Abstract
The evolution of optical backbone networks to dynamically routed transparent WDM networks has entailed a demand for network management in the optical domain.1 In switched all-optical networks with unknown clients, new techniques must be developed to monitor the quality and identity of each wavelength channel without knowledge of the data and the transport history and without requiring optoelectronic conversion in the data path. Current performance monitoring techniques like bit error rate estimation in SONET/SDH, OSNR- or Q-factor-measurement depend on the knowledge of the data or they can not sense degradations due to pulse distortion that is critical at higher bitrates.2 By the new control modulation technique, the quality (BER) of a digital control channel is used as an over-all criterion for the performance of an unknown client signal degraded by several impairments, while other monitoring techniques focus on special degradation effects like fibre dispersion.3,4
© 2002 Optical Society of America
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