Bindu M, Krishna; Manu P, John; Nandakumaran, V M(Indian Academy of Sciences, February , 2010)
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Abstract:
Chaotic synchronization of two directly modulated semiconductor lasers with
negative delayed optoelectronic feedback is investigated and this scheme is found to be
useful for e±cient bidirectional communication between the lasers. A symmetric bidirec-
tional coupling is identified as a suitable method for isochronal synchronization of such
lasers. The optimum values of coupling and feedback strength that can provide maxi-
mum quality of synchronization are identified. This method is successfully employed for
encoding/decoding both analog and digital messages. The importance of a symmetric
coupling is demonstrated by studying the variation of decoding efficiency with respect to
asymmetric coupling.