Results 51 to 60 of about 734,125 (345)
EPJ Web of Conferences, 2017 A multi-wavelength Brillouin fiber laser with the implementation of reflective fiber Bragg grating is developed. In this ring cavity architecture, the fiber laser system is performed by the stimulated Brillouin scattering effect and four-wave mixing ...
Malek A. Zakiah +5 more
doaj +1 more source
Q-factor monitoring of optical signal-to-noise ratio degradation in optical DPSK transmission [PDF]
Electronics Letters, 2008 An asynchronous sampling monitor for optical DPSK signals by using a two-tap histogram is proposed. By means of statistical analysis, a parameter is defined to measure the Q-factor to indicate the OSNR degradation. Compared to traditional monitoring methods, this method requires no synchronisation before sampling and is thus cost-effective.
Jong, K.-C., Tsao, H.-W., Lee, S.-L.
openaire +3 more sources
Noise in optical synthesis images. I. Ideal Michelson interferometer [PDF]
, 1989 We study the distribution of noise in optical images produced by the aperture synthesis technique, in which the principal source of noise is the intrinsic shot noise of photoelectric detection.
Kulkarni, Shrinivas R., Prasad, Sudhakar
core +1 more source
FEBS Open Bio, EarlyView.The contrast transfer function (CTF) is an imaging aberration that is a major resolution‐limiting factor in cryo‐electron microscopy (cryo‐EM). Precise CTF estimation is key to overcoming this limitation, but is particularly challenging in cryo‐electron tomography (cryo‐ET) data. Here, we present an approach for using geometric information to assist in
Sagar Khavnekar, William Wan
wiley +1 more source
IEEE Photonics Journal, 2015 The signal-to-interference-plus-noise ratio of the noised single-sideband optical orthogonal frequency-division multiplexing (SSB-OOFDM) signal in a direct-detection OFDM system is first deduced theoretically.
Jianxin Ma, Wei Zhou
doaj +1 more source
Compact Optical Counterparts of Ultraluminous X-ray Sources [PDF]
, 2011 Using archival Hubble Space Telescope (HST) imaging data, we report the multiband photometric properties of 13 ultraluminous X-ray sources (ULXs) that have a unique compact optical counterpart. Both magnitude and color variation are detected at time scales of days to years.
arxiv +1 more source
Concentration ratio for a circular trough with flat receiver [PDF]
arXiv, 2022 We present a simple analytical formula for the geometric concentration ratio of a circular trough optical concentrator coupled to a flat (planar) receiver. The receiver is sized to achieve full collection (no spillage) for any combination of acceptance and rim angle.
arxiv
Optical frequency divider with division uncertainty at the 10^(-21) level [PDF]
Natl Sci Rev 2016,, 2016 Optical clocks with unprecedented accuracy of 10^(-18) will lead to innovations in many research areas. All the applications of optical clocks rely on the ability of precisely converting the frequency from one optical clock to another, or particularly to the frequencies in the fiber telecom band for long-distance transmission.
arxiv +1 more source
Journal of Applied Clinical Medical Physics, EarlyView.Abstract Background The aim of this study was to thoroughly analyze the reproducibility of radiomics feature extraction across three Image Biomarker Standardization Initiative (IBSI)‐compliant platforms using a digital phantom for benchmarking. It uncovers high consistency among common features while also pointing out the necessity for standardization ...
Han‐Back Shin +5 more
wiley +1 more source
SensorsHyperspectral detection of the change rate of organic matter content in agricultural remote sensing requires a high signal-to-noise ratio (SNR). However, due to the large number and efficiency limitation of the components, it is difficult to improve the ...
Jize Fan +7 more
doaj +1 more source