CN107656336A - 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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- CN107656336A CN107656336A CN201710917252.4A CN201710917252A CN107656336A CN 107656336 A CN107656336 A CN 107656336A CN 201710917252 A CN201710917252 A CN 201710917252A CN 107656336 A CN107656336 A CN 107656336A
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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
- G02B6/10—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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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/04—Mode multiplex systems
Abstract
Resolving device is polarized in line vector based on tunnelling ray waveguide the invention discloses a kind of, including：Two bound mode waveguides, a tunnelling ray waveguide, and detector array；Bound mode waveguide is the waveguide to match with light path waveguiding structure to be differentiated, for importing and exporting the optical signal of light 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 compact profile and perfect function, and makes simple, easy to use.It can realize optical signal in transmitting procedure, low damage and continuously detection vector polarization, and the information of waveguide core layer is hidden in extraction.Meanwhile relevant apparatus will not be interrupted during work, it is possible to achieve the online resolution of vector polarization, and resolution is preferable, and the degree of accuracy is higher.
Description
Technical field
The invention belongs to optical communication field, optics 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 technology
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, the concept of leakage mode is proposed first.Together
Year, Marcuvitz article " On field representations in terms of leaky modes or
Eigenmodes ", pattern and the potential well analogy in quantum mechanics are will leak out for the first time, and point out that existing wave equation is only capable of retouching
Stating leakage mode has the field of central area of complex propagation constant, and this is increased with exponential form at unlimited horizontal space
It is long.Then, increasing researcher is begun one's study tunnelling ray waveguide, and the characteristic such as its dispersion and loss is applied into optics
Communication.
Pattern differentiates the important way as analysis extraction optical information, is widely used in laser, sensing, coupling and light
The various fields such as fiber communication, and it is a kind of analysis mode finer during pattern is differentiated to polarize resolution, it can be distinguished with not
With the pattern 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 two-way identical optical signal, recycle top layer
Waveguiding structure covered with metal causes to the Different Effects of transverse electric field (TE) pattern and transverse magnetic (TM) pattern effective refractive index
The different polarization pattern acquisition out of phase of two ways of optical signals is poor, and two ways of optical signals finally is input into three-dB coupler, different phases
Position signal will export from different ports, it is achieved thereby that the separation of different polarization pattern.As can be seen that foregoing invention is one
Independent optical signal polarization mode separating extraction device, it can not differentiate pattern in real time, and the polarization mode separated is limited, also
The integrality of initial signal is destroyed to a certain extent.
The content of the invention
For the disadvantages described above or Improvement requirement of prior art, the invention provides a kind of based on the online of tunnelling ray waveguide
Vector polarizes resolving device, and its object is to distinguish the pattern with different vectors polarization in real time, it is intended to solves existing polarization point
Distinguish that non-online, resolving device prepares complicated technical problem.
To achieve the above object, resolving device, bag are polarized in line vector based on tunnelling ray waveguide the invention provides a kind of
Include：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 a bound mode waveguide, and it is set with tunnelling ray Waveguide coaxial gapless, collectively forms a light
Passage；
The bound mode waveguide, tunnelling ray waveguide and light path waveguiding structure to be differentiated match, and the bound mode waveguide is used
In importing and export the optical signal in light path waveguide to be differentiated；
The detector array is arranged on tunnelling ray waveguide surface, is let out by multiple performance identical photodetectors around described
Stripping pattern waveguide arranged radially forms, and each detector is concordant in axial location, and the plane that it is formed 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 forms 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, M beam light leaks be present, the angle between each leakage light beam and waveguide core axle is the same, but position is different, similar to circle
Cone.
Further, the detector array shows Q detector group, and Q values are equal to the number of vector polarization mode formula to be differentiated；
Q values are 2 for only differentiating a kind of polarization of the vector in exponent number pattern, Q values when differentiating the vector polarization of a variety of exponent number patterns
Equal to twice of exponent number 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, and this is that the feature of pattern in itself determines that we obtain this feature by observing far-field radiation pattern；Every group of spy
Surveying device distribution has corresponding vector polarization mode formula, determines both corresponding relations by calculating, sets correspond in advance
The required multigroup detector for differentiating vector polarization mode formula.
Further, a kind of basic mode resolving device based on vector polarization resolving device, it is characterised in that the detector
Array has two detector groups, and every group of two detectors are symmetricly set on horizontal or vertical direction on waveguide axis.
Further, a kind of second order mode resolving device based on vector polarization resolving device, it is characterised in that the detection
Device array has two detector groups, and any detector group is made up of four detectors, and four detectors are in 90 on waveguide axis
Degree angle is symmetrical arranged.
Further, the vector polarization resolving device of the specific exponent number pattern, it is characterised in that two groups of detector arrays
Each comfortable axial concordant but concordant position of detector in row has differences.
Further, the vector polarization resolving device detector array of the specific exponent number pattern, it is characterised in that the axle
Determined, can be determined by calculating by associative mode exponent number to flush position.
Further, the axial location of the detector array can translate left and right in the axial direction, to adapt to difference
The resolution of vector polarization mode in exponent number pattern.
In use, the bound mode waveguide at resolving device both ends is docked with light path waveguide to be differentiated, because the knot of each waveguide
Structure matches, so most of couples optical energy in light path waveguide to be differentiated enters tunnelling ray waveguide, small part optical signal is from letting out
Stripping pattern waveguide core layer leaks to be detected by photodetector.Light path ripple to be differentiated wherein has been contained in small part optical signal
The whole vector polarization mode formula of sandwich layer is led, because the far-field radiation pattern of different vector polarization mode formulas is different, detector can ring
The position answered also is differed, therefore a kind of distribution of far-field radiation pattern peak value can be corresponded to according to a detector group, and multiple spies
The criterion of one 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 the detector for detecting signal is examined, according to the standard corresponding relation predefined, so as to show that respective vectors polarize
The species of pattern..
The present invention has compact profile and perfect function, and makes simple, easy to use.It can realize that light 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 light path in advance, so relevant apparatus will not interrupt in the course of the work, initial optical signal also will not
It is destroyed, it can be differentiated in real time.In addition, the vector polarization resolution of the present invention in the course of the work is relatively preferable,
Difference is obvious between different vector polarization mode formulas, therefore the degree of accuracy is high.
Brief description of the drawings
Fig. 1 is the structural representation 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 each even illumination and odd mode
Distribution map.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
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 representation of vector polarization resolving device of the present invention, and wherein bound mode waveguide have selected general step wave
Lead, tunnelling ray waveguide have selected the leakage waveguide of W types, 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；The leakage waveguide of W types has two coverings, and the refractive index of sandwich layer and surrounding layer is
N1, the refractive index of inner cladding is n0；Wherein n1>n0.The thickness of two kinds of waveguide core layers is identical, is set to a；The inner cladding of W-type guide
Thickness is set to d；Wavelength is λ.Because bound mode waveguide and tunnelling ray waveguide match, so most of couples optical energy enters tunnelling ray
Waveguide.Then the slip of leakage mode is changed by changing d size 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 types leakage waveguide that we have further obtained
Leakage mode electric field and the longitudinal component expression formula in magnetic field：
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 represents the exponent number of each function.And I takes 1,2,3；I represents i-th layer of tunnelling ray waveguide, niIt is i-th layer of refraction
Rate, kiIt is i-th layer of wave vector, ki⊥Represent its vertically component with waveguide axis, k0Free space wave number is represented, β is pattern
Complex propagation constant；φ is the angle for leaking light beam and waveguide core axle, and ε is dielectric constant；Z0It is vacuum impedance；R represents mould field
To the distance of waveguide core axle.Using the continuity on border, obtain the characteristic equation of MX=0 forms, X=[A, B, C, D, a, b,
c、d]T, M is the matrix according to derived from above-mentioned piecewise function continuous institute at the node, and relevant with variable β, m, L, L is this feature side
The l-th root of journey.As can be seen that the longitudinal component in the timings of exponent number m mono-, leakage mode electric field and magnetic field has even number and odd number
Solution.In order to further discriminate between even number and odd mode, we are studied the far-field radiation pattern for leaking waveguide, and are utilized and hidden
Information in radiation diagram come identify both of which (by formula can with known function come simulate that W types reveal mould waveguide 0
Mode distributions, also two kinds of different solutions be present by the way that β or the timings of m mono- is calculated).
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 species leakage mode cross section.Work as m=1, during L=1 or 2, corresponding to the basic mode of two cross-polarization, lead to
Cross simulation calculation and obtain the sandwich layer energy profile and corresponding far-field distribution figure of two basic modes each 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 in tunnelling ray waveguide surface and horizontal or vertical direction with the intersection of axis vertical plane.Cause
This, we visit four photodetectors of placement in tunnelling ray waveguide surface and intersection with axis vertical plane to light intensity
Survey, it is possible to being distributed to contrast its standard corresponding relation with cross-polarization basic mode for the detector of signal is detected by observation
Draw the species of respective vectors polarization mode.
Work as m=2, during L=1 or 2, corresponding to two second order polarization modes, two second orders are obtained by simulation calculation and polarized
The sandwich layer energy profile and corresponding far-field distribution figure of pattern each 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
Surface and there is large energy with the ad-hoc location of the intersection of axis vertical plane.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 on ripple
Guide shaft line is symmetrical arranged in 90 degree of angles, it is possible to contrasts itself and second order by observing the distribution for the detector for detecting signal
The standard corresponding relation of polarization mode draws the species of respective vectors polarization mode.
For m>2 situation is similar to the above, the vector polarization resolving device of different rank pattern, in its detector array
Detector is each comfortable axially concordant, but axially concordant position is determined by associative mode exponent number, can be determined by calculating.And
The axial location can translate left and right in the axial direction, to adapt to the resolution of the vector polarization mode in different rank pattern.We
Designed vector polarization resolving device can only differentiate a kind of vector polarization of exponent number pattern, can also differentiate a variety of exponent number patterns
Vector polarization.
Low damage and continuously detection vector polarization can be realized by polarizing resolving device by the vector obtained with upper type, can be very
The complexity of detection is reduced in big degree.Meanwhile relevant apparatus will not interrupt in the course of the work, it is ensured that initial optical signal
Integrality.And application is strong, resolution is good, making 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, all any modification, equivalent and improvement made within the spirit and principles of the invention etc., all should be included
Within protection scope of the present invention.
Claims (8)
1. a kind of polarize resolving device based on tunnelling ray waveguide in line vector, it is characterised in that including：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 a bound mode waveguide, and it is set with tunnelling ray Waveguide coaxial gapless, collectively forms an optical channel；
The bound mode waveguide, tunnelling ray waveguide and light path waveguiding structure to be differentiated match, and the bound mode waveguide is used to lead
Enter and export the optical signal in light path waveguide to be differentiated；
The detector array is arranged on tunnelling ray waveguide surface, by multiple performance identical photodetectors around the tunnelling ray
Waveguide arranged radially forms, and each detector is concordant in axial location, and the plane that it is formed is vertical with waveguide axis；For detect from
The optical signal that tunnelling ray waveguide core layer leaks.
2. vector as claimed in claim 1 polarizes resolving device, it is characterised in that the detector array row detector number is N,
Wherein M detector forms a detector group, and M is the integer more than or equal to 2, equal to corresponding vector polarization mode formula far field spoke
Penetrate the number of peak value in figure；With in group detector, each detector placement is the far field spoke according to respective vectors polarization mode
Figure is penetrated to determine.
3. vector as claimed in claim 2 polarizes resolving device, it is characterised in that the detector array shows Q detector group,
Q values are equal to the number of vector polarization mode formula to be differentiated；Q values are 2 for only differentiating a kind of polarization of the vector in exponent number pattern,
Twice of Q values equal to exponent number number of modes to be differentiated when differentiating the vector polarization of a variety of exponent number patterns；
Wherein, in each detector group, the distribution of detector is different；Every group of detector distribution has corresponding vector to polarize
Pattern, both corresponding relations are determined by calculating, set differentiate the multigroup of vector polarization mode formula corresponding to required in advance
Detector；
During work, the distribution of the detector of signal can be detected by observation, according to precalculated standard corresponding relation,
So as to draw the species of respective vectors polarization mode；Thus directed towards different polarization modes, multigroup detector is set, so as to realize
The resolution of various modes.
A kind of 4. basic mode resolving device based on any vector polarization resolving devices of claim 1-3, it is characterised in that the spy
Surveying device array has two detector groups, and every group of two detectors are symmetricly set on horizontal or vertical direction on waveguide axis.
5. a kind of second order mode resolving device based on any vector polarization resolving devices of claim 1-3, it is characterised in that described
Detector array shows two detector groups, and any detector group is made up of four detectors, and four detectors are on waveguide axis
It is symmetrical arranged in 90 degree of angles.
6. the vector polarization resolving device of the specific exponent number pattern as described in claim 4,5, it is characterised in that two groups of detections
Each comfortable axial concordant but concordant position of detector in device array has differences.
7. vector as claimed in claim 6 polarizes resolving device, it is characterised in that the axial flush position of the detector array by
Associative mode exponent number determines, can be determined by calculating.
8. vector polarizes resolving device as described in claim 1-3 is any, it is characterised in that the axial location of the detector array
It can translate left and right in the axial direction, to better adapt to the resolution of the vector polarization mode in different rank pattern.
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Citations (5)
| 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 |
| CN101788710A (en) * | 2010-03-15 | 2010-07-28 | 天津大学 | Design method of high-performance acoustic waveguide modulator |
| 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 |
| CN106842421A (en) * | 2017-03-23 | 2017-06-13 | 电子科技大学 | A kind of symmetrical high-order super model direction coupled waveguide detector of horizontal direction |
-
2017
- 2017-09-30 CN CN201710917252.4A patent/CN107656336B/en active Active
Patent Citations (5)
| 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 |
| CN101788710A (en) * | 2010-03-15 | 2010-07-28 | 天津大学 | Design method of high-performance acoustic waveguide modulator |
| 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 |
| CN106842421A (en) * | 2017-03-23 | 2017-06-13 | 电子科技大学 | A kind of symmetrical high-order super model direction coupled waveguide detector of horizontal direction |
Non-Patent Citations (1)
| Title |
|---|
| 张明 等: "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", 《光子学报》 * |
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