Chromatic dispersion measurement with double sideband phase noise canceled OFDR

OTDR is the realistic method for measuring chromatic dispersion of already deployed fibers because it is one end measurement technique. Furthermore, it can measure chromatic dispersion of each fiber segment connected together in the fiber link. On the other hand, though OFDR has better spatial resolution and sensitivity than OTDR, its measurable distance is limited by laser phase noise. We have proposed Double Sideband Phase Noise Canceled OFDR (DB-PNC-OFDR), which enables the long distance measurement. In this paper, we have used our proposed DB-PNC-OFDR to measure chromatic dispersion in a 50 km long fiber link made up of three fiber segments. Also chromatic dispersion of each fiber segment in the fiber link have been measured. Moreover, the chromatic dispersion of a standard single-mode fiber was measured. To confirm the accuracy of the proposed method, the measured chromatic dispersion was compared with a widely used phase shift method.