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September 2011 [Education] Analyze DE-MZMs With Multicarrier RF Inputs Transforming microwave signals into the optical domain and back again is vital to modern high-speed communications systems. Electro-optical modulators (EOMs) play key roles in this process, and the dual-electrode Mach-Zehnder modulator (DE-MZM), which has been used in realizing radio-over-fiber systems, is an attractive candidate for RF/optical systems operating with multiple carriers. The DE-MZM has been used in radio-over-fiber systems employing optical single sideband (OSSB) modulation;... September 2010 [Components] Analyze IMD-Causing Frequency Components Amplifiers based on MOSFET devices can suffer nonlinearities traceable to harmonic signal components. To better understand this phenomenon, an analysis was performed, based on polynomial substations, to identify the signal components that can affect the nonlinear performance of an amplifier operated at relatively high input signal levels. Polynomial substitutions were performed with the Mathematica software from ... August 2010 [Communications] Mach-Zehnder Modulators Serve Radio Over Fiber Millimeter-wave wireless communications networks can take advantage of frequency multiplication schemes that generate high-frequency signals from lower-frequency sources. In one case, frequency multiplication for radio-over-fiber links can be achieved by means of Mach- Zehnder-modulator (MZM) based schemes. With three MZMs biased at their minimum transmission points, and a tunable optical delay line placed between two of the modulators and... September 2009 [Devices & ICs] Modify MOSFET Models For Nonlinear Quantification Scaling silicon CMOS transistors to smaller and smaller dimensions has made them serious competitors to traditional high-frequency transistors in many RF and microwave applications.1 Of course, creating accurate models of these shrinking devices is an important part of modern computer-aided-engineering (CAE) design practices, and linearity is a key issue in these models especially for RF/microwave circuits, not only in high-power... |
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