The Evolution of Optical Transport Networks - KU · PDF fileThe Evolution of Optical Transport...
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The Evolution of Optical Transport Networks Rod C. Alferness Chief Technology Officer - Optical Networking Group Lucent Technologies SPARTAN Symposium - 5/20/98 Page 1
Transcript of The Evolution of Optical Transport Networks - KU · PDF fileThe Evolution of Optical Transport...
The Evolution of Optical TransportNetworks
Rod C. AlfernessChief Technology Officer - Optical Networking Group
Lucent Technologies
SPARTAN Symposium - 5/20/98
Page 1
Network Architecture Dynamics... in a dramatically changing landscape
Network Architecture Evolution• parallel service layer networks (IP, ATM, PSTN, etc.)
• unifying transport layer of DWDM & STM (SONET/SDH)• DWDM expands from core toward edge
• restoration at the optical layer
Explosive Growth of Data• fueled by Internet & Intranets
Demand for LowCost Bandwidth ($/Mb)• fueled by competition
Need for Reliable, Predictable Bandwidth
• VPNs, Intranets• Internet Commerce
Optical Networking Technology• number of wavelengths
• total capacity• wavelength management
Router Technology• throughput
• QoS mechanisms
Market Forces
Technology Drivers
Page 2
Increasing�Transmission Capacityin Wavelength and Time Domains
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0
10
20
30
1525 1550 1575 1600
5
10
15
Noise ≤ 6.5 dBOutput Power ≅ 24.5 dBm
L-BandC-Band
Total 3dB Bandwidth = 84.3 nm
43.5 nm40.8 nm
W a vel e ngth ( n m )
Ga
in (
dB
)
No
ise
Fig
ur e
(d
B)
Ultra-Wideband EDFA
Page 4
1 Tb/s Experiment: Channel Spectrum
Page 5
10ps/Div.
40Gb/s Waveform After 85kmTrueWave Fiber @1554.5nm
Page 6
30 Wavelength Spectra
Transmitter Output Receiver Input
Page 7
Flexibility, Efficiency, & Reliability
Selective Layered BandwidthManagement
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&UHDWLQJ�&UHDWLQJ�VHUYLFH�RSWLPL]HG�YLUWXDO�EDFNERQHVVHUYLFH�RSWLPL]HG�YLUWXDO�EDFNERQHVRQ�D�XQLILHG�LQIUDVWUXFWXUH���RQ�D�XQLILHG�LQIUDVWUXFWXUH���
ATM PPP/HDLC
STM
IP
SDLNBT
?
BroadbandCircuit
WidebandCircuit
FrameRelay IP/ATM
IP overSONET/SDH
IP overWDM
Next BigThing?
Optical
CellRelay
AAL 5
Page 8
Selective LayeredBandwidth ManagementToday
•• Rapid expansionRapid expansion of core capacity via DWDM• Overlaid with circuit, ATM, & IP virtual backbonesvirtual backbones
PPP/HDLC
STM
ATM
IP
DWDM
Service-Optimized
VirtualBackbones
Frame RelayNative LANCell Relay IP: VPN IP: Best Effort
Wideband & Broadband
Circuit
UnifiedTransport
Infrastructure
Page 9
Network Example - IP TransportToday
λ
λλ
STM STMSTM
λ
STM
ATM ATM
STM
STM STMSTM STM
STMSTM
STM
ATM
ATM
ATM
IP/ATM/SONET connectionIP/SONET/ONconnection
IP/ATM/SONET/ONconnection
λ
λ λ λ
ATM ATM
IP end-to-end threadlogical connection
CoreMetroAccess
SONET Layer
Optical Networking Layer
Service Layer
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Selective LayeredBandwidth ManagementMid Term Wideband Circuit
Frame RelayNative LANCell Relay
IP: Best Effort &Differentiated Services
Wideband & Broadband
Circuit
SDL
STM
ATM
IP
Optical Networking
Service-Optimized
VirtualBackbones
UnifiedTransport
Infrastructure
• DWDM with restoration, OAM&P, and flexiblebandwidth management becomes Optical NetworkingOptical Networkinglayerlayer, expands into Metro IOFMetro IOF
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Network Example - IP TransportMid Term
λ
λ
STM STM
ATM ATM
STM
STM
STM
ATM
ATM
ATM
IP/ATM/SONET connection IP/ON connectionIP/SONET/ONconnection
λλλ
ATM
STMSTM
ATM
STM
STM
ATM
λ
λλλλ
λ
ATM
STMSTM
STM
CoreMetroAccess
SONET Layer
Optical Networking Layer
Service Layer
IP end-to-end threadlogical connection
wavelength add/dropλ
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Selective LayeredBandwidth ManagementLong Term Wideband Circuit
Frame RelayNative LANCell Relay IP (all classes)BB circuit
Clear channelλ
SDL
STM
ATM
IP
Optical Networking
Service-Optimized
VirtualBackbones
UnifiedTransport
Infrastructure
• Optical Networking layer expands into accessaccess• Optical Cross-connects support clear channel clear channel λλ
services, mesh restoration, & efficient λ expressing
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Network Example - IP TransportLong Term
CoreMetroAccess
STM
SONET Layer
Optical Networking Layer
Service Layer
STM
ATM ATM
STM
STM
STM
ATM
ATM
ATM
IP/SONET/ON connection IP/ON connectionIP/ON connection
λ
ATM
STMSTM
ATM ATM
ATM
STMSTM
STM
λ
λ XCλ XC
STM
λλ
λ λ XC λ XC
λ XC
λλ XC
STM
IP end-to-end threadbackup optical paths
logical connection
wavelength add/dropλ
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