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A chaos-based communication scheme allowing simultaneous bidirectionalmessage transmission (Opt. Lett. 32, 403, 2007) is investigated numerically.Incoherent feedback and coupling case is analyzed, which is expected in reallong-distance optical communication systems. It is shown that identicalsynchronization of chaotic laser waveforms and bidirectional messagetransmission are possible as in the coherent coupling case. However, thechaotic regime at incoherent feedback and coupling is quite different. It isregular destabilized relaxation oscillations with the chaotic envelope. Suchdynamics leads to restriction of the transmitting signal bit rate by a portionof relaxation oscillations frequency.

Identical chaotic synchronization and bidirectional message transmission in incoherently coupled semiconductor laser diodes