140G/70G Direct Detection PON with&gt;37 dB Power Budget and 40-km Reach Enabled by Colorless Phase Retrieval Full Field Recovery

Chen, H.; Fontaine, Nicolas K.; Mazur, Mikael; Dallachiesa, Lauren; Zhang, Yuxiang; Huang, Hung-Lung; Veen, Doutje van; Houtsma, Vincent; Blanco‐Redondo, Andrea; Ryf, Roland; Neilson, David T.

doi:10.1109/ecoc52684.2021.9605860

Cited by 11 publications

(3 citation statements)

References 19 publications

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“…To determine the complexity of the ECA-GS scheme, C ECA-GS , we refer to implementation described in Ref. [47], which uses overlap-save processing with a 50% save ratio to enable block-wise phase retrieval with a block-size of 1024. The GS iterations are the most computationally intensive part of the ECA-GS scheme, and, therefore, we neglect the complexity associated with SSB filtering, upsampling and downsampling to determine the complexity expression.…”

Section: B Complexity Of the Eca-gs Schemementioning

confidence: 99%

Edge-Carrier-Assisted Phase Retrieval at Low-CSPR and Low-Dispersion Diversity With Deep Learning

Orsuti,

Santagiustina,

Galtarossa

et al. 2024

J. Lightwave Technol.

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We investigate the performance of deep learning in recovering the complex-valued field of a weak-carrier-assisted single side-band signal from two intensity measurements that are decorrelated by dispersion. The proposed scheme relies on a supervised learning-based convolutional neural network to map the intensity measurements to the full-field. Unlike conventional iterative phase retrieval schemes, the proposed scheme does not require any iterations, digital upsampling, or pilot symbols, and can operate both at low carrier-to-signal-power ratio (CSPR) and at low applied dispersion value. Through numerical simulations in relevant system settings, we compare the performance of the proposed scheme with two recently proposed carrier-assisted iterative phase retrieval schemes: one based on the solution of a nonlinear optimization problem, and the other based on a modified Gerchberg-Saxton algorithm. The results show that the proposed scheme complies with the 7% hard-decision forward error correction threshold after 24 GBaud 32-QAM transmission over 100 km of standard single-mode fiber at a CSPR of 0 dB, with 3.6 times lower applied dispersion value, 30% to 90% lower complexity, and with less than 2 dB sensitivity penalty compared to conventional iterative phase retrieval schemes. These results support the potential of deep learning to realize phase retrieval-based coherent receivers that are compatible with the low complexity requirements of short-reach optical networks.

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Section: B Complexity Of the Eca-gs Schemementioning

confidence: 99%

Edge-Carrier-Assisted Phase Retrieval at Low-CSPR and Low-Dispersion Diversity With Deep Learning

Orsuti,

Santagiustina,

Galtarossa

et al. 2024

J. Lightwave Technol.

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“…In addition, the ONU transmitter is typically not wavelength-stable (λ-stable) due to it being bursted [259]. The first challenge has been addressed in [260], where a colorless phase-retrieval full-field recovery technique was proposed to avoid the wavelength-alignment requirement at the cost of no coherent amplification. In [261], frequency-comb lasers were proposed to enable quasi-colorless coherent detection but with coherent amplification.…”

Section: Current and Future Challengesmentioning

confidence: 99%

Roadmap on optical communications

Agrell,

Karlsson,

Poletti

et al. 2024

J. Opt.

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The Covid-19 pandemic showed forcefully the fundamental importance broadband data communication and the internet has in our society. Optical communications forms the undisputable backbone of this critical infrastructure, and it is supported by an interdisciplinary research community striving to improve and develop it further. Since the first ‘Roadmap of optical communications’ was published in 2016, the field has seen significant progress in all areas, and time is ripe for an update of the research status. The optical communications area has become increasingly diverse, covering research in fundamental physics and materials science, high-speed electronics and photonics, signal processing and coding, and communication systems and networks. This roadmap describes state-of-the-art and future outlooks in the optical communications field. The article is divided into 20 sections on selected areas, each written by a leading expert in that area. The sections are thematically grouped into four parts with 4–6 sections each, covering, respectively, hardware, algorithms, networks and systems. Each section describes the current status, the future challenges, and development needed to meet said challenges in their area. As a whole, this roadmap provides a comprehensive and unprecedented overview of the contemporary optical communications research, and should be essential reading for researchers at any level active in this field.

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“…The ITU-T Q2/SG15 has also already committed to the standardization of a higher line rate of 50 Gb/s [ 3 ]. At C-band, more complex digital signal processing (DSP) is required to achieve high-speed transmission based on direct detection due to high fiber chromatic dispersion (CD) [ 4 ]. O-band is a better choice in both high-speed PON downstream and upstream links because its lower CD helps to overcome inter-symbol interference (ISI) [ 5 ], and it has been successfully selected as the downstream wavelength of 50G time division multiplexed PON (TDM-PON) [ 6 ].…”

Section: Introductionmentioning

confidence: 99%

SOA Amplified 100 Gb/s/λ PAM-4 TDM-PON Supporting PR-30 Power Budget with >18 dB Dynamic Range

Luo

et al. 2022

Micromachines

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Semiconductor optical amplifier (SOA) is considered an excellent candidate for power amplification at O-band due to its low cost and small footprint. In passive optical networks (PONs), SOA is popular as a booster and pre-amplifier to improve the link power budget. However, whether as a booster or pre-amplifier, SOA will induce different degrees of nonlinearity when the output power is high, which degrades the transmission performance of the system and leads to a limited receiver dynamic range. In this paper, we experimentally demonstrate the feasibility of using SOA in both transmitter and receiver sides for power budget improvement in 100 Gb/s/λ four-level pulsed amplitude modulation (PAM-4) time division multiplexed PON (TDM-PON) system at O-band. For compensating the linear and nonlinear impairments induced by transceivers and SOA, a look-up-table (LUT) pre-compensation at the optical line terminal (OLT) side and a simple feed-forward equalizer (FFE) at the optical network unit (ONU) side are adopted for downstream transmission. For upstream transmission, a 2nd-order Volterra nonlinear equalizer (VNLE) is utilized at the OLT side, and no pre-compensation is used at the transmitter of the ONU, which releases the digital signal processing (DSP) pressure of ONUs in a multi-user scenario. For the soft-decision FEC (SD-FEC) threshold (1 × 10−2), the IEEE PR-30 power budget requirement is met, and >18 dB dynamic range is achieved in both 25 km downstream and upstream transmission.

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140G/70G Direct Detection PON with>37 dB Power Budget and 40-km Reach Enabled by Colorless Phase Retrieval Full Field Recovery

Cited by 11 publications

References 19 publications

Edge-Carrier-Assisted Phase Retrieval at Low-CSPR and Low-Dispersion Diversity With Deep Learning

Edge-Carrier-Assisted Phase Retrieval at Low-CSPR and Low-Dispersion Diversity With Deep Learning

Roadmap on optical communications

SOA Amplified 100 Gb/s/λ PAM-4 TDM-PON Supporting PR-30 Power Budget with >18 dB Dynamic Range

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