On-chip multidimensional multiplexing has shown considerable potential for enhancing transmission capacity and developing communication networks in integrated optical systems.Micro-ring resonators,which utilize the wa...On-chip multidimensional multiplexing has shown considerable potential for enhancing transmission capacity and developing communication networks in integrated optical systems.Micro-ring resonators,which utilize the wavelength-dependent whispering gallery resonance mechanism and feature customizable cavity lengths,offer inherent advantages for accurate wavelength filtering.These characteristics make them promising candidates for wavelength multiplexers.However,a significant challenge arises from the mismatch in the effective refractive index between orthogonal linear polarizations,which introduces complexities to polarization channel multiplexing and impedes progress in on-chip multidimensional multiplexing that integrates both wavelength and polarization channels.In this work,we propose a double-layer adiabatic structureconnected micro-ring resonator(AMRR)with vertical refractive index asymmetry,demonstrating its utility in multidimensional(de)multiplexers.Our approach enables polarization division multiplexing(PDM)by facilitating polarization rotation between transverse electric and transverse magnetic polarizations through polarization hybridization.The(de)multiplexing of both wavelength and polarization channels is achieved by controlling the incident light direction and filtering the resonance wavelength within the micro-ring resonator.As a proof of concept,we successfully transmitted 144 Gbit/s QPSK-OFDM signals and achieved bit error rates below the forward error correction threshold at-19 d Bm using the proposed multidimensional(de)multiplexer,which accommodates 3 wavelengths and 2 polarizations.Our design,which leverages the AMRR for simultaneous(de)multiplexing of wavelength and polarization channels,not only overcomes the limitation of traditional micro-ring resonators in implementing PDM,but also reduces the footprint of the multidimensional(de)multiplexer to 27μm×219μm,an order of magnitude smaller compared to conventional designs.展开更多
The advancement of integrated optical communication networks necessitates the deployment of on-chip beam splitters for efficient signal interconnections at network nodes.However,the pursuit of micron-scale beam splitt...The advancement of integrated optical communication networks necessitates the deployment of on-chip beam splitters for efficient signal interconnections at network nodes.However,the pursuit of micron-scale beam splitting with large corners and reducing the device footprint to boost connection flexibility often results in phase mismatches.These mismatches,which stem from radiation modes and backward scattering,pose significant obstacles in creating highly integrated and interference-resistant connections.To address this,we introduce a solution based on the topological valley-contrasting state generated by photonic crystals with opposing valley Chern numbers,manifested in a harpoon-shaped structure designed to steer the splitting channels.This approach enables adiabatic mode field evolution over large corners,capitalizing on the robust phase modulation capabilities and topological protection provided by the subwavelength-scale valley-contrasting state.Our demonstration reveals that beam splitters with large corners of 60°,90°,and 120°exhibit insertion loss fluctuations below 2.7 dB while maintaining a minimal footprint of 8.8μm×8.8μm.As a practical demonstration,these devices facilitate three-channel signal connections,successfully transmitting quadrature phase shift keying signals at 3.66 Tbit/s with bit error rates below the forward error correction threshold,demonstrating performance comparable to that in defects scenarios.By harnessing the unidirectional excitation feature,we anticipate significant enhancements in the capabilities of signal distribution and connection networks through a daisy chain configuration.展开更多
基金supported by the National Natural Science Foundation of China(Grant Nos.62271322,62331004,and 62222501)Guangdong Basic and Applied Basic Research Foundation(Grant No.2023A1515030152)+5 种基金the Science and Technology Project of Shenzhen(Grant No.ZDSYS201707271014468)Shenzhen Science and Technology Program(Grant No.JCYJ20240813143018024)the Natural Science Foundation of Top Talent of SZTU(Grant No.GDRC202204)Qianxinan Prefecture Science and Technology Plan Project(Grant No.2023123)the Scientific Research Fund Project of Minzu Normal University of Xingyi(Grant No.23XYZD07)Guizhou Province Youth Science and Technology Talent Development Project(Qian Jiaoji[2024]No.244)。
文摘On-chip multidimensional multiplexing has shown considerable potential for enhancing transmission capacity and developing communication networks in integrated optical systems.Micro-ring resonators,which utilize the wavelength-dependent whispering gallery resonance mechanism and feature customizable cavity lengths,offer inherent advantages for accurate wavelength filtering.These characteristics make them promising candidates for wavelength multiplexers.However,a significant challenge arises from the mismatch in the effective refractive index between orthogonal linear polarizations,which introduces complexities to polarization channel multiplexing and impedes progress in on-chip multidimensional multiplexing that integrates both wavelength and polarization channels.In this work,we propose a double-layer adiabatic structureconnected micro-ring resonator(AMRR)with vertical refractive index asymmetry,demonstrating its utility in multidimensional(de)multiplexers.Our approach enables polarization division multiplexing(PDM)by facilitating polarization rotation between transverse electric and transverse magnetic polarizations through polarization hybridization.The(de)multiplexing of both wavelength and polarization channels is achieved by controlling the incident light direction and filtering the resonance wavelength within the micro-ring resonator.As a proof of concept,we successfully transmitted 144 Gbit/s QPSK-OFDM signals and achieved bit error rates below the forward error correction threshold at-19 d Bm using the proposed multidimensional(de)multiplexer,which accommodates 3 wavelengths and 2 polarizations.Our design,which leverages the AMRR for simultaneous(de)multiplexing of wavelength and polarization channels,not only overcomes the limitation of traditional micro-ring resonators in implementing PDM,but also reduces the footprint of the multidimensional(de)multiplexer to 27μm×219μm,an order of magnitude smaller compared to conventional designs.
基金supported by the National Natural Science Foundation of China(Grant No.62271322)Guangdong Basic and Applied Basic Research Foundation(Grant No.2023A1515030152)+3 种基金Shenzhen Science and Technology Program(Grant No.JCYJ20210324095610027)Natural Science Foundation of Top Talent of SZTU(Grant No.GDRC202204)Qianxinan Prefecture Science and Technology Plan Project(Grant No.2023123)Scientific Research Fund Project of Minzu Normal University of Xingyi(Grant No.23XYZD07)。
文摘The advancement of integrated optical communication networks necessitates the deployment of on-chip beam splitters for efficient signal interconnections at network nodes.However,the pursuit of micron-scale beam splitting with large corners and reducing the device footprint to boost connection flexibility often results in phase mismatches.These mismatches,which stem from radiation modes and backward scattering,pose significant obstacles in creating highly integrated and interference-resistant connections.To address this,we introduce a solution based on the topological valley-contrasting state generated by photonic crystals with opposing valley Chern numbers,manifested in a harpoon-shaped structure designed to steer the splitting channels.This approach enables adiabatic mode field evolution over large corners,capitalizing on the robust phase modulation capabilities and topological protection provided by the subwavelength-scale valley-contrasting state.Our demonstration reveals that beam splitters with large corners of 60°,90°,and 120°exhibit insertion loss fluctuations below 2.7 dB while maintaining a minimal footprint of 8.8μm×8.8μm.As a practical demonstration,these devices facilitate three-channel signal connections,successfully transmitting quadrature phase shift keying signals at 3.66 Tbit/s with bit error rates below the forward error correction threshold,demonstrating performance comparable to that in defects scenarios.By harnessing the unidirectional excitation feature,we anticipate significant enhancements in the capabilities of signal distribution and connection networks through a daisy chain configuration.
