Rayleigh scatter measurements of a 42 km single-mode fibre at 1.55 μm wavelength using an LD and an LN 2 cooled Ge-PIN detector
- 15 March 1984
- journal article
- Published by Institution of Engineering and Technology (IET) in Electronics Letters
- Vol. 20 (6) , 232-233
- https://doi.org/10.1049/el:19840156
Abstract
A 42 km single-mode fibre has been observed by an OTDR at 1.55 μm wavelength utilising a semiconductor laser and a Ge-PIN photodiode cooled to 77 K with liquid nitrogen together with a feedback resistor of a transimpedance amplifier. The dark current and the thermal noise have been drastically decreased.Keywords
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