A method for mitigating the phase imbalance and insertion loss in the optical mm- wave system for 5G communication network

In this paper, an optical millimeter-wave (mm-wave) generated using a signal Mach Zehnder modulator (MZM) is proposed for a 5G communication network. This paper presents the mitigation process of phase imbalance and the insertion loss of the optical mm-wave signal. In the proposed system, the phase imbalance can be reduced by tuning the phase of the optical mm-wave signal at the optical stage. The best results are obtained when tuning the phase of 5π/12 at the phase shift. From the results, the phase imbalance influences the insertion loss and the amplitude of the mm-wave signal. In this study, the phase imbalance decreased from 0.4° to 0.1°. Mitigating the phase imbalance can lower the phase noise to 0.2°.