Article
Optics
Yuguang Zhang, Hongguang Zhang, Junwen Zhang, Jia Liu, Lei Wang, Daigao Chen, Nan Chi, Xi Xiao, Shaohua Yu
Summary: This article presents an ultrafast microring modulator (MRM) with improved performance through optimized PN junction doping concentration. The MRM demonstrates the transmission of a 240 Gb/s PAM-8 signal over 2 km standard single-mode fiber (SSMF). By introducing optical peaking and using a titanium nitride heater, the electro-optic bandwidth of the MRM is further extended. High bit rate modulations, such as 120 Gb/s NRZ, 220 Gb/s PAM-4, and 240 Gb/s PAM-8, are achieved using the high-performance and compact MRM. The article also investigates the bit error ratio (BER) for different received optical power and 2 km SSMF transmission.
PHOTONICS RESEARCH
(2022)
Article
Optics
Jiacheng Liu, Gangqiang Zhou, Jiangbing Du, Weihong Shen, Linjie Zhou, Zuyuan He
Summary: In this work, a silicon mode-loop Mach-Zehnder modulator (ML-MZM) with record-high modulation efficiency is proposed and experimentally demonstrated. The use of a mode-loop structure and an L-shaped PN junction enables efficient optical signaling without a high voltage driver, opening up possibilities for CMOS-compatible driverless modulation.
PHOTONICS RESEARCH
(2022)
Article
Chemistry, Analytical
Xinghong Chen, Lei Xiao, Xuejin Li, Duo Yi, Jinghan Zhang, Hao Yuan, Zhiyao Ning, Xueming Hong, Yuzhi Chen
Summary: This paper proposes a tapered fiber bioprobe based on Mach-Zehnder interference. The collection of optical sensing signals is achieved through a U-shaped transmission fiber structure, retaining the highly sensitive straight-tapered fiber MZI sensing structure. The bioprobe demonstrates the same sensing capability as the traditional sensor, while being flexible, convenient, and consuming less liquid. It has potential applications in immunoassays and early medical diagnosis.
Article
Optics
Weihong Shen, Gangqiang Zhou, Jiangbing Du, Linjie Zhou, Ke Xu, Zuyuan He
Summary: This study demonstrates a silicon integrated microring modulator (MRM) with record high-speed performances at the 2 μm waveband, providing prospects for silicon photonic integration and high-speed interconnection at this wavelength. The analysis of optical bistability in the 2 μm MRM is also presented, guiding the design and experimental investigation of similar devices.
PHOTONICS RESEARCH
(2022)
Article
Optics
Hao Yan, Yiwei Xie, Long Zhang, Daoxin Dai
Summary: This research proposes a wideband-tunable on-chip microwave photonic filter (MPF) that integrates a dual-drive Mach-Zehnder modulator (DDMZM) and ultrahigh-Q Mach-Zehnder-interferometer (MZI)-coupled microring resonators (MRRs) in cascade. The MPF achieves tunable resonance wavelength and bandwidth by introducing U-bend-MZI-coupled MRRs. The introduction of two cascaded U-bend-MZI-coupled MRRs enables the MPF to have high extinction ratio (ER) flat-top bandstop (or bandpass) responses and a tunable 3 dB bandwidth.
LASER & PHOTONICS REVIEWS
(2023)
Article
Physics, Applied
Peng Gao, Yuting Zhou, Tianqi Fu, Yibo Cao, Xiaolin Zheng, Ying Liu, Zimu Wang
Summary: The detection and control of humidity play a significant role in agriculture, new material development, biological research and protection, health services, and other industrial and agricultural production. This paper proposes a micro-nano photonic crystal fiber humidity sensor with a U-shaped structure, which allows for convenient detection work. The experiment demonstrates that this optical sensor exhibits good linearity within the humidity range of 42-62RH% and achieves humidity sensing of 27.62pm/RH%. The sensor's wide detection range enables optical fiber sensing in a larger humidity range.
MODERN PHYSICS LETTERS B
(2023)
Article
Optics
Liming Shen, Rongguo Lu, Rui Lin, Jiangbo Lyu, Guangbiao Wang, Meng Tan, Yong Liu
Summary: This paper proposes a wavelength-tunable microring-assisted Mach-Zehnder modulator based on graphene structure, which enhances device linearity and performance through analyzing modulation characteristic curves and utilizing special structures.
Article
Optics
Marco Eppenberger, Andreas Messner, Bertold Ian Bitachon, Wolfgang Heni, Tobias Blatter, Patrick Habegger, Marcel Destraz, Eva De Leo, Norbert Meier, Nino Del Medico, Claudia Hoessbacher, Benedikt Baeuerle, Juerg Leuthold
Summary: We demonstrate plasmonic micro-racetrack modulators for high-speed intensity-modulated transmission. These modulators offer wide bandwidth, improved temperature stability, and no self-heating effects. They can encode electrical data onto wavelength-multiplexed optical carriers.
Article
Physics, Multidisciplinary
Yang Wang, Pingyu Zhu, Shichuan Xue, Yingwen Liu, Junjie Wu, Xuejun Yang, Ping Xu
Summary: In this experiment, a high-spectral-purity single-photon source is engineered using a single-interferometer-coupled silicon microring. By adjusting the interferometer, different coupling conditions are achieved, leading to different quality factors for the pump and signal/idler. The spectral correlation of the signal and idler is intuitively demonstrated, and it is shown that higher quality factors result in increased spectral purity. The measurement of time-integrated second-order correlation of the signal photons yields a high value, indicating the potential for enhancing quantum interference and on-chip quantum information processing.
Article
Engineering, Electrical & Electronic
Weihua Zhang, Meng Wu, Xue Wang, Zhengrong Tong, Miaoyun Dong, Gangxiao Yan
Summary: A novel U-shaped few-mode fiber (FMF) salinity sensor that is insensitive to temperature is proposed. The sensor is made up of FMF fused between two sections of single-mode fiber (SMF). By bending the fiber, higher-order cladding modes are excited, making the sensor more sensitive to the external environment. Experimental results show a sensitivity of up to 1.847 nm/% in the salinity range of 0% to 10% and temperature-insensitive characteristics in the range of 5°C to 30°C. Compared to traditional optical fiber sensors, this sensor can avoid the effect of temperature on measurements and is easily fabricated, making it highly promising for seawater temperature and salinity measurement.
OPTICAL FIBER TECHNOLOGY
(2023)
Article
Optics
Haiming Qiu, Junfang Jiang, Lili Yao, Zhengping Dai, Zhengyong Liu, Hang Qu, Xuehao Hu
Summary: A fiber refractometer based on a C-shaped fiber and the Vernier effect is proposed and experimentally demonstrated. The sensor consists of cascaded fibers to form a sensing cavity and a reference cavity, and the Vernier effect is utilized to create spectral envelops for measuring refractive index variations. The sensor features ease of fabrication, high sensitivity, and capability of sensing both gaseous and liquid analytes.
Article
Physics, Multidisciplinary
Jiacheng Liu, Chao Wu, Gongyu Xia, Qilin Zheng, Zhihong Zhu, Ping Xu
Summary: We designed a reconfigurable dual-interferometer coupled silicon nitride microring resonator, which can continuously adjust the critical coupling bandwidth and quality factor of the resonant mode by tuning the integrated heater on the interferometer's arms. The ability to achieve a variety of coupling methods from under-coupling to over-coupling allows for tuning the quality factor over a wide range. Our design is important for adjustable filtering on silicon nitride photonic chips and optimization of nonlinear processes in quantum photonics and all-optical signal processing.
Article
Optics
John Rollinson, Mona Hella, Seyfollah Toroghi, Payam Rabiei, Ingrid Wilke
Summary: The proposed detection scheme utilizes thin-film lithium niobate Mach-Zehnder interferometers for high-frequency electric field detection, with a focus on devices capable of detecting high-strength electric fields. The device is characterized in the 1-40 GHz frequency range to estimate detection threshold, bandwidth, and EO modulation strength. The characterized device demonstrates a 0.13 V·m(-1)·Hz(-1/2) sensitivity and is expected to detect free-space electric fields up to 150 GHz based on extrapolated frequency response.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2021)
Article
Chemistry, Analytical
Francisco J. Casas, Guillermo Pascual-Cisneros
Summary: This paper studies different Mach-Zehnder modulation technologies for microwave polarimeters based on near-infrared frequency up-conversion. The use of InP technology is proposed for integration in the fabrication process, leading to advantages in terms of bandwidth, cost, and size reductions. The performance of various MZMs is compared, including a commercial unit with higher bandwidth and three InP integrated units. These modulators are coupled to a microwave polarimeter demonstrator to compare polarization measurement performances.
Article
Engineering, Electrical & Electronic
Qiaoling Chen, Wenlong Yang, Changxu Li, Chenshuai Guan, Min Wang, Jianming Lai, Xiaoyang Yu, Jianying Fan, Haibin Wu, Linjun Li, Lijie Zhang, Yanling Xiong
Summary: A novel fiber sensor coated with chitosan was proposed to detect copper ions concentration indirectly. By chemically modifying the chitosan and annealing the fiber sensor, stable interference spectra with ideal spectral fluctuations were demonstrated in the detection experiments within a range of copper ion concentrations.
IEEE SENSORS JOURNAL
(2021)
Article
Optics
Zheng Yong, Hong Chen, Xianshu Luo, Alperen Govdeli, Hongyao Chua, Saeed S. Azadeh, Andrei Stalmashonak, Guo-Qiang Lo, Joyce K. S. Poon, Wesley D. Sacher
Summary: We present power-efficient silicon nitride waveguide phase shifters for blue, green, and yellow wavelengths. These phase shifters have low power consumption due to a suspended structure and multi-pass waveguide design. Fabricated on 200-mm silicon wafers using deep ultraviolet lithography, these devices are part of an active visible-light integrated photonics platform. The average power consumption to achieve a n phase shift is measured to be 0.78, 0.93, 1.09, and 1.20 mW at wavelengths of 445, 488, 532, and 561 nm, respectively. These phase shifters are integrated into Mach-Zehnder interferometer switches with rise (fall) times of approximately 570 (590) μs.
Article
Optics
Wesley D. Sacher, Fu-Der Chen, Homeira Moradi-Chameh, Xinyu Liu, Ilan Felts Almog, Thomas Lordello, Michael Chang, Azadeh Naderian, Trevor M. Fowler, Eran Segev, Tianyuan Xue, Sara Mahallati, Taufik A. Valiante, Laurent C. Moreaux, Joyce K. S. Poon, Michael L. Roukes
Summary: This article introduces implantable silicon neural probes with integrated optical phased arrays and demonstrates optical beam steering in vitro. The formation of beams in brain tissue is simulated and characterized, and the probes are used for optogenetic stimulation and calcium imaging.
Article
Optics
Saeed Sharif Azadeh, Andrei Stalmashonak, Kevin W. Bennett, Fu-Der Chen, Wesley D. Sacher, Joyce K. S. Poon
Summary: This study reports multicore fibers with 10 and 16 linearly distributed cores that can operate in single mode in the visible spectrum. These fibers have low propagation loss and inter-core crosstalk, making them suitable for spatial division multiplexing in the visible spectrum.
Article
Nanoscience & Nanotechnology
Youngho Jung, Hyeon Han, Ankita Sharma, Junho Jeong, Stuart S. P. Parkin, Joyce K. S. Poon
Summary: Vanadium dioxide (VO2) is a material with phase transition characteristics that can be used in hybrid photonic integrated devices. By utilizing the phase transition properties of VO2, a compact optical memory element has been integrated into a silicon waveguide. This method allows for low-energy optical data storage in silicon photonic integrated circuits.
Editorial Material
Engineering, Electrical & Electronic
Patrick Lo Guo-Qiang, Juejun Hu, Luo Xian-Shu, Joyce Poon, Dries Van Thourhout, Fengnian Xia
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Yisu Yang, Kaixiang Gao, Huiyuan Zhang, Huaibing Liu, Xinyuan Lu, Xiaomin Ren, Yongqing Huang
Summary: A bi-layer 5-tip edge coupler is proposed in a multilayer silicon nitride-on-silicon waveguide platform, which achieves high coupling efficiency, broadband 1-dB drop bandwidth, and small footprint. Low-computation-cost electromagnetic numerical simulation and optimization strategies are applied to improve the reverse design of the complex couplers.
IEEE PHOTONICS JOURNAL
(2022)
Article
Engineering, Electrical & Electronic
Dan Yang, Yongqing Huang, Xiaofeng Duan, Kai Liu, Yisu Yang, Xiaomin Ren
Summary: This work investigates the optoelectronic mixing characteristics of the uni-traveling carrier photodetector (UTC-PD). Three different types of optoelectronic mixing modes are analyzed, and methods to improve the power of the mixing output signal are proposed. The results show that adjusting the peak-to-peak value of the RF signal and increasing the power of the optical signal are effective ways to enhance the output power of the mixing product.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2022)
Article
Multidisciplinary Sciences
Yiding Lin, Zheng Yong, Xianshu Luo, Saeed Sharif Azadeh, Jared C. Mikkelsen, Ankita Sharma, Hong Chen, Jason C. C. Mak, Patrick Guo-Qiang Lo, Wesley D. Sacher, Joyce K. S. Poon
Summary: Visible and near-infrared spectrum photonic integrated circuits are important technologies for addressing scaling challenges in quantum information and biosensing. This study reports the integration of silicon nitride-on-silicon waveguide photodetectors in a visible light photonic platform, which achieved high external quantum efficiency, wide opto-electronic bandwidth, and high avalanche gain-bandwidth product.
NATURE COMMUNICATIONS
(2022)
Article
Biophysics
Jianfeng Li, Armin Reimers, Ka My Dang, Michael G. K. Brunk, Jonas Drewes, Ulrike M. Hirsch, Christian Willems, Christian E. H. Schmelzer, Thomas Groth, Ali Shaygan Nia, Xinliang Feng, Rainer Adelung, Wesley D. Sacher, Fabian Schuett, Joyce K. S. Poon
Summary: Engineered neural tissues can be used to study neurological conditions and drug screening. This study demonstrates the integration of optical dopamine sensors into three-dimensional tissue cultures, providing a way to monitor neurochemical concentrations in real time.
BIOSENSORS & BIOELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Jiawei Du, Xuejie Wang, Yongqing Huang, Shaoyu Wang, Mingxi Yang, Xiaofeng Duan, Kai Liu, Yisu Yang, Xiaomin Ren
Summary: A cascade array structure and depleted layer thickness design method for terahertz applications of uni-traveling-carrier photodetectors (UTC-PDs) is proposed. The cascade array structure effectively reduces overall device capacitance and increases the 3dB bandwidth from 203 GHz to 255 GHz, compared to a high-speed single UTC-PD with a diameter of 3 μm. Further improvement to 267 GHz is achieved through thickness optimization. The combination of cascade array structure and depleted layer thickness optimization significantly improves the saturation output power of the device at 100, 200, and 300 GHz, enabling the design of cascade UTC-PD array for terahertz band applications.
IEEE JOURNAL OF QUANTUM ELECTRONICS
(2023)
Proceedings Paper
Engineering, Electrical & Electronic
S. Menezo, Z. Yong, K. Froberger, T. Thiessen, J. C. C. Mak, F. Denis-le Coarer, M. Peyrou, L. Milord, J. Da Fonseca, C. Jany, P. Grosse, F. Mazur, J. K. S. Poon
Summary: In this work, we present a silicon IQ modulator that is integrated with a III-V/Si semiconductor optical amplifier (SOA) at the output. We demonstrate the successful operation of 40GBaud PAM4 using one of the Mach Zehnder modulators with an SOA gain of 10dB.
2022 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION (OFC)
(2022)
Proceedings Paper
Engineering, Electrical & Electronic
Yiding Lin, Jason C. C. Mak, Hong Chen, Xin Mu, Andrei Stalmashonak, Youngho Jung, Xianshu Luo, Patrick G-Q Lo, Wesley D. Sacher, Joyce K. S. Poon
Summary: A novel low-loss silicon nitride bi-layer fiber-to-chip edge coupler was reported on 200-mm silicon wafers for visible spectrum photonic circuits, achieving minimum per-facet coupling loss around 2.6dB at lambda=488nm (TM) and polarization-independent coupling with around 3.2-dB loss.
2021 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)
(2021)
Proceedings Paper
Engineering, Electrical & Electronic
Yiding Lin, Zheng Yong, Xianshu Luo, Patrick G-Q Lo, Wesley D. Sacher, Joyce K. S. Poon
Summary: The study presents silicon nitride waveguide-integrated silicon lateral p-i-n photodiodes with high responsivity and external quantum efficiency.
2021 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)
(2021)
Proceedings Paper
Engineering, Electrical & Electronic
Saeed Sharif Azadeh, Andrei Stalmashonak, Kevin W. Bennett, Fu-Der Chen, Wesley D. Sachet, Joyce K. S. Poon
Summary: The study demonstrates 10- and 16-core multicore fibers operating in single mode with minimal loss in the visible spectrum. These fibers are designed for emerging applications that require spatial division multiplexing in the visible spectrum.
2021 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)
(2021)
