Fibre interferometry supported by EDFA amplifier

摘要

In this paper we present our first experiments and results connected with a laser fibre interferometry. Basic set-up of a fibre vibrometer based on interference weak scattered light with a reference beam shows in this case that signals from photodetector are quite small and often it is impossible to detect them correctly. When the fibre interferometer works on the telecommunication wavelength 1550nm it is possibility to use the telecommunication fibre amplifier to gain weak optical signals into levels that are easily detectable.