Four Wave Mixing Suppression using Optical Phase Conjugation and Band Pass Filter

Abstract

Microcellular systems are getting attention due to ever-increasing data and capacity demands in wireless services. Utmost advantage of microcellular systems is the potential to support high speed because of the many small cells for frequency utilization. However, aforementioned advantages come at the cost of huge investment for installing multiple Base stations (BSs). One the most expensive factor for high cost is the complex channel control in the spectral delivery in BSs and the handoffs. In order to eradicate this limitation, operations performed at BSs should replace and done at the Control Station. Radio over Fiber (RoF) systems supporting high frequency millimetre waves are emerged as a great choice for Fifth generation (5G) broadband communication. Nonlinear and scattering effects are distance and performance limiting and introduce spectrum broadening, pulse broadening and signal Modulation. Wavelength division multiplexed (WDM) system are maximum prone to the Four wave mixing (FWM) performance deteriorating effects and interferences in the intended wavelengths and their power can be lowered by taking wide channel spacings, lower power levels, and optical fiber lower effective area. However, mode efficient technique to suppress the FWM effects is required. In this research work, a RoF system has been proposed with the integration of WDM over 100 km single mode fiber with FWM suppression. Optical phase conjugation (OPC) and Band pass optical filter (BPF) based joint technique has been employed to suppress the FWM Idlers. The results of proposed WDM-RoF system has been evaluated at different input parameters such as input power, WDM channel spacings and number of channels in terms of Output power, FWM, Q factor and Bit error rate (BER). A detailed comparison of Dispersion compensation fiber (DCF)-BPF and proposed OPC-BPF is performed and results revealed That due to midlink spectrum inversion in OPC-BPF, it has improved performance with enhanced FWM suppression and can support high input powers.