The investigation of the nonlinear dynamics of a semiconductor laser based on nonlinear optical loop mirror (NOLM) feedback using Ge doped optical fiber was carried out experimentally. Animations of compilations of the output power as a function of time series and phase plane with effects of optical feedback level, carrier current and modulation signal strength are demonstrated as a tool to giv...

This paper describes an oversampling data recovery circuit composed of an analog delay locked loop and a digital decision logic. The novel oversampling technique is based on the delay locked loop circuit locked to multiple clock periods rather than a single clock period, which generates the timing resolution less than the gate delay of the delay chain. The digital logic for data recovery was im...

This paper presents a small signal stability analysis to assess the issues facing PV (photovoltaic) inverters connected weak grid. It is revealed that cause of transient instabilities, either high-frequency or low-frequency oscillations, dominated by outer control loops and grid strength. However, most challenging oscillations are induced coupling interaction between loop controller PLL (Phase-...

issue of the stimulation of charge-pump phase-locked loops for built-in self-test applications. It is shown that three nodes of the PLL qualify for test signal injection. The hardware and methodology for each are discussed. In particular, a comprehensive explanation of the use of delta-sigma modulation in the time domain is provided. Furthermore, implementation issues of analog tests with signa...

Grid converters synchronized by phase-locked loops (PLLs) could suffer from stability problems, especially being connected to a weak grid or high penetration of converters. The existing literature assesses the paralleled PLL-synchronized at same point common coupling (PCC) using identical control and system parameters. However, in an actual grid, parameters are normally different due manufactur...