Photonics for Emerging Applications in Communication and Sensing II

Dear Colleagues,

Photonics play a vital role as a key enabler in emerging and promising applications in communication and sensing. These applications encompass datacenters, automotive driving, 5G wireless networks, cloud computing, Internet of Things (IoT), and virtual reality. This Special Issue aims to focus on the recent advancements and future challenges in photonic technologies that enable and support these emerging applications. It covers topics such as optical fibers, photonic devices and systems, and signal processing techniques.

This Special Issue constitutes the second volume of our previous Special Issue, titled "Photonics for Emerging Applications in Communication and Sensing". We invite papers on a wide range of topics, which include, but are not limited to, the following:

• Silicon passive and active devices for data communication, 5G, sensing, or imaging.
• Optical fiber subsystems for communication, detection, and sensing.
• Photonic signal processing leveraging nonlinear optics for optical networks.
• Digital signal processing techniques for optical transmission systems.
• Photonic integrated circuits for communication, sensing, and computing.
• Integrated communication and sensing systems.
• Optical biochemical sensing systems.
• Cutting-edge developments in optical network technology.
• Machine learning in optical systems and networks.

Dr. Guo-Wei Lu
Prof. Dr. Zhenzhou Cheng
Prof. Dr. Ting-Hui Xiao
Guest Editors

Manuscript Submission Information

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• silicon photonics
• optical fiber subsystems
• photonic integrated circuits
• optical network technology

Title: Efficient Direct Detection of Twin-SSB-QPSK Using a Single Detector
Authors: Hong-Bo Zhang 1*, Jiao Liu1, Guo-Wei Lu2, Wei-Wei Ling1, Min Zhang1, Feng Wan1, Ju Cai1
Affiliation: 1. Chengdu University of Information Technology, Chengdu 610225, China 2. Institute for Materials Chemistry and Engineering, Kyushu University, Fukuoka 816-8580, Japan
Abstract: We propose a novel approach for achieving Twin-Single-sideband (Twin-SSB) signal reception without optical band-pass filters (OBPF) at the receiver. Our method utilizes coherent modulation of two quadrature phase shift keying (QPSK) signals into Twin-SSB-QPSK optical signals at the transmitter. At the receiver, a single photodetector (PD) is employed to receive the transmitted optical signal, enabling the extraction of a 16-ary quadrature amplitude modulation (16QAM) signal. This technique significantly reduces the requirements of linearity and effective number of bits (ENOB) for the transmitter components in high-speed transmission systems, thereby effectively lowering the overall implementation cost. To validate our proposed scheme, we conducted experimental demonstrations of 112Gb/s 16-QAM with direct detection. The bit error rates (BERs) of 7.84 × 10−4 after transmitting the signals through a 10km standard single-mode fiber (SSMF) were well below the 7% hard-decision forward error correction (HD-FEC) threshold of 3.8 × 10−3. In addition, the synthetic transmission scheme proposed in this paper is compared with the traditional 16QAM signal transmission scheme, and the results show that the synthetic transmission scheme outperforms the 16QAM signal transmission scheme.