COSNET - A COHERENT OPTICAL SUBSCRIBER NETWORK

A complete coherent multi-channel system, designed for application in the local loop is presented. The concept and the technical realization of a uni- and bi-directional system in a laboratory demonstrator are described. The realized network control, including frequency managemen t of the bi-directional channels, and network security are discussed. Attention is paid to the evolution scenario from a narrow band to a co mplete broad-band system. All aspects are integrated in a demonstrator , which is capable of supporting a large number of narrow-band and bro ad-band distributive and communicative services. Several novel technic al solutions (for frequency management, data induced polarization swit ching (DIPS), high-speed encryption and network signalling) are presen ted.