CN107024781A - A kind of Optical All-pass and microwave photon filter and phase shifter - Google Patents
A kind of Optical All-pass and microwave photon filter and phase shifter Download PDFInfo
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- CN107024781A CN107024781A CN201710187583.7A CN201710187583A CN107024781A CN 107024781 A CN107024781 A CN 107024781A CN 201710187583 A CN201710187583 A CN 201710187583A CN 107024781 A CN107024781 A CN 107024781A
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/0102—Constructional details, not otherwise provided for in this subclass
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/21—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour by interference
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/21—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour by interference
- G02F1/212—Mach-Zehnder type
Abstract
The invention discloses a kind of Optical All-pass, including the first optical coupler, the second optical coupler, the first coupling grating, the second coupling grating, first, second, third, fourth optical phase shifter and micro-loop.The present invention is using the frequency response characteristic of micro-loop, and by two-way amplitude, the signal of phase-adjustable is respectively from two different port feeding micro-loops of micro-loop, and close beam output in the interference of the port of micro-loop 2.The present invention realizes different system phase response spectrum width by changing micro-loop couple state, by the amplitude and phase adjusted to two paths of signals, and it is the constant unrelated with frequency to realize system amplitude response, so as to realize Optical All-pass.On the basis of the Optical All-pass, the invention discloses a kind of high q-factor, the microwave photon filter of superelevation rejection ratio and a kind of operating frequency range are big, and the nonpitting micro-wave light quantum phase shifter of amplitude response in working range.
Description
Technical field
The invention belongs to optical filter and microwave photon technology field, it is related to a kind of integrated optics all-pass filter, and
Microwave photon filter and micro-wave light quantum phase shifter are realized on the basis of the Optical All-pass.
Background technology
Optical All-pass is the phase filter that amplitude response changes for constant, phase response with frequency.By right
Phase is designed accordingly, can be the weight in all-optical signal processing system for construction optical delay line, dispersion compensator etc.
Want device.
Optical All-pass generally has two kinds of structures:Gires-Tournois chambers and micro-loop structure.Wherein Gires-
Tournois chambers coordinate circulator just to realize the function of Optical All-pass, but this structural volume is big, complicated.
Micro-loop small volume is compatible with semiconductor technology, it is possible to use various optical effects, such as thermo-optic effect, electrooptic effect, which are realized, to be adjusted
Section, with it is inherent can integrated advantage, be widely used in manufacturing integrated optical filter.When waveguide loss is ignored not
Timing, the amplitude response perseverance of micro-loop is 1, is considered as preferable all-pass filter.It can be obtained by the cascade of multiple all-pass micro-loops
To the phase response for being similar to any requirement, and then improve the performance of wave filter.But waveguide loss is in actual element manufacturing
It is inevitable, and the resonance characteristic of micro-loop makes the all-pass filter of cascade micro-loop structure extremely sensitive to loss so that
Its amplitude response can not perseverance be constant in whole spectral range, there is a depression filter shape, therefore micro- to simple cascade
The making of the all-pass filter of ring structure brings difficulty.
Microwave photon filter, phase shifter handle microwave signal using optical means and realize filtering, phase shift function
Microwave photon system.Microwave photon filter and phase shifter function can be realized using the phase filtering characteristic of all-pass filter.
But the phase filtering bandwidth of the all-pass filter based on cascade micro-loop is very big (to be referred to and is just realized in very wide frequency range from 0 change
To 2 π phase place change), big bandwidth limits the bandwidth of constructed microwave photon filter, also limit microwave photon phase shift
The working range of device, and due to the amplitude presence depression at resonance point, unwanted amplitude is introduced while phase shift and is become
Change.Therefore the bandwidth of the microwave photon filter based on cascade micro-loop all-pass filter construction can not accomplish sufficiently narrow, based on level
The phase shifter operating frequency range of connection micro-loop all-pass filter is restricted, and introduces unwanted changes in amplitude.
The content of the invention
For the disadvantages described above or Improvement requirement of prior art, the invention provides a kind of Optical All-pass, in the hope of
Obtain narrow phase filtering bandwidth, make phase near resonance point it is fast-changing simultaneously, and then obtain in whole spectral region
Amplitude response is constant and the Optical All-pass of depression is not present.
To achieve these goals, the present invention provides a kind of Optical All-pass, including the first optical coupler, second
Optical coupler, the first optical phase shifter, the second optical phase shifter, the 3rd optical phase shifter and micro-loop；Wherein：
First optical coupler using 1 × 2 optical splitter (optical splitter can be, but not limited to be multi-mode interference coupler or
Y-branch coupler), the second optical coupler can be, but not limited to use 2 × 2 multi-mode interference couplers；
The first optical coupler output end upper arm is connected by waveguide with the input upper arm of the second optical coupler,
Its output end underarm is connected by waveguide with the input underarm of the second optical coupler, and the waveguide of two underarms of connection is provided with first
Optical phase shifter, for changing the waveguide transmission signal phase；
The micro-loop has four ports, is first port (10), second port (11), the 3rd port (12) and the 4th respectively
Port (13)；
The second optical coupler output end upper arm is connected by waveguide with micro-loop first port (10), the waveguide design
For bending to keep identical with underarm waveguide length, and provided with the second optical phase shifter, for changing waveguide transmission signal phase
Position；The second optical coupler output end underarm is connected by waveguide with the port (12) of micro-loop the 3rd, waveguide length and upper arm
Waveguide is identical, so that the signal for entering micro-loop from two ports keeps phase identical；The waveguide is provided with the 3rd optical phase shifter,
For further changing waveguide transmission signal phase；
Described Optical All-pass also includes the first coupling grating and the second coupling grating；First coupling grating
It is connected as input with the input of the first optical coupler, is used as the input of Optical All-pass；Second coupling
Closing light grid are connected with micro-loop second port, are used as the output end of Optical All-pass；
In work, the first optical coupler and the second optical coupler input together form with the first optical phase shifter
MZI structures；Signal phase by the waveguide is adjusted by the first optical phase shifter, and realized by the MZI constructive interferences
Amplitude regulates and controls, so as to change the splitting ratio of micro-loop first port (10) and the 3rd port (12) two-way input signal；Pass through regulation
Second, third optical phase shifter (5,6) realizes first port input signal and the regulation and control of second port input signal phase difference, makes micro-
Ring first port is identical with the phase of the 3rd port input signal；Two paths of signals after amplitude, phase regulation and control is respectively from micro-
Ring first port enters micro-loop with the 3rd port, wherein the optical signal inputted from first port is output as band in second port and falls into shape
Shape, the optical signal inputted from the 3rd port is output as bandpass shape in second port, the two ways of optical signals in micro-loop second
Port (11) interference output, and then amplitude response is obtained for constant, there are 2 π phase shifts near micro-ring resonant frequency in phase response
Optical All-pass.The corresponding bandwidth of 2 π phase shifts is general in the 1GHz centered on resonant frequency.The present invention is proposed
Optical All-pass, the mesh of narrow bandwidth can be realized by changing the coupling spacing between micro-loop and up and down straight wave guide
's；It is constant to realize amplitude response by amplitude adjusted to two paths of signals (in regulation MZI structures optical phase shifter to realize)
Nonpitting purpose.
Further, the wave filter can use but be not limited to following material system：SOI bases, organic polymer, nitrogen
SiClx, silicon oxynitride, silica and silica etc..
Further, the wave filter can use but be not limited to following waveguiding structure：Bar waveguide, ridge waveguide, slit
Waveguide and surface plasma waveguide etc..
Further, the wave filter can use but be not limited to the specific methods such as heating electrode, PN junction, luminous power to change
Become the phase of signal in waveguide.
Based on above-mentioned Optical All-pass, the present invention also proposes a kind of microwave photon band resistance-trap filter, in addition to laser
Device, the first Polarization Controller, modulator, the second Polarization Controller and photodetector；Wherein：The laser is used to launch
Continuous light is used as light carrier；First Polarization Controller is connected with laser, for adjusting light carrier polarization state；The modulation
Device carrier input is connected with the first Polarization Controller；Second Polarization Controller is connected with modulator output end, for adjusting
Save the polarization state of signal after modulated device modulation；The Optical All-pass input and the second Polarization Controller output end phase
Even；The photodetector is connected with optics all-pass wave filtering output end, for output optical signal to be converted into electric signal；It is described to adjust
Device processed is intensity modulator, for being modulated to the light carrier after polarization state is adjusted, and it produces amplitude, phase identical
Single order upper side band and lower sideband, realize microwave signal to the conversion of optical signal；The Optical All-pass, which is used to handle, modulates
Upper and lower sideband optical signal afterwards, while keeping upper and lower sideband amplitude identical, phase is introduced to upper side band set specific frequency signal
Move, upper and lower sideband is only there is π phase differences at resonance point, and same phase is kept in other frequencies；The specific frequency is with carrying
The difference of wave frequency rate is microwave photon filter centre frequency；The photodetector is made at beat frequency to Optical All-pass output
Reason, optical signal is converted to microwave telecommunication number and falls into filtering in resonance point formation band, realizes microwave photon band resistance-trap filter.
Based on above-mentioned Optical All-pass, the present invention also proposes a kind of microwave photon bandpass filter, including laser,
First Polarization Controller, modulator, the second Polarization Controller and photodetector；Wherein：The laser is used to launch and connected
Continuous light is used as light carrier；First Polarization Controller is connected with laser, for adjusting light carrier polarization state；The modulator
Carrier input is connected with the first Polarization Controller；Second Polarization Controller is connected with modulator output end, for adjusting
The polarization state of signal after modulated device modulation；The Optical All-pass input and the second Polarization Controller output end phase
Even；The photodetector is connected with optics all-pass wave filtering output end, for output optical signal to be converted into electric signal；It is described to adjust
Device processed is phase-modulator, for being modulated to the light carrier after polarization state is adjusted, and generation amplitude is identical, opposite in phase
Single order upper side band and single order lower sideband, realize microwave signal to the conversion of optical signal；The Optical All-pass is used to locate
Optical signal after reason modulation, it is specific to upper side band while the upper and lower sideband amplitude produced after keeping modulators modulate is identical
Frequency signal introduces phase shift, makes upper and lower sideband only in the same phase of resonance point, and keeps anti-phase in other frequencies；The photoelectricity is visited
Surveying device is used to make beat frequency processing to Optical All-pass output, optical signal is converted to microwave telecommunication number and is formed in resonance point
Bandpass filtering, realizes microwave photon bandpass filter.
Further, described microwave photon filter, can be by the 4th optical phase shift of the all-pass optical filter
Device changes the resonant frequency of micro-loop, to adjust the difference on the frequency between resonant frequency and light carrier, realizes the filtering of the wave filter
Regulable center frequency.
Based on above-mentioned Optical All-pass, the present invention also proposes a kind of micro-wave light quantum phase shifter, including laser, first
Polarization Controller, single sideband modulation module, the second Polarization Controller and photodetector；Wherein：The single sideband modulation module
Optical band pass filter or electric orthogonal mixer combination dual drive Mach-Zehnder modulators composition can be joined for modulator stage,
Its carrier input is connected with the first Polarization Controller；Single sideband modulation module modulation termination microwave input signal, for will be micro-
Ripple signal loading realizes microwave signal to the conversion of optical signal to single sideband modulation is realized on light carrier；The laser is used for
Launch continuous light as light carrier；First Polarization Controller is connected with laser, for being polarized to the light carrier
State is adjusted；Second Polarization Controller is connected with single sideband modulation module output end, for the inclined of single sideband modulated signal
Polarization state is adjusted；The Optical All-pass is connected with the second Polarization Controller output end；The photodetector and light
All-pass filter output end is learned to be connected；The Optical All-pass is used to handle single sideband modulated signal, is not introducing signal
Amplitude jitter and while keep upper side band phase invariant, by the diverse location being arranged on carrier wave near resonant frequency,
Different phase shifts are introduced to carrier wave；The photodetector is used for Optical All-pass output signal beat frequency, is converted
For microwave telecommunication number；Because Optical All-pass does not introduce amplitude jitter, and phase shift is introduced to carrier wave, obtain the carrier wave of phase shift
With the upper side band beat frequency of phase invariant, so that microwave signal phase changes with the phase-shift phase that carrier wave is introduced, realize micro-
Ripple quantum phase shifter.
Further, described micro-wave light quantum phase shifter, can be at optics all-pass by adjusting the wavelength of light carrier
The different position in wave filter phase shifting region, so as to introduce different phase shifts；Or the humorous of micro-loop is changed by the 4th optical phase shifter
Vibration frequency, to adjust the phase shift that Optical All-pass is introduced in carrier frequency, realizes the phase of the micro-wave light quantum phase shifter
Shifting amount is adjustable.
Further, the microwave photon filter and the micro-wave light quantum phase shifter, can be by outside laser, modulation
Device is collectively integrated on chip with detector, realizes single-chip integration, reduces device size, is increased stability, is reduced cost.
In general, by the contemplated above technical scheme of the present invention compared with prior art, it can obtain down and show
Beneficial effect：
(1) Optical All-pass that the present invention is provided, passes through defeated from different port after amplitude, phase adjusted due to using
Enter micro-loop and 2 ports interfere output structure, compared with prior art, by the amplitude of accommodation rather than reduction waveguide loss come
All-pass filter is realized, the problem of cascade micro-loop all-pass filter is difficult to make to waveguide loss sensitivity is solved, it is possible to achieve
Amplitude response is constant without depression in whole Free Spectral Range.Wherein, spacing is coupled by changing micro-loop, thus it is possible to vary system
Phase filtering spectrum width, so that real narrow bandwidth or the phase filtering spectrum width required for other.
(2) high q-factor that the present invention is provided, the microwave photon filter of superelevation rejection ratio, due to all-pass wave filtering can be being made
Realize that weak-coupling state obtains the all-pass filter of arrowband phase filtering by changing micro-loop coupling spacing during device, thus constitute
Microwave photon filter narrower bandwidth has good frequency selectivity, and due to the method using interference cancellation, in arrowband
There is superelevation rejection ratio while wide, the filtering performance of microwave photon filter is improved.
(3) operating frequency range that provides of the present invention is big, and in working range amplitude response non-jitter microwave photon
Phase shifter, because all-pass filter amplitude response is constant, therefore will not introduce while different phase shifts are realized amplitude jitter,
And extra filter shape will not be brought.Because all-pass filter is narrow bandwidth phase filter, therefore compared to traditional base
In the phase shifter of micro-loop, it can realize the phase shift to more lower frequency microwave signals, improve the operating frequency range of phase shifter.
(4) Optical All-pass that the present invention is provided, the tuning of wave filter is realized by the optical phase shifter in micro-loop
Property；Change the resonance wavelength of micro-loop using thermo-optic effect, carrier injecting principle or luminous power principle, so that optics all-pass is filtered
The regulable center frequency of ripple device phase filtering.Thus, realized based on the microwave photon filter that the Optical All-pass is constructed
Filter center frequency is adjustable, and that micro-wave light quantum phase shifter realizes phase-shift phase is adjustable.
Brief description of the drawings
The structural representation for the Optical All-pass that Fig. 1 provides for the present invention；
Fig. 2 is micro-loop cellular construction schematic diagram.
The Optical All-pass simulation result that Fig. 3 provides for the present invention；
Structural representation of the microwave photon with resistance-trap filter that Fig. 4 provides for the present invention；
Principle schematic of the microwave photon with resistance-trap filter that Fig. 5 provides for invention；
Simulation result of the microwave photon with resistance-trap filter that Fig. 6 provides for invention；
The structural representation for the micro-wave light quantum phase shifter device that Fig. 7 provides for the present invention；
The principle schematic for the micro-wave light quantum phase shifter that Fig. 8 provides for invention；
The micro-wave light quantum phase shifter phase response simulation result that Fig. 9 provides for invention.
The micro-wave light quantum phase shifter amplitude response simulation result that Figure 10 provides for invention
In all of the figs, identical reference is used for representing identical element or structure, wherein：1- first couples light
Grid, the optical couplers of 2- first, the optical phase shifters of 3- first, the optical couplers of 4- second, the optical phase shifters of 5- second, 6- the 3rd
Optical phase shifter, the optical phase shifters of 7- the 4th, 8- micro-loops, the coupling gratings of 9- second.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.As long as in addition, technical characteristic involved in each embodiment of invention described below
Not constituting conflict each other can just be mutually combined.
Technical scheme is further described in detail with reference to the accompanying drawings and detailed description.
The structural representation of Optical All-pass as shown in Figure 1, including 1 × 2 optical coupler, 2 × 2 light
Learn coupler, a micro-loop and multiple optical phase shifters；Wherein, the first optical coupler, the input of the second optical coupler
MZI structures are constituted together with the first optical phase shifter；
Micro-loop as shown in Figure 2 has four ports to be 1 port (10), 2 ports (11), 3 ports (12) and 4 ports respectively
(13)；
The operation principle of the Optical All-pass is to realize that amplitude regulates and controls by adjusting the first optical phase shifter in MZI,
Change the port of micro-loop 1 (10) and the splitting ratio of 3 ports (12) input signal；By adjust second, third optical phase shifter make it is micro-
The port of ring 1 is identical with the phase of 3 port input signals；Two paths of signals after amplitude, phase regulation and control is respectively from the port of micro-loop 1
Enter micro-loop with 3 ports, micro-loop therein realizes required phase filtering spectrum width when making by changing coupling spacing.
Interfere output after micro-loop is handled in 2 ports (11) two ways of optical signals of micro-loop, it is constant purpose to realize amplitude response, is obtained
Phase response changes with frequency, i.e., the Optical All-pass that there are 2 π phase shifts in the range of micro-ring resonant frequency 1GHz.
Fig. 3 is the simulation result of Optical All-pass, it can be seen that the optical signal from the input of the port of micro-loop 1 is in 2 ports
It is output as band and falls into shape, the optical signal inputted from 3 ports in 2 ports is output as bandpass shape, the two-way letter by amplitude adjusted
Beam interferometer, which is closed, in 2 ports number after micro-loop is handled and then amplitude response is realized does not change the amplitude for not showing as constant with frequency
Response curve；And 2 port output signal phase in the range of resonant frequency 1GHz exist 2 π phase shifts.
Fig. 4 is structural representation of the microwave photon based on Optical All-pass of the present invention with resistance-trap filter, including is swashed
Light device, the first Polarization Controller, modulator, the second Polarization Controller, Optical All-pass, radiofrequency signal dual-mode antenna and
Photodetector；
First polarization beat length device is connected with semiconductor laser；Modulator carrier input and the first Polarization Controller phase
Even；Second Polarization Controller is connected with modulator output end；Optical All-pass is connected with the second Polarization Controller；Photoelectricity is visited
Survey device and be connected with learning all-pass wave filtering.
Principle schematic of the microwave photon with resistance-trap filter as shown in Figure 5, the continuous light conduct of semiconductor laser
Light carrier is modulated by intensity modulator, produces amplitude, phase identical single order upper side band and lower sideband；Optical All-pass pair
Optical signal after modulation is handled, and such as amplitude response of figure all-pass filter passes through not change flat straight line with frequency
Cross upper and lower sideband amplitude after all-pass filter and keep equal, and the phase shift that signal upper side band is introduced due to all-pass filter, upper,
Only there is π phase differences in resonance point in lower sideband；By photodetector beat frequency, optical signal is converted to microwave telecommunication number and humorous
A formation band that shakes falls into filtering, realizes microwave photon band resistance-trap filter.
In addition, changing the resonant frequency of micro-loop by the 4th optical phase shifter, carried with adjusting resonant frequency with light
Difference on the frequency between ripple, realizes that filter center frequency of the microwave photon with resistance-trap filter is adjustable.
If Fig. 6 is simulation result of the microwave photon with resistance-trap filter, it can be seen that the wave filter realizes centre frequency
It is adjustable, and due to the phase filtering narrower bandwidth of all-pass filter, the microwave photon filter has the bandwidth less than 1GHz, by
In the method for employing interference cancellation, with the rejection ratio more than 70dB.
Fig. 7 be the micro-wave light quantum phase shifter based on Optical All-pass of the present invention structural representation, including laser,
First Polarization Controller, single sideband modulation module, the second Polarization Controller, the Optical All-pass and photodetection
Device；Wherein, single sideband modulation module can be cascaded optical band pass filter or electric orthogonal mixer combination dual drive horse by modulator
Conspicuous Zeng Deer modulators composition；
First Polarization Controller is connected with semiconductor laser；Single sideband modulation module carrier input and the first polarization are controlled
Device processed is connected；Second Polarization Controller is connected with single sideband modulation module output end；Optical All-pass is controlled with the second polarization
Device processed is connected；Photodetector is connected with optics all-pass wave filtering.
The principle schematic of the micro-wave light quantum phase shifter as shown in Figure 8, is cascaded by single sideband modulation module, i.e. modulator
Optical band pass filter or electric orthogonal mixer combination dual drive MZ Mach-Zehnder obtain single sideband modulated signal, realize
Conversion of the microwave signal to optical signal.Optical All-pass is handled single sideband modulated signal, such as figure all-pass filter
Amplitude response not change flat straight line with frequency, therefore do not introduce signal amplitude shake.And upper side band is in off resonance
Position phase invariant, and carrier wave is arranged near resonant frequency and is introduced into phase shift.By photodetector, carrier wave and the phase of phase shift
The upper side band beat frequency of invariant position, optical signal is converted to microwave telecommunication number, so that the phase that microwave signal phase is introduced with carrier wave
Shifting amount and change, realize micro-wave light quantum phase shifter.
In addition, the wavelength by adjusting light carrier, be located at the different position in Optical All-pass phase shifting region from
And different phase shifts are introduced, or the resonant frequency of micro-loop is changed by the 4th optical phase shifter, to adjust optics all-pass
The phase shift that wave filter is introduced in carrier frequency, realizes that the phase-shift phase of the micro-wave light quantum phase shifter is adjustable.
Such as the simulation result that Fig. 9 is the micro-wave light quantum phase shifter phase response, it can be seen that by the way that carrier wave is set respectively
In different positions, the phase shifter realizes different degrees of phase shift to microwave signal.And because the phase of all-pass filter is filtered
Ripple narrower bandwidth so that the microwave signal of low frequency can also obtain good phase shift, improves the working range of phase shifter.As schemed
10 be the simulation result of the micro-wave light quantum phase shifter amplitude response, amplitude of phase shifter while phase shift is realized to signal
The insertion loss of an entirety is introduced, its amplitude response is constant, and extra filter shape is not brought.And carrier wave is set respectively
Put when realizing different phase shifts in different positions, its amplitude is always consistent, each bar curves overlapped has same together
Insertion loss, it is achieved that amplitude keeps constant during different phase-shift phases.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, it is not used to
The limitation present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the invention etc., it all should include
Within protection scope of the present invention.
Claims (10)
1. a kind of Optical All-pass, it is characterised in that including the first optical coupler (2), the second optical coupler (4),
First optical phase shifter (3), the second optical phase shifter (5), the 3rd optical phase shifter (6) and micro-loop (8)；Wherein：
First optical coupler (can be, but not limited to be multi-mode interference coupler or Y-branch coupling using 1 × 2 optical splitter
Device), the second optical coupler can use but be not limited to 2 × 2 multi-mode interference couplers；
The first optical coupler output end upper arm is connected by waveguide with the input upper arm of the second optical coupler, and its is defeated
Go out to hold underarm to be connected by waveguide with the input underarm of the second optical coupler, the waveguide of two underarms of connection is provided with the first optics
Phase-shifter (3), for changing the waveguide transmission signal phase；
The micro-loop has four ports, is first port (10), second port (11), the 3rd port (12) and the 4th port respectively
(13)；
The second optical coupler output end upper arm is connected by waveguide with micro-loop first port (10), and the waveguide design is curved
It is curved identical with underarm waveguide length with holding, and provided with the second optical phase shifter (5), for changing waveguide transmission signal phase
Position；The second optical coupler output end underarm is connected by waveguide with the port (12) of micro-loop the 3rd, waveguide length and upper arm
Waveguide is identical, so that the signal for entering micro-loop from two ports keeps phase identical；The waveguide is provided with the 3rd optical phase shifter
(6), for changing waveguide transmission signal phase；
The input of first optical coupler is connected, and is used as the input of Optical All-pass；The end of micro-loop second
Mouthful as Optical All-pass output end；
In work, the first optical coupler and the second optical coupler input and the first optical phase shifter together form MZI
(Mach-Zehnder interferometer, Mach-Zehnder interferometers) structure；Passed through by the regulation of the first optical phase shifter
The signal phase of the waveguide, and by the MZI constructive interferences realize amplitude regulate and control so that change micro-loop first port (10) with
The splitting ratio of the 3rd port (12) two-way input signal；First port is adjusted by second, third optical phase shifter (5,6) to input
Signal and second port input signal phase difference, make micro-loop first port identical with the phase of the 3rd port input signal；By
Two paths of signals after amplitude, phase regulation and control enters micro-loop, the two ways of optical signals from micro-loop first port and the 3rd port respectively
Interfere output in the second port (11) of micro-loop, and then obtain amplitude response for constant, phase response is attached in micro-ring resonant frequency
The nearly Optical All-pass that there are 2 π phase shifts；By changing the micro-loop and the spacing above and below it between two straight wave guides, realize
The adjustment of spacing is coupled, so as to obtain required phase filtering spectrum width.
2. Optical All-pass as claimed in claim 1, it is characterised in that first optical phase shifter (3), the second light
Phase-shifter (5), the 3rd optical phase shifter (6) and the 4th optical phase shifter (7) are learned using heating electrode, PN junction or luminous power structure etc.
To realize.
3. Optical All-pass as claimed in claim 1, it is characterised in that also including the first coupling grating (1) and second
Coupling grating (9)；
First coupling grating is connected as input with the input of the first optical coupler, is used as Optical All-pass
Input；
Second coupling grating is connected with micro-loop second port, is used as the output end of Optical All-pass.
4. Optical All-pass as claimed in claim 1, it is characterised in that the wave filter can be used but is not limited to
Following material system：SOI bases, organic polymer, silicon nitride, silicon oxynitride, silica and silica etc.；The wave filter can
To use but be not limited to following waveguiding structure：Bar waveguide, ridge waveguide, narrow slit wave-guide and surface plasma waveguide etc..
5. a kind of microwave photon band resistance-trap filter based on Optical All-pass described in claim 1, it is characterised in that also wrap
Include laser, the first Polarization Controller, modulator, the second Polarization Controller and photodetector；Wherein：
The laser is used to launch continuous light as light carrier；First Polarization Controller is connected with laser, for adjusting
Save light carrier polarization state；The modulator carrier input is connected with the first Polarization Controller；Second Polarization Controller with
Modulator output end is connected, the polarization state for adjusting signal after modulated device modulation；The Optical All-pass input
It is connected with the second Polarization Controller output end；The photodetector is connected with optics all-pass wave filtering output end, for that will export
Optical signal is converted to electric signal；
The modulator is intensity modulator, for being modulated to the light carrier after polarization state is adjusted, its generation amplitude,
Phase identical single order upper side band and lower sideband, realize microwave signal to the conversion of optical signal；
The Optical All-pass is used to handle the upper and lower sideband optical signal after modulation, and keeping, upper and lower sideband amplitude is identical
While, phase shift is introduced to upper side band set specific frequency signal, upper and lower sideband is only there is π phase differences at resonance point, and
Other frequencies keep same phase；The difference of the specific frequency and carrier frequency is microwave photon filter centre frequency；
The photodetector makees beat frequency processing to Optical All-pass output, and optical signal is converted to microwave telecommunication number and humorous
A formation band that shakes falls into filtering, realizes microwave photon band resistance-trap filter.
6. a kind of microwave photon bandpass filter based on Optical All-pass described in claim 1, it is characterised in that also wrap
Include laser, the first Polarization Controller, modulator, the second Polarization Controller and photodetector；Wherein：
The laser is used to launch continuous light as light carrier；First Polarization Controller is connected with laser, for adjusting
Save light carrier polarization state；The modulator carrier input is connected with the first Polarization Controller；Second Polarization Controller with
Modulator output end is connected, the polarization state for adjusting signal after modulated device modulation；The Optical All-pass input
It is connected with the second Polarization Controller output end；The photodetector is connected with optics all-pass wave filtering output end, for that will export
Optical signal is converted to electric signal；
The modulator is phase-modulator, for being modulated to the light carrier after polarization state is adjusted, and produces amplitude phase
Same, the single order upper side band and single order lower sideband of opposite in phase, realize microwave signal to the conversion of optical signal；
The Optical All-pass is used to handle the optical signal after modulation, the upper and lower side produced after modulators modulate is kept
While band amplitude is identical, phase shift is introduced to upper side band set specific frequency signal, makes upper and lower sideband only in the same phase of resonance point, and
Keep anti-phase in other frequencies；
The photodetector is used to make beat frequency processing to Optical All-pass output, optical signal is converted to microwave telecommunication number
And in resonance point formation bandpass filtering, realize microwave photon bandpass filter.
7. the wave filter as described in claim 5 or 6, it is characterised in that be provided with the 4th optics in the all-pass optical filter
Phase-shifter, the resonant frequency for changing micro-loop, to adjust the difference on the frequency between resonant frequency and light carrier, realizes the filtering
The filter center frequency of device is adjustable.
8. a kind of micro-wave light quantum phase shifter based on Optical All-pass described in claim 1, it is characterised in that also including swashing
Light device, the first Polarization Controller, single sideband modulation module, the second Polarization Controller and photodetector；Wherein：
The single sideband modulation module be modulator cascade optical band pass filter or electric orthogonal mixer combination dual drive Mach-
Zeng Deer modulators are constituted, and its carrier input is connected with the first Polarization Controller；Single sideband modulation module modulation termination microwave
Input signal, single sideband modulation is realized for microwave signal to be loaded on light carrier, realizes microwave signal turning to optical signal
Change；
The laser is used to launch continuous light as light carrier；First Polarization Controller is connected with laser, for pair
The light carrier carries out polarization state adjustment；Second Polarization Controller is connected with single sideband modulation module output end, for pair
The polarization state of single sideband modulated signal is adjusted；The Optical All-pass is connected with the second Polarization Controller output end；
The photodetector is connected with Optical All-pass output end；
The Optical All-pass is used to handle single sideband modulated signal, is shaken and in holding not introducing signal amplitude
While side band phase is constant, by diverse location carrier wave being arranged near resonant frequency, different phases are introduced to carrier wave
Move；
The photodetector is used for Optical All-pass output signal beat frequency, is converted into microwave telecommunication number；Due to
Optical All-pass does not introduce amplitude jitter, and introduces phase shift to carrier wave, obtains the carrier wave of phase shift and the top of phase invariant
Band beat frequency, so that microwave signal phase changes with the phase-shift phase that carrier wave is introduced, realizes micro-wave light quantum phase shifter.
9. micro-wave light quantum phase shifter as claimed in claim 8, it is characterised in that by adjusting the wavelength of light carrier, make at it
In the different position in Optical All-pass phase shifting region, so as to introduce different phase shifts；Or by the 4th optical phase shifter come
Change the resonant frequency of micro-loop, to adjust the phase shift that Optical All-pass is introduced in carrier frequency, realize the microwave light
The phase-shift phase of sub- phase shifter is adjustable.
10. the micro-wave light quantum phase shifter as described in microwave photon filter and claim 8,9 as described in claim 5 or 6, its
It is characterised by, outside laser, modulator and detector can be collectively integrated on chip, realize single-chip integration, reduce device
Part size, increases stability, reduces cost.
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| CN111929927A (en) * | 2020-08-27 | 2020-11-13 | 北京科技大学 | Micro-ring phase shifter with inner surrounding type micro-heater |
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| CN107589415A (en) * | 2017-09-06 | 2018-01-16 | 南京航空航天大学 | Microwave photon wideband radar imager chip, system |
| CN108873175A (en) * | 2018-06-01 | 2018-11-23 | 广东工业大学 | A kind of optical band pass filter based on single fiber coupled surface nanometer axial direction photon structure microcavity |
| CN108873175B (en) * | 2018-06-01 | 2020-09-29 | 广东工业大学 | Optical band-pass filter based on single optical fiber coupling surface nano axial photon structure microcavity |
| CN109946514A (en) * | 2019-03-01 | 2019-06-28 | 昆明理工大学 | A kind of optical microwave photon filtering chip, microwave frequency measuring system and method |
| CN111929927A (en) * | 2020-08-27 | 2020-11-13 | 北京科技大学 | Micro-ring phase shifter with inner surrounding type micro-heater |
| CN111929927B (en) * | 2020-08-27 | 2023-01-17 | 北京科技大学 | Micro-ring phase shifter with inner surrounding type micro-heater |
| CN113691315A (en) * | 2021-08-24 | 2021-11-23 | 华中科技大学 | Reconfigurable integrated microwave photon band-pass filter |
| CN113900282A (en) * | 2021-10-12 | 2022-01-07 | 北京理工大学 | Silicon-based integrated broadband high-speed tunable microwave photon phase shifter chip |
| CN113991266A (en) * | 2021-10-12 | 2022-01-28 | 北京理工大学 | Broadband microwave photon phase shifter with constant output power |
| CN113900282B (en) * | 2021-10-12 | 2023-09-19 | 北京理工大学 | Silicon-based integrated broadband high-speed tunable microwave photon phase shifter chip |
| CN114527535A (en) * | 2022-01-13 | 2022-05-24 | 之江实验室 | High-linearity silicon-based modulator chip based on electro-optical predistorter and high-linearity method |
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