Title :
Group delay measurement in single-mode fibers with true picosecond resolution using double optical modulation
Author :
Thévenaz, Luc ; Pellaux, Jean-Paul
Author_Institution :
Group of Appl. Phys., Geneva Univ., Switzerland
fDate :
10/1/1988 12:00:00 AM
Abstract :
Highly accurate group delay measurements in long single-mode fibers were achieved over the full 1200-1600 nm spectral range by measuring phase shifts of a modulated lightwave. The high modulation frequency is shifted down to the kilohertz range using a second optical modulation at the fiber output end, so that low-frequency, ultrasensitive detection and phase measurement can be performed with high-frequency resolution conserved. This results in extremely reliable measurements with a <1-ps resolution using a fully remote light source such as an LED or even a halogen lamp
Keywords :
optical fibres; optical modulation; optical testing; 1200 to 1600 nm; LED; double optical modulation; group delay measurements; halogen lamp; phase measurement; phase shifts; picosecond resolution; remote light source; single-mode fibers; Delay; Frequency modulation; Light sources; Optical modulation; Performance evaluation; Phase detection; Phase frequency detector; Phase measurement; Phase modulation; Ultraviolet sources;
Journal_Title :
Lightwave Technology, Journal of