Search

We study polarization switching and hysteresis in a vertical-cavity surface-emitting laser (VCSEL) subject to an orthogonal optical injection, such that the polarization of the injected light is perpendicular to that of the free-running VCSEL. We use the framework of the spin-flip model to characterize the polarization state of the VCSEL as a function of the frequency detuning. With appropriated injection conditions, the orthogonal polarization turns on and locks to the injected field. Increasing and decreasing the detuning across the two locking boundaries results either in narrow or wide hysteresis cycles, or even in irreversible switching. These results are in a good agreement with recent experimental observations. Fil: Salvide, Matias. Universidad Nacional del Centro de la Provincia de Buenos Aires. Facultad de Ciencias Exactas. Instituto de Fisica Arroyo Seco; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina Fil: Masoller, Cristina. Universidad Politecnica de Catalunya; España Fil: Torre, Maria Susana. Universidad Nacional del Centro de la Provincia de Buenos Aires. Facultad de Ciencias Exactas. Instituto de Fisica Arroyo Seco; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina

Polarization switching in 1550nm-VCSELs under single and double pulsed polarized optical injection is investigated. The minimum power needed to obtain normal and reverse PS was studied. Good agreement between theory and experiments is found.

We study the dynamics of a vertical-cavity surface-emitting laser (VCSEL) with continuous-wave (cw) orthogonal optical injection from a tunable laser. We use the dynamical properties of polarization bistability and the interplay with internal or external noise to demonstrate numerically a reliable logic output to two logic inputs encoded in the optical frequency of the injected light. This all-optical configuration is more than ten times faster than the electro-optical implementation and has the advantage of operating at constant injection power. Fil: Salvide, Matias. Universidad Nacional del Centro de la Provincia de Bs.as.. Facultad de Ciencias Exactas. Instituto de Fisica Arroyo Seco; Argentina; Fil: Masoller, Cristina. Universidad Politecnica de Catalunya; España; Fil: Torre, Maria Susana. Universidad Nacional del Centro de la Provincia de Bs.as.. Facultad de Ciencias Exactas. Instituto de Fisica Arroyo Seco; Argentina

8 páginas, 8 figuras, 1 tabla., Modal selection induced by parallel polarized optical injection in a vertical-cavity surface-emitting laser (VCSEL) emitting in two transverse modes is analyzed from a theoretical point of view. We show that the selection of the fundamental transverse mode can be achieved when the two transverse modes have parallel polarizations. This selection is accompanied by locking of the fundamental mode to the optically injected signal for large enough values of the wavelength detuning between the fundamental mode and the externally injected signal. The injected power needed to induce modal selection grows as the VCSEL bias current is increased for small positive wavelength detunings, while it is independent on the bias current for larger wavelength detunings. That power exhibits a minimum with respect to the injection wavelength at a value λmin that is slightly longer than the wavelength of the fundamental mode of the solitary VCSEL. We also show that the selection process exhibits bistable behavior when the wavelength of the optically injected signal increases beyond λmin . The width of the bistable region increases linearly with the wavelength of the optically injected signal. Our results show that λmin also increases linearly with the VCSEL bias current. Higher order transverse mode selection and bistability, similar to those found for the fundamental mode, are obtained when the optical injection wavelength is close to that of the higher order mode. Our results are in agreement with the experimental results reported earlier., This work was supported in part by the Ministerio de Educación y Ciencia, Spain, under Project TEC2009-14581-C05-02. The work of M. S. Torre was supported in part by the Consejo Nacional de Investigaciones Científicas y Técnicas, Argentina, under Grant PIP 114-200801-00163.

We study numerically the output polarization of a vertical-cavity surface-emitting laser (VCSEL) subject to orthogonal optical injection. We focus on the width of the hysteresis cycle induced by the variation of the detuning of the injected light. For positive detuning and strong enough optical injection we find that the hysteresis width is proportional to the birefringence parameter; for negative detuning the hysteresis width is narrow and is unaffected by the injection strength. Our results are in good agreement with recent experimental observations.