KM3NeT broadcast optical data transport system

The optical data transport system of the KM3NeT neutrino telescope at the bottom of the Mediterranean Sea will provide more than 6000 optical modules in the detector arrays with a point-to-point optical connection to the control stations onshore. The ARCA and ORCA detectors of KM3NeT are being installed at a depth of about 3500 m and 2500 m,...

Atmospheric neutrinos with the first detection units of KM3NeT/ARCA

The KM3NeT Collaboration is constructing two deep-sea Cherenkov detectors in the Mediterranean Sea, aiming at neutrino oscillation measurements with the ORCA array, while the ARCA array aims at neutrino astronomy in the TeV range. In April 2021, 5 additional detection units were deployed in the ARCA site. The KM3NeT/ARCA instrumented volume is...

Optical characterization of infrared telluride glass fibers for space use

Selenium modified GeTe₄ based glasses optical fibers for far-infrared sensing

This study reports on the synthesis of telluride glasses that have transmission far beyond the second atmospheric window and are stable enough toward crystallisation to be drawn into optical fiber. These glasses are based on the GeTe₄ initial composition which has been stabilized by the introduction of few percents of Se and a...

Telluride glass step index fiber for the far infrared

Nulling interferometry is an important technique under development for the DARWIN planet finding mission which enables the detection of the weak infrared emission lines of an orbiting planet. This technique requires the use of single mode optical fibers transmitting light as far as possible in the infrared. Tellurium based glasses transmit...

Te-rich Ge-Te-Se glass for the CO2 infrared detection at 15 μm

Te80-xGe20Sex glasses have been prepared along the GeSe4-GeTe4 axis using the classical method in silica tube under vacuum. A phase separation domain appears for composition around Te40Ge20Se40. Our attention was turned toward the Te-rich compositions corresponding to 1 < x < 5 at.%. These glasses are transparent from 4 to about 20 μm without...

Impedance Matching of a Micromesh Bolometer Placed in a Silicon Parallel Plate Waveguide Spectrometer

Micromesh bolometers have been used in several instruments working in the submillimeter band (e.g. [1]). The bolometers are usually placed inside a waveguide and consist of a mesh absorber, at a certain distance from a back short. The mesh is made of SiNi whose thermal conductivity is tuned to the incident power and operating temperature. The...

Photonic chip for steering a four element phased array antenna

A polarization independent photonic integrated circuit for phase steering of a four element phased array antenna has been fabricated on InP. The chip is extremely small and suitable for packaging