Evaluation of a high-speed hybrid OAM-OFDM-MDM multiplexed coherent FSO system under desert conditions

IF 0.7 4区物理与天体物理 Q4 OPTICS

Optica Applicata Pub Date : 2023-01-01 DOI:10.37190/oa230308

Shivaji Sinha, Chakresh Kumar

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引用次数: 0

Abstract

To meet the needs of future wireless optical networks, this paper introduces a high-speed, hybrid multiplexed, coherent free-space optical (FSO) communication system that integrates an orbital angular momentum (OAM) multiplexed signal with an orthogonal frequency division multiplexing (OFDM) technique. Two independent QAM polarized beams, each carrying in-phase and quadrature (I/Q) phase 16-QAM-OFDM modulated data, are combined using mode division multiplexing (MDM) to increase the capacity of the proposed system. The reason of choosing OFDM is its capability to support higher data rate, and mitigating intersymbol interference (ISI). The signal is detected using a coherent detection-based digital signal processing (DSP) algorithm at the receiver end. The proposed hybrid FSO system is evaluated in low and heavy dust environments using bit error rate (BER), link distance, optical signal-to-noise ratio (OSNR), and received optical power performance matrices. The simulation results demonstrate the successful transmission of a 120 Gb/s single carrier over the longest link ranges of 1.5 and 0.40 km, respectively, under low and heavy dust weather environments below the signal degradation threshold value (forward error correction (FEC) limit) of BER 2.2 × 10 –3 in strong turbulent conditions.

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沙漠条件下高速混合OAM-OFDM-MDM复用相干FSO系统的评估

为了满足未来无线光网络的需求，本文介绍了一种将轨道角动量(OAM)复用信号与正交频分复用(OFDM)技术相结合的高速混合复用相干自由空间光通信系统。两个独立的QAM极化波束，各自携带同相和正交(I/Q)相位16-QAM-OFDM调制数据，使用模分复用(MDM)进行组合以增加所提出系统的容量。选择OFDM的原因是它能够支持更高的数据速率，并且能够减轻码间干扰(ISI)。在接收端使用基于相干检测的数字信号处理(DSP)算法检测信号。采用误码率(BER)、链路距离、光信噪比(OSNR)和接收光功率性能矩阵对混合FSO系统在低粉尘和重粉尘环境下的性能进行了评估。仿真结果表明，在强湍流条件下，在低尘和重尘天气环境下，在低于信号退化阈值(前向纠错(FEC)限制)BER 2.2 × 10 -3的情况下，120 Gb/s单载波在1.5 km和0.40 km的最长链路距离上成功传输。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Optica Applicata 物理-光学

CiteScore

1.00

自引率

16.70%

发文量

审稿时长

4 months

期刊介绍： Acoustooptics, atmospheric and ocean optics, atomic and molecular optics, coherence and statistical optics, biooptics, colorimetry, diffraction and gratings, ellipsometry and polarimetry, fiber optics and optical communication, Fourier optics, holography, integrated optics, lasers and their applications, light detectors, light and electron beams, light sources, liquid crystals, medical optics, metamaterials, microoptics, nonlinear optics, optical and electron microscopy, optical computing, optical design and fabrication, optical imaging, optical instrumentation, optical materials, optical measurements, optical modulation, optical properties of solids and thin films, optical sensing, optical systems and their elements, optical trapping, optometry, photoelasticity, photonic crystals, photonic crystal fibers, photonic devices, physical optics, quantum optics, slow and fast light, spectroscopy, storage and processing of optical information, ultrafast optics.