TutoriaI of IP over Optical Networks

Optical Networks

Fiber

•Provides the physical transport medium

Optical networks: Create the pipes

•WDM: Fast pipes for voice/data

•Optical amplification: Long pipes

IP Routers, ATM switches, SDH equipment: Fill the pipes

Operations Support System (OSS)

•Manage all aspects of the network

 

 

 

Evolution of Transmission Technology

•1st Generation: Copper is transmission medium

•2nd Generation: Optical Fiber (late 80s)

4Higher data rates; longer link lengths

•Dense Wavelength-Division Multiplexing (DWDM, 1994)

4Fiber exhaust forces DWDM

4Erbium-doped fiber amplifiers (EDFAs) lower DWDM transmission cost

•3rd Generation: Intelligent optical networking (1999)

4Routing and signaling for optical paths

Dense Wavelength-Division Multiplexing (DWDM)

 

 

DWDM Evolution

 

•Faster (higher speed per wave),

440 Gb/s on the horizon

•Thicker (more waves),

4160 waves possible today

•Longer (link lengths before regeneration)

4A few thousand km possible today

•160 waves at 10 Gb/s = 1.6 Tb/s

425 million simultaneous phone calls

45 million books per minute

 

IP over ATM

ATM over SONET

IP over ATM over SONET

 

Optical Pass-Through (Routing)

Intelligent Optical Networking

Optics is not merely a transmission technology

•Optics provides a flexible layer upon which to deliver network service

DWDM provides enormous link capacities

•DWDM: Physical layer of Intelligent Optical Network

Routing and signaling of optical paths

•Provides significant economies over conventional network architectures

•Enables revolutionary new services

42.5 Gb/s path from Bangalore to Boston, on demand!

 

SONET over Optical Layer

IP over SONET over Optical Layer

IP over Optical Layer

 

IP over Intelligent Optical Networks

§Establish high-speed optical layer connections (lightpaths)

§IP routers connected through lightpaths rather than fiber

§Switching (WDM crossconnects) add flexibility to the optical layer

•Flexible, potentially rich, topology at IP layer