no code implementations • 7 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.
no code implementations • 15 Nov 2022 • 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.
no code implementations • 21 Sep 2022 • Kenya Suzuki, Osamu Moriwaki, Koichi Hadama, Keita Yamaguchi, Hiroki Taniguchi, Yoshiaki Kisaka, Daisuke Ogawa, Makoto Takeshita, Stefano Camatel, Yiran Ma, Mitsunori Fukutoku
The operation in C+L bands requires switch devices used in CDC-ROADM to also be capable of multiband operation.
no code implementations • 4 Jun 2021 • Shuto Yamamoto, Hiroki Taniguchi, Yoshiaki Kisaka, Stefano Camatel, Yiran Ma, Daisuke Ogawa, Koichi Hadama, Mitsunori Fukutoku, Takashi Goh, Kenya Suzuki
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 arranged in a band because of their wider bandwidth.
no code implementations • 13 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).
no code implementations • 15 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.
no code implementations • 15 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.