Kramers-Kronig relation based direct detection for unrepeated long-haul lightwave transmission

Enzo Tsukui; Kentaro Toba; Takaha Fujita; K.I. Amila Sampath; Joji Maeda

doi:10.1587/comex.2021ETL0028

Special Cluster on Advanced Communication Technologies in Conjunction with Main Topics of ICETC2020

Kramers-Kronig relation based direct detection for unrepeated long-haul lightwave transmission

Enzo Tsukui, Kentaro Toba, Takaha Fujita, K.I. Amila Sampath, Joji Maeda

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Keywords: optical fiber communication, fiber transmission, self-coherent heterodyne, modulation, direct-detection

JOURNAL FREE ACCESS

2021 Volume 10 Issue 8 Pages 516-521

DOI https://doi.org/10.1587/comex.2021ETL0028

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Abstract

We numerically study transmission limitations of an unrepeated optical link using Kramers-Kronig (KK) relation-based direct detection. The transmission distance is limited by the thermal noise of the optical front-end and the signal distortions caused by fiber nonlinearity in optical amplifier-free transmission and by amplified spontaneous emission (ASE) noise and fiber nonlinearities when pre-amplification is enabled at the receiver. The transmission limits of QPSK, 16-QAM, and 64-QAM modulation formats in optical amplifier-free 25-GBaud transmission can be extended from 109, 80, and 52 km to 186, 134, and 90 km by enabling pre-amplification at the receiver, respectively.

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