Huashun Wen

Nankai University

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Ninghua Zhu

State Key Laboratory on Integrated Optoelectronics

Kunpeng Zhai

Institute of Semiconductors

Qiankun Li

Soochow University

Xiongwei Yang

State Key Laboratory of ASIC and System

Sha Zhu

State Grid Corporation of China (China)

Qi Xu

Zhejiang Lab

Heng Zhou

University of Electronic Science and Technology of China

Jiali Yang

Hunan University

Yameng Li

Jilin University

Jiabin Cui

Beijing University of Posts and Telecommunications

Cooperative Institutions

Chinese Academy of Sciences

University of Chinese Academy of Sciences

University of Electronic Science and Technology of China

State Key Laboratory on Integrated Optoelectronics

Institute of Semiconductors

Beijing University of Posts and Telecommunications

Huazhong University of Science and Technology

University of Science and Technology of China

Nankai University

State Key Laboratory of Information Photonics and Optical Communications

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A Novel Optical Frequency-Hopping Scheme Using Dual Drive Mach–Zehnder Modulator

IEEE photonics journal (2021)

Ya Jin Shaokang Chen Zhuang Xie Kunpeng Zhai Changda Xu

A novel optical frequency-hopping (OFH) scheme using dual-drive Mach-Zehnder modulator (DD-MZM) is proposed and demonstrated for secure transmission in fiber-optic networks. In the proposed scheme, by adjusting the phase difference between the radio frequency (RF) signals loaded on the two arms of the DD-MZM, and filtering the center carrier by fiber Bragg grating (FBG), thus the upper and lower output spectra can be realized randomly hop between the positive and negative first-order sidebands and serve as carriers for data modulation. And the data of different users are divided into many data slices in the time domain and then modulated to these carriers. To verify the feasibility of the proposed OFH scheme, we demonstrate an error-free transmission through 40 km fiber with 10 Gbps hopping rate and 10 Gbps data rate by simulation tools. In addition, we also establish a theoretical model to evaluate the security performance quantitatively, and the results show that the computing power required by illegal third parties to crack through brute force reaches 1.0710e27 calculations per second under certain conditions, which is almost impossible. Our OFH scheme has provided a deeper insight into physical layer security.

Fiber Bragg Grating

Modulation (music)

Electro-optic modulator

10.1109/jphot.2021.3136856

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Nanoscale Strain Mapping in SIMOX 3-D Sculpted Silicon Waveguides Using Tip-Enhanced Raman Spectroscopy

IEEE photonics journal (2016)

Huashun Wen Yuefeng Ji Bahram Jalali

Strain in silicon plays a significant role in exploring electro-optical material, boosting transistor performance, tuning birefringence of optical silicon waveguides, and so on. In this paper, we measured, for the first time, the nanoscale strain in the SIMOX 3-D sculpted silicon waveguides using tip-enhanced Raman spectroscopy (TERS). A model, which relates the observed Raman peak shifts to the localized stresses for our TERS experiments, was presented. The tip-induced electric-field enhancements, tip-induced depolarization of incident light, and oblique incidence geometry of the TERS system were included in the model. Both polarizations of incident light and Raman scattered light are selected appropriately with the guidance of the model for obtaining enough electric-field enhancements and accurately calculate the stresses. A 2-D stress map inside the silicon waveguide with spatial resolution of about 20 nm was obtained, and corresponding strains were calculated based on Hooke's law. We observed that the stresses are compressive, and the strains show inhomogeneity. The origins of strain and the strain-induced second-order optical susceptibility inside the SIMOX 3-D sculpted buried silicon waveguides are discussed and analyzed. The mapping of 2-D nanoscale strain and the analysis of second-order optical susceptibility in this work suggest that the SIMOX 3-D sculpted strained silicon might be a potential metamaterial for electro-optical modulation and optical signal processing. Moreover, the presented TERS model could be a valuable tool for probing strain in strained silicon devices.

Waveguide

10.1109/jphot.2016.2612360

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Data Fragmentation Multipath Secure Coherent Optical Communication System Based on Electrical Signal Processing

IEEE photonics journal (2022)

Kunpeng Zhai Sha Zhu Yinfang Chen Huashun Wen Ya Jin

In this paper, we report a novel optical data fragmentation multipath (ODFM) scheme for coherent optical communication based on electrical signal processing in simulation. Under the control of a pseudo-random sequence (PRBS), we randomly disperse the user data and assign them to paths corresponding to different wavelengths for transmission. To reduce the hardware complexity of the system and the requirements for receiver sensitivity, we adopt binary phase shift keying (BPSK) modulation and homodyne coherent detection in the scheme. To verify the feasibility of the proposed ODFM scheme, we demonstrated an error-free transmission through 40 km fiber with 10 Gbps hopping rate and 10 Gbps data rate by the simulation tools. The proposed scheme can be widely used in the physical layer secure communication of backbone network, large-scale data transmission and physical layer encryption of free space optical (FSO) communication.

10.1109/jphot.2022.3195753

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Citations (4)

Tunable terahertz all-dielectric linear-to-circular polarization conversion metasurface

Optica Applicata (2022)

Xiacao Ju Weiguang Wang Bingchao Liu Yanzhao Hou Huashun Wen

Terahertz (THz) linear-to-circular (LTC) polarization conversion plays a crucial role in imaging and 6G wireless communication. This paper will give an account of a thermally tunable THz LTC polarization converter by using the active all-dielectric metasurface. It consists of zirconium oxide (ZrO2) microsphere resonators, active strontium titanate (STO) cladding, and flexible polyimide substrate. Through numerical simulation, the amplitude of the ellipticity of the proposed polarization converter at 0.265 THz is –1, indicating that perfect right-hand circular polarization (RHCP) wave is achieved. Meanwhile, the amplitude of the ellipticity is less than –0.8 between 0.247 and 0.278 THz (relative bandwidth is 12%). In addition, with the temperature changes of 180 K (from 200 to 380 K), the operating frequency of the converter can be tuned from 0.220 to 0.291 THz, a sensitivity about 39 GHz/100 K is achieved. Besides, the modulation depth of the ellipticity amplitude can achieve 92% at 0.220 THz, which demonstrates that the converter can output terahertz wave with different polarization states, and the device can be fabricated on a large scale. These perfect conversion performances show that the converter has potential applications in high-speed communication and imaging.

Cladding (metalworking)

10.37190/oa220406

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Fast and accurate extraction of ultra-high quality factor from cavity ring-down measurement

arXiv (Cornell University) (2024)

Yang Yanping Shihan Liu Yong Geng Huashun Wen Heng Zhou

Cavity ring-down is an essential test to measure ultra-high quality factor (UHQ) optical cavities, which is, however, frequently misinterpreted due to lacking of a specified analysis guideline. Here we clarify the basic property of cavity ring down and present a step-by-step method that enables extraction of the overall quality factor, as well as the intrinsic loss and coupling state of UHQ cavities with better fidelity and simplicity than prior schemes. Our work can facilitate acurrate design and characterization of UHQ cavities for ultra-low noise lasers, high finesse reference cavities, and ultra-narrow optical filters.

Cavity Ring-Down Spectroscopy

10.48550/arxiv.2406.15423

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All-Optical Format Conversion for Rectangular 8QAM Signals Based on Phase-Sensitive Amplification and Nonlinear Mach-Zehnder Interferometer

IEEE photonics journal (2024)

Qiankun Li Xiongwei Yang Huashun Wen Yameng Li Qi Xu

An all-optical format conversion (AOFC) scheme for the input 30 Gbit/s rectangular 8-ary quadrature amplitude modulation (8QAM) signal is proposed and numerically investigated based on phase-sensitive amplification (PSA) and nonlinear Mach-Zehnder interferometer (MZI). Firstly, the input rectangular 8QAM signal is orthogonal decomposed into the inphase and quadrature components based on PSA, respectively. The in-phase component is the 4-ary amplitude and phase shift keying (4APSK) signal and the quadrature component is the binary phase shift keying (BPSK) signal. Secondly, the converted 4APSK signal is transmitted into one piece of highly nonlinear fiber (HNLF) to obtain the phase-distorted two-amplitude and two-phase (2A-2P) signal based on the self-phase modulation (SPM) effect. After adjusting the power of the 2A-2P signal, it is injected into one nonlinear MZI to eliminate the amplitude difference of the inner and the outer rings of the 2A-2P signal. The 2A-2P signal can be converted into the regular quadrature phase shift keying (QPSK) signal by the nonlinear MZI with phase preservation. Thirdly, the converted BPSK and QPSK signals are coherently superposed in one 3-dB optical coupler (OC) to get the aggregated rectangular 8QAM signal and other types of 8QAM signals. The proposed scheme can also be extended to realize the AOFC from the 16-ary quadrature amplitude modulation (16QAM) signal to two QPSK signals. The constellation diagrams, amplitude and phase histograms, error vector magnitude (EVM) and bit error rate (BER) of the relevant optical signals are measured to evaluate the system performance. The proposed scheme can be equipped with the optical gateway to enable all-optical interconnection of optical networks with different modulation formats.

10.1109/jphot.2024.3361503

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Citations (1)

All-Optical Regeneration and Format Conversion for 4APSK Signals Based on Nonlinear Effects in HNLF

IEEE photonics journal (2023)

Qiankun Li Huashun Wen Jiali Yang Qi Xu Xiongwei Yang

An all-optical format conversion and regeneration scheme about 4-ary amplitude and phase shift keying (4APSK) signals is proposed and numerically simulated based on nonlinear effects in the high nonlinear fiber (HNLF). The input 4APSK signal is firstly converted into a regular quadrature phase shift keying (QPSK) signal by the nonlinear Mach-Zehnder interferometer (MZI) based on the self-phase modulation (SPM). Secondly, a degenerate phase-sensitive amplification (PSA) based on the four-wave mixing (FWM) is utilized to convert the regular-QPSK into two binary phase shift keying (BPSK) signals. The nonlinear MZI configuration is also used to compress the amplitude noise of BPSK. Thirdly, one phase shifter and one variable optical attenuator (VOA) are used to adjust the relative phase and power relationships of the two amplitude-regenerated BPSK signals. The regenerated 4APSK and converted QPSK signals can be generated in one 3-dB optical coupler through coherent addition of the two regenerated BPSK signals. The error-vector-magnitude (EVM) and the bit-error-rate (BER) are calculated and compared to evaluate the scheme performance. The proposed scheme can be applied as an optical regenerator or format convertor at the network gateway to increase the transmission distance or connect optical networks with different modulation formats.

Signal regeneration

Amplitude-shift keying

Modulation (music)

10.1109/jphot.2023.3235905

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Citations (2)

Across-dimensional optical constellation de-aggregations from QAMs to PAMs in optical transparent networks

Optics & Laser Technology (2024)

Jiabin Cui Yumiko Tan Guo-Wei Lu Yuefeng Ji Huashun Wen

QAM

Constellation diagram

10.1016/j.optlastec.2024.110737

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Citations (2)

A single-passband microwave photonic filter with sub-MHz bandwidth

Huashun Wen Ning Hua Zhu Ming Li

A single-passband microwave photonic filter with 3 dB bandwidth of 650 kHz, center frequency drift of ±50kHz over spectral range of 2-18 GHz is experimentally demonstrated based on a Brillouin dynamic grating. To the best of our knowledge, this is the highest spectral resolution single-passband MPF reported to date, with high stability, wide tunability and a simple structure.

Passband

Center frequency

Free spectral range

10.23919/mwp48676.2020.9314378

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Photonic Generation of Microwave Waveforms with Tunability and Anti-Dispersion Capability

Xinyan Zhang Sha Zhu Huashun Wen Kunpeng Zhai Yu Liu

10.1109/cleo-pr60912.2024.10676423

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