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Optical Signal Processing Technologies for Communication, Computing, and Sensing Applications
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Optical Signal Processing Technologies for Communication, Computing, and Sensing Applications

A special issue of Sensors (ISSN 1424-8220). This special issue belongs to the section "Communications".

Deadline for manuscript submissions: closed (31 December 2022) | Viewed by 27062

Printed Edition Available!
A printed edition of this Special Issue is available here.

Special Issue Editors

Prof. Dr. Jiangbing Du

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Guest Editor
State Key Laboratory of Advanced Optical Communication Systems and Networks, Shanghai Jiao Tong University, Shanghai 200240, China
Interests: optical communications; optical signal processing; photonic integration
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Yang Yue

E-Mail Website
Guest Editor
School of Information and Communications Engineering, Xi'an Jiaotong University, Xi'an 710049, China
Interests: intelligent photonics; optical communications; optical perception; optical chip
Special Issues, Collections and Topics in MDPI journals
Dr. Jian Zhao

E-Mail Website
Guest Editor
School of Precision Instruments and Optoelectronics Engineering, Tianjin University, Tianjin 300000, China
Interests: linear optical communication systems; performance monitoring techniques for optical networks; integrated fiber devices for optical communication; novel fiber design; digital signal processing techniques in fiber-optic communication systems; few-mode microwave photonics
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Yan-ge Liu

E-Mail Website
Guest Editor
Institute of Modern Optics, Nankai University, Tianjin 300071, China
Interests: micro/nanostructured optical fiber devices; optical fiber communication and sensing technology; optical fiber lasers and amplifiers

Special Issue Information

Dear Colleagues,

Optical technology is one of the key technologies that have been widely used for communication and sensing. By utilizing different degrees of freedom of the photon, signals can be detected and processed in different dimensions including amplitude, phase, time, frequency, LP mode, OAM mode, and so on. Multidimensional signal processing technologies have thus been broadly studied for improving the performance of communication, computing, or even sensing systems.

This Special Issue will explore enabling technologies of signal processing methods for optical communication, optical computing, and optical sensing. Digital, electrical, and optical signal processing theories, integrated chips, devices, subsystems/systems, as well as future perspectives are all within the scope. Topics of interest include, but are not limited to, the following areas:

  • MDM/SDM signal processing methods and devices
  • WDM/TDM signal processing methods and devices
  • Optical AI: optical neural networking, neuromorphic 
  • Digital signal processing for sensing and communication
  • Optical computing
  • Ultrafast optics
  • Nonlinear optics
  • Microwave photonics
  • Integrated signal processing circuits: photonics and electronics
  • Optical processing for 3D/AR/VR
  • Optoelectronic signal processing devices

Prof. Dr. Jiangbing Du
Prof. Dr. Yang Yue
Dr. Jian Zhao
Prof. Dr. Yan-ge Liu
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Sensors is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Digital signal processing
  • Mode division multiplexing
  • Space division multiplexing
  • Wavelength division multiplexing
  • Time-division multiplexing
  • Optical neural networking
  • Optical neuromorphic
  • Optical computing
  • Microwave photonics
  • Ultrafast optics
  • Nonlinear optics
  • Integrated photonics
  • Optoelectronics
  • Optical fiber and device
  • 3D/AR/VR

Published Papers (11 papers)

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Editorial

Jump to: Research, Review

2 pages, 177 KiB  
Editorial
Editorial: Special Issue “Optical Signal Processing Technologies for Communication, Computing, and Sensing Applications”
by Jiangbing Du, Yang Yue, Jian Zhao and Yange Liu
Sensors 2023, 23(5), 2606; https://0-doi-org.brum.beds.ac.uk/10.3390/s23052606 - 27 Feb 2023
Viewed by 1002
Abstract
Optical technology is one of the key technologies that have been widely used for communication, computing and sensing [...] Full article
(This article belongs to the Special Issue Optical Signal Processing Technologies for Communication, Computing, and Sensing Applications)

Research

Jump to: Editorial, Review

8 pages, 5002 KiB  
Article
Nonlinear Distortion by Stimulated Brillouin Scattering in Kramers-Kronig Receiver Based Optical Transmission
by Yuzhu Zhu, Jiangbing Du, Weihong Shen and Zuyuan He
Sensors 2022, 22(19), 7287; https://0-doi-org.brum.beds.ac.uk/10.3390/s22197287 - 26 Sep 2022
Cited by 1 | Viewed by 1130
Abstract
Nonlinear distortion for single-sideband (SSB) signals will significantly reduce the performance of Kramers–Kronig (KK) receiver-based optical transmission. In this work, we present a proof-of-concept study of stimulated Brillouin scattering (SBS)-induced nonlinear distortion for 10 Gbaud and 28 Gbaud SSB QAM16 transmission over 80 [...] Read more.
Nonlinear distortion for single-sideband (SSB) signals will significantly reduce the performance of Kramers–Kronig (KK) receiver-based optical transmission. In this work, we present a proof-of-concept study of stimulated Brillouin scattering (SBS)-induced nonlinear distortion for 10 Gbaud and 28 Gbaud SSB QAM16 transmission over 80 km standard single mode fiber (SSMF) based on a KK receiver. Significantly reduced bit error rate (BER) has been experimentally observed due to the SBS and the threshold of SBS at about 7 dBm is detected for such an 80 km SSMF link. With left sideband (LSB) modulation of SSB, together with optical filtering, reduced SBS nonlinear distortion has been achieved with ~2 dB power tolerance improvement. The results reveal an important issue of SBS-induced nonlinear distortion, which would be of great significance for KK receiver-based optical transmission applications. Full article
(This article belongs to the Special Issue Optical Signal Processing Technologies for Communication, Computing, and Sensing Applications)
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11 pages, 4061 KiB  
Article
Over-Two-Octave Supercontinuum Generation of Light-Carrying Orbital Angular Momentum in Germania-Doped Ring-Core Fiber
by Jian Yang, Yingning Wang, Yuxi Fang, Wenpu Geng, Wenqian Zhao, Changjing Bao, Yongxiong Ren, Zhi Wang, Yange Liu, Zhongqi Pan and Yang Yue
Sensors 2022, 22(17), 6699; https://0-doi-org.brum.beds.ac.uk/10.3390/s22176699 - 05 Sep 2022
Cited by 3 | Viewed by 1903
Abstract
In this paper, we design a silica-cladded Germania-doped ring-core fiber (RCF) that supports orbital angular momentum (OAM) modes. By optimizing the fiber structure parameters, the RCF possesses a near-zero flat dispersion with a total variation of <±30 ps/nm/km over 1770 nm bandwidth from [...] Read more.
In this paper, we design a silica-cladded Germania-doped ring-core fiber (RCF) that supports orbital angular momentum (OAM) modes. By optimizing the fiber structure parameters, the RCF possesses a near-zero flat dispersion with a total variation of <±30 ps/nm/km over 1770 nm bandwidth from 1040 to 2810 nm for the OAM1,1 mode. A beyond-two-octave supercontinuum spectrum of the OAM1,1 mode is generated numerically by launching a 40 fs 120 kW pulse train centered at 1400 nm into a 12 cm long designed 50 mol% Ge-doped fiber, which covers 2130 nm bandwidth from 630 nm to 2760 nm at −40 dB of power level. This design can serve as an efficient way to extend the spectral coverage of beams carrying OAM modes for various applications. Full article
(This article belongs to the Special Issue Optical Signal Processing Technologies for Communication, Computing, and Sensing Applications)
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11 pages, 3816 KiB  
Article
Bandwidth Extension in a Mid-Link Optical Phase Conjugation
by Paweł Rosa, Giuseppe Rizzelli Martella and Mingming Tan
Sensors 2022, 22(17), 6385; https://0-doi-org.brum.beds.ac.uk/10.3390/s22176385 - 24 Aug 2022
Cited by 2 | Viewed by 1116
Abstract
In this paper, we investigate various designs of distributed Raman amplifier (DRA) to extend amplification bandwidth in mid-link optical phase conjugation (OPC) systems and compare bands 191–197 THz and 192–198 THz giving a total bandwidth of 6 THz using a single wavelength pump. [...] Read more.
In this paper, we investigate various designs of distributed Raman amplifier (DRA) to extend amplification bandwidth in mid-link optical phase conjugation (OPC) systems and compare bands 191–197 THz and 192–198 THz giving a total bandwidth of 6 THz using a single wavelength pump. We demonstrate the use of highly reflective fiber Bragg grating (FBG) to minimize gain variation across a WDM grid by optimizing forward and backward pump powers as well as the wavelength of FBGs for original and conjugated channels. Finally, we also simulate OSNR and Kerr nonlinear reduction as a product of signals asymmetry and nonlinear phase shift (NPS) for all channels. Full article
(This article belongs to the Special Issue Optical Signal Processing Technologies for Communication, Computing, and Sensing Applications)
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21 pages, 1077 KiB  
Article
Performance Analysis of a Vertical FSO Link with Energy Harvesting Strategy
by Carmen Álvarez-Roa, María Álvarez-Roa, Francisco J. Martín-Vega, Miguel Castillo-Vázquez, Thiago Raddo and Antonio Jurado-Navas
Sensors 2022, 22(15), 5684; https://0-doi-org.brum.beds.ac.uk/10.3390/s22155684 - 29 Jul 2022
Cited by 5 | Viewed by 1941
Abstract
In this paper we investigate the application of free space optical (FSO) communications, energy harvesting, and unmanned aerial vehicles (UAVs) as key technology enablers of a cost-efficient backhaul/fronthaul framework for 5G and beyond (5G+) networks. This novel approach is motivated by several facts. [...] Read more.
In this paper we investigate the application of free space optical (FSO) communications, energy harvesting, and unmanned aerial vehicles (UAVs) as key technology enablers of a cost-efficient backhaul/fronthaul framework for 5G and beyond (5G+) networks. This novel approach is motivated by several facts. First, the UAVs, acting as relay nodes, represent an easy-to-deploy and adaptive network that can provide line-of-sight between the base stations and the gateways connected to the core network. Second, FSO communications offer high data rates between the UAVs and the network nodes, while avoiding any potential interference with the 5G radio access networks. Third, energy harvesting in the optical domain has the potential to extend the UAVs’ battery life. Nevertheless, the presence of atmospheric turbulence, atmospheric attenuation, and pointing errors in the FSO links severely degrades their performance. For this reason an accurate yet tractable modelling framework is required to fully understand whether an UAV-FSO backhaul/fronthaul network with energy harvesting can be applied. To this end, we consider a composite channel attenuation model that includes the effect of turbulence fading, pointing errors, and atmospheric attenuation. Using this model, we derive analytical closed-form expressions of the average harvested energy as a function of the FSO link parameters. These expressions can be used to improve energy harvesting efficiency in FSO link design. We have applied our proposed expressions to evaluate the energy harvested in vertical FSO links for a variety of real scenarios under a modified on-off keying (OOK) scheme optimized for energy harvesting. From the simulations carried out in this paper, we demonstrate that significant values of harvested energy can be obtained. Such performance enhancement can complement the existing deployment charging stations. Full article
(This article belongs to the Special Issue Optical Signal Processing Technologies for Communication, Computing, and Sensing Applications)
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16 pages, 765 KiB  
Article
Matched Filtering for MIMO Coherent Optical Communications with Mode-Dependent Loss Channels
by Luis M. Torres, Francisco J. Cañete and Luis Díez
Sensors 2022, 22(3), 798; https://0-doi-org.brum.beds.ac.uk/10.3390/s22030798 - 21 Jan 2022
Cited by 3 | Viewed by 2129
Abstract
The use of digital signal processors (DSP) to equalize coherent optical communication systems based on spatial division multiplexing (SDM) techniques is widespread in current optical receivers. However, most of DSP implementation approaches found in the literature assume a negligible mode-dependent loss (MDL). This [...] Read more.
The use of digital signal processors (DSP) to equalize coherent optical communication systems based on spatial division multiplexing (SDM) techniques is widespread in current optical receivers. However, most of DSP implementation approaches found in the literature assume a negligible mode-dependent loss (MDL). This paper is focused on the linear multiple-input multiple-output (MIMO) receiver designed to optimize the minimum mean square error (MMSE) for a coherent SDM optical communication system, without previous assumptions on receiver oversampling or analog front-end realizations. The influence of the roll-off factor of a generic pulse-amplitude modulation (PAM) transmitter on system performance is studied as well. As a main result of the proposed approach, the ability of a simple match filter (MF) based MIMO receiver to completely eliminate inter-symbol interference (ISI) and crosstalk for SDM systems under the assumption of negligible MDL is demonstrated. The performance of the linear MIMO fractionally-spaced equalizer (FSE) receiver for an SDM system with a MDL-impaired channel is then evaluated by numerical simulations using novel system performance indicators, in the form of signal to noise and distortion ratio (SNDR) loss, with respect to the case without MDL. System performance improvements by increasing the transmitter roll-off factor are also quantified. Full article
(This article belongs to the Special Issue Optical Signal Processing Technologies for Communication, Computing, and Sensing Applications)
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13 pages, 2627 KiB  
Article
Low-Complexity Robust Adaptive Beamforming Based on INCM Reconstruction via Subspace Projection
by Yanliang Duan, Xinhua Yu, Lirong Mei and Weiping Cao
Sensors 2021, 21(23), 7783; https://0-doi-org.brum.beds.ac.uk/10.3390/s21237783 - 23 Nov 2021
Cited by 3 | Viewed by 1383
Abstract
Adaptive beamforming is sensitive to steering vector (SV) and covariance matrix mismatches, especially when the signal of interest (SOI) component exists in the training sequence. In this paper, we present a low-complexity robust adaptive beamforming (RAB) method based on an interference–noise covariance matrix [...] Read more.
Adaptive beamforming is sensitive to steering vector (SV) and covariance matrix mismatches, especially when the signal of interest (SOI) component exists in the training sequence. In this paper, we present a low-complexity robust adaptive beamforming (RAB) method based on an interference–noise covariance matrix (INCM) reconstruction and SOI SV estimation. First, the proposed method employs the minimum mean square error criterion to construct the blocking matrix. Then, the projection matrix is obtained by projecting the blocking matrix onto the signal subspace of the sample covariance matrix (SCM). The INCM is reconstructed by replacing part of the eigenvector columns of the SCM with the corresponding eigenvectors of the projection matrix. On the other hand, the SOI SV is estimated via the iterative mismatch approximation method. The proposed method only needs to know the priori-knowledge of the array geometry and angular region where the SOI is located. The simulation results showed that the proposed method can deal with multiple types of mismatches, while taking into account both low complexity and high robustness. Full article
(This article belongs to the Special Issue Optical Signal Processing Technologies for Communication, Computing, and Sensing Applications)
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14 pages, 4087 KiB  
Article
Efficient Design for Integrated Photonic Waveguides with Agile Dispersion
by Zhaonian Wang, Jiangbing Du, Weihong Shen, Jiacheng Liu and Zuyuan He
Sensors 2021, 21(19), 6651; https://0-doi-org.brum.beds.ac.uk/10.3390/s21196651 - 07 Oct 2021
Cited by 6 | Viewed by 1939
Abstract
Chromatic dispersion engineering of photonic waveguide is of great importance for Photonic Integrated Circuit in broad applications, including on-chip CD compensation, supercontinuum generation, Kerr-comb generation, micro resonator and mode-locked laser. Linear propagation behavior and nonlinear effects of the light wave can be manipulated [...] Read more.
Chromatic dispersion engineering of photonic waveguide is of great importance for Photonic Integrated Circuit in broad applications, including on-chip CD compensation, supercontinuum generation, Kerr-comb generation, micro resonator and mode-locked laser. Linear propagation behavior and nonlinear effects of the light wave can be manipulated by engineering CD, in order to manipulate the temporal shape and frequency spectrum. Therefore, agile shapes of dispersion profiles, including typically wideband flat dispersion, are highly desired among various applications. In this study, we demonstrate a novel method for agile dispersion engineering of integrated photonic waveguide. Based on a horizontal double-slot structure, we obtained agile dispersion shapes, including broadband low dispersion, constant dispersion and slope-maintained linear dispersion. The proposed inverse design method is objectively-motivated and automation-supported. Dispersion in the range of 0–1.5 ps/(nm·km) for 861-nm bandwidth has been achieved, which shows superior performance for broadband low dispersion. Numerical simulation of the Kerr frequency comb was carried out utilizing the obtained dispersion shapes and a comb spectrum for 1068-nm bandwidth with a 20-dB power variation was generated. Significant potential for integrated photonic design automation can be expected. Full article
(This article belongs to the Special Issue Optical Signal Processing Technologies for Communication, Computing, and Sensing Applications)
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7 pages, 1698 KiB  
Communication
Raman Amplification Optimization in Short-Reach High Data Rate Coherent Transmission Systems
by Mingming Tan, Md Asif Iqbal, Tu T. Nguyen, Paweł Rosa, Lukasz Krzczanowicz, Ian. D. Phillips, Paul Harper and Wladek Forysiak
Sensors 2021, 21(19), 6521; https://0-doi-org.brum.beds.ac.uk/10.3390/s21196521 - 29 Sep 2021
Cited by 8 | Viewed by 2487
Abstract
We compared the transmission performances of 600 Gbit/s PM-64QAM WDM signals over 75.6 km of single-mode fibre (SMF) using EDFA, discrete Raman, hybrid Raman/EDFA, and first-order or second-order (dual-order) distributed Raman amplifiers. Our numerical simulations and experimental results showed that the simple first-order [...] Read more.
We compared the transmission performances of 600 Gbit/s PM-64QAM WDM signals over 75.6 km of single-mode fibre (SMF) using EDFA, discrete Raman, hybrid Raman/EDFA, and first-order or second-order (dual-order) distributed Raman amplifiers. Our numerical simulations and experimental results showed that the simple first-order distributed Raman scheme with backward pumping delivered the best transmission performance among all the schemes, notably better than the expected second-order Raman scheme, which gave a flatter signal power variation along the fibre. Using the first-order backward Raman pumping scheme demonstrated a better balance between the ASE noise and fibre nonlinearity and gave an optimal transmission performance over a relatively short distance of 75 km SMF. Full article
(This article belongs to the Special Issue Optical Signal Processing Technologies for Communication, Computing, and Sensing Applications)
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Review

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18 pages, 8701 KiB  
Review
Distributed Raman Amplification for Fiber Nonlinearity Compensation in a Mid-Link Optical Phase Conjugation System
by Mingming Tan, Paweł Rosa, Tu T. Nguyen, Mohammad A. Z. Al-Khateeb, Md. Asif Iqbal, Tianhua Xu, Feng Wen, Juan D. Ania-Castañón and Andrew D. Ellis
Sensors 2022, 22(3), 758; https://0-doi-org.brum.beds.ac.uk/10.3390/s22030758 - 19 Jan 2022
Cited by 12 | Viewed by 2689
Abstract
In this paper, we review different designs of distributed Raman amplifiers which have been proposed to minimize the signal power profile asymmetry in mid-link optical phase conjugation systems. We demonstrate how the symmetrical signal power profiles along the fiber can be achieved using [...] Read more.
In this paper, we review different designs of distributed Raman amplifiers which have been proposed to minimize the signal power profile asymmetry in mid-link optical phase conjugation systems. We demonstrate how the symmetrical signal power profiles along the fiber can be achieved using various distributed Raman amplification techniques in the single-span and more realistic multi-span circumstances. In addition, we show the theoretically predicted results of the Kerr nonlinear product reduction with different Raman techniques in mid-link optical phase conjugator systems, and then in-line/long-haul transmission performance using numerical simulations. Full article
(This article belongs to the Special Issue Optical Signal Processing Technologies for Communication, Computing, and Sensing Applications)
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30 pages, 33088 KiB  
Review
A Review: Point Cloud-Based 3D Human Joints Estimation
by Tianxu Xu, Dong An, Yuetong Jia and Yang Yue
Sensors 2021, 21(5), 1684; https://0-doi-org.brum.beds.ac.uk/10.3390/s21051684 - 01 Mar 2021
Cited by 26 | Viewed by 6503
Abstract
Joint estimation of the human body is suitable for many fields such as human–computer interaction, autonomous driving, video analysis and virtual reality. Although many depth-based researches have been classified and generalized in previous review or survey papers, the point cloud-based pose estimation of [...] Read more.
Joint estimation of the human body is suitable for many fields such as human–computer interaction, autonomous driving, video analysis and virtual reality. Although many depth-based researches have been classified and generalized in previous review or survey papers, the point cloud-based pose estimation of human body is still difficult due to the disorder and rotation invariance of the point cloud. In this review, we summarize the recent development on the point cloud-based pose estimation of the human body. The existing works are divided into three categories based on their working principles, including template-based method, feature-based method and machine learning-based method. Especially, the significant works are highlighted with a detailed introduction to analyze their characteristics and limitations. The widely used datasets in the field are summarized, and quantitative comparisons are provided for the representative methods. Moreover, this review helps further understand the pertinent applications in many frontier research directions. Finally, we conclude the challenges involved and problems to be solved in future researches. Full article
(This article belongs to the Special Issue Optical Signal Processing Technologies for Communication, Computing, and Sensing Applications)
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