Transmission capacity of optical path overhead transfer scheme using pilot tone for optical path network

Photonic networks based on the optical path concept and wavelength division multiplexing (WDM) technology require unique operation, administration, and maintenance (OAM) functions, In order to realize the required OAM functions, the optical path network must support an effective management information transfer method, The method that superimposes a pilot tone on the optical signal appears very interesting for optical path overhead transfer, The pilot tone transmission capacity is determined by the carrier to noise ratio which depends on the power spectral density of the optical signal, The pilot tone transmission capacity of an optical path network employing WDM technology is elucidated; 4.5 kb/s transmission can be realized when the pilot tone modulation index is set at 3%.