76 citations · 230 across the 7 of their papers we have counts for
7 papers
Linear Least Squares Estimation of Fiber-Longitudinal Optical Power Profile
Takeo Sasai, Minami Takahashi, Masanori Nakamura +2
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-opt…
Performance Limit of Fiber-Longitudinal Power Profile Estimation Methods
Takeo Sasai, Etsushi Yamazaki, Yoshiaki Kisaka
This paper presents analytical results on longitudinal power profile estimation (PPE) methods, which visualize signal power evolution in optical fibers at a coherent receiver. The…
A Transponder Aggregator with Efficient Use of Filtering Function for Transponder Noise Suppression
Kenya Suzuki, Osamu Moriwaki, Koichi Hadama +8
Colorless, directionless, and contentionless reconfigurable optical add/drop multiplexing (CDC-ROADM) provides highly flexible physical layer network configuration. Such CDC-ROADM…
First demonstration of C + L band CDCROADM with simple node configuration using multiband switching devices
Shuto Yamamoto, Hiroki Taniguchi, Yoshiaki Kisaka +7
While ultrahigh-baud-rate optical signals are effective for extending the transmission distance of large capacity signals, they also reduce the number of wavelengths that can be ar…
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…