Mr. Tokuhashi’s letter regarding with  Active Optical Access Network was published in Journal of IEICE（Aug. 2010）

title:Dynamic Packet (Frame) Based Ranging Method for Active Optical Access Network
authors:Kazumasa TOKUHASHI, Kunitaka ASHIZAWA, Daisuke ISHII, Yutaka ARAKAWA, Satoru OKAMOTO, and Naoaki YAMANAKA
abstract:In an active optical access network with high-speed optical switches, a precise ranging method adopting dynamic packet (frame) is proposed. In the experiment using our developed prototypes of OLT, ONUs and a switch emulator, a dynamic packet based ranging method between OLT and ONUs was successfully executed.”,”