METHOD FOR MEASURING SKEW OF TAPE-SHAPED OPTICAL FIBER

摘要

PROBLEM TO BE SOLVED: To provide a method for highly accurately measuring a skew of a tape-shaped optical fiber. SOLUTION: A sine wave modulation light is passed through each optical fiber of a tape-shaped optical fiber. A phaseθof the sine wave modulation light propagating each optical fiber is measured. A light propagation time at each optical fiber of the tape-shaped optical fiber is calculated from the measured phase. A skew of the tape-shaped optical fiber is thus measured according to the method. In the method, the phase is measured for a plurality of sine wave frequencies (f), and a proportional relation 6 between the frequency and phase is obtained from phases 5 to the measured plurality of sine wave frequencies. The light propagation time of each optical fiber of the tape-shaped optical fiber is calculated from a proportional constant, whereby the skew of the tape- shaped optical fiber is measured.