Abstract

The architectural options for optical access networks revolve around either point to point (star) systems or shared access systems (passive optical networks, or PONs). The PON approach has gained acceptance as the most promising for early economic penetration of fiber in the access network. These systems are, however, a radical departure for telephone companies whose experience lies with a metallic star network. New optical splitting components need to be housed as part of the external plant, and network operational practices must allow activity while the system is live. Once fiber systems penetrate the access network the addition of further optical components, particularly wavelength multiplexing components, can enable the graceful evolution to new broadband services. Optical amplifiers permit consideration of alternative network architectures. We will discuss the network options for optical access networks, including their advantages and potential problems. We will highlight the key components both for early networks and those required for future evolution to networks with full two-way broadband capability.

© 1992 Optical Society of America