Japanese companies demo 40Gbps passive FTTP tech

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Japanese companies demo 40Gbps passive FTTP tech
NTT Burst mode optical amplifier.

Claim forty-fold capacity increase.

Two Japanese companies have combined three key fibre optics technologies to develop a solution that provides 40 gigabit per second fibre to the premises connectivity, in order to meet ever-increasing customer traffic capacity demands.

The current generation of passive optical networks provide 2.488Gbps downloads and 1.244Gbps upload speeds - 10/2.5Gbps 10-GPON deployments are rare.

Japan's Nippon Telegraph and Telephone Corporation (NTT) and Oki Electric Industry announced a successful demonstration of a passive optical access system that provided 40Gbps over 40 kilometres, serving 1024 users - 40 times the transmission capacity of existing systems, and 32 times more users than today's passive optical networks (PONs).

The two companies achieved the longer distance and higher capacity by combining PON with wavelength and time division multiplexing - WDM and TDM respectively - in field tests in Hokkaido, northern Japan.

Source: NTT

While the maximum bandwidth of each wavelength in the PON is 10Gbps, the NTT and OKI WDM/TDM technology combines four beams of light for a total of 40Gbps symmetric transmission capacity.

Challenges encountered while developing the high-speed fibre included avoiding frame losses for data transmission, and building cost-effective semiconductior optical amplifiers for the WDM/TDM-PON to achieve the 40 km transmission distance for the 1-to-1024 split ratio. 

OKI and NTT said they will present the project and its findings at the International Telecommunications G.989 or Next Generation PON2 standardisation committee and work on miniaturising the equipment for the system.

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