CN110749956B - Reconfigurable optical mode converter compatible with wavelength division multiplexing - Google Patents
Reconfigurable optical mode converter compatible with wavelength division multiplexing Download PDFInfo
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Abstract
The invention provides a reconfigurable optical mode converter compatible with wavelength division multiplexing, which comprises a multi-ring cascade part and a mode converter, wherein the multi-ring cascade part and the mode converter are connected; the multi-ring cascade part consists of a straight waveguide, a passive micro-ring and n-1 adjustable micro-ring resonators, wherein n is a positive integer greater than or equal to 2. The optical mode converter applies multi-ring cascade to the mode converter, light in an active micro-ring is equally divided into x parts by changing the resonance state of each tunable micro-ring resonator, the light is downloaded into a corresponding waveguide through the resonant micro-ring resonators, and conversion of a basic mode to any multiple high-order modes can be achieved through the mode converter, namely multiple modes are generated simultaneously, so that the problem that the number of lasers needed in an optical communication system is too large is solved. The invention has good expandability and can be combined with wavelength division multiplexing, thereby improving the flexibility of the optical communication system.
Description
Technical Field
The invention belongs to the technical field of optical mode multiplexing, and relates to a reconfigurable optical mode converter compatible with wavelength division multiplexing.
Background
With the advent of the big data age, the demands for the processing speed and processing capacity of information have been further increased. Researchers have improved the information transmission capability of optical networks by applying advanced multiplexing techniques of light to high-speed optical communication systems. The most mature multiplexing technology is wavelength division multiplexing, and as the data communication capacity increases, the number of laser sources required for wavelength division technology increases proportionally, which increases the cost of the optical communication system. For this reason, researchers have introduced optical mode multiplexing techniques into optical transmission. The mode of light is a dimension other than the wavelength and polarization of light, and the modes of different lights are independent of each other when propagating in a waveguide or an optical fiber. Therefore, transmission signals can be carried in different modes with the same wavelength, data transmission is carried out by utilizing the orthogonality of the modes, and different optical modes are demultiplexed to different ports through a mode demultiplexer at a receiving end. Thus, it is possible to replace more wavelengths required with different modes of one wavelength by the optical mode multiplexing technique, thereby greatly reducing the number of on-chip laser sources and simultaneously improving the information processing capability in the optical communication system.
The prior optical mode converter and mode multiplexer generally convert one mode into another specific mode, and in 2014, the article "WDM-compatible mode-division multiplexing on a silicon chip" (natural Communications, vol. 5, pp. 3069) was published by l.w. Luo et al in the well-known journal Nature Communications. Mode multiplexers based on microrings were first proposed, and since then research on modes has received increasing attention from researchers. In 2019, X.Han et al published a scientific and technical paper "configurable On-Chip Mode Exchange for Mode-Division Multiplexing Optical Networks" (Journal of light Technology, Vol.37, Issue 3, pp. 1008-1013) in Journal of light Technology, and proposed a Mode selection switch between a base Mode and a higher-order Mode based On a micro-ring Mode converter. These devices cannot simultaneously convert one mode into multiple modes, i.e., cannot simultaneously generate multiple modes. For wavelength division multiplexing, different wavelengths can be input into the same waveguide or fiber at the same time. The device cannot generate a plurality of modes at the same time, cannot process the required modes in parallel, greatly reduces the information processing capacity of the optical communication system, and cannot meet the requirements of the increasingly huge optical communication system.
Disclosure of Invention
The invention aims to provide a reconfigurable optical mode converter compatible with wavelength division multiplexing, which can realize mode conversion from a basic mode to any multiple high-order modes at the same time, and reduce the number of laser sources in an optical communication system by using mode division multiplexing, thereby reducing the power consumption of the optical communication system.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows: a wavelength division multiplexing compatible reconfigurable optical mode converter includes a connected multi-ring cascade and a mode converter; the multi-ring cascade part consists of a straight waveguide, a passive micro-ring and n adjustable micro-ring resonators.
The optical mode converter of the invention applies a cascade micro-ring to the mode converter on the basis of the mode conversion principle in the prior art, a passive micro-ring R1 in the optical mode converter is cascaded with a micro-ring R2, a micro-ring R3, a micro-ring R4 and the like, and the resonance state of active micro-rings such as R2, R3, R4 and the like is changed by adjusting the effective refractive index of the active micro-rings such as the micro-ring R2, the micro-ring R3, the micro-ring R4 and the like, thereby realizing the conversion of a basic mode to any multiple high-order modes at the same time. The optical mode converter can be well combined with mature CMOS (complementary metal oxide semiconductor) process technology, the device has good expansibility, can be combined with wavelength division multiplexing technology, improves the flexibility of an optical network, and plays an important role in increasingly flexible optical communication systems.
Drawings
Fig. 1 is a schematic diagram of an optical mode converter of the present invention.
Fig. 2 is a schematic diagram of a multiple ring cascade in an embodiment of an optical mode converter of the present invention.
Fig. 3 is a schematic diagram of a mode conversion structure in an embodiment of an optical mode converter of the present invention.
Fig. 4 is an output spectrum of the optical mode converter of the present invention for converting the fundamental mode into any one of the higher order modes.
Fig. 5 is an output spectrum of the optical mode converter of the present invention for converting the fundamental mode into any two higher order modes.
Fig. 6 is an output spectrum of the optical mode converter of the present invention for conversion of the fundamental mode to any of three higher order modes.
Fig. 7 is a schematic cross-sectional structure diagram of a silicon-based thermo-optically modulated micro-ring resonator or straight waveguide.
Fig. 8 is a schematic cross-sectional structure diagram of a silicon-based electro-optically modulated micro-ring resonator or straight waveguide.
Fig. 9 is a graph of the spectral response of a microring resonator, using silicon-based thermo-optic modulation as an example.
In the figure: 1. the waveguide coupler comprises a multi-ring cascade piece, 2, a mode converter, 2-1, a first straight waveguide, 2-2, a first bent waveguide, 2-3, a second straight waveguide, 2-4, a second bent waveguide, 2-5, a third bent waveguide, 2-6, a third straight waveguide, 2-7, a fourth bent waveguide, 2-8, a fifth bent waveguide, 2-9, a fourth straight waveguide, 2-10, a sixth bent waveguide, 2-11, a seventh bent waveguide, 2-12, a fifth straight waveguide, 2-13, an eighth bent waveguide, 2-14, a sixth straight waveguide, 2-15, a seventh straight waveguide and 2-16, an eighth straight waveguide;
1-1, ninth straight waveguide, 1-2, tenth straight waveguide, 1-3, ninth curved waveguide, 1-4, eleventh straight waveguide, 1-5, tenth curved waveguide, 1-6, twelfth straight waveguide, 1-7, eleventh curved waveguide, 1-8, thirteenth straight waveguide, 1-9, fourteenth straight waveguide, 1-10, twelfth curved waveguide, 1-11, fifteenth straight waveguide, 1-12, sixteenth straight waveguide, 1-13, thirteenth curved waveguide, 1-14, seventeenth straight waveguide, 1-15, eighteenth straight waveguide.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, the reconfigurable optical mode converter of the present invention includes a multi-loop cascade 1 and a mode converter 2 connected together; the multi-ring cascade component 1 is composed of a straight waveguide, a passive micro-ring and n adjustable micro-ring resonators.
The mode converter 2 in the reconfigurable optical mode converter comprises a plurality of straight waveguides for the mode converter, wherein the straight waveguides are sequentially arranged, adjacent mode converters are connected through a heat insulation cone by the straight waveguides, and the widths of the straight waveguides for the mode converters are sequentially decreased; a straight waveguide for the mode converter is coupled with a bent structure waveguide, the bent structure waveguide consists of a straight waveguide for the bent structure waveguide and two bent waveguides for the bent structure waveguide, the two bent waveguides are connected with the straight waveguide for the bent structure waveguide through the bent structure waveguide, and the straight waveguide for the bent structure waveguide is arranged in parallel with the coupled straight waveguide for the mode converter; the other ends of the bent waveguides for the bent structure waveguides facing the straight waveguide with the smallest width in the straight waveguides for the mode converter in the same bent structure waveguide are connected with the multi-ring cascade part 1. The widths of the straight waveguide for the curved-structure waveguide and the curved waveguide for the curved-structure waveguide in all the curved-structure waveguides are the same.
FIG. 2 is a schematic diagram of a mode converter 2 in an embodiment of the reconfigurable optical mode converter of the present invention, which includes a first straight waveguide 2-1, an eighth straight waveguide 2-16, a seventh straight waveguide 2-15, and a sixth straight waveguide 2-14, which are arranged in sequence, where the first straight waveguide 2-1 is connected to the eighth straight waveguide 2-16 through a first adiabatic taper, the eighth straight waveguide 2-16 is connected to the seventh straight waveguide 2-15 through a second adiabatic taper, and the seventh straight waveguide 2-15 is connected to the sixth straight waveguide 2-14 through a third adiabatic taper; the width of the first straight waveguide 2-1 is smaller than that of the eighth straight waveguide 2-16, the width of the eighth straight waveguide 2-16 is smaller than that of the seventh straight waveguide 2-15, and the width of the seventh straight waveguide 2-15 is smaller than that of the sixth straight waveguide 2-14;
the mode converter 2 shown in fig. 2 further comprises a second straight waveguide 2-3, a third straight waveguide 2-6, a fourth straight waveguide 2-9 and a fifth straight waveguide 2-12, the second straight waveguide 2-3 being parallel to and coupled to the first straight waveguide 2-1, the third straight waveguide 2-6 being parallel to and coupled to the eighth straight waveguide 2-16, the fourth straight waveguide 2-9 being parallel to and coupled to the seventh straight waveguide 2-15, the fifth straight waveguide 2-12 being parallel to and coupled to the sixth straight waveguide 2-14; two ends of the second straight waveguide 2-3 are respectively connected with a first bent waveguide 2-2 and a second bent waveguide 2-4, two ends of the third straight waveguide 2-6 are respectively connected with a third bent waveguide 2-5 and a fourth bent waveguide 2-7, two ends of the fourth straight waveguide 2-9 are respectively connected with a fifth bent waveguide 2-8 and a sixth bent waveguide 2-10, and two ends of the fifth straight waveguide 2-12 are respectively connected with a seventh bent waveguide 2-11 and an eighth bent waveguide 2-13;
the first curved waveguide 2-2, the third curved waveguide 2-5, the fifth curved waveguide 2-8 and the seventh curved waveguide 2-11 all face the first straight waveguide 2-1, and the other end of the first curved waveguide 2-2, the other end of the third curved waveguide 2-5, the other end of the fifth curved waveguide 2-8 and the other end of the seventh curved waveguide 2-11 are all connected with the multi-ring cascade 1 shown in fig. 3.
The width of the first curved waveguide 2-2, the width of the second straight waveguide 2-3, the width of the second curved waveguide 2-4, the width of the third curved waveguide 2-5, the width of the third straight waveguide 2-6, the width of the fourth curved waveguide 2-7, the width of the fifth curved waveguide 2-8, the width of the fourth straight waveguide 2-9, the width of the sixth curved waveguide 2-10, the width of the seventh curved waveguide 2-11, the width of the fifth straight waveguide 2-12 and the width of the eighth curved waveguide 2-13 are the same.
The invention discloses a multi-ring cascade part 1 in a reconfigurable optical mode converter, which comprises a ring structure consisting of a ninth straight waveguide 1-1 and n adjustable micro-ring resonators, wherein all devices forming the ring structure are not in contact with each other, the n adjustable micro-ring resonators are a micro-ring resonator R2, a micro-ring resonator R3, micro-ring resonators R4 and … … and a micro-ring resonator Rn which are sequentially arranged, and the adjustable micro-ring resonators are active micro-rings; a micro-ring resonator R1 is arranged in the annular structure, and a micro-ring resonator R1 is a passive micro-ring; the number of active microrings is the same as the number of curved structure waveguides in the mode converter 2. The radii of all active microrings are the same and smaller than the radius of the passive microring.
Each active microring is coupled with a straight waveguide for a multi-ring cascade, the active microring is positioned between the straight waveguide for the multi-ring cascade coupled with the active microring and the microring resonator R1, all the straight waveguides for the multi-ring cascade coupled with the active microring are not intersected, and one straight waveguide for the multi-ring cascade coupled with the active microring is connected with one bent structure waveguide in the mode converter 2 through one connecting waveguide, namely the one straight waveguide for the multi-ring cascade coupled with the active microring is connected with the other end of the bent structure waveguide for the bent structure waveguide facing the straight waveguide with the minimum width in the straight waveguides for the mode converter in one bent structure waveguide of the mode converter 2 through one connecting waveguide.
The structure of the connecting waveguide is determined according to the distance between the straight waveguide for the multi-ring cascade part coupled with the active micro-ring and the bent structure waveguide in the mode converter 2 to be connected with the straight waveguide, the connecting waveguide can be formed by sequentially arranging and connecting two bent waveguides and two straight waveguides at intervals, a bent waveguide is connected with two straight waveguides, or a straight waveguide, and all the connecting waveguides do not intersect.
Fig. 3 is a multi-ring cascade 1 in an embodiment of the reconfigurable optical mode converter of the present invention, including a ring structure composed of a ninth straight waveguide 1-1, a micro-ring resonator R2, a micro-ring resonator R3, a micro-ring resonator R4, and a micro-ring resonator R5, where the ninth straight waveguide 1-1, the micro-ring resonator R2, the micro-ring resonator R3, the micro-ring resonator R4, and the micro-ring resonator R5 are not in contact with each other, the micro-ring resonator R1 is disposed in the ring structure, the micro-ring resonator R1 is a passive micro-ring, and the micro-ring resonator R2, the micro-ring resonator R3, the micro-ring resonator R4, and the micro-ring resonator R5 are active micro-rings; the radius of the microring resonator R2, the radius of the microring resonator R3, the radius of the microring resonator R4 and the radius of the microring resonator R5 are the same and smaller than the radius of the microring resonator R1.
The micro-ring resonator R2 is coupled with a vertically arranged tenth straight waveguide 1-2, the upper end of the tenth straight waveguide 1-2 is connected with one end of an eleventh straight waveguide 1-4 through a ninth curved waveguide 1-3, the other end of the eleventh straight waveguide 1-4 is connected with the upper end of a twelfth straight waveguide 1-6 through a tenth curved waveguide 1-5, and the lower end of the twelfth straight waveguide 1-6 is connected with the other end of the first curved waveguide 2-2; here, the ninth curved waveguide 1-3, the eleventh straight waveguide 1-4, the tenth curved waveguide 1-5 and the twelfth straight waveguide 1-6 connected in this order constitute a connecting waveguide.
The micro-ring resonator R3 is coupled with a fifteenth vertical waveguide 1-11, the upper end of the fifteenth vertical waveguide 1-11 is connected with one end of a fourteenth vertical waveguide 1-9 through a twelfth curved waveguide 1-10, the other end of the fourteenth vertical waveguide 1-9 is connected with the upper end of a thirteenth vertical waveguide 1-8 through an eleventh curved waveguide 1-7, and the lower end of the thirteenth vertical waveguide 1-8 is connected with the other end of a third curved waveguide 2-5; here, the twelfth curved waveguide 1-10, the fourteenth straight waveguide 1-9, the thirteenth straight waveguide 1-8 and the eleventh curved waveguide 1-7 connected in this order constitute a connecting waveguide.
The micro-ring resonator R4 is coupled with a seventeenth straight waveguide 1-14 which is horizontally arranged, one end of the seventeenth straight waveguide 1-14 is connected with the upper end of a sixteenth straight waveguide 1-12 through a thirteenth curved waveguide 1-13, and the lower end of the sixteenth straight waveguide 1-12 is connected with the other end of a fifth curved waveguide 2-8; here, the thirteenth curved waveguide 1 to 13 and the sixteenth straight waveguide 1 to 12 connected constitute a connecting waveguide.
The micro-ring resonator R5 is coupled with eighteenth vertical straight waveguides 1-15, and the lower ends of the eighteenth straight waveguides 1-15 are connected with the other ends of the seventh curved waveguides 2-11. Here, the eighteenth straight waveguides 1 to 15 are connection waveguides.
The width of all waveguides (including straight and curved waveguides) in fig. 3 is the same.
The resonance wavelength of the microring resonator is changed by changing the effective refractive index of the microring resonator.
The straight waveguides with different widths in the mode converter 2 in the reconfigurable optical mode converter are connected through the adiabatic taper with enough length to form an output waveguide, wherein the width change of the adiabatic taper is linearly and slowly changed from the narrower waveguide width to the wider waveguide width, so that the mode conversion of the optical signal with a lower order mode is not generated when the optical signal is transmitted in the adiabatic taper. Since the effective refractive index of different mode transmissions is related to the width of the waveguide and the order of the mode, the effective refractive index of the converted mode must be the same to realize mode conversion, and mode conversion can be realized by changing the waveguide width at the different mode conversion positions.
For example, the mode of light input to the ninth straight waveguide 1-1 is the fundamental mode TE0And light corresponding to the resonance wavelength lambda of the micro-ring resonator R1 in the input light is coupled into the micro-ring resonator R1 through the coupling region. The micro-ring resonator R1 is cascaded with a plurality of micro-ring resonators R2, R3, R4, … … and Rn with the radius smaller than that of the micro-ring resonator R1, the waveguide temperatures of the micro-ring resonators R2, R3, R4, … … and Rn are changed by changing the voltage applied to the micro-ring resonator with the smaller radius, so that the effective refractive indexes of the micro-ring resonators R2, R3, R4, … … and Rn are changed, and accordingly, the tuning effect on the micro-ring resonators R2, R3, R4, … … and Rn is achieved. If the light with the wavelength of lambda is downloaded to the output waveguide of the micro-ring resonator R2, the resonant wavelength of the micro-ring resonator R2 can be adjusted to lambda, and the resonant wavelength of any one or more resonators such as R3 and R4 can be adjusted in the same wayThe light having the wavelength λ is output from the desired output waveguide after being averaged out. If the input wavelength is changed to be lambda 1, the number of the resonance micro-rings is correspondingly increased, and the simultaneous conversion of a plurality of modes in two wavelengths of lambda and lambda 1 can be simultaneously realized. And so on, the reconfigurable optical mode converter of the invention has the function of compatible wavelength division multiplexing.
Fig. 4 is a spectrum diagram of a download end obtained when any one of the micro-ring resonators R2, R3, R4, …, and Rn resonates, where the ordinate is the intensity of the download end light and the abscissa is the wavelength. When only one of the microring resonators R2, R3, R4, … Rn resonates, the light coupled into the microring resonator R1 from the input waveguide will be directly downloaded into the corresponding waveguide through the resonating microring resonator and into the mode converter. Since the effective refractive index of the fundamental mode in the fundamental mode waveguide is the same as the effective refractive index of the desired converted mode propagating in the waveguide width of its conversion region, the fundamental mode in the fundamental mode waveguide will be converted to the corresponding mode.
As shown in fig. 5, the graph is a spectrum of the download end obtained when any two micro-ring resonators of the micro-rings R2, R3, R4, and … Rn resonate, the ordinate is the intensity of the download end light, and the abscissa is the wavelength. The two curves in fig. 5 are substantially coincident, and have a slight difference in height at the top due to a slight difference in coupling conditions of each microring resonator. When two microring resonator resonances exist in R2, R3, R4, … and Rn in the curves, the light coupled into the microring resonator R1 from the input waveguide will be divided equally into two parts, respectively downloaded into the corresponding waveguides through the microring resonators in the resonant state, and converted into the corresponding modes through the mode converter 2, and the converted modes can be transmitted in the multimode waveguide at the same time.
Fig. 6 is a spectrum diagram of a download end obtained when any three micro-ring resonators among the micro-rings R2, R3, R4, and … Rn resonate, and the ordinate is the intensity of the download end light and the abscissa is the wavelength. The three curves in fig. 6 are substantially coincident, and have a slight difference in height at the top due to a slight difference in coupling conditions of each micro-ring resonator. When three micro-ring resonators in R2, R3, R4, … and Rn resonate, light coupled into the micro-ring resonator R1 from an input waveguide is equally divided into three parts, the three parts are respectively downloaded into corresponding waveguides through the resonant micro-rings, and then are converted into corresponding modes through the mode converter 2, and the converted modes can be simultaneously transmitted in a multi-mode waveguide.
The device is based on SOI material, and the waveguide core layer Si (refractive index of 3.45) made of the SOI material and the substrate SiO2The larger refractive index difference (refractive index of 1.44) has strong capability of limiting the light field, so that the device size is smaller and the radius of the micro-ring resonator can be smaller. Meanwhile, the reconfigurable optical mode converter can also be realized by adopting materials such as SIN, III-V family and the like.
The resonant frequency of the micro-ring resonator in the reconfigurable optical mode converter can be tuned based on the thermo-optical effect and can also be tuned by the plasma dispersion effect. FIG. 7 is a cross-sectional view of a silicon-based thermo-optically modulated micro-ring resonator or straight waveguide with Si as the substrate and a layer of SiO on the substrate2Material in SiO2The waveguide core layer (Si material) and the tuning electrode are arranged on the layer, and SiO is arranged around the waveguide core layer and the tuning electrode2The material is surrounded. The width of the waveguide core layer is W, the height of the waveguide core layer is H, and the distance between the top of the core region and the bottom of the tuning electrode is dSiO2. Fig. 8 is a cross-sectional view of a silicon-based electro-optical modulated micro-ring resonator or a straight waveguide, and the electro-optical modulation structure has high modulation efficiency and high modulation speed. The injection and extraction of carriers in the waveguide can be changed by the applied voltage, so that the effective refractive index of the waveguide is changed. When a forward bias is applied, carriers are injected into the waveguide SI from the P region and the N region, and when a reverse bias is applied, electrons and holes in the waveguide SI are extracted.
FIG. 9 is a graph of the spectral response of a thermo-optically modulated microring resonator having a resonant wavelength at λ 1 when no voltage is applied, where only light having a wavelength of λ 1 can be downloaded by the microring resonator, as in FIG. 9 a; when a proper voltage is applied, the resonance wavelength of the microring resonator will shift to λ 2 due to thermo-optic effect, and only light with wavelength λ 2 can be downloaded by the microring resonator, as shown in fig. 9 b.
The optical mode converter of the invention applies multi-ring cascade to the mode converter, and equally divides the light in the passive micro-ring into x parts by changing the resonance state of each tunable micro-ring resonator (active micro-ring), and downloads the light into the corresponding waveguide through x resonant active micro-ring resonators. The invention has good expandability, can be combined with wavelength division multiplexing, and improves the flexibility of an optical communication system.
Claims (4)
1. A reconfigurable optical mode converter compatible with wavelength division multiplexing, comprising a multi-ring cascade (1) and a mode converter (2) connected together; the multi-ring cascade part (1) is composed of a straight waveguide, a passive micro-ring and n adjustable micro-ring resonators, the passive micro-ring in the optical mode converter is cascaded with n active adjustable micro-rings, and the resonance state of the active micro-ring is changed by adjusting the effective refractive index of the active micro-ring; and n is more than or equal to 2.
2. The reconfigurable optical mode converter compatible with wavelength division multiplexing according to claim 1, wherein the mode converter (2) comprises a plurality of mode converter straight waveguides arranged in sequence, adjacent mode converters are connected by adiabatic tapers with the straight waveguides, and the widths of the plurality of mode converter straight waveguides decrease in sequence; a straight waveguide for the mode converter is coupled with a bent structure waveguide, the bent structure waveguide consists of a straight waveguide for the bent structure waveguide and two bent waveguides for the bent structure waveguide, the two bent waveguides are connected with the straight waveguide for the bent structure waveguide through the bent structure waveguide, and the straight waveguide for the bent structure waveguide is arranged in parallel with the coupled straight waveguide for the mode converter; the other end of the bent waveguide for the bent structure waveguide facing the straight waveguide with the minimum width in the straight waveguides for the mode converter in the same bent structure waveguide is connected with the multi-ring cascade part (1); the widths of the straight waveguide for the curved-structure waveguide and the curved waveguide for the curved-structure waveguide in all the curved-structure waveguides are the same.
3. The reconfigurable optical mode converter compatible with wavelength division multiplexing according to claim 2, wherein the multi-ring cascade element (1) comprises a ring structure formed by a ninth straight waveguide (1-1) and n tunable micro-ring resonators, the devices forming the ring structure are not in contact, a micro-ring resonator R1 is arranged in the ring structure, and the micro-ring resonator R1 is a passive micro-ring; the number of the active micro-rings is the same as that of the bending structure waveguides in the mode converter (2); the radiuses of all the active micro-rings are the same and smaller than the radius of the passive micro-ring;
each active micro-ring is coupled with a straight waveguide for the multi-ring cascade part, the active micro-ring is positioned between the straight waveguide for the multi-ring cascade part coupled with the active micro-ring and the micro-ring resonator R1, all the straight waveguides for the multi-ring cascade part coupled with the active micro-ring are not intersected, and the straight waveguide for the multi-ring cascade part coupled with the active micro-ring is connected with the other end of the bent waveguide for the bent waveguide facing the straight waveguide with the minimum width in the straight waveguide for the mode converter in the bent waveguide for the mode converter (2) through a connecting waveguide; all connecting waveguides do not intersect.
4. The wavelength division multiplexing compatible reconfigurable optical mode converter of claim 3, wherein the connecting waveguides are formed by sequentially connecting two bent waveguides and two straight waveguides at intervals; or, a bent waveguide is connected with two straight waveguides; or, a straight waveguide.
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| CN106463908A (en) * | 2014-04-16 | 2017-02-22 | 阿尔卡特朗讯 | Tunable emitting device with a directly modulated laser coupled to a ring resonator |
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