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Analog link

Up to now, we have studied an analog transmission scheme using direct modulation of distributed feedback (DFB) laser diodes with frequency modulation of several carriers which are multiplexed (FDM). We tested two systems, a 3-channel multiplexing prototype built by IDREL, coupled to a wide-band ORTEL optical link and a THOMSON 4-channel prototype.

Using the available cable we are now constructing the transmission system of eight PMT signals using direct modulation and a simple method of mixing, without RF multiplexing.

Jean-Philippe Laugier
Fri Oct 31 11:48:44 MET 1997