Fujitsu has just announced an interesting technology: they were able to bind to 40 Gbit / s using a directly modulated laser and without cooling. It's interesting in the sense that conventional systems that achieve this speed generally require external optical modulation system, which must be cooled and therefore increases the cost.
Usually, direct modulation can not exceed 10 gigabits per second Fujitsu's technology achieves 40 Gbit / s optical fiber with a range of 5 km without repeater and especially without active cooling, the system operates between 25 ° C and 70 ° C. The cost is lower than conventional technologies and Fujitsu is working with a wavelength of about 1.3 micrometers.
The direct applications of the technology are not yet available, but it should ultimately reduce costs on high-speed transmissions, a key to the improvement of networks in the future. 
Usually, direct modulation can not exceed 10 gigabits per second Fujitsu's technology achieves 40 Gbit / s optical fiber with a range of 5 km without repeater and especially without active cooling, the system operates between 25 ° C and 70 ° C. The cost is lower than conventional technologies and Fujitsu is working with a wavelength of about 1.3 micrometers.
The direct applications of the technology are not yet available, but it should ultimately reduce costs on high-speed transmissions, a key to the improvement of networks in the future.
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