Koji Wakayama

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We are proposing a new optical access network architecture using PLZT 10 nsec high-speed optical switches, called Active Optical Network (ActiON). Our architecture can increase four times the number of subscribers as well as double the distance between OLT and ONUs than GE-PON. Moreover, a user can establish secure communication in ActiON. Because ActiON(More)
The wavelength (λ)-tunable wavelength-division multiplexing/time-division multiplexing passive optical network (WDM/TDM-PON) can distribute traffic loads fairly by dynamically reallocating a certain number of optical network units (ONUs) from highly loaded optical subscriber units (OSUs) to lightly loaded OSUs. This reallocation can be executed by(More)
An active optical access network architecture with our newly developed PLZT ((Pb, La) (Zr, Ti)O3) high-speed optical switch is introduced, with a view to realizing the nextgeneration high capacity scalable access network. This system is developed based on the latest IEEE standard of PON (10G-EPON; IEEE802.3av) in consideration of the coordination with(More)
Adequate blood flow (Qb) is necessary for effective hemodialysis (HD). Aim of the study was to examine relationship between the actually delivered Qb (dQb) and reported Qb (rQb) with dialysis machine. One hundred HD patients with arteriovenous fistula were enrolled. Delivered Qb was measured at the beginning and end of each HD session. dQb/rQb < 1 indicated(More)
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