CN107656336B - It is a kind of that resolving device is polarized in line vector based on tunnelling ray waveguide - Google Patents
It is a kind of that resolving device is polarized in line vector based on tunnelling ray waveguide Download PDFInfo
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- CN107656336B CN107656336B CN201710917252.4A CN201710917252A CN107656336B CN 107656336 B CN107656336 B CN 107656336B CN 201710917252 A CN201710917252 A CN 201710917252A CN 107656336 B CN107656336 B CN 107656336B
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- G—PHYSICS
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- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
- G02B6/12—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind
- G02B6/122—Basic optical elements, e.g. light-guiding paths
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Abstract
The invention discloses a kind of to polarize resolving device in line vector based on tunnelling ray waveguide, comprising: two bound mode waveguides, a tunnelling ray waveguide and detector array；Bound mode waveguide is the waveguide to match with optical path waveguiding structure to be differentiated, for importing and exporting the optical signal of optical path waveguide transmission to be differentiated；Tunnelling ray waveguide is the waveguide to match with bound mode waveguiding structure, for leaking the part optical signals of its sandwich layer；Detector array is classified as a series of photodetectors, for detecting the optical signal leaked from tunnelling ray waveguide core layer.The present invention has the function of compact shape and perfect, and makes simple, easy to use.Optical signal may be implemented in transmission process in it, low damage and continuously detection vector polarization, to extract the information for being hidden in waveguide core layer.Meanwhile relevant apparatus will not be interrupted in the process of work, the online resolution of vector polarization may be implemented, and resolution is preferable, accuracy is higher.
Description
Technical field
The invention belongs to optical communication field, optical device field and waveguide device and integrated device field, more specifically
Ground, be related to it is a kind of based on tunnelling ray waveguide line vector polarize resolving device
Background technique
With the rapid development of optical communication, the characteristics of tunnelling ray waveguide is due to its own energy leakage, in sensing and coupling
The fields such as conjunction have critically important status.Early in the second half in 20th century, tunnelling ray waveguide has been just that microwave waveguide research is most living
One of field of jump.1956, a series of reports of the Brooklyn Institute of Technology were put forward for the first time the concept of leakage mode.Together
Year, article " the On field representations in terms of leaky modes or of Marcuvitz
Eigenmodes " for the first time by the potential well analogy in leakage mode and quantum mechanics, and points out that existing wave equation is only capable of retouching
The field of central area of the leakage mode with complex propagation constant is stated, and this at unlimited horizontal space is increased with exponential form
It is long.Then, more and more researchers begin one's study tunnelling ray waveguide, and the characteristics such as its dispersion and loss are applied to optics
Communication.
Mode differentiates the important way that optical information is extracted as analysis, is widely used in laser, sensing, coupling and light
The various fields such as fiber communication, and polarizing resolution is finer a kind of analysis mode during mode is differentiated, it, which can be distinguished, has not
With the mode of polarization.2003, one kind was described in Chinese invention patent CN1441271A " Waveguide type polarization mode separator "
The waveguide devices of polarization mode separation, the devices use optical beam-splitter obtain the identical optical signal of two-way, recycle top layer
The waveguiding structure for being covered with metal makes the Different Effects of transverse electric field (TE) mode and transverse magnetic (TM) mode effective refractive index
The different polarization mode acquisition out of phase of two ways of optical signals is poor, and two ways of optical signals is finally input to three-dB coupler, different phases
Position signal will be exported from different ports, to realize the separation of different polarization mode.As can be seen that foregoing invention is one
Independent optical signal polarization mode separating extraction device, it cannot differentiate mode in real time, and isolated polarization mode is limited, also
The integrality of initial signal is destroyed to a certain extent.
Summary of the invention
Aiming at the above defects or improvement requirements of the prior art, the present invention provides a kind of based on the online of tunnelling ray waveguide
Vector polarizes resolving device, and its object is to distinguish the mode with different vectors polarization in real time, it is intended to solve existing polarization point
Distinguish non-technical problem online, resolving device preparation is complicated.
To achieve the above object, the present invention provides a kind of polarizes resolving device, packet in line vector based on tunnelling ray waveguide
It includes: two bound mode waveguides, a tunnelling ray waveguide and detector array；
The tunnelling ray waveguide is mold leakage type waveguide, for leaking the part optical signals of its sandwich layer；The tunnelling ray
Waveguide both ends are respectively provided with the bound mode waveguide, are arranged with tunnelling ray Waveguide coaxial gapless, collectively form a light
Channel；
The bound mode waveguide, tunnelling ray waveguide and optical path waveguiding structure to be differentiated match, and the bound mode waveguide is used
In importing and export the optical signal in optical path waveguide to be differentiated；
The detector array is arranged in tunnelling ray waveguide surface, is let out by the identical photodetector of multiple performances around described
Stripping pattern waveguide arranged radially composition, each detector is concordant in axial position, and the plane constituted is vertical with waveguide axis；For examining
Survey the optical signal leaked from tunnelling ray waveguide core layer.
Further, the detector array row detector number is N, and wherein M detector constitutes a detector group, M
For the integer more than or equal to 2, equal to the number of peak value in corresponding vector polarization mode formula far-field radiation pattern；In same group detector,
Each detector placement is determined according to the far-field radiation pattern of respective vectors polarization mode.For a vector polarization mode
Formula, there are M beam light leakage, the angle between each leakage light beam and waveguide core axis is the same, but position is different, is similar to circle
Cone.
Further, the detector array shows Q detector group, and Q value is equal to the number of vector polarization mode formula to be differentiated；
Q value is 2 for only differentiating the vector polarization in a kind of order mode, Q value when differentiating the vector polarization of a variety of order modes
Equal to twice of order number of modes to be differentiated.
Wherein, in each detector group, the distribution of detector is different, including arrangement mode is different or detector
Quantity is different, this is that the feature of mode itself determines that we obtain this feature by observation far-field radiation pattern；Every group of spy
Surveying device distribution has corresponding vector polarization mode formula, and the corresponding relationship of the two is determined by calculation, sets correspond in advance
The required multiple groups detector for differentiating vector polarization mode formula.
Further, a kind of basic mode resolving device based on vector polarization resolving device, which is characterized in that the detector
There are two detector group, every group of two detectors to be symmetricly set on horizontal or vertical direction about waveguide axis for array.
Further, a kind of second order mode resolving device based on vector polarization resolving device, which is characterized in that the detection
There are two detector group, any detector groups to be made of four detectors for device array, and four detectors are in 90 about waveguide axis
Angle is spent to be symmetrical arranged.
Further, the vector of the specific order mode polarizes resolving device, which is characterized in that two groups of detector arrays
Each comfortable axial concordant but concordant position of detector in column has differences.
Further, the vector of the specific order mode polarizes resolving device detector array, which is characterized in that the axis
It is determined, can be determined by calculation by associative mode order to flush position.
Further, the axial position of the detector array can translate left and right in the axial direction, to adapt to difference
The resolution of vector polarization mode in order mode.
In use, the bound mode waveguide at resolving device both ends is docked with optical path waveguide to be differentiated, because of the knot of each waveguide
Structure matches, so most of couples optical energy in optical path waveguide to be differentiated is into tunnelling ray waveguide, small part optical signal is from letting out
Stripping pattern waveguide core layer is leaked to be detected by photodetector.Optical path wave to be differentiated wherein has been contained in small part optical signal
The vector polarization mode formula for leading sandwich layer whole, since the far-field radiation pattern of different vector polarization mode formulas is different, detector can be rung
The position answered is not also identical, therefore the distribution and multiple spies of a kind of far-field radiation pattern peak value can be corresponded to according to a detector group
One criterion need to be only set when detector position repeats in survey device group, to have calibrated each detector group in advance.Pass through sight again
The distribution for detecting the detector of signal is examined, according to the standard corresponding relationship predefined, to show that respective vectors polarize
The type of mode.
The present invention has the function of compact shape and perfect, and makes simple, easy to use.It may be implemented light and exists
During transmission, low damage and continuously detection vector polarization, to extract the information for being hidden in waveguide core layer.Simultaneously as should
Resolving device can access transmission optical path in advance, so relevant apparatus will not interrupt during the work time, initial optical signal will not
It is destroyed, can be differentiated in real time.In addition to this, the vector polarization resolution of the present invention during the work time is relatively preferable,
Difference is obvious between different vector polarization mode formulas, therefore accuracy is high.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of vector polarization resolving device of the present invention；
Fig. 2 is the sectional view of bound mode waveguide and tunnelling ray waveguide of the present invention；
Fig. 3 is the energy profile and far-field radiation pattern of each leakage mode；
Fig. 4 is the sandwich layer energy profile and corresponding far field of two second order polarization modes respectively even illumination and odd mode
Distribution map.
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.
Fig. 1 is the structural schematic diagram of vector polarization resolving device of the present invention, and wherein bound mode waveguide has selected general step wave
It leads, tunnelling ray waveguide has selected W type to leak waveguide, and Fig. 2 is the sectional view of bound mode waveguide and tunnelling ray waveguide.Step waveguide core
Layer refractive index is n1, cladding refractive index n0；W type, which leaks waveguide, has two coverings, and the refractive index of sandwich layer and surrounding layer is
N1, the refractive index of inner cladding are n0；Wherein n1 > n0.The thickness of two kinds of waveguide core layers is identical, is set as a；The inner cladding of W-type guide
Thickness is set as d；Wavelength is λ.Since bound mode waveguide and tunnelling ray waveguide match, so most of couples optical energy is into tunnelling ray
Waveguide.Then change the slip of leakage mode by changing the size of d, so that most of light still remains in sandwich layer, finally
It is coupled into next bound mode waveguide.The light that small part leaks is detected by the detector.
According to existing theory, core radius is a, inner cladding diameter is b W type that we have further obtained leaks waveguide
The longitudinal component expression formula of leakage mode electric and magnetic fields:
Wherein JmIt is Bessel function of the first kind, ImIt is first kind modified Bessel function, KmIt is the second class amendment Bezier
Function, Hm (2)It is Hankel function of the second kind；M indicates the order of each function.AndI takes 1,2,3；I indicates the of tunnelling ray waveguide
I layers, niIt is i-th layer of refractive index, kiIt is i-th layer of wave vector, ki⊥Indicate its vertically component with waveguide axis, k0It indicates freely
Space wave number, β are the complex propagation constants of mode；φ is the angle for leaking light beam and waveguide core axis, and ε is dielectric constant；Z0It is
Vacuum impedance；R represents mould field to the distance of waveguide core axis.Using the continuity on boundary, the feature side of MX=0 form is obtained
Journey, X=[A, B, C, D, a, b, c, d]T, M be according to above-mentioned piecewise function at the node matrix derived from continuous institute, with variable β,
M, L is related, and L is the l-th root of this feature equation.As can be seen that mono- timing of order m, the longitudinal direction of leakage mode electric and magnetic fields
Component has even number and odd number solution.In order to further discriminate between even number and odd mode, we are to the far-field radiation pattern for leaking waveguide
It is studied, and identifies that both of which (can be with known function come mould by formula using the information being hidden in radiation diagram
0 mode distributions of W type leakage mould waveguide are drawn up, β or mono- timing of m is also obtained by calculation, and there are two different solutions).
Take n1=3.16, n0=1, λ=1um, a=0.7um, d=0.05um.We analyze the difference in tunnelling ray waveguide
Far-field radiation pattern on type leakage mode cross section.Work as m=1, when L=1 or 2, corresponding to the basic mode of two cross-polarization, leads to
It crosses simulation calculation and obtains the sandwich layer energy profile and corresponding far-field distribution figure of two basic modes respectively even illumination and odd mode
As shown in Figure 3.Find out from the figure, even illumination or odd mode have essentially identical far-field radiation pattern, and two orthogonal inclined
The basic mode that shakes has large energy on the horizontal or vertical direction of the intersection in tunnelling ray waveguide surface and face perpendicular to the axis.Cause
This, we dispose four photodetectors to visit light intensity on the intersection in tunnelling ray waveguide surface and face perpendicular to the axis
It surveys, so that it may the standard corresponding relationship of the detector of signal being distributed to contrast it with cross-polarization basic mode is detected by observing
Obtain the type of respective vectors polarization mode.
Work as m=2, when L=1 or 2, corresponds to two second order polarization modes, two second orders polarizations are obtained by simulation calculation
The sandwich layer energy profile and corresponding far-field distribution figure of mode respectively even illumination and odd mode are as shown in Figure 4.From the figure
Find out, even illumination or odd mode have essentially identical far-field radiation pattern, and two second order polarization modes are in tunnelling ray waveguide
The specific position of the intersection on surface and face perpendicular to the axis has large energy.Therefore, we tunnelling ray waveguide surface and with
Two groups of photodetectors are disposed to detect light intensity on the intersection of axis vertical plane, every group of four photodetectors are about wave
Guide shaft line is symmetrical arranged in 90 degree of angles, so that it may detect the distribution of the detector of signal by observation to contrast itself and second order
The standard corresponding relationship of polarization mode obtains the type of respective vectors polarization mode.
The case where for m > 2, is similar to the above, the vector polarization resolving device of different rank mode, in detector array
Detector is each comfortable axial concordant, but axial concordant position is determined by associative mode order, can be determined by calculation.And
The axial position can translate left and right in the axial direction, to adapt to the resolution of the vector polarization mode in different rank mode.We
Designed vector polarization resolving device can only differentiate a kind of vector polarization of order mode, can also differentiate a variety of order modes
Vector polarization.
Low damage and continuously detection vector polarization may be implemented in the vector polarization resolving device obtained in the above manner, can be very
The complexity of detection is reduced in big degree.Meanwhile relevant apparatus will not interrupt during the work time, it is ensured that initial optical signal
Integrality.And application is strong, resolution is good, production is simple and easy to use.
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 (8)
1. a kind of polarize resolving device in line vector based on tunnelling ray waveguide characterized by comprising two bound mode waveguides,
One tunnelling ray waveguide and detector array；
The tunnelling ray waveguide is mold leakage type waveguide, for leaking the part optical signals of its sandwich layer；The tunnelling ray waveguide
Both ends are respectively provided with the bound mode waveguide, are arranged with tunnelling ray Waveguide coaxial gapless, collectively form an optical channel；
The bound mode waveguide, tunnelling ray waveguide and optical path waveguiding structure to be differentiated match, and the bound mode waveguide is for leading
Enter and export the optical signal in optical path waveguide to be differentiated；
The detector array is arranged in tunnelling ray waveguide surface, by the identical photodetector of multiple performances around the tunnelling ray
Waveguide arranged radially composition, each detector is concordant in axial position, and the plane constituted is vertical with waveguide axis；For detect from
The optical signal that tunnelling ray waveguide core layer leaks；The detector array row detector number is N, and wherein M detector is constituted
One detector group, M are the integer more than or equal to 2, equal to the number of peak value in corresponding vector polarization mode formula far-field radiation pattern；
With in group detector, each detector placement is determined according to the far-field radiation pattern of respective vectors polarization mode；
The detector array shows Q detector group, and Q value is equal to the number of vector polarization mode formula to be differentiated；For only differentiating one
Q value is 2 for vector polarization in kind order mode, and Q value is equal to rank to be differentiated when differentiating the vector polarization of a variety of order modes
Twice of digital modeling number；
Wherein, in each detector group, the distribution of detector is different；Every group of detector distribution has corresponding vector to polarize
The corresponding relationship of the two is determined by calculation in mode, is set in advance corresponding to the required multiple groups for differentiating vector polarization mode formula
Detector；
When work, the distribution of the detector of signal is detected by observing, according to precalculated standard corresponding relationship, thus
Obtain the type of respective vectors polarization mode；Thus directed towards different polarization modes, multiple groups detector is set, to realize a variety of
The resolution of mode.
2. vector as described in claim 1 polarizes resolving device, which is characterized in that the axial position of the detector array can be
Axial direction or so translation, to better adapt to the resolution of the vector polarization mode in different rank mode.
3. a kind of basic mode resolving device based on the polarization resolving device of vector described in claim 1, which is characterized in that the detector array
There are two detector group, every group of two detectors to be symmetricly set on horizontal or vertical direction about waveguide axis for column.
4. basic mode resolving device as claimed in claim 3, which is characterized in that each comfortable axis of detector in two groups of detector arrays
It is had differences to concordant but concordant position.
5. basic mode resolving device as claimed in claim 4, which is characterized in that the axial flush position of the detector array is by right
It answers mode order to determine, is determined by calculation.
6. a kind of second order mode resolving device based on the polarization resolving device of vector described in claim 1, which is characterized in that the detector
There are two detector group, any detector groups to be made of four detectors for array, and four detectors are in 90 degree about waveguide axis
Angle is symmetrical arranged.
7. second order mode resolving device as claimed in claim 6, which is characterized in that each leisure of detector in two groups of detector arrays
It is axial concordant, but concordant position has differences.
8. second order mode resolving device as claimed in claim 7, which is characterized in that the axial flush position of the detector array by
Associative mode order determines, is determined by calculation.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4146298A (en) * | 1977-03-01 | 1979-03-27 | The United States Of America As Represented By The Secretary Of The Army | Coupler for optical fiber waveguides and method of constructing same |
| CN1441271A (en) * | 2002-02-27 | 2003-09-10 | 中国科学院半导体研究所 | Waveguide type polarization mode separator |
| CN203759308U (en) * | 2013-04-18 | 2014-08-06 | 日立金属株式会社 | Communication light detection structure, communication light detection connector and communication light detection optical cable |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101788710A (en) * | 2010-03-15 | 2010-07-28 | 天津大学 | Design method of high-performance acoustic waveguide modulator |
| CN106842421B (en) * | 2017-03-23 | 2020-09-29 | 电子科技大学 | High-order super-mode direction coupling waveguide detector symmetrical in horizontal direction |
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- 2017-09-30 CN CN201710917252.4A patent/CN107656336B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4146298A (en) * | 1977-03-01 | 1979-03-27 | The United States Of America As Represented By The Secretary Of The Army | Coupler for optical fiber waveguides and method of constructing same |
| CN1441271A (en) * | 2002-02-27 | 2003-09-10 | 中国科学院半导体研究所 | Waveguide type polarization mode separator |
| CN203759308U (en) * | 2013-04-18 | 2014-08-06 | 日立金属株式会社 | Communication light detection structure, communication light detection connector and communication light detection optical cable |
Non-Patent Citations (1)
| Title |
|---|
| 一种非矩形截面对浅刻蚀SOI脊形波导侧向泄漏损耗的影响;张明 等;《光子学报》;20170731;第46卷(第7期);全文 |
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