CN112097811A - Nonlinear interference type double-parameter sensor based on correlation injection scheme - Google Patents
Nonlinear interference type double-parameter sensor based on correlation injection scheme Download PDFInfo
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- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
- G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
- G01D5/353—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
- G01D5/35306—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using an interferometer arrangement
- G01D5/35332—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using an interferometer arrangement using other interferometers
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- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
- G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
- G01D5/353—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
- G01D5/35383—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using multiple sensor devices using multiplexing techniques
- G01D5/35387—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using multiple sensor devices using multiplexing techniques using wavelength division multiplexing
Abstract
The invention discloses a nonlinear interference type double-parameter sensor based on a correlation injection scheme, which comprises three beams of pump light, a beam of seed light, three optical fiber parametric amplifiers, two optical beam splitters and the like. The optical fiber parametric amplifier used as the beam splitting and combining device of the nonlinear interferometer has the following characteristics: the pump light wavelength 1550nm is in the anomalous dispersion region of the dispersion shifted fiber to satisfy the phase matching condition during the four-wave mixing process in the fiber. The associated light beam generated by the first optical fiber parametric amplifier with the beam splitting function is split by the two optical beam splitters to generate two pairs of twin light beams, the single-mode fibers of two idle frequency optical channels influence the phase of the transmitted light beam through two parameters to be measured, and then the two pairs of twin light beams are injected into the second optical fiber parametric amplifier and the third optical fiber parametric amplifier respectively, so that the phase uncertainty of the idle frequency light at the output ends of the two nonlinear interferometers can be changed, and high-sensitivity double-parameter sensing can be realized by measuring the phase uncertainty of the two idle frequency light beams.
Description
Technical Field
The invention provides a nonlinear interference type double-parameter sensor based on a correlation injection scheme, and belongs to the technical field of optical fiber sensing.
Background
Since the measurement sensitivity of the conventional linear fiber interferometer is limited by the standard quantum limit, the measurement sensitivity is often difficult to perceive for small changes in the environment, and a nonlinear interferometer can be used for realizing sensing with higher sensitivity. Unlike linear interferometers, in which a fiber parametric amplifier (FOPA) is used as a nonlinear medium instead of a linear beam splitter in a linear interferometer, a large increase in sensitivity can be achieved by injecting only coherent states.
The optical fiber parametric amplifier of the light splitting and combining device in the nonlinear interferometer is based on a four-wave mixing process in an optical fiber, and the fact that quantum correlation exists between two output light beams of the four-wave mixing process is known to be used for realizing high-sensitivity parameter sensing. However, a single non-linear interferometer can be used to sense a single physical quantity, and if sensing of a plurality of physical quantities is performed, a plurality of interferometers are required, but simply preparing a plurality of interferometers makes the system very complicated. How can sensing of two physical quantities be achieved with minimal modification on the basis of a non-linear interferometer? In the invention, the related light beams generated in the first four-wave mixing process are split by the two linear beam splitters and then injected into the next two independent four-wave mixing processes, and because quantum correlation still exists between the light beams passing through the beam splitters, two sets of independent high-sensitivity nonlinear interferometers can be formed, so that double-parameter high-sensitivity sensing is realized.
Disclosure of Invention
The invention aims to solve the problem that the measurement sensitivity of the conventional linear interference type double-parameter sensor is limited by a standard quantum limit, and provides a nonlinear interference type double-parameter sensor based on a correlation injection scheme, which can break through the limitation. In particular, the invention divides the related light beam generated in the first four-wave mixing process through the linear beam splitter and injects the divided light beam into the next two four-wave mixing processes to form two sets of independent nonlinear interferometers, because quantum association still exists between the light beams passing through the linear beam splitter, high-sensitivity sensing of double parameters is realized, and extremely small changes of parameters in the environment can be identified with extremely high minimum resolution precision.
The technical scheme adopted by the invention is as follows:
a nonlinear interference type double-parameter sensor based on a correlation injection scheme comprises three beams of pump light, seed light, three optical fiber parametric amplifiers and two beam splitters; the connection mode is as follows: the first optical fiber parametric amplifier is injected into the first optical fiber parametric amplifier together with the seed light, the first optical fiber parametric amplifier plays a role of beam splitting, the generated associated light beams are respectively divided into two signal beams and two idler frequency beams after passing through a beam splitter, one of the idler frequency light beams is applied with a first parameter to be measured and then is injected into a second optical fiber parametric amplifier together with one of the signal light beams and the pump light beam, the rest idle frequency light beam is applied with the second parameter to be measured and then injected into a third optical fiber parametric amplifier together with the other signal light beam and the pump light beam, the second and third optical fiber parametric amplifiers play a beam combining role, the output end signal and idler frequency light of the second and third optical fiber parametric amplifiers are connected into an oscilloscope through a photoelectric detector, detecting the phase uncertainty of the two beams of idler frequency light so as to realize the sensing of the double-parameter change of the first parameter to be detected and the second parameter to be detected; the first parameter to be measured and the second parameter to be measured are physical quantities capable of changing the phase of the light beam in the optical fiber.
The first, second and third optical fiber parametric amplifiers are composed of two coarse wavelength division multiplexers and a dispersion shift optical fiber in the middle, and simultaneously, the wavelength of the pump light is 1550nm and is positioned in an anomalous dispersion area of the dispersion shift optical fiber, so that the phase matching condition generated in the four-wave mixing process in the optical fiber is met.
Including but not limited to temperature, strain, magnetic field, refractive index, acceleration, vibration, etc.
The first parameter to be measured is strain and the second parameter to be measured is temperature, which are the preferred parameters, because the two physical quantities are widely applied in real life. The specific principle is as follows: when the temperature and the strain of the optical fiber change, the change of the length and the refractive index of the optical fiber causes the phase change, and the high-sensitivity sensing of the temperature and the strain can be realized through the measurement of the phase uncertainty.
Compared with the prior art, the invention has the beneficial effects that:
1. compared with a linear interference type double-parameter (temperature and strain) sensor, the minimum resolvable temperature (strain) precision of the nonlinear interference type double-parameter (temperature and strain) sensor based on the associated injection scheme is improved by 1.02 dB.
2. Compared with a linear interference type double-parameter (temperature and strain) sensor, the phase uncertainty of the nonlinear interference type double-parameter (temperature and strain) sensor based on the associated injection scheme has higher change rate to the double-parameter (temperature and strain) to be measured, namely, the higher-sensitivity double-parameter (temperature and strain) to be measured sensing can be realized.
3. The nonlinear interference type double-parameter sensor based on the associated injection scheme can be used for realizing double-parameter high-sensitivity sensing of various physical quantities (such as refractive index, magnetic field, vibration, acceleration and the like) capable of changing optical phase in optical fiber.
Drawings
Figure 1 is a specific arrangement of a non-linear interferometric type two-parameter (temperature and strain) sensor based on a correlated injection scheme.
Fig. 2 is a schematic diagram of a nonlinear interferometric two-parameter sensor principle based on a correlated injection scheme. Wherein: FOPA1, FOPA2 and FOPA3 are gains of G respectively1、G2、G3Of an optical fiber parametric amplifier, T1And T2Transmittance of two optical beam splitters, SC: strain controller, TC: a temperature controller.
Fig. 3 is a schematic diagram of a linear interferometric type two-parameter (temperature and strain) sensor. Wherein: BS1, BS2, BS3 are beam splitters with a transmission equal to 0.5, T1And T2Transmittance of the two beam splitters, SC: strain controller, TC: a temperature controller.
FIG. 4 shows that when G is 3, Ns＝6250，T1＝T2When 0.5, FOPA3(FOPA2) outputs light
Phase uncertainty and linear interferometer output light
The phase uncertainty varies with phase phi.
FIG. 5 shows that when G is 3, T1＝T2＝0.5，φ＝φ2＝φ1When pi, FOPA3(FOPA2) outputs light
Phase uncertainty and linear interferometer output light
Phase uncertainty to total number of photons N inside interferometersThe dependency of (c).
FIG. 6 shows that when G is 3, Ns＝6250，T1＝T2FOPA3 outputs light when equal to 0.5
Minimum resolvable temperature and linear interferometer output light
Minimum resolvable temperature with phase phi2The variation relationship of (a).
FIG. 7 shows that when G is 3, Ns＝6250，T1＝T2FOPA2 outputs light when equal to 0.5
Minimum resolvable strain and linear interferometer output light
Minimum resolvable strain with phase phi1The variation relationship of (a).
FIG. 8 shows that when G is 3, T1＝T2＝0.5，φ2At pi, FOPA3 output
Minimum resolvable temperature and linear interferometer output
The minimum resolvable temperature is a function of the total number of photons inside the interferometer.
FIG. 9 shows that when G is 3, T1＝T2＝0.5，φ1At pi, FOPA2 output
Minimum resolvable strain and linear interferometer output
The minimum resolvable strain is a function of the total number of photons inside the interferometer.
FIG. 10 shows that when G is 3, T1＝T2＝0.5，φ2At pi, FOPA3 output
Phase uncertainty and linear interferometer output
Phase uncertainty varies with temperature.
FIG. 11 shows that when G is 3, T1＝T2＝0.5，φ1At pi, FOPA2 output
Phase uncertainty and linear interferometer output
Phase uncertainty is a function of strain.
Detailed Description
The invention will be further described with reference to the following specific examples and the accompanying drawings:
as shown in fig. 1, the nonlinear interferometer based on the correlated injection scheme of the present invention can realize the sensing of two parameters, which are temperature and strain examples, and the following is only used to illustrate and explain the principle of the present invention, but the present invention is not limited to the scope of the present invention.
In this example, the sensor includes: pumping light 1; 2, seed light; coarse wavelength division multiplexers 3, 5, 9, 11, 16, 18; dispersion-shifted optical fibers 4, 10, 17; beam splitters 6, 13; a strain controller 7; a second pump light 8; a photodetector 12; a temperature controller 14; pump light three 15; an oscilloscope 19. Wherein, the coarse wavelength division multiplexer 3, the dispersion displacement optical fiber 4 and the coarse wavelength division multiplexer 5 form a parametric amplifier FOPA 1; the coarse wavelength division multiplexer 9, the dispersion displacement optical fiber 10 and the coarse wavelength division multiplexer 11 form a parametric amplifier FOPA 2; the coarse wavelength division multiplexer 16, the dispersion shift optical fiber 17 and the coarse wavelength division multiplexer 18 form a parametric amplifier FOPA 3. The connection mode is as follows: the pump light 1 and the seed light 2 are injected into FOPA1 together, the FOPA1 output idler frequency light passing through the beam splitter 13 is injected into FOPA2(FOPA3) through a strain controller 7 (temperature controller 14) and FOPA1 output signal light passing through the beam splitter 6 and the pump light two 8 (pump light three 15), and the signal light and the idler frequency light at the output ends of FOPA2 and FOPA3 are connected into an oscilloscope 19 through a photoelectric detector 12 for phase uncertainty analysis.
Principle analysis:
a schematic of the principle of the invention is shown in fig. 2. We polish the seeds
And pump light p1Injected into FOPA1, and the twin beams generated by the four-wave mixing process in the optical fiber respectively pass through the transmission rate T1And T2The four beams of signal idler lights after the beam splitter and the strain controller and the temperature controller can be respectively expressed as
Wherein G is1Is the gain of FOPA1 and has G1-g11. Then will be
And pump light p2Are co-injected into the FOPA2,
and pump light p3Injected into FOPA3 together, the four beams of light fields to be measured can be respectively described as
Wherein G is3(G2) Is the gain, φ, of FOPA3(FOPA2)2(φ1) The phases in the phase sensitive FOPA3 and FOPA2 processes.
To facilitate the next comparison, let us let G1＝G2＝G3While from previous analysis we also know that the phase uncertainty of only the idler of the output four beams is minimal, we here consider the phase uncertainty of only the two idlers. While the phase uncertainty can be given by the error transfer equation
Wherein the content of the first and second substances,
in order to output the intensity noise of the light field,
is the intensity-versus-phase partial derivative of the output light field. The numbers of particles of the output-side idler light of the available FOPA3 and FOPA2 processes from (1-1) and (1-2), respectively, are expressed as
Wherein G-G is 1,
is the number of particles of injected light.
The idler phase uncertainty of the FOPA3 and FOPA2 process outputs available from equations (1-3) and (1-4), respectively
Wherein the content of the first and second substances,
respectively, the total number of photons inside the two non-linear interferometers.
After the above description of the nonlinear interferometric two-parameter sensing principle, to demonstrate the quantum enhancement capability of this scheme, it was compared with the phase uncertainty of the corresponding linear interferometric two-parameter sensor (structure as in fig. 3). The process of fig. 3 is described in detail as follows: injected light
The four beams of light after passing through a linear interferometric type two parameter (temperature and strain) sensor can be described as respectively
Therefore output light
And
can be expressed as
Wherein the content of the first and second substances,
is the number of particles of injected light. The output light can be obtained from (1-3), (1-7) and (1-8)
And
respectively, of
Wherein the content of the first and second substances,
respectively the total number of photons inside the two linear interferometers.
We next need to analyze the magnitude of the output light phase uncertainty for two different types of interferometers. When T is known from (1-5) and (1-6)1＝0，T2＝1，φ2＝π(T1＝1，T2＝0，φ1Pi), FOPA3(FOPA2) outputs light
The phase uncertainty takes the minimum value, but at the moment, FOPA2(FOPA3) only has one injection respectively, interference does not occur, and double-parameter sensing cannot be realized, so that T is selected1＝T20.5 is taken as the working parameter of the nonlinear interferometer. At this time Ns＝Ns1＝Ns2And when phi is equal to phi2＝φ1When the temperature of the water is higher than the set temperature,
from the same reason, the linear interferometers are the same as those known from (1-9) and (1-10) that is when T is1＝T2When equal to 0.5, Ns＝Ns1＝Ns2And when phi is equal to phi2＝φ1When the temperature of the water is higher than the set temperature,
therefore, we compare here mainly at T1＝T2FOPA3(FOPA2) outputs light when 0.5 ═ 0.5
And linear interferometer output light
The magnitude of the phase uncertainty. When G is set to 3, Ns6250, and phi2＝φ1When the FOPA3(FOPA2) outputs light
Phase uncertainty and linear interferometer output light
The variation of the phase uncertainty with phase phi is plotted in fig. 4. From FIG. 4, it can be seen that the temperature is around π
Phase uncertainty is always less than
The phase uncertainty, and both phase uncertainties, take a minimum at pi.
To show the effect of total photon number inside the interferometer on phase uncertainty, we locked the phaseφ＝φ2＝φ1Pi, to output FOPA3(FOPA2) light
Phase uncertainty and linear interferometer output light
Phase uncertainty to total number of photons N inside interferometersThe dependencies of (2) are plotted in fig. 5. From FIG. 5, it can be seen that FOPA3(FOPA2) outputs light
Phase uncertainty is always better than the linear interferometer output light
Phase uncertainty 1.02dB, and FOPA3(FOPA2) outputs light
Phase uncertainty with total particle number N inside the non-linear interferometersIs increased and decreased.
In a two parameter sensor, changes in strain and temperature result in changes in the length and refractive index of the fiber, which in turn results in changes in phase uncertainty. The specific principle is as follows: the phase change caused by temperature change in a single mode fiber of length L is given by the following equation
Wherein λ is the transmission wavelength of light in the optical fiber, n is the refractive index of the fiber core, T is the temperature of the optical fiber, and T is the temperature of the optical fiber0Is the initial temperature of the fiber. And because of
(αTThe thermal expansion coefficient of the core). Thus, it can be obtained
The change in phase caused by a change in strain in a single mode optical fibre of length L is given by the following equation
Wherein the content of the first and second substances,
for phase changes caused by changes in the fiber geometry length,
for phase changes caused by changes in the transverse index of the core,
phase changes caused by changes in the radius of the core; k is 2 pi n/lambda is the fiber propagation constant, Δ k is the variation of the fiber propagation constant, Δ n is the variation of the core transverse refractive index, a is the core radius, and Δ a is the variation of the core radius. In single mode optical fiber
Is far less than
And
so it can be discarded. Then
For single mode fibers, the relationship between the change in refractive index and strain is given by
Wherein the content of the first and second substances,1，2(1＝2) Is the transverse strain of the fiber,. DELTA.L/L is the longitudinal strain of the fiber, P11And P12Is the elasto-optic coefficient of the fiber.
Thus, it is obtained from (1-14) and (1-15)
Wherein v ═ f1And/is the Poisson's ratio constant.
We can define the minimum resolvable temperatures and strains from (1-5), (1-6), (1-12) and (1-16) as
For convenience of comparison FOPA3(FOPA2) output light
And linear interferometer output light
We set the minimum resolvable temperature (strain) at NsSome parameters under 6250 for T at the initial temperature0For fused silica fiber with length L of 1cm at 25 deg.C, n is 1.458, P11＝0.126，P12＝0.27，v＝0.17，αT＝5.5×10-7/° c; for an idler light with a transmission wavelength of 1534nm,
can be approximately 8.11 multiplied by 10-6/° c (at 1550 nm). Outputs FOPA3(FOPA2) light
And linear interferometer output light
Minimum resolvable temperature (strain) with phase phi2(φ1) The variation of (2) is shown in FIG. 6 (7). From FIG. 6(7), it can be obtained that FOPA3(FOPA2) outputs light at around π
Is always better than the linear interferometer output light
And are all at phi2＝π(φ1Pi) to take the minimum value.
To show the effect of the total number of photons inside the interferometer on the minimum resolvable temperature (strain), we locked the phase phi2＝π(φ1Pi), the FOPA3(FOPA2) outputs light
And linear interferometer output light
Minimum resolvable temperature (strain) of (N) versus total number of photons N inside the interferometersThe dependency relationships of (2) are shown in FIG. 8 (9). From FIG. 8(9), FOPA3(FOPA2) output light
Is always better than the linear interferometer output light
Minimum resolvable temperature (strain) 1.02 dB. Meanwhile, we can increase the total photon number N in the nonlinear interferometersTo reduce FOPA3(FOPA2) output light
Minimum resolvable temperature (strain). To further highlight the advantages of the non-linear interferometric temperature strain sensor, the phase is locked at φ2＝π(φ1Pi), FOPA3(FOPA2) outputs light
And linear interferometer output light
The phase uncertainty of (2) is plotted in fig. 10(11) as a function of the temperature (strain) to be measured. From FIG. 10(11), FOPA3(FOPA2) output light
Output light of relatively linear interferometer
The change rate with the temperature (strain) to be measured is higher, and the temperature change is lower than 1.04 ℃ (8.15 multiplied by 10)-6Strain) with better minimum detectable temperature (strain) accuracy. Thus outputting light using FOPA3(FOPA2)
Higher sensitivity of dual parameter (temperature and strain) sensing can be achieved.
The above-mentioned examples, which have been provided to illustrate the objects, technical solutions and advantages of the present invention, should be understood that they are merely exemplary and not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (4)
1. A nonlinear interference type double-parameter sensor based on a correlation injection scheme is characterized by comprising three beams of pump light, a beam of seed light, three optical fiber parametric amplifiers and two beam splitters; the connection mode is as follows: the first optical fiber parametric amplifier is injected into the first optical fiber parametric amplifier together with the seed light, the first optical fiber parametric amplifier plays a role of beam splitting, the generated associated light beams are respectively divided into two signal beams and two idler frequency beams after passing through a beam splitter, one of the idler frequency light beams is applied with a first parameter to be measured and then is injected into a second optical fiber parametric amplifier together with one of the signal light beams and the pump light beam, the rest idle frequency light beam is applied with the second parameter to be measured and then injected into a third optical fiber parametric amplifier together with the other signal light beam and the pump light beam, the second and the third optical fiber parametric amplifiers play a beam combining role, the output end signal light and the idler frequency light of the second and the third optical fiber parametric amplifiers are connected into an oscilloscope through a photoelectric detector, detecting the phase uncertainty of the two beams of idler frequency light so as to realize the sensing of the double-parameter change of the first parameter to be detected and the second parameter to be detected; the first parameter to be measured and the second parameter to be measured are physical quantities capable of changing the phase of the light beam in the optical fiber.
2. The nonlinear interferometric two-parameter sensor based on a correlated injection scheme of claim 1, wherein: the first, second and third optical fiber parametric amplifiers are composed of two coarse wavelength division multiplexers and a dispersion shift optical fiber in the middle, and simultaneously, the pump light is 1550nm in wavelength and located in an anomalous dispersion area of the dispersion shift optical fiber, so that the phase matching condition generated in the four-wave mixing process in the optical fiber is met.
3. The nonlinear interferometric two-parameter sensor based on a correlated injection scheme of claim 1, wherein: the first parameter to be measured is strain, and the second parameter to be measured is temperature.
4. The nonlinear interferometric two-parameter sensor based on a correlated injection scheme of claim 1, wherein: the physical quantity that can change the phase of the light beam in the optical fiber can be a magnetic field, a refractive index, acceleration, vibration or the like.
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