Wavelength Multiplexing. The Target

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1 The Target Design a MAN* like fiber network for high data transmission rates. The network is partial below sea level and difficult to install and to maintain. Such a fiber network demands an optimized minimum of cables, connections and a minimum of active (electronic) components c.q. modules. (simplicity) What to achieve: High data rates Reliability (Low failure rates) Decrease of power needs Long-term stability Maintainability Low volume mechanics Openness (easy to provide) adorable Costs Conclusions *Metropolitan Area Network VLVnT Wavelenght Multipexing 1

2 Methods to increase data rates on one carrier Increase the bit rate (transfer 10 Mbps to 100 Mbps etc.) SDM FDM space domain multiplexing (parallel cabling) frequency domain multiplexing (O)TDM time domain multiplexing (data share time slots) WDM wave length division multiplexing VLVnT Wavelenght Multipexing 2

3 TDM/FDM Ethernet switch Bit rate 100M Ethernet 100M Ethernet mux 1GbE SONET/SDH* originalopticaltransport of TDM data TELCO (telephone) DS0 64 Kbps DS Mbps DS Mbps DS Mbps Bit rate ** OC Mbps STS-12/STM4 OC Mbps STS-48/STM-16 OC Mbps STS-3/STM-1 OC Mbps mux OC Mbps (OC Gbps) * Synchronous Optical NETwork/Synchronous Digital Hierarchy ** Optical Carrier VLVnT Wavelenght Multipexing 3

4 Bandwidth efficiency Wavelength Multiplexing Carrier Efficiency and WDM Ethernet SONET/SDH ~bit rate Mbps used bandwidth 10BASE-T STS % 100BASE-T STS-3/STM % 1000BASE-T STS-48/STM % WDM 100% bandwidth (excluding redundancy channels): (Figures from CISCO) WDM assigns different optical signals to different specific wavelength. The specific wavelength are multiplexed and injected in one fiber. Any optical input signal with sufficient S/N ratio ITU l n+0 ITU l n+1 ITU l n+2 ITU l n+3 ITU l n+4 MUX ITUl nx DEMUX ITU l n+0 ITU l n+1 ITU l n+2 ITU l n+3 ITU l n+4 VLVnT Wavelenght Multipexing 4

5 Standarisation on DWDM and CDWM channels International Telecommunication Union T (standardization) (was CCITT) Bit Rate (Gbs) Channel Spacing (GHz) 100/50 200/100/ *Spectral Efficiency η (%) 2.5/5.0 5/10/20 40 ITU channel specification for DWDM ( nm to nm) For 50 GHz offset: 300 channels -> in OA range: 150 channels For 100 GHz offset: 150 channels -> in OA range: 75 channels ITU channel specification for CWDM (1214 nm to 1610 nm) attenuation For ~ 2.5 THz offsets: 18 channels -> in OA range: 4 channels *Depends on digital bit format RZ, NRZ,optical SSB analog signals calculation Channel space l nm VLVnT Wavelenght Multipexing 5

6 Wavelength Multiplexing Close view CDWM channels NIK HEF VLVnT Wavelenght Multipexing 6

7 Spectral Overview optical power loss db/km Multi mode O band optical amplifier bands (EDFA s (1530 to 1620 nm)) S band C band L band 1 0 Intrinsic scattering Intrinsic absorption wavelength nm uv visible infra red ITU DWDM channels nm to nm ITU CWDM 18 channels 1214 nm to 1610 nm VLVnT Wavelenght Multipexing 7

8 Simple path for data requirement and transport ITU l n0 nx OADM*** ITU l n0 nx multiple wave DFB CW Laser* ITU l n n+1 n+.. n+x MUX l n l n optical add/drop multiplexer OA** DEMUX ITU l n n+1 n+.. n+x ITU l n long distance external modulator long distance One fiber Optical output dbm ITU l n wavelength nm electric signal e.g. Mach-Zehnder mod. termination * Distributed Feed Back Continuous Wave Laser ** optional Optical Amplifier (EDFA or SOA) *** optical add/drop multiplexer VLVnT Wavelenght Multipexing 8

9 Some technical aspects on fiber Many optical parts are passive and bi-directional (No optical to electric to optical needed) All optical switching Care for dispersion compensation Restoration optical power if necessary Many manufactures Attenuation and dispersion time fiber time Optical isolator Erbium-doped fiber Ca 15 m Optical isolator Dispersion compensating fiber Pump laser 980 nm or 1480 nm Pump laser 980 nm or 1480 nm VLVnT Wavelenght Multipexing 9

10 Data Transport technologies transport layer to physical layer examples IP IP ATM SONET/SDH IP IP GbE Optical layer Free format IP ATM SONET/SDH Gigabit Ethernet 1GbE / 10GbE Fiber Channel FDDI SONET/SDH Gigabit Ethernet 1GbE/10GbE Fiber Channel FDDI IP ATM IP ATM (Async. Transfer Mode) DWDM IP ATM Free format Dedicated slow control Clock signal (Any analog signal?) Dedicated slow control Clock signal (Any analog signal?) Free format VLVnT Wavelenght Multipexing 10

11 Protection System A DWDM system needs an protection system also. e.g.redundant fiber routing λ x11,x12,.x18 Dedicated Protection Switch λ X1,.xn DWDM syst. Sea hub λ x1,x2,.x8 Sonet: APS (Automatic Protection Switch) VLVnT Wavelenght Multipexing 11

12 Protection System λ x11,x12,.x18 Dedicated Protection Switch λ X1,.xn DWDM syst. Sea hub λ x1,x2,.x8 Sonet: APS (Automatic Protection Switch) VLVnT Wavelenght Multipexing 12

13 Configuration example DWDM ring structure outer ring data Inner ring net control inner ring data outer ring net control Line connection Mesh connections? Section hub box Switching OADM Junction station Protection ring Shore station instrumentation Junction Station Amplification switches 2 DWDM rings for data and protection In both rings optical survey system VLVnT Wavelenght Multipexing 13

14 Available optical components (our box of bricks) Direct modulated laser Optical modulator with CW laser Wavelength converter Optical add/drop converter Wavelength Multiplexer / demultiplexer (and bi-directional types) Broadband amplifier (SOA, EDFA, Raman types) Splitter All Optical Switch Circulator Detectors (light sensitive diode s) (All optical delay line, all optical flip-flop and more) VLVnT Wavelenght Multipexing 14

15 Conclusions Design a whole optical DWDM network. It is the physical layer of the data and control system Advantages: We can start from scratch Many point to point connections can be established (fixed or switched) No dedicated optical-electrical-optical repeaters are needed. Many transport protocols and dedicated signals possible. All signals on one fiber are amplified with a single optical amplifier Many components are passive and don t need electrical power. Less connectivity A providing network with transparent point to point connections makes it easy to implement various hardware and software designs. Disadvantages A special optical network surveyor and server has to be implemented so, Redundant network add-ins must be implemented to avoid catastrophes Costs to be calculated: less electrical power cheaper cables (less fiber) expensive connections less electronic circuits (e.g. Sonet every up speed of data is an opt.-elec.-opt. issue) expensive amplifiers VLVnT Wavelenght Multipexing 15

16 The question is not: Weather we will have Gigabit networks in the future The question is: When we will have Gigabit networks in the future available Saying From: 1. National coordination office for HPCC (High performance Computing and Communication) 2. The Corporation for National Research Initiatives 3. IEEE communications Society Technical Committee on Gigabit Networking VLVnT Wavelenght Multipexing 16

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