Abstract
To extend the buffer depth of a fiber loop optical buffer, we have experimentally
demonstrated an enhanced semiconductor optical amplifier (SOA)-based dual-loop
optical buffer (DLOB) for storing variable-length optical packets. We have
theoretically derived constraints governing the buffer depth of the DLOB,
in which the SOA not only provides a nonlinear phase shift in the loop to
implement the buffer function but also compensates for the fiber loop attenuation
during long-time storage. It is found that the maximum allowable length of
a stored packet to avoid the counter-propagation packet collision inside the
SOA depends on the SOA bias position as well as the length of the fiber loop.
To demonstrate the effectiveness of the proposed enhanced configuration, we
have successfully demonstrated the storage of 2.5-Gbps variable-length packets
even when the length of the input packet exceeds the corresponding length
of the fiber loop. Another unique advantage of the proposed enhanced DLOB
configuration is that it can also overcome the problem of power leakage of
the stored packet due to a directional gain difference of single SOA and gain
saturation.
© 2008 IEEE
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