This paper describes the TDMA uplink of the ACTS PLANET project, realizing a high split long range access network using optical amplification. An overview of the network topology and the different building blocks is given. In particular, the differentiating burst mode receiver, the optical repeater units and the amplified splitter controller will be discussed. Bit error measurements were performed to define the system limits of the access network. It is shown that a feeder length of 90 km, in combination with a split factor of 2000 and a drop section length of 10 km are feasible.
Brecht Stubbe, Peter Vaes, Lieven Gouwy, Chris Coene, Xing-Zhi Qiu, Bart Staelens, Jan Vandewege, B. Hans Slabbinck, Claire Martin, Ingrid Van de Voorde
This paper presents the use of distributed, intelligent control and management in optically amplified repeaters. These optical repeater units (ORUs) are used in an optical access network. A semiconductor optical amplifier (SOA) has been used in the upstream direction because of the possibility of fast switching. The real time control platform consists of both a hard- and a software part. The software control is handled with the embedded control system FORTRESS developed by IMEC.
This paper presents some results of a SuperPON (lab) demonstrator. The SuperPON is an ATM based passive optical (access) network, intended to support a large split (greater than 2000), and a long range (80 km, of which 70 km in the feeder section, and 10 km in the drop). The overall network capacity is 2.5 Gbit/s TDM downstream at 1550 nm, and 155 Mbit/s TDMA upstream at 1310 nm. The first (lab) demonstrator has been built around an APON system, into which a 2.5 Gbit/s downstream upgrade has been introduced, together with optical amplification to overcome large network losses. This optical amplification consists of EDFAs in the downstream, and switched SOAs in the upstream direction. On the demonstrator set-up, various measurements have been performed to look for the acheivable power budget that can be tolerated in the different network sections. The demonstrator does not only show the feasibility of the architecture and optical technologies, but also demonstrates the capabilities of real services.
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