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A Novel Fibre Relative Length Measurement System Based on Phase Modulation Optical Linkage
Q-Y Ye and C. Yang

A novel fibre relative length measurement system is proposed for the first time. It is based on measuring the gain free spectrum range of a phase modulation interferometric detection optical link with a network analyser. Theory analysis and experimental results all indicate that the least fibre relative length can be measured is 0.005 m with the existed the 40 GHz vector network analyser. In addition, it is a simple structure, easy operation and fast system for precise fibre relative length direct measure.

Keywords: Phase modulation optical link, relative length measurement, fibre, free spectrum range, Mach-Zehnder interferometer (MZI)

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