Optical feedback dependence of anticorrelation polarization dynamics in vertical-cavity surface-emitting lasers

The effects of optical feedback on the magnitude of the anticorrelation of polarization dynamics in vertical-cavity surface-emitting lasers have been studied experimentally. We compare the effects of polarization-preserved and polarization-selective optical feedback on the magnitude of the anti-correlation. The results show that in the case of the polarization-preserved or orthogonal polarization optical feedback into the VCSEL a strong anti-correlation between orthogonal polarizations can arise, however, no strong anticorrelation is observed for parallel polarization optical feedback. The correlations in the spectral domain have also been investigated. It is found that the anticorrelation is strong at low frequencies but poor at higher frequencies.