Title :
OTDR performance enhancement using a quaternary FSK modulated probe and coherent detection
Author :
Sumida, Masatoyo
Author_Institution :
NTT Opt. Network Syst. Lab, Yokosuka, Japan
fDate :
3/1/1995 12:00:00 AM
Abstract :
This letter proposes a new approach to enhance the performance of optical time domain reflectometry (OTDR). This approach employs a probe signal modulated in a quaternary frequency-shift-keying (FSK) format and a coherent detection technique. Experiments show that the proposed approach reduces the measurement time to one fourth without sacrificing dynamic range and spatial resolution on a 1100-km-long transmission line with optical amplifiers.<>
Keywords :
fibre lasers; frequency shift keying; light coherence; optical fibre communication; optical fibre testing; optical modulation; optical time-domain reflectometry; 1100 km; FSK; OTDR performance enhancement; coherent detection; coherent detection technique; dynamic range; measurement time; optical amplifiers; optical time domain reflectometry; probe signal; quaternary FSK modulated probe; quaternary frequency-shift-keying; spatial resolution; transmission line; Dynamic range; Frequency shift keying; Optical modulation; Probes; Reflectometry; Semiconductor optical amplifiers; Spatial resolution; Stimulated emission; Time measurement; Transmission line measurements;
Journal_Title :
Photonics Technology Letters, IEEE
