Performance Analysis of WDM PON and ROF Technology in Optical Communication Based on FBG

Performance evaluation of various hybrid modulation techniques transmitted by EDFA in radio-over-fibre communication

“…The results show that OQPSK is better in uplink and downlink is comparable over a distance of 50 km on single-mode fibre (Jawla, 2013). Zacharias et al (2016) discussed how Direct and External Intensity Modulation in OFDM ROF Links using a hybrid modulation technique QAM, orthogonal frequency-division multiplexing (OFDM) scheme and compared by using external (Mach-Zehnder (MZM)) modulator and direct (vertical-cavity surface-emitting laser (VCSEL)) modulator which shows that with the external modulation scheme, error vector magnitude (EVM) parameter is better than direct modulation scheme in which EVM gets increased by 8% over a distance of 100 Km (Pandey et al, 2014). Zacharias et al in the paper on 'Direct and External Intensity Modulation in OFDM ROF Links' demonstrated external intensity modulation technique Electro-opto modulator (EOM) and Electro-absorption Modulator (EAM) using orthogonal frequency-division multiplexing (OFDM) scheme compared through variation of 4, 16, 32 bits of QAM-OFDM External Modulation (EOM and EAM) and the effect of Bit error rate of EAM is analyzed.…”

“…In the downlink, radio frequency signals directly modulate with the laser diode using intensity-modulated optical signals at the central station and transmitted through optical fibre to the base station. The extraction of the signals at the base station is done by using a photodiode as demodulator (Pandey, Gupta, & Chaurasiya, 2014). The advantages of radio-over-fibre technology include transparency to bandwidth or modulation techniques, simplicity, small-sized base stations and centralized operation is possible for different wireless services (El-Nahal Fady & Salha Mamoun, 2013).…”

Hybrid OFDM RoF-Based WDM-PON/MMW Backhaul Architecture For Heterogeneous Wireless Networks

“…An attractive alternative is wavelength-division multiplexing PON (WDM-PON), which can provides 1859-378X-2017-3401 c 2017 REV a significant reduction in the number of fibers while supplying a large number of high data-rate channels. On the other hand, radio-over-fiber (RoF) technology, which combines the advantages of the both optical fiber and wireless communications, provides flexibility, long reach, high capacity, low electromagnetic interference, and high immunity to the atmospheric conditions [6,7]. In RoF-based backhaul networks, complex functions such as modulation/demodulation and up/down-conversion to/from RF frequency are located at the CS while optical fibers in capable of providing high data-rate with low loss are used to distribute the data-modulated RF signals from CS to BSs.…”