AU2020103314A4 - A dual F-P cavity and a Mach-Zehnder interferometer combined interferometer - Google Patents
A dual F-P cavity and a Mach-Zehnder interferometer combined interferometer Download PDFInfo
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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
- G02F1/225—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 in an optical waveguide structure
- G02F1/2252—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 in an optical waveguide structure in optical fibres
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/02—Optical fibres with cladding with or without a coating
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/02057—Optical fibres with cladding with or without a coating comprising gratings
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/02057—Optical fibres with cladding with or without a coating comprising gratings
- G02B6/02076—Refractive index modulation gratings, e.g. Bragg gratings
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
- G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
- G02B6/29346—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means operating by wave or beam interference
- G02B6/2935—Mach-Zehnder configuration, i.e. comprising separate splitting and combining means
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
- G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
- G02B6/29346—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means operating by wave or beam interference
- G02B6/29356—Interference cavity within a single light guide, e.g. between two fibre gratings
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
- G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
- G02B6/29346—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means operating by wave or beam interference
- G02B6/29358—Multiple beam interferometer external to a light guide, e.g. Fabry-Pérot, etalon, VIPA plate, OTDL plate, continuous interferometer, parallel plate resonator
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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
- G02F1/225—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 in an optical waveguide structure
-
- 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
- G02F1/225—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 in an optical waveguide structure
- G02F1/2257—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 in an optical waveguide structure the optical waveguides being made of semiconducting material
-
- 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
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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
- G02F1/213—Fabry-Perot type
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Abstract
The present invention provides a dual F-P cavity and a Mach-Zehnder interferometer combined
interferometer, consisting a combination of two fiber F-P interferometers and a fiber Mach
Zehnder interferometer. The Mach-Zehnder interferometer comprises a single-core polarization
maintaining fiber and a weld-mounted dual-core polarization maintaining fiber with weld
coupling at each end. The two fiber F-P interferometers are a dual F-P cavity comprising two
Bragg grating pairs etched on each of the two cores of the weld-mounted dual-core polarization
maintaining fiber, and each F-P cavity is embedded in each arm of the Mach-Zehnder
interferometer. The advantages of the invention are: compared with the traditional integrated
Mach-Zehnder interferometer, its measurement sensitivity is improved. The use of the
polarization maintaining fiber to form the interferometer, solves stability problems caused by
random changes in polarization state in conventional interferometers. Both arms of the Mach
Zehnder interferometer are in the same fiber, improving the temperature stability of the
interferometer.
1/2
DRAWINGS
13
FIG.1
4 5 7 6 11 9 12 815
13 10 14
FIG 2
4 5 7 6 11 9 12 8I
13 10 14
FIG. 3
Description
1/2 DRAWINGS
13
FIG.1
4 5 7 6 11 9 12 815
13 10 14 FIG 2
4 5 7 6 11 9 12 8I
13 10 14 FIG. 3
A dual F-P cavity and a Mach-Zehnder interferometer combined interferometer
[0001] The invention relates to an interferometer with combination of fibers, which belongs to
the optical fiber technology field.
[0002] Optical fiber Mach-Zehnder interferometer in optical fiber communication, optical fiber
sensing and other fields have a very wide range of applications. Ordinary optical fiber Mach
Zehnder interferometer is the use of a 3dB fiber coupler that emits two beams of equal intensity
light using the semiconductor laser, and respectively goes into two independent optical fiber
interference arm for transmission. The light travel a distance in the two arms and then pass
through a 3dB coupler to interfere. The interfering light signal passes through a photoelectric
detector and is converted into an electrical signal that is amplified to detect the interfering light
signal, as shown in the patent (CN 1251906A). Since the optical transmission characteristics in
both reflector arms of an optical fiber can be affected by external conditions such as temperature
and pressure, an optical fiber Mach-Zehnder interferometer can be used to measure physical
quantities such as fiber strain and temperature. This interferometer uses two separate optical
transmission channels for tuning and matching the optical path. Since it does not have a common optical path structure, it is susceptible to environmental factors (such as temperature and vibration), resulting in inconsistent changes in the optical path of the two optical paths, which affects the demodulation of the sensor signal, reduces the signal demodulation sensitivity of the interferometer, and decreases the accuracy of the measurement. This means that the Mach
Zehnder interferometer is not sufficiently sensitive to measurement.
[0003] Of all the interferometers, F-P interferometers have reasonably high detection sensitivity
because of the repeated superposition of multiple reflections to form a very fine reflective or
transmissive spectrum. For optical fiber F-P interferometers (US 5682237), two reflective
surfaces are created within the fiber to form a microcavity. When a coherent light beam is
incident along the optical fiber into the microcavity, the light is reflected at the two ends of the
microcavity and returns along the original path, where it meets and causes interference. When an
external parameter is applied to the microcavity in a certain way, the phase difference changes,
resulting in a corresponding change in the light intensity of the interferometric output reflected,
which enables the sensing measurement. As the medium in the cavity is the optical fiber itself, so
the loss is small, the cavity length can be made very large, from a few centimeters to a few
meters; two optical fiber gratings with the same reflection spectrum can be also written into the
cores of the optical fiber, thus constituting an optical fiber F-P interferometer. Yunjiang Rao and
many others in China has also proposed many structures of optical fiber F-P interferometers and
their fabrication methods (CN101055196, CN101034007).
[0004] The above two interferometers are usually not sufficiently integrated, Tingyun Wang, et
al. (Chinese patent CN 101464539A) proposed a Mach-Zehnder interferometer based on a
coaxial optical fiber, the interferometer consists by connecting in turns of a single-mode input
optical fiber, a coaxial optical fiber, a single-mode optical fiber, a coaxial optical fiber and a
single-mode output optical fiber to form a Mach-Zehnder interferometer in a single optical fiber.
Libo Yuan, et al. (Chinese patent CN 101105555A) also proposed a single optical fiber Mach
Zehnder interferometer, using a dual-core optical fiber to achieve, the interferometer integration
greatly improved, but the measurement sensitivity was not improved, and the random changes in polarization state resulting in the instability of the interferometric signal was not resolved.
[0005] The objective of the invention is to provide a dual F-P cavity and a Mach-Zehnder interferometer combined interferometer that is further enhanced in the sensitivity of the interferometer, which in the same time can solve the stability problem of interferometers.
[0006] The objective is achieved as follows:
[0007] It is composed by the combination of two fiber F-P interferometers and a fiber Mach Zehnder interferometer. The Mach-Zehnder interferometer is composed of a single-core polarization maintaining fiber and a fusion-mounted dual-core polarization maintaining fiber with fuse-coupling at each end. The two fiber F-P interferometers are a dual F-P cavity consisting of two Bragg grating pairs etched on each of the two cores of a fusion-mounted dual core polarization maintaining fiber, and each F-P cavity is embedded in each arm of the Mach Zehnder interferometer.
[0008] The invention can also include:
[0009] 1. The weld-mounted dual-core polarization maintaining fiber is photosensitive, the center is an air hole with symmetrical cores partially suspended in the air-hole and partially embedded in the cladding; the two cores are elliptical in shape and both cores have the same polarization axis orientation.
[0010] 2. The two fiber F-P interferometers are composed of four same reflective center
wavelength-two pairs of Bragg fiber grating.
[0011] 3. The fiber grating pairs in the same F-P cavity have the same reflectance to the fiber
grating, and the fiber grating pairs in different F-P cavities have different reflectance to the fiber
grating.
[0012] 4. The reflectance of the fiber grating is between 1% and 99%.
[0013] 5. The Mach-Zehnder interferometer consists of a single-core polarization maintaining
fiber and a weld-mounted dual-core polarization maintaining fiber that are separately welded and
coupled, meaning that the end of the single-core polarization maintaining fiber and the end of the
weld-mounted dual-core polarization maintaining fiber are welded directly by a polarization
maintaining fiber welder to complete the coupling of the weld, or the welded fiber is heated and
tapered at the welded joint of the two fibers by a taper machine to form a paracone structure at
the weldedjoint to achieve a 1x2 beam splitting, and the other end of the weld-mounted dual
core polarization maintaining fiber and the single-core polarization maintaining fiber form a
paracone structure to achieve the function of a 2x1 combiner.
[0014] 6. The weld-mounted dual-core polarizing maintaining fiber cores are erbium-doped to
achieve the enhancement and amplification of signals.
[0015] FIG. 2 gives the basic structure of the interferometer of the present invention, consisting
of a combination of two optical fiber F-P interferometers 9, 10 and an optical fiber Mach
Zehnder interferometer. The Mach-Zehnder interferometer is structured by welding and coupling
the two ends of the single-core polarization maintaining fiber 5 and the dual-core polarization maintaining fiber 6. The two optical fiber F-P interferometers 9 and 10 are a dual F-P cavity comprising dual Bragg fiber grating pairs 11, 12 and 13, 14 embedded on the weld-mounted double-core polarization maintaining fiber 6, and are embedded in the two arms of the Mach
Zehnder interferometer, respectively. Optical fiber F-P interferometers 9 and 10 can have
different cavity lengths and can be located in different positions on the fiber axis. The working
principle of the interferometer of the present invention is: the light emitted from the light source
4 enters the single-core polarization maintaining fiber 5, after passing the paracone structure 6
formed by the welding of the single-core fiber 5 and the double core fiber 6, and this realize the
beam splitting function of the transmitted light. The light from one arm passes through the F-P
cavity 9 formed by the fiber grating pair 11 and 12, and the light from the other arm passes
through the F-P cavity 10 formed by the fiber grating pair 13 and 14 with the same
characteristics as fiber grating pair 11 and 12, i.e., the two beams of interference light pass
through the two arms of Mach-Zehnder interferometer, and then pass through the cone 8 where
the dual-core fiber 6 and the single-core fiber 5 are fused, interfere in the cone and then the
interference light is received by the detector 15. The phase difference between the two arms of
the Mach-Zehnder interferometer can be changed by adjusting the length of the two F-P cavities.
For greater contrast in the interferometric signal, the spectral ratios of the two arms of the
interferometer should be as uniform as possible, and the reflectance of the grating pairs should
be the same. This configuration can be used for either transmissive or reflective measurements.
For reflective measurements, it the equivalence of a dual F-P cavity and a Michelson
interferometer combined interferometer
[0016] In order to further improve the sensitivity of the interferometer and to solve the stability
problem of the interferometer, the present invention combines the structure of an integrated
optical fiber Mach-Zehnder interferometer and proposes to construct F-P cavities in the two
interferometer arms of the Mach-Zehnder interferometer, and forms a dual F-P cavity and a
Mach-Zehnder interferometer combined interferometer in one same polarization maintaining
fiber.
[0017] The advantages of the invention are: 1. Compared with the traditional integrated Mach Zehnder interferometer, the measurement sensitivity can be improved due to the combination of an F-P cavity structure. 2. The stability problems caused by random changes in polarization state of conventional interferometers can be solved by using a polarization maintaining fiber as an interferometer. 3. Both arms of the Mach-Zehnder interferometer are in the same fiber, improving the temperature stability of the interferometer.
[0018] The invention has the advantages of simple manufacturing process, single optical fiber integration, high sensitivity, good polarization maintaining characteristics, and high temperature stability.
[0019] FIG. 1 is a cross-sectional view of the present invention based on a weld-mounted core based dual-core polarization maintaining fiber.
[0020] FIG. 2 shows a dual F-P cavity and a Mach-Zehnder interferometer combined interferometer of equal-arms.
[0021] FIG. 3 shows the equal-arms dual F-P cavity combined interferometer of the present invention at different positions in the fiber axis.
[0022] FIG. 4 shows a dual F-P cavity and a Mach-Zehnder interferometer combined interferometer with unequal-arms.
[0023] The invention is described in more detail below in conjunction with the embodiments and
the drawings:
[0024] FIG. 1 shows a cross-sectional view of the weld-mounted-core dual-core polarization
maintaining fiber; the two cores 1 have the same polarization axis orientation, the center of the
fiber is an air hole 3, and the two cores 1 are symmetrically embedded in the inner wall of the
cladding 2, each core 1 is partially in the cladding and partially exposed in the air hole 3.
[0025] FIG. 2 is a schematic diagram of the embodiment 1 of the invention, where the light
emitted from the light source 4 enters the single-core polarization maintaining fiber 5, using the
paracone structure 6 formed by the welding of the single-core fiber 5 and the double core fiber 6
to realize the beam splitting function of the transmitted light. The light from one arm passes
through the F-P cavity 9 formed by the fiber grating pair 11 and 12, and the light from the other
arm passes through the F-P cavity 10 formed by the fiber grating pair 13 and 14 with the same
characteristics as fiber grating pair 11 and 12. The two interference light pass through the two
arms of Mach-Zehnder interferometer, respectively, and then pass through the cone 8 where the
dual-core fiber 6 and the single-core fiber 5 are fused, to interfere in the cone and then the light
after two interferences is received by the detector 15. After fusion of the optical fibers, they need
to be cleaned and then encapsulated and cured with epoxy resin. The two F-P cavities 9 and 10 in
the above structure have the same cavity length, that is, a dual F-P cavity and a Mach-Zehnder
interferometer combined interferometer with equal-arms. The fiber grating in this embodiment
can be written using a phase mask method, and the gratings 11, 13 can be written simultaneously
at one time, while the gratings 12, 14 can also be written simultaneously.
[0026] FIG. 3 is a schematic diagram of the structure of Embodiment 2 of the present invention, in which the structure of the combined interferometer is the same as that of Embodiment 1, except that the two F-P cavities are at different positions in the dual-core fiber axis, and the fiber gratings 11-14 are written one by one, respectively.
[0027] FIG. 4 is a schematic diagram of the structure of Embodiment 3 of the present invention, in which the structure of the combined interferometer is the same as that of Embodiment 1, except that the two F-P cavities 9 and 10 have different cavity lengths. That is, the optical fiber gratings 11 and 13 are written simultaneously, while the optical fiber gratings 12 and 14 are written one by one.
[0028] With the above embodiments, it can be seen that the dual F-P cavity and a Mach-Zehnder interferometer combined interferometer of the present invention has the advantages of high integration, good polarization maintaining characteristics and high temperature stability. It can be used for strain, bending and biochemical sensing.
Claims (4)
1. A dual F-P cavity and a Mach-Zehnder interferometer combined interferometer,
consisting a combination of two fiber F-P interferometers and a fiber Mach-Zehnder
interferometer. Its characteristics are: the Mach-Zehnder interferometer is composed of a single
core polarization maintaining fiber and a weld-mounted dual-core polarization maintaining fiber
with weld-coupling at each end. The two fiber F-P interferometers are a dual F-P cavity
consisting of two Bragg grating pairs etched on each of the two cores of a weld-mounted dual
core polarization maintaining fiber, and each F-P cavity is embedded in each arm of the Mach
Zehnder interferometer. The weld-mounted dual-core polarization maintaining fiber is
photosensitive, the center is an air hole with symmetrical cores partially suspended in the air
hole and partially embedded in the cladding; the two cores are elliptical in shape and both cores
have the same polarization axis orientation.
2. As claimed in claim 1, a dual F-P cavity and a Mach-Zehnder interferometer combined
interferometer, its characteristics also include: (1) Two fiber F-P interferometers are composed of
four same reflective center wavelength-two pairs of Bragg fiber grating. (2) The fiber grating
pairs in the same F-P cavity have the same reflectance to thefiber grating, and the fiber grating
pairs in different F-P cavities have different reflectance to the fiber grating. (3) The reflectance
of the fiber grating is between 1% and 99%.
3. As claimed in claim 1, a dual F-P cavity and a Mach-Zehnder interferometer combined
interferometer, the Mach-Zehnder interferometer consists of a single-core polarization
maintaining fiber and a weld-mounted dual-core polarization maintaining fiber that are
separately welded and coupled, meaning that the end of the single-core polarization maintaining
fiber and the end of the weld-mounted dual-core polarization maintaining fiber are welded
directly by a polarization maintaining fiber welder to complete the coupling of the weld, or the
welded fiber is heated and tapered at the welded joint of the two fibers by a taper machine to form a paracone structure at the welded joint to achieve a 1x2 beam splitting, and the other end of the weld-mounted dual-core polarization maintaining fiber and the single-core polarization maintaining fiber form a paracone structure to achieve the function of a 2x1 combiner.
4. As claimed in claim 1, a dual F-P cavity and a Mach-Zehnder interferometer combined
interferometer, it is characterized by: the weld-mounted dual-core polarizing maintaining fiber
cores are erbium-doped.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113959606A (en) * | 2021-10-20 | 2022-01-21 | 南京信息工程大学 | Hybrid transverse pressure sensor based on cascade enhancement vernier effect |
| CN114088664A (en) * | 2021-11-16 | 2022-02-25 | 哈尔滨工程大学 | SPR optical fiber refractive index sensor, preparation method and application |
-
2020
- 2020-11-09 AU AU2020103314A patent/AU2020103314A4/en not_active Ceased
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113959606A (en) * | 2021-10-20 | 2022-01-21 | 南京信息工程大学 | Hybrid transverse pressure sensor based on cascade enhancement vernier effect |
| CN113959606B (en) * | 2021-10-20 | 2023-09-26 | 南京信息工程大学 | Mixed type transverse pressure sensor based on cascade enhancement vernier effect |
| CN114088664A (en) * | 2021-11-16 | 2022-02-25 | 哈尔滨工程大学 | SPR optical fiber refractive index sensor, preparation method and application |
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