Search Results - "Takushima, Y."

High-Speed Multimode Fiber Transmission by Using Mode-Field Matched Center-Launching Technique by Sim, D.H., Takushima, Y., Chung, Y.C.

“…We report that the center-launching technique can be improved to selectively excite the fundamental mode of multimode fiber (MMF). This ldquomode-field…”
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10-Gb/s Operation of RSOA for WDM PON by Cho, K.Y., Takushima, Y., Chung, Y.C.

“…We report on the 1O-Gb/s operation of the reflective semiconductor optical amplifier (RSOA) for the next-generation wavelength-division-multiplexed passive…”
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Transmission of 1.25-Gb/s PSK signal generated by using RSOA in 110-km coherent WDM PON by Jung, S P, Takushima, Y, Chung, Y C

“…We generate the phase-modulated signal by utilizing the chirp characteristics of the directly-modulated reflective semiconductor optical amplifier (RSOA) for…”
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25.78-Gb/s Operation of RSOA for Next-Generation Optical Access Networks by Cho, K Y, Choi, B S, Takushima, Y, Chung, Y C

“…We report the 25.78-Gb/s operation of the reflective semiconductor optical amplifier (RSOA) for the next-generation optical access network. For this purpose,…”
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Optical reflectometry based on correlation detection and its application to the in-service monitoring of WDM passive optical network by Takushima, Y, Chung, Y C

“…We propose and demonstrate a novel technique for measuring the distribution of the reflectivity along an optical fiber transmission line. Unlike the…”
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Long-Reach Coherent WDM PON Employing Self-Polarization-Stabilization Technique by Cho, K Y, Tanaka, K, Sano, T, Jung, S P, Chang, J H, Takushima, Y, Agata, A, Horiuchi, Y, Suzuki, M, Chung, Y C

“…We propose a simple self-polarization-stabilization technique for the wavelength-division-multiplexed passive optical network implemented with reflective…”
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Long-reach 10-Gb/s RSOA-based WDM PON employing QPSK signal and coherent receiver by Cho, K Y, Hong, U H, Jung, S P, Takushima, Y, Agata, A, Sano, T, Horiuchi, Y, Suzuki, M, Chung, Y C

“…We demonstrate a long-reach wavelength-division-multiplexed passive optical network (WDM PON) operating at the symmetric rate of 10.3 Gb/s. For the…”
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Correlation-based OTDR for in-service monitoring of 64-split TDM PON by Shim, H K, Cho, K Y, Takushima, Y, Chung, Y C

“…We demonstrate that the correlation-based optical time domain reflectometer (OTDR) can be used for the in-service monitoring of the 64-split…”
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Phasor monitoring of DxPSK signals using software-based synchronization technique by Choi, H G, Takushima, Y, Chung, Y C

“…We develop a novel phasor monitor to obtain the constellation diagram from asynchronously sampled data measured by using the delay-detection technique. This…”
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Optical performance monitoring technique using asynchronous amplitude and phase histograms by Choi, H Y, Takushima, Y, Chung, Y C

“…We report a new optical performance monitoring technique based on the amplitude and phase histograms of the optical signal. The amplitude and phase histograms…”
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Transmission of 108-Gb/s PDM 16ADPSK signal on 25-GHz grid using non-coherent receivers by Takushima, Y, Choi, H Y, Chung, Y C

“…We demonstrate the transmission of 108-Gb/s polarization-division-multiplexed (PDM) 16-ary amplitude- and differential phase-shift-keying (16ADPSK) signal by…”
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Effects of Reflection in RSOA-Based WDM PON Utilizing Remodulation Technique by Keun Yeong Cho, Yong Jik Lee, Choi, H.Y., Murakami, A., Agata, A., Takushima, Y., Chung, Y.C.

“…We investigate the effects of the discrete reflection on the performances of upstream and downstream signals in the wavelength-division-multiplexed passive…”
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Measurement of Differential Phasor Diagram of Multilevel DPSK Signals by Using an Adjustment-Free Delay Interferometer Composed of a 3 x 3 Optical Coupler by TAKUSHIMA, Y, CHOI, H. Y, CHUNG, Y. C

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Measurement of Differential Phasor Diagram of Multilevel DPSK Signals by Using an Adjustment-Free Delay Interferometer Composed of a 3[Formula Omitted]3 Optical Coupler by Takushima, Y, Choi, HY, Chung, Y C

“…[...] the discrepancy from the ideal 120-degree optical hybrid is not a problem, and hence the requirements of the 3 times 3 couplers are greatly relaxed…”
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Enhanced Operating Range of WDM PON Implemented by Using Uncooled RSOAs by Cho, K.Y., Takushima, Y., Chung, Y.C.

“…We report on the operable ranges of temperature and wavelength for a 1.25-Gb/s wavelength-division-multiplexed passive optical network (WDM PON) implemented by…”
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All-optical 80-Gb/s add-drop multiplexer using fiber-based nonlinear optical loop mirror by Ju Han Lee, Tanemura, T., Takushima, Y., Kikuchi, K.

“…We propose and demonstrate a novel scheme of the all-optical, high-speed add-drop multiplexer (ADM) for the optical time-division multiplexed signal. The ADM…”
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OSNR Monitoring Technique for DPSK/DQPSK Signals Based on Self-Heterodyne Detection by Choi, H.Y., Takushima, Y., Chung, Y.C.

“…We describe a new method for monitoring the ldquoin-bandrdquo optical signal-to-noise ratio (OSNR) of differential phase-shift-keying (DPSK) and differential…”
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Complete characterization of picosecond optical pulses in long-haul dispersion-managed transmission systems by Ozeki, Y., Takushima, Y., Yoshimi, H., Kikuchi, K., Yamauchi, H., Taga, H.

“…We demonstrate the intensity and phase characterization of picosecond pulses in long-haul transmission systems by using the direct spectral phase detection…”
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Hybrid WDM/TDMA-PON Using Self-Homodyne and Differential Coding by Soo-Jin Park, Young-Bok Choi, Seung Pil Jung, Keun Young Cho, Takushima, Y., Yun Chur Chung

“…A hybrid wavelength-division-multiplexing/ time-division multiple access-passive optical network system using self-homodyne scheme and differential coding was…”
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Quality Monitoring of DxPSK Signals by Using Differential Phasor Diagram by Takushima, Y., Hyeon Yeong Choi, Hoon Kim, Chung, Y.C.

“…We describe a new method for quantitative evaluation of the quality of multilevel differential phase-shift-keyed (DxPSK) signals by using a differential phasor…”
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