The Evolution of Optical Transport Networks
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1 The Evolution of Optical Transport Networks Rod C. Alferness Chief Technology Officer - Optical Networking Group Lucent Technologies SPARTAN Symposium - 5/20/98 Page 1
2 Network Architecture Dynamics... in a dramatically changing landscape Explosive Growth of Data fueled by Internet & Intranets Demand for Low Cost Bandwidth ($/Mb) fueled by competition Need for Reliable, Predictable Bandwidth VPNs, Intranets Internet Commerce Market Forces Technology Drivers Network Architecture Evolution parallel service layer networks (IP,, PSTN, etc.) unifying transport layer of DWDM & (SONET/SDH) DWDM expands from core toward edge restoration at the optical layer Optical Networking Technology number of wavelengths total capacity wavelength management Router Technology throughput QoS mechanisms Page 2
3 Increasing Transmission Capacity in Wavelength and Time Domains Page 3
4 Ultra-Wideband EDFA 30 C-Band L-Band Gain (db) nm Noise 6.5 db Output Power 24.5 dbm 43.5 nm Total 3dB Bandwidth = 84.3 nm Wavelength (nm) Noise Figure (db) Page 4
5 1 Tb/s Experiment: Channel Spectrum Page 5
6 40Gb/s Waveform After 85km TrueWave 10ps/Div. Page 6
7 30 Wavelength Spectra Transmitter Output Receiver Input Page 7
8 Flexibility, Efficiency, & Reliability Selective Layered Bandwidth Management Broadband Circuit Wideband Circuit Cell Relay Frame Relay IP/ IP over SONET/SDH IP over WDM Next Big Thing? AAL 5 IP PPP/HDLC SDL NBT? Optical Page 8
9 Selective Layered Bandwidth Management Today Wideband & Broadband Circuit Frame Relay Native LAN Cell Relay IP: VPN IP: Best Effort Service- Optimized Virtual Backbones IP PPP/HDLC Unified Transport Infrastructure DWDM Rapid expansion of core capacity via DWDM Overlaid with circuit,, & IP virtual backbones Page 9
10 Network Example - IP Transport Today IP//SONET connection IP//SONET/ON connection IP/SONET/ON connection Service Layer SONET Layer IP end-to-end thread logical connection Optical Networking Layer Access Metro Core Page 10
11 Selective Layered Bandwidth Management Mid Term Wideband & Broadband Circuit Wideband Circuit Frame Relay Native LAN Cell Relay IP: Best Effort & Differentiated Services Service- Optimized Virtual Backbones IP SDL Unified Transport Infrastructure Optical Networking DWDM with restoration, OAM&P, and flexible bandwidth management becomes Optical Networking layer, expands into Metro IOF Page 11
12 Network Example - IP Transport Mid Term IP//SONET connection IP/SONET/ON connection IP/ON connection Service Layer SONET Layer IP end-to-end thread logical connection wavelength add/drop Optical Networking Layer Access Metro Core Page 12
13 Selective Layered Bandwidth Management Long Term BB circuit Wideband Circuit Frame Relay Native LAN Cell Relay IP (all classes) Clear channel Service- Optimized Virtual Backbones IP SDL Unified Transport Infrastructure Optical Networking Optical Networking layer expands into access Optical Cross-connects support clear channel services, mesh restoration, & efficient expressing Page 13
14 Network Example - IP Transport Long Term IP/SONET/ON connection IP/ON connection IP/ON connection Service Layer SONET Layer XC XC XC XC XC XC Optical Networking Layer IP end-to-end thread backup optical paths logical connection Access Metro Core wavelength add/drop Page 14
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