Comparative study of multiplexing technic s DHT - OFDM and DFT - OFDM for IM / DD optical link

International Journal of Computer and Information Technology (ISSN: 2279 – 0764) Volume 03 – Issue 03, May 2014 Comparative study of multiplexing technics DHT- OFDM and DFT-OFDM for IM / DD optical link Patrick Sotindjo Leopold Djogbe LETIA - Departement GIT-EPAC LETIA - Departement GIT-EPAC University of Abomey-Calavi University of Abomey-Calavi Abomey-calavi, Benin Abomey-calavi, Benin patrick.sotindjo {at} epac.uac.bj 01BP 2009 01BP 2009 symbols to be transmitted come from a real constellation for the generating of orthogonal subcarriers [3]. Abstract — This document makes a comparison between two techniques for generating orthogonal subcarriers named DFT The objective of this work is to make a comparative study (Discrete Fourier Transform) and DHT (Discrete Hartley of these two methods of generating subcarriers. The encoding Transform) for the implementation of OFDM (Orthogonal technique used is the NRZ (Non Return to Zero) which Frequency Division Multiplexing) in an IM / DD (Intensity guarantees real symbols after modulation. Modulated Direct Detection) optical link. Two variants of OFDM have been identified in this work’s context; ACO-OFDM II. MATERIALS AND METHODS (Asymmetrically Clipped Optical OFDM) and DCO-OFDM (DC biased Optical OFDM). To do this, a model of the OFDM A.