Abstract
BackgroundAn optical Millimeter Wave (MM-Wave) generation with high frequency multiplication factor is very attractive solution to avoid the use of high frequency local oscillators at the central station. MethodsIn this paper, a frequency 16 tupling technique is demonstrated with the use of four cascaded MZMs. With the proper adjustment of DC bias of the Mach-Zehnder Modulators (MZM), amplitude and phases of the RF Local oscillators, MM-Wave with a frequency 16 times the input RF LO is demonstrated. ResultsThe cascaded structure has resulted very low modulation index of 2.827 and 54 dB and 42 dB of OSSR and RFSSR respectively. Analysis of both optical and RF sided band suppression ratios under non-ideal cases are also simulated and presented. Further, 10 Gbps NRZ data transmission performance over 50 km Single Mode Fiber (SMF) is also evaluated. ConclusionsThe proposed structure can tolerate up to few degrees of non-ideal parameter variation and is very simple to realize.
Highlights
An optical Millimeter Wave (MM-Wave) generation with high frequency multiplication factor is very attractive solution to avoid the use of high frequency local oscillators at the central station
The schematic diagram of the generation of 60GHz milli-meter wave is shown in Fig. 1, which predominantly comprises a laser diode (LD), Mach-Zehnder Modulator (MZM), Standard single mode fiber (SSMF) and photodetector (PD)
A continuous wave (CW) Laser centered at 193.1 THz can be expressed mathematically [23] as EinðtÞ 1⁄4 Ece jωct ð2Þ
Summary
There is a growing demand for the high speed data rate services, but which cannot be supported by existing congested frequency spectrum. To overcome the spectral congestion and support future traffic demands, use of MM-Wave frequency band has been proposed. Optical MM-Wave generation and RoF transmission methods have been. Single MZM cannot provide sufficient flexibility to select and generate the desired higher order optical sidebands and several series parallel configuration have been utilized to achieve high frequency multiplication factors. Hasan et al have utilized array of four phase modulators to generate frequency octupling and 24 tupling [18]. A cascaded combination of four MZMs is utilized to reduce the modulation index and improve the optical and RF sideband suppression ratios.
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