Abstract
The increasing demand in the Internet network for real-time multimedia
data traffic with high quality of service (QoS) is pushing the limits of
existing network structure. Optical packet switching (OPS) is considered as
a possible technology for future telecommunication networks due to its
compatibility with bursty traffic and efficient use of the network
resources. But OPS brings about new challenges to the research in optical
performance monitoring (OPM). In this scenario, each packet follows its own
path along the network depending on the routing information contained in the
label and thereby packets suffer from different signal degradations.
Therefore, a definitive goal for OPM is to provide comprehensive signal
quality information as part of QoS implementation to keep the level of QoS
promised to customers. In this paper, a novel optical SNR (OSNR) monitoring
technique based on the use of optical correlation is presented. A fiber
Bragg grating-based correlator was constructed and used to experimentally
demonstrate the successful correlation. Experiments performed on a 40 Gb/s
system confirm the viability of this approach. By measuring statistics from
the autocorrelation peak, the monitor is capable of direct OSNR monitoring
with an error of less than 0.5 dB.
© 2009 IEEE
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