increase in business volume and interconnecting any system and different system signal.

Optical networking has become the SDH and power network after another new development climax of optical communication. The construction of a maximum transparent, highly flexible and large capacity of the national backbone optical network, not only for the future of the national information infrastructure ( NJJ ) to lay a solid foundation, but also to our country first Century the information industry and national economy

development and national security have the extremely important strategic sense.

( 4) the development of a new generation of optical fiber

The traditional G.652 single-mode fiber in adapting to the high speed long distance transmission network development needs has exposed many shortcomings, research and development of new fiber has become the next generation of network

infrastructure is an important component of. At present, in order to adapt to the backbone and man 's different development needs, has appeared two kinds of novel optical fiber, namely non-zero dispersion ( G.655 fiber ) and percutaneous absorption peak fiber ( all wave fiber ). Among them, all wave fiber will be the