capacity WDM system, optical transmission network technology, a new generation of optical fiber, IPoverOptical and optical access network technology.

( 1) to the high speed system development

The current 10Gbps system has been applied to a large number of network. The 10Gbps system for optical fiber polarization mode dispersion is more sensitive, and has laid the cable and can meet up and use 10Gbps system, before opening to the actual test, unvalidated before installation of the opening. It is the development direction of the steering light multiplexing mode. An optical way has many kinds, but at present only the wavelength division multiplexing ( WDM ) is a large-scale commercial, while the other way is still in the stage of experimental study.

( 2) to the large capacity WDM system evolution

Electricity time division multiplexing system capacity limitation is very big, and the optical fiber 200nm available bandwidth resources only with utilization rate of less than 1%, there are 99% resource has not been utilized. If multiple wavelength light signal at the same time in a single core fiber transmission, can