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800-Gb/s/carrier WDM Coherent Transmission Over 2000 km Based on Truncated PS-64QAM Utilizing MIMO Volterra Equalizer

We provided a feasible solution for 800-Gb/s per carrier long-distance wavelength division multiplexing (WDM) coherent optical fibre transmission based on offline DSP. We experimentally demonstrate 5-carrier 125-GHz-spacing WDM coherent optical fibre transmission achieving 2000-km transmission distance and 800-Gb/s net bit rate per carrier. We utilized 100-Gbaud truncated probabilistically shaped (TPS) polarization-multiplexed 64QAM format in this work. In terms of advanced components, the high-speed digital-to-analog converter with 35-GHz 3 dB-bandwidth and Raman-amplified ultra-large-area fibre were utilized to achieve higher baud-rate and longer transmission distance. In terms of modulation format, we changed PS to TPS to obtain a more suitable shaping depth, and make the shaped signal better suited to the DSP process of coherent optical communication, including constant modulus algorithm (CMA) equalizer. Besides, our results show that the TPS-64QAM signal with 5-bit/symbol/polarization entropy outperforms the standard-32QAM with a same bit rate by around 1 dB sensitivity gain. Furthermore, we proposed a multiple-input multiple-output (MIMO) Volterra equalizer (VE), which consists of a 1 st -order 2 × 2 MIMO complex-valued widely linear (WL) equalizer and a 2 nd -order real-valued nonlinear equalizer. Our proposed MIMO VE can effectively resolve the impact of In-phase/quadrature (IQ) imbalance and IQ skew, and compensate linear and nonlinear impairments at the same time. We also utilized partial kernel VE to reduce the complexity by retaining part of the 2 nd -order kernels.

Ketersediaan

Informasi Detail

Judul Seri

JOURNAL OF LIGHTWAVE TECHNOLOGY; Vol.40 No.9 May 1 2022

No. Panggil

-

Penerbit

: .,

Deskripsi Fisik

p. 2830-2839

Bahasa

English

ISBN/ISSN

-

Klasifikasi

NONE

Tipe Isi

-

Tipe Media

-

Tipe Pembawa

-

Edisi

-

Subjek

RAMAN AMPLIFIER
COMPLEX-VALUED WIDELY LINEAR EQUALIZER
HIGH-SPEED DIGITAL-TO-ANALOG CONVERTER
MULTIPLE-INPUT MULTIPLE-OUTPUT VOLTERRA EQUALIZER
PARTIAL KERNEL VE
TRUNCATED PS TECHNIQUE
ULTRA-LARGE-AREA FIBRE

Info Detail Spesifik

DOI: 10.1109/JLT.2022.3148336

Pernyataan Tanggungjawab

Miao Kong, Junting Shi, Bohan Sang, Junjie Ding, Kaihui Wang, Weiping Li, Feng Wang, Cuiwei Liu, Yanyi Wang, Yiran Wei, Bowen Zhu, Li Zhao, Wen Zhou, Jianjun Yu

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