The experimental demonstration of MOSAIC, a reconfigurable WDM add/drop network with subcarrier multiplexed control, is presented. The MOSAIC network implements the optical layer protocol to support bit-rate transparent multichannel lightpaths. Two types of add/drop multiplexers are implemented and combined in a three-node experiment. Multihop lightpaths are established giving an end-to-end bit error rate of better than 10 0 0 09 at 1.2 Gbps. The reconfigurable add/drop multiplexer is based on a novel dilated 2 2 2 2 2 acoustooptic filter switch crossconnect and an analog optoelectronic crossconnect that drives a ten-wavelength laser array transmitter up to 2.5 Gbps per wavelength. The fixed wavelength add/drop multiplexer utilizes a fast digitally tunable laser transmitter. Both add/drop multiplexers support bit-rate transparent 2R optoelectronic regeneration as well as wavelength translation. Subcarrier multiplexing on each wavelength is used to support channel state monitoring and channel equalization as well as transmission of digital network control information. Systems experiments demonstrate cascaded 2R optoelectronic regeneration with wavelength translation and cascaded multichannel optical switching with up to seven hops. It is shown that combining cascaded 2R optoelectronic regeneration with cascaded multichannnel optical switching can be used to balance jitter accumulation and amplified spontaneous emission generated amplitude noise to yield high signal-to-noise ratio for lightpaths. Index Terms-Optical add/drop multiplexers, optical networks, optical subcarrier multiplexing, optical transport networks, reconfigurable add/drop multiplexers, transparent optical networks, wavelength division multiplexing. I. INTRODUCTION R ECONFIGURABLE wavelength division multiplexed (WDM) add/drop fiber transport networks have the potential to satisfy the demands of future broadband communications applications [1]. Reconfigurability in the add/drop multiplexers will result in increased network configuration flexibility, remote provisioning, and protection switching capabilities.

ThP4 2:45pmExperimental demonstration of MOSAIC: a multiwavelength optical subcarrier multiplexed controlled network equalization. The OXC incorporates a multichannel SCM digital receiver to detect the presence of SCM channels at the ADM input and recover control data to configure the OXC and OEOXC. A second multichannel SCM circuit is used to measure the relative RF subcarrier power in all channels and is used