Results 11 to 20 of about 2,119 (199)

Fully integrated electrically driven optical frequency comb at communication wavelength. [PDF]

Nanophotonics, 2022
Abstract To meet the high demand of data transmission capacity, optical communications systems have been developed. In order to increase the channel numbers for larger communication bandwidth, multi‐mode lasers and laser arrays can be used. As an alternative coherent light source, optical frequency comb (OFC) contains multi‐wavelength signal, and hence
Li N, Chen G, Lim LW, Ho CP, Xue J, Fu YH, Lee LYT.   +6 more
europepmc   +2 more sources

High-Q asymmetrically cladded silicon nitride 1D photonic crystals cavities and hybrid external cavity lasers for sensing in air and liquids. [PDF]

Nanophotonics, 2022
Abstract In this paper we show a novel design of high Q‐factor silicon nitride (SiN) 1D photonic crystal (PhC) cavities side‐coupled to curved waveguides, operating with both silica and air cladding. The engineering of the etched 1D PhC cavity sidewalls angle allows for high Q‐factors over a wide range of upper cladding compositions, and the ...
Iadanza S, Mendoza-Castro JH, Oliveira T, Butler SM, Tedesco A, Giannino G, Lendl B, Grande M, O'Faolain L.   +8 more
europepmc   +2 more sources

Responsiveness to left-prefrontal tDCS varies according to arousal levels. [PDF]

Eur J Neurosci, 2022
tDCS inconsistent findings may be due to the interplay between the level of induced cortical excitability and unaccounted state‐dependent functional factors. We aimed at verifying whether the behavioural effects induced by a common tDCS montage were influenced by the participants' arousal levels.
Esposito M, Ferrari C, Fracassi C, Miniussi C, Brignani D.   +4 more
europepmc   +2 more sources

Research on the modulation format of 40Gb/s WDM-PON system [PDF]

MATEC Web of Conferences, 2022
In order to meet the transmission needs of WDM-PON system, a WDM-PON full-duplex system based on reflective semiconductor optical amplifier (RSOA) remodulation was constructed in this paper.
Wang Yilin, Zhang Chunlei
doaj   +1 more source

Discretely Tunable (2594, 2629, 2670 nm) GaSb/Si3N4 Hybrid Laser for Multiwavelength Spectroscopy

Laser &Photonics Reviews, Volume 17, Issue 12, December 2023., 2023
A discretely tunable GaSb/Si3N4 hybrid photonic integrated circuit (PIC) laser is introduced for multiwavelength spectroscopy of CO2, H2S, and H2O. It emits mW‐level power at 2670.42, 2629.12, and 2594.27 nm. Wavelength tuning and switching are based on a novel architecture employing cascaded Mach–Zehnder interferometers and a distributed Bragg, which ...
Samu‐Pekka Ojanen, Jukka Viheriälä, Nouman Zia, Eero Koivusalo, Joonas Hilska, Heidi Tuorila, Mircea Guina   +6 more
wiley   +1 more source

Widely Tunable (2.47–2.64 µm) Hybrid Laser Based on GaSb/GaInAsSb Quantum‐Wells and a Low‐Loss Si3N4 Photonic Integrated Circuit

Laser &Photonics Reviews, Volume 17, Issue 7, July 2023., 2023
A miniaturized high‐performance integrated laser exhibiting broad wavelength tuneability near a 2.6 µm wavelength region is demonstrated. The laser consists of a Si3N4 photonic integrated circuit incorporating a tunable reflector and a AlGaInAsSb/GaSb quantum‐well gain element.
Samu‐Pekka Ojanen, Jukka Viheriälä, Nouman Zia, Eero Koivusalo, Joonas Hilska, Heidi Tuorila, Mircea Guina   +6 more
wiley   +1 more source

Chip‐based optical frequency combs for high‐capacity optical communications

Nanophotonics, Volume 10, Issue 5, Page 1367-1385, March 2021., 2021
Abstract Current fibre optic communication systems owe their high‐capacity abilities to the wavelength‐division multiplexing (WDM) technique, which combines data channels running on different wavelengths, and most often requires many individual lasers.
Hao Hu, Leif K. Oxenløwe
wiley   +1 more source

Distinctions in source regions and formation mechanisms of secondary aerosol in Beijing from summer to winter [PDF]

Atmospheric Chemistry and Physics, 2019
To investigate the sources and evolution of haze pollution in different seasons, long-term (from 15 August to 4 December 2015) variations in chemical composition of PM1 were characterized in Beijing, China.
J. Duan, J. Duan, J. Duan, R.-J. Huang, R.-J. Huang, C. Lin, C. Lin, C. Lin, W. Dai, W. Dai, M. Wang, M. Wang, M. Wang, Y. Gu, Y. Gu, Y. Gu, Y. Wang, Y. Wang, Y. Wang, H. Zhong, H. Zhong, H. Zhong, Y. Zheng, H. Ni, H. Ni, H. Ni, H. Ni, U. Dusek, Y. Chen, Y. Li, Q. Chen, D. R. Worsnop, C. D. O'Dowd, J. Cao, J. Cao   +34 more
doaj   +1 more source

On Directly Modulated Reflective Semiconductor Optical Amplifier with Assistance of Birefringent Fiber Loop

Photonics, 2022
Reflective Semiconductor Optical Amplifiers (RSOAs) are essential devices for the development of new generation networks that rely on the convergence of optical and RF communications.
Fokion N. Karadimoglou, Kyriakos E. Zoiros, Zoe V. Rizou, Antonios Hatziefremidis   +3 more
doaj   +1 more source

Performance analysis of a directly modulated semiconductor optical amplifiers using non‐return‐to‐zero, duobinary and quaternary pulse amplitude modulation signalling

IET Optoelectronics, Volume 15, Issue 1, Page 8-19, February 2021., 2021
ABSTRACT Numerical investigation was done for the response of two semiconductor optical amplifiers (SOA) to direct modulation using three of the most commonly employed intensity modulation formats: non‐return‐to‐zero (NRZ), duobinary (DB) and quaternary pulse amplitude modulation (PAM‐4).
Ramón Gutiérrez‐Castrejón, Osvaldo Fernández‐Segura, Pablo Torres‐Ferrera, Daniel Enrique Ceballos‐Herrera   +3 more
wiley   +1 more source