Generation and Performance of AMI-RZ and DCS-RZ Signals with Sideband Suppression

P.M.A. Charrua, A.V.T. Cartaxo, and M.R. Leiria (Portugal)

Keywords

Optical systems and components, sideband suppression, singlesideband (SSB), alternatemark inversion returntozero (AMIRZ), duobinarycarrier suppressed returntozero (DCSRZ), longhaul trans

Abstract

Optical sideband suppression (SBS) by means of optical filtering is proposed for alternate-mark-inversion return-to-zero (AMI-RZ) and duobinary-carrier suppressed RZ (DCS-RZ) coding formats. The power of the non-suppressed sideband to the power of the suppressed sideband ratio (SSPR) is used to categorize the level of sideband suppression. A minimum level of SSPR of 20 dB is required for single-sideband (SSB) signals. SSPRs of 24 dB for AMI-RZ and 27 dB for DCS-RZ are achieved, showing that these filtered signals are actually SSB signals. Results reveal that AMI-RZ and DCS-RZ double-sideband modulation formats show better transmission performance, even after 1080 km of standard single-mode fiber (Q-factor > 9.5). However, SSB modulation formats demonstrate much higher tolerance to group velocity dispersion. Simulation results show that AMI-RZ-SSB and DCS-RZ-SSB signals exhibit performance similar to the filtered duobinary signal. After 1080 km of SMF, a Q-factor of nearly 7 remains attainable for both coding formats with SSB filtering.

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