We present recent studies on the impact of atmospheric turbulence on free-space links using either synchronous or nonsynchronous detection. We compare options for atmospheric compensation, including phase compensation and diversity combining techniques. We consider the effects of log-normal amplitude fluctuations and Gaussian phase fluctuations, in addition to local oscillator shot noise, for b...

We present a model for describing the combined presence of nematic and 'smectic' or stripe-like orders seen in recent scanning tunneling microscopy (STM) experiments on cuprates. The smectic order is treated as an electronic charge density wave with an associated Peierls distortion or a 'Pomeranchuk wave'. This primary order is restricted to nanoscale domains by disorder effects, while the seco...

We present a post-distortion linearization technique for semiconductor optical amplifier Mach-Zehnder interferometer (SOA-MZI) photonic sampler. The sampling source is an active mode-locked laser producing 12.6 ps-width pulses with repetition frequency of 10 GHz. mathematical model the presented and then evaluated quasi-static regime, i.e. continuous-wave signals, dynamic sinusoidal signals. A ...

Abstract The system is based on digital signal processing technology, takes MSP432P401R single-chip microcomputer as the main controller, uses on-board ADC to convert input into a signal, and then carries out FFT transformation obtain amplitude of each harmonic component, so carry spectrum analysis calculate THD/ THD o / Δ values for further processing. realizes calculation distortion measureme...

One of the challenges in numerical simulation of wave–turbulence interaction is the precise setup and maintenance of wave and turbulence fields. In this paper, we investigate techniques for the generation and suppression of specific surface wave modes, the generation of turbulence in an inhomogeneous physical domain with a wavy boundary-fitted grid, and the generation and maintenance of waves a...

Abstract We have investigated the waveform distortion of energetic particle driven off-axis fishbone mode (OFM) in tokamak plasmas with kinetic magnetohydrodynamic (MHD) hybrid simulations. extended our previous simulations (Li et al 2022 Nucl. Fusion 62 026013) by considering higher-n harmonics MHD fluid, where n is toroidal number. The successfully reproduced simulation for both magnetic fluc...