Abstract
Theoretical investigations have been carried out to analyze and compare
the link power budget and power dissipation of non-return-to-zero (NRZ), pulse
amplitude modulation-4 (PAM-4), carrierless amplitude and phase modulation-16
(CAP-16) and 16-quadrature amplitude modulation-orthogonal frequency division
multiplexing (16-QAM-OFDM) systems for data center interconnect scenarios.
It is shown that for multimode fiber (MMF) links, NRZ modulation schemes with
electronic equalization offer the best link power budget margins with the
least power dissipation for short transmission distances up to 200 m;
while OOFDM is the only scheme which can support a distance of 300 m albeit
with power dissipation as high as 4 times that of NRZ. For short single mode
fiber (SMF) links, all the modulation schemes offer similar link power budget
margins for fiber lengths up to 15 km, but NRZ and PAM-4 are preferable due
to their system simplicity and low power consumption. For lengths of up to
30 km, CAP-16 and OOFDM are required although the schemes consume 2 and 4
times as much power respectively compared to that of NRZ. OOFDM alone allows
link operation up to 35 km distances.
© 2012 IEEE
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