Title :
Long-range 1.5 μm OTDR in a single-mode fibre using A D2 gas-in-glass laser (100 km) or a semiconductor laser (60 km)
Author :
Stone, J. ; Chraplyvy, A.R. ; Kasper, B.L.
Author_Institution :
Bell Laboratories, Crawford Hill Laboratory, Holmdel, USA
Abstract :
We have observed Rayleigh backscatter in a single-mode fibre in optical time domain refiectometry at 1.56 μm wavelength to a range of 100 km using a D2 gas-in-glass laser, and to 60 km at 1.53 μm using an injection laser. The low-noise receiver used an InGaAs PIN photodiode and a FET-input operational amplifier with averaging of 1000 times to provide signal/noise enhancement.
Keywords :
Rayleigh scattering; backscatter; measurement by laser beam; optical fibres; optical testing; time-domain reflectometry; 1.53 microns wavelength; 1.56 microns wavelength; D2 gas-in-glass laser; FET input operational amplifier; InGaAs PIN photodiode; Rayleigh backscatter; injection laser; low-noise receiver; optical fibres; optical time domain reflectometry; p-i-n diode; semiconductor laser; single-mode fibre;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19850382
