Abstract
Photonic Internet protocol (IP) routers can support higher
throughput and have lower end-to-end transfer delay, with respect to
electrical IP routers. The IP addresses are directly mapped onto the
optical layer and processed by performing optical correlations in the time
domain between the incoming code and the entries of the address bank; a
different tapped delay-line encoder/decoder (E/D) is used for each
photonic label. In the present paper, an innovative compact low-loss full
E/D is presented that generates/processes a set of orthogonal codes (OCs)
simultaneously. A tree of Mach-Zehnder interferometers (MZIs) furnishes
the whole set of photonic labels at the same time; it is also possible to
add/drop labels without modifying the remaining code sequences. The
correlation performances of the OCs can be further enhanced by inserting
additional phase shifters in the MZI's arms.
© 2004 IEEE
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