Results 11 to 20 of about 204 (154)
Fully integrated electrically driven optical frequency comb at communication wavelength [PDF]
Nanophotonics, Volume 11, Issue 13, Page 2989-3006, June 2022., 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
Nanxi Li +6 more
wiley +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, Volume 11, Issue 18, Page 4183-4196, September 2022., 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 ...
Simone Iadanza +8 more
wiley +2 more sources
Responsiveness to left‐prefrontal tDCS varies according to arousal levels [PDF]
European Journal of Neuroscience, Volume 55, Issue 3, Page 762-777, February 2022., 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.
Marco Esposito +4 more
wiley +2 more sources
Hybrid external-cavity lasers (ECL) using photonic wire bonds as coupling elements [PDF]
Scientific Reports, 2021 Combining semiconductor optical amplifiers (SOA) on direct-bandgap III–V substrates with low-loss silicon or silicon-nitride photonic integrated circuits (PIC) has been key to chip-scale external-cavity lasers (ECL) that offer wideband tunability along ...
Yilin Xu +14 more
doaj +2 more sources
Advances in Semiconductor Optical Amplifier Technologies for All-Optical Logic Gate Implementations: A Comprehensive Review [PDF]
NanomaterialsSemiconductor optical amplifiers (SOAs) are central to the development of ultrafast, low-power all-optical signal processing systems. Their strong nonlinear response, compact size, and compatibility with photonic integration platforms make them key ...
Jiali Cui, Kyriakos E. Zoiros, Amer Kotb
doaj +2 more sources
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 +6 more
wiley +1 more source
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 +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
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 +3 more
wiley +1 more source
Applied Sciences, 2021 The radio-over-fiber (RoF) technique has gained a lot of interest recently, as the millimeter-wave signals can be generated and delivered in the optical domain with the advantages of low attenuation, high capacity, and being free from electromagnetic ...
Amare-Mulatie Dehnaw +6 more
doaj +1 more source