Abstract

Due to their simple and cost-effective transceiver architecture, single-polarization and single-photodiode-based direct-detection (DD) systems offer advantages for metropolitan area network and data-center interconnect applications. Single-sideband subcarrier modulation (SSB SCM) signaling with DD has the potential to achieve high information spectral density (ISD) but its performance can be significantly degraded by signal–signal beat interference (SSBI). The recently proposed Kramers–Kronig (KK) digital signal processing scheme is effective in eliminating the SSBI penalty. Through the use of the KK scheme, we achieved 4 × 168 Gb/s wavelength division multiplexing DD SSB 64-QAM Nyquist-SCM signal transmission over 80 km of uncompensated standard single-mode fiber at a net ISD of up to 4.61 (b/s)/Hz. The joint optimization of the optical carrier-to-signal power ratio and the KK algorithm sampling rate is described.

© 2017 Crown

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