While machine learning holds remarkable potential for designing high-quality(Q)photonic crystal(PC)cavities,its effectiveness heavily relies on the availability of thousands of data samples.This requirement necessitat...While machine learning holds remarkable potential for designing high-quality(Q)photonic crystal(PC)cavities,its effectiveness heavily relies on the availability of thousands of data samples.This requirement necessitates substantial simulation resources and considerable time.To tackle the challenge of data scarcity in high-Q microcavity designs,we propose an innovative intelligent model for efficient data augmentation that entails merely a few hundred original samples.Notably,our novel structural reshaping strategy,involving the groundbreaking Euler-bend air-hole structure,significantly enhances the fabrication robustness,addressing the consistency difficulty associated with large-scale manufacturing of high-Q PC microcavity arrays.Silicon PC nanobeam cavities are experimentally demonstrated,featuring record-breaking loaded Q factors,large tolerance for the Euler-bend holes and extremely compact sizes of 6μm^(2).Importantly,to emphasize the on-chip high-resolution signal processing,the cavity-based microwave photonic filters(MPFs)offer unprecedented capabilities,including ultra-narrow bandwidths,an unlimited frequency tuning range and ultra-high rejection ratios using a micrometer-scale cavity.This breakthrough truly transcends the traditional limitations between the filter size,frequency resolution and tuning range.These exceptional characteristics position our MPFs with a cavity-based recordbreaking Q_(MPF)/S ratio(S:device size).展开更多
A multimode silicon photonic integrated circuit(PIC) comprising a pair of on-chip mode(de)multiplexers with 10-mode channels and a multimode bus waveguide with sharp bends is demonstrated to enable multi-channel on-ch...A multimode silicon photonic integrated circuit(PIC) comprising a pair of on-chip mode(de)multiplexers with 10-mode channels and a multimode bus waveguide with sharp bends is demonstrated to enable multi-channel on-chip transmissions. The core width of the multimode bus waveguide is chosen such that it can support 10 guided modes, of which there are four transverse-magnetic polarization modes and six transverse-electric polarization modes. This multimode bus waveguide comprises sharp bends based on modified Euler curves. Experimental results demonstrate that the present silicon PIC enables the 10-channel on-chip transmission with a low inter-mode crosstalk of approximately-20 dB over a broad bandwidth of 1520–1610 nm even when the bending radius of the S-bend is as small as 40 μm. Compared with a silicon PIC using a conventional arc-bend with the same bending radius, our proposed PIC demonstrates a significant improvement.展开更多
基金supported by the National Natural Science Foundation of China(Grant No.62175220)Open Research Fund of State Key Laboratory of Materials for Integrated Circuits(Grant No.SKLJC-K2025-07)the Fundamental Research Funds for the Central Universities(Grant No.G1323525012).
文摘While machine learning holds remarkable potential for designing high-quality(Q)photonic crystal(PC)cavities,its effectiveness heavily relies on the availability of thousands of data samples.This requirement necessitates substantial simulation resources and considerable time.To tackle the challenge of data scarcity in high-Q microcavity designs,we propose an innovative intelligent model for efficient data augmentation that entails merely a few hundred original samples.Notably,our novel structural reshaping strategy,involving the groundbreaking Euler-bend air-hole structure,significantly enhances the fabrication robustness,addressing the consistency difficulty associated with large-scale manufacturing of high-Q PC microcavity arrays.Silicon PC nanobeam cavities are experimentally demonstrated,featuring record-breaking loaded Q factors,large tolerance for the Euler-bend holes and extremely compact sizes of 6μm^(2).Importantly,to emphasize the on-chip high-resolution signal processing,the cavity-based microwave photonic filters(MPFs)offer unprecedented capabilities,including ultra-narrow bandwidths,an unlimited frequency tuning range and ultra-high rejection ratios using a micrometer-scale cavity.This breakthrough truly transcends the traditional limitations between the filter size,frequency resolution and tuning range.These exceptional characteristics position our MPFs with a cavity-based recordbreaking Q_(MPF)/S ratio(S:device size).
基金Project supported by the National Science Fund for Distinguished Young Scholars(No.61725503)the Zhejiang Provincial Natural Science Foundation,China(No.LZ18F050001)+1 种基金the National Natural Science Foundation of China(Nos.61431166001 and 1171101320)the National Major Research and Development Program,China(No.2016YFB0402502)
文摘A multimode silicon photonic integrated circuit(PIC) comprising a pair of on-chip mode(de)multiplexers with 10-mode channels and a multimode bus waveguide with sharp bends is demonstrated to enable multi-channel on-chip transmissions. The core width of the multimode bus waveguide is chosen such that it can support 10 guided modes, of which there are four transverse-magnetic polarization modes and six transverse-electric polarization modes. This multimode bus waveguide comprises sharp bends based on modified Euler curves. Experimental results demonstrate that the present silicon PIC enables the 10-channel on-chip transmission with a low inter-mode crosstalk of approximately-20 dB over a broad bandwidth of 1520–1610 nm even when the bending radius of the S-bend is as small as 40 μm. Compared with a silicon PIC using a conventional arc-bend with the same bending radius, our proposed PIC demonstrates a significant improvement.
