Abstract
The evolution characteristics of the time-delay signature (TDS) of polarized chaos is systematically investigated in a unidirectional-coupling vertical-cavity surface-emitting (VCSEL) scheme with variable-polarization optical injection (VPOI), by means of the time series, optical spectra, power spectra, and autocorrelation function. In this scheme, the polarized chaos with TDS from a master VCSEL (M-VCSEL) with the external cavity is unidirectionally injected into another solitary slave VCSEL (S-VCSEL) through VPOI. The numerical results show that the VPOI can exert significant influence on the TDS characteristics of polarized chaos in the S-VCSEL. Under special injection parameters, as the polarization injection angle (θp) of VPOI varies, the TDS evolution for the X polarization component can exhibit almost an opposite evolutionary pattern to that for the Y polarization component in the S-VCSEL. A series of TDSs is mapped in the θp plane, and the injection strength and frequency detuning have been simulated to thoroughly elaborate the TDS evolution of polarization-resolved chaos in the S-VCSEL. Moreover, the optimal parameter spaces with effectively suppressed TDS are also determined for each polarization component in those maps.
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