Abstract
Advanced modulation formats combined with digital signal processing and direct detection is a promising way to realize high capacity, low cost and power efficient short reach optical transmission system. In this paper, we present a detailed investigation on the performance of three advanced modulation formats for 100 Gb/s short reach transmission system. They are PAM-4, CAP-16 and DMT. The detailed digital signal processing required for each modulation format is presented. Comprehensive simulations are carried out to evaluate the performance of each modulation format in terms of received optical power, transmitter bandwidth, relative intensity noise and thermal noise. The performance of each modulation format is also experimentally studied. To the best of our knowledge, we report the first demonstration of a 112 Gb/s transmission over 10km of SSMF employing single band CAP-16 with EML. Finally, a comparison of computational complexity of DSP for the three formats is presented.
Highlights
The fast increasing bandwidth demand of data center and other optical interconnect applications requires optical transmission system with data rate up to 400 Gb/s or even 1 Tb/s
Comprehensive simulations were carried out and the results show that discrete multi-tone (DMT) exhibits better performance than pulse amplitude modulation (PAM)-4 and carrier-less amplitude and phase modulation (CAP)-16 in terms of received optical power, TX bandwidth and thermal noise
DMT is more sensitive to relative intensity noise (RIN) than PAM-4 and CAP-16
Summary
The fast increasing bandwidth demand of data center and other optical interconnect applications requires optical transmission system with data rate up to 400 Gb/s or even 1 Tb/s. We have successfully demonstrated a 112 Gb/s PAM-4 transmission system with commercial available 25G EML-TOSA and PINROSA [4] Another alternative scheme that may provide good system performance and high data rate using low-cost and bandwidth limited optical components is carrier-less amplitude and phase modulation (CAP). We provide a comprehensive comparison of three typical advanced modulation formats for short reach transmission systems by using the same simulation model and experimental setup.
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