Monitoring the optical performance in a transparent and configurable metro area network

We report on experimental results of optical performance monitoring (OPM) in a transparent optical network transmitting channels modulated at 10 Gb/s. This experiment was performed in an entirely field installed DWDM ring network (DWDM ring capacity: 80/spl times/10 Gb/s) with configurable optical add drop multiplexers (OADMs) at different locations within the city of Berlin, Germany.