CN107024781B - 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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- CN107024781B CN107024781B CN201710187583.7A CN201710187583A CN107024781B CN 107024781 B CN107024781 B CN 107024781B CN 201710187583 A CN201710187583 A CN 201710187583A CN 107024781 B CN107024781 B CN 107024781B
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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
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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
- 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, the first, second, third, fourth optical phase shifter and micro-loop.The present invention utilizes the frequency response characteristic of micro-loop, and by two-way amplitude, the signal of phase-adjustable is sent into micro-loop from two different ports of micro-loop respectively, and interferes in 2 port of micro-loop and close beam output.The present invention realizes different system phase response spectrum width by changing micro-loop couple state, is adjusted by the amplitude and phase to two paths of signals, and realization system amplitude response is the constant unrelated with frequency, to realize Optical All-pass.On the basis of the Optical All-pass, the invention discloses a kind of high q-factor, superelevation inhibits the microwave photon filter of ratio and a kind of operating frequency range big, and the nonpitting micro-wave light quantum phase shifter of amplitude response in working range.
Description
Technical field
The invention belongs to optical filters and microwave photon technology field, are 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 technique
Optical All-pass is that amplitude response is constant, phase response phase filter varying with frequency.By right
Phase is designed accordingly, can be used to construct optical delay line, dispersion compensator etc., is the weight in all-optical signal processing system
Want device.
Usually there are two types of structures for Optical All-pass: Gires-Tournois chamber and micro-loop structure.Wherein Gires-
Tournois chamber cooperation circulator can realize the function of Optical All-pass, but this structural volume is big, and structure is complicated.
Micro-loop is small in size, with semiconductor technology compatibility, can use various optical effects, such as thermo-optic effect, electrooptic effect realization tune
Section has the inherent optical filter for integrating advantage, being widely used in manufacturing integrated.When waveguide loss is ignored not
Timing, the amplitude response perseverance of micro-loop are 1, are considered as ideal 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 filter.But waveguide loss is in actual element manufacturing
It is inevitable, and the resonance characteristic of micro-loop keeps the all-pass filter for cascading micro-loop structure extremely sensitive to loss, so that
Its amplitude response cannot it is permanent in entire spectral range be constant, there are a recess filter shape, therefore micro- to simple cascade
The production 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 may be implemented 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 the phase change of 2 π), big bandwidth limits the bandwidth of constructed microwave photon filter, also limits microwave photon phase shift
The working range of device, and due to the amplitude presence recess at resonance point, unwanted amplitude is introduced while phase shift to be become
Change.Therefore based on cascade micro-loop all-pass filter construction microwave photon filter bandwidth can not accomplish it is sufficiently narrow, be based on grade
The phase shifter operating frequency range of connection micro-loop all-pass filter is restricted, and introduces unwanted amplitude variation.
Summary of the invention
Aiming at the above defects or improvement requirements of the prior art, the present 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 entire spectral region
Amplitude response is constant and there is no the Optical All-pass of recess.
To achieve the goals above, 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, third 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 using 2 × 2 multi-mode interference couplers；
The first optical coupler output end upper arm is connected by waveguide with the input terminal upper arm of the second optical coupler,
Its output end lower arm is connected by waveguide with the input terminal lower arm of the second optical coupler, and the waveguide of two lower arms of connection is equipped with first
Optical phase shifter, for changing the waveguide transmission signal phase；
There are four ports for the micro-loop, are first port (10), second port (11), third 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
It is bending to keep identical as lower arm waveguide length, and is equipped with the second optical phase shifter, for changing waveguide transmission signal phase
Position；The second optical coupler output end lower arm is connected by waveguide with micro-loop third port (12), waveguide length and upper arm
Waveguide is identical, so that the signal for entering micro-loop from two ports be made to keep phase identical；The waveguide is equipped with third optical phase shifter,
For further changing waveguide transmission signal phase；
The Optical All-pass further includes the first coupling grating and the second coupling grating；First coupling grating
It is connected as input terminal with the input terminal of the first optical coupler, the input terminal as Optical All-pass；Second coupling
Light combination grid are connected with micro-loop second port, the output end as Optical All-pass；
In work, the first optical coupler and the second optical coupler input terminal are together formed with the first optical phase shifter
MZI structure；The signal phase for passing through the waveguide is adjusted by the first optical phase shifter, and is realized by the MZI constructive interference
Amplitude regulation, to change the splitting ratio of micro-loop first port (10) Yu third port (12) two-way input signal；Pass through adjusting
Second, third optical phase shifter (5,6) realizes first port input signal and the regulation of second port input signal phase difference, makes micro-
Ring first port is identical as the phase of third port input signal；Two paths of signals after amplitude, phase regulation is respectively from micro-
Ring first port and third port enter micro-loop, wherein the optical signal inputted from first port falls into shape in second port output for band
Shape, from third port input optical signal second port output be bandpass shape, the two ways of optical signals in micro-loop second
Port (11) interference output, and then obtaining amplitude response is constant, there are 2 π phase shifts near micro-ring resonant frequency for phase response
Optical All-pass.The corresponding bandwidth of 2 π phase shift is generally in the 1GHz centered on resonance frequency.The present invention proposes
Optical All-pass, can be by the mesh that changes the coupling spacing between micro-loop and upper and lower straight wave guide to realize realization narrow bandwidth
's；It is constant by amplitude adjusted to two paths of signals (to adjust in MZI structure optical phase shifter to realize) realizations amplitude response
Nonpitting purpose.
Further, the filter may be employed without limitation of following material system: SOI base, organic polymer, nitrogen
SiClx, silicon oxynitride, silica and silica etc..
Further, the filter may be employed without limitation of following waveguiding structure: waveguide, ridge waveguide, slit
Waveguide and surface plasma waveguide etc..
Further, the filter may be employed without limitation of 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, it further includes laser that the present invention, which also proposes a kind of microwave photon band resistance-trap filter,
Device, the first Polarization Controller, modulator, the second Polarization Controller and photodetector；Wherein: the laser is for emitting
Continuous light is 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 is modulated；The Optical All-pass input terminal 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 to electric signal；The tune
Device processed is intensity modulator, and for being modulated to by polarization state light carrier adjusted, it is identical to generate amplitude, phase
Single order upper side band and lower sideband realize the conversion of microwave signal to optical signal；The Optical All-pass is for handling modulation
Upper and lower sideband optical signal afterwards introduces phase to upper side band set specific frequency signal while keeping upper and lower sideband amplitude identical
It moves, making upper and lower sideband, only there are π phase differences at resonance point, and keep same phase in other frequencies；The specific frequency and load
The difference of wave frequency rate is microwave photon filter centre frequency；The photodetector makees at beat frequency Optical All-pass output
Reason, optical signal, which is converted to microwave telecommunication number and forms band in resonance point, falls into filtering, 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 connects for emitting
Continue light 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 terminal 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 to electric signal；The tune
Device processed is phase-modulator, and for generating to being modulated by polarization state light carrier adjusted, amplitude is identical, opposite in phase
Single order upper side band and single order lower sideband, realize microwave signal to optical signal conversion；The Optical All-pass is for locating
Modulated optical signal is managed, it is specific to upper side band while the upper and lower sideband amplitude generated 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 reverse phase in other frequencies；The photoelectricity is visited
It surveys device to be used to make beat frequency processing to Optical All-pass output, optical signal is made to be converted to microwave telecommunication number and be formed in resonance point
Bandpass filtering realizes microwave photon bandpass filter.
Further, the microwave photon filter can pass through the 4th optical phase shift of the all-pass optical filter
The resonance frequency that device changes micro-loop realizes the filtering of the filter to adjust the difference on the frequency between resonance frequency and light carrier
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 double 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, being used for will be micro-
Single sideband modulation is realized in wave signal loading to light carrier, realizes the conversion of microwave signal to optical signal；The laser is used for
Emit continuous light as light carrier；First Polarization Controller is connected with laser, for polarizing to the light carrier
State adjustment；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 not introducing signal for handling single sideband modulated signal
Amplitude jitter and while keep upper side band phase invariant, by the way that the different location near resonance frequency is arranged in carrier wave,
Different phase shifts is introduced to carrier wave；The photodetector is used to be converted Optical All-pass output signal beat frequency
For microwave telecommunication number；Since Optical All-pass does not introduce amplitude jitter, and phase shift is introduced to carrier wave, obtains the carrier wave of phase shift
It is realized micro- with the upper side band beat frequency of phase invariant so that microwave signal phase changes with the phase-shift phase that carrier wave introduces
Wave quantum phase shifter.
Further, the micro-wave light quantum phase shifter can be at optics all-pass by the wavelength of adjusting light carrier
The different position in filter phase shifting region, to introduce different phase shifts；Or the humorous of micro-loop is changed by the 4th optical phase shifter
Vibration frequency realizes the phase of the micro-wave light quantum phase shifter to adjust the phase shift that Optical All-pass is introduced in carrier frequency
Shifting amount is adjustable.
Further, the microwave photon filter and the micro-wave light quantum phase shifter, can be by external laser, modulation
Device and detector are collectively integrated on chip, realize single-chip integration, reduce device size, are increased stability, are reduced cost.
In general, through the invention it is contemplated above technical scheme is compared with the prior art, can obtain down and show
Beneficial effect:
(1) Optical All-pass provided by the invention passes through amplitude due to using, defeated from different port after phase adjusted
Enter micro-loop and 2 ports interference output structure, compared with prior art, by the amplitude of accommodation rather than reduce waveguide loss come
It realizes all-pass filter, solves the problems, such as that micro-loop all-pass filter is sensitive to waveguide loss is difficult to make for cascade, may be implemented
Amplitude response is constant without recess in entire Free Spectral Range.Wherein, spacing is coupled by changing micro-loop, thus it is possible to vary system
Phase filtering spectrum width, thus real narrow bandwidth or other required phase filtering spectrum widths.
(2) high q-factor provided by the invention, superelevation inhibit the microwave photon filter of ratio, due to that can make all-pass wave filtering
It realizes that weak-coupling state obtains the all-pass filter of narrowband phase filtering by changing micro-loop coupling spacing when device, thus constitutes
Microwave photon filter narrower bandwidth has good frequency selectivity, and due to the method using interference cancellation, in narrowband
While wide there is superelevation to inhibit ratio, improves the filtering performance of microwave photon filter.
(3) operating frequency range provided by the invention is big, and in working range amplitude response non-jitter microwave photon
Phase shifter will not introduce amplitude jitter while realizing different phase shifts since all-pass filter amplitude response is constant,
And additional filter shape will not be brought.Since all-pass filter is narrow bandwidth phase filter, compared to traditional base
In the phase shifter of micro-loop, the phase shift to more lower frequency microwave signals may be implemented, improve the operating frequency range of phase shifter.
(4) Optical All-pass provided by the invention realizes the tuning of filter 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 wave device phase filtering.Microwave photon filter as a result, based on Optical All-pass construction is realized
Filter center frequency is adjustable, and that micro-wave light quantum phase shifter realizes phase-shift phase is adjustable.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of Optical All-pass provided by the invention；
Fig. 2 is micro-loop cellular construction schematic diagram.
Fig. 3 is Optical All-pass simulation result provided by the invention；
Fig. 4 is structural schematic diagram of the microwave photon provided by the invention with resistance-trap filter；
Fig. 5 is schematic illustration of the microwave photon with resistance-trap filter that invention provides；
Fig. 6 is simulation result of the microwave photon with resistance-trap filter that invention provides；
Fig. 7 is the structural schematic diagram of micro-wave light quantum phase shifter device provided by the invention；
Fig. 8 is the schematic illustration for the micro-wave light quantum phase shifter that invention provides；
Fig. 9 is the micro-wave light quantum phase shifter phase response simulation result that invention provides.
Figure 10 is the micro-wave light quantum phase shifter amplitude response simulation result that invention provides
In all the appended drawings, identical appended drawing reference is used to denote the same element or structure, in which: 1- first couples light
Grid, the first optical coupler of 2-, the first optical phase shifter of 3-, the second optical coupler of 4-, the second optical phase shifter of 5-, 6- third
Optical phase shifter, the 4th optical phase shifter of 7-, 8- micro-loop, the second coupling grating of 9-.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
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 the various embodiments of the present invention described below
Not constituting a conflict with each other can be combined with each other.
Technical solution of the present invention is further described in detail with reference to the accompanying drawings and detailed description.
The structural schematic diagram 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 input terminal of the first optical coupler, the second optical coupler
MZI structure is constituted together with the first optical phase shifter；
Micro-loop as shown in Figure 2 is 1 port (10), 2 ports (11), 3 ports (12) and 4 ports respectively there are four port
(13)；
The working principle of the Optical All-pass is to realize amplitude regulation by adjusting the first optical phase shifter in MZI,
Change the splitting ratio of 1 port of micro-loop (10) and 3 ports (12) input signal；By adjust second, third optical phase shifter make it is micro-
1 port of ring is identical as the phase of 3 port input signals；Two paths of signals after amplitude, phase regulation is respectively from 1 port of micro-loop
Enter micro-loop with 3 ports, micro-loop therein realizes required phase filtering spectrum width by changing coupling spacing in production.
Interfere output after micro-loop is handled in 2 ports (11) two ways of optical signals of micro-loop, realization amplitude response is constant purpose, is obtained
Phase response changes with frequency, i.e., there are the Optical All-pass of 2 π phase shifts within the scope of micro-ring resonant frequency 1GHz.
Fig. 3 is the simulation result of Optical All-pass, it can be seen that the optical signal inputted from 1 port of micro-loop is in 2 ports
Output falls into shape for band, and the optical signal inputted from 3 ports is bandpass shape in the output of 2 ports, the two-way letter by amplitude adjusted
Beam interferometer is closed in 2 ports number after micro-loop is handled and then realizes the amplitude that amplitude response do not show as constant with frequency variation
Response curve；And 2 the phase of port output signal there are 2 π phase shifts within the scope of resonance frequency 1GHz.
Fig. 4 is structural schematic diagram 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
It surveys device and is connected with all-pass wave filtering is learned.
Schematic illustration 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, generates amplitude, the identical single order upper side band of phase and lower sideband；Optical All-pass pair
Modulated optical signal is handled, if the amplitude response of figure all-pass filter is not change flat straight line with frequency, therefore pass through
Upper and lower sideband amplitude keeps equal after crossing all-pass filter, and the phase shift that signal upper side band is introduced due to all-pass filter, upper,
Only in resonance point, there are π phase differences for lower sideband；By photodetector beat frequency, optical signal is converted to microwave telecommunication number and humorous
Vibration point forms band and falls into filtering, realizes microwave photon band resistance-trap filter.
In addition, changing the resonance frequency of micro-loop by the 4th optical phase shifter, carried with adjusting resonance frequency and light
Difference on the frequency between wave 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 filter realizes centre frequency
It is adjustable, and due to the phase filtering narrower bandwidth of all-pass filter, which has the bandwidth less than 1GHz, by
In the method for using interference cancellation, there is the inhibition ratio greater than 70dB.
Fig. 7 be the micro-wave light quantum phase shifter based on Optical All-pass of the present invention structural schematic diagram, 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 double drive horse by modulator
Conspicuous Zeng Deer modulator 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 schematic illustration of the micro-wave light quantum phase shifter as shown in Figure 8, by single sideband modulation module, i.e. modulator cascades
Optical band pass filter or electric orthogonal mixer combination double drive MZ Mach-Zehnder obtain single sideband modulated signal, realize
Conversion of the microwave signal to optical signal.Optical All-pass handles single sideband modulated signal, such as figure all-pass filter
Amplitude response be do not change flat straight line with frequency, therefore do not introduce signal amplitude shake.And upper side band is in detuning
Position phase invariant, and carrier wave setting is introduced into phase shift near resonance frequency.By photodetector, carrier wave and the phase of phase shift
The upper side band beat frequency of invariant position, optical signal are 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, by adjust light carrier wavelength, be located at the different position in Optical All-pass phase shifting region from
And different phase shifts is introduced, or change the resonance frequency of micro-loop by the 4th optical phase shifter, to adjust optics all-pass
The phase shift that 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 to be respectively set
In different positions, which realizes different degrees of phase shift to microwave signal.And since the phase of all-pass filter is filtered
Wave narrower bandwidth, so that the also available good phase shift of the microwave signal of low frequency, improves the working range of phase shifter.Such as figure
10 be the simulation result of the micro-wave light quantum phase shifter amplitude response, and the phase shifter is while realizing phase shift to the amplitude of signal
The insertion loss of an entirety is introduced, amplitude response is constant, does not bring additional filter shape.And carrier wave is set respectively
It sets when different phase shifts are realized in different positions, amplitude is always consistent, and each curve, which overlaps, to be had similarly
Insertion loss, it is achieved that amplitude remains unchanged when 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, not to
The limitation present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should all include
Within protection scope of the present invention.
Claims (11)
1. a kind of Optical All-pass, which is characterized in that including the first optical coupler (2), the second optical coupler (4),
First optical phase shifter (3), the second optical phase shifter (5), third optical phase shifter (6) and micro-loop (8)；Wherein:
First optical coupler uses 1 × 2 optical splitter, and the second optical coupler uses 2 × 2 multi-mode interference couplers；
The first optical coupler output end upper arm is connected by waveguide with the input terminal upper arm of the second optical coupler, defeated
Outlet lower arm is connected by waveguide with the input terminal lower arm of the second optical coupler, and the waveguide of two lower arms of connection is equipped with the first optics
Phase-shifter (3), for changing the waveguide transmission signal phase；
There are four ports for the micro-loop, are first port (10), second port (11), third 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), which is curved
It is curved identical as lower arm waveguide length with holding, and the second optical phase shifter (5) are equipped with, for changing waveguide transmission signal phase
Position；The second optical coupler output end lower arm is connected by waveguide with micro-loop third port (12), waveguide length and upper arm
Waveguide is identical, which is equipped with third optical phase shifter (6), for changing waveguide transmission signal phase, to make to hold from two
The signal that mouth enters micro-loop keeps phase identical；
Input terminal of the input terminal of first optical coupler as Optical All-pass；The micro-loop second port conduct
The output end of Optical All-pass；
In work, the first optical coupler and the second optical coupler input terminal and the first optical phase shifter together form MZI,
Mach-Zender interferometer structure；The signal phase for passing through the waveguide is adjusted by the first optical phase shifter, and described in process
MZI constructive interference realizes amplitude regulation, to change micro-loop first port (10) and third port (12) two-way input signal
Splitting ratio；First port input signal and second port input signal phase are adjusted by second, third optical phase shifter (5,6)
Difference keeps micro-loop first port identical as the phase of third port input signal；Two paths of signals point after amplitude, phase regulation
Micro-loop is not entered from micro-loop first port and third port, the two ways of optical signals is defeated in second port (11) interference of micro-loop
Out, and then amplitude response is obtained as constant, there are the optics all-pass wave filterings of 2 π phase shifts near micro-ring resonant frequency for phase response
Device；By changing the spacing between the micro-loop and its upper and lower two straight wave guide, the adjustment of coupling spacing is realized, thus needed for obtaining
Phase filtering spectrum width.
2. Optical All-pass as described in claim 1, which is characterized in that further include the first coupling grating (1) and second
Coupling grating (9)；
First coupling grating is connected as input terminal with the input terminal of the first optical coupler, as Optical All-pass
Input terminal；
Second coupling grating is connected with micro-loop second port, the output end as Optical All-pass.
3. a kind of microwave photon band resistance-trap filter based on Optical All-pass described in claim 1, which is characterized in that also wrap
Include laser, the first Polarization Controller, modulator, the second Polarization Controller and photodetector；Wherein:
The laser is for emitting 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, for adjusting the polarization state of signal after modulated device is modulated；The Optical All-pass input terminal
It is connected with the second Polarization Controller output end；The photodetector is connected with Optical All-pass output end, and being used for will be defeated
Optical signals are converted to electric signal；
The modulator is intensity modulator, for being modulated to by polarization state light carrier adjusted, generation amplitude,
The identical single order upper side band of phase and lower sideband realize the conversion of microwave signal to optical signal；
The Optical All-pass is keeping upper and lower sideband amplitude identical for handling modulated upper and lower sideband optical signal
While, phase shift is introduced to upper side band set specific frequency signal, making upper and lower sideband, only there are 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
Vibration point forms band and falls into filtering, realizes microwave photon band resistance-trap filter.
4. a kind of microwave photon bandpass filter based on Optical All-pass described in claim 1, which is characterized in that also wrap
Include laser, the first Polarization Controller, modulator, the second Polarization Controller and photodetector；Wherein:
The laser is for emitting 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, for adjusting the polarization state of signal after modulated device is modulated；The Optical All-pass input terminal
It is connected with the second Polarization Controller output end；The photodetector is connected with Optical All-pass output end, and being used for will be defeated
Optical signals are converted to electric signal；
The modulator is phase-modulator, for being modulated to by polarization state light carrier adjusted, generates amplitude phase
Same, opposite in phase single order upper side band and single order lower sideband realize the conversion of microwave signal to optical signal；
The Optical All-pass is for handling modulated optical signal, the upper and lower side generated after keeping modulators modulate
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
Reverse phase is kept in other frequencies；
The photodetector is used to make beat frequency processing to Optical All-pass output, and optical signal is made to be converted to microwave telecommunication number
And bandpass filtering is formed in resonance point, realize microwave photon bandpass filter.
5. filter as described in claim 3 or 4, which is characterized in that be equipped with the 4th optics in the all-pass optical filter
Phase-shifter realizes the filtering for changing the resonance frequency of micro-loop to adjust the difference on the frequency between resonance frequency and light carrier
The filter center frequency of device is adjustable.
6. filter as claimed in claim 5, which is characterized in that the first optical phase shifter (3), the second optical phase shifter (5),
Third optical phase shifter (6) and the 4th optical phase shifter (7) are realized using heating electrode, PN junction or luminous power structure.
7. filter as claimed in claim 5, which is characterized in that the filter is following material system: SOI base, organic
Polymer, silicon nitride, silicon oxynitride, silica；The filter is following waveguiding structure: waveguide, ridge waveguide, slit wave
It leads and surface plasma waveguide.
8. a kind of micro-wave light quantum phase shifter based on Optical All-pass described in claim 1, which is characterized in that further include swashing
Light device, the first Polarization Controller, single sideband modulation module, the second Polarization Controller and photodetector；Wherein:
The single sideband modulation module is that modulator cascades optical band pass filter or electric orthogonal mixer combination double drive Mach-
Zeng Deer modulator composition, carrier input are connected with the first Polarization Controller；Single sideband modulation module modulation termination microwave
Input signal realizes single sideband modulation for microwave signal to be loaded on light carrier, realizes that microwave signal turns to optical signal
It changes；
The laser is for emitting 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 shaken and in holding for handling single sideband modulated signal not introducing signal amplitude
While side band phase is constant, by the way that the different location near resonance frequency is arranged in carrier wave, different phases is introduced to carrier wave
It moves；
The photodetector is used to be converted into microwave telecommunication number to Optical All-pass output signal beat frequency；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 realizes micro-wave light quantum phase shifter so that microwave signal phase changes with the phase-shift phase that carrier wave introduces.
9. micro-wave light quantum phase shifter as claimed in claim 8, which is characterized in that by adjusting the wavelength of light carrier, make at its
In the different position in Optical All-pass phase shifting region, to introduce different phase shifts；Or it is equipped with the 4th optical phase shifter and comes
The resonance frequency for changing micro-loop realizes the microwave light to adjust the phase shift that Optical All-pass is introduced in carrier frequency
The phase-shift phase of sub- phase shifter is adjustable.
10. filter as described in claim 3 or 4, which is characterized in that external laser, modulator and detector are common
It is integrated on chip.
11. micro-wave light quantum phase shifter as claimed in claim 8 or 9, which is characterized in that external laser, modulator and spy
Device is surveyed to be collectively integrated on chip.
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| CN107589415B (en) * | 2017-09-06 | 2019-08-23 | 南京航空航天大学 | Microwave photon wideband radar imager chip, system |
| 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 |
| CN109946514B (en) * | 2019-03-01 | 2021-04-27 | 昆明理工大学 | Optical microwave photon filtering chip, microwave frequency measurement system and method |
| CN111929927B (en) * | 2020-08-27 | 2023-01-17 | 北京科技大学 | Micro-ring phase shifter with inner surrounding type micro-heater |
| CN113691315B (en) * | 2021-08-24 | 2022-09-20 | 华中科技大学 | Reconfigurable integrated microwave photon band-pass filter |
| CN113991266B (en) * | 2021-10-12 | 2022-11-08 | 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 |
| CN114527535B (en) * | 2022-01-13 | 2022-08-30 | 之江实验室 | High-linearity silicon-based modulator chip based on electro-optical predistorter and high-linearity method |
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