Performance evaluation and enhancement of the modified OOK based IM/DD techniques for hybrid fiber/FSO communication ove
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Performance evaluation and enhancement of the modified OOK based IM/DD techniques for hybrid fiber/FSO communication over WDM‑PON systems Ebrahim E. Elsayed1 · Bedir B. Yousif2 Received: 28 February 2020 / Accepted: 31 July 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract In this paper, we have studied the performance evaluation and enhancement of a wavelength-division-multiplexing (WDM) for the passive optical network (PON) in the hybrid fiber/free-space optical (HFFSO) communication system using the modified on–off keying (OOK) based intensity modulation and direct detection (IM/DD) techniques. This work describes the design and analysis of the 8-channels WDM based on the PON-HFFSO transmission system at 2.5 Gbps under different atmospheric turbulence (AT) conditions. Inter-channel crosstalk (ICC), fluctuation, amplified spontaneous emission noise, AT, and impairments are investigated in the paper. A hybrid fiber/WDM-FSO over the PON structure using IM/DD and OOK significantly improves reliability link and accessibility as well as data rate, also improves the system capacity; hence the proposed model will reduce power consumption while maintaining system efficiency. Both impairments and ICC are investigated here and the results are presented in the form of bit-error-rate (BER), transmission distances, the required optical power, and electrical signal-to-noise ratios (SNRs). The system uses the modified OOK based on IM/DD to implement adaptive and electrical SNRs detection thresholds. Numerical results show that the SNR gap between the electrical-SNR-optimized detection system and adaptive detection system is 2.2 dB and 4.2 dB at a BER of 10−5 without a state offset ξ = 0 and ξ = 0.21, respectively. The proposed model enhances performance in terms of BER and electrical SNRs. An improvement in the power penalty of 2.0–4.0 dB at a BER of 1 0−12 can be potentially achieved using the modified OOK technique when impaired by the weak turbulence. Keywords Atmospheric turbulence (AT) · Hybrid fiber/free-space optical (HFFSO) communications · Wavelength-division-multiplexing (WDM) system · Modified on–off keying (OOK) · Inter-channel crosstalk (ICC) · IM/DD techniques
* Ebrahim E. Elsayed [email protected] 1
Department of Electronics and Communications Engineering, Faculty of Engineering, Mansoura University, Mansoura, El‑Dakahlia 35516, Egypt
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Department of Electronics and Communications Engineering, Faculty of Engineering, Kafrelsheikh University, Kafrelsheikh, Kafrelsheikh 33511, Egypt
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E. E. Elsayed, B. B. Yousif
1 Introduction Although linking communication with the free-space optical (FSO) spectrum instead of the radio frequency (RF) one allows ignoring license requirements, improving security, and transmitting data onto the broad spectrum (Chan 2006; Shapiro and Harney 2012; Ciaramella et al. 2009; Li et al. 2007; Yang et al. 2016; Aladeloba et al. 2013; Vecchi et al. 2008; Wang et al. 2011; Elsayed et al. 2018). It s
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