Turbo DFE Assisted Time-Frequency Packing for Probabilistically Shaped Terabit Superchannels

We present a probabilistically shaped (PS) time-frequency-packing (TFP) wavelength-division multiplexing superchannel system employing higher order modulation (HoM) formats, with an objective to improve the spectral efficiency (SE). However, TFP systems suffer from inter-symbol interference (ISI) an...

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Autores principales:	Mrinmoy Jana, Lutz Lampe, Jeebak Mitra
Formato:	article
Lenguaje:	EN
Publicado:	IEEE 2021
Materias:	Faster-than-Nyquist (FTN) time-frequency packing (TFP) probabilistic shaping (PS) decision feedback equalization (DFE) expectation propagation (EP) superchannel Applied optics. Photonics TA1501-1820 Optics. Light QC350-467
Acceso en línea:	https://doaj.org/article/cd714cf1ad5349e391c9bb6ebe071377
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spelling	oai:doaj.org-article:cd714cf1ad5349e391c9bb6ebe0713772021-11-18T00:00:09ZTurbo DFE Assisted Time-Frequency Packing for Probabilistically Shaped Terabit Superchannels1943-065510.1109/JPHOT.2021.3123810https://doaj.org/article/cd714cf1ad5349e391c9bb6ebe0713772021-01-01T00:00:00Zhttps://ieeexplore.ieee.org/document/9594678/https://doaj.org/toc/1943-0655We present a probabilistically shaped (PS) time-frequency-packing (TFP) wavelength-division multiplexing superchannel system employing higher order modulation (HoM) formats, with an objective to improve the spectral efficiency (SE). However, TFP systems suffer from inter-symbol interference (ISI) and/or inter-carrier interference (ICI). Additionally, the bandwidth limitations of the wavelength selective switches in the fiber link may cause severe ISI for the edge sub-channels (SCs) in a superchannel. Mitigation of such interferences is particularly challenging for HoM systems, since the implementation of the well-known turbo equalization schemes, such as the Bahl-Cocke-Jelinek-Raviv equalizer, is computationally challenging for larger constellations. In this paper, we investigate an expectation propagation based, computationally efficient, turbo decision feedback equalizer for ISI cancellation, in tandem with a parallel interference cancellation based ICI mitigation. By optimizing the parameters in the shaping and the packing dimensions, we show through our numerical results that the proposed PS-TFP superchannels enabling 1.8 Tbps data rates offer up to 1.05 dB packing gain over an unpacked system using the same modulation format, and a 1.15 dB shaping gain over an unshaped system that uses a lower modulation order to achieve the same SE.Mrinmoy JanaLutz LampeJeebak MitraIEEEarticleFaster-than-Nyquist (FTN)time-frequency packing (TFP)probabilistic shaping (PS)decision feedback equalization (DFE)expectation propagation (EP)superchannelApplied optics. PhotonicsTA1501-1820Optics. LightQC350-467ENIEEE Photonics Journal, Vol 13, Iss 6, Pp 1-6 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Faster-than-Nyquist (FTN) time-frequency packing (TFP) probabilistic shaping (PS) decision feedback equalization (DFE) expectation propagation (EP) superchannel Applied optics. Photonics TA1501-1820 Optics. Light QC350-467
spellingShingle	Faster-than-Nyquist (FTN) time-frequency packing (TFP) probabilistic shaping (PS) decision feedback equalization (DFE) expectation propagation (EP) superchannel Applied optics. Photonics TA1501-1820 Optics. Light QC350-467 Mrinmoy Jana Lutz Lampe Jeebak Mitra Turbo DFE Assisted Time-Frequency Packing for Probabilistically Shaped Terabit Superchannels
description	We present a probabilistically shaped (PS) time-frequency-packing (TFP) wavelength-division multiplexing superchannel system employing higher order modulation (HoM) formats, with an objective to improve the spectral efficiency (SE). However, TFP systems suffer from inter-symbol interference (ISI) and/or inter-carrier interference (ICI). Additionally, the bandwidth limitations of the wavelength selective switches in the fiber link may cause severe ISI for the edge sub-channels (SCs) in a superchannel. Mitigation of such interferences is particularly challenging for HoM systems, since the implementation of the well-known turbo equalization schemes, such as the Bahl-Cocke-Jelinek-Raviv equalizer, is computationally challenging for larger constellations. In this paper, we investigate an expectation propagation based, computationally efficient, turbo decision feedback equalizer for ISI cancellation, in tandem with a parallel interference cancellation based ICI mitigation. By optimizing the parameters in the shaping and the packing dimensions, we show through our numerical results that the proposed PS-TFP superchannels enabling 1.8 Tbps data rates offer up to 1.05 dB packing gain over an unpacked system using the same modulation format, and a 1.15 dB shaping gain over an unshaped system that uses a lower modulation order to achieve the same SE.
format	article
author	Mrinmoy Jana Lutz Lampe Jeebak Mitra
author_facet	Mrinmoy Jana Lutz Lampe Jeebak Mitra
author_sort	Mrinmoy Jana
title	Turbo DFE Assisted Time-Frequency Packing for Probabilistically Shaped Terabit Superchannels
title_short	Turbo DFE Assisted Time-Frequency Packing for Probabilistically Shaped Terabit Superchannels
title_full	Turbo DFE Assisted Time-Frequency Packing for Probabilistically Shaped Terabit Superchannels
title_fullStr	Turbo DFE Assisted Time-Frequency Packing for Probabilistically Shaped Terabit Superchannels
title_full_unstemmed	Turbo DFE Assisted Time-Frequency Packing for Probabilistically Shaped Terabit Superchannels
title_sort	turbo dfe assisted time-frequency packing for probabilistically shaped terabit superchannels
publisher	IEEE
publishDate	2021
url	https://doaj.org/article/cd714cf1ad5349e391c9bb6ebe071377
work_keys_str_mv	AT mrinmoyjana turbodfeassistedtimefrequencypackingforprobabilisticallyshapedterabitsuperchannels AT lutzlampe turbodfeassistedtimefrequencypackingforprobabilisticallyshapedterabitsuperchannels AT jeebakmitra turbodfeassistedtimefrequencypackingforprobabilisticallyshapedterabitsuperchannels
_version_	1718425317709709312

Turbo DFE Assisted Time-Frequency Packing for Probabilistically Shaped Terabit Superchannels

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