A. Karle et al., ANALOG OPTICAL-TRANSMISSION OF FAST PHOTOMULTIPLIER PULSES OVER DISTANCES OF 2-KM, Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment, 387(1-2), 1997, pp. 274-277
New LED transmitters have been used to develop a new method of fast an
alog transmission of PMT pulses over large distances. The transmitters
, consisting basically of InGaAsP LEDs with the maximum emission of li
ght at 1300 nm, allow the transmission of fast photomultiplier pulses
over distances of more than 2 km. The shape of the photomultiplier pul
ses is maintained, with an attenuation less than 1 dB/km. Typical appl
ications of analog optical signal transmission are surface air shower
detectors and under water/ice neutrino experiments, which measure fast
Cherenkov or scintillator pulses at large detector distances to the c
entral DAQ system.