86-GBaud subcarrier multiplexed 16QAM signal generation using an electrical 90 degree hybrid and IQ mixers

• Published in: Optics express Vol. 27; no. 8; pp. 11819 - 11829
• Main Authors: Zhang, T, Sanchez, C, Skvortcov, P, Ferreira, F, Sygletos, S, Phillips, I, Forysiak, W, Ellis, A
• Format: Journal Article
• Language: English
• Published: United States 15-04-2019
• ISSN: 1094-4087; 1094-4087
• DOI: 10.1364/OE.27.011819

We experimentally demonstrate an aggregate 86-GBaud (over three sub-bands and one polarization) signal generation based on subcarrier multiplexing technique using IQ mixers, an electrical 90 degree hybrid, and diplexers. The electrical hybrid allows transmitter-side digital signal processing to be simplified to pulse shaping and digital pre-emphasis. We verified the configuration by testing the performance of an 86-GBaud Nyquist-shaped 16 quadrature amplitude modulation signal with differential bit encoding. The implementation penalty assuming 7% hard-decision forward error correction is reduced to 2 dB by utilizing a 31-tap decision-directed least mean square based multiple-input multiple-output equalizer for sideband crosstalk mitigation.