Filterless Millimeter-Wave Generation with Tunable Tupling Factors using Dual Parallel-MZMs

In the recent times, Millimeter-wave transmission has been considered as a potential solution to conform the present demands of wireless communication. So, optical generation of these mm-waves with tunable multiplication factor is an appealing approach to eliminate the need of high frequency local oscillators (LO) at central stations. This paper highlights a particular scheme of filter less photonic mm-wave generation for wireless transmission with the usage of dual parallel configuration of Mach-Zehnder modulators (MZM). It is demonstrated that by appropriate adjustment of MZM biasing points, modulation index values and providing the particular phase shifts, multiple tupling factors of 2, 4, 6, 8, 10 and 12 can be successfully achieved with just one configuration. The results obtained are discussed and validated with the help of theoretical analysis and computer simulations. The omission of optical filtering largely eliminates various constraints associated with high frequency generation. The parallel MZMs structure's compactness and potential to attain tunable frequency multiplications makes it appropriate for high frequency transmission in diverse RoF networks.