Design and Investigation of High-Capacity Spatial-Division Multiplexing Network Employing a Multimode Fiber
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Journal of Russian Laser Research, Volume 41, Number 5, September, 2020
DESIGN AND INVESTIGATION OF HIGH-CAPACITY SPATIAL-DIVISION MULTIPLEXING NETWORK EMPLOYING A MULTIMODE FIBER Ashish Malhotra,1∗ Gurmanik Kaur,1 Rakesh Goyal,2 and Monika Rani3 1 Sant
Baba Bhag Singh University Jalandhar, Punjab 144030, India
2 I.
K. Gujral Punjab Technical University Jalandhar, Punjab, India 3 Kanya
Maha Vidyalaya Jalandhar, Punjab, India ∗ Corresponding
author e-mail:
malhotra.gsp @ gmail.com
Abstract In spatial division multiplexing (SDM)-based communication systems, each spatial mode can act as an independent information-bearing carrier capable of scaling the total transmission capacity by several orders of magnitude. It has been reported that in SDM networks the signal amplitude depends upon the optical-path-length (OPL) difference between the various optical modes. In this work, we realize SDM technique using a multimode fiber (MMF), because MMFs have a potential to increase transmission capacity drastically by transmitting signals over large number of modes separately. The system performance is analyzed on the basis of following parameters: visualizer spatial profile, mode index profiles, fiber transfer function, refractive index profile, bit error rate, and quality factor. Also we measure changes in the optical path length due to a phase-shifting laser beam. We conclude that MMFs have huge scope for future ultrahigh-capacity transmission systems employing SDM.
Keywords: spatial division multiplexing (SDM), multimode fiber (MMF), mode division multiplexing (MDM), optical fiber communication (OFC), optical path length (OPL).
1.
Introduction
The acceleration of data traffic and machine-to-machine connections has catalyzed researchers around the globe to look for possible strategies to increase the capacity of optical fiber networks and optimize the available optical spectrum. Spatial-division multiplexing (SDM) is a revolutionary technology, which increases the aggregate data rate by a factor equal to the number of modes that can be precisely generated and demultiplexed. SDM technique has immense potential in telecommunication sector, as it does not put extra load on already crowded spectrum [1]. The use of the spatial structure of the electromagnetic wave is mooted as a potential solution to address the pending capacity crunch. Further, different mode shapes have been proposed to realize SDM in optical communication systems [2]. Due to providing large capacity for long-haul fiber links, SDM network, which can be implemented with multimode fibers, has been paid considerable attention in the literature [3]. In [4], a high-precision arbitrary-mode converter has been proposed for mode-division-multiplexing optical-fiber communication Manuscript submitted by the authors in English on June 4, 2020. c 2020 Springer Science+Business Media, LLC 1071-2836/20/4105-0544 544
Volume 41, Number 5, September, 2020
Journal of Russian Laser Research
systems. A phase-only spatial light modulation based on simulated annealing algorithm is us
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