The Experts below are selected from a list of 1416 Experts worldwide ranked by ideXlab platform
Shu Yamamoto - One of the best experts on this subject based on the ideXlab platform.
-
Long-haul soliton WDM transmission with periodic dispersion Compensation and dispersion Slope Compensation
Journal of Lightwave Technology, 1999Co-Authors: Itsuro Morita, Noboru Edagawa, Masatoshi Suzuki, Keiji Tanaka, Shu YamamotoAbstract:A 20 Gb/s-based soliton wavelength division multiplexed (WDM) transmission experiments using periodic dispersion Compensation and dispersion Slope Compensation were demonstrated. Accumulated dispersion Slope was compensated with two methods, The first method was periodical individual dispersion Compensation. By using this technique, 60 Gb/s (20 Gb/s x 3 WDM) transmission over 8000 km was demonstrated. The second method was the use of a dispersion-flattened transmission fiber. 160 Gb/s (20 Gb/s x 8 WDM) transmission over 4000 km using periodically dispersion compensated dispersion-flattened fiber was also demonstrated.
-
Long-haul soliton WDM transmission with periodic dispersion Compensation and dispersion Slope Compensation
Journal of Lightwave Technology, 1999Co-Authors: Itsuro Morita, Noboru Edagawa, Masatoshi Suzuki, Keiji Tanaka, Shu YamamotoAbstract:A 20 Gb/s-based soliton wavelength division multiplexed (WDM) transmission experiments using periodic dispersion Compensation and dispersion Slope Compensation were demonstrated. Accumulated dispersion Slope was compensated with two methods. The first method was periodical individual dispersion Compensation. By using this technique, 60 Gb/s (20 Gb/s/spl times/3 WDM) transmission over 8000 km was demonstrated. The second method was the use of a dispersion-flattened transmission fiber. 160 Gb/s (20 Gb/s/spl times/8 WDM) transmission over 4000 km using periodically dispersion compensated dispersion-flattened fiber was also demonstrated.
-
20 WDM, 10.66 Gbit/s transmission experiment over 9000 km using periodic dispersion Slope Compensation
Electronics Letters, 1998Co-Authors: H. Taga, Noboru Edagawa, Masatoshi Suzuki, Shu Yamamoto, N. Takeda, K. Imai, S. AkibaAbstract:A 213 Gbit/s, 9064 km transmission experiment was successfully demonstrated using periodic dispersion Slope Compensation. The dispersion Slope compensator was realised using a pair of arrayed waveguide gratings and dispersion Compensation fibres. This is the largest capacity WDM transmission experiment over 9000 km reported to date.
Y. Sugimoto - One of the best experts on this subject based on the ideXlab platform.
-
ASP-DAC - A current-mode DC-DC converter using a quadratic Slope Compensation scheme
2009 Asia and South Pacific Design Automation Conference, 2009Co-Authors: Chihiro Kawabata, Y. SugimotoAbstract:A quadratic Slope Compensation scheme for a current-mode DC-DC converter to obtain stable frequency characteristics without depending on the input and output voltages is proposed. A 5 MHz and 500 mA buck DC-DC converter with input voltages ranging from 3.3 V to 2.5 V and with output voltages ranging from 2.5 V to 0.5 V was fabricated by using a 0.35 μm CMOS process to verify the effectiveness of the scheme. Little variation of frequency characteristics at frequencies above 200 KHz for the various input and output voltages was observed.
-
A current-mode DC-DC converter using a quadratic Slope Compensation scheme
2009 Asia and South Pacific Design Automation Conference, 2009Co-Authors: Chihiro Kawabata, Y. SugimotoAbstract:A quadratic Slope Compensation scheme for a current-mode DC-DC converter to obtain stable frequency characteristics without depending on the input and output voltages is proposed. A 5 MHz and 500 mA buck DC-DC converter with input voltages ranging from 3.3 V to 2.5 V and with output voltages ranging from 2.5 V to 0.5 V was fabricated by using a 0.35 mum CMOS process to verify the effectiveness of the scheme. Little variation of frequency characteristics at frequencies above 200 KHz for the various input and output voltages was observed.
-
a cmos current mode dc dc converter with input and output voltage independent stability and frequency characteristics utilizing a quadratic Slope Compensation scheme
European Solid-State Circuits Conference, 2007Co-Authors: K Umimura, H. Sakurai, Y. SugimotoAbstract:A CMOS Current-mode DC-DC converter using a quadratic Slope Compensation scheme is presented. The use of a quadratic Slope instead of a conventional linear Slope makes a damping factor and a frequency bandwidth of a current feedback loop independent of the converter's output voltage. Further designing the coefficient of the quadratic Slope to be fully dependent of the input voltage, the damping factor and the frequency bandwidth become completely independent of both the input and output voltages. A test chip of a buck converter in a 5 MHz operation which uses a quadratic Slope Compensation scheme has been fabricated by using a 0.35 mum CMOS process. The evaluation results show that with a current capability of up to 500 mA the frequency characteristics of the total loop are constant when the input and output voltages change from 3.3 V to 2.5 V and from 2.5 V down to 0.5 V, respectively, and also that the recovery time is 50 mus with a peak voltage deviation of less than 50 mV for load current changes from 20 mA to 200 mA and vice versa.
-
analysis and design of a current mode pwm buck converter adopting the output voltage independent second order Slope Compensation scheme
IEICE Transactions on Fundamentals of Electronics Communications and Computer Sciences, 2005Co-Authors: H. Sakurai, Y. SugimotoAbstract:In this paper, we propose the use of second-order Slope Compensation for a current-mode PWM buck converter. First, the current feedback loop in a current-mode PWM buck converter using a conventional Slope Compensation is analyzed by the small-signal transfer function. It becomes clear that the stability and frequency bandwidth of the current feedback loop is affected by the external input voltage and the output voltage of the converter. Next, the loop with second-order Slope Compensation is analyzed, and the result shows that the loop becomes unconditionally stable with the adoption of second-order Slope Compensation with appropriate parameter values and a current sensing circuit whose current is sensed across an impedance that is inversely proportional to the input voltage. In order to verify our theory, we designed whole circuits of a current-mode PWM buck converter including the new inductor current sensing circuit and the second-order voltage generator circuit using device parameters from the 0.6 μm CMOS process. The circuit simulation results under the conditions of 4 MHz switching frequency, 3.6 V input voltage and 2.4 V output voltage are presented.
-
Design of a current-mode, MOS, DC-DC buck converter with a quadratic Slope Compensation scheme
48th Midwest Symposium on Circuits and Systems 2005., 2005Co-Authors: H. Sakurai, Y. SugimotoAbstract:We propose the use of quadratic Slope Compensation in a current-mode DC-DC buck converter in place of the conventional linear Slope Compensation scheme. When the inductor-current detection circuit is constructed such that it has a transfer function that is inversely proportional to the input voltage, the Slope value of the current feedback loop becomes insensitive to the converter's output voltage and the damping factor of the loop becomes constant. Therefore, stable operation with large frequency bandwidth is realized. Applying the quadratic Slope Compensation, a CMOS DC-DC buck converter was designed that had an output voltage range from 4.5V to 0.7V, an output current range up to 1A, and a switching frequency of 5MHz using a 0.6/spl mu/m CMOS process.
Itsuro Morita - One of the best experts on this subject based on the ideXlab platform.
-
Long-haul soliton WDM transmission with periodic dispersion Compensation and dispersion Slope Compensation
Journal of Lightwave Technology, 1999Co-Authors: Itsuro Morita, Noboru Edagawa, Masatoshi Suzuki, Keiji Tanaka, Shu YamamotoAbstract:A 20 Gb/s-based soliton wavelength division multiplexed (WDM) transmission experiments using periodic dispersion Compensation and dispersion Slope Compensation were demonstrated. Accumulated dispersion Slope was compensated with two methods, The first method was periodical individual dispersion Compensation. By using this technique, 60 Gb/s (20 Gb/s x 3 WDM) transmission over 8000 km was demonstrated. The second method was the use of a dispersion-flattened transmission fiber. 160 Gb/s (20 Gb/s x 8 WDM) transmission over 4000 km using periodically dispersion compensated dispersion-flattened fiber was also demonstrated.
-
Long-haul soliton WDM transmission with periodic dispersion Compensation and dispersion Slope Compensation
Journal of Lightwave Technology, 1999Co-Authors: Itsuro Morita, Noboru Edagawa, Masatoshi Suzuki, Keiji Tanaka, Shu YamamotoAbstract:A 20 Gb/s-based soliton wavelength division multiplexed (WDM) transmission experiments using periodic dispersion Compensation and dispersion Slope Compensation were demonstrated. Accumulated dispersion Slope was compensated with two methods. The first method was periodical individual dispersion Compensation. By using this technique, 60 Gb/s (20 Gb/s/spl times/3 WDM) transmission over 8000 km was demonstrated. The second method was the use of a dispersion-flattened transmission fiber. 160 Gb/s (20 Gb/s/spl times/8 WDM) transmission over 4000 km using periodically dispersion compensated dispersion-flattened fiber was also demonstrated.
N.s. Bergano - One of the best experts on this subject based on the ideXlab platform.
-
Transmission of 40-Gb/s WDM signals over transoceanic distance using conventional NZ-DSF with receiver dispersion Slope Compensation
Journal of Lightwave Technology, 2006Co-Authors: C.r. Davidson, W.t. Anderson, A.n. Pilipetskii, M. Nissov, Haifeng Li, D.g. Foursa, W.w. Patterson, P.c. Corbett, A.j. Lucero, N.s. BerganoAbstract:This paper investigated the impact of receiver dispersion Slope Compensation for 40-Gb/s transoceanic transmission over conventional nonzero dispersion shifted fibers. Various differential phase-shift keying (DPSK) modulation formats were experimentally compared at 42.8 Gb/s [to account for forwarded error correction (FEC) overhead] with dispersion Slope compensators at the receiver. These transmission measurements were performed in a circulating loop over a transatlantic distance of 6250 km using a variety of channel spacings, relative polarizations, and synchronous modulation techniques. All formats benefited from receiver dispersion Slope Compensation. For orthogonally polarized channels on 133-GHz spacing, the return-to-zero DPSK (RZ-DPSK) format performed the best; all channels (18 /spl times/ 40 Gb/s) propagated with > 13.5-dB Q-factor and with > 4-dB FEC margin. Whereas for copolarized channels on 100-GHz spacing, carrier-suppressed return-to-zero (CSRZ)-DPSK performed the best; all channels (25 /spl times/ 40 Gb/s) propagated with > 3-dB FEC margin. Moreover, it was shown that parallel launch only suffered a penalty of /spl sim/ 0.2 and /spl sim/ 0.5 dB relative to the orthogonal launch for 133and 100-GHz channel spacing, respectively. Finally, it was demonstrated that copolarized 40 Gb/s RZ-DPSK worked as well as 10 Gb/s RZ-ON-OFF keying (RZ-OOK) for the same spectral efficiency (30%) over the 6250 km of conventional nonzero dispersion shifted fibers (NZ-DSF) originally designed for 10 Gb/s transmission.
-
transmission of 40 gb s wdm signals over transoceanic distance using conventional nz dsf with receiver dispersion Slope Compensation
Optical Fiber Communication Conference, 2006Co-Authors: C.r. Davidson, W.t. Anderson, A.n. Pilipetskii, M. Nissov, Haifeng Li, D.g. Foursa, W.w. Patterson, P.c. Corbett, A.j. Lucero, N.s. BerganoAbstract:This paper investigated the impact of receiver dispersion Slope Compensation for 40-Gb/s transoceanic transmission over conventional nonzero dispersion shifted fibers. Various differential phase-shift keying (DPSK) modulation formats were experimentally compared at 42.8 Gb/s [to account for forwarded error correction (FEC) overhead] with dispersion Slope compensators at the receiver. These transmission measurements were performed in a circulating loop over a transatlantic distance of 6250 km using a variety of channel spacings, relative polarizations, and synchronous modulation techniques. All formats benefited from receiver dispersion Slope Compensation. For orthogonally polarized channels on 133-GHz spacing, the return-to-zero DPSK (RZ-DPSK) format performed the best; all channels (18 × 40 Gb/s) propagated with > 13.5-dB Q-factor and with > 4-dB FEC margin. Whereas for copolarized channels on 100-GHz spacing, carrier-suppressed return-to-zero (CSRZ)-DPSK performed the best; all channels (25 × 40 Gb/s) propagated with >3-dB FEC margin. Moreover, it was shown that parallel launch only suffered a penalty of ∼ 0.2 and ∼ 0.5 dB relative to the orthogonal launch for 133- and 100-GHz channel spacing, respectively. Finally, it was demonstrated that copolarized 40 Gb/s RZ-DPSK worked as well as 10 Gb/s RZ-ON-OFF keying (RZ-OOK) for the same spectral efficiency (30%) over the 6250 km of conventional nonzero dispersion shifted fibers (NZ-DSF) originally designed for 10 Gb/s transmission.
Masatoshi Suzuki - One of the best experts on this subject based on the ideXlab platform.
-
Long-haul soliton WDM transmission with periodic dispersion Compensation and dispersion Slope Compensation
Journal of Lightwave Technology, 1999Co-Authors: Itsuro Morita, Noboru Edagawa, Masatoshi Suzuki, Keiji Tanaka, Shu YamamotoAbstract:A 20 Gb/s-based soliton wavelength division multiplexed (WDM) transmission experiments using periodic dispersion Compensation and dispersion Slope Compensation were demonstrated. Accumulated dispersion Slope was compensated with two methods, The first method was periodical individual dispersion Compensation. By using this technique, 60 Gb/s (20 Gb/s x 3 WDM) transmission over 8000 km was demonstrated. The second method was the use of a dispersion-flattened transmission fiber. 160 Gb/s (20 Gb/s x 8 WDM) transmission over 4000 km using periodically dispersion compensated dispersion-flattened fiber was also demonstrated.
-
Long-haul soliton WDM transmission with periodic dispersion Compensation and dispersion Slope Compensation
Journal of Lightwave Technology, 1999Co-Authors: Itsuro Morita, Noboru Edagawa, Masatoshi Suzuki, Keiji Tanaka, Shu YamamotoAbstract:A 20 Gb/s-based soliton wavelength division multiplexed (WDM) transmission experiments using periodic dispersion Compensation and dispersion Slope Compensation were demonstrated. Accumulated dispersion Slope was compensated with two methods. The first method was periodical individual dispersion Compensation. By using this technique, 60 Gb/s (20 Gb/s/spl times/3 WDM) transmission over 8000 km was demonstrated. The second method was the use of a dispersion-flattened transmission fiber. 160 Gb/s (20 Gb/s/spl times/8 WDM) transmission over 4000 km using periodically dispersion compensated dispersion-flattened fiber was also demonstrated.
-
20 WDM, 10.66 Gbit/s transmission experiment over 9000 km using periodic dispersion Slope Compensation
Electronics Letters, 1998Co-Authors: H. Taga, Noboru Edagawa, Masatoshi Suzuki, Shu Yamamoto, N. Takeda, K. Imai, S. AkibaAbstract:A 213 Gbit/s, 9064 km transmission experiment was successfully demonstrated using periodic dispersion Slope Compensation. The dispersion Slope compensator was realised using a pair of arrayed waveguide gratings and dispersion Compensation fibres. This is the largest capacity WDM transmission experiment over 9000 km reported to date.
