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Photonics
Special Issues
Space Division Multiplexing Techniques
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Space Division Multiplexing Techniques

A special issue of Photonics (ISSN 2304-6732).

Deadline for manuscript submissions: closed (15 July 2024) | Viewed by 4175

Special Issue Editors

Dr. Bin Huang

E-Mail Website
Guest Editor
State Key Laboratory of Solidification Processing, Xidian University, Xi'an, China
Interests: optical device; photonics; fiber communication
Dr. Jing Zhang

E-Mail Website
Guest Editor
School of Optoelectronic Science and Engineeing, University of Electronic Science and Technology of China, Chengdu, China
Interests: integrated optical theory and technology
Dr. Ning Wang

E-Mail Website
Guest Editor
Department of Fundamental Network Technology, China Mobile Research Institute, Beijing, China
Interests: mode-division multiplexed transmission; fiber lasers and amplifiers; nonlinear fiber optics; passive optical networks

Special Issue Information

Dear Colleagues,

Optical fiber communication is the backbone of the telecommunications infrastructure that supports the internet. As internet demand keeps on increasing, the need for a single fiber to carry more information is crucial. It is very important to find smart solutions to increase the capacity x times in a single fiber by increasing the cost much less than x times. Space division multiplexing (SDM) is viewed to be the most promising solution to meet this criterion. SDM techniques can be categorized as multi-mode fiber (MMF)/few-mode fiber (FMF) transmission, uncoupled-core multi-core fiber (MCF) transmission and coupled-core MCF transmission. Great efforts have been made for the improvement of SDM techniques, which includes SDM multiplexers, SDM amplifiers, SDM fibers, SDM signal processing, etc.

Long-haul laboratory transmission experiments have long been verified; however, further improvements are needed for SDM techniques to be feasible for industrial applications (e.g., high-performance devices (coupler, multiplexer, amplifier, switch, etc.), high-quality SDM fibers, stronger nonlinear property advantages than SMF, less signal processing complexity, and so on). In addition, SDM techniques could potentially find applications in some other fields. In distributed fiber sensing applications, SDM techniques can be applied to detect vibration locations over long distances.

We encourage researchers to further explore SDM techniques to make it feasible in industrial techniques. We also encourage new applications of SDM techniques. We encourage researchers to explore issues including, but not limited to:

  • SDM transmission system, including MMF/FMF, uncoupled-core MCF, coupled-core MCF transmission;
  • High-performance SDM devices, including multiplexer, coupler, amplifier, switch, etc.;
  • SDM transmitter and receiver system design;
  • SDM transmission signal processing algorithm and complexity;
  • SDM transmission nonlinearity research;
  • SDM technique applications in fiber sensing and other fields.

Dr. Bin Huang
Dr. Jing Zhang
Dr. Ning Wang
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

  • space division multiplexing
  • few-mode fiber
  • multimode fiber
  • multi-core fiber
  • fiber-based device
  • amplifiers
  • nonlinearity

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Published Papers (3 papers)

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Research

11 pages, 2614 KiB  
Article
The Generation of Equal-Intensity and Multi-Focus Optical Vortices by a Composite Spiral Zone Plate
by Huaping Zang, Jingzhe Li, Chenglong Zheng, Yongzhi Tian, Lai Wei, Quanping Fan, Shaoyi Wang, Chuanke Wang, Juan Xie and Leifeng Cao
Photonics 2024, 11(5), 466; https://doi.org/10.3390/photonics11050466 - 15 May 2024
Viewed by 1249
Abstract
We propose a new vortex lens for producing multiple focused coaxial vortices with approximately equal intensities along the optical axis, termed equal-intensity multi-focus composite spiral zone plates (EMCSZPs). In this typical methodology, two concentric conventional spiral zone plates (SZPs) of different focal lengths [...] Read more.
We propose a new vortex lens for producing multiple focused coaxial vortices with approximately equal intensities along the optical axis, termed equal-intensity multi-focus composite spiral zone plates (EMCSZPs). In this typical methodology, two concentric conventional spiral zone plates (SZPs) of different focal lengths were composited together and the alternate transparent and opaque zones were arranged with specific m-bonacci sequence. Based on the Fresnel–Kirchhoff diffraction theory, the focusing properties of the EMCSZPs were calculated in detail and the corresponding demonstration experiment was been carried out to verify our proposal. The investigations indicate that the EMCSZPs indeed exhibit superior performance, which accords well with our physical design. In addition, the topological charges (TCs) of the multi-focus vortices can be flexibly selected and controlled by optimizing the parameters of the zone plates. These findings which were demonstrated by the performed experiment may open new avenues towards improving the performance of biomedical imaging, quantum computation and optical manipulation. Full article
(This article belongs to the Special Issue Space Division Multiplexing Techniques)
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10 pages, 3166 KiB  
Article
All-Fiber Low-Modal-Crosstalk Demultiplexers for DSP-Free IM/DD LP-Mode MDM Transmission
by Yuyang Gao, Jian Cui, Xian Zhou, Zhangyuan Chen and Juhao Li
Photonics 2024, 11(3), 271; https://doi.org/10.3390/photonics11030271 - 19 Mar 2024
Viewed by 1030
Abstract
Weakly coupled mode-division multiplexing (MDM) techniques supporting intensity modulation and direct detection (IM/DD) transmission are promising methods of enhancing the capacity of short-reach scenarios in which low-modal-crosstalk-mode demultiplexers for degenerate linear polarized (LP) modes are highly desired. In this paper, we review two [...] Read more.
Weakly coupled mode-division multiplexing (MDM) techniques supporting intensity modulation and direct detection (IM/DD) transmission are promising methods of enhancing the capacity of short-reach scenarios in which low-modal-crosstalk-mode demultiplexers for degenerate linear polarized (LP) modes are highly desired. In this paper, we review two degenerate-mode reception schemes. Firstly, a low-modal-crosstalk orthogonal combined reception method for degenerate modes is proposed based on all-fiber mode-selective couplers, in which signals in both degenerate modes are demultiplexed into the LP01 mode of single-mode fibers and then are multiplexed into the mutually orthogonal LP01 and LP11 modes of a two-mode fiber (TMF) for simultaneous detection. Secondly, a novel degenerate-mode-selective coupler consisting of an input few-mode fiber and an output TMF is proposed, which could demultiplex degenerate LP modes without any digital signal processing (DSP). Both demultiplexers are achieved based on the taper and polish process. The fabricated devices are characterized and compared. The results show that the proposed schemes can pave the way to the practical implementation of DSP-free IM/DD LP-mode MDM transmission systems. Full article
(This article belongs to the Special Issue Space Division Multiplexing Techniques)
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7 pages, 2603 KiB  
Communication
Impact of Geometric Input Fibers’ Core Positioning on the Adiabaticity of Photonic Lanterns
by Bin Huang, Meng Li, Hangze Ping, Jiaqi Wang, Xuan Li and Xiaopeng Shao
Photonics 2024, 11(3), 222; https://doi.org/10.3390/photonics11030222 - 29 Feb 2024
Cited by 1 | Viewed by 1115
Abstract
Photonic lantern is a key device in space division multiplexing (SDM) system. The key challenge of a photonic lantern is mode scalability, which requires the taper length to increase nonlinearly as the mode number scales up. The traditional photonic lantern fabrication method requires [...] Read more.
Photonic lantern is a key device in space division multiplexing (SDM) system. The key challenge of a photonic lantern is mode scalability, which requires the taper length to increase nonlinearly as the mode number scales up. The traditional photonic lantern fabrication method requires stacking the input fibers into the hollow, low-index outer cladding before tapering. It implicitly sets geometric constraints on the input fibers’ core positioning. We propose a photonic lantern design with drilling preform and reduced cladding fibers to lift these constraints and make photonic lanterns more adiabatic. By analyzing the effects of loosening the constraints on the adiabatic requirement of a three-mode photonic lantern, we find further progress could be made to alleviate this adiabatic requirement. The optimal structure for our design is proposed and demonstrated through the beam propagation method (BPM). Our findings could help further improve the mode scalability of photonic lanterns. Full article
(This article belongs to the Special Issue Space Division Multiplexing Techniques)
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