Abstract
We present a review of research performed in the area of coherent access technologies
employing vertical cavity surface emitting lasers (VCSELs). Experimental demonstrations of optical
transmission over a passive fiber link with coherent detection using VCSEL local oscillators and
directly modulated VCSEL transmitters at bit rates up to 10 Gbps in the C-band as well as in the
O-band are presented. The broad linewidth and frequency chirp associated with directly modulated
VCSELs are utilized in an envelope detection receiver scheme which is demonstrated digitally
(off-line) as well as analog (real-time). Additionally, it is shown that in the optical front-end
of a coherent receiver for access networks, the 90
$^\circ$
hybrid can be replaced by a 3-dB coupler. The achieved results show that VCSELs
are attractive light source candidates for transmitter as well as local oscillator for coherent
detection PONs
© 2014 IEEE
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