Infocommunications and Social Infrastructure Systems Randnter

United Kingdom

Infocommunications and Social Infrastructure Systems Randnter

United Kingdom
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Umeda D.,Infocommunications and Social Infrastructure Systems Randnter | Tanaka N.,Infocommunications and Social Infrastructure Systems Randnter | Yoshimura A.,Infocommunications and Social Infrastructure Systems Randnter | Kizaki N.,Infocommunications and Social Infrastructure Systems Randnter | And 2 more authors.
SEI Technical Review | Year: 2017

We provide advanced broadband technologies and passive optical network (PON) equipment to the market. Recently, we have developed a repeater for 10 Gigabit-Ethernet PON (10G-EPON) systems. Installed between an optical line terminal (OLT) and optical network units (ONUs), the repeater significantly expands the data transmission distance from the conventional 20 km to 60 km. Wavelength division multiplexing (WDM) technology enables its connection to the OLT using an optical fiber and 8 channel support. This paper describes the performance of the repeater and the key technology in relaying upstream burst signals.


Hirai H.,Infocommunications and Social Infrastructure Systems Randnter | Shiba S.,Infocommunications and Social Infrastructure Systems Randnter | Kouyama S.,Infocommunications and Social Infrastructure Systems Randnter | Shimada Y.,Infocommunications and Social Infrastructure Systems Randnter | And 2 more authors.
SEI Technical Review | Year: 2013

FTTH (Fiber To The Home) is the mainstream broadband service in Japan, and the number of its subscribers has been increasing. Many of those subscribers are using telephone service, terrestrial digital television service, and video-ondemand service provided by IP networks. Therefore, FTTH systems are increasingly required to have high stability and the same redundancy that a telephone switchboard has. To meet this demand, we have developed the next-generation FTTH technology 10G-EPON (10 Gigabit Ethernet Passive Optical Network) system that provides the protection function to achieve redundancy at the time of maintenance or emergency. It also includes the in-service firmware update function. This paper presents the evaluation results of this system and introduces our approaches to the improvement in maintenance and operation of 10G-EPON system.

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