CN107806981B - Measuring device for beat length of polarization maintaining optical fiber - Google Patents
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- G—PHYSICS
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/30—Testing of optical devices, constituted by fibre optics or optical waveguides
- G01M11/33—Testing of optical devices, constituted by fibre optics or optical waveguides with a light emitter being disposed at one fibre or waveguide end-face, and a light receiver at the other end-face
- G01M11/331—Testing of optical devices, constituted by fibre optics or optical waveguides with a light emitter being disposed at one fibre or waveguide end-face, and a light receiver at the other end-face by using interferometer
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/30—Testing of optical devices, constituted by fibre optics or optical waveguides
- G01M11/33—Testing of optical devices, constituted by fibre optics or optical waveguides with a light emitter being disposed at one fibre or waveguide end-face, and a light receiver at the other end-face
- G01M11/336—Testing of optical devices, constituted by fibre optics or optical waveguides with a light emitter being disposed at one fibre or waveguide end-face, and a light receiver at the other end-face by measuring polarization mode dispersion [PMD]
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Abstract
The invention discloses a measuring device for beat length of a polarization maintaining optical fiber, which is characterized by comprising a wide-spectrum light source, an optical fiber polarizer, a frequency spectrograph and a computer, wherein the wide-spectrum light source enters a high-birefringence polarization maintaining optical fiber to be measured through the optical fiber polarizer; the high birefringence polarization maintaining optical fiber to be tested is connected with the other end of the optical fiber polarizer in a 45-degree welding manner, so that the connection part is very tight and firm, no gap is formed, and the stability is very high; the device has the characteristics of large treatment capacity, convenience, practicability and the like.
Description
Technical Field
The invention relates to the field of measurement of beat length of a polarization maintaining optical fiber, in particular to a device for measuring beat length of a polarization maintaining optical fiber.
Background
The polarization maintaining optical fiber transmits linearly polarized light and is widely applied to various fields of civil economy, such as aerospace, aviation, navigation, industrial manufacturing technology, communication and the like. In an interference type optical fiber sensor based on optical coherent detection, the polarization maintaining optical fiber is used to ensure that the linear polarization direction is unchanged, and the coherent signal-to-noise ratio is improved, so that high-precision measurement of physical quantity is realized. The polarization maintaining fiber is used as one special fiber and is used mainly in fiber gyro, fiber hydrophone and other sensors and fiber communication system, DWDM, EDFA and other fiber communication systems.
The high birefringence polarization maintaining fiber has wide application in the fields of fiber optic gyroscopes, fiber optic current transformers, polarization maintaining devices and the like. In these applications, the polarization maintaining performance of the polarization maintaining fiber is the key to determine its application, and the beat length is generally used to measure the polarization maintaining performance of the polarization maintaining fiber. It reflects the magnitude of the difference of the intrinsic refractive indexes of two polarization eigen axes of the polarization maintaining fiber, namely the birefringence of the polarization maintaining fiber.
The polarization fiber beat length is measured mainly by methods such as a twisting method, a pressure method, an electro-optical or magneto-optical modulation method, a light polarization method, a shearing method, a polarization mode dispersion method, a prism coupling method, a Rayleigh scattering method, a wavelength scanning method, a light frequency domain reflectometer and the like. The invention provides a device for measuring beat length of a polarization maintaining optical fiber, which is used for reducing polarization maintaining performance caused by structural defects generated in the optical fiber in the drawing process of the polarization maintaining optical fiber.
Disclosure of Invention
The invention aims to solve the technical problem of the existing polarization maintaining optical fiber that the polarization maintaining performance is difficult to detect in the working process, and provides a device for measuring the beat length of the polarization maintaining optical fiber, thereby solving the problem.
In order to solve the technical problems, the invention provides the following technical scheme:
the invention relates to a device for measuring beat length of a polarization maintaining optical fiber, which comprises a wide-spectrum light source, an optical fiber polarizer, a frequency spectrograph and a computer, wherein the wide-spectrum light source enters a high-birefringence polarization maintaining optical fiber to be measured through the optical fiber polarizer, the tail end of the high-birefringence polarization maintaining optical fiber to be measured is connected with a polarization analyzer, an optical carrier microwave signal on an electro-optical modulator of an electro-optical modulator at the signal output end of the polarization analyzer is incident on a high-speed photoelectric detector after passing through a dispersion optical fiber, a microwave signal on the high-speed photoelectric detector is amplified through low noise and then passes through a microwave power divider, a part of the microwave signal is injected into the electro-optical modulator, and a part of the microwave signal reaches.
As a preferred technical scheme of the invention, the high birefringence polarization maintaining fiber to be tested is connected with the optical fiber polarizer in a fusion welding mode, the fusion welding angle is 45 degrees, so that the connection part is very tight and firm, and no gap is generated.
As a preferred technical scheme of the invention, the photoelectric oscillator is composed of an electro-optical modulator, a dispersion optical fiber, a high-speed photoelectric detector, a low-noise amplifier and a microwave power divider, and an optical signal is changed into a microwave signal, so that the microwave signal is digitalized and is favorable for analysis, calculation and recycling.
As a preferred technical scheme of the invention, the wide-spectrum light source can adopt a Gaussian or rectangular light source as the emission light source, so that the selectivity of the emission light source is higher.
The invention has the following beneficial effects: the invention relates to a device for measuring beat length of a polarization maintaining optical fiber, which forms a Mach-Zehnder interferometer by a high birefringence polarization maintaining optical fiber to be measured and an analyzer together, so that after a wide-spectrum light source passes through the interferometer, when the optical path difference of two arms of the interferometer is within the coherent range of the light source, interference fringes are generated at the output end of the interferometer, and the interference fringes are a sine comb-shaped spectrum on a frequency domain; the high birefringence polarization maintaining fiber to be tested is tightly connected with the optical fiber polarizer by fusion splicing, so that no gap is formed and the high birefringence polarization maintaining fiber is very stable; the problems of complex assembly, easy falling, unstable connection and poor appearance can be avoided. The photoelectric oscillator loop is formed by the electro-optical modulator, the dispersion optical fiber, the high-speed photoelectric detector, the low-noise amplifier and the microwave power divider, optical signals are converted into microwave signals, the central frequency of the output microwave signals is measured, the microwave signals are subjected to large-scale data conversion, manpower, material resources and time are greatly saved, and accuracy is improved.
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The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention.
In the drawings:
FIG. 1 is a schematic diagram of the framework of the system of the present invention.
Reference numbers in the figures: 101. a broad spectrum light source; 102. an optical fiber polarizer; 103. a high birefringence polarization maintaining fiber to be measured; 104. an analyzer; 105. an electro-optic modulator; 106. a dispersive optical fiber; 107. a high-speed photodetector; 108. low noise is put; 109. a microwave power divider; 201. a frequency spectrograph; 202. and (4) a computer.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
In the description of the present invention, it should be noted that the terms "vertical", "upper", "lower", "horizontal", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Example (b): as shown in fig. 1, the present invention provides a device for measuring beat length of polarization maintaining fiber, which is characterized in that the device comprises a wide spectrum light source 101, a fiber polarizer 102, a spectrometer 201 and a computer 202; the wide-spectrum light source 101 enters a high-birefringence polarization-maintaining optical fiber 103 to be detected through an optical fiber polarizer 102, the signal output end of the high-birefringence polarization-maintaining optical fiber 103 to be detected is connected with an analyzer 104, the high-birefringence polarization-maintaining optical fiber 103 to be detected and the analyzer 104 jointly form a Mach-Zehnder interferometer, the signal output end of the Mach-Zehnder interferometer is provided with an electro-optical modulator 105, an optical-carried microwave signal on the electro-optical modulator 105 is incident on a high-speed photoelectric detector 107 after passing through a dispersion optical fiber 106, the high-speed photoelectric detector 107 converts the optical signal into a microwave signal and amplifies the microwave signal through a low-noise amplifier 108, the output end of the low-noise amplifier 108 is connected with a microwave power divider 109, the microwave power divider 109 injects a part of the microwave signal into the electro-optical modulator 105, meanwhile, the other part of the microwave signal.
The high birefringence polarization maintaining fiber 103 to be measured is connected with the fiber polarizer 102 in a fusion mode, the fusion angle is 45 degrees, so that the connection part is very tight and firm, and no gap is generated; an electro-optical oscillator is composed of an electro-optical modulator 105, a dispersion optical fiber 106, a high-speed photoelectric detector 107, a low-noise amplifier 108 and a microwave power divider 109, and the loop input end of the electro-optical oscillator is connected with the output end of the Mach-Zehnder interferometer to convert optical signals into microwave signals, so that the microwave signals are digitalized and are favorable for analysis, calculation and recycling; the broad spectrum light source 101 may employ a gaussian or rectangular light source as the emission light source, so that the selectivity of the emission light source is higher.
The principle of the measurement method is that the mode birefringence of the high birefringence polarization maintaining fiber 103 to be measured makes the optical path difference of two paths of light propagating in the high birefringence polarization maintaining fiber 103 to be measured different, the central frequency of the microwave signal output by the photoelectric oscillator is related to the optical path difference, and the central frequency of the microwave signal is determined according to the central frequency of the microwave signalThe beat length of the high birefringence polarization maintaining fiber 103 to be measured can be obtained. The beat length of the wide-spectrum light source is LpAfter the high birefringence polarization maintaining fiber 103 to be measured is obtained, the high birefringence polarization maintaining fiber 103 to be measured with a proper length is selected so that two paths of light transmitted on two polarization local oscillation axes of the high birefringence polarization maintaining fiber 103 to be measured meet interference conditions at the end of the high birefringence polarization maintaining fiber 103 to be measured to interfere, and then the output of interference fringes can be expressed as:
wherein A is the visibility of the output interference fringe of the interferometer, and Delta omega is the frequency interval of the output interference fringe when the optical path difference of different interferometers exists,
for phase drift of interferometers, ω0The center circle frequency of the laser. Δ ω can be expressed as:
Δω＝2πcLp/λ0l (2)
where c is the speed of light, λ0Is the central wavelength of the wide-spectrum light source 101, and l is the length of the high-birefringence polarization-maintaining fiber 103 to be measured. The free spectral range of the interferometer can be expressed as:
the output light of the interference is wavelength dependent, and its electric field can be characterized as:
E(t)＝∫E(ω)ejωtdω (4)
the optical power spectral density of the broad spectrum light source 101 can be expressed as:
T(ω)＝|E(ω)|2 (5)
after the interference fringes output by the interferometer pass through the electro-optical modulator 105, each frequency component E (ω) of the optical spectrum is modulated, and a microwave signal with a frequency ξ is generated by the optoelectronic oscillator loop, and the optical field output by the electro-optical modulator 105 can be represented as:
E(ω)＝ejωt(1+ejξt+e-jξt) (6)
the dispersive optical fiber 106 is used as a delay line in the optoelectronic oscillator, and the electric field transfer function of the delay line can be expressed as:
H(ω)＝|H(ω)|e-jφ(ω) (7)
φ (ω) is the phase introduced by the delay of the dispersive fiber 106, which can be expressed as:
in the formula, τ (ω)0) Has a center frequency of omega0Group delay of time, β is the dispersion of the dispersive optical fiber 106, and has a unit of ps2The/km, β can be expressed as:
where D (ps/km/nm) is the dispersion coefficient of the dispersive optical fiber 106, λ0A broad spectrum light source 101 wavelength.
The optoelectronic oscillator response function is obtained according to equation (5) -9 as:
wherein
It can be seen that the center frequency of the microwave signal output by the optoelectronic oscillator can be expressed as:
from this, the beat length of the high birefringence polarization maintaining fiber 103 to be measured is:
from the above formula, the beat length of the high birefringence polarization maintaining fiber 103 to be measured can be obtained according to the center frequency of the microwave signal output from the optoelectronic oscillator, the center wavelength of the wide spectrum light source 101, the dispersion coefficient and length of the dispersion fiber 106, and the length of the high birefringence polarization maintaining fiber 103 to be measured. From the equation (12), if the beat length of the high birefringence polarization maintaining fiber 103 to be measured is 1m, the dispersion coefficient of the dispersion fiber 106 is-150 ps/km/nm, the length of the dispersion fiber 106 is 1km, and the central wavelength of the light source is 1550nm, the beat length measurement resolution can reach 0.4 mm. Since the dispersion coefficient of the dispersive fiber 106 is typically several fixed values, an increase in beat length measurement resolution can be achieved by increasing the length of the dispersive fiber 106.
The working flow of the high birefringence polarization maintaining optical fiber beat length measuring device is as follows:
after power-up, the electro-optic modulator 105 driver board automatically controls the intensity type optical modulator to operate at a linear operating point by a program. After the working point of the electro-optical modulator 105 is determined, the center frequency of the microwave signal output by the electro-optical oscillator is determined. The beat length of the high birefringence polarization maintaining fiber 103 to be measured can be obtained from the equation (12).
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that various changes, modifications and substitutions can be made without departing from the spirit and scope of the invention as defined by the appended claims. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (3)
1. A device for measuring beat length of a polarization maintaining optical fiber is characterized by comprising a wide spectrum light source (101), an optical fiber polarizer (102), a frequency spectrograph (201) and a computer (202), wherein the wide spectrum light source (101) enters a high-birefringence polarization maintaining optical fiber (103) to be measured through the optical fiber polarizer (102), the signal output end of the high-birefringence polarization maintaining optical fiber (103) to be measured is connected with an analyzer (104), the high-birefringence polarization maintaining optical fiber (103) to be measured and the analyzer (104) jointly form a Mach-Zehnder interferometer, the signal output end of the Mach-Zehnder interferometer is provided with an electro-optic modulator (105), an optical carrier microwave signal on the electro-optic modulator (105) is incident on a high-speed photoelectric detector (107) after passing through a dispersion optical fiber (106), the high-speed photoelectric detector (107) converts the optical signal into a microwave signal and amplifies the microwave signal through a low-noise amplifier (108), the output end of the low-noise amplifier (108) is, the microwave power divider (109) injects a part of microwave signals into the electro-optical modulator (105), and simultaneously inputs the other part of microwave signals into the frequency spectrograph (201), and the tail end of the frequency spectrograph (201) is connected with the computer (202);
an electro-optical modulator (105), a dispersion optical fiber (106), a high-speed photoelectric detector (107), a low-noise amplifier (108) and a microwave power divider (109) form a photoelectric oscillator, and the input end of a loop of the photoelectric oscillator is connected with the output end of the Mach-Zehnder interferometer;
the measurement principle of the device for measuring the beat length of the polarization maintaining optical fiber is as follows: the optical path difference of two paths of light propagating in the high-birefringence polarization-maintaining fiber (103) to be tested is different through the mode birefringence of the high-birefringence polarization-maintaining fiber (103) to be tested, the central frequency of a microwave signal output by the photoelectric oscillator is related to the optical path difference, the beat length of the high-birefringence polarization-maintaining fiber (103) to be tested can be obtained according to the central frequency of the microwave signal, and the beat length of a wide-spectrum light source is L after passing through the beat lengthpAfter the high birefringence polarization maintaining fiber (103) to be tested, selecting the high birefringence polarization maintaining fiber (103) to be tested with a proper length to enable two paths of light transmitted on two polarization local oscillation axes of the high birefringence polarization maintaining fiber (103) to be tested to meet interference conditions at the tail end of the high birefringence polarization maintaining fiber (103) to be tested to interfere, and then outputting interference fringes can be expressed as follows in a frequency domain:
wherein A is the visibility of the output interference fringe of the interferometer, and Delta omega is the frequency interval of the output interference fringe when the optical path difference of different interferometers exists,
for phase drift of interferometers, ω0For the center circle frequency of the laser, Δ ω can be expressed as:
Δω＝2πcLp/λ0l (2)
where c is the speed of light, λ0For the central wavelength of the wide-spectrum light source (101), and l is the length of the high-birefringence polarization-maintaining fiber (103) to be measured, the free spectral range of the interferometer can be expressed as follows:
the output light of the interference is wavelength dependent, and its electric field can be characterized as:
E(t)＝∫E(ω)ejωtdω (4)
the optical power spectral density of the broad spectrum light source (101) can be expressed as:
T(ω)＝|E(ω)|2 (5)
after the interference fringes output by the interferometer pass through the electro-optical modulator (105), each frequency component E (omega) of the optical spectrum is modulated, and a microwave signal with the frequency xi is generated by the photoelectric oscillator loop, and the optical field output by the electro-optical modulator (105) can be represented as:
E(ω)＝ejωt(1+ejξt+e-jξt) (6)
a dispersive optical fiber (106) is used in an optoelectronic oscillator as a delay line whose electric field transfer function can be expressed as:
H(ω)＝|H(ω)|e-jφ(ω) (7)
φ (ω) is the phase introduced by the delay of the dispersive fiber (106), which can be expressed as:
in the formula, τ (ω)0) Is composed ofHeart frequency of omega0Group delay of time, beta is the dispersion of the dispersive fiber (106) in ps2The/km, β can be expressed as:
wherein D (ps/km/nm) is the dispersion coefficient of the dispersive optical fiber (106), λ0Is the wavelength of a wide-spectrum light source (101),
the optoelectronic oscillator response function is obtained according to equation (5) -9 as:
wherein
It can be seen that the center frequency of the microwave signal output by the optoelectronic oscillator can be expressed as:
from this, the beat length of the high birefringence polarization maintaining fiber (103) to be measured is:
from the above equation, the beat length of the high birefringence polarization maintaining fiber (103) to be measured can be obtained from the center frequency of the microwave signal output from the optoelectronic oscillator, the center wavelength of the wide spectrum light source (101), the dispersion coefficient and length of the dispersion fiber (106), and the length of the high birefringence polarization maintaining fiber (103) to be measured.
2. The device for measuring the beat length of the polarization maintaining optical fiber according to claim 1, wherein the high birefringence polarization maintaining optical fiber (103) to be measured is connected with the optical fiber polarizer (102) by welding, and the welding angle is 45 degrees.
3. The apparatus for measuring beat length of polarization maintaining fiber according to claim 1, wherein the wide spectrum light source (101) is a Gaussian or rectangular light source.
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| JPS58223032A (en) * | 1982-06-22 | 1983-12-24 | Agency Of Ind Science & Technol | Method for measuring beat length of constant polarization fiber |
| JPS60147627A (en) * | 1984-01-13 | 1985-08-03 | Nippon Telegr & Teleph Corp <Ntt> | Method and device for measuring characteristics of polarization maintaining optical fiber |
| CN100476387C (en) * | 2006-02-21 | 2009-04-08 | 北京航空航天大学 | System for detecting polarization maintaining optical fiber beat length |
| CN101592551B (en) * | 2009-06-05 | 2011-01-12 | 北京航空航天大学 | Sagnac interferometer-based method and Sagnac interferometer-based device for testing beat length of polarization maintaining optical fiber |
| CN102914423B (en) * | 2012-11-01 | 2015-06-03 | 电子科技大学 | Measuring method for sag frequency of dispersion optical fiber |
| CN103090813B (en) * | 2013-01-15 | 2016-04-06 | 电子科技大学 | A kind of high resolving power sensor-based system based on OFDR systematic survey beat length of polarization maintaining optical fiber and strain |
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| CN105675258B (en) * | 2016-01-04 | 2018-01-09 | 安徽大学 | High birefringence optical fiber beat length measuring method and measuring device based on interference order |
| CN106546411B (en) * | 2016-10-19 | 2018-09-28 | 北京航空航天大学 | Polarization maintaining optical fibre Verdet constant measuring apparatus and method based on Mach-Zehnder and Michelson interferometers |
| CN106643522A (en) * | 2016-12-28 | 2017-05-10 | 西南交通大学 | Optical-fiber low-coherence interference displacement demodulation device and method based on photoelectric oscillator |
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