The investigation of types of optic fiber in information transfer with developed network

Today, wherever there are modern telecommunication system, cable TV (television) systems, computer networks and Internet, there will be heard something about optic fiber too. Also, customers need services like recording voice and video, and different devices are used such as notebooks, cellular phones, video camera, etc. Therefore, a wide range of mobile and fixed devices well emerge. From the customer's viewpoint, the network heterogeneity is incomprehensible. In past, there were different networks to respond to these various need by service providers which were optimized for a special need. For example PSTN was designed for voice services, IP network for Internet services (web) and data network based on switching for services like ATM and frame relay, and also special network for a special application such as video conference. This report presents on estimate of IP Generation networks, NGN advantages, and also important role of optic fiber transfer technology which is developed recently. DWDM technology makes the access to NGN possible. NGN services based on develop switching will be integrated with a control level. Three architectures of different networks will be introduced in this part including shared IP only network, compound network, fiber network, and dark fibers, which will be described.