Search Results - "Sakamaki, Yohei"

Ultra-High Capacity WDM Transmission Using Spectrally-Efficient PDM 16-QAM Modulation and C- and Extended L-Band Wideband Optical Amplification by Sano, Akihide, Masuda, Hiroji, Kobayashi, Takayuki, Fujiwara, Masamichi, Horikoshi, Kengo, Yoshida, Eiji, Miyamoto, Yutaka, Matsui, Munehiro, Mizoguchi, Masato, Yamazaki, Hiroshi, Sakamaki, Yohei, Ishii, Hiroyuki

“…This paper describes ultrahigh capacity transmission based on spectrally-efficient multi-level modulation and wideband optical amplification techniques…”
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Low-Loss Y-Branch Waveguides Designed by Wavefront Matching Method by Sakamaki, Y., Saida, T., Hashimoto, T., Takahashi, H.

“…In this paper, we describe the procedure for designing low-loss Y-branch waveguides by the wavefront matching (WFM) method, and report experimental results as…”
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PMD Vector Estimation Through Time-Resolved Waveform Analysis Based on Ultrafast xy-Field Sampling by Okamoto, K., Okamoto, T., Xinyu Fan, Ito, F., Sakamaki, Y., Hashimoto, T.

“…We show that pulse waveform analysis based on ultrafast xy-field sampling can correctly estimate the complete polarization-mode dispersion (PMD) vector over…”
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Wavelength selective switch array employing silica-based waveguide frontend with integrated polarization diversity optics by Sakamaki, Yohei, Shikama, Kota, Ikuma, Yuichiro, Suzuki, Kenya

“…We propose a waveguide frontend with integrated polarization diversity optics for a wavelength selective switch (WSS) array with a liquid crystal on silicon…”
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Experimental demonstration of multi-degree colorless, directionless, contentionless ROADM for 127-Gbit/s PDM-QPSK transmission system by Sakamaki, Yohei, Kawai, Takeshi, Komukai, Tetsuro, Fukutoku, Mitsunori, Kataoka, Tomoyoshi, Watanabe, Toshio, Ishii, Yuzo

“…We experimentally demonstrate the feasibility of a multi-degree colorless, directionless, and contentionless (C/D/C-less) ROADM node composed of high port…”
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Experimental demonstration of arrayed optical amplifiers with a shared pump laser for realizing colorless, directionless, contentionless ROADM by Sakamaki, Yohei, Kawai, Takeshi, Fukutoku, Mitsunori, Kataoka, Tomoyoshi, Suzuki, Kenya

“…We propose arrayed optical amplifiers that share a single pump laser with the aim of realizing full-add/drop colorless, directionless, contentionless ROADM…”
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64QAM Modulator With a Hybrid Configuration of Silica PLCs and LiNbO 3 Phase Modulators by Yamazaki, Hiroshi, Yamada, Takashi, Goh, Takashi, Sakamaki, Yohei, Kaneko, Akimasa

“…Quadrature amplitude modulation (QAM) is a promising approach for increasing the spectral efficiency of wavelength-division-multiplexing transmission, but its…”
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New Optical Waveguide Design Based on Wavefront Matching Method by Sakamaki, Y., Saida, T., Hashimoto, T., Takahashi, H.

“…We have studied the wavefront matching (WFM) method, which synthesizes optimum waveguide patterns from the desired characteristics, and demonstrated its…”
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64QAM Modulator With a Hybrid Configuration of Silica PLCs and LiNbO3 Phase Modulators by Yamazaki, Hiroshi, Yamada, Takashi, Goh, Takashi, Sakamaki, Yohei, Kaneko, Akimasa

“…Quadrature amplitude modulation (QAM) is a promising approach for increasing the spectral efficiency of wavelength-division-multiplexing transmission, but its…”
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Simultaneous Dense Differential Phase-Shift Keying Wavelength Division Multiplexing Signal Quality Observation Based on Sequential Ultrafast Field Sampling by Okamoto, T., Ito, F., Sakamaki, Y., Hashimoto, T.

“…This paper describes a signal quality monitoring technique for wavelength division multiplexing (WDM) signals that uses an ultrafast field sampling approach,…”
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All-in-One 112-Gb/s DP-QPSK Optical Receiver Front-End Module Using Hybrid Integration of Silica-Based Planar Lightwave Circuit and Photodiode Arrays by Ohyama, Takaharu, Ogawa, Ikuo, Tanobe, Hiromasa, Kasahara, Ryoichi, Tsunashima, Satoshi, Yoshimatsu, Toshihide, Fukuyama, Hiroyuki, Itoh, Toshihiro, Sakamaki, Yohei, Muramoto, Yoshifumi, Kawakami, Hiroto, Ishikawa, Mitsuteru, Mino, Shinji, Murata, Koichi

“…We propose a new hybrid integrated optical front-end module for a 100-Gb/s-class coherent receiver using silica-based planar lightwave circuit (PLC)…”
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Loss Uniformity Improvement of Arrayed-Waveguide Grating With Mode-Field Converters Designed by Wavefront Matching Method by Sakamaki, Y., Kamei, S., Hashimoto, T., Kitoh, T., Takahashi, H.

“…We describe a silica-based arrayed-waveguide grating (AWG) with low channel-dependent loss variation achieved by using mode-field converters designed with the…”
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Loss Reduction of Waveguide Crossings by Wavefront Matching Method and Their Application to Integrated Optical Circuits by Sakamaki, Y., Saida, T., Hashimoto, T., Kamei, S., Takahashi, H.

“…This paper describes a waveguide crossing design that uses the wavefront matching (WFM) method. The WFM method enables us to design waveguide crossings with…”
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64QAM Modulator With a Hybrid Configuration of Silica PLCs and LiNbO Phase Modulators by Yamazaki, H., Yamada, T., Goh, T., Sakamaki, Y., Kaneko, A.

“…Quadrature amplitude modulation (QAM) is a promising approach for increasing the spectral efficiency of wavelength-division-multiplexing transmission, but its…”
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Silica Waveguide DQPSK Demodulator With Wide Operation Range Enhanced by Using Stress Release Grooves by Sakamaki, Y., Nasu, Y., Hashimoto, T., Hattori, K., Inoue, Y., Takahashi, H.

“…A 43-Gb/s differential quadrature phase-shift keying demodulator is demonstrated with a wide operation range enhanced by birefringence control achieved by…”
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Reduction of Polarization Dependence of PLC Mach-Zehnder Interferometer Over Wide Wavelength Range by Nasu, Y., Hashizume, Y., Sakamaki, Y., Hashimoto, T., Hattori, K., Inoue, Y.

“…Differential phase shift keying are today considered key solutions for the WDM long-haul transmission infrastructure, and a Mach-Zehnder interferometer (MZI)…”
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Low Power Consumption DQPSK Demodulator Using Silica-Based Planar Lightwave Circuit by Sakamaki, Y., Hattori, K., Nasu, Y., Kamei, S., Goh, T., Hashimoto, T., Takahashi, H., Inoue, Y.

“…We demonstrate a low power consumption differential quadrature phase-shift keying (DQPSK) demodulator using silica-based planar lightwave circuit (PLC)…”
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Low Loss and Low Crosstalk Waveguide Crossings Designed by Wavefront Matching Method by Sakamaki, Y., Saida, T., Tamura, M., Hashimoto, T., Takahashi, H.

“…We designed waveguide crossings with small angles by the wavefront matching method to reduce excess loss and crosstalk. The designed waveguide crossings were…”
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Channel-allocation-adaptive WDM signal observation based on sequential ultrafast field sampling by Ito, Fumihiko, Okamoto, Keiji, Tsubokawa, Makoto, Sakamaki, Yohei, Hashimoto, Toshikazu

“…A novel technology for simultaneous WDM signal monitoring is presented based on ultrafast field sampling. Its adaptivity for channel allocation and/or channel…”
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Y-branch waveguides with stabilized splitting ratio designed by wavefront matching method by Sakamaki, Y., Saida, T., Shibata, T., Hida, Y., Hashimoto, T., Tamura, M., Takahashi, H.

“…We designed optical Y-branch waveguides with a stabilized splitting ratio by using a new design approach based on the wavefront matching method. The designed…”
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