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His research interests include optical Internet and network simulations. Ashwin Gumaste , Tony Antony. Window of Operations. Networking with DWDM1. Direct and External. Couplers and Circulators. Analysis of the Node. Virtual Topology Design. Networking with DWDM2. Raman Amplifier. Pre and Postcompensation.

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Margin Requirements. Metro Access Networks. LongHaul Networks. LongHaul System Design. Transparent Optical Networks. The use of new technologies provides new subjects on network design and planning; Paper [3] has explained to overcome the bandwidth issue by using the wdm system.

Since Dwdm channel spacing is less than the CWDM Channel spacing Paper [4] explains Capacity expansion of the fiber optic network since the internet, cctv, television users are more now a days. High bandwidh is required.

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Capacity of the fiber has to be expanded. Paper [5] says about general characteristics of multihop systems are discussed, and various multihop approaches are reviewed. The construction of optimal structures based on minimizing the maximum link flow and optimizations based on minimization of the mean network packet delay are also reviewed Paper [6] includes Basics Of optical networking. How this service will be provided; Description of optical amplifier system. Amplifier and multiplexing technologies are required to expand the capacity.

Paper [8] describes an architecture and analyses the performance of dynamic provisioning of light paths in an optical network. Paper [9] Network traffic demands are forecast to increase for the foreseeable future, with the challenge being to meet the demand while maintaining or lowering network costs. Simply increasing capacity will not be sufficient; overall bandwidth utilization also needs to improve.

A combination of improved transport capacity through increased spectral efficiency and bit rate along with better network utilization by integrating sub channel electrical grooming into the transmission system will be required. Smarter ways to utilize optical capacity are key since transmission costs have been decreasing slower than grooming and switching costs. Paper [10] Optical fiber communication from transmission to networking has been explained.. Over the last decade, fiber optic cables have been installed by carriers as the backbone of their interoffice networks, becom ing the mainstay of the telecommunications infrastructure.

Optical fiber is used by many telecommunications companies to transmit telephone signals, Internet communication, and cable television signals. Communication, which in the past was confined to narrowband voice signals, now demands a high quality visual, audio and data context.

WDM Systems and Networks: Modeling, Simulation, Design and Engineering

Every aspect of human interplay-from business, to entertainment, to government increasingly depends on rapid and reliable communication networks. Indeed, the advent of the Internet alone is introducing millions of individuals to a new world of information and technology. The telecommunications industry, however, is struggling to keep pace with these changes.

An enormous amount of bandwidth capacity is required to provide the services demanded by consumers. To reach the customer demand more capacity is needed, so carriers have three possible solutions: Install new fiber or Invest in new TDM technology to achieve faster bit rates. DWDM is the best choice which increases the capacity of the embedded fiber by combining and transmitting multiple signals simultaneously at different wavelengths on the same fiber.

In effect, one fiber is transformed into multiple virtual fibers. So, to multiplex eight OC signals into one fiber, you would increase the carrying capacity of that fiber from 2. A key advantage to DWDM is that it's protocol- and bit-rate-independent. Therefore, DWDMbased networks can carry different types of traffic at different speeds over an optical channel. So using the Wavelength Division Multiplexing Technology ,planning of network for the fiber optic transport system will be done.


At low transmission rates data can also be transferred via an electrical interface. The method was developed to replace the Plesiochronous Digital Hierarchy PDH system for transporting large amounts of telephone calls and data traffic over the same fiber without synchronization problems.

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This synchronization system allows entire inter-country networks to operate synchronously, greatly reducing the amount of buffering required between elements in the network. Therefore, it is inaccurate to think of SDH or SONET as communications protocols in and of themselves; they are generic, all-purpose transport containers for moving both voice and data. Hence it has developed to replace the PDH. SDH stands for synchronous digital hierarchy. SONET stands for synchronous optical networking. Dense wavelength division multiplexing DWDM refers Originally to optical signals multiplexed within the nm band so as to leverage the capabilities and cost of erbium doped fiber amplifier EDFAs , which are effective for wavelengths between approximately — nm C band , or — nm L band.

Dense wavelength division multiplexing DWDM is a technology which multiplexes a number of optical carrier signals onto a single optical fiber by using different wavelengths i. This technique enables bidirectional communications over one strand of fiber, as well as multiplication of capacity. Dense Wavelength Division Multiplexing DWDM is a technology that allows multiple information streams to be transmitted simultaneously over a single fiber at data rates as high as the fiber plant will allow e. The DWDM approach multiplies the simple 2. An intermediate line repeater is place approximately every km to compensate for the loss of optical power as the signal travels along the fiber.

Between multiplexing and demultiplexing points in a DWDM system, there is an area in which multiple wavelengths exist The OSC carries information about the multi-wavelength optical signal as well as remote conditions at the optical terminal. It is form of an optical add drop multiplexer.

In fiber optics, a reconfigurable optical add-drop multiplexer ROADM is a form of optical adddrop multiplexer that adds the ability to remotely switch traffic from a wavelength-division multiplexing WDM system at the wavelength layer. This is achieved through the use of a wavelength selective switching module. The main advantages of the ROADM are: The planning of entire bandwidth assignment need not be carried out during initial deployment of a system.

The configuration can be done as and when required without affecting traffic already passing the ROADM. ROADM allows for remote configuration and reconfiguration. In ROADM, as it is not clear beforehand where a signal can be potentially routed, there is a necessity of power balancing of these signals. ROADMs allow for automatic power balancing. The below Flow Chart will give a general overview of the Process Involved during an individual project phase. This completes network planning completely. Every Project is identified by a six digit Project Number. The equipment list will consists of all the hardware required for each site being added in a Network.