A supervisory channel is provided on an optical path (31) between nodes of an optical communication network. The nodes are arranged to use a set of wavelengths allocated for carrying traffic channels. An optical signal (16) which carries a supervisory channel is generated at a supervisory channel transmitter (15) and added (12) to the optical path (31) downstream of an optical amplifier (11). The optical signal (16) has a wavelength which is one of the set of wavelengths allocated for carrying traffic. The method is performed at a time when the wavelength is not being used to carry traffic. An impairment parameter of the received optical signal is measured at a supervisory channel receiver (15). The receiver is a coherent receiver and the impairment parameter is chromatic dispersion or polarisation mode dispersion.
申请公布号
WO2013068039(A1)
申请公布日期
2013.05.16
申请号
WO2011EP69742
申请日期
2011.11.09
申请人
TELEFONAKTIEBOLAGET L M ERICSSON (PUBL);CAVALIERE, FABIO;BOTTARI, GIULIO