1. Chapter 7 WDM Network Elements A.Network Elements : a. Optical line terminals (OLTs) b. Optical add/drop multiplexers (OADMs) c. Optical crossconnects (OXCs) d. Fibers e. Switches B.Topologies : a. Ring b. Mesh

3. The features of this architecture a.Wavelength reuse b.Wavelength conversion c.Transparency d.Circuit switching e.Survivability f.Lightpath topology

4. 7.1 Optical Line Terminals Functional elements inside an OLT : a. Transponder b. Wavelength multiplexer c. Optical amplifier

5. 7.2 Optical Line Amplifiers OSC: Optical Supervisory Channel

6. 7.3 Optical Add/Drop Multiplexers

7. 7.3.1 OADM Architectures Features of OADM a. Total number of wavelengths b. Maximum number of wavelengths that can be dropped/added c. constraints on specific wavelengths that can be dropped/added d. How easy to add and drop additional channels e. Modularization f. Complexity of the physical layer g. Reconfigurability (software controllable)

11. 7.3.2 Reconfigurable OADMs

12. 7.4 Optical Crossconnects (OXCs)

13. Functions provided by an OXC in a large network a.Service provisioning b.Protection c.Bit rate transparency d.Performance monitoring, test access, and fault localization e.Wavelength conversion f.Multiplexing and grooming

16. 7.4.1 All-Optical OXC Configurations