Abstract
A novel approach for resolution of contentions between asynchronous
optical packets, exploiting a self-synchronizing mechanism by means of dynamic
all-optical tunable delay line based on stimulated Brillouin scattering in
fibers, is reported. Time delay between contending optical packets is mapped
into the output timing of a contention-detecting pulse produced by the tunable
delay line. The output pulse from the delay line triggers an integrated all-optical
flip-flop that generates a synchronized gating signal driving a semiconductor-based
all-optical switch, for low-priority packets deflection. Correct operation
of the proposed scheme without bit loss or packet fragmentation is demonstrated,
and error-free operation for the switched packets is reported under different
cases of relative delay between incoming optical packets. The scheme operates
entirely in the photonic domain and exploits integrated optical switches and
a passive optical-delay line for minimized node latency. Extension to symmetric
operation allowing priority swapping between the input packets is also proposed.
© 2013 IEEE
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