Chaos synchronization in vertical-cavity surface-emitting laser based on rotated polarization-preserved optical feedback

Abstract

In this paper, the influence of the rotating polarization-preserved optical feedback on the chaos synchronization of a vertical-cavity surface-emitting laser (VCSEL) is investigated experimentally. Two VCSELs' polarization modes (XP) and (YP) are gradually rotated and re-injected back into the VCSEL. The anti-phase dynamics synchronization of the two polarization modes is evaluated using the cross-correlation function. For a fixed optical feedback, a clear relationship is found between the cross-correlation coefficient and the polarization angle θp. It is shown that high-quality anti-phase polarization-resolved chaos synchronization is achieved at higher values of θp. The maximum value of the cross-correlation coefficient achieved is -0.99 with a zero time delay over a wide range of θp beyond 65° with a poor synchronization dynamic at θp less than 65°. Furthermore, it is observed that the antiphase irregular oscillation of the XP and YP modes changes with θp. VCSEL under the rotating polarization optical feedback can be a good candidate as a chaotic synchronization source for a secure communication system.

Antiphase chaotic synchronization enhancement in a vertical cavity surface emitting laser

“…Gain competition between the laser's co-existing polarization modes is also responsible for the polarization instability in the output power of VCSEL [22]. In our previous works on VCSELs for a range of bias currents and OF levels, we investigated the antiphase dynamics [23][24][25] and showed that the antiphase dynamics of the two polarization modes were correlated for the preserved OF level of -7.4 dB. It was also shown that, there was high quality antiphase oscillations over a wide range of polarization angle (i.e., > 45 o ) [23].…”

“…In our previous works on VCSELs for a range of bias currents and OF levels, we investigated the antiphase dynamics [23][24][25] and showed that the antiphase dynamics of the two polarization modes were correlated for the preserved OF level of -7.4 dB. It was also shown that, there was high quality antiphase oscillations over a wide range of polarization angle (i.e., > 45 o ) [23]. In [24], using numerical modelling it was shown that, antiphase synchronization with poor and good qualities were achieved for low and high levels of OF, respectively.…”

Polarization output power stabilization of a vertical-cavity surface-emitting laser

“…Recently, several theoretical and experimental works have investigated the polarization modes characteristics of VCSELs with either the conventional OF or a rotated polarization angle of OF [5,[7][8][9][10][11]. The dynamics of VCSEL under OF with a rotating polarization angle was shown to have a great potential in numerous applications such as free space optical communications for improved level of security at the physical layer [12][13][14], sensing [15], high frequency pulses generation and optical bi-stability [16]. However, in some cases, the OF has undesirable effects on the laser characteristics, which can result in unwanted instabilities in the laser output power, thus limiting the laser performance when used for example communication systems.…”

Polarization Switching Dependence of VCSEL on Variable Polarization Optical Feedback

“…The results showed that the modulation parameters (i.e., frequency f mod and the modulation-depth M mod ) can results in elimination of PS in VCSELs. Recently we have experimentally investigated the harmonics distortion dependency of the chaotic signal dynamics of VCSEL on orthogonal polarization [25] and on the rotated angle, respectively [3] of the OF. However, an experimental study supported by predicted polarization properties of VCSELs subject to θ p has not yet been reported.…”