CN104991309A - Method for compensating AWG polarization sensitivity - Google Patents

Method for compensating AWG polarization sensitivity Download PDF

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CN104991309A
CN104991309A CN201510213146.9A CN201510213146A CN104991309A CN 104991309 A CN104991309 A CN 104991309A CN 201510213146 A CN201510213146 A CN 201510213146A CN 104991309 A CN104991309 A CN 104991309A
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waveguide
awg
array
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CN104991309B (en
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王瑾
冒进斌
付旭
陆云清
许吉
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Nanjing Post and Telecommunication University
Nanjing University of Posts and Telecommunications
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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
    • G02B6/12007—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 forming wavelength selective elements, e.g. multiplexer, demultiplexer
    • G02B6/12009—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 forming wavelength selective elements, e.g. multiplexer, demultiplexer comprising arrayed waveguide grating [AWG] devices, i.e. with a phased array of waveguides
    • 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
    • G02B6/124—Geodesic lenses or integrated gratings
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/26—Optical coupling means
    • G02B6/27—Optical coupling means with polarisation selective and adjusting means
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 

Abstract

The invention discloses a method for compensating AWG (Arrayed Waveguide Grating) polarization sensitivity. A half wave plate is added in the central section of an arrayed waveguide zone to realize the inversion between a TE mode and a TM mode; meanwhile electrodes are introduced into an input panel waveguide zone and an output panel waveguide zone; temperatures of the input panel waveguide zone and the output panel waveguide zone can be changed by utilizing material thermo-optic effects, so as to change corresponding birefringence and thereby compensate residual polarization sensitivity after using the half wave plate. Compared with a traditional method of eliminating AWG polarization sensitivity by employing a half wave plate, the method of the invention breaks the limitation of only employing a half wave plate to eliminate polarization sensitivity, solves the problem of overcompensation or undercompensation caused by a nonideal half wave plate position, etc., is suitable for AWGs of various structures, and has the advantages of simple structure, adjustable temperature control, etc.

Description

A kind of method of compensated array waveguide optical grating polarization sensitivity
Technical field
The present invention relates to array waveguide grating, be specifically related to a kind of method of compensated array waveguide optical grating polarization sensitivity.
Background technology
In technical field of photo communication, the device realizing wavelength-division multiplex technique has a lot, mainly contains dielectric multi-layer optical thin film Wave decomposing multiplexer, Fiber Bragg Grating FBG Wave decomposing multiplexer, etched diffraction grating Wave decomposing multiplexer and array waveguide grating (AWG:Arrayed Waveguide Grating) Wave decomposing multiplexer.Compared to other Wave decomposing multiplexers, AWG has flexible design, and insertion loss is low, and filtering characteristic is good, and performance is steady in a long-term, and easily and the advantage such as optical fiber efficient coupling.
Polarization-Sensitive sex chromosome mosaicism is problem very crucial in AWG application always.Because flashlight is after the transmission of general single mode grating, will there is random variation in polarization state.Therefore, for the optical device on fibre circuit, polarization insensitive just becomes extremely important.But; in actual applications; optical waveguide in light path often can show different transport propertys for different incoming polarization state; this mainly in waveguide transverse electric mode (TE) different from the propagation constant of transverse magnetic wave (TM); the picture point of the light of TE mould and TM mould on imaging surface is caused to offset; namely polarization dependent wavelength drift PD λ S (PD λ S:Polarization Dependent wavelength Shift) is produced; thus make that the frequency spectrum of passage is corresponding to be offset, the polarization sensitivity of Here it is so-called array waveguide grating.The polarization dependent wavelength drift that this characteristic is brought can make a significant impact transmission system, and deteriorated signal transmission increases the bit error rate of optical communication system.Therefore, in order to improve the performance of AWG, its polarization sensitivity must be eliminated.
At present, the polarization compensation technology about AWG reported both at home and abroad mainly contains: free of birefringence waveguide method, the order of diffraction time matching method, polarization beam splitting method, half-wave plate method etc.
Free of birefringence waveguide method is the polarization sensitivity adopting the insensitive waveguiding structure of polarization to reduce AWG.The people such as J.B.D.Soole consider and cause the main cause of waveguide birefringence to be waveguiding structure, (J.B.D.Soole, et al.Polarisation-independent InP arrayed waveguide filter using square cross-section waveguides [J] .Electronics Letters, 1996, Vol.32No.4.) use the waveguide with the free of birefringence of square sectional on this basis, eliminate the polarization sensitivity of AWG.But the method is difficult to the AWG polarization sensitivity that elimination birefringent material causes.
The order of diffraction time matching method is for the secondary difference of the different polarization states order of diffraction in AWG, reduces AWG polarization sensitivity by the waveguiding structure changing AWG.Recent years, the people such as K.Maru (K Maru, et al.Silica-based 2.5%-Δ arrayed waveguide grating using simple polarisation compensation method with core width adjustment [J] .Electronics Letters, 2007, Vol.43No.1.) propose the width changing every root Waveguide array in AWG Waveguide array district, thus compensate the polarization sensitivity of waveguide.But the method is merely able to birefringence corresponding to partial-compensation waveguiding structure, and limited for the compensation ability of material birefringence.The people such as Zou Jun (Z Jun, et al.Ultra-Compact Birefringence Compensated Arrayed Waveguide Grating Triplexer Based on Silicon-On-Insulator [J] .Journal of Lightwave Technology, 2013, VOL.31, NO.12.) the different Waveguide array district order of diffraction time is used to the light beam of different polarization states and carrys out the birefringence of compensated array waveguide section in conjunction with the geometry birefringence of waveguide zone.But in waveguide zone, the separation of two kinds of polarization states realizes by changing waveguide zone geometry, and this can reduce the performance of device.
Polarization beam splitting method be to TE (Transverse electricity mould) or TM (transverse magnetic wave) light beam carry out certain process.Such as, by settling Faraday rotator before the catoptron of folded waveguide grating array in national inventing patent (ZL03118878.8) " folded waveguide grating array that polarization is irrelevant ", original TE light beam is made to become TM light beam, original TM light beam becomes TE light beam, thus realizes polarization insensitive.Introducing due to additional devices can increase complicacy and the cost of device, and the factor such as technique, and the method can not ensure device performance.
At present, in AWG polarization compensation technology, adding half-wave plate in AWG central authorities is comparatively successful method.People (the H Takahashi such as H Takahashi, et al.Polarization-insensitive arrayed-waveguide grating wavelength multiplexer on silicon [J] .Optics Letters, 1992, Vol.17, No.7.) vertically open a narrow groove in the centre position of AWG, half-wave plate is inserted therein, the main shaft of wave plate and waveguide surface angle at 45 °, the reversion of TM and TE polarization state can be realized, thus reduce polarization sensitivity.
Adopt above-mentioned AWG polarization dispersion compensation technique mostly to need to increase additional devices or extra processing step, make the making of device and technique become complicated, performance step-down, cost uprises, and residual waveguide birefringence is difficult to be compensated.Such as, in half-wave plate method, structure non complete symmetry before and after usual half-wave plate, fabrication error makes half-wave plate position can not be placed in the middle, crosstalk between TE, TM pattern and half-wave plate are only effective to a wavelength range, these factors cause half-wave plate method not ensure full remuneration polarization dependent wavelength drifts about.
Summary of the invention
For above-mentioned technical matters, the invention provides following technical scheme:
A method for compensated array waveguide optical grating polarization sensitivity, its step is as follows:
Step one: insert half-wave plate (6) in Waveguide array district (3) centre position of array waveguide grating AWG, make original TE polarization state pattern become TM polarization state pattern, original TM polarization state pattern becomes TE polarization state pattern;
Step 2: add electrode (7) respectively with output waveguide zone (4) in the input waveguide zone (2) of AWG, utilize the thermo-optic effect of material, change input waveguide zone (2) and realize optical asymmetric with the birefraction exporting waveguide zone (4), compensate the residual polarisation susceptibility inserting half-wave plate (6).
AWG described in step one is by input waveguide (1), input waveguide zone (2), Waveguide array district (3), output waveguide zone (4), and output waveguide (5) connects to form successively.
Two kinds of polarization states in AWG described in step one and the grating equation of TE polarization mode and TM polarization mode can be expressed as:
T E : n s i , T E d i x i R i + n g , T E P Δ L + n g , T M ( 1 - P ) Δ L - n s o , T M d o x o R o = mλ T E T M : n s i , T M d i x i R i + n g , T M P Δ L + n g , T E ( 1 - P ) Δ L - n s o , T E d o x o R o = mλ T E - - - ( 1 )
Wherein P represents half-wave plate location parameter on Waveguide array, and between 0 (starting position) to 1 (end position), 0.5 represents that half-wave plate (6) is in Waveguide array district (3) centre position; Δ L represents the length difference between adjacent array waveguide; M represents the order of diffraction time; λ tErepresent the centre wavelength of TE pattern; λ tMrepresent the centre wavelength of TM pattern; R irepresent input planar waveguide Rowland circle radius; R orepresent and export planar waveguide Rowland circle radius; x irepresent input position; x orepresent outgoing position; d irepresent Waveguide array input end waveguide separation; d orepresent Waveguide array output terminal waveguide separation;
The polarization sensitivity of a kind of described AWG of step can be expressed as:
P D λ S = L T E - L T M = B s i d i x i R i + ( 2 P - 1 ) B g Δ L + B s o d o x o R o - - - ( 2 )
Half-wave plate (6) is inserted in Waveguide array district (3) centre position, because structure non complete symmetry before and after half-wave plate, fabrication error make half-wave plate position crosstalk between two parties, between TE, TM pattern and half-wave plate only cause using half-wave plate (6) not drift about by full remuneration polarization dependent wavelength to factors such as a wavelength range are effective described in step one.
Realize the optical asymmetric of AWG described in step 2, can be derived by such as under type and obtain.Typical case AWG is symmetrical structure and R i=R o, d i=d o=d, for centre wavelength, input position equals outgoing position x i=-x o; Eliminate the polarization sensitivity of AWG, the centre wavelength of TE pattern equals the centre wavelength of TM pattern, namely
P D λ S = ( 2 P - 1 ) B g Δ L + dx i ( B s i - B s o ) R = 0 - - - ( 3 )
Wherein B grepresent that the effective refractive index of Waveguide array district TE, TM mould is poor, i.e. n g, TE-n g, TM; B sirepresent that the effective refractive index of dull and stereotyped district TE, TM mould of input is poor, i.e. n si, TE-n si, TM; B sorepresent that the effective refractive index of Waveguide array district TE, TM mould is poor, i.e. n so, TE-n so, TM;
Can find out according to formula (6), by regulating (B si_-B so) thus the residual polarisation susceptibility of AWG can be compensated.Regulate (B si-B so) add electrode (7) by the input waveguide zone (2) at AWG with output waveguide zone (4), utilize temperature to realize the impact of birefraction.
The input waveguide zone (2) of the AWG described in step 2 all contains top covering and substrate separately with output waveguide zone.
Described in step 2 input waveguide zone (2) with export that position that waveguide zone (4) adds electrode can be above its respective top covering, above substrate, left surface or right flank.
Accompanying drawing explanation
Fig. 1 theory structure schematic diagram of the present invention;
When Fig. 2 adds electrode above input (output) waveguide zone, the amplification profile of input (output) waveguide zone;
When Fig. 3 adds electrode above input (output) waveguide zone, the amplification plan view of input (output) waveguide zone;
When Fig. 4 adds electrode below input (output) waveguide zone, the amplification profile of input (output) waveguide zone;
When Fig. 5 adds electrode below input (output) waveguide zone, the amplification plan view of input (output) waveguide zone;
When Fig. 6 adds electrode on the right side of input (output) waveguide zone, the amplification profile of input (output) waveguide zone;
When Fig. 7 adds electrode on the right side of input (output) waveguide zone, the amplification plan view of input (output) waveguide zone;
When Fig. 8 adds electrode on the left of input (output) waveguide zone, the amplification profile of input (output) waveguide zone;
When Fig. 9 adds electrode on the left of input (output) waveguide zone, the amplification plan view of input (output) waveguide zone;
Figure 10 for polymeric material, the temperature variant schematic diagram of polymeric material birefringence;
Figure 11, for polymer A WG, changes and exports planar waveguide temperature elimination AWG polarization sensitivity;
Figure 12, for polymer A WG, changes input planar waveguide and eliminates temperature AWG polarization sensitivity;
In figure, 1 input waveguide; 2 input planar waveguides; 3 Waveguide arrays; 4 export planar waveguide; 5 output waveguides; 6 half-wave plates; 7 electrodes; 8 top coverings; 9 sandwich layers; 10 under-clad layers; 11 substrates
Embodiment:
The method of the said a kind of compensated array waveguide optical grating polarization sensitivity of the present invention, be the thermo-optic effect utilizing material, by regulating input waveguide zone (2) and the respective temperature change birefringence exporting waveguide zone (4), realize optical asymmetric, thus compensate the polarization sensitivity using half-wave plate (6) remained afterwards.
Again according to the practical situation (over-compensation: half-wave plate position is to the left of inserting half-wave plate (6), negative compensation: half-wave plate position is to the right) regulate input waveguide zone (2) and export the respective temperature of waveguide zone (4), change the birefringence of its correspondence, array waveguide grating polarization sensitivity can be eliminated completely.
Below in conjunction with accompanying drawing, the present invention is further elaborated:
Step one: insert half-wave plate (6) in Waveguide array district (3) centre position of array waveguide grating AWG, make original TE polarization state pattern become TM polarization state pattern, original TM polarization state pattern becomes TE polarization state pattern;
The grating equation of two kinds of polarization states in AWG described in step one and Transverse electricity mould (TE mould) and transverse magnetic wave (TM mould) can be expressed as:
T E : n s i , T E d i x i R i + n g , T E P Δ L + n g , T M ( 1 - P ) Δ L - n s o , T M d o x o R o = mλ T E T M : n s i , T M d i x i R i + n g , T M P Δ L + n g , T E ( 1 - P ) Δ L - n s o , T E d o x o R o = mλ T E - - - ( 1 )
Wherein P represents half-wave plate location parameter on Waveguide array, and between 0 (starting position) to 1 (end position), 0.5 represents that half-wave plate (6) is in Waveguide array district (3) centre position; Δ L represents the length difference between adjacent array waveguide; M represents the order of diffraction time; λ tErepresent the centre wavelength of TE pattern; λ tMrepresent the centre wavelength of TM pattern; R irepresent input planar waveguide Rowland circle radius; R orepresent and export planar waveguide Rowland circle radius; x irepresent input position; x orepresent outgoing position; d irepresent Waveguide array input end waveguide separation; d orepresent Waveguide array output terminal waveguide separation;
The polarization sensitivity of a kind of described AWG of step can be expressed as:
P D λ S = L T E - L T M = B s i d i x i R i + ( 2 P - 1 ) B g Δ L + B s o d o x o R o - - - ( 5 )
Half-wave plate (6) is inserted in Waveguide array district (3) centre position, because structure non complete symmetry before and after half-wave plate, fabrication error make half-wave plate position crosstalk between two parties, between TE, TM pattern and half-wave plate only cause using half-wave plate (6) not drift about by full remuneration polarization dependent wavelength to factors such as a wavelength range are effective described in step one.
Step 2: add electrode (7) respectively with output waveguide zone (4) in the input waveguide zone (2) of AWG, utilize the thermo-optic effect of material, change input waveguide zone (2) and realize optical asymmetric with the birefraction exporting waveguide zone (4), compensate the residual polarisation susceptibility inserting half-wave plate (6).
Realize the optical asymmetric of AWG described in step 2, can be derived by such as under type and obtain.Typical case AWG is symmetrical structure and R i=R o, d i=d o=d, for centre wavelength, input position equals outgoing position x i=-x o; Eliminate the polarization sensitivity of AWG, the centre wavelength of TE pattern equals the centre wavelength of TM pattern, namely
P D λ S = ( 2 P - 1 ) B g Δ L + dx i ( B s i - B s o ) R = 0 - - - ( 6 )
Wherein B grepresent that the effective refractive index of Waveguide array district TE, TM mould is poor, i.e. n g, TE-n g, TM; B sirepresent that the effective refractive index of dull and stereotyped district TE, TM mould of input is poor, i.e. n si, TE-n si, TM; B sorepresent that the effective refractive index of Waveguide array district TE, TM mould is poor, i.e. n so, TE-n so, TM;
Can find out according to formula (6), if half-wave plate is positioned at center and the P=0.5 of symmetrical AWG structure, and the birefraction of input, output planar waveguide is consistent, and formula (6) can be set up completely.But fabrication error makes half-wave plate position may not necessarily be placed in the middle, makes P be not equal to 0.5.Depart from AWG centre position when half-wave plate position and near input waveguide zone, i.e. P<0.5, cause under-compensation phenomenon (i.e. PD λ S<0); In like manner, when AWG centre position is departed from and close output waveguide zone in half-wave plate position, namely during P>0.5, over-compensation phenomenon (PD λ S>0) is caused.It is worth mentioning that, residual polarization sensitivity is not only caused by undesirable half-wave plate position, also can be caused by structure non complete symmetry before and after half-wave plate, i.e. R i≠ R o, d i≠ d o; In addition, half-wave plate rotates polarized light and only effectively also can cause still there is residual polarization sensitivity at the service band of AWG at a wavelength range.In these cases can by regulating (B si_-B so) thus realize the polarization sensitivity eliminating AWG completely.Regulate (B si-B so) add electrode (7) by the input waveguide zone (2) at AWG with output waveguide zone (4), utilize temperature to realize the impact of birefraction.
Here for the AWG based on polymeric material, the birefringence of polymeric material itself is less, but polymer A WG still presents certain polarization sensitivity.The birefringence B of polymeric material and the relation of temperature T can draw (J.Wang by Fig. 6, et al.Polarization insensitive 25-Gbaud direct D (Q) PSK receiver based on polymer planar lightwave hybrid integration platform [J] .Optics Express, 2011, Vol.19, No.13.)
B(T)＝10 -3+k(T-20) (7)
Wherein constant k=-5 × 10 -6/ DEG C, therefore formula (6) can be expressed as:
( 2 P - 1 ) B g &Delta; L + kdx i ( T i - T o ) R = 0 - - - ( 8 )
T orepresent the temperature exporting planar waveguide; T irepresent the temperature of input planar waveguide.
In sum, due to fabrication error, in AWG, the position of half-wave plate is not quite similar, to this by the temperature difference T regulating input waveguide zone (2) and export between waveguide zone (4) o-T i, just can eliminate the polarization sensitivity of AWG;
The present invention adopts in input waveguide zone (2), exports above waveguide zone (4) top covering (as shown in Figure 3), right flank (as shown in Figure 4) or left surface (as shown in Figure 5) below (as shown in Figure 2), under-clad layer and add shown in a cube electrode, change input waveguide zone (2) and the temperature exporting waveguide zone (4) by electrode, finally realize temperature and control to eliminate array waveguide grating polarization sensitivity.
Provide the present invention below for two of polymer A WG analog results, wherein R=1000um, Δ L=20um, x i=200um, d=20um, B g=10 -3;
As P=0.49, by calculating T o-T i=20 DEG C, if when the temperature of input planar waveguide remains on 20 DEG C, export planar waveguide temperature as long as increase, reach T o=40 DEG C, eliminate polarization sensitivity theoretically, by transition function analog result as shown in Figure 7; In like manner, as P=0.51, by calculating T o-T i=-20 DEG C, its analog result as shown in Figure 8.From result display, change input planar waveguide and can eliminate array waveguide grating polarization sensitivity completely with the temperature exporting planar waveguide.
The invention provides one and utilize thermo-optic effect, by regulating waveguide temperature, to eliminate the method for array waveguide grating polarization sensitivity, break through the limitation of conventional polarization dispersion compensation technology, realize positive and negative adjustable elimination residual polarisation susceptibility, be applicable to the array waveguide grating of various structure, there is structure simple, the advantages such as temperature control is adjustable.

Claims (7)

1. a method for compensated array waveguide optical grating polarization sensitivity, its step is as follows:
Step one: insert half-wave plate in the centre position, Waveguide array district of array waveguide grating AWG, make original TE polarization state pattern become TM polarization state pattern, original TM polarization state pattern becomes TE polarization state pattern;
Step 2: add electrode respectively with output waveguide zone in the input waveguide zone of AWG, utilize the thermo-optic effect of material, change input waveguide zone and realize optical asymmetric with the birefraction exporting waveguide zone (4), compensate the residual polarisation susceptibility inserting half-wave plate.
2. the method for a kind of compensated array waveguide optical grating polarization sensitivity according to claim 1, it is characterized in that the AWG described in step one is by input waveguide, input waveguide zone, Waveguide array district, output waveguide zone, and output waveguide connects to form successively.
3. the method for a kind of compensated array waveguide optical grating polarization sensitivity according to claim 1, is characterized in that the grating equation of two kinds of polarization states in AWG described in step one and TE polarization mode and TM polarization mode can be expressed as:
Wherein P represents half-wave plate location parameter on Waveguide array, and between 0 (starting position) to 1 (end position), 0.5 represents that half-wave plate (6) is in Waveguide array district (3) centre position; Δ L represents the length difference between adjacent array waveguide; M represents the order of diffraction time; λ tErepresent the centre wavelength of TE pattern; λ tMrepresent the centre wavelength of TM pattern; R irepresent input planar waveguide Rowland circle radius; R orepresent and export planar waveguide Rowland circle radius;
X irepresent input position; x orepresent outgoing position; d irepresent Waveguide array input end waveguide separation; d orepresent Waveguide array output terminal waveguide separation.
4. the method for a kind of compensated array waveguide optical grating polarization sensitivity according to claim 1, is characterized in that the polarization sensitivity of AWG described in step 2 can be expressed as:
5. the method for a kind of compensated array waveguide optical grating polarization sensitivity according to claim 1, is characterized in that the optical asymmetric realizing AWG described in step 2, can be derived obtain by such as under type; Typical case AWG is symmetrical structure and R i=R o, d i=d o=d, for centre wavelength, input position equals outgoing position x i=-x o; Eliminate the polarization sensitivity of AWG, the centre wavelength of TE pattern equals the centre wavelength of TM pattern, namely
Wherein B grepresent that the effective refractive index of Waveguide array district TE, TM mould is poor, i.e. n g, TE-n g, TM; B sirepresent that the effective refractive index of dull and stereotyped district TE, TM mould of input is poor, i.e. n si, TE-n si, TM; B sorepresent that the effective refractive index of Waveguide array district TE, TM mould is poor, i.e. n so, TE-n so, TM;
Can find out according to formula (3), by regulating (B si_-B so) thus the residual polarisation susceptibility of AWG can be compensated; Regulate (B si-B so) add electrode (7) by the input waveguide zone (2) at AWG with output waveguide zone (4), utilize temperature to realize the impact of birefraction.
6. the method for a kind of compensated array waveguide optical grating polarization sensitivity according to claim 1, is characterized in that the input waveguide zone of the AWG described in step 2 and exports waveguide zone and all contain top covering and substrate separately.
7. the method for a kind of compensated array waveguide optical grating polarization sensitivity according to claim 1, it is characterized in that described in step 2 in input waveguide zone and the position exporting waveguide zone and add electrode can be above its respective top covering, above substrate, left surface or right flank.
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CN101952752A (en) * 2008-02-22 2011-01-19 Ntt电子股份有限公司 Waveguide mode optical equipment

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021244259A1 (en) * 2020-05-30 2021-12-09 华为技术有限公司 Grating, and characteristic adjustment method and device therefor
CN115857097A (en) * 2023-02-21 2023-03-28 苏州旭创科技有限公司 Array waveguide grating

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