Abstract
This paper reports experimental investigations of the effects of circularly
polarized optical injection on the lasing characteristics of vertical-cavity
surface-emitting lasers (VCSELs). The operating characteristics of the target
VCSELs are changed using available optical injection control parameters including
the strength and polarization state of the optical injection as well as the
frequency detuning between the injected light and the target VCSEL. Using
circularly polarized optical injection with frequency detuning around -10 GHz, the
linear output polarization of the stand-alone VCSEL can be converted into
circularly polarized or elliptically polarized emission when the VCSEL drive
current is close to or below the threshold current of stand-alone VCSEL. In
addition, highly nonlinear light–current characteristics are observed
in the optically injected VCSEL in the vicinity of threshold.
© 2011 IEEE
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