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

Ahmad Abdo, Xueyang Li, Md Samiul Alam, Mahdi Parvizi, Naim Ben-Hamida, Claude D’Amours and David Plant
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Ahmad Abdo: School of Electrical Engineering and Computer Science, University of Ottawa, Ottawa, ON K1N 6N5, Canada
Xueyang Li: Department of Electrical and Computer Engineering, McGill University, Montreal, QC H3A 2A7, Canada
Md Samiul Alam: Department of Electrical and Computer Engineering, McGill University, Montreal, QC H3A 2A7, Canada
Mahdi Parvizi: Ciena Corporation, Ottawa, ON K2K 0L1, Canada
Naim Ben-Hamida: Ciena Corporation, Ottawa, ON K2K 0L1, Canada
Claude D’Amours: School of Electrical Engineering and Computer Science, University of Ottawa, Ottawa, ON K1N 6N5, Canada
David Plant: Department of Electrical and Computer Engineering, McGill University, Montreal, QC H3A 2A7, Canada

Future Internet, 2019, vol. 11, issue 12, 1-10

Abstract: 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.

Keywords: optical communications; pluggable transceivers; pre-emphasis; coherent communications (search for similar items in EconPapers)
JEL-codes: O3 (search for similar items in EconPapers)
Date: 2019
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