Title :
COTDR performance optimization for amplified transmission systems
Author :
Gautheron, O. ; Leroy, J.B. ; Marmier, P.
Author_Institution :
Alcatel Submarine Network, La Ville du Bois, France
fDate :
7/1/1997 12:00:00 AM
Abstract :
Two different cross-coupling schemes that allow coherent optical time-domain reflectometry (COTDR) on an amplified transmission system have been tested. A COTDR dynamic range of 109 km (56 km) with a coupling between the upstream repeater output to the downstream repeater input (output) has been demonstrated on a 900-km test-bed, When the data are launched in both directions at the same wavelength, the impact of the coherent Rayleigh noise on the transmission has been evaluated. The penalty is negligible if a high speed polarization scrambling is used and the launched power per wavelength is kept below +2 dBm.
Keywords :
Rayleigh scattering; backscatter; fibre lasers; optical fibre communication; optical fibre couplers; optical fibre polarisation; optical noise; optical repeaters; optical time-domain reflectometry; optimisation; 109 km; 56 km; 900 km; COTDR dynamic range; COTDR performance optimization; amplified transmission system; amplified transmission systems; coherent Rayleigh noise; coherent optical time-domain reflectometry; cross-coupling schemes; downstream repeater input; high speed polarization scrambling; launched power; upstream repeater output; Couplings; Dynamic range; High speed optical techniques; Optimization; Polarization; Reflectometry; Repeaters; Stimulated emission; System testing; Time domain analysis;
Journal_Title :
Photonics Technology Letters, IEEE
