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Partial Pre-Emphasis for Pluggable 400 G Short-Reach Coherent Systems

School of Electrical Engineering and Computer Science, University of Ottawa, Ottawa, ON K1N 6N5, Canada
Department of Electrical and Computer Engineering, McGill University, Montreal, QC H3A 2A7, Canada
Ciena Corporation, Ottawa, ON K2K 0L1, Canada
Author to whom correspondence should be addressed.
Future Internet 2019, 11(12), 256;
Received: 2 November 2019 / Revised: 30 November 2019 / Accepted: 10 December 2019 / Published: 11 December 2019
(This article belongs to the Section Network Virtualization and Edge/Fog Computing)
Pre-emphasis filters are used to pre-compensate for the transmitter frequency response of coherent systems to mitigate receiver noise enhancement. This is particularly essential for low-cost, low-power coherent transceivers due to having an extremely bandlimited transmitter. However, the pre-emphasis filter also increases the signal peak-to-average power ratio (PAPR), thus posing a higher effective number of bits (ENoB) requirement for the arbitrary waveform generator (AWG). In this paper, we first numerically study the PAPR impact of partial pre-emphasis filters. We show that with partial pre-emphasis, an ENoB reduction from 5 to 4.5 bits is attainable at the same signal-to-noise ratio (SNR) out of the AWG. Next, we experimentally investigate the overall performance penalty of partial pre-emphasis in a 50 Gbaud 16QAM coherent system. A manageable Q factor penalty of around 0.5 dB is found for both single-polarization and dual-polarization systems with a 0.8 dB PAPR reduction. View Full-Text
Keywords: optical communications; pluggable transceivers; pre-emphasis; coherent communications optical communications; pluggable transceivers; pre-emphasis; coherent communications
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Abdo, A.; Li, X.; Alam, M.S.; Parvizi, M.; Ben-Hamida, N.; D’Amours, C.; Plant, D. Partial Pre-Emphasis for Pluggable 400 G Short-Reach Coherent Systems. Future Internet 2019, 11, 256.

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