Abstract
We propose an RF tone in-band labeling technique that is able to support
large-scale and low-latency optical packet switch. This approach is based on N in-band
wavelengths, each carrying M radio frequency (RF) tones. The wavelengths and the tones
have a binary value, and are able to encode 2<sup>N×M</sup> possible routing
address. We develop an optical label processor for the RF tone in-band optical label
based on parallel and asynchronous processing. It allows the optical packet switch with
an exponential increase of number of ports at the expense of limited increase in the
latency and the complexity. By using RF tone in-band labeling technique, we demonstrate
error free (bit error rate <10<sup>-9</sup>) optical packet switching operation for both
160 Gb/s packets and 40 Gb/s packets. We further investigate the scalability, the
latency and the optical power fluctuation tolerance of the proposed RF tone in-band
labeling technique. We show that 30 label bits are able to be delivered using single
in-band wavelength, and the label processor introduces an extra latency of less than 7
ns.
© 2012 IEEE
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