Search Results for author: Masanori Nakamura

Found 4 papers, 0 papers with code

Linear Least Squares Estimation of Fiber-Longitudinal Optical Power Profile

no code implementations7 Oct 2023 Takeo Sasai, Minami Takahashi, Masanori Nakamura, Etsushi Yamazaki, Yoshiaki Kisaka

This paper presents a linear least squares method for fiber-longitudinal power profile estimation (PPE), which estimates an optical signal power distribution throughout a fiber-optic link at a coherent receiver.

Physics-oriented learning of nonlinear Schrödinger equation: optical fiber loss and dispersion profile identification

no code implementations13 Apr 2021 Takeo Sasai, Masanori Nakamura, Etsushi Yamazaki, Shuto Yamamoto, Hideki Nishizawa, Yoshiaki Kisaka

In optical fiber communication, system identification (SI) for the nonlinear Schr\"odinger equation (NLSE) has long been studied mainly for fiber nonlinearity compensation (NLC).

Management

Laser Phase Noise Tolerance of Uniform and Probabilistically-shaped QAM Signals for High Spectral Efficiency Systems

no code implementations15 Dec 2020 Takeo Sasai, Asuka Matsushita, Masanori Nakamura, Seiji Okamoto, Fukutaro Hamaoka, Yoshiaki Kisaka

Results reveal that PS-1024QAM achieves high performance with the 0. 1 kHz-laser or > 5% pilot ratio, whereas US-256QAM outperforms PS-1024QAM when lasers with 40-kHz linewidth and < 5% pilot ratio are used.

Wiener-Hammerstein model and its learning for nonlinear digital pre-distortion of optical transmitters

no code implementations15 Dec 2020 Takeo Sasai, Masanori Nakamura, Etsushi Yamazaki, Asuka Matsushita, Seiji Okamoto, Kengo Horikoshi, Yoshiaki Kisaka

We present a simple nonlinear digital pre-distortion (DPD) of optical transmitter components, which consists of concatenated blocks of a finite impulse response (FIR) filter, a memoryless nonlinear function and another FIR filter.

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