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Rayleigh scatter measurements of a 42 km single-mode fibre at 1.55 ¿m wavelength using an LD and an LN2 cooled Ge-PIN detector

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2 Author(s)
Fujise, M. ; KDD Laboratories, Tokyo, Japan ; Kuwazuru, M.

A 42 km single-mode fibre has been observed by an OTDR at 1.55 ¿m 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.

Published in:

Electronics Letters  (Volume:20 ,  Issue: 6 )