminal, the voltage bias port 113 of the electricity output termination phase-modulator 11 of bias voltage source 12, the 4th Polarization Controller 13
Light output end connect the light input end of the polarizer 14, the light output end of the polarizer exports triangle light pulse.
Adjust the output voltage V of bias voltage source 6bias, enable Vbias=Vπ=2V, wherein VπFor double parallel Mach once moral tune
The half-wave of device 3 processed converts voltage.Two of double parallel Mach zehnder modulators 3 sub- MZ and mother MZ are offset to maximum respectively
Transfer point, maximum transmitted point, minimum transfer point；
Set index of modulation m=π VRF/2Vπ=4.165, adjust the sinusoidal signal amplitude of 4 output of sine wave local oscillator
VRF=2.825Vπ=5.65V, wherein Vπ=2V is that the half-wave of double parallel Mach zehnder modulators 3 converts voltage；
Adjust polarizer polarization angle α=60 ° of the polarizer；
The output sinusoidal signal frequency f of sine wave local oscillator 4RF=10GHz；
The bias voltage source offset Δ V of double parallel MZ Mach-Zehnder 3bias=0.5%；
The extinction ratio ε of the present embodiment modulatorrValue is 30dB, Δ VbiasValue is 0.5%, fRF=10GHz, Vπ=2V,
After above-mentioned adjusting, the output of the polarizer 14 is triangle light pulse, repetition rate f=4fRF=20GHz, corresponding time domain are bent
Shown in line chart 7.
Claims (1)
1. a kind of optical triangulation shape impulse generator with tunable repetition rate, it is characterised in that：The triangular pulse is sent out
Raw device includes continuous-wave laser (1), the first Polarization Controller (2), double parallel MZ Mach-Zehnder (3), sine wave sheet
Ground oscillator (4), 90 ° of electric bridges (5), bias voltage source (6), light Interleaver (7), the second Polarization Controller (8), partially
Shake beam splitter (9), third Polarization Controller (10), phase-modulator (11), bias voltage source (12), the 4th Polarization Controller
(13), the polarizer (14)；Specifically connection type is：
The light output of continuous-wave laser (1) terminates the input terminal of the first Polarization Controller (2), the first Polarization Controller (2)
The light input end of output termination double parallel MZ Mach-Zehnder (3), the electricity output termination of sine wave local oscillator (4)
The electrical input of 90 ° of electric bridges (5), the 90 degree of electricity output ports and 0 degree of electricity output port of 90 ° of electric bridges (5) connect double parallel horse respectively
The output of the first electric drive port and the second electric drive port of conspicuous Zeng Deer modulators (3), bias voltage source (6) terminates double flat
The tertiary voltage offset port of row MZ Mach-Zehnder (3), the light output termination of double parallel MZ Mach-Zehnder (3)
The light input end of light Interleaver (7), first output the second Polarization Controller of termination (8) of light Interleaver
Light input end, the light output end of the second Polarization Controller (8) and the second output terminal of light Interleaver connect partially respectively
Shake two input ports of beam splitter (9), the light input of the light output termination third Polarization Controller (10) of polarization beam apparatus (9)
End, the light input end of the light output termination phase-modulator (11) of third Polarization Controller (10), the light of phase-modulator (11)
The light input end of output the 4th Polarization Controller (13) of termination, the electricity output termination phase-modulator (11) of bias voltage source (12)
Voltage bias port, the light output end of the 4th Polarization Controller (13) connects the light input end of the polarizer (14), the light of the polarizer
Output end exports triangle light pulse, and set-up mode is：
Adjust the output voltage V of bias voltage source (6)bias, make Vbias=Vπ, wherein VπFor double parallel MZ Mach-Zehnder
(3) half-wave converts voltage, and 2V≤Vπ≤4V；By two sub- modulators of double parallel MZ Mach-Zehnder (3) and one
A mother's modulator is offset to maximum transmitted point, maximum transmitted point, minimum transfer point respectively；
Set index of modulation m=π VRF/2Vπ=4.165, adjust the sinusoidal signal amplitude V that sine wave local oscillator (4) exportsRF
=2.825Vπ；
Adjust polarizer polarization angle α=60 ° of the polarizer；
The output sinusoidal signal frequency of sine wave local oscillator (4) is fRF, in the range of 1GHz≤fRF≤40GHz；
The bias voltage source offset Δ V of double parallel MZ Mach-Zehnder (3)bias, in the range of -1%≤Δ Vbias≤
0.5%；
By above-mentioned setting, polarizer output is triangle light pulse, repetition rate f=4fRF。
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| CN112496530B (en) * | 2020-11-19 | 2021-10-15 | 中国科学院西安光学精密机械研究所 | V-shaped groove optical fiber cladding laser micro-nano machining method |
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