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A new pulse-shaping circuit has been designed to increase the performances of large signal modulation of light emitting diodes. It is simply based on a parallel Schottky-capacitance circuit in series with the light emitter. The peak power of the generated optical pulse is shown to be significantly improved compared to the classical resistance-capacitance peaking circuit for sub-nanosecond pulsewidths.
In this paper we investigate the spectroscopic performance of bismuth-doped silica glass at temperature from 10 K to room temperature to identify the nature of the luminescent centre and to understand its fluorescence dynamics. Performing low temperature measurements we show that the near infrared luminescence spread over at least three emission bands centered at 1050, 1260 and 1430 nm when pumped...
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