OREANDA-NEWS. March 10, 2011. Fujitsu Limited and Fujitsu Laboratories Ltd. today announced the achievement of a 40 gigabits per second (40-Gbps) optical-fiber transmission employing an uncooled directly-modulated laser(1). This was realized through the combination of a structure specifically adapted to high-speed operation, and a newly-developed structure capable of lowering operating current and enabling high-temperature operation. Featuring power consumption at less than half that of commercialized 40-Gbps optical transmitters, Fujitsu's new directly-modulated laser obviates the need for a thermoelectric controller. This achievement represents a major step toward lowering the power consumption of the next generation of high-speed optical communications.

Details of this technology were presented at the Optical Fiber Communication Conference and Exposition/National Fiber Optic Engineers Conference 2011 (OFC/NFOEC 2011) being held in Los Angeles from March 6-10. Part of this work was carried out under the "Next-generation High-efficiency Network Device Project" which the Photonics Electronics Technology Research Association (PETRA) contracted with New Energy and Industrial Technology Development Organization (NEDO) of Japan.