Abstract
In general, optical correlators can perform very fast signal processing. A header correlator is implemented as a hard-wired series of optical delay lines for which each header bit experiences a different optical delay. If a particular header bit has a corresponding 1 in the look-up table, then the delay will put that header bit inside an autocorrelation time window. If a header bit has a corresponding 0 in the look-up table, then the delay will put that header bit outside an autocorrelation time window. However, a key limitation is that the optical technology does not scale well, thereby making it practical for recognizing only a limited number of header bits. This may not be a significant drawback if only a few number of bits must be recognized in order to route packets to only a small number of ports.
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