Performance Analysis of Various Multiplexing Techniques

Abstract

The effect of optical hybrid sensor based on wavelength division multiplexed technique (WDM) is studied using Photonics crystal fiber and Fiber Bragg Grating (FBG). Full Duplex scheme is used in this system to receive and transmit the data at same time for fast processing. The Finite difference time domain photonics simulation software (FDTD) is helpful in observing the variation in reflection and the transmission power spectra of the photonic gratings. Using line defects we created two linear waveguide, further it is used as optical sensor. The system can be used as in communication filed for data transmission and also used in sensing application to sense the property and deformation of object. Orthogonal Frequency Division Multiplexing (OFDM) uses multicarrier modulation (MCM) in which the digital data are encoded over different lower rate subcarriers. OFDM have various advantages over conventional modulation techniques such as its robustness with respect to the channel dispersion and its simplicity regarding channel and phase approximation in a time-varying atmosphere. Currently various researches have recognized that OFDM is a one of the most prominent and promising technique for optical communications, while its implementation and application in the optical systems is incomprehensive surveillance. The objective of this dissertation is to look into the implementation of different multiplexing transmission techniques and for this purpose Optisystem 14 and OptiFDTD software are being used which helps to design many configurations concerning optical communications. Firstly, we have designed a full duplex wavelength division multiplexed hybrid sensor for different applications. Secondly, we studied Coherent Optical Orthogonal Frequency Division Multiplexing with the help of Dual Polarization QPSK modulation scheme, using coherent detection in optical communication system