Conference paper

High resolution time domain reflectometry for optical components

A Nd:YAG pumped dye laser emitting light pulses of 0.3 ps width, is used as source for a high resolution optical time domain reflectometer. The operating wavelength is tunable around 1.3 μm and suitable for measurements on structures for applications in the telecommunication sector. The system allows one to resolve two scattering centers separated by less than 15 μm in a GaAs structure. A crosscorrelator is used as detection system and offers a dynamic range of 75 dB by using a lock-in-amplifier technique. This sensitivity allows one to investigate defects in active and passive integrated optical devices


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