Article
Engineering, Electrical & Electronic
Xueyang Li, Chen Cheng, Zixian Wei, H. Y. Fu, Yanfu Yang, Weisheng Hu
Summary: In this study, a combined digital signal processing scheme consisting of partial pre-emphasis and nonlinear pre-distortion is proposed to address the nonlinear and low-pass response issues in blue LED-based underwater optical wireless communication (UOWC) systems, improving the capacity and reach of the systems.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Kostas Sozos, Stavros Deligiannidis, George Sarantoglou, Charis Mesaritakis, Adonis Bogris
Summary: The transition to the edge-cloud era demands ultra-high data rate signals and power efficient optical modules. Addressing the challenges of non-linearities and power fading is crucial for high symbol rate systems. In this article, machine learning techniques and neuromorphic processing are proposed as promising solutions for mitigating transmission impairments. The article presents recent work on bidirectional recurrent neural networks and neuromorphic recurrent optical spectrum slicers for non-linearity compensation and power fading mitigation respectively. Evaluations are conducted to compare the performance of these techniques with the state-of-the-art methods in high-speed optical communication systems.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Lin Chang, Andreas Boes, Haowen Shu, Weiqiang Xie, Haijin Huang, Jun Qin, Bitao Shen, Xingjun Wang, Arnan Mitchell, John E. Bowers
Summary: Photonic integrated circuits have a wide range of applications, and the development of new second order nonlinear optical waveguide platforms opens up opportunities for low-power optical signal processing. Research on lithium niobate on insulator and aluminum gallium arsenide on insulator has demonstrated ultra-efficient conversion, paving the way for high-performance optical signal processing.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Chaoran Huang, Aashu Jha, Thomas Ferreira de Lima, Alexander N. Tait, Bhavin J. Shastri, Paul R. Prucnal
Summary: The integrated device based on microring resonator assisted Mach-Zehnder interferometer offers high programmability and switching contrast for nonlinear optical signal processing. It can serve as a multi-purpose optical processor with functionalities such as signal contrast improvement and pulse carving. The device shows potential for system-level applications in optical interconnects and photonic neural networks.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Tsuyoshi Konishi, Yuta Kaihori, Masayuki Makino
Summary: This study proposes a method for uplink applications in beyond 5G that takes advantage of low frequency technology and uses photonic assistance for temporal waveform compression. It has the potential to upgrade signal frequency from MHz to more than tens GHz while maintaining a high ENOB level.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Review
Chemistry, Analytical
Luigi Sirleto, Giancarlo C. Righini
Summary: The combination of integrated optics technologies with nonlinear photonics has led to groundbreaking devices and applications. Materials with high nonlinear coefficients and guided-wave structures enhance the nonlinear properties, enabling various applications in optical communications, signal processing, computing, and quantum optics. This field encompasses research on materials, fabrication processes, integration platforms, and waveguide structures.
Article
Engineering, Electrical & Electronic
Mark Pelusi, Ryosuke Matsumoto, Takashi Inoue, Shu Namiki
Summary: This study demonstrates the compensation of nonlinear distortion in long distance communication links caused by the power induced Kerr effect. The insertion of an optical phase conjugation module and a stepwise parameter profiled fiber module improves the propagation symmetry and overall distortion cancellation. Measurements show significant improvement in signal quality and extended transmission reach using these modules.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Sang-Yuep Kim, Takahiro Suzuki, Jun-Ichi Kani, Tomoaki Yoshida
Summary: The proposed carrier phase recovery algorithm enables the software-driven optical coherent receivers and shows high performance in real-time streaming. This enhancement of disaggregated optical coherent receivers will significantly improve system flexibility and scalability.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Engineering, Electrical & Electronic
Kosuke Suzuoki, Daisuke Hisano, Sho Shibita, Kazuki Maruta, Akihiro Maruta
Summary: This study proposes an optimal quantizer based on the Lloyd-Max algorithm to improve the effect of power ratio increase between multiplexed ONUs in a PD-NOMA-PON system.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Review
Optics
Mario Chemnitz, Saher Junaid, Markus A. Schmidt
Summary: Softphotonics is a new discipline that utilizes soft matter as waveguide materials with versatile functionalities. The flexible properties of soft matter show great potential for exploiting nonlinear in-fiber phenomena to develop a new generation of optical light sources and signal processors. This review highlights the current state of development of nonlinear photonics in liquid-filled fibers, revisits the material properties of prominent solvents, and summarizes recent advances in liquid-core fiber optics including unique phenomena and dispersion control.
LASER & PHOTONICS REVIEWS
(2023)
Article
Engineering, Electrical & Electronic
Luis Gonzalez-Guerrero, Haymen Shams, Irshaad Fatadin, John Edward Wu, Martyn J. Fice, Mira Naftaly, Alwyn J. Seeds, Cyril C. Renaud
Summary: This study introduces and demonstrates a photonic wireless bridge operating at a carrier frequency of 250 GHz, utilizing tone-assisted carrier recovery to mitigate phase noise from free-running lasers. The wireless bridge achieves 50 Gbit/s transmission in a single channel configuration and high-capacity transmission across the full band in wavelength division multiplexing scenarios. However, the limited transmission distance of 10 cm is attributed to the low power emitted by the uni-travelling carrier photodiode used in the experiments.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Optics
Asahi Sueyoshi, Daisuke Hisano, Akihiro Maruta, Ken Mishina
Summary: In this study, the spectral efficiency and transmission characteristics of QPSK and 16QAM signals generated by all-optical modulation format converters are numerically investigated. It is found that the converted signals can be transmitted up to 19,500 km and 4,000 km in single and 8-channel transmission, respectively, while maintaining sufficient channel spacing. Therefore, the converted signals are applicable for inter-datacenter networks, which typically have shorter transmission distances.
OPTICS COMMUNICATIONS
(2023)
Article
Engineering, Electrical & Electronic
Mert Kalfa, Sadik Yagiz Yetim, Arda Atalik, Mehmetcan Gok, Yiqun Ge, Rong Li, Wen Tong, Tolga M. Duman, Orhan Arikan
Summary: Semantic signal processing and communications are important for developing sensor devices and networks. The extraction of semantic signals from raw input signals is crucial and has become more feasible with advances in ML and AI techniques. Accurate extraction of semantic signals and detection of semantic innovation are critical for reliable processing and communications.
IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS
(2023)
Article
Engineering, Electrical & Electronic
Gai Zhou, Lin Sun, Chao Lu, Alan Pak Tao Lau
Summary: A new theoretical framework for optical communications based on Nonlinear Fourier Transform (NFT) and digital coherent transceivers is proposed to mitigate nonlinear distortions and improve detection performance by jointly modulating discrete eigenvalue lambda and b-coefficents b(lambda). The proposed multi-symbol DSP algorithms successfully achieved a record single-polarization discrete eigenvalue transmission of 64 Gb/s (net 54 Gb/s) over 1200 km in experiments.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Engineering, Electrical & Electronic
Chaoran Huang, Dongliang Wang, Weipeng Zhang, Benshan Wang, Alexander N. Tait, Thomas Ferreira de Lima, Bhavin J. Shastri, Paul R. Prucnal
Summary: This paper presents a silicon photonic system combining high-speed silicon photonic devices with a novel blind source separation algorithm to solve crosstalk issues in space-division multiplexing. The proposed system offers superior energy efficiency, cost efficiency, and reduced latency, while providing flexibility and interference tolerance.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Review
Engineering, Electrical & Electronic
Josyl Mariela Rocamora, Ivan Wang-Hei Ho, Wan-Mai Mak, Alan Pak-Tao Lau
IET SIGNAL PROCESSING
(2020)
Article
Engineering, Electrical & Electronic
Qun Zhang, Yanfu Yang, Changjian Guo, Xian Zhou, Yong Yao, Alan Pak Tao Lau, Chao Lu
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2020)
Article
Optics
Jie Gao, Xian Zhou, Qirui Fan, Dongxu Lu, Jiahao Huo, Jinhui Yuan, Keping Long, Changyuan Yu, Alan Pak Tao Lau, Chao Lu
OPTICS COMMUNICATIONS
(2020)
Editorial Material
Chemistry, Multidisciplinary
Jinlong Wei, Lilin Yi, Elias Giacoumidis, Qixiang Cheng, Alan Pak Tao Lau
APPLIED SCIENCES-BASEL
(2020)
Article
Computer Science, Information Systems
Jiahao Huo, Xian Zhou, Chao Shang, Wei Huangfu, Jinhui Yuan, Huansheng Ning, Keping Long, Changyuan Yu, Alan Pak Tao Lau, Chao Lu
SCIENCE CHINA-INFORMATION SCIENCES
(2020)
Article
Optics
Bin Chen, Ziliang Ruan, Jinyao Hu, Jingyi Wang, Chao Lu, Alan Pak Tao Lau, Changjian Guo, Kaixuan Chen, Pengxin Chen, Liu Liu
Summary: A two-dimensional grating coupler is designed and demonstrated for coupling light between a standard single-mode fiber and ridge waveguides on an X-cut lithium niobate thin-film. By using different shapes of grating cells, coupling losses and polarization dependent losses are reduced.
Article
Engineering, Electrical & Electronic
Yaxi Yan, Faisal Nadeem Khan, Bin Zhou, Alan Pak Tao Lau, Chao Lu, Changjian Guo
Summary: A novel ultra-long distributed vibration sensor utilizing forward transmission and coherent detection is proposed, demonstrating localization of vibration events ranging from several hundred Hz to tens of kHz over a total length of 1230 km sensing fiber. Detection of frequencies from infrasound to ultrasound is possible, making it a promising candidate for vibration event detection and localization in long-haul and ultra-long-haul fiber links.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Engineering, Electrical & Electronic
Qun Zhang, Yanfu Yang, Chao Gu, Yong Yao, Alan Pak Tao Lau, Chao Lu
Summary: The proposal introduces a dual-polarization transceiver imbalance monitoring scheme for coherent systems using square QAM signals, with technical advantages of multi-dimensionality, wide monitoring range, and modulation-format transparency. The scheme involves a polarization scrambler and DSP modules for monitoring imbalances between transmitter and receiver through coherent detection.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Engineering, Electrical & Electronic
Qirui Fan, Chao Lu, Alan Pak Tao Lau
Summary: This study explores the integration of adaptive DSP blocks as additional stateful NN layers, enabling the application of standard backpropagation-like training algorithms to address dynamic transmission impairments. By combining linear and nonlinear parameters in the digital backpropagation algorithm, a more generalized approach for fiber nonlinearity compensation is achieved, showcasing improved performance over existing DBP variants. Through the developed framework, GDBP demonstrates a novel and optimal solution for single-channel DBP-based fiber nonlinearity compensation, with potential performance gains in complexity-constrained scenarios.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Engineering, Electrical & Electronic
Xiong Wu, Jianbo Zhang, Qirui Fan, Zhongwei Tan, Jianping Li, Xingwen Yi, Zhaohui Li, Alan Pak Tao Lau, Chao Lu
Summary: This paper investigates the application of cylindrical vector mode as the eigenmode of optical fibers in high-capacity mode-division multiplexing (MDM) systems. Experimental results demonstrate the robustness and reliability of the MDM transmission system based on Kramers-Kronig reception and the 4 x 4 multi-user constant modulus algorithm (MU-CMA).
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Proceedings Paper
Engineering, Electrical & Electronic
Faisal N. Khan, Qirui Fan, Jianing Lu, Gai Zhou, Chao Lu, Alan Pak Tao Lau
2020 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXPOSITION (OFC)
(2020)
Proceedings Paper
Engineering, Electrical & Electronic
Qirui Fan, Jianing Lu, Gai Zhou, Derek Zeng, Changjian Guo, Linyue Lu, Jianqiang Li, Chongjin Xie, Chao Lu, Faisal Nadeem Khan, Alan Pak Tao Lau
2020 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXPOSITION (OFC)
(2020)
Proceedings Paper
Engineering, Electrical & Electronic
Xiatao Huang, Xingwen Yi, Qirui Fan, Taowei Jin, Gai Zhou, Jing Zhang, Bo Xu, Fan Li, Zhaohui Li, Chao Lu, Alan Pak Tao Lau
2020 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)
(2020)