Nonlinear equalizer for spectral efficient IM/DD FBMC/OQAM transmission system

Yang Fei; Meixia Li; Lichen Jia; Jiamin Chu; Mingyi Gao

doi:10.1117/12.3023723

18 March 2024 Nonlinear equalizer for spectral efficient IM/DD FBMC/OQAM transmission system

Yang Fei, Meixia Li, Lichen Jia, Jiamin Chu, Mingyi Gao

Proceedings Volume 13104, Advanced Fiber Laser Conference (AFL2023); 1310460 (2024) https://doi.org/10.1117/12.3023723
Event: Advanced Fiber Laser Conference (AFL2023), 2023, Shenzhen, China

Abstract

Multi-carrier modulation is attractive for high-speed passive optical network. However, for a given system, its capacity is limited by the system bandwidth and the number of effective data subcarriers. With the increase of the baud rate and the number of data subcarriers, the signal distortion becomes serious. In this work, we propose a nonlinear equalizer (NLE), mainly composed of a 2-order Volterra filter and a complex-valued neural network channel estimator, to mitigate the severe signal distortion. We experimentally demonstrate and evaluate it in a spectral efficient 12.5/25-GBd intensity modulation direct detection filter bank multicarrier with offset quadrature amplitude modulation (FBMC/OQAM) transmission system with the 10-dB bandwidth of 9.6-GHz over 30-km standard single mode fiber. In the 12.5-GBd FBMC/OQAM transmission, when the number of the data subcarriers is increased to 448 with the total 512 subcarriers, the proposed NLE outperforms the linear equalizer (LE) and can achieve about 2-dB receiver sensitivity improvement at 3.8×10^-3 bit error ratio (BER), the hard decision forward error correction (HD-FEC) threshold. When the symbol rate is increased to 25-GBd, the number of data subcarriers is limited to 256 because of the power fading of high-frequency components, the LE cannot recover the distorted signal well, while the proposed NLE can still achieve better BER performance.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Yang Fei, Meixia Li, Lichen Jia, Jiamin Chu, and Mingyi Gao "Nonlinear equalizer for spectral efficient IM/DD FBMC/OQAM transmission system", Proc. SPIE 13104, Advanced Fiber Laser Conference (AFL2023), 1310460 (18 March 2024); https://doi.org/10.1117/12.3023723

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available