Optical add drop multiplexer in Optical Fiber Communication

In this pptx, I am trying to show about OADM working principle its classification and so on. Its gives u a basic idea about it

1. Presentation on Optical Add Drop Multiplexer 1

2. Outline Basics of OADM Component of OADM Types of OADM Configuration of OADM Function of OADM Application of OADM 2

3. An optical add-drop multiplexer (OADM) is a critical device that is used in the wavelength-division multiplexing systems for multiplexing and routing different channels of light into or out of a single mode fiber (SMF).It is one of the fundamental constructional blocks of the modern day telecommunications networks. OADM 3

4. Traditionally, an OADM has three major components which are responsible to carry out the task assigned to an OADM. These three components are given below: Optical Demultiplexer An Optical Demultiplexer separates the multiple of wavelengths in a fiber and directs them to many fibers Optical Multiplexer The optical multiplexer is used to couple two or more wavelengths into the same fiber A set of ports f or adding or dropping signals Figure: component of OADM Components of OADM 4

5. There are two main types of OADM that are widely used in communication networks, namely, Fixed OADM (FOADM) and Reconfigurable OADM (ROADM). An OADM with remotely reconfigurable optical switches in the middle stage is called a reconfigurable OADM (ROADM). Ones without this feature are known as fixed OADMs. Types of OADM 5

6. Fixed Optical Add-Drop Multiplexer (FOADM) FOADMs use fixed filters that add/drop a selected wavelength and pass the rest of the wavelengths through the node. Static wavelength-filtering technology eliminates the cost and attenuation to demultiplex all DWDM signals in a signal path. The solution is called FOADM because the wavelengths added and dropped are fixed at the time of add/drop filter installation on the optical path through a node. Reconfigurable Optical Add-Drop Multiplexers (ROADM) Reconfigurable Optical Add Drop Multiplexers (ROADMs) are used to provide flexibility in rerouting optical streams, bypassing faulty connections, allowing minimal service disruption and the ability to adapt or upgrade the optical network to different WDM technologies my electronically configuring the OADM to achieve the required functionality. 6

7. There are two basic configurations of an OADM: using dielectric thin-film filter (TFF) and fiber brag grating (FBG). For OADM configuration with TFF , an arbitrary signal wavelength is branched/dropped from wavelength-multiplexed signals via a narrow band-pass filter (BPF), whereby only the desired signal wavelength being transmitted while others reflected. Meanwhile, an arbitrary signal wavelength can be inserted/added into wavelength-multiplexed signals via a narrow BPF, whereby the desired signal wavelength being transmitted is combined with the reflected signal wavelengths. Configurations of OADM 7 Figure : Configuration of OADM with TFF

8. While configuring an OADM with FBG , the wavelength-multiplexed signals enter an FBG through a circulator, where only one arbitrary signal wavelength is reflected while others are transmitted. The reflected signal wavelength is branched/dropped into a port other than that where the wavelength-multiplexed signals enter. In the case of wavelength multiplexing an arbitrary signal wavelength, the signal wavelength incident on the circulator is reflected by the FBG and is inserted/added into the wavelength-multiplexed signals that are transmitted via the circulator. Figure : configuration of OADM with FBG 8

9. As the name indicates, an OADM can add one or more new wavelength channels to an existing multi-wavelength WDM signal, or drop/remove one or more channels, passing those signals to another network path. The OADM selectively removes (drops) a wavelength from a multiplicity of wavelengths in a fiber , and thus separating the signals from the particular channel. It then adds the same wavelength in the same direction of data flow, but with different data content. OADM is commonly used in WDM ring systems and in long-haul for more flexible configuration and higher capacity. Main Functions of OADM 9

10. Figure: Function of OADM 10

11. In conventional long-haul transmission systems, emphasis has been placed on how much capacity and how far the system can transmit. In metro/access networks, however, low cost and system flexibility are strongly required. OADM can verify both demands. The main battlefield of OADM application is in MAN (metropolitan area network), featuring high flexibility, easy upgrade and amplification. As an ideal multi-services transport platform in MAN application, OADM also allows different wavelength multiplexing signal at different locations. Another application for OADM is in Optical Cross Connection (OXC). Proposed equipment allow different network to connect dynamic, on-demand wavelength resources and a wider range of network interconnection. OADM and OXC only need to download the information in the nodes to send the person that handles the equipment, including ATM switchboard, SDH switchboard, IP router etc., which greatly improve the efficiency of the node to process information. Application of OADM 11

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