Suppressing the turn-off-induced pulsations in VCSELs using an elevated oxide-layer structure.
We have demonstrated that, in elevated oxide-layer vertical-cavity surface-emitting lasers (VCSELs) where the spacing between 1-lambda cavity and oxide layer is 9lambda/4, a variety of turn-off-induced abnormalities such as secondary pulsations, bumps and tails is effectively suppressed. Compared are turn-off transient responses of conventional and elevated oxide-layer VCSELs with the oxide-aperture diameter of approximately 6.6 microm. The "on"- and "off"-current dependence of the turn-off-induced transient responses and bit rate dependence of the timing jitters show that the elevated oxide-layer structure effectively suppresses the turn-off-induced pulsations to less than half of the conventional one, which enables the VCSEL transmitter to operate without deleterious effects by the turnoff-induced pulsation.
Kim
Taeyong
T
Department of Electrical and Computer Engineering, Ajou University, Gyeonggi, South Korea. otherwisekay@gmail.com
Kim
Sang-Bae
SB
D016477:Artifacts; D004867:Equipment Design; D019544:Equipment Failure Analysis; D007834:Lasers; D010087:Oxides / Q000737:chemistry*
D010087:Oxides