CN109450551B - Multi-octave phase shifting method and device - Google Patents

Multi-octave phase shifting method and device Download PDF

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CN109450551B
CN109450551B CN201811454562.8A CN201811454562A CN109450551B CN 109450551 B CN109450551 B CN 109450551B CN 201811454562 A CN201811454562 A CN 201811454562A CN 109450551 B CN109450551 B CN 109450551B
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CN109450551A (en
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黄善国
高欣璐
雷明政
郑祯楠
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Beijing University of Posts and Telecommunications
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
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    • H04B10/532—Polarisation modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/50—Transmitters
    • H04B10/516—Details of coding or modulation
    • H04B10/548—Phase or frequency modulation

Abstract

The invention discloses a multi-octave phase shifting method and a device, wherein the method comprises the following steps: firstly, carrying out signal modulation on an optical carrier to generate a beam of orthogonal polarized light; the first-order sideband phase factors of the beam of orthogonal polarized light in two orthogonal polarization directions are opposite, and the second-order sideband phase factors are the same; and dividing the beam of orthogonally polarized light equally into a first sub-orthogonally polarized light and a second sub-orthogonally polarized light; then converting the first sub-orthogonal polarized light and the second sub-orthogonal polarized light into first circularly polarized light and second circularly polarized light with opposite rotation directions; analyzing the first circularly polarized light and the second circularly polarized light; and finally, carrying out photoelectric conversion through differential detection to obtain a base frequency photocurrent signal after phase shifting. The device comprises a signal modulation unit, a first polarization controller, a second polarization analyzing controller, a first polarization analyzer, a second polarization analyzer and a balance detector. The invention inhibits the second-order distortion of the photon microwave phase-shifting link based on polarization modulation and differential detection, and improves the phase-shifting accuracy.

Description

Multi-octave phase shifting method and device
Technical Field
The invention relates to the field of microwave phase shifting, in particular to a multi-octave phase shifting method and a multi-octave phase shifting device.
Background
The microwave phase shifter is a basic constituent unit of a beam forming system, a microwave filtering system and the like. The bandwidth and precision of the traditional microwave phase shifter are limited by the electronic bottleneck. In order to solve the bottlenecks of electronics, a microwave phase shifting scheme based on photonics is provided, and the photonics method has the characteristics of high frequency, large bandwidth and immune electromagnetic interference. The microwave phase shift scheme of photonics can cause second-order distortion due to nonlinearity of a modulator, when the power and the bandwidth of an input radio frequency signal are large enough, the second-order distortion and a fundamental frequency signal have frequency spectrum overlapping, and the frequency spectrum overlapping can not be eliminated by using a filter, so that the phase shift accuracy can be influenced, and the microwave phase shift scheme is not suitable for a multi-octave link. In a multi-octave phase-shifting link, how to eliminate the influence of second-order distortion and improve the phase-shifting accuracy becomes a technical problem to be solved urgently.
Disclosure of Invention
The invention aims to provide a multi-octave phase shifting method and a multi-octave phase shifting device, which are used for eliminating the influence of second-order distortion and improving the phase shifting accuracy.
In order to achieve the purpose, the invention provides the following scheme:
in a first aspect of the embodiments of the present invention, a multi-octave phase shifting method is provided, which includes the following steps:
carrying out signal modulation on an optical carrier to generate a beam of orthogonal polarized light; the first-order sideband phase factors of the beam of orthogonal polarized light in two orthogonal polarization directions are opposite, and the second-order sideband phase factors are the same;
dividing the beam of orthogonally polarized light equally into a first sub-orthogonally polarized light and a second sub-orthogonally polarized light;
converting the first sub-orthogonal polarized light and the second sub-orthogonal polarized light into first circularly polarized light and second circularly polarized light with opposite rotation directions;
analyzing the first circularly polarized light and the second circularly polarized light;
and after the polarization detection, carrying out photoelectric conversion through differential detection to obtain a base frequency photocurrent signal after phase shifting.
Optionally, the converting the first sub-orthogonal polarized light and the second sub-orthogonal polarized light into a first circularly polarized light and a second circularly polarized light with opposite rotation directions includes:
and respectively adjusting the phase difference between the orthogonal polarization states of the first sub-orthogonal polarized light and the second sub-orthogonal polarized light, and converting the first sub-orthogonal polarized light and the second sub-orthogonal polarized light into first circularly polarized light and second circularly polarized light with opposite rotation directions.
Optionally, analyzing the first circularly polarized light and the second circularly polarized light, including:
and controlling the polarization detection angle of the first circularly polarized light and the polarization detection angle of the second circularly polarized light, so that the amplitude and the phase of the base frequency optical current signal after phase shifting are continuously adjustable.
Alternatively, the electric field of orthogonally polarized light is as follows:
Figure BDA0001887449550000021
wherein x and y represent two mutually orthogonal polarization directions, ExAnd EyRespectively representing the electric fields of the orthogonally polarized light in the x direction and the y direction, m represents a modulation factor, omega represents the angular frequency of the light source, and omega represents the required frequencyAngular frequency, J, of the phase-shifted RF signal0(m)、J1(m) and J2(m) denotes the 0 th, 1 st and 2 nd order bessel functions, respectively.
Optionally, the electric field of the first sub-orthogonal polarized light is as follows:
Figure BDA0001887449550000022
the electric field of the second sub-orthogonal polarized light is as follows:
Figure BDA0001887449550000023
wherein E isx1And Ey1Respectively representing the electric fields of the first sub-orthogonally polarized light in the x-direction and the y-direction, Ex2And Ey2Respectively representing the electric fields of the second sub-orthogonally polarized light in the x-direction and the y-direction,
Figure BDA0001887449550000024
respectively, the phase difference between the orthogonal polarization states of the first sub-orthogonal polarized light and the second sub-orthogonal polarized light.
Optionally, analyzing the first circularly polarized light and the second circularly polarized light, specifically including:
analyzing the first circularly polarized light to obtain analyzed first linearly polarized light, wherein the electric field E of the analyzed first linearly polarized light1Comprises the following steps:
Figure BDA0001887449550000025
analyzing the second circularly polarized light to obtain analyzed second linearly polarized light, wherein the electric field E of the analyzed second linearly polarized light2Comprises the following steps:
Figure BDA0001887449550000031
wherein, α1Indicating a first angle of analysis, α2Representing a second angle of analysis, Ex1And Ey1Respectively representing the electric fields of the first sub-orthogonally polarized light in the x-direction and the y-direction, Ex2And Ey2Respectively, the electric fields of the second sub-orthogonal polarized light in the x-direction and the y-direction.
Optionally, after the offset detection, performing photoelectric conversion through differential detection to obtain a base-frequency photocurrent signal after phase shift, specifically including:
performing photoelectric conversion on the analyzed first linearly polarized light and the analyzed second linearly polarized light through differential detection to obtain a phase-shifted fundamental frequency photocurrent signal, which is shown as the following formula:
Figure BDA0001887449550000032
wherein E is1Electric field representing the first linearly polarized light after analyzing polarization, E2The electric field of the second linearly polarized light after polarization analysis is shown, m is a modulation factor, omega is the angular frequency of the radio frequency signal needing phase shift, and J0(m)、J1(m) and J2(m) first class Bessel functions of 0 th order, 1 st order and 2 nd order, respectively, α1Indicating a first angle of analysis, α2Representing a second angle of analysis.
In a second aspect of the embodiments of the present invention, a multi-octave phase shifting apparatus is provided, which includes: the device comprises a signal modulation unit, a first polarization controller, a second polarization analyzer, a first polarization analyzer, a second polarization analyzer and a balance detector;
the signal modulation unit is used for generating a beam of orthogonal polarized light; the first-order sideband phase factors of the beam of orthogonal polarized light in two orthogonal polarization directions are opposite, and the second-order sideband phase factors are the same; and dividing the beam of orthogonally polarized light equally into a first sub-orthogonally polarized light and a second sub-orthogonally polarized light;
the first polarization controller is used for adjusting the phase difference of the orthogonal polarization state of the first sub orthogonal polarized light to obtain first circularly polarized light; the second polarization controller is used for adjusting the phase difference of the orthogonal polarization state of the second sub orthogonal polarization light to obtain second circularly polarized light;
the first polarization analyzer is used for analyzing the first circularly polarized light to obtain first linearly polarized light after analysis; the second polarization analyzer is used for analyzing the second circularly polarized light to obtain second linearly polarized light after analysis;
the balance detector is used for carrying out differential detection on the analyzed first linear polarized light and the analyzed second linear polarized light to obtain a phase-shifted fundamental frequency photocurrent signal.
Optionally, the first polarization controller and the second polarization controller are respectively configured to adjust a phase difference to make rotation directions of the first circularly polarized light and the second circularly polarized light opposite.
Optionally, the first analyzer and the second analyzer are respectively configured to control an analyzing angle of the first circularly polarized light and an analyzing angle of the second circularly polarized light, so that the amplitude and the phase of the phase-shifted fundamental frequency optical current signal are continuously adjustable.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention discloses a multi-octave phase shifting method and a device, which carry out signal modulation on an optical carrier signal to generate a beam of orthogonal polarized light; the first-order sideband phase factors of the beam of orthogonal polarized light in two orthogonal polarization directions are opposite, and the second-order sideband phase factors are the same; dividing the beam of orthogonal polarized light into a first sub-orthogonal polarized light and a second sub-orthogonal polarized light equally, and then converting the first sub-orthogonal polarized light and the second sub-orthogonal polarized light into a first circularly polarized light and a second circularly polarized light with opposite rotation directions; then, the first circularly polarized light and the second circularly polarized light are respectively subjected to offset detection and differential detection, so that second-order harmonics in the restored fundamental frequency optical current signal are suppressed, and the second-order intermodulation distortion is suppressed because the amplitude of the second-order intermodulation distortion is twice of the second-order harmonic distortion, so that the influence of the second-order distortion in a multi-octave phase-shifting link is eliminated, and the phase-shifting accuracy is improved.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a flow chart of an embodiment of a multi-octave phase shifting method according to the present invention;
fig. 2 is a schematic diagram of an optical path structure of an embodiment of a multi-octave phase shifting apparatus provided in the present invention.
Detailed Description
The invention aims to provide a multi-octave phase shifting method and a multi-octave phase shifting device, which are used for eliminating the influence of second-order distortion and improving the phase shifting accuracy.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Example 1
Embodiment 1 of the present invention provides a multi-octave phase shifting method, as shown in fig. 1, the method includes the following steps:
step 101, performing signal modulation on an optical carrier to generate a beam of orthogonal polarized light; the beam of orthogonally polarized light has opposite first-order sideband phase factors and the same second-order sideband phase factors in two mutually orthogonal polarization directions.
As an implementation manner, the signal modulation includes signal processing manners such as polarization modulation and filtering.
Step 102, dividing the beam of orthogonal polarized light into a first sub-orthogonal polarized light and a second sub-orthogonal polarized light;
step 103, respectively converting the first sub-orthogonal polarized light and the second sub-orthogonal polarized light into a first circularly polarized light and a second circularly polarized light with opposite rotation directions.
And 104, analyzing the first circularly polarized light and the second circularly polarized light respectively.
And 105, performing photoelectric conversion through differential detection after polarization detection to obtain a base frequency photocurrent signal after phase shifting.
According to the multi-octave phase shifting method, a beam of orthogonal polarized light meeting specific conditions is generated through signal modulation, the orthogonal polarized light is evenly divided and then is respectively converted into circularly polarized light, and second-order distortion of a photon microwave phase shifting link is restrained through polarization detection and differential detection, so that the phase shifting accuracy is improved.
Example 2
Embodiment 2 of the present invention provides a preferred embodiment of a multi-octave phase shifting method.
Referring to the optical path shown in fig. 2, in this embodiment, first, a beam of orthogonally polarized light is generated by signal processing methods such as polarization modulation and filtering; the beam of orthogonally polarized light has opposite phase factors of the first-order sidebands and the same phase factor of the second-order sidebands in two mutually orthogonal polarization directions. The electric field of the orthogonally polarized light can be expressed as
Figure BDA0001887449550000051
Wherein x and y represent two mutually orthogonal polarization directions, ExAnd EyRespectively representing the electric fields of the orthogonal polarized light in the x direction and the y direction, m is a modulation factor, omega is the angular frequency of a light source, omega is the angular frequency of a radio frequency signal needing phase shift, Jn(m) is an nth order Bessel function of the first kind. exp is an exponential function with a natural constant e as the base.
Then, the orthogonal polarization signal is uniformly divided into two parts, i.e., first sub orthogonal polarization light and second sub orthogonal polarization light, and two channels CH1 and CH2 are configured to allow the first sub orthogonal polarization light and the second sub orthogonal polarization light to pass through, respectively. The electric fields of the first and second sub-orthogonal polarizations may be expressed as
Figure BDA0001887449550000061
Figure BDA0001887449550000062
Wherein
Figure BDA0001887449550000063
The phase difference between the orthogonal polarization states of the first and second sub-orthogonal polarizations, respectively, i.e.
Figure BDA0001887449550000064
Is the phase difference between the optical wave signals of the first sub-orthogonal polarized light in the x-direction and the y-direction,
Figure BDA0001887449550000065
is the phase difference between the x-direction and y-direction light wave signals of the second sub-orthogonal polarized light.
Then, the phase difference between the orthogonal polarization states/orthogonal directions can be controlled by a polarization controller PC (polarization controller)
Figure BDA0001887449550000066
And
Figure BDA0001887449550000067
so that the two orthogonally polarized lights are circularly polarized but rotate in opposite directions, i.e.
Figure BDA0001887449550000068
The two circularly polarized light are then analyzed by two analyzers. The electric field of the analyzed signal can be expressed as
Figure BDA0001887449550000069
Figure BDA00018874495500000610
α therein1，α2Is the angle of polarization analysis.
Finally, the detected light signal is injected into a Balanced Photodetector (BPD) for photoelectric conversion. The electric field of the photocurrent recovered by the BPD can be expressed as
Figure BDA00018874495500000611
It can be seen that the dc component and the second order harmonics are suppressed. Due to the fact that
Figure BDA00018874495500000612
The second order intermodulation distortion is twice as large in amplitude as the second order harmonic distortion. Further, second order intermodulation distortion is also suppressed.
Wherein
Figure BDA00018874495500000613
And
Figure BDA00018874495500000614
are respectively E1And E2I (t) is the electric field of the phase-shifted fundamental photocurrent signal.
By controlling the angle of analysis α1And α2The amplitude and phase of the base frequency signal are continuously adjustable. Therefore, the phase shift of the all-optical multi-octave is realized.
Wherein equations (1) - (6) correspond to the electric fields at (a) - (f) in fig. 2, respectively.
According to the embodiment of the invention, a beam of orthogonal polarized light with opposite first-order sideband phase factors and same second-order sideband phase factors in two orthogonal polarization directions is generated through signal modulation, and then is divided equally and then passes through two channels to carry out dual-channel polarization state adjustment, polarization detection and differential detection, so that second-order distortion after photoelectric conversion is carried out on the two channels is mutually counteracted. And the amplitude and the phase of the output fundamental frequency signal are adjusted by adjusting the polarization detection angles of the two channels, and the second-order distortion can be still inhibited while the amplitude and the phase of the output fundamental frequency signal are adjusted.
Example 3
Embodiment 3 of the present invention provides a multi-octave phase shifting apparatus, as shown in fig. 2, the phase shifting apparatus includes: a signal modulation unit (not shown in fig. 2), a first polarization controller PC1, a second polarization analyzer controller PC2, a first polarization analyzer Pol1, a second polarization analyzer Pol2 and a balanced detector BPD.
The signal modulation unit generates a beam of orthogonal polarized light (a) through signal processing modes such as polarization modulation and filtering; the beam of orthogonally polarized light (a) has opposite first-order sideband phase factors in its two mutually orthogonal polarization directions. The phase factors of the second order sidebands are the same. Then, the orthogonal polarized light (a) is uniformly divided into two parts, and a first sub orthogonal polarized light (b) and a second sub orthogonal polarized light (c) are obtained.
The first polarization controller PC1 is configured to adjust a phase difference of an orthogonal polarization state of the first sub-orthogonal polarized light (b) to obtain a first circularly polarized light; the second polarization controller PC2 is for adjusting the phase difference of the orthogonal polarization state of the second sub-orthogonal polarized light (c) to obtain second circularly polarized light.
Preferably, as an embodiment, the rotation directions of the first circularly polarized light and the second circularly polarized light are opposite.
The first polarization analyzer Pol1 is used for analyzing the first circularly polarized light to obtain the first linearly polarized light (d) after being analyzed. The second analyzer Pol2 is used for analyzing the second circularly polarized light to obtain the second linearly polarized light (e) after analyzing the polarization. Pol, i.e., Polarizer.
The balance detector BPD is used for obtaining a base frequency photocurrent signal (f) after phase shifting through differential detection on the first linearly polarized light (d) after polarization analysis and the second linearly polarized light (e) after polarization analysis. Referring to fig. 2, two PDs (photodetectors) are disposed inside the balanced detector BPD, which are PD1 and PD2, respectively, and preferably, the first linearly polarized light (d) after polarization detection and the second linearly polarized light (e) after polarization detection are photoelectrically converted by PD1 and PD2, respectively, and then are subjected to a differential operation to output a phase-shifted fundamental optical current signal (f).
The multi-octave phase shifting method and the device inhibit the second-order distortion of the photonic microwave phase shifting link based on polarization modulation and differential detection, and improve the phase shifting accuracy. Specifically, a beam of orthogonal polarized light with a first-order sideband phase factor opposite and a second-order sideband phase factor identical is equally divided into two parts; then adjusting the polarization controller to change the polarization state of each portion of the orthogonally polarized light, respectively, so that the two portions of light become circularly polarized light with opposite rotation directions; and finally, the polarization detection angle is changed by adjusting the polarization controller or the polarization detector, so that the amplitude and the phase of the fundamental frequency photocurrent signal shot by the photoelectric detector are adjusted. Meanwhile, the second-order distortion photocurrents shot by the two parts of optical signals are equal in size and same in phase and do not change along with the phase of the fundamental frequency photocurrent signal, so that the second-order distortion photocurrents can be well inhibited after balanced detection.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principle and the implementation manner of the present invention are explained by applying specific examples, the above description of the embodiments is only used to help understanding the method of the present invention and the core idea thereof, the described embodiments are only a part of the embodiments of the present invention, not all embodiments, and all other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the protection scope of the present invention.

Claims (10)

1. A multi-octave phase shifting method is characterized by comprising the following steps:
carrying out signal modulation on an optical carrier to generate a beam of orthogonal polarized light; the first-order sideband phase factors of the orthogonal polarized light in two orthogonal polarization directions are opposite, and the second-order sideband phase factors are the same;
dividing the beam of orthogonally polarized light equally into a first sub-orthogonally polarized light and a second sub-orthogonally polarized light;
converting the first sub-orthogonal polarized light and the second sub-orthogonal polarized light into first circularly polarized light and second circularly polarized light with opposite rotation directions;
analyzing the first circularly polarized light and the second circularly polarized light;
and after the polarization detection, carrying out photoelectric conversion through differential detection to obtain a base frequency photocurrent signal after phase shifting.
2. The multi-octave phase shifting method according to claim 1, wherein the converting the first sub-orthogonal polarized light and the second sub-orthogonal polarized light into a first circularly polarized light and a second circularly polarized light with opposite rotation directions comprises:
adjusting phase differences between orthogonal polarization states of first sub-orthogonal polarized light and second sub-orthogonal polarized light respectively, and converting the first sub-orthogonal polarized light and the second sub-orthogonal polarized light into first circularly polarized light and second circularly polarized light with opposite rotation directions.
3. The multi-octave phase shifting method of claim 1, wherein analyzing the first circularly polarized light and the second circularly polarized light comprises:
and respectively controlling the polarization detection angle of the first circularly polarized light and the polarization detection angle of the second circularly polarized light, so that the amplitude and the phase of the base frequency optical current signal after phase shifting are continuously adjustable.
4. The method of claim 1, wherein the electric field of the orthogonally polarized light is as follows:
Figure FDA0002402494150000011
wherein x and y represent two mutually orthogonal polarization directions, ExAnd EyRespectively representing the electric fields of the orthogonal polarized light in the x direction and the y direction, m represents a modulation factor, omega represents the angular frequency of a light source, omega represents the angular frequency of a radio frequency signal needing phase shifting, J0(m)、J1(m) and J2(m) denotes the 0 th, 1 st and 2 nd order bessel functions, respectively.
5. The method of claim 4, wherein the electric field of the first sub-orthogonal polarized light is represented by the following formula:
Figure FDA0002402494150000021
the electric field of the second sub-orthogonal polarized light is as follows:
Figure FDA0002402494150000022
wherein E isx1And Ey1Respectively representing the electric fields of the first sub-orthogonally polarized light in the x-direction and the y-direction, Ex2And Ey2Respectively representing the electric fields of the second sub-orthogonal polarized light in the x-direction and the y-direction,
Figure FDA0002402494150000023
respectively, the phase difference between the orthogonal polarization states of the first sub-orthogonal polarized light and the second sub-orthogonal polarized light.
6. The multi-octave phase shifting method according to claim 5, wherein the analyzing the first circularly polarized light and the second circularly polarized light comprises:
analyzing the first sub-orthogonal polarized light to obtain analyzed first linearly polarized light, wherein the electric field E of the analyzed first linearly polarized light1Comprises the following steps:
Figure FDA0002402494150000024
analyzing the second sub-orthogonal polarized light to obtain analyzed second linearly polarized light, wherein the electric field E of the analyzed second linearly polarized light2Comprises the following steps:
Figure FDA0002402494150000025
wherein, α1Indicating a first angle of analysis, α2Representing a second angle of analysisDegree, Ex1And Ey1Respectively representing the electric fields of the first sub-orthogonally polarized light in the x-direction and the y-direction, Ex2And Ey2Respectively representing the electric fields of the second sub-orthogonal polarized light in the x-direction and the y-direction.
7. The multi-octave phase shifting method according to any one of claims 1 to 6, wherein the analyzing and performing photoelectric conversion by differential detection to obtain the phase-shifted fundamental frequency photocurrent signal specifically comprises:
performing photoelectric conversion on the analyzed first linearly polarized light and the analyzed second linearly polarized light through differential detection to obtain a phase-shifted fundamental frequency photocurrent signal, which is shown as the following formula:
Figure FDA0002402494150000026
wherein E is1Electric field representing the first linearly polarized light after analyzing polarization, E2The electric field of the second linearly polarized light after polarization analysis is shown, m is a modulation factor, omega is the angular frequency of the radio frequency signal needing phase shift, and J0(m)、J1(m) and J2(m) first class Bessel functions of 0 th order, 1 st order and 2 nd order, respectively, α1Indicating a first angle of analysis, α2Which represents the second angle of polarization analysis,
Figure FDA0002402494150000031
and
Figure FDA0002402494150000032
are respectively E1And E2I (t) is the electric field of the phase-shifted fundamental photocurrent signal.
8. A multi-octave phase shifting apparatus, comprising: the device comprises a signal modulation unit, a first polarization controller, a second polarization controller, a first analyzer, a second analyzer and a balance detector;
the signal modulation unit is used for generating a beam of orthogonal polarized light, and the first-order sideband phase factors of the beam of orthogonal polarized light in two orthogonal polarization directions are opposite, and the second-order sideband phase factors of the beam of orthogonal polarized light are the same; and dividing the beam of the orthogonally polarized light into a first sub-orthogonally polarized light and a second sub-orthogonally polarized light;
the first polarization controller is used for adjusting the phase difference of the orthogonal polarization state of the first sub orthogonal polarization light to obtain first circularly polarized light; the second polarization controller is used for adjusting the phase difference of the orthogonal polarization state of the second sub orthogonal polarization light to obtain second circularly polarized light;
the first polarization analyzer is used for analyzing the first circularly polarized light to obtain a first linearly polarized light after being analyzed; the second polarization analyzer is used for analyzing the second circularly polarized light to obtain second linearly polarized light after analysis;
the balance detector is used for carrying out differential detection on the analyzed first linear polarized light and the analyzed second linear polarized light to obtain a phase-shifted fundamental frequency photocurrent signal.
9. The multi-octave phase shifting apparatus of claim 8, wherein the first polarization controller and the second polarization controller are respectively configured to rotate the first circularly polarized light and the second circularly polarized light in opposite directions by adjusting the phase difference.
10. The multi-octave phase shifting apparatus of claim 8, wherein the first analyzer and the second analyzer are respectively configured to control an analyzing angle of the first circularly polarized light and an analyzing angle of the second circularly polarized light, so that an amplitude and a phase of the phase-shifted fundamental optical current signal are continuously adjustable.
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