Abstract
We have demonstrated fixed-current operation of a vertical-cavity
surface-emitting laser (VCSEL) transmitter operating at 1.25 Gb/s over a wide
temperature range by using an elevated-oxide-layer structure. Four different types of
oxide VCSELs have been prepared for the transmitter modules; conventional-oxide and
elevated-oxide-layer VCSELs with the oxide-aperture diameter of 6.6 and 10 μm, and
their temperature dependence of the threshold current and turn-off transient responses
have been measured. Approximately 10%-reduced both fall time and timing jitter mainly
originating from the alleviated turn-off-induced abnormalities in the
elevated-oxide-layer VCSEL transmitters contributed to achieve the fixed-current
operation in the temperature range from -20°C to 80°C. Although the
operating current of the elevated-oxide-layer VCSEL transmitter should be increased as
the threshold current increases, a simple driving circuit owing to the fixed-current
operating transmitter over a wide temperature range will bring a drastic energy saving
in the optical data transmission system that incorporates VCSEL as a light
source.
© 2011 IEEE
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