CN211669401U - Active polarization rotator realized based on mixed surface plasma groove waveguide - Google Patents

Active polarization rotator realized based on mixed surface plasma groove waveguide Download PDF

Info

Publication number
CN211669401U
CN211669401U CN202020407403.9U CN202020407403U CN211669401U CN 211669401 U CN211669401 U CN 211669401U CN 202020407403 U CN202020407403 U CN 202020407403U CN 211669401 U CN211669401 U CN 211669401U
Authority
CN
China
Prior art keywords
polarization
waveguide
surface plasma
mixed surface
width
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN202020407403.9U
Other languages
Chinese (zh)
Inventor
周治平
陈睿轩
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Beijing Aijie Photoelectric Technology Co ltd
Peking University Shenzhen Graduate School
Original Assignee
Beijing Aijie Photoelectric Technology Co ltd
Peking University Shenzhen Graduate School
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Beijing Aijie Photoelectric Technology Co ltd, Peking University Shenzhen Graduate School filed Critical Beijing Aijie Photoelectric Technology Co ltd
Priority to CN202020407403.9U priority Critical patent/CN211669401U/en
Application granted granted Critical
Publication of CN211669401U publication Critical patent/CN211669401U/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Landscapes

  • Optical Integrated Circuits (AREA)

Abstract

The utility model discloses an active polarization rotator based on mixed surface plasma groove waveguide realizes, including power beam splitter, MZI phase modulation unit, polarization rotation control unit and close the bundle ware, polarization rotation control unit is including mixing surface plasma groove waveguide, mixed surface plasma groove waveguide has certain groove width, just two medium waveguides of mixed surface plasma groove waveguide all have certain width, just the both sides interval certain distance of mixed surface plasma groove waveguide all is provided with a material that possesses the metallic characteristic that has certain thickness, length and width. The utility model has the advantages that the structure is simplified, and polarization conversion loss is little and can both realize the active regulation and control of output light polarization state to the incident light of two kinds of different polarization states.

Description

Active polarization rotator realized based on mixed surface plasma groove waveguide
Technical Field
The utility model relates to an active polarization rotator based on mixed surface plasma groove waveguide realizes.
Background
The polarization diversity scheme is a main method for solving the problem of polarization sensitivity of an optical path, and one of the most main core devices in the scheme is a polarization rotator which can ensure that a subsequent optical path only contains a signal in one polarization state, so that the design and optimization of a functional device are simplified. By introducing asymmetry of a waveguide structure, a traditional polarization rotator can only realize passive conversion between fixed polarization states, and time-domain change of the polarization states needs to be realized in a plurality of application scenarios such as control of polarization states of output light of an on-chip laser, biosensing, polarization multiplexing and the like. Referring to the similar design idea of the on-chip adjustable polarization controller, the current mainstream scheme is composed of a sandwich structure in which two passive polarization rotators sandwich a polarization-dependent phase shifter. In a thirty-five material platform, polarization-dependent phase shift is realized by utilizing a polarization-dependent energy level filling effect; on the silicon-based platform, the upper surface of the waveguide is coated with a negative thermo-optic coefficient material to realize polarization-dependent phase shift. Although the scheme can regulate and control any state of output polarized light and can be used as an implementation scheme of an active polarization rotator, the structure is complex, and the polarization conversion loss is large.
SUMMERY OF THE UTILITY MODEL
In order to solve the above technical problem, the present invention provides an active polarization rotator based on hybrid surface plasmon polariton waveguide, which is cut in from the angle of mode conversion, and uses the abundant mode input and output corresponding relation of hybrid surface plasmon polariton waveguide to establish the relation between the turning of the output light polarization state and the relative phase difference between the output light waveguides. In addition, mix surface plasmon slot waveguide and have the characteristics of undersize, when breaking the structure symmetry, can not introduce very big loss, and then can realize high-efficient, the active polarization circulator that hangs down, the utility model discloses a following technical scheme:
the utility model provides an active polarization rotator based on mixed surface plasmon slot waveguide realizes, includes power beam splitter, MZI phase modulation unit, polarization rotation control unit and beam combiner, polarization rotation control unit includes mixed surface plasmon slot waveguide, mixed surface plasmon slot waveguide has certain groove width, and two dielectric waveguides of mixed surface plasmon slot waveguide all have certain width, just the both sides of mixed surface plasmon slot waveguide are separated certain distance and are all provided with the material that possesses the metallic characteristic that has certain thickness, length and width.
Furthermore, the structural design parameters of the material with the metal characteristics are reasonably optimized, so that the conversion efficiency of the polarization state of output light is highest, and the polarization-dependent loss is minimum; the dynamic inversion of the polarization state of the output light is realized by changing the relative phase difference between the two paths of light waves, and the structural design parameters comprise the width and the thickness of a material with metal characteristics, the distance between the material with metal characteristics and the side wall of the dielectric slot waveguide, the distance between the material with metal characteristics and the plane of the bottom of the dielectric slot waveguide, the width and the width of the dielectric slot waveguide, the length of the material with metal characteristics and the like.
Further, the mixed surface plasmon polariton waveguide body composition material contained in the polarization rotation control unit is a medium suitable for use as a waveguide system, such as silicon, silicon nitride, quartz, etc., and a material suitable for constituting a surface plasmon waveguide and having a metallic property, and the material having a metallic property may be gold, aluminum, silver, zinc oxide, etc.
Further, the polarization rotation control unit includes a plurality of sets of correspondence between input modes and output modes, and specifically, there are four sets of correspondence as follows:
1. the input mode is
Figure BDA0002427349400000021
When the output mode is
Figure BDA0002427349400000022
And
Figure BDA0002427349400000023
2. the input mode is
Figure BDA0002427349400000024
When the output mode is
Figure BDA0002427349400000025
And
Figure BDA0002427349400000026
3. the input mode is
Figure BDA0002427349400000031
When the output mode is
Figure BDA0002427349400000032
And
Figure BDA0002427349400000033
4. the input mode is
Figure BDA0002427349400000034
When the output mode is
Figure BDA0002427349400000035
And
Figure BDA0002427349400000036
furthermore, in the hybrid surface plasmon polariton waveguide included in the polarization rotation control unit, the distribution position of the material having the metal characteristic is a position around the dielectric material, which is favorable for causing the polarization rotation control unit to have a corresponding relationship between a plurality of groups of input modes and output modes.
Further, the switching of the input mode of the polarization rotation control unit is realized by the MZI phase modulation unit.
Furthermore, the refractive index of the waveguide in the affected area is changed by adopting a thermal method, an electrical method or other methods, so that the relative phase difference of the two paths of light waves is changed.
Furthermore, the phase modulation mode of the MZI phase modulation unit is single-arm phase modulation or other phase modulation methods capable of leading two arms to generate relative phase difference.
Furthermore, when the relative phase difference is 0, the two paths are connected
Figure BDA0002427349400000037
The light is combined and enters the input end of the polarization rotation control unit to be converted into light
Figure BDA0002427349400000038
When the relative phase difference is pi, two paths
Figure BDA0002427349400000039
The light is combined and enters the input end of the polarization rotation control unit to be converted into light
Figure BDA00024273494000000310
Further, the dynamic regulation and control process of the polarization state of the output light of the whole waveguide system is as follows:
for TE polarization state input, an incident light mode is divided into two paths with the same phase by a power beam splitter
Figure BDA00024273494000000311
If the relative phase difference of the two paths of light waves under the influence of the phase modulation unit is
Figure BDA00024273494000000312
The waveguides are merged and then converted into
Figure BDA00024273494000000313
Output after passing through a polarization rotation control unit
Figure BDA00024273494000000314
And
Figure BDA00024273494000000315
because the first-order mode can not pass through the beam combiner formed by the Y branches, the final output light is still in a TE polarization state; if the relative phase difference of the two paths of light waves under the influence of the phase modulation unit is
Figure BDA00024273494000000316
The waveguides are merged and then converted into
Figure BDA00024273494000000317
Output after passing through a polarization rotation control unit
Figure BDA00024273494000000318
And
Figure BDA00024273494000000319
finally outputting light in a TM polarization state after a first-order high-order mode is filtered by a beam combiner;
for TM polarization state input, an incident light mode is divided into two paths with the same phase by a power beam splitter
Figure BDA00024273494000000320
If the relative phase difference of the two paths of light waves under the influence of the phase modulation unit is
Figure BDA00024273494000000321
The waveguides are merged and then converted into
Figure BDA00024273494000000322
Output after passing through a polarization rotation control unit
Figure BDA0002427349400000041
And
Figure BDA0002427349400000042
the first-order mode is filtered out through the beam combiner, so that the final output light is still in a TM polarization state; if the relative phase difference of the two paths of light waves under the influence of the phase modulation unit is
Figure BDA0002427349400000043
The waveguides are merged and then converted into
Figure BDA0002427349400000044
Output after passing through a polarization rotation control unit
Figure BDA0002427349400000045
And
Figure BDA0002427349400000046
and finally outputting light in a TE polarization state after a first-order high-order mode is filtered by the beam combiner.
Furthermore, two polarization states of output light of the whole waveguide system and two relative phase differences of two arms of the MZI phase modulation unit
Figure BDA0002427349400000047
And
Figure BDA0002427349400000048
present a one-to-one correspondence between
Further, the power splitter is a 50:50 power splitter.
Compared with the prior art, the utility model discloses a beneficial technological effect:
the corresponding relation of input light and output light of the mixed surface plasmon polariton is utilized to establish the relation between the inversion of two polarization states of the output light and the relative phase difference between the input waveguides. By optimizing the structural design parameters such as the width of the material having the metallic characteristic, the thickness of the material having the metallic characteristic, the distance between the material having the metallic characteristic and the side wall of the dielectric slot waveguide, the width of the slot, and the length of the material having the metallic characteristic, efficient switching of the polarization state and extremely small polarization dependent loss can be realized.
Drawings
The present invention will be further explained with reference to the following description of the drawings.
Fig. 1 is a schematic structural diagram of an active polarization rotator implemented based on a hybrid surface plasmon slot waveguide according to the present invention;
FIG. 2 is a schematic diagram of a polarization rotation control unit;
FIG. 3 is a graph of the relationship between the performance and structural parameters of an active polarization rotator under input of TM polarization state;
description of reference numerals: 1-a power splitter; a 2-MZI phase modulation unit; 3-a polarization rotation control unit; 301-dielectric waveguide; 302-a material with metallic properties; 4-a beam combiner.
Detailed Description
As shown in fig. 1 and 2, an active polarization rotator implemented based on a hybrid surface plasmon polariton includes a power beam splitter 1(50:50 power beam splitter), a phase modulation unit 2, a polarization rotation control unit 3 and a beam combiner 4, where the polarization rotation control unit 3 is implemented by the hybrid surface plasmon polariton shown in fig. 2, the hybrid surface plasmon polariton has a certain slot width, two dielectric waveguides 301 of the hybrid surface plasmon polariton have a certain width, and a material 302 with metal characteristics and having a certain thickness, length and width is disposed on two sides of the hybrid surface plasmon polariton at a certain distance. By reasonably optimizing the structural design parameters of the material 302 with the metal characteristics, the conversion efficiency of the polarization state of output light is highest and the polarization-dependent loss is minimum; the switching of the two polarization states of the output light is realized by changing the relative phase difference between the two paths of light waves.
Wherein the structural design parameters include the width and thickness of the material 302 with metallic properties, the distance between the material 302 with metallic properties and the sidewall of the dielectric waveguide 301, the width of the trench, the length of the material 302 with metallic properties, and the like.
The main component material (dielectric waveguide 301) of the hybrid surface plasmon polariton waveguide included in the polarization rotation control unit 3 is a material suitable for use as a medium of a waveguide system, such as silicon, silicon nitride, quartz, or the like, and a material suitable for constituting a surface plasmon waveguide and having metallic properties, and the material 302 having metallic properties may be gold, aluminum, silver, zinc oxide, or the like.
The input mode and the output mode of the polarization rotation control unit 3 have four sets of corresponding relations as follows:
1. the input mode is
Figure BDA0002427349400000051
When the output mode is
Figure BDA0002427349400000052
And
Figure BDA0002427349400000053
2. the input mode is
Figure BDA0002427349400000054
When the output mode is
Figure BDA0002427349400000055
And
Figure BDA0002427349400000056
3. the input mode is
Figure BDA0002427349400000057
When the output mode is
Figure BDA0002427349400000058
And
Figure BDA0002427349400000059
4. the input mode is
Figure BDA00024273494000000510
When the output mode is
Figure BDA00024273494000000511
And
Figure BDA00024273494000000512
the switching of the input mode of the polarization rotation control unit 3 is realized by the phase modulation unit 2. The refractive index of the waveguide in the affected area is changed by adopting a thermal method, an electrical method or other methods, so that the relative phase difference of the two paths of light waves is changed. The phase modulation mode of the MZI phase modulation unit 2 is single-arm phase modulation or other phase modulation methods which can cause two arms to generate relative phase difference.
When the relative phase difference is 0, two paths
Figure BDA0002427349400000061
The light is combined and enters the input end of the polarization rotation control unit 3 to be converted into
Figure BDA0002427349400000062
When the relative phase difference is pi, two paths
Figure BDA0002427349400000063
The light is combined and enters the input end of the polarization rotation control unit 3 to be converted into
Figure BDA0002427349400000064
The dynamic regulation and control process of the polarization state of the output light of the whole waveguide system is as follows:
for TE polarization state input, an incident light mode is divided into two paths with the same phase by a power beam splitter 1
Figure BDA0002427349400000065
If the relative phase difference of the two light waves under the influence of the phase modulation unit 2 is
Figure BDA0002427349400000066
The waveguides are merged and then converted into
Figure BDA0002427349400000067
Output after passing through a polarization rotation control unit 3
Figure BDA0002427349400000068
And
Figure BDA0002427349400000069
since the first-order mode cannot pass through the Y branchThe resultant beam combiner 4, so the final output light is still in the TE polarization state; if the relative phase difference of the two light waves under the influence of the phase modulation unit 2 is
Figure BDA00024273494000000610
The waveguides are merged and then converted into
Figure BDA00024273494000000611
Output after passing through a polarization rotation control unit 3
Figure BDA00024273494000000612
And
Figure BDA00024273494000000613
the final output light is in a TM polarization state after passing through the beam combiner 4;
for TM polarization state input, the incident light mode is divided into two paths with the same phase by the power beam splitter 1
Figure BDA00024273494000000614
If the relative phase difference of the two light waves under the influence of the phase modulation unit 2 is
Figure BDA00024273494000000615
The waveguides are merged and then converted into
Figure BDA00024273494000000616
Output after passing through a polarization rotation control unit 3
Figure BDA00024273494000000617
And
Figure BDA00024273494000000618
the first order mode will be filtered out by the beam combiner 4, so the final output light is still in the TM polarization state; if the relative phase difference of the two light waves under the influence of the phase modulation unit 2 is
Figure BDA00024273494000000619
The waveguides are merged and then converted into
Figure BDA00024273494000000620
Output after passing through a polarization rotation control unit 3
Figure BDA00024273494000000621
And
Figure BDA00024273494000000622
the final output light is in the TE polarization state after passing through the beam combiner 4.
Two polarization states of output light of the whole waveguide system and two relative phase differences of two arms of the MZI phase modulation unit (2)
Figure BDA00024273494000000623
And
Figure BDA00024273494000000624
there is a one-to-one correspondence between them.
Taking TM polarization state input as an example, the width of the material 302 with metal property is greater than 5 μm, the material of the material 302 with metal property is gold, the material of the dielectric waveguide 301 is silicon, the dielectric waveguide 301 and the material 302 with metal property are placed on the same plane, the width of the dielectric waveguide 301 is 240nm, the width of the groove is 180nm, and the length of the material 302 with metal property is about 5.7 μm, as shown in (a), (b), and (c) of fig. 3, the distance between the sidewall of the material 302 with metal property and the dielectric waveguide 301 and the thickness of the material 302 with metal property are selected to be Gap, hAuWhen the wavelength is near (60,30) nm, the TM transmittance is 90.46% (0.44dB), the TE transmittance is 80.66% (0.93dB), and the polarization dependent loss PDL<0.5dB and (d) is the corresponding metal length. The abundant mode corresponding relation enables the device to realize the function of active polarization rotation for incident light in two polarization states.
The above-mentioned embodiments are only intended to describe the preferred embodiments of the present invention, but not to limit the scope of the present invention, and those skilled in the art should also be able to make various modifications and improvements to the technical solution of the present invention without departing from the spirit of the present invention, and all such modifications and improvements are intended to fall within the scope of the present invention as defined in the appended claims.

Claims (3)

1. An active polarization rotator realized based on a hybrid surface plasmon slot waveguide is characterized in that: the polarization rotation control unit comprises a mixed surface plasma groove waveguide, the mixed surface plasma groove waveguide is provided with a certain groove width, two dielectric waveguides of the mixed surface plasma groove waveguide are both provided with a certain width, and a material with metal characteristics and a certain thickness, a certain length and a certain width is arranged on two sides of the mixed surface plasma groove waveguide at a certain interval.
2. The active polarization rotator implemented based on a hybrid surface plasmon slot waveguide of claim 1, wherein: the material with the metal characteristic is gold, aluminum, silver or zinc oxide.
3. The active polarization rotator implemented based on a hybrid surface plasmon slot waveguide of claim 1 or 2, characterized in that: the power beam splitter is a 50:50 power beam splitter.
CN202020407403.9U 2020-03-26 2020-03-26 Active polarization rotator realized based on mixed surface plasma groove waveguide Expired - Fee Related CN211669401U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202020407403.9U CN211669401U (en) 2020-03-26 2020-03-26 Active polarization rotator realized based on mixed surface plasma groove waveguide

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202020407403.9U CN211669401U (en) 2020-03-26 2020-03-26 Active polarization rotator realized based on mixed surface plasma groove waveguide

Publications (1)

Publication Number Publication Date
CN211669401U true CN211669401U (en) 2020-10-13

Family

ID=72742826

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202020407403.9U Expired - Fee Related CN211669401U (en) 2020-03-26 2020-03-26 Active polarization rotator realized based on mixed surface plasma groove waveguide

Country Status (1)

Country Link
CN (1) CN211669401U (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111239896A (en) * 2020-03-26 2020-06-05 北京爱杰光电科技有限公司 Active polarization rotator realized based on mixed surface plasma groove waveguide

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111239896A (en) * 2020-03-26 2020-06-05 北京爱杰光电科技有限公司 Active polarization rotator realized based on mixed surface plasma groove waveguide

Similar Documents

Publication Publication Date Title
US9335472B2 (en) Planar optical waveguide device and DP-QPSK modulator
WO2015096070A1 (en) Waveguide polarization splitter and polarization rotator
CN106094107B (en) Polarization beam splitter
CN105044931A (en) Silicon-based integrated differential electrooptical modulator and preparation method for same
CN105866885B (en) Polarization beam splitting rotator
CN114721176B (en) Polarization controller based on-chip mode conversion
Danaie et al. Design of a photonic crystal differential phase comparator for a Mach–Zehnder switch
CN114815324B (en) Polarization regulation and control device based on silicon-based phase-change material
Hao et al. Efficient TE-polarized mode-order converter based on high-index-contrast polygonal slot in a silicon-on-insulator waveguide
CN211669401U (en) Active polarization rotator realized based on mixed surface plasma groove waveguide
Sanchez et al. Low-power operation in a silicon switch based on an asymmetric Mach–Zehnder interferometer
CN102124395A (en) Surface-plasmon-based optical modulator
CN111239896A (en) Active polarization rotator realized based on mixed surface plasma groove waveguide
CN116520493A (en) TE mode and TM mode separated polarization beam splitter chip based on film lithium niobate
Li et al. Si racetrack modulator with III-V/Si hybrid MOS optical phase shifter
CN114545553B (en) Optical topology duplexer based on coupling topology waveguide
CN112415663B (en) Mach-Zehnder broadband low-power-consumption optical switch based on multi-stage microdisk coupling
Shu et al. Efficient graphene phase modulator based on a polarization multiplexing optical circuit
CN114994959A (en) Electro-optical modulator
Goi et al. Silicon Mach-Zehnder modulator using low-loss phase shifter with bottom PN junction formed by restricted-depth doping
CN108627919B (en) Polarization insensitive silicon-based optical switch
GB2602757A (en) High-density integrated optical waveguide
CN112327517A (en) Narrow bandwidth Mach-Zehnder interferometer and spectrum shaping device and method
CN115291333B (en) Reconfigurable silicon-based multimode micro-ring resonator
Duy Tien et al. Zero-chirp and low power PAM-4 modulation based on SOI cascaded multimode interference structures

Legal Events

Date Code Title Description
GR01 Patent grant
GR01 Patent grant
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20201013

CF01 Termination of patent right due to non-payment of annual fee