Abstract:

The DC bias of MachZehnder modulator directly affects the performance of the radiooverfiber link. Considering three RF signal inputs, the model of radiooverfiber link based on singledrive MachZehnder modulator is established, and  the effects of modulator bias on RF gain, noise figure and spurious free dynamic range is analyzed. Simulation results show that, when the DC bias shift is 0.32π, the RF gain is maximum, the noise figure is minimum and the spurious free dynamic range is maximum. At this moment, the performance of radiooverfiber link is optimum.

Key words: radio over fiber system;MachZehnder modulator;DC current bias