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Length dependence of LP11 Mode Cutoff And Its Influence On The Chromatic Dispersion Measurement By Phase Shift Method

The length dependence of LP11 mode cutoff wavelength and its influence on the chromatic dispersion measurement by phase shift method is investigated both theoretically and experimentally. The effective cutoff wavelength λce decreases linearly in a logarithmic scale of fiber length as fiber length increases. Based on the length dependence of λce, the error in the chromatic dispersion measurement of a single-mode fiber by phase shift method is analyzed, which operates at wavelengths including those shorter than the cutoff wave-length. It is clarified that the measurement error for a 200 m-length fiber with a longer cutoff wavelength of 1.35 μm is less than 0.1 ps/km/nm.