Optical Generation of 60 GHz Downstream Data in Radio over Fiber Systems Based on Two Parallel Dual-Drive MZMs
In this paper, the authors 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 their 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 a Radio Frequency Spurious Suppression Ratio (RFSSRR) exceeding 35dB when the Extinction Ratios (ERs) of the two parallel DD-MZM is 30dB.