Abstract
Vertical Cavity Surface Emitting Lasers (VCSELs) are becoming very important optoelectronic communication devices. VCSELs can be used for the transmission of binary signals by modulating the pump current between two values which correspond to a high ("1") and a low ("0") output intensity level. However, they present some peculiar features, namely, the emission in several transverse modes and polarization fluctuations. In some critical current regions, these lasers can emit undifferently in two different states of polarization and/or transverse pattern for the same value of the pump current. The laser dynamics in such narrow bistable regions is characterized by noise-induced jumps between the two emission states. A polarization and/or a spatial filter allows one to observe the random jumps as light intensity hops.
© 2000 IEEE
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