IQ-code for PDL and Crosstalk Mitigation in Nyquist-WDM Transmission based on DSC

• Published in: Journal of lightwave technology pp. 1 - 9
• Main Authors: Abouseif, Akram, Klaimi, Rami, Othman, Ghaya Rekaya-Ben, Jaouen, Yves, Darweesh, Jamal
• Format: Journal Article
• Language: English
• Published: IEEE 07-08-2024
• Subjects: Codes; Fiber optics communications; MIMO; Nyquist-WDM; Optical fiber dispersion; Optical fiber polarization; Optical fibers; Optical polarization; Optical transmitters; Superchannel; Wavelength division multiplexing
• ISSN: 0733-8724; 1558-2213
• DOI: 10.1109/JLT.2024.3440399

Nyquist wavelength-division-multiplexing transmission based on digital sub-carrier, emerges as a promising solution to address the growing network traffic demand. However, this system is impacted by the crosstalk between sub-bands resulting from laser drift. In addition, the transmission capacity is restricted by polarization-dependent loss (PDL), which classical digital signal processing (DSP) techniques at the receiver side are not able to mitigate. In this work, we propose a digital multiple-input-multiple-output coding technique, labelled as IQ-code, aimed at enhancing transmission performance in dual polarized wavelength-division multiplexing (WDM) systems affected by PDL . Furthermore, it demonstrates resilience against crosstalk and non-linearity. A key advantage lies in the use of a single time interval, reducing decoding complexity compared to alternative spatial coding techniques. Our findings demonstrate versatility across various sub-bands, achieving notable improvements up to 1.5 dB gain in different scenarios over a transmission distance of 1000 Km.