A fast, large dynamic range analog signal transfer system based on optical fibers

Lorenz, E.; Maier, Robert R. J.; Tran, Trong-Hieu; Weissbach, P.

doi:10.1016/s0168-9002(00)01288-2

Cited by 6 publications

(3 citation statements)

References 3 publications

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“…The current signal that passes through the LED is showed in Figure 7. Polarization applied to the LED allows that the LED current to remain into the linear range with the optical power 8 .…”

Section: Transmitter Simulation Resultsmentioning

confidence: 99%

Design, modelling, and testing of electro-optical transmitters for the central pixel of the MAGIC telescope camera

et al. 2005

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In this work we have built an electro-optical system for the transmission of low frequency analogue signals through optical fibre. The main goal was to achieve minimum pulse distortion with maximum dynamic range. The system has been used in the framework of the MAGIC telescope experiment for the transmission of the analogue output from a photo-multiplier dedicated to optical observation of astrophysical objects, in particular pulsars. The received signal polarizes an infrared LED ( =850 nm), which converts the pulse into an optical analogue pulse. The electro-optical pulse is transmitted by means of a multi-mode optic fibre and finally amplified and filtered by the optical receiver. The whole system has been tested using a pulse generator resembling the type of pulsed signal we expect from pulsars, that is with period of about tens of milli-seconds and few milli-seconds wide. The system was calibrated in order to: a) obtain a fixed relation between the received pulse and the final data and b) enhance the dynamic range and low distortion. In what follows, we show the behaviour of the optical transmitter under different pulse shapes, amplitude and frequencies up to several hundred Hz. The electro-optical system has been mounted on the MAGIC telescope and tested successfully with the observation of the pulsed optical signal from the Crab pulsar.

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Section: Transmitter Simulation Resultsmentioning

confidence: 99%

Design, modelling, and testing of electro-optical transmitters for the central pixel of the MAGIC telescope camera

et al. 2005

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“…Optical fibers were chosen for the analog signal transmission between the PMT camera and the counting house because they are lightweight, compact, immune to electro-magnetic pick-up noise and provide no pulse dispersion and attenuation [9]. The signal attenuation at 1 km fiber length is about 2.3 dB for the chosen 850 nm wavelength of the VCSELs.…”

Section: Optical Delays and Splittersmentioning

confidence: 99%

“…The response of the PMTs to sub-ns input light shows a pulse of FWHM of 1.0 -1.2 ns and rise and fall times of 600 and 700 ps correspondingly [8]. By modulating vertical cavity surface emitting laser (VCSEL) diodes in amplitude the ultra-fast analogue signals from the PMTs are transferred via 162m long, multimode graded index 50/125 µm diameter optical fibers to the counting house [9]. After transforming the light back to an electrical signal, the original PMT pulse has a FWHM of about 2.2 ns and rise and fall times of about 1ns.…”

Section: Principle and Signal Processing Of The Magic Telescopementioning

confidence: 99%

Tests of a prototype multiplexed fiber-optic ultra-fast FADC data acquisition system for the MAGIC telescope

Bartko

Göebel

Mirzoyan

et al. 2005

Nuclear Instruments and Methods in Physics Research Section A:

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Ground-based Atmospheric Air Cherenkov Telescopes (ACTs) are successfully used to observe very high energy (VHE) gamma rays from celestial objects. The light of the night sky (LONS) is a strong background for these telescopes. The gamma ray pulses being very short, an ultra-fast read-out of an ACT can minimize the influence of the LONS. This allows one to lower the so-called tail cuts of the shower image and the analysis energy threshold. It could also help to suppress other unwanted backgrounds.Fast 'flash' analog-to-digital converters (FADCs) with GSamples/s are available commercially; they are, however, very expensive and power consuming. Here we present a novel technique of Fiber-Optic Multiplexing which uses a single 2 GSamples/s FADC to digitize 16 read-out channels consecutively. The analog signals are delayed by using optical fibers. The multiplexed (MUX) FADC read-out reduces the cost by about 85% compared to using one ultra-fast FADC per read-out channel.Two prototype multiplexers, each digitizing data from 16 channels, were built and tested. The ultra-fast read-out system will be described and the test results will be reported. The new system will be implemented for the read-out of the 17 m diameter MAGIC telescope camera.

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A temperature-stable optical link for the transmission of fast analogue signals

Rose

Bradbury

2008

Nuclear Instruments and Methods in Physics Research Section A:

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A fast, large dynamic range analog signal transfer system based on optical fibers

Cited by 6 publications

References 3 publications

Design, modelling, and testing of electro-optical transmitters for the central pixel of the MAGIC telescope camera

Design, modelling, and testing of electro-optical transmitters for the central pixel of the MAGIC telescope camera

Tests of a prototype multiplexed fiber-optic ultra-fast FADC data acquisition system for the MAGIC telescope

A temperature-stable optical link for the transmission of fast analogue signals

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