Abstract
Rather than performing bit-level clock recovery, the Asynchronous Digital Optical RE generation (ADORE) [1] resynchronizes incoming packets to a free running local clock at each network node [2]. The key significance of this is asynchronous approach is that it removes the severe timing and link synchronisation constraints in synchronous networks, particularly those with a mesh architecture. Asynchronous regeneration is achieved by simultaneously sampling input packets with equally spaced clock phases (≧ 4 is required [1]), and selecting the phase which maximizes performance. Here, we numerically analyse the properties of an enhanced ADORE designed for 40Gbit/s operation, using only one electro-absorption modulator (EAM). By using the clockwise and anti-clockwise paths, and two orthogonal polarizations in the EAM-loop, the required four clock sampling phases may be implemented. We further simplify the ADORE by interferometically combining the signals from two adjacent sampling clock phases (so-called neighbour-combination) [2]. This neighbour-combination reduces the port count of the selector switch from 4 to 2.
© 2007 IEEE
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