Results 31 to 40 of about 734,125 (345)
Quantum Noise and Superluminal Propagation [PDF]
, 2000 Causal "superluminal" effects have recently been observed and discussed in various contexts. The question arises whether such effects could be observed with extremely weak pulses, and what would prevent the observation of an "optical tachyon." Aharonov ...
A. M. Steinberg +18 more
core +2 more sources
An Ultracompact OSNR Monitor Based on an Integrated Silicon Microdisk Resonator
IEEE Photonics Journal, 2012 Optical signal-to-noise ratio (OSNR) monitoring is essential for control and management of dynamic optical networks. Small footprint, low cost, and less power consumption are always desirable for such monitoring system.
Ke Xu +6 more
doaj +1 more source
Scattering-lens based quantum imaging beyond shot noise
Scientific Reports, 2021 The scheme of optical imaging using scattering lens can provide a resolution beyond the classical optical diffraction limit with a coherent-state input.
Dong Li, Yao Yao
doaj +1 more source
Anomalous Hydrogen Recombination-Line Ratios in Ultraluminous Infrared Galaxies [PDF]
, 2021 We conducted systematic observations of the H I Br$\alpha$ (4.05 $\mu$m) and Br$\beta$ (2.63 $\mu$m) lines in 52 nearby ($z<0.3$) ultraluminous infrared galaxies (ULIRGs) with AKARI. Among 33 ULIRGs wherein the lines are detected, three galaxies show anomalous Br$\beta$/Br$\alpha$ line ratios ($\sim1.0$), which are significantly higher than those for ...
arxiv +1 more source
IEEE Photonics Journal, 2019 We propose and experimentally demonstrate a photonic millimeter-wave frequency divider based on a super-harmonic injection-locked optoelectronic oscillator (OEO) and an optical frequency comb.
Yongchi Xu +7 more
doaj +1 more source
Signal-to-noise ratio analysis of computational distributed fiber-optic sensing
Optics Express, 2020 In this work, we analyze the signal-to-noise ratio of the computational distributed fiber-optic sensing technique via differential ghost imaging in the time domain using the illumination pattern of Walsh-Hadamard sequences instead of random sequences.
Dayong Shu +5 more
openaire +3 more sources
Electronics Letters, 2022 It is known that 80% power effective data segmentation with Airy and Gaussian point spread functions (PSFs) for 2D imaging achieves sufficient Fisher information and is appropriate to define signal‐to‐noise ratio (SNR) of a data frame.
Mingyan Sun, Yi Sun
doaj +1 more source
Study on the signal-to-noise ratio of Brillouin optical-time domain analyzers
Optics Express, 2020 The signal-to-noise ratio (SNR) of Brillouin optical time-domain analyzers (BOTDA) is modelled and experimentally validated, using direct detection with and without the use of optical pre-amplification. The behavior of SNR as a function of the Brillouin gain and the probe power reaching the photo detection is analyzed in depth using this developed ...
Sheng Wang +3 more
openaire +2 more sources
Optical Labels Enabled Optical Performance Monitoring in WDM Systems
Photonics, 2022 Optical performance monitoring (OPM), particularly the optical power and optical signal-to-noise ratio (OSNR) of each wavelength channel, are of great importance and significance and need to be implemented to ensure stable and efficient operation ...
Tao Yang +6 more
doaj +1 more source
Weak value amplification in a shot-noise limited interferometer [PDF]
, 2012 We study the weak-value amplification (WVA) in a phase measurement with an optical interferometer in which shot noise limits the sensitivity. We compute the signal and the shot noise including the full-order interaction terms of the WVA, and show that ...
Atsushi Nishizawa +3 more
core +2 more sources