OKI Electric Industry has developed a 160Gbps ultra high-speed optical next generation access (NGA) asymmetric PON system using hybrid Optical Time Division Multiplexing (OTDM) and Optical Code Division Multiplexing (OCDM).
Existing passive optical access systems are operated at 1.25Gbps in Japan and 2.5 Gbps in the US, Europe and elsewhere. OKI noted that in such optical access systems, the communication capacity per user when 16 users are connected, is limited to 78 to 156Mbps.
The ultra high-speed NGA Asymmetric PON system developed by OKI achieves 128-times larger capacity than that of GE-PON systems and 64-times larger capacity than GPON systems. This means that with 16 users, telecom carriers can offer a 10 Gbps capacity for each user.
The Optical Line Terminal (OLT) used in the system processes 10Gbps signals using a 16-chip encoder and then optically multiplexes them into a 25ps TDM slot. OKI quadrupled the signal with wavelength to output a multiplex signal of 10Gbps x 16 ch. OKI then transmits this 160 Gbps signal over a 20km distance (the longest in an optical access system). The signal is then divided with a 1 x 16 splitter. An ONU then extracts and decodes the 10Gbps signal.
The research that led to OKI’s achievement was conducted as part of the “Research and development for ultra high-speed optical NGA Asymmetric PON system,” under the auspices of NICT’s “Basic Technology Promotion System for Private Sectors Program.
http://www.oki.com/en/press/2009/03/z08149e.html
