Ninghua Zhu

Constellation reshaping via nonlinear wave mixing for reconfigurable QAM channel manipulation

Jiabin Cui, Yuxuan Dong, Yanxia Tan, Guo-Wei Lu et autres

In this paper, an optical constellation reshaping-enabled reconfigurable quadrature amplitude modulation (QAM) channel manipulation scheme is proposed and verified through simulations. The proposed scheme enables constellation geometric shaping in 8QAM channels, information aggregation/de-aggregation in 16QAM channels, and builds flexible interconnection between nodes …

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Early apple moldy core classification via multi-modal sensing and SE-ResNet18

Ruifeng Wang, Ninghua Zhu, Xuexia Ma, Na Li et autres

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Rapid quantitative detection of psychrotrophic bacteria in raw milk using near-infrared transmission spectroscopy

Na Li, Xuexia Ma, Changhao Li, Ruifeng Wang et autres

Dairy spoilage caused by psychrotrophic bacteria and their metabolically derived heat-resistant enzymes poses a significant challenge to the global dairy industry. However, conventional detection methods are often hampered by limitations that restrict their application for rapid microbial safety assessment. To tackle this …

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Electro-Optic Modulation Sideband Dynamics in a Stably Locked Period-One Optically Injected Semiconductor Laser

Baoke Ding, Kunpeng Zhai, Wenting Wang, Yali Zhang et autres

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Optical Sequence Pattern Recognition for Multi-Wavelength BPSK Signals in Photonic Firewalls

Yanbin Shen, Yanxia Tan, Jiabin CUI, Yuefeng Ji et autres

This paper proposes an optical direct-detection pattern recognition scheme for multi-wavelength BPSK signals based on optical fourier transformation(OFT). The scheme utilizes time lens based OFT to convert 4×10G Baud BPSK signals into 40G Baud OTDM-BPSK signal. After delay and superposition processing, the …

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Optical Format Conversion from QPSK to OOK/PAM4 Channels Enabled by Polarization-assisted Phase-sensitive Amplifier

Yuxuan Dong, Yanxia Tan, Jiabin CUI, Guo-Wei Lu et autres

An optical format conversion scheme between Quadrature Phase-Shift Keying(QPSK) and On-Off Keying(OOK)/Four-level Pulse Amplitude Modulation(PAM-4) signals is proposed in this paper. This scheme is mainly enabled by polarization-assisted non-degenerated phase-sensitive amplifier(PSA) based vector moving, which separates the signal and the generated idler …

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Modulator-spurious-free electrooptic method for analyzing harmonic distortion of photodetectors with frequency-shifted heterodyne

Di Lei, Yifei Mu, Simou Wang, Engang Fu et autres

A modulator-spurious-free electro-optic method is proposed for analyzing the harmonic distortion of photodetectors (PDs) based on frequency-shifted optical heterodyne. The proposed method utilizes the heterodyne between phase-modulated optical signals and a frequency-shifted optical carrier as an actual overall electro-optical stimulus. The harmonic …

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Silicon-Based MZI-Embedded Fano Resonator With Widely Tunable Slope Rate and Its Applications

Bei Chen, Renheng Zhang, Jian Wang, Dechao Ban et autres

A widely tunable Fano resonator based on a MachZehnder interferometer-embedded microring resonator (MZER) is proposed and fabricated on a silicon-on-insulator platform. Fano resonance with asymmetric line shapes can originate from the interference and coupling between resonant modes of the core MZER structure. …

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Single-carrier single-drive two-tone optical stimulus generated by self-heterodyne interferometry for analyzing third-order intermodulation distortion (IMD3) of photodiodes

Di Lei, Ying Jun Xu, Sha Zhu, Yali Zhang et autres

A single-carrier single-drive two-tone method is proposed for analyzing the third-order intermodulation distortion (IMD3) of photodiodes (PDs) based on electro-optical self-heterodyne interferometry. A phase-modulated optical carrier is combined with its frequency-shifted replica as the practical optical stimulus for PD. Our method allows …

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Free-space terabit/s coherent optical links via platicon frequency microcombs

Wenting Wang, Hao Liu, Jiagui Wu, James F. McMillan et autres

Abstract Coherent frequency microcombs, generated in nonlinear high-Q microresonators and driven by a single continuous-wave laser, have enabled several scientific breakthroughs in the past decade, thanks to their high intrinsic phase coherence and individual comb line powers. Here, we report terabit-per-second-scale coherent …

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Probing linewidth dynamics with short-time delayed linear interferometer in integrated frequency microcombs

Wenting Wang, Dong IL Lee, Mingbin Yu, Dim‐Lee Kwong et autres

Optical frequency microcombs generate a series of equidistant, coherent frequency references over a broad spectrum, advancing spectroscopy, communications, metrology, and astronomy. Here, we design and fabricate a silicon nitride adiabatic ring microresonator that achieves low average dispersion with negligible avoided mode crossings. …

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Mapping ultrafast timing jitter in dispersion-managed 89 GHz frequency microcombs via self-heterodyne linear interferometry

Wenting Wang, Wenzheng Liu, Hao Liu, Tristan Melton et autres

Laser frequency microcombs provide a series of equidistant, coherent frequency markers across a broad spectrum, enabling advancements in laser spectroscopy, dense optical communications, precision distance metrology, and astronomy. Here, we design and fabricate silicon nitride, dispersion-managed microresonators that effectively suppress avoided-mode crossings …

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