Abstract
A new method for an online measurement of the dispersion sign in optical communication systems is demonstrated. The measurement of the dispersion sign is based on a low frequency amplitude and wavelength modulation of a DFB laser source in the transmitter. By comparing, at the receiver, the phase of the extracted clock signal to the phase of a signal, obtained due to the amplitude modulation of the DFB laser, the sign of the dispersion is determined. The new monitoring technique might be important in high data rate optical communication systems where the allowable residual dispersion is close to zero.
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