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Fujitsu Laboratories said it has managed to transmit 40 Gbps over optical fiber at half the power consumption of present commercialized 40Gbps optical transmitters.
Using a combination of a structure specifically adapted for high speed operation, the lab team managed to transmit at a lower operating current using a Fujitsu-designed uncooled directly-modulated laser.
The operation temperature range sits at about 25 to 70 degrees celcius when tested over a distance of 25km.
"This technology obviates the need for thermoelectric controllers that are currently used in 40 Gbps optical transmitters, and cuts power consumption by more than half. In addition, the reduced part count can lead to lower costs," Fujitsu said.
The work is being undertaken as part of Fujitsu’s plans to develop high-density networking solutions for cloud computing services and video distribution services. "There is a growing need for optical communications that consume less electrical power," Fujitsu said.
Fujitsu has designed its directly modulated lasers to operate at speeds of more than 10Gbps in the 1.3 µm wavelength band, which it says allows it to operate at a low driving current.
"The active layer that produces the laser light consists of a multiple quantum-well structure made of aluminium-gallium-indium-arsenide (AlGaInAs) - which is especially well-suited to high-speed operation - and for the optical waveguide, a semi-insulating buried heterostructure is adopted featuring a low parasitic capacitance that is ideally suited for use at high speeds," Fujitsu said.
To see more about how HP's modulated laser works, click the image below.
