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

Tingting Zhang; Qian Xiang; Sen Zhang; Lei Liu; Stylianos Sygletos; Tianjian Zuo

doi:10.1364/OE.422456

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

Tingting Zhang^*, Qian Xiang, Sen Zhang, Lei Liu, Stylianos Sygletos, Tianjian Zuo

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

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.

Original language	English
Pages (from-to)	11892-11902
Number of pages	11
Journal	Optics Express
Volume	29
Issue number	8
Early online date	31 Mar 2021
DOIs	https://doi.org/10.1364/OE.422456
Publication status	Published - 12 Apr 2021

Bibliographical note

Access to Document

10.1364/OE.422456

Cost-effective digital coherent short-reach transmission system
© 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
Final published version, 3.55 MBLicence: Other

Cite this

@article{c23f032d48c5415d95cc30ca3ce72b92,

title = "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.",

author = "Tingting Zhang and Qian Xiang and Sen Zhang and Lei Liu and Stylianos Sygletos and Tianjian Zuo",

note = "{\textcopyright} 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement",

year = "2021",

month = apr,

day = "12",

doi = "10.1364/OE.422456",

language = "English",

volume = "29",

pages = "11892--11902",

journal = "Optics Express",

issn = "1094-4087",

publisher = "The Optical Society",

number = "8",

}

TY - JOUR

T1 - Cost-effective digital coherent short-reach transmission system with D8QAM and low-complexity DSP

AU - Zhang, Tingting

AU - Xiang, Qian

AU - Zhang, Sen

AU - Liu, Lei

AU - Sygletos, Stylianos

AU - Zuo, Tianjian

PY - 2021/4/12

Y1 - 2021/4/12

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=85104511911&partnerID=8YFLogxK

UR - https://www.osapublishing.org/oe/fulltext.cfm?uri=oe-29-8-11892&id=449780

U2 - 10.1364/OE.422456

DO - 10.1364/OE.422456

M3 - Article

AN - SCOPUS:85104511911

SN - 1094-4087

VL - 29

SP - 11892

EP - 11902

JO - Optics Express

JF - Optics Express

IS - 8

ER -

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

Abstract

Bibliographical note

Access to Document

Other files and links

Fingerprint

Cite this