Synchronization of Chaotic Intensities and Phases in an Array of N Lasers

A linear array of N mutually coupled single-mode lasers is investigated.It is shown that the intensities of Nlasers are chaotically synchronized when the coupling between lasers is relatively strong.The chaotic synchronization ofintensities depends on the location of the lasers in the array.The chaotic synchronization appears between two outmostlasers,the second two outmost lasers,etc.There is no synchronization between nearest neighbors of the lasers.If thenumber of N is odd,the middle laser is never synchronized between any lasers.The chaotic synchronization of phasesbetween nearest lasers in the array is examined by using the analytic signal and the Gaussian filter methods based onthe peak of the power spectrum of the intensity.It can be seen that the message of chaotic intensity synchronization isconveyed through the phase synchronization.