Patent ID: 8699875
Filing Date: 2014-04-15
Classification: G01M,H04B

Abstract:
1. A method of dispersion measurement in an optical fibre network, said network comprising at least first and second nodes connected by a length of optical fibre, the method comprising the steps of: (a) setting the second node such that a single receiver can receive at least two different wavelengths λ (b) transmitting from the first node, using a single tunable laser transmitter, two consecutive bursts of data at different wavelengths λ (c) maintaining a delay between the two consecutive bursts of data by selective switching of the tunable laser; (d) receiving at the second node the two consecutive bursts of data; (e) measuring a relative delay between the two sequences of amplitude modulated data each one contained in one of the received bursts of data; (f) calculating the dispersion of the optical fibre from the measured relative delay and one or more of the following: the fixed known delay, the length of the optical fibre and the at least two different wavelengths.