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Silicon chip-scale space-division multiplexing: from devices to system

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Science China(Information Sciences) 2018年第8期61卷 33-50页

作者： Yu YU Chunlei SUN xinliang zhang Wuhan National Laboratory for Optoelectronics and School of Optical and Electrical Information Huazhong University of Science and Technology

Space-division multiplexing(SDM) technique has attracted increasing attentions recently, because it provides an effective way to increase transmission capacity. With the continuous and exponential increase in data demands, high-density integration of silicon photonic components is of significant interest in terms of link price, performance and power consumption. The multimode/mutlicore devices applied to achieve diverse functionalities are key building blocks to construct a chip-scale SDM system based on a silicon on insulator(SOI) platform. This study reviews the recent progress of multimode/multicore devices, which enable coupling, multiplexing/demultiplexing, transmitting switching, as well as modulation and *** on these devices, a complete on-chip SDM system is constructed and discussed.

关键词： integrated optics devices space-division multiplexing optical switching devices

Enhanced mid-to-near-infrared second harmonic generation in silicon plasmonic microring resonators with low pump power

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Photonics Research 2014年第5期2卷 143-149页

作者： Jihua zhang Eric Cassan xinliang zhang Wuhan National Laboratory for Optoelectonics&School of Optical and Electronic Information Huazhong University of Science and TechnologyWuhan 430074China Institut d’Electronique Fondamentale UniversitéParis-SudOrsay 91405France e-mail:eric.cassan@u‑psud.fr

We propose an efficient and low-power second harmonic generation(SHG)process in a silicon-compatible hybrid plasmonic microring *** making the microring resonator doubly resonant at the fundamental wavelength of 3.1μm and second harmonic wavelength of 1.55μm,the SHG efficiency is enhanced by almost two orders of magnitude when compared to the previous result induced in a straight plasmonic waveguide.A SHG efficiency of 13.71%is predicted for a low pump power of 20 mW in a ring with radius of 2.325μ*** device provides a potential route for realizing efficient frequency conversion between mid-infrared and near-infrared wavebands on a chip.

关键词： pump resonator power

Photonic generation of ASK microwave signals with SSB format

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Frontiers of Optoelectronics 2023年第3期16卷 35-41页

作者： Weilei Gou Yuan Yu xinliang zhang Wuhan National Laboratory for Optoelectronics and School of Optical and Electronic Information Huazhong University of Science and TechnologyWuhan 430074China Optics Valley Laboratory Wuhan 430074China

Optical beating is the usual approach to generation of microwave ***,the highest frequency achievable for microwave signals is limited by the bandwidths of optoelectronic *** maximize the microwave frequency with a limited bandwidth of a photodetector(PD)and relieve the bandwidth bottleneck,we propose to generate microwave signals with the single sideband(SSB)format by beating a continuous wave(CW)light with an optical SSB *** simply adjusting the frequency diference between the CW light and the carrier of the optical SSB signal,the frequency of the generated microwave SSB signal is changed *** the experiment,amplitude shift keying(ASK)microwave signals with the SSB format are successfully generated with diferent carrier frequencies and coding bit rates,and the recovered coding information agrees well with the original pseudo random binary sequence(PRBS)of 2^(7)−1 *** proposed approach can signifcantly relieve the bandwidth restriction set by optoelectronic devices in high-speed microwave communication systems.

关键词： Single sideband modulation Amplitude shift keying Microwave signal generation Microwave communication

The adaptive control using BP neural networks for a nonlinear servo-motor

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控制理论与应用（英文版） 2008年第3期6卷 273-276页

作者： xinliang zhang Yonghong TAN Department of Automation School of Electronic Information and Electrical Engineering Shanghai Jiao Tong University Shanghai 200030 China College of Mechanical and Electronic Engineering Shanghai Normal University Shanghai 201814 China

The servo-motor possesses a strongly nonlinear property due to the effect of the stimulating input voltage, load-torque and environmental operating conditions. So it is rather difficult to derive a traditional mathematical model which is capable of expressing both its dynamics and steady-state characteristics. A neural network-based adaptive control strategy is proposed in this paper. In this method, two neural networks have been adopted for system identification （NNI） and control （NNC）, respectively. Then, the commonly-used specialized learning has been modified, by taking the NNI output as the approximation output of the servo-motor during the weights training to get sensitivity information. Moreover, the rule for choosing the learning rate is given on the basis of the analysis of Lyapunov stability. Finally, an example of applying the proposed control strategy on a servo-motor is presented to show its effectiveness.

关键词： Servo-motor Nonlinearity Neural networks based control Lyapunov stability Learning rate

χ(^(2)) nonlinear photonics in integrated microresonators

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Frontiers of Optoelectronics 2023年第3期16卷 1-23页

作者： Pengfei Liu Hao Wen Linhao Ren Lei Shi xinliang zhang Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China Optics Valley Laboratory Wuhan 430074China

Second-order(χ^((2))) optical nonlinearity is one of the most common mechanisms for modulating and generating coherent light in photonic *** to strong photon confnement and long photon lifetime,integrated microresonators have emerged as an ideal platform for investigation of nonlinear optical ***,existing silicon-based materials lack a χ^((2)) response due to their centrosymmetric structures.A variety of novel material platforms possessing χ^((2)) nonlinearity have been developed over the past two *** review comprehensively summarizes the progress of second-order nonlinear optical efects in integrated ***,the basic principles of χ^((2)) nonlinear efects are ***,we highlight the commonly used χ^((2)) nonlinear optical materials,including their material properties and respective functional *** also discuss the prospects and challenges of utilizing χ^((2)) nonlinearity in the feld of integrated microcavity photonics.

关键词： Second-order nonlinearity Integrated microresonators Frequency conversion Electro-optic efect

On-chip programmable pulse processor employing cascaded MZI-MRR structure

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Frontiers of Optoelectronics 2019年第2期12卷 148-156页

作者： Yuhe ZHAO Xu WANG Dingshan GAO Jianji DONG xinliang zhang Wuhan National Laboratory for Optoelectronics School of Optical and Electronic Information Huazhong University of Science and TechnologyWuhan 430074China

Optical pulse processor meets the urgent demand for high-speed,ultra wideband devices,which can avoid electrical confinements in various fields,e.g.,alloptical communication,optical computing technology,cohcrcnt control and microwave *** date,great efforts have been madc particularly in on-chip programmable pulse ***,we experimentally demonstrate a programmable pulse proceesor employing 16cascaded Mach-Zehnder interferometer coupled microring resonator(MZI-MRR)structure based on silicon-oninsulator *** micro-heaters loaded to the device,both amplitude and frequency tunings can be realized in each MZI-MRR *** to its reconfigurability and integration ability,First,it can serve as a fractional differentiator whose tuning range is 0.51-2.23 with deviation no more than 7%.Second,the device can be tuned into a programmable optical filter whose bandwidth varies from 0.15to *** optical filter is also shape ***,15-channel wavelength selective switches are generated.

关键词： integrated optics devices optical processing all-optical devices pulse shaping

Extinction ratio and resonant wavelength tuning using three dimensions of silica microresonators

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Photonics Research 2016年第5期4卷 191-196页

作者： Song Zhu Yang Liu Lei Shi Xinbiao Xu xinliang zhang Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology

In this paper, a multidimensional tuning method of the silica microcapillary resonator(MCR) is proposed and demonstrated whereby the extinction ratio(ER) as well as the resonant wavelength can be individually *** ER tuning range of up to 17 d B and a maximum tuning sensitivity of 0.3 d B/μm are realized due to the tapered profile of the silica optical microfiber(MF) when the MF is adjusted along its axial direction. Compared to direct tuning of the coupling gap, this method could lower the requirement for the resolution of displacement stage to micrometers. When the MF is adjusted along the axial direction of the silica microcapillary, a resonance shift of 3.06 nm and maximum tuning sensitivity of 0.01 nm/μm are achieved. This method avoids the use of an applied external field to control the silica microresonators. Moreover, when air is replaced by ethanol and water in the core of the silica microcapillary, a maximum resonance shift of 5.22 nm is also achieved to further enlarge the resonance tuning range. Finally, a microbubble resonator with a higher Q factor is also fabricated to achieve an ER tuning range of 8.5 d B. Our method fully takes advantage of the unique structure of the MCR to separately and easily tune its key parameters, and may broaden its applications in optical signal processing and sensing.

关键词： Extinction ratio and resonant wavelength tuning using three dimensions of silica microresonators MCR ER

Photonic generation of ultrawideband signals using a delay interferometer

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Frontiers of Optoelectronics 2010年第2期3卷 179-183页

作者： Fei WANG xinliang zhang Wuhan National Laboratory for Optoelectronics School of Optoelectronic Science and EngineeringHuazhong University of Science and Technology School of Mathematics and Physics Chongqing Institute of Technology

We demonstrate a novel scheme to generate ultrawideband(UWB) monocycle and doublet pulses by inputting a dark return-to-zero(RZ) signal into a delay interferometer(DI), which accords with the general features in future applied UWB system, namely, single optical source input, simple configuration and passive device. The two polarized interferential beams have a time delay and a phase difference when they propagate through the DI. By adjusting polarization controllers(PCs), the total phase difference, i.e., the sum of the relative opticalphase difference between two orthogonally polarized components caused by PCs and the optical-phase shift due to birefringence of the polarization-maintaining fiber(PMF), the orientation angle of the polarization beamsplitter(PBS) relative to the two axes of the PMF are able to be changed and controlled. When the appropriate conditions are met, UWB monocycle and doublet pulses are generated conveniently.

关键词： ultrawideband (UWB) delay interferometer (DI) polarization-maintaining fiber (PMF) interference

Simultaneous multi-channel RZ-OOK/DPSK to NRZ-OOK/DPSK format conversion based on integrated delay interferometers and arrayed-waveguide grating

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Science China Technological Sciences 2013年第3期56卷 558-562页

作者： XIANG Lei GAO DingShan ZOU BingRong HU ShouJin zhang xinliang Wuhan National Laboratory for Optoelectronics School of Optoelectronics Science and EngineeringHuazhong University of Science and Technology

Format conversion is enabling function at the interface of different networks with different optimal modulation ***,multi-channel signal processing function has its special significance for dense wavelength division multiplexing *** this paper,we designed and fabricated a delay interferometer cascaded with an arrayed-waveguide grating based on silicon on *** 4-channel return-to-zero on-off keying(RZ-OOK) to non-return-to-zero on-off keying(NRZ-OOK) and return-to-zero differential phase shift keying(RZ-DPSK) to non-return-to-zero differential phase shift keying(NRZ-DPSK) format conversions at 40 Gbit/s were realized with this integrated device,the output eye diagrams showed a good conversion *** to the mature fabrication technology,this device shows great potential for its small size,low power consumption and possibility of monolithic integration.

关键词： format conversion multi-channel monolithic integration