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Photonics
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Optical Signal Processing
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Optical Signal Processing

A special issue of Photonics (ISSN 2304-6732). This special issue belongs to the section "Optical Communication and Network".

Deadline for manuscript submissions: closed (30 August 2023) | Viewed by 6352

Special Issue Editors

Dr. Amer Kotb

E-Mail Website
Guest Editor
1. GPL, State Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine Mechanics, and Physics, Chinese Academy of Sciences, Changchun 130033, China
2. Department of Physics, Faculty of Science, University of Fayoum, Fayoum 63514, Egypt
Interests: all-optical signal processing; all-optical signal processing; optical waveguides; optical communications; SOA devices; computational photonics
Prof. Dr. Kyriakos E. Zoiros

E-Mail Website
Guest Editor
Lightwave Communications Research Group, Department of Electrical and Computer Engineering, School of Engineering, Democritus University of Thrace, 67100 Xanthi, Greece
Interests: SOA devices; circuits and subsystems; applications of microring resonators in optical communications; microwave photonics; free-space optical communications
Special Issues, Collections and Topics in MDPI journals
Dr. Santosh Kumar

E-Mail Website
Guest Editor
Shandong Key Laboratory of Optical Communication Science and Technology, School of Physics Science and Information Technology, Liaocheng University, Liaocheng, China
Interests: optical fiber sensors; terahertz sensing and spectroscopy; optical networks and systems; bio-photonics; terahertz and infrared spectroscopy; biophysics; nanotechnolgy & nanoscience; integrated photonics; nonlinear optics; distributed optical sensing
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

All-optical signal processing for application in telecommunication networks has been studied extensively over the last decade because signal processing in the optical domain offers several advantages. Using optical processing means that opto–electrical/electro–optical conversion in the network nodes is unnecessary, which can potentially be more cost-effective. Moreover, the bandwidth of the signal can be significantly larger compared to electrical processing because the optical signal processor can work at higher bit rates. Optical signal processing can use many phenomena and devices to perform certain processing functions. These nonlinear optical processes are, for example, four-wave mixing (FWM), self-phase modulation (SPM), cross-phase modulation (XPM), sum frequency generation (SFG), difference frequency generation (DFG), and second harmonic generation (SHG). Various optical materials and devices can be utilized for optical signal processing, such as highly nonlinear fibers (HNLFs), silicon waveguides, chalcogenide waveguides, periodically poled lithium niobate (PPLN) waveguides, semiconductor optical amplifiers (SOAs), and photonic crystals or photonic crystal fiber.

The field of optical signal processing is broad and multi-disciplinary and draws upon knowledge in fields ranging from, amongst others, physics; materials and devices; communications, signal processing, and information theory; neuroscience; quantum information science; linear and nonlinear science; computing; and ultrafast science. Therefore, Photonics invites manuscript submissions to Optical Signal Processing. Submissions focusing on advancing fundamental knowledge and techniques, as well as applications in diverse areas, from communications to natural and biological sciences, are welcome. This Special Issue aims to provide an overview of ongoing progress and trends in advancing the knowledge, understanding, and novel applications of optical signal processing. Areas of interest include (but are not limited to):

  • Ultrafast optical signal processing;
  • Integration for photonic signal processing;
  • Programmable photonic signal processing;
  • Optical signal processing for sensing and communications;
  • Photonic integrated circuits;
  • Semiconductor devices, including SOAs and sources;
  • Highly nonlinear fibers;
  • Linear and nonlinear material platforms for optical signal processing;
  • Optical switching technologies, concepts, and techniques.

Dr. Amer Kotb
Prof. Dr. Kyriakos E. Zoiros
Dr. Santosh Kumar
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. Photonics is an international peer-reviewed open access monthly 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 2400 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

  • all-optical signal processing
  • photonic integrated circuits
  • semiconductor devices, including SOAs and sources
  • highly nonlinear fibers
  • linear and nonlinear material platforms for optical signal processing
  • optical switching technologies, concepts, and techniques

Published Papers (4 papers)

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Research

12 pages, 1962 KiB  
Communication
A Simplified Volterra Equalizer Based on System Characteristics for Direct Modulation Laser (DML)-Based Intensity Modulation and Direct Detection (IM/DD) Transmission Systems
by Zhongshuai Feng, Na Li, Wei Li, Peili He, Ming Luo, Qianggao Hu, Liyan Huang and Yi Jiang
Photonics 2023, 10(10), 1174; https://doi.org/10.3390/photonics10101174 - 21 Oct 2023
Viewed by 1040
Abstract
The nonlinear Volterra equalizer has been proved to be able to solve the problem of nonlinear distortion, but it has high computational complexity and is difficult to implement. In this paper, a simplified second-order Volterra nonlinear equalizer designed for intensity modulation/direct detection systems [...] Read more.
The nonlinear Volterra equalizer has been proved to be able to solve the problem of nonlinear distortion, but it has high computational complexity and is difficult to implement. In this paper, a simplified second-order Volterra nonlinear equalizer designed for intensity modulation/direct detection systems based on direct modulated laser is proposed and demonstrated, taking into account the characteristics of the system. It has been proved that the received signal of direct modulation laser/direct detection system can be expressed in Volterra series form, but its form is too complex, and the device parameters should also be considered. We re-derived it and obtained a more concise form. At the same time, we proposed a method to simplify the second-order Volterra nonlinear equalizer without relying on device parameters. The performance of the proposed Volterra nonlinear equalizer is evaluated experimentally on a 56 Gb/s 4-ary pulse amplitude modulation link implemented by using a 1.55 µm direct modulation laser. The results show that, compared with the traditional Volterra nonlinear equalizer, the receiver sensitivity of the equalizer is only reduced by 0.2 dB at most, but the complexity can be reduced by 50%; compared with diagonally pruned Volterra nonlinear equalizers, the complexity of the equalizer is the same, but the reception sensitivity can be improved by 0.5 dB. Full article
(This article belongs to the Special Issue Optical Signal Processing)
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14 pages, 14885 KiB  
Communication
2 × 2 Compact Silicon Waveguide-Based Optical Logic Functions at 1.55 μm
by Amer Kotb and Kyriakos E. Zoiros
Photonics 2023, 10(4), 403; https://doi.org/10.3390/photonics10040403 - 03 Apr 2023
Cited by 3 | Viewed by 1221
Abstract
Compact waveguide crossing is a fundamental component of optoelectronic fusion chip solutions due to its orders-of-magnitude smaller footprint than that of conventional photonic integrated circuits. In this paper, we suggest 2 × 2 compact silicon-on-silica waveguides that can implement all of the fundamental [...] Read more.
Compact waveguide crossing is a fundamental component of optoelectronic fusion chip solutions due to its orders-of-magnitude smaller footprint than that of conventional photonic integrated circuits. In this paper, we suggest 2 × 2 compact silicon-on-silica waveguides that can implement all of the fundamental Boolean logic functions, including XOR, AND, OR, NOT, NOR, XNOR, and NAND, operated at 1.55 μm. Three input waveguides, one output waveguide, and a design area compose the proposed waveguide. The execution of the specified logic gates relies on the constructive and destructive interferences produced by the phase variations between the input beams. The contrast ratio (CR) is employed as a performance metric to assess how well these logic functions operate. In comparison to other reported designs, the proposed waveguide achieves higher CRs at a high speed of 120 Gb/s. Full article
(This article belongs to the Special Issue Optical Signal Processing)
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9 pages, 1413 KiB  
Communication
An All Optical 2 × 1 Multiplexer Using a Metal-Insulator-Metal based Plasmonic Waveguide for Processing at a Rapid Pace
by Ipshitha Charles, Sandip Swarnakar, Geetha Rani Nalubolu, Venkatrao Palacharla and Santosh Kumar
Photonics 2023, 10(1), 74; https://doi.org/10.3390/photonics10010074 - 09 Jan 2023
Cited by 5 | Viewed by 1512
Abstract
This study proposes, designs, and simulates a unique plasmonic Y-shaped MIM waveguide based 2 × 1 multiplexer (MUX) structure utilising opti-FDTD software. Two plasmonic Y-shaped waveguides are positioned facing one another inside a minimum wafer size of 6 µm × 3.5 µm in [...] Read more.
This study proposes, designs, and simulates a unique plasmonic Y-shaped MIM waveguide based 2 × 1 multiplexer (MUX) structure utilising opti-FDTD software. Two plasmonic Y-shaped waveguides are positioned facing one another inside a minimum wafer size of 6 µm × 3.5 µm in the 2 × 1 MUX configurations that is being described. The design parameters are adjusted until the plasmonic multiplexer performs as required under optimal conditions. Extinction ratio and insertion loss are two performance metrics that are calculated for performance analysis of the design, which indicate the potential to be applied in plasmonic integrated circuits. Full article
(This article belongs to the Special Issue Optical Signal Processing)
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9 pages, 1710 KiB  
Article
Flexible Method for Generating Arbitrary Vector Beams Based on Modified Off-Axis Interference-Type Hologram Encoding
by Zhiyu Liu, Yiyan Xie, Wenxu Zhu, Qianqian Fu, Feilong Gao, Guoru Li, Yiran Wang, Xiancui Su, Bingyuan Zhang and Santosh Kumar
Photonics 2022, 9(12), 949; https://doi.org/10.3390/photonics9120949 - 08 Dec 2022
Cited by 1 | Viewed by 1424
Abstract
A novel experimental setup for the generation of arbitrary vector beams is proposed. The system major includes two reflective liquid crystal spatial light modulators (RLC-SLM) and a polarizing beam splitting prism. Moreover, this method is not limited by the wavelength of light wave [...] Read more.
A novel experimental setup for the generation of arbitrary vector beams is proposed. The system major includes two reflective liquid crystal spatial light modulators (RLC-SLM) and a polarizing beam splitting prism. Moreover, this method is not limited by the wavelength of light wave and the pixel size of SLM. Theoretical analysis shows that when Gaussian beam or a plane beam is illuminated on a computer-generated hologram (CGH) specially designed in this work, the complex amplitudes of the vector field’s two orthogonal polarization components may be changed by modifying the encoding parameters, resulting in a vector beam with arbitrary complex amplitude and polarization in the output field. The experimental results also show that the two independent coding channels of the device have good polarization-selective imaging ability, which greatly improves the flexibility of generating arbitrary vector beams. Full article
(This article belongs to the Special Issue Optical Signal Processing)
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