arXiv subjects

A. V. Masalov

Publications and source records attributed to A. V. Masalov.

2 recordsLinked to original sources

arXiv2025

Sub-Poissonian Light in a Waveguide Kerr-medium

Waveguides on a chip represent a new medium for implementing nonlinear optical transformations of light. Modern $\text{Si}_3\text{N}_4$ chip waveguides are attractive due to their high Kerr nonlinearity, suppressed Brillouin scattering on guided acoustic waves (GAWBS), and lengths up to one meter. The capabilities of waveguides for generating sub-Poissonian light in the form of a displaced Kerr state are analyzed. We offer new analytical formulas for estimating the capabilities of suppressing photon fluctuations of a displaced Kerr state for any value of input light amplitude. The results of numerical calculations are presented. It is shown that the degree of photon noise suppression can reach values of 5 - 15 dB with 100 mW light power in waveguides a few meters long.

quant-ph↗

arXiv2017

Noise spectra in balanced optical detectors based on transimpedance amplifiers

We present a thorough theoretical analysis and experimental study of the shot and electronic noise spectra of a balanced optical detector based on an operational amplifier (OA) connected in a transimpedance scheme. We identify and quantify the primary parameters responsible for the limitations of the circuit, in particular the bandwidth and shot-to-electronic noise clearance. We find that the shot noise spectrum can be made consistent with the second order Butterworth filter, while the electronic noise grows linearly with the second power of the frequency. Good agreement between the theory and experiment is observed, however the capacitances of the operational amplifier input and the photodiodes appear significantly higher than those specified in manufacturers' datasheets. This observation is confirmed by independent tests.

physics.ins-det↗