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Open AccessArticle

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

1
School of Electrical Engineering and Computer Science, University of Ottawa, Ottawa, ON K1N 6N5, Canada
2
Department of Electrical and Computer Engineering, McGill University, Montreal, QC H3A 2A7, Canada
3
Ciena Corporation, Ottawa, ON K2K 0L1, Canada
*
Author to whom correspondence should be addressed.
Future Internet 2019, 11(12), 256; https://doi.org/10.3390/fi11120256
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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