Optical Generation of 60 GHz Downstream Data in Radio over Fiber Systems Based on Two Parallel Dual-Drive MZMs

摘要

This work proposes an easy-implement quadruple-frequency optical carrier suppression millimeter-wave (OCS-MMW) generation scheme for the generation and transmission of a 2.5 Gbps downlink data stream in a Radio over Fiber (RoF) system, based two commercially Dual-Drive Mach?Zehnder Modulator (DD-MZM). Theoretical analysis for back-to-back (B-T-B) transmission and optical fiber transmission is conducted. Simulation experiments are implemented and verified by our theoretical analysis and good agreement is achieved. Simulation results show that a 60 GHz MMW signal can be generated from a 15 GHz radio frequency (RF) oscillator with an optical sideband suppression ratio (OSSR) up to 39 dB and an radio frequency spurious suppression ratio (RFSSRR) exceeding 35dB when the extinction ratios (ERs) of the two parallel DD-MZM is 30dB. The transmission performance of the generated OCS MMW signal is investigated by referring to the eye pattern and bit-error-rate (BER) curve. The eye pattern is clearly opened even when the optical MMW signal is transmitted over 50km.