Analytical Study of Optical SSB-DMT With IMDD

Abstract

We theoretically study the performance of single sideband discrete multi-tone (SSB-DMT) in the C-band with intensity modulation and direct detection (IMDD). Our analysis allows us to quantify the impact of different noise sources such as signal-to-signal beating interference, phase-to-amplitude noise, attenuation, and receiver sensitivity on SSB-DMT. Our analytical tools also allow us to optimize the signal-to-carrier power ratio to maximize SSB-DMT throughput. We provide equations to calculate bit error rate of bit allocated SSB-DMT. Finally we examine various system parameters (laser linewidth, system bandwidth, and fiber length) to determine their impact on the performance of zero guard band SSB-DMT.

Interplay of Bit Rate, Linewidth, Bandwidth, and Reach on Optical DMT and PAM With IMDD

“…In this paper we will examine DMT performance on the C-band. We model the SSB-DMT launched signal as in our previous work [17]. The DMT signal in the time domain, s DM T (t), equals…”

“…Summarizing our results from [17], the power of P2A noise per subchannel is calculated by multiplying carrier power by the in-band subchannel P2A power, i.e.,…”

“…Signal to signal beating interference (SSBI) is present in both O-band and C-band and is a major source of impairment for DMT. For O-band modulation, SSBI for SSB-DMT can be mitigated, while on C-band it remains a factor [17]. Therefore, there is a trade-off between attenuation on O-band and dispersion on C-band in comparing DMT with PAM.…”

“…Our analytical study of SSB-DMT on C-band in [17] shows the effect of phase to amplitude noise (P2A), inter-carrier interference (ICI), SSBI, attenuation C-band. Using this analysis we also optimized SSB-DMT in terms of signal-to-carrier power ratio to achieve highest possible throughput in any system condition.…”

“…Section III introduces equations to calculate bit error rate (BER) for PAM and DMT modulation formats, relying on methodology from [17] to optimize DMT performance. Using results from section III, in section IV we expand on [1] to examine the interplay of laser linewidth, fiber length, transmission rate, and channel bandwidth.…”