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7 páginas, 6 figuras.-- OCIS codes: 140.5960, 140.7260, 190.1450, 260.5430.We report on a theoretical and experimental investigation of the bistable behavior of the polarization of long-wavelength single-transverse mode vertical-cavity surface-emitting lasers (VCSELs) when subject to orthogonal optical injection. We have studied the bistability properties of the polarization switching that appear when changing the master laser wavelength with a fixed master laser power. Two bistable regions are found for polarization switchings appearing at short and long wavelengths. The directions of the obtained hysteresis cycles are in agreement with the experimental results. The widths of both bistable regions are also found to be similar and nearly independent of the injected power. The width of the region where polarization switching takes place is shown to increase as the injected power is increased. A good overall qualitative agreement is found between our theoretical and experimental results.The\udauthors acknowledge support from the Ministerio de\udCiencia e Innovación (Spain) under the Project TEC2009-\ud14581-C02-02. This work is also supported in part by\udCONICET Grant PIP 114-200801-00163, Argentina.Peer reviewe

Wavelength-induced polarization bistability in 1550 nm VCSELs subject to orthogonal optical injection