Investigation of chromatic dispersion effect on 802.16 WiMax over long haul transmission distances

We present a novel FTTH based access network architecture that integrates the wireless and wired services in a converged provision with dynamic bandwidth allocation. A wide range of interactive multimedia services are available to end-users by using latest-generation, OFDM based wireless technologies. Direct VCSEL modulation with 16QAM and 64QAM OFDM based WiMax signal (3.5 GHz) was modeled by using VPItransmissionMaker for upstream transmission by investigating the error vector magnitudes (EVMs). WiMax over standard single mode fibre (SSMF) is first examined and maximum limit stated in current standard of IEEE 802.16 WiMAX using 16QAM (EVM of -24.43 dB) and 64QAM (EVM of -30.4 dB) are achieved at 110km and 95 km respectively. For the second part of the analysis, dispersion compensating fiber (DCF) is deployed in order to achieve long haul transmission distances. A maximum achievable distance of 600km and 450km was realized with -27.6 dB EVM results after dispersion compensation technique applied to both 16QAM and 64QAM OFDM based WiMax respectively.