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The apparatus according to the invention comprises a coupler (30) intended to couple between each other two monomode fibres presenting four branches (31, 32, 33, 34). The branch (31) is connected to a branch (36). The branch (33) is the reference fibre and forms with a converging optics (39) and a plane mirror (41) a delay line. The branch (32) is aligned at (37) with the fibre to be measured (38) associated to a mirror (42). The light reflected by the mirrors (41 and 42) forms interference fringes which are used to determine the chromatic dispersion of the fibre to be measured (38).
Gangadhar Garipelli, Tamara Rossy