Abstract
A two-bit all-optical digital comparator using single mode Fabry–Pérot laser
diodes (SMFP-LDs) at an input data rate of 10 Gbps is proposed and demonstrated.
All-optical comparator is demonstrated using cascaded logic units which are based on
injection locking, multi-input injection locking and supporting beam principles for
suppressing the dominant mode of SMFP-LDs. Digital comparators are the key components
for the decision making circuits, the integral part of the arithmetic and logical units
of optical data processors. The output performance of the proposed all-optical
comparator is verified with output waveform, rising-falling time, output eye diagram,
and bit error rate (BER) at 10 Gbps input Non Return to Zero (NRZ) PRBS of 2<sup>31</sup>-1
signal. The rising/falling time of about 47 ps, clear output waveforms, and clear output
eye diagram with an extinction ratio of about 12 dB are obtained. A maximum power
penalty of 1.3 dB is measured at a BER of 10<sup>-9</sup>.
© 2011 IEEE
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