69 citations · 169 across the 12 of their papers we have counts for
5 papers · 1 filter
Optical Link Tomography: First Field Trial and 4D Extension
Takeo Sasai, Giacomo Borraccini, Yue-Kai Huang +11
Optical link tomography (OLT) is a rapidly evolving field that allows the multi-span, end-to-end visualization of optical power along fiber links in multiple dimensions from networ…
Design of Fiber-Longitudinal Optical Power Monitor
Takeo Sasai, Sze Yun Set, Shinji Yamashita
This paper presents analytical results on the accuracy of fiber-longitudinal optical power monitoring (LPM) at arbitrary positions. To quantify the accuracy, the position-wise vari…
Physics-oriented learning of nonlinear Schrödinger equation: optical fiber loss and dispersion profile identification
Takeo Sasai, Masanori Nakamura, Etsushi Yamazaki +3
In optical fiber communication, system identification (SI) for the nonlinear Schrödinger equation (NLSE) has long been studied mainly for fiber nonlinearity compensation (NLC). One…
Laser Phase Noise Tolerance of Uniform and Probabilistically-shaped QAM Signals for High Spectral Efficiency Systems
Takeo Sasai, Asuka Matsushita, Masanori Nakamura +3
We numerically and experimentally investigate the laser phase noise tolerance of probabilistically shaped (PS) and uniformly shaped (US) quadrature amplitude modulation (QAM) signa…
Wiener-Hammerstein model and its learning for nonlinear digital pre-distortion of optical transmitters
Takeo Sasai, Masanori Nakamura, Etsushi Yamazaki +4
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 mem…