Data pattern dependence of VCSEL far-field distributions
Date
2004
Authors
Lear, Kevin L., author
Al-Sowayan, S., author
IEEE, publisher
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Abstract
The far field divergence angle distribution of vertical-cavity surface-emitting lasers is found to exhibit dependence on the data pattern driving the lasers. Two 50% duty cycle 1.25-Gb/s data patterns chosen to cause the same thermal conditions but with frequency content differing by a factor of 16 resulted in changes in the beam profile distributions with up to a 30% power variation in the central on-axis portion of the beam. Examination of the temporal waveforms as a function of far field angle revealed overshoot in the on-axis power and undershoot in the off-axis portion of the beam.
Description
Rights Access
Subject
far field
data pattern dependent
beam divergence
laser diode
multimode fiber optic