A 40G SDH fiber-optical transmission system, a project contracted to the Wuhan Institute of Posts and Telecommunications under the National Key Technology Program for the 10th Five-year period(2001-2005), passed a validation check on January 5, 2006. Through attacking technical difficulties involving high-speed and large-volume optical telecommunications, researchers have worked out the world?痵 first 40Gb/s STM-256 SDH equipment up to the ITU-T standard. Having passed grid experiments and long term stability tests, the system is able to deliver a non-reproductive 560-km long distance transmission over G. 652 and G.655 optic-fiber cables.
As the world?痵 first 40G fiber-optical transmission system up to the ITU standards, the new equipment heralds the largest and fastest single-channel optical transmission system in the world, with a capacity four times that of the most advanced transmission system in the world. The system proves a breakthrough in exceeding the limit of electronic signal processing, which makes a half million people simultaneously talking over a hair-thin optical line possible. Combined with Wavelength Division Multiplexing techniques, a single optic-fiber may allow millions or even hundred millions of people to talk simultaneously, with only half of the costs asked by the existing equipment.
The new system has been granted with 29 patents, of which 18 are invention grants. |
