CN110346304A - A kind of optical fiber polarisation spectrum analysis system based on timeslot multiplex - Google Patents
A kind of optical fiber polarisation spectrum analysis system based on timeslot multiplex Download PDFInfo
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- CN110346304A CN110346304A CN201910561005.4A CN201910561005A CN110346304A CN 110346304 A CN110346304 A CN 110346304A CN 201910561005 A CN201910561005 A CN 201910561005A CN 110346304 A CN110346304 A CN 110346304A
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 98
- 238000010183 spectrum analysis Methods 0.000 title claims abstract description 12
- 230000010287 polarization Effects 0.000 claims abstract description 78
- 230000003287 optical effect Effects 0.000 claims abstract description 61
- 238000006243 chemical reaction Methods 0.000 claims abstract description 13
- 230000003595 spectral effect Effects 0.000 claims abstract description 9
- 238000012546 transfer Methods 0.000 claims abstract description 4
- 239000002184 metal Substances 0.000 claims description 9
- 229910052751 metal Inorganic materials 0.000 claims description 9
- 238000007747 plating Methods 0.000 claims description 4
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 3
- 239000010931 gold Substances 0.000 claims description 3
- 229910052737 gold Inorganic materials 0.000 claims description 3
- 230000011514 reflex Effects 0.000 claims description 2
- 238000004458 analytical method Methods 0.000 abstract description 7
- 230000005540 biological transmission Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 238000000926 separation method Methods 0.000 description 5
- 238000001514 detection method Methods 0.000 description 4
- 239000000835 fiber Substances 0.000 description 4
- 238000003384 imaging method Methods 0.000 description 3
- 230000005855 radiation Effects 0.000 description 3
- 239000006185 dispersion Substances 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 235000013305 food Nutrition 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
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- 238000004611 spectroscopical analysis Methods 0.000 description 2
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/28—Investigating the spectrum
- G01J3/447—Polarisation spectrometry
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/21—Polarisation-affecting properties
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
Abstract
The optical fiber polarisation spectrum analysis system based on timeslot multiplex that the invention discloses a kind of, including incoming optical fiber, polarised light spectrophotometric unit, polarization optical receiver lens group, polarization photo detecting unit, time delay optical fiber and polarization optical conversion element；Incoming optical fiber one end is used to input pulse optical signal, and the other end is connect with polarised light spectrophotometric unit；Polarised light spectrophotometric unit is inclined optical fiber grating, and the pulsed optical signals of input are divided into P-polarized light and S polarized light；Time delay optical fiber is for generating delay and by P-polarized light input polarization optical conversion element；P-polarized light is converted to the second S polarized light, reverse transfer to polarised light spectrophotometric unit, the metallic reflection plated by polarised light spectrophotometric unit lower end to polarization optical receiver lens group and polarization photo detecting unit by polarization optical conversion element.Structure of the invention is more simple and compact, high stability, suitable for inclement condition, complicated field and industrial environment, can carry out real-time, quick, high-precision analysis to spectral information.
Description
Technical field
The invention belongs to light polarization analysis technical fields, more particularly, to a kind of optical fiber polarisation based on timeslot multiplex
Spectroscopic analysis system.
Background technique
Currently, the paces of the industrialization of the country and modernization are constantly accelerated, China, which further develops, will more put forth effort to solve
The problems such as environmental pollution, food safety and drug safety, how to carry out in real time, fast and accurately detection have become it is current
One of research hotspot.In numerous analysis methods, polarization spectrum analysis have it is easy to detect flexibly, analysis speed is fast, detection
Precision is high, testing cost is low, the advantages that sample nondestructive detection may be implemented, to the real-time online mistake realized in food and medicine production
Journey is analyzed and the application such as is used for quickly detecting and monitor to environmental pollutants with very big facilitation and important meaning,
It is the important component for realizing modernization operation and control.Compared to now widely used chemical analysis method, improving
Significant achievement is achieved in terms of production efficiency and quality.
Polarization is one of key property of light, and it comprises many important information.Currently, the polarization characteristic of light is in many
Field has all obtained important application, such as the limitation of traditional multiplexing mechanism is breached using the optical communication system of palarization multiplexing,
The transmission rate and transmission capacity of system are doubled up；Introduce polarization information in imaging systems, can obtain have compared with
The image of high resolution, while some information that traditional intensity imaging system can not capture can be obtained, enhancing imaging
Effect.By demodulating to object reflected light polarization information, some unique characteristics of object can be obtained, in material composition
It plays an important role in analysis.By analyzing polarization state, have to the information quickly and accurately analyzed in input light important
Meaning.
Current existing spectral analysis technique mainly passes through spectrometer and is analyzed, by rotating light splitting part therein
It realizes the spectrum analysis to signal light, in spectroscopic analysis system includes movable component, therefore anti-seismic performance is poor, is not suitable for
Complicated, the severe field Real-time measuring and analyzing on the spot in environment, optical element is more in simultaneity factor, and optical path is complicated, price
Costly, maintenance cost is higher, is unfavorable for the extensive use of spectrum analysis.
Summary of the invention
In view of the drawbacks of the prior art, the purpose of the present invention is to provide a kind of optical fiber polarisation spectrum based on timeslot multiplex
Analysis system, it is intended to solve existing polarization spectrum analysis system due to inside have movable part and optical element it is more caused by
Stability is poor, system structure complexity problem.
To achieve the above object, the optical fiber polarisation spectrum analysis system based on timeslot multiplex that the present invention provides a kind of, packet
Incoming optical fiber, polarised light spectrophotometric unit, polarization optical receiver lens group, polarization photo detecting unit, time delay optical fiber and polarised light is included to turn
Change unit；
Incoming optical fiber one end is used to input pulse optical signal, and the other end is connect with polarised light spectrophotometric unit；Polarised light light splitting
Unit is inclined optical fiber grating, and lower end is coated with metal, and the pulsed optical signals of input are divided into the P-polarized light for being parallel to optical fiber axial direction
With the S polarized light perpendicular to optical fiber axial direction；Polarised light reflecting unit edge is placed on perpendicular to optical fiber axial direction is disposed with polarised light
Receiving lens group and polarization photo detecting unit；Time delay optical fiber is for generating delay and by P-polarized light input polarization optical conversion element；
It polarizes optical conversion element and the P-polarized light of input is converted into the second S polarized light, the second S polarized light reflected is through time delay optical fiber
To polarised light spectrophotometric unit, the metal plated by polarised light spectrophotometric unit lower end reflects reverse transfer along perpendicular to optical fiber axial direction direction
To polarization optical receiver lens group.
Preferably, the metal of the lower end plating of inclined optical fiber grating is gold, by light transmission and reflection to polarization optical receiver lens group.
Preferably, inclined optical fiber grating is located in incoming optical fiber fast axle, is divided when there is pulsed optical signals to be transmitted to polarised light
When unit, the S-polarization component in pulsed optical signals can occur diffraction and be transmitted to polarization optical receiver lens group, in pulsed optical signals
P-polarization component continues onwards transmission to time delay optical fiber.
Preferably, the tilt angle of inclined optical fiber grating is 23.1 °~66.9 °, i.e., all inclinations angle that can generate radiation
Degree can be realized, be optimal polarization separation when wherein tilt angle is 45 °.
Preferably, being passed to optical fiber is polarization maintaining optical fibre, guarantees that pulsed optical signals linear polarization is constant.
Preferably, polarization conversion unit is faraday's rotating mirror, for the polarization direction of the light of input to be become perpendicular quadrature
Direction, i.e., the P-polarized light of input is converted into the second S polarized light, spread out when being transmitted at inclined optical fiber grating to lower end
It penetrates.
Preferably, polarization optical receiver lens group includes cylindrical lens and plano-convex lens, for carrying out the polarised light received
Collimation focusing, the plano-convex lens are located at the cylindrical lens rear, and the plano-convex lens plane is close to the cylindrical lens, convex surface position
In the other side.
Preferably, polarization photo detecting unit is a line array CCD, is analyzed and processed acquisition different polarization states using FPGA
Spectral information.
Preferably, the spectral information of different polarization states includes the superposition of S polarized light, the second S polarized light and the two.If S
The expression formula of polarised light is PS=AE1, the expression formula of the second S polarized light is PP=BE2, then the light intensity of the S polarized light received is
A2, the light intensity of the second S polarized light is B2, the superimposed light intensity of the two is A2+B2。
Preferably, pulsed optical signals are generated delay by time delay optical fiber, and delay can make by inclined optical fiber grating diffraction again
The second S-polarization light component out is in two adjacent pulse spacings, to realize timeslot multiplex.Pulse spacing long enough, energy
Again pass by the light being reflected back by faraday's rotating mirror when oblique raster diffraction is gone out in the pulse spacing, so that light be avoided to believe
Number aliasing.The relationship of the length L and light pulsing intervals Δ t of time delay optical fiber meet:
Wherein C is the spread speed of light in vacuum, C=3 × 108M/s, n are the refractive index of time delay optical fiber.
Contemplated above technical scheme through the invention, compared with prior art, can obtain it is following the utility model has the advantages that
1, the optical fiber polarisation spectrum analysis system provided by the invention inclined optical fiber grating gold-plated using lower end, passes through farad
P-polarized light is converted to S polarized light by rotating mirror, therefore only needs set of system for the detection of two beam S polarized lights, thus
Keep the structure of this system more simple and compact, high stability, suitable for inclement condition, complicated field and industrial environment；
2, the inclined optical fiber grating that can be changed present invention employs tilt angle is spectrophotometric unit, by adjusting the inclination of grating
Angle can get different application wave-length coverages, avoids and needs to rotate dispersion element acquisition length scanning in conventional spectrometers
Defect can carry out real-time, quick, high-precision analysis to spectral information；
3, present invention employs time delay optical fibers, pulsed optical signals are produced delay, the delay of generation can make by inclination
Fiber grating the second S-polarization light component that diffraction goes out again is in two adjacent pulse spacings, thus realize timeslot multiplex, with
Avoid aliasing.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of optical fiber polarisation spectroscopic system provided by the invention；
Fig. 2 is the structural schematic diagram of the inclined optical fiber grating of optical fiber polarisation spectroscopic system provided by the invention；
Fig. 3 is Signal Degree of Polarization schematic diagram of the inclined optical fiber grating provided by the invention under differing tilt angles.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.As long as in addition, technical characteristic involved in the various embodiments of the present invention described below
Not constituting conflict each other can be combined with each other.
The optical fiber polarisation spectrum analysis system based on timeslot multiplex that the present invention provides a kind of, including incoming optical fiber, polarization
Light spectrophotometric unit, polarization optical receiver lens group, polarization photo detecting unit, time delay optical fiber and polarization optical conversion element；
Incoming optical fiber one end is used to input pulse optical signal, and the other end is connect with polarised light spectrophotometric unit；Polarised light light splitting
Unit is inclined optical fiber grating, and lower end is coated with high-reflectivity metal, and the pulsed optical signals of input are divided into and are parallel to optical fiber axial direction
P-polarized light and S polarized light perpendicular to optical fiber axial direction；Polarised light reflecting unit edge is placed on perpendicular to optical fiber axial direction to be set gradually
There are polarization optical receiver lens group and polarization photo detecting unit；Time delay optical fiber is for generating delay and by P-polarized light input polarization light
Converting unit；It polarizes optical conversion element and the P-polarized light of input is converted into the second S polarized light, the second S polarized light warp reflected
Time delay optical fiber reverse transfer is to polarised light spectrophotometric unit, and the metal plated by polarised light spectrophotometric unit lower end is along perpendicular to optical fiber axial direction
Direction reflexes to polarization optical receiver lens group.
Specifically, the metal of the lower end plating of inclined optical fiber grating is gold, by light transmission and reflection to polarization optical receiver lens group.
Specifically, inclined optical fiber grating is located in incoming optical fiber fast axle, is divided when there is pulsed optical signals to be transmitted to polarised light
When unit, the S-polarization component in pulsed optical signals can occur diffraction and be transmitted to polarization optical receiver lens group, in pulsed optical signals
P-polarization component continues onwards transmission to time delay optical fiber.
Specifically, the tilt angle of inclined optical fiber grating is 23.1 °~66.9 °, i.e., all inclinations angle that can generate radiation
Degree can be realized, be optimal polarization separation when wherein tilt angle is 45 °.
Specifically, being passed to optical fiber is polarization maintaining optical fibre, guarantees that pulsed optical signals linear polarization is constant.
Specifically, polarization conversion unit is faraday's rotating mirror, for the polarization direction of the light of input to be become perpendicular quadrature
Direction, i.e., the P-polarized light of input is converted into the second S polarized light, spread out when being transmitted at inclined optical fiber grating to lower end
It penetrates.
Specifically, polarization optical receiver lens group includes cylindrical lens and plano-convex lens, for carrying out the polarised light received
Collimation focusing, the plano-convex lens are located at the cylindrical lens rear, and the plano-convex lens plane is close to the cylindrical lens, convex surface position
In the other side.
Specifically, polarization photo detecting unit is a line array CCD, is analyzed and processed acquisition different polarization states using FPGA
Spectral information.
Specifically, the spectral information of different polarization states includes the superposition of S polarized light, the second S polarized light and the two.If S
The expression formula of polarised light is PS=AE1, the expression formula of the second S polarized light is PP=BE2, then the light intensity of the S polarized light received is
A2, the light intensity of the second S polarized light is B2, the superimposed light intensity of the two is A2+B2。
Specifically, pulsed optical signals are generated delay by time delay optical fiber, and delay can make by inclined optical fiber grating diffraction again
The second S-polarization light component out is in two adjacent pulse spacings, to realize timeslot multiplex.Pulse spacing long enough, energy
Again pass by the light being reflected back by faraday's rotating mirror when oblique raster diffraction is gone out in the pulse spacing, so that light be avoided to believe
Number aliasing.The relationship of the length L and light pulsing intervals Δ t of time delay optical fiber meet:
Wherein C is the spread speed of light in vacuum, C=3 × 108M/s, n are the refractive index of time delay optical fiber.
Technical solution of the present invention is described in further detail with reference to the accompanying drawing, as shown in Figure 1, including a biography
Enter optical fiber, a polarised light spectrophotometric unit, a polarization optical receiver lens group, a polarization photo detecting unit, a delay light
Fine and faraday's rotating mirror, being passed to optical fiber is one section of panda type polarization-preserving fiber, and one end is used to input pulse optical signal, in addition one
End connects with polarised light spectrophotometric unit, and polarised light spectrophotometric unit is the inclined optical fiber grating in incoming optical fiber fast axle, and lower end has
Gold-plated, when there is pulsed optical signals to be transmitted to polarised light spectrophotometric unit, diffraction biography can occur for the S-polarization component in pulsed optical signals
Polarization optical receiver lens group is transported to, the P-polarization component in optical signal continues onwards transmission to time delay optical fiber, and time delay optical fiber believes light
Number generate postpone and P-polarization component is continued to be transmitted to faraday's rotating mirror, faraday's rotating mirror becomes the polarization direction of input light
Incoming P-polarization component can be become S-polarization component, namely be S-polarization when reflecting by perpendicular quadrature direction
To lower end diffraction occurs for light when being transmitted at inclined optical fiber grating.At this time since optical fiber lower end has gold-plated, light is reflected upwards again
It is transmitted to polarization optical receiver lens group.Polarization optical receiver lens group is made of a cylindrical lens and a plano-convex lens, can be incited somebody to action
The optical signal received is focused, and is then projected to polarization photo detecting unit, i.e. a line array CCD, the location of pixels on CCD with
The position of the hot spot of different wave length has one-to-one relationship, can obtain not after being handled using FPGA output signal
It is folded including S polarized light after the reflection of faraday's rotating mirror of S polarized light, P-polarized light and the two with the spectral information of polarization state
Add.
Fig. 2 is the structure and dispersion characteristics schematic diagram of inclined optical fiber grating, can be used to explain inclined optical fiber grating
Dichroism.Optical grating construction inside inclined optical fiber grating works as optical signal transmission there is the interface that a refractive index is mutated
When the interface being mutated to refractive index, polarization separation may be implemented, radiation inclined optical fiber grating has S-polarization in incident light point
The ability for the output fiber that spreads out is measured, P-polarization component continues to transmit along optical fiber.When the tilt angle difference of inclined optical fiber grating, S-polarization
The angle of component diffraction is different.
Fig. 3 is Signal Degree of Polarization schematic diagram of the inclination angle fiber grating under differing tilt angles, it can be seen that inclination angle
Degree can realize polarization separation at 23.1 °~66.9 °, and according to Brewster's law, Brewster's angle is θ=arctan
[(n+ Δ n)/n], negligible relative to n, Δ n, inclination angle theta is about 45 ° at this time, therefore 45 ° of inclined optical fiber gratings are optimal inclined
Vibration separation.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should all include
Within protection scope of the present invention.
Claims (10)
1. a kind of optical fiber polarisation spectrum analysis system based on timeslot multiplex, which is characterized in that including incoming optical fiber, polarised light point
Light unit, polarization optical receiver lens group, polarization photo detecting unit, time delay optical fiber and polarization optical conversion element；
Described incoming optical fiber one end is used to input pulse optical signal, and the other end is connect with the polarised light spectrophotometric unit；It is described inclined
Vibration light spectrophotometric unit is inclined optical fiber grating, and lower end is coated with metal, the pulsed optical signals of input are divided into and are parallel to optical fiber axial direction
P-polarized light and S polarized light perpendicular to optical fiber axial direction；The polarised light reflecting unit edge is placed on successively perpendicular to optical fiber axial direction
It is provided with the polarization optical receiver lens group and the polarization photo detecting unit；The time delay optical fiber is for generating delay and by P
Polarised light inputs the polarization optical conversion element；The P-polarized light of input is converted to the second S-polarization by the polarization optical conversion element
Light, the second S polarized light reflected is through time delay optical fiber reverse transfer to polarised light spectrophotometric unit, by polarised light spectrophotometric unit lower end
The metal of plating reflexes to polarization optical receiver lens group along perpendicular to optical fiber axial direction direction.
2. system according to claim 1, which is characterized in that the metal of the lower end plating of the inclined optical fiber grating is gold.
3. system according to claim 2, which is characterized in that the inclined optical fiber grating is located in incoming optical fiber fast axle.
4. system according to claim 3, which is characterized in that the tilt angle of the inclined optical fiber grating be 23.1 °~
66.9°。
5. system according to claim 1, which is characterized in that the incoming optical fiber is polarization maintaining optical fibre, guarantees pulsed light letter
Number linear polarization is constant.
6. system according to claim 1, which is characterized in that the polarization conversion unit is faraday's rotating mirror, and being used for will
The polarization direction of the light of input becomes perpendicular direction, i.e., the P-polarized light of input being converted to the second S polarized light.
7. system according to claim 1, which is characterized in that the polarization optical receiver lens group includes cylindrical lens and plano-convex
Lens, for the polarised light received to be carried out collimation focusing, the plano-convex lens are located at the cylindrical lens rear, the plano-convex
Lens plane is located at the other side close to the cylindrical lens, convex surface.
8. system according to claim 1, which is characterized in that the polarization photo detecting unit is a line array CCD, is used
FPGA is analyzed and processed the spectral information for obtaining different polarization states.
9. system according to claim 8, which is characterized in that the spectral information of the different polarization states include S polarized light,
The superposition of second S polarized light and the two.
10. system according to claim 1, which is characterized in that the length L and light pulsing intervals Δ t of the time delay optical fiber
Relationship meet:
Wherein C is the spread speed of light in vacuum, C=3 × 108M/s, n are the refractive index of time delay optical fiber.
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Cited By (2)
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| CN110987367A (en) * | 2019-11-29 | 2020-04-10 | 山西大学 | Device and method for measuring and controlling polarization mode of nano optical fiber |
| CN114690311A (en) * | 2022-03-02 | 2022-07-01 | 华中科技大学 | Integrated polarization-wavelength division demultiplexer and preparation method thereof |
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