Abstract
In this work, a full-duplex time and wavelength division multiplexing-passive optical network (TWDM-PON) system is analysed. Orthogonal frequency division multiplexing (OFDM) with m-quadrature amplitude modulation (m-QAM) is employed to improve the performance of TWDM-PON for downstream and upstream transmission. Simultaneously, multi-color (390–750 nm) laser diodes (LDs) are employed for visible light communication (VLC) using various VLC links to encourage the information rate of fiber/VLC optical network. A TWDM-PON utilizing 16-, 32- and 64-QAM OFDM with ten LDs based VLC system has been analysed for full-duplex multi-color VLC signals of the system. The impact of the LDs input current and high transmission rate in the proposed PON/VLC link has been investigated for m-QAM OFDM modulation. The results show that the 40/40 Gbps 16-, 32- and 64-QAM signals over ten 8000 m VLC links and a 50 km fiber link are successfully transmitted at the modulation input current of 9 mA under bit error rate (BER) of 3.8 × 10–3. Also, the proposed system employing 16-, 32- and 64-QAM signals over a 10 km fiber and ten 10 m VLC links provide the maximum transmission rate of 120, 100 and 80 Gbps respectively. Moreover, the measured error vector magnitudes (EVMs) and calculated BER values for 16-QAM downstream and upstream signals, are well below the required FEC limit than high-order modulation formats. Further, the numerical analysis of the proposed system reveals the superiority of the proposed fiber/VLC links.
Highlights
In this 21st century, the high-capacity requirements for optical networks are rising exponentially due to the rise in recent technology such as big-data analysis, cloud computing and 4k/8k video broadcast
There are still major issues like channel correlation, hardware impairments and implementations, modulation and interference management which need to be address for future based wireless systems (Lu et al 2014). Besides this the integrated power line communication (PLC)-visible light communication (VLC) system act as an economical and efficient backbone network but it has some issues like low transmission speed, disturbance sensitivity, channels’ cross-modulation, nonlinear distortions, huge size and high cost of inductors as well as capacitors utilized in PLC system (Fusheng et al 2016)
This section describes the performance analysis of the proposed passive optical networks (PONs)/VLC link for a single downstream OFDM (1596.8 nm) and a single upstream OFDM (1533.4 nm) signal where each signal consists of ten different color VLC links
Summary
In this 21st century, the high-capacity requirements for optical networks are rising exponentially due to the rise in recent technology such as big-data analysis, cloud computing and 4k/8k video broadcast. There are still major issues like channel correlation, hardware impairments and implementations, modulation and interference management which need to be address for future based wireless systems (Lu et al 2014) Besides this the integrated power line communication (PLC)-VLC system act as an economical and efficient backbone network but it has some issues like low transmission speed, disturbance sensitivity, channels’ cross-modulation, nonlinear distortions, huge size and high cost of inductors as well as capacitors utilized in PLC system (Fusheng et al 2016). J. et al (Shi et al 2018), demonstrated the successful transmission at 3.2 Gbps information rate in OFDM/offset QAM (OFDM/OQAM) on the basics of VLLC-WDM system over 50 km wired and 4.5 m VLLC links These fiber-VLLC systems using a single LD are applicable for short range access networks at low transmission rate.
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