Probabilistic Shaping for High-Speed Unamplified IM/DD Systems With an O-Band EML

Article Optics

Net 400-Gbps/? IMDD transmission using a single-DAC DSP-free transmitter and a thin-film lithium niobate MZM

Essam Berikaa et al.

Summary: This Letter demonstrates the first single-DAC IMDD system achieving a net 400-Gbps transmission using a TFLN MZM, highlighting the potential for running high-speed links with reduced DSP complexity and driving swing requirements.

OPTICS LETTERS (2022)

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Article Optics

Net 400-Gbps/λ IMDD transmission using a single-DAC DSP-free transmitter and a thin-film lithium niobate MZM

Essam Berikaa et al.

Summary: This study demonstrates a single digital-to-analog converter intensity modulation direct detection (IMDD) system using a thin-film lithium niobate Mach-Zehnder modulator (MZM) to achieve a high-speed transmission of 400 Gbps. By transmitting 128 Gbaud PAM16 and 128 Gbaud probabilistically shaped (PS)-PAM16 without pulse shaping or pre-emphasis filtering, the net rates of 410 Gbps and 400 Gbps were achieved respectively, showcasing the potential of operating 400 Gbps IMDD links with reduced complexity.

OPTICS LETTERS (2022)

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Article Engineering, Electrical & Electronic

Probabilistically Shaped 4-PAM for Short-Reach IM/DD Links With a Peak Power Constraint

Thomas Wiegart et al.

Summary: This study discusses probabilistic shaping for intensity modulation and direct detection links, introducing a peak power constraint determined by the limited modulation extinction ratio of optical modulators. It optimizes the input distribution of 4-ary unipolar pulse amplitude modulation symbols for short-reach transmission links, demonstrating significant gains in both an additive white Gaussian noise channel and a fiber channel.

JOURNAL OF LIGHTWAVE TECHNOLOGY (2021)

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Article Engineering, Electrical & Electronic

Does Probabilistic Constellation Shaping Benefit IM-DD Systems Without Optical Amplifiers?

Di Che et al.

Summary: This paper provides a comprehensive investigation of PCS in IM-DD systems without optical amplifiers, revealing that under certain conditions, a PPC system can be partially or even fully converted to an APC system, allowing the advantages of PCS technology to be realized.

JOURNAL OF LIGHTWAVE TECHNOLOGY (2021)

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Proceedings Paper Computer Science, Information Systems

Experimental Comparison of Cap and Cup Probabilistically Shaped PAM for O-Band IM/DD Transmission System

Md Sabbir Bin Hossain et al.

Summary: When comparing uniform PAM-4, 6, and 8 with probabilistic shaped PAM-8 cap and cup variants at 200Gbit/s net rates, it was found that cap-shaped 80GBd PAM-8 outperforms both 72GBd PAM-8 and 83GBd PAM-6 by up to 5.17dB and 2.17dB in receiver sensitivity.

2021 EUROPEAN CONFERENCE ON OPTICAL COMMUNICATION (ECOC) (2021)

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Proceedings Paper Computer Science, Information Systems

402 Gb/s PAM-8 IM/DD O-Band EML Transmission

Md Sabbir Bin Hossain et al.

Summary: In this study, a record gross bit rate of 402 Gb/s PAM-8 transmission was achieved using a single DAC driving an O-band EML. Considering a 15.31% SD-FEC overhead, a net bit rate of 348.62 Gbit/s was successfully demonstrated over 5km SSMF.

2021 EUROPEAN CONFERENCE ON OPTICAL COMMUNICATION (ECOC) (2021)

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Article Engineering, Electrical & Electronic