Fujitsu applies Discrete Multi-Tone for 100G optical transmission with 10G components

March 15, 2013
Fujitsu Laboratories Ltd. and Fujitsu Research and Development Center Co., Ltd. of China will present at OFC/NFOEC next week results from their work with applying Discrete Multi-Tone (DMT) – a common modulation/demodulation format in DSL networks – to optical transmission. The labs say use of DMT enables 100-Gbps transmission via optical components designed for 10-Gbps fiber-optic networks. The work provides a direction toward low-cost 400 Gigabit Ethernet devices, they say.

Fujitsu Laboratories Ltd. and Fujitsu Research and Development Center Co., Ltd. of China will present at OFC/NFOEC next week results from their work with applying Discrete Multi-Tone (DMT) – a common modulation/demodulation format in DSL networks – to optical transmission. The labs say use of DMT enables 100-Gbps transmission via optical components designed for 10-Gbps fiber-optic networks. The work provides a direction toward low-cost 400 Gigabit Ethernet devices, they say.

The technology will be demonstrated at the Fujitsu Optical Components Ltd. booth on the show floor.

DMT divides the data to be transmitted into multiple subcarriers (carrier waves). Multi-level modulation is used for each subcarrier to achieve high transmission speeds. To optimize each subcarrier's power and number of multiple values, Fujitsu engineers developed an algorithm that checks receiving conditions between optical transceivers at the time the system is started up and optimizes power and the number of multiple values to suit the transceivers and line conditions.

The approach enables module designers to use conventional 10-Gbps components to transmit 100-Gbps signals, the laboratories assert. If some components can’t maintain sufficient linearity, these components can be profiled in advance and compensated for, the labs explain.

Applying the technology to four channels would enable creation of a 400-Gbps Ethernet transceiver, the Fujitsu researchers add. An integrated DMT modem is “under consideration,” according to the Fujitsu team. Meanwhile, additional improvements for using existing technologies are underway.

For more information on optical transceivers and suppliers, visit the Lightwave Buyer’s Guide.

Sponsored Recommendations

The Perils of Using a Broadband Power Meter in a PON World

Nov. 7, 2023
Learn about the potential significant problems for multi-service PON activation and troubleshooting when using a broadband power meter.

Coherent Routing and Optical Transport – Getting Under the Covers

April 11, 2024
Join us as we delve into the symbiotic relationship between IPoDWDM and cutting-edge optical transport innovations, revolutionizing the landscape of data transmission.

On Topic: WiFi Support Strategies

July 9, 2022
Customers increasingly rely on WiFi to access services on all their screens. That means performance expectations are growing. This Broadband Technology Report On Topic addresses...

Supporting 5G with Fiber

April 12, 2023
Network operators continue their 5G coverage expansion – which means they also continue to roll out fiber to support such initiatives. The articles in this Lightwave On Topic ...