Cost-effective digital coherent short-reach transmission system with D8QAM and low-complexity DSP

Abstract

We propose a cost-effective digital coherent scheme with low-complexity digital signal processing (DSP) for short-reach optical interconnection. Differential 8-ary quadrature amplitude modulation (D8QAM) with 1-decision-aided adaptive differential decoding bypasses carrier recovery and enables cycle-slip-free operation. We experimentally demonstrate that the receiver sensitivity of 400-Gb/s D8QAM is insensitive to the laser type, and is the same as 400-Gb/s 16QAM in the case of 2-km transmission with a distributed feedback (DFB) laser. The proposed adaptive equalizer (AEQ) using real-valued finite impulse response (FIR) filters and shorter tap lengths for the real-imaginary filters allows hardware-efficient implementation with high robustness to the receiver-side timing skew. In the case of 400-Gb/s D8QAM 10-km transmission, our AEQ achieves comparable performance as conventional 4×4 real-valued multi-input multi-output (MIMO) and the existing simplified AEQs with complexity reduction of 50% and 14% respectively.

Publication DOI: https://doi.org/10.1364/OE.422456
Divisions: College of Engineering & Physical Sciences > Aston Institute of Photonics Technology (AIPT)
College of Engineering & Physical Sciences
College of Engineering & Physical Sciences > School of Informatics and Digital Engineering > Electrical and Electronic Engineering
Additional Information: © 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
Uncontrolled Keywords: Atomic and Molecular Physics, and Optics
Full Text Link:
Related URLs: http://www.scop ... tnerID=8YFLogxK (Scopus URL)
https://www.osa ... 11892&id=449780 (Publisher URL)
PURE Output Type: Article
Published Date: 2021-04-12
Published Online Date: 2021-03-31
Accepted Date: 2021-03-26
Authors: Zhang, Tingting (ORCID Profile 0000-0002-3901-6267)
Xiang, Qian
Zhang, Sen
Liu, Lei
Sygletos, Stylianos (ORCID Profile 0000-0003-2063-8733)
Zuo, Tianjian

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