Abstract
Suppression of time-delay (TD) signature in a vertical-cavity surface-emitting laser subject to
double-cavity polarization-rotated optical feedback has been verified experimentally. The TD signature, represented by
the autocorrelation coefficient at the delay time in the external cavity, is measured in the two orthogonal
polarizations of the laser. The results show that TD signatures with double-cavity feedback can be 22% to
35% weaker than those with single cavity feedback for the same experimental parameters. For appropriate
feedback polarization, TD signatures become invisible. This is in good agreement with the theoretical prediction. Our
results also show that higher feedback strength results in greater suppression in TD signatures in a wide range of
polarization angle.
© 2014 IEEE
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