Numerical analysis of circular core shaped photonic crystal fiber for orbital angular momentum with efficient transmissi
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Numerical analysis of circular core shaped photonic crystal fiber for orbital angular momentum with efficient transmission Md. Mehedi Hassan1 · Md. Anowar Kabir1 · Md. Nadim Hossain1 · Truong Khang Nguyen4,5 · Bikash Kumar Paul1,2,3 · Kawsar Ahmed1,2 · Vigneswaran Dhasarathan4,5 Received: 20 March 2020 / Accepted: 29 July 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract In this paper, a circular core shaped photonic crystal fiber (PCF) is proposed and the optical propagation characteristics are investigated and simulated by applying the finite element method (FEM) with the help of COMSOL Multiphysics software. The cladding of this PCF is composed of fused silica including a large center air-hole. The simulation process is performed within 1000–2000 nm wavelength. The raised PCF supports up to 38 OAM modes with larger bandwidth (1000 nm) as well as flat dispersion variations. The refractive index difference can exceed 10−4 for each OAM mode. The confinement loss of this PCF remains low approximately around 10−9 to 10−8 dB/m, comparatively better the nonlinearity, the numerical aperture, and the dispersion variation evolves into smoother. So, all these optimizing optical properties prove that our designed PCF is a promising candidate for the OAM mode transmission and other relevant optical communications.
1 Introduction In the twenty-first century, communication technology is developed rapidly by photonic crystal fiber (PCF). In this era of communication technology, time-division multiplexing (TDM), dense mode-division multiplexing (DMDM), and space division multiplexing (SDM) are developed and enriched with increasing the capacity of transmission. But the SDM is a popular and attractive method to overcome the capacity limit of optical communication [1, 2]. Orbital angular momentum (OAM) is a promising candidate for the * Vigneswaran Dhasarathan [email protected] 1
Department of Information and Communication Technology, Mawlana Bhashani Science and Technology University, Santosh, Tangail 1902, Bangladesh
2
Group of Bio‑photomatiχ, Mawlana Bhashani Science and Technology University, Santosh, Tangail 1902, Bangladesh
3
Department of Software Engineering, Daffodil International University, Sukrabad, Dhanmondi, Dhaka 1207, Bangladesh
4
Division of Computational Physics, Institute for Computational Science, Ton Duc Thang University, Ho Chi Minh City, Vietnam
5
Faculty of Electrical and Electronics Engineering, Ton Duc Thang University, Ho Chi Minh City, Vietnam
SDM [3]. It provides some important features to improve fiber communication strategy. In 1992, the OAM techniques of optics were widely recognized by Allen via Lager Gaussian beams at first [4]. The OAM beams have two ordinary characteristics of eddy wavefront and rounded field power distribution. It is expressed by e(il𝜑) . Where, l (….., − 3, − 2, − 1, 0, + 1, + 2, + 3,.….) is the topological accusation and φ is the angle of azimuth [5]. Recently, the OAM beams are generated by some strategy. This method
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