Search Results - "Nakashima, Hisao"

Improvements to Digital Carrier Phase Recovery Algorithm for High-Performance Optical Coherent Receivers by Zhenning Tao, Lei Li, Ling Liu, Weizhen Yan, Nakashima, Hisao, Tanimura, Takahito, Oda, Shoichiro, Hoshida, Takeshi, Rasmussen, Jens C

“…The Viterbi-and-Viterbi (V-V) algorithm is widely used to recover the carrier phase in optical digital coherent receivers. For simplicity, the basic V-V…”
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Transceiver Imbalances Compensation and Monitoring by Receiver DSP by Liang, Junpeng, Fan, Yangyang, Tao, Zhenning, Su, Xiaofei, Nakashima, Hisao

“…In-phase and quadrature (IQ) imbalances in optical transceiver, such as amplitude imbalance, phase imbalance, and IQ skew, can cause serious system performance…”
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240 GBd PDM-16QAM Single-Carrier Coherent Transmission beyond 130 km SSMF for a Bandwidth Limited System with Low Power Consumption DSP by Huang, Guoxiu, Nakamura, Yo, Nakashima, Hisao, Hoshida, Takeshi

“…In this paper, the novel and simple transceiver digital signal processing for a coherent system with Tomlinson-Harashima pre-coding was proposed and digitally…”
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Performance Evaluation of WDM Channel Transmission for Probabilistic Shaping With Partial Multilevel Coding by Sugitani, Kiichi, Koganei, Yohei, Irie, Hiroyuki, Nakashima, Hisao

“…We propose partial multilevel coding (MLC) for optical communications with probabilistic shaping (PS), which improves the signal-to-noise ratio performance and…”
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Multilevel Coding With Spatially Coupled Repeat-Accumulate Codes for High-Order QAM Optical Transmission by Koganei, Yohei, Oyama, Tomofumi, Sugitani, Kiichi, Nakashima, Hisao, Hoshida, Takeshi

“…We propose multilevel coding (MLC) with spatially coupled codes to increase the net coding gain (NCG) and reduce the power consumption of forward error…”
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Characterization of Nonlinear Distortion in Intensity Modulation and Direct Detection Systems by Li, Jingnan, Su, Xiaofei, Ye, Tong, Nakashima, Hisao, Hoshida, Takeshi, Tao, Zhenning

“…Intensity modulation and direct detection (IM-DD) systems are widely used in short-reach optical networks. Thus, developing a practical and accurate method to…”
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Characterization, Measurement and Specification of Device Imperfections in Optical Coherent Transceivers by Tao, Zhenning, Fan, Yangyang, Su, Xiaofei, Zhang, Ke, Yang, Chengwu, Ye, Tong, Li, Jingnan, Nakashima, Hisao, Hoshida, Takeshi

“…Transceiver imperfections become the primary source of impairment as baud rate and modulation order grow in advanced optical coherent communications. Thus,…”
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Transmission Electron Microscopy and Photoluminescence Characterization of InAs Quantum Wires on Vicinal GaAs(110) Substrates by Molecular Beam Epitaxy by Satoshi Torii, Satoshi Torii, Kazuki Bando, Kazuki Bando, Byoung-Rho Shim, Byoung-Rho Shim, Kenzo Maehashi, Kenzo Maehashi, Hisao Nakashima, Hisao Nakashima

“…InAs quantum wires have been naturally formed on vicinal GaAs(110) surfaces with giant steps by molecular beam epitaxy. Transmission electron microscope…”
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Annealing effect on InAs islands on GaAs(0 0 1) substrates studied by scanning tunneling microscopy by Suekane, Osamu, Hasegawa, Shigehiko, Tanaka, Masakazu, Okui, Toshiko, Nakashima, Hisao

“…Post-annealing effects on InAs islands grown on GaAs(0 0 1) surfaces have been investigated by scanning tunneling microscopy (STM) connected to molecular beam…”
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Fast optical channel recovery in field demonstration of 100-Gbit/s Ethernet over OTN using real-time DSP by Yamazaki, Etsushi, Yamanaka, Shogo, Kisaka, Yoshiaki, Nakagawa, Tadao, Murata, Koichi, Yoshida, Eiji, Sakano, Toshikazu, Tomizawa, Masahito, Miyamoto, Yutaka, Matsuoka, Shinji, Matsui, Junichiro, Shibayama, Atsufumi, Abe, Jun-ichi, Nakamura, Yuichi, Noguchi, Hidemi, Fukuchi, Kiyoshi, Onaka, Hiroshi, Fukumitsu, Katsumi, Komaki, Kousuke, Takeuchi, Osamu, Sakamoto, Yuichiro, Nakashima, Hisao, Mizuochi, Takashi, Kubo, Kazuo, Miyata, Yoshikuni, Nishimoto, Hiroshi, Hirano, Susumu, Onohara, Kiyoshi

“…A field trial of 100-Gbit/s Ethernet over an optical transport network (OTN) is conducted using a real-time digital coherent signal processor. Error free…”
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Electronic structures of porous Si studied by core-level absorption and photoemission spectroscopy by INOUE, K, MAEHASHI, K, NAKASHIMA, H

“…For the investigation of the electronic structures of porous Si, 2p core-level absorption and photoemission spectra are measured with synchrotron radiation…”
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Formation and characterization of GaAs quantum wires at giant step edges on vicinal (110) GaAs surfaces by TAKEUCHI, M, SHIBA, K, SATO, K, HU KUN HUANG, INOUE, K, NAKASHIMA, H

“…We report the formation of GaAs quantum wires using giant step structure formed during molecular beam epitaxial growth of AlGaAs on vicinal (110) GaAs…”
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Precise Formation of Fine Pits on Birefringent Film for Multilevel Optical Data Storage by Haeiwa, Hirofumi, Nakashima, Hisao, Kokubun, Yasuo, Masaki, Akira, Toyooka, Takehiro

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Stacked GaAs multi-quantum wires grown on vicinal GaAs(110) surfaces by molecular beam epitaxy by Kato, Takehiko, Takeuchi, Toshikazu, Inoue, Yoshiji, Hasegawa, Shigehiko, Inoue, Koichi, Nakashima, Hisao

“…Stacked GaAs quantum wires (QWRs) are grown on the surfaces with giant steps which are naturally formed on vicinal GaAs(110) substrates by molecular beam…”
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Charge-balanced heteroepitaxial growth of GaAs on Si by MAEHASHI, K, HASEGAWA, S, NAKASHIMA, H

“…We propose charge-balanced heteroepitaxy, where the GaAs/Si interface is neutralized by inserting one monolayer of column II elements in place of the Ga atoms…”
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Formation of InAs wires and dots on vicinal GaAs (110) surfaces with giant steps by molecular beam epitaxy by TORII, S, SHIM, B.-R, YASUDA, H, MAEHASHI, K, HASEGAWA, S, NAKASHIMA, H

“…InAs are grown on vicinal GaAs (110) surfaces with giant steps using molecular beam epitaxy. Atomic force microscopy, X-ray photoelectron spectroscopy and…”
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Scanning tunneling microscopy study of the hydrogen-terminated n- and p-type Si(001) surfaces by Fukutome, Hidenobu, Takano, Keizo, Yasuda, Haruyuki, Maehashi, Kenzo, Hasegawa, Shigehiko, Nakashima, Hisao

“…We have investigated hydrogen-passivated Si(001) surfaces with various doping conditions using X-ray photoelectron spectroscopy (XPS), scanning tunneling…”
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Growth Temperature Dependence of InAs Islands Grown on GaAs (001) Substrates by Suekane, Osamu, Hasegawa, Shigehiko, Okui, Toshiko, Takata, Masahiro, Nakashima, Hisao

“…STM in conjunction with MBE has been used to investigate InAs islands and wetting layers on GaAs(001) substrates. STM results reveal that the size, density and…”
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Nonlinear noise spectrum measurement using a probability-maintained noise power ratio method by Ye, Tong, Su, Xiaofei, Zhang, Ke, Yang, Chengwu, Li, Jingnan, Fan, Yangyang, Nakashima, Hisao, Hoshida, Takeshi, Tao, Zhenning

“…Nonlinear distortion (noise) limits many communication systems, demanding a means of estimating system performance via device nonlinear characteristics. The…”
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Micro-photoluminescence spectroscopy of single (Al, Ga)As quantum wires grown on vicinal GaAs ( [formula omitted]) surfaces by Ota, Takeshi, Maehashi, Kenzo, Christen, Jürgen, Oto, Kenichi, Murase, Kazuo, Nakashima, Hisao

“…Single AlGaAs and GaAs quantum wires (QWRs) have been investigated by micro-photoluminescence (micro-PL). The micro-PL spectra of the GaAs QWR reveal that the…”
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