Book contents
- Frontmatter
- Contents
- Figures
- Tables
- Preface to the Second Edition
- Acknowledgments
- Multiwavelength Optical Networks
- 1 The Big Picture
- 2 The Layered Architecture and Its Resources
- 3 Network Connections
- 4 Enabling Technology
- 5 Static Multipoint Networks
- 6 Wavelength/Waveband-Routed Networks
- 7 Logically-Routed Networks
- 8 Survivability: Protection and Restoration
- 9 Optical Control Plane
- 10 Optical Packet-Switched Networks
- 11 Current Trends in Multiwavelength Optical Networking
- A Graph Theory
- B Fixed Scheduling Algorithm
- C Markov Chains and Queues
- D A Limiting-Cut Heuristic
- E An Algorithm for Minimum-Interference Routing in Linear Lightwave Networks
- F Synopsis of the SONET Standard
- G A Looping Algorithm
- Acronyms
- Index
2 - The Layered Architecture and Its Resources
Published online by Cambridge University Press: 05 June 2012
- Frontmatter
- Contents
- Figures
- Tables
- Preface to the Second Edition
- Acknowledgments
- Multiwavelength Optical Networks
- 1 The Big Picture
- 2 The Layered Architecture and Its Resources
- 3 Network Connections
- 4 Enabling Technology
- 5 Static Multipoint Networks
- 6 Wavelength/Waveband-Routed Networks
- 7 Logically-Routed Networks
- 8 Survivability: Protection and Restoration
- 9 Optical Control Plane
- 10 Optical Packet-Switched Networks
- 11 Current Trends in Multiwavelength Optical Networking
- A Graph Theory
- B Fixed Scheduling Algorithm
- C Markov Chains and Queues
- D A Limiting-Cut Heuristic
- E An Algorithm for Minimum-Interference Routing in Linear Lightwave Networks
- F Synopsis of the SONET Standard
- G A Looping Algorithm
- Acronyms
- Index
Summary
Ultimately, the performance of a network is limited by the quantity and functionality of its physical resources. In this chapter we examine the various functions performed in a multiwavelength network, emphasizing the role of the optical resources (located in the physical layer of Figure 1.3) in providing connectivity and throughput. For the most part we use the terms transparent optical, purely optical, and just optical interchangeably to refer to entities in the physical layer. The implication is that there is a clean break between the underlying technology and functionality in the physical layer and that in the logical layer. The physical layer contains optical components executing linear (transparent) operations on optical signals, whereas the logical layers contain electronic components executing nonlinear operations on electrical signals. In reality, as mentioned in Chapter 1, the picture in real networks is more nuanced. For example, some simple signal processing (either electronic or optical) may be present in the physical layers of today's networks, making them “opaque” to a greater or lesser degree. Conversely, as optical technology for signal processing matures, it is beginning to make its way into the logical layers. Nevertheless, the somewhat simplified view of a transparent (linear) optical layer underlying an electronic (nonlinear) logical layer is very helpful in providing a generic model for most multiwavelength networks. It will be used throughout this book, with exceptions duly noted as they appear. To provide a proper framework for the discussion that follows, we start in Section 2.1 with a description of layers and sublayers of the multiwavelength network architecture.
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- Multiwavelength Optical NetworksArchitectures, Design, and Control, pp. 28 - 90Publisher: Cambridge University PressPrint publication year: 2008