Downlink High Quality 72 GHz Millimeter

Abstract

This paper investigates the performance of downlink transmission for millimetre wave in radio over a fiber system. Firstly, a high clarity optical 72 GHz millimeter wave signal is generated by using a frequency quadrupling technique based on carrier suppression. The optical carrier suppression ratio of the generated 72 GHz signal is 71 dB. Thus, highly suppression of optical carrier and harmonics lead to obtain high purity millimeter-wave which will decrease suffering from impairment due to fiber dispersion. Then, the performance of a modulated millimeter in downlink data transmission is investigated by using an additional optical modulator. Two different optical modulators are used to compare the performance of achieved mm-wave; Mach Zehnder modulator and Electro Absorption modulator. It is found that the signal when modulated using EAM has better performance than when this done with MZM. The Max Q factor for 80 km are nearly up to 20 when utilizing the former, but just 2.3 when the latter is deployed.