OADM equipment in long haul and metro networks are useless.
◆ In the trunk applications, OADM device of choice up and down business intermediate nodes.
◆ MAN OADM applications is the main battlefield, can play its flexible networking, easy network upgrade and expansion of the scale, it is the ideal MAN multi-service transport platform.

OADM optical network allows different signals of different wavelengths at different locations drop multiplexing, optical cross-connect (OXC) device allows different networks can be dynamically combined DAMA wavelength resources to achieve a wider range of network interconnection. OADM and optical cross connect (OXC) device node will only need to download information into the processing equipment (including ATM switches, SDH switches and IP routers), without the need for this node processing information directly from an optical channel from this node, thereby greatly improve the efficiency of information processing nodes, overcomes the disadvantages of electric processing nodes must be treated for all incoming IP packets.

Optical Code Division Multiple Access (OCDMA) technology is a good all-optical network construction technique, it avoids queuing "electronic bottleneck" effect, and network protocol communications equipment delay, to achieve high-speed information transfer and fast asynchronous information access.

All-optical backbone network consisting of OCDMA technology, both up and down the road information may be in the node, it can also be carried out in any location through fiber-optic lines, and will not affect the normal transmission of other users on the fiber-optic lines, which overcomes the traditional network up and down the road can only limit the information carried in the node. Light up and down the road may be needed in the two optical cross-connect nodes or optical switching at any time between the nodes.