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Group delay measurement in single-mode fibers with true picosecond resolution using double optical modulation

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2 Author(s)
Thevenaz, L. ; Group of Appl. Phys., Geneva Univ., Switzerland ; Pellaux, J.-P.

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

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Lightwave Technology, Journal of  (Volume:6 ,  Issue: 10 )