Abstract
The vertical-cavity surface-emitting lasers (VCSELs) with high single-mode (narrow linewidth) output
power are essential to minimize chromatic dispersion and to further improve the bit-rate distance product in a
multimode fiber, which has a significant propagation loss (∼3.5 dB/km) at 850 nm wavelength. Here, we
demonstrate the detailed design considerations and fabrication of a single-mode, high-power, and high-speed VCSELs at
the 850 nm wavelength with oxide-relief and Zn-diffusion apertures for the application of short (0.3 km) to
medium reach (2 km) optical interconnects. By optimizing the relative geometric sizes between two such apertures
in our demonstrated 850-nm VCSELs, we can not only attain high single-mode output power (∼6.5 mW), but also
with a reasonable threshold current (< 2.0 mA). Furthermore, the spatial hole burning effect induced
low-frequency roll off can also be minimized in our optimized structure to obtain a maximum data rate up to 26 Gbit/s.
The record-high bit rate-distance products for OM4 MMF transmission under ON–OFF keying (14 Gbit/s
$ \times $
2.0 km) modulation formats have been successfully
demonstrated by the use of our VCSEL.
© 2013 IEEE
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