Risultati della ricerca - Zuyuan He

In this paper, we propose a comprehensive electro-optical co-design framework for power-efficient high-speed VCSEL transmitter targeting at 50 Gbaud. The framework integrates a rate-equation based VCSEL chip model and driver circuit models. Subject to the transmitter specifications defined by IEEE 4...

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Dispersion engineering of microresonators is very important for applications, such as optical comb generation which desires wideband flat and small dispersion. In this paper, dispersion investigation has been carried out for whispering gallery mode (WGM) microresonators fabricated by laser micromach...

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Light field manipulation is an important technology for improving system-level efficiency of optical wireless power transfer (OWPT). In this paper, we propose and compare the Gerchberg-Saxton algorithm, direct binary search and genetic algorithm enabled light field optimization for adapting photovol...

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We propose a birefringence variation independent fiber-optic current sensor based on polarization diversity and a real-time state of polarization measurement technique. We theoretically and experimentally demonstrate the compensation for the degradation of Faraday effect due to the variation in bire...

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We demonstrate an ultrahigh-resolution optical time domain reflectometry (OTDR) system by using a mode-locked laser as the pulse source and a linear optical sampling technique to detect the reflected signals. Taking advantage of the ultrashort input pulse, the large detection-bandwidth, as well as t...

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In underwater visible light communication (UVLC) systems, it is important to support mobility of transceivers and enhance both the dynamic range of communication distance and the field of view (FOV) because the received optical power experiences significant variations when the transmission distance...

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In this paper, we present an application-oriented investigation of parasitic limitation on the large signal performance of VCSELs when multilevel modulation is applied. VCSELs with different damping are taken into consideration. The parasitic parameters are extracted by fitting the measured <inli...

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As for vertical-cavity surface-emitting lasers (VCSEL)-based optical pulse amplitude modulation (PAM) interconnection system, apart from the universal signal distortions like Gaussian noise and fiber dispersion, direct modulation of VCSEL specially induces level nonlinearity and level-dependent nois...

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We demonstrate the design and fabrication of a mode (de)multiplexer based on the tapered mode-selective coupler. The proposed device is directly inscribed in the substrate material by a needle-type liquid micro-dispenser and a three-axis robot stage using commercially available UV-curable resins. Th...

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A single-shot distributed dynamic strain sensor is proposed with high spatial resolution and broad detection bandwidth. Linear frequency modulated pulse is employed as the probe pulse, which not only solves the trade-off between spatial resolution and sensing distance, but also avoids the time-consu...

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Advanced modulation formats with intensity modulation and direct detection (IM&#x002F;DD) have shown promise in a short-reach optical communication system like data center interconnect. However, the conventional fiber transmission spectral window is mostly located at 850, 1310, and 1550&#x00...

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Distributed fiber-optic vibration sensors based on phase-sensitive optical time-domain reflectometry ( <inline-formula> <tex-math notation="LaTeX">$\phi$</tex-math></inline-formula>-OTDR) have found many applications in various fields. In this paper, we analyze the...

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The transparent window in optical fiber at 2-&#x03BC;m waveband enables a huge potential for fiber optical communications. Intensive efforts have been devoted to pursuit of photonic devices in this new band. The arrayed waveguide grating (AWG) is one of the key components for various functionali...

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We demonstrate a novel method for obtaining high spatial resolution optical frequency domain reflectometry (OFDR) utilizing recirculating frequency shifter for broadening the optical frequency sweeping. Twelve times broadened optical frequency sweeping is achieved. We obtain 0.97 cm spatial resoluti...

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We demonstrate integrated 1 &#x00D7; 4 power splitters at 2-&#x03BC;m spectral range with arbitrary power-splitting ratios. The devices are based on digital meta-structures that are designed by algorithm. Four devices with split ratios of 1:1:1:1, 2:2:1:1, 2:2:2:1, and 4:3:2:1 are inversely...

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In this paper, dyadic probabilistic shaping (PS) for pulse amplitude modulation (PAM) has been investigated and experimentally demonstrated for intensity-modulation and direct-detection optical interconnection systems. Improved achievable information rate can be obtained under the condition of limit...

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We demonstrate the absorption-based fiber humidity sensors working near 1950&#x00A0;nm wavelength which is a strong water absorption peak. No additional coating of humidity-sensitive material is needed for the proposed relative humidity (RH) fiber sensors. Two sensor structures including a taper...

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We studied the characteristics of coupled-core four-core fibers (CC-4CFs) with different core pitches both theoretically and experimentally. The spatial mode dispersions of different fibers were analyzed, and the result agrees well with theoretical ones. In the experiment, we achieved a spatial mode...

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