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Paul Lagasse Dept. of Information Technology Ghent University OPTICAL NETWORK EVOLUTION IST May 2001.

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Presentation on theme: "Paul Lagasse Dept. of Information Technology Ghent University OPTICAL NETWORK EVOLUTION IST May 2001."— Presentation transcript:

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2 Paul Lagasse Dept. of Information Technology Ghent University OPTICAL NETWORK EVOLUTION IST May 2001

3 MJO’Mahony, Univ. of Essex Technology Drivers Global Area Network Wide Area Network Metropolitan/Regional Area Optical Network Corporate/ Enterprise Clients GAN Capacity 10 Tb/s/fibre (2015) Max transmission speed 100 Gb/s Unregenerated distance > 10,000 km WAN Capacity Tb/s/fibre Max transmission speed, 40 Gb/s Unregenerated distance  3000 km OXC: >5000 x 5000 MA(O)N Capacity: ? Distance: km OADM Dimensions:? Client/Access Integrating IP&Backbone (control) Gigabit Ethernet: low cost WDM Services Fast provisioning Cable modem Networks Client/Access Networks FTTH Mobile SDH/ SONET ATM PSTN/IP ISP Gigabit Ethernet Cable FTTB ATM

4 WDM / OTN SDH ATM IP Pt to Pt WDM FRAMING IP MPLS -networking Network Evolution

5 Telscom Consulting, Switzerland 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

6 MJO’Mahony, Univ. of Essex Global Area Network Capacity 10 Tb/s/fibre (2015) Max transmission speed 100 Gb/s Unregenerated distance > 10,000 km Technology Issues : Transmission options:OTDM+WDM 100 nm amplification band  Raman +C (1540 nm) +L (1580) bands  128 channels (100 Ghz spacing) 100 Gb/s per channel Key Component & Subsystems:Optical amplifiers Dispersion compensation (over 100 nm) Other issues:Trade off between channel speed and wavelength number Linear/Non-linear transmission

7 MJO’Mahony, Univ. of Essex WAN Network OXC Capacity Tb/s/fibre Max transmission speed, 40 -? Gb/s Unregenerated distance  3000 km OXC: >5000 x 5000 Technology Issues: Network level:Optical circuit switching (wavelength routing) Optical packet switching Transmission options:OTDM+WDM 40 Gb/s per channel 1000 channels -400 nm amplification band  nm  1000 channels (50 GHz spacing) NB: for WAN more channels at lower bit rate gives greater flexibility Key Component & Subsystems:Optical amplifier configurations for 400 nm OXC: 1000 wavelengths x 30 (?) fibres = 30000x thus new multilevel architecture necessary Mulitplexers/demultiplexers (for 1000 channels) Wavelength converters Tuneable lasers

8 MJO’Mahony, Univ. of Essex Metropolitan Area Optical Network WAN Client/Access Network level:wavelength division multiplexing/wavelength access access protocol? Transmission options:WDM Gb/s per channel 1000 channels -400 nm amplification band  nm  1000 channels (50 GHz spacing) NB: for WAN more channels at lower bit rate gives greater flexibility Key Component & Subsystems:Low cost components OADM MA(O)N Capacity: ? Distance: km OADM Dimensions:?

9 Telscom Consulting, Switzerland Evolution: Copper TPs WAN SN STM-4/16 speed level ADMAdd Drop Multiplexer ADSLAsymmetric digital subscriber Line ISDNIntegrated Services Digital Network OADMOptical access multiplexer OANTOptical Access Network Termination OXCOptical Cross Connect SNService Node SOHOSmall Office, Home Office VDSLVery High Speed Digital Subscriber Line WANWide Area Network (all fiber) STM-64+ speed level DWDM Optical Access Network OANT FTTB/H Gateway Router Regional / Metro Large Enterprises Service Interfaces House Wiring LANs Medium Businesses SOHO Residential OADM OXC OADM OANT FTTC Gateway Router VDSL POTS, ISDN UTP-Cable

10 Telscom Consulting, Switzerland Coax Cell Evolution: Coax Cable, HFC Optical Access Network CATV Back Bone WAN Regional / Metro (Data Back Bone) Digital & Analog HFC Head-end STM-4/16 speed level CATVCable Television CGWCoax Gate Way CMCable Modem CMTCable Modem Termination HFCHybrid Fiber Coax OADMOptical Add Drop Multiplexer OANTOptical Access Network Termination OXCOptical Cross Connect SNService Node SOHOSmall Offices, Home Offices WANWide Area Network (all fiber) STM-16/64 speed level DWDM Coax Cell CGW CM Large Enterprises SN Coax Cell Digital & Analog OANT Digital & Analog OANT Digital & Analog OANT CGW Coax 5 to 1000MHz Downstream: FDM (AM VSB, QAM) Upstream: FDMA/TDMA (QAM) Service Interfaces House Wiring LANs Broadcast Services CGW Residential Medium Businesses SOHO Residential Data Modems (CMTs) moving to the OANTs Frequency Reuse in the Coax Distribution Cells OXC Router OADM Router OADM Router OADM Router

11 Telscom Consulting, Switzerland Passive Optical Network PON ODN d 1, d 2,... d N u 1, u 2,... u M d i, u k fixed/config. d q, u r fixed/ configurable d, u variable Regional Metro OLT RX TX TX 4 TX RX1 TX1 Demux Mux TX RX OANT Mux Router TX RX OANT Mux Router TP-Cable VDSL POTS, ISDN FTTBuilding In_House Network / LAN Medium Businesses SOHO Residential FTTCurb SOHO Residential FTTBuilding/Desque In-House Network / LAN Enterprises Big Businesses ADMAdd Drop Multiplexer ADSLAsymmetric digital subscriber Line ISDNIntegrated Services Digital Network NTUNetwork Termination Unit OANTOptical Access Network Termination ODNOptical Distribution Network OLTOptical Line Termination SOHOSmall Offices, Home Offices OANT Mux Router TX RX Downstream: TDM / (D)WDM Upstream:TDMA / (D)WDM In-House Network NTU Layer 1, 2 and 3

12 Telscom Consulting, Switzerland Active Star Coupler Passive Optical Star Network (LAN) TX sd RX su Control Node Optical Terminal 1 Optical Terminal 2 Optical Terminal n RX (i=1,...n) su + 2 passive optical Combiner passive optical Splitter optical amplifier 3R-Regeneration RX TX1 TX2 TXn RX su + 1 su + n 1000BaseLX/SX/CX 10’000BaseLX IP Layer 1, 2 and 3 Control Channels su sd sd + i Regional / Metro OSI Model Layers: 1Physical 2Data Link (Including Medium Access Control) 3Network (e.g. IP Address Resolution Protocol ARP, Routing, “Distributed Ultra High Speed Router”)

13 Telscom Consulting, Switzerland Optical Ring / Star Network I/O 1 Mutliplexer RX TXRX TX I/O 2 I/O N Access Interfaces , 2Transfer 3, 4Drop 5, 6Add 7, 8Loop Back (Restoration) AN Access Network Regional / Metro UTP-Cable AN to the Building Enterprises Big Businesses FTTBuilding / Active Star: FTTCurb / DSL SOHO Residential UTP-Cable Medium Businesses SOHO Residential Fiber or Copper

14 Ultra high bit rate transmission experiments Source: LEOS Newsletter 10/99, OFC‘2000, ECOC‘2000, OFC‘2001

15 Component technologies and trends Emerging component technologies Packet switched optical networks Point-to-point systems Wavelength converters Routers Switches 3R repeaters Dispersion compensators Receivers Light sources Fibers Amplifiers Optical buffers Circuit switched optical networks

16 Wavelength conversion and regeneration - example  Input signal SOA CW Output signal Regeneration and wavelength conversion obtained - conversion over 80 nm possible Regeneration and wavelength 40 Gbit/s

17 Emerging component technologies Emerging component technologies Microoptics and Nanoelectronics MOEMS Photonic bandgap devices Quantum dot devices Carbon nanotubes Polymer optoelectronics Quantum Communication Cryptography Computing Teleportation

18 MicroOptoElectroMechanical Systems (MOEMS) Characteristics of MOEMS Size:microns to mm scaleSpeed:100 ’s of nanoseconds to 1s Scalability: 1 to 10 6 components What is the MOEMS ? Cost:cost of chip + assembly/package Optical ElectricalMechanical Electro- Optical Opto- Mechanical Electro- Mechanical MOEMS Actuation energy: CV 2 /2(electrostatic)

19 k Normalised wavevector k  /2  0.5 Bandgap Normalised frequency  c 1-D periodic structure Band diagram Waves in periodic structures

20 Photonic bandgap structures for compact photonic ICs Schematic diagram of a photonic bandgap waveguide SEM picture of a PBG waveguide in silicon-on-isolator From IST project PICCO

21 PBG-waveguides Numerical calculation of an electromagnetic field propagating in a T-shaped PBG waveguide T. Sondergaard and K. Dridi, Phys. Rev. B, Vol. 61, p , 2000


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