Abstract
Label stacking is used for hierarchical addressing to reduce the size of lookup tables and to increase the
speed of the routing process. We propose an optical label stacking using spectral-amplitude codes (SAC) as labels to
accomplish ultrafast packet forwarding. We discuss the advantages of this label architecture compared to other
proposals in the literature and present experimental results. We experimentally examine two types of optical
packets, one with separable SAC labels and the other one with SAC-encoded payloads. In the first case, the SAC label
is a collection of spectral tones modulated at the packet rate (low rate), and the payload is on a separate
wavelength modulated at the data rate (fast rate). In the second case, the payload data modulates the collection of
wavelengths that constitute the code. We implement a network with two forwarding nodes, and we transmit the packets
with two labels in the label stack over 80 km of fiber and measure the bit error rate (BER) after two hops. We
achieve error-free transmission (BER < 10<sup>-9</sup>) for
the packets with SAC labels and SAC-encoded payload at payload bit rates of 10 and 2.5 Gb/s, respectively. This is
the first experimental demonstration of optical label stacking to our knowledge.
© 2007 IEEE
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