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Technologies for 40G Systems - Testing Issues at High Bitrates

Technologies for 40G Systems - Testing Issues at High Bitrates. Ines Brunn Lab & Manufacturers Solutions Manager Ines.Brunn@jdsu.com. The Need for Speed in Transmission Networks. 100GE. Ethernet. 40GE . Increase of capacity by 4 and by 10. ?. SDH/SONET. 10GE. 40G. 1GE. 43G.

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Technologies for 40G Systems - Testing Issues at High Bitrates

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  1. Technologies for 40G Systems - Testing Issues at High Bitrates Ines Brunn Lab & Manufacturers Solutions Manager Ines.Brunn@jdsu.com

  2. The Need for Speed in Transmission Networks 100GE Ethernet 40GE Increase of capacity by 4 and by 10 ? SDH/SONET 10GE 40G 1GE 43G OTN G.709 100BASE 40G 10BASE 10.7G 10G 2.7G 40G technology is ready 2.5G 622M OPEX reduction by - Saving footprint - Saving power consumption - Fewer points of failure 155M end 80‘ end 90 2006‘

  3. 40G Trends • High bandwidth demand driven by IPTV, VoIP and VoD • 40/43G field installation taking place

  4. Example of 40/43G Transport System OTU FAS OPU FEC Client ODU • Router connectivity 40G • Interconnect at OTU3 layer Client InterfacesLine Interfaces Terabit Router 40 Gb/s OTN G.709 FEC STM-256/OC-768 MUX 43 Gb/sOTU3 • modulation formats and FEC • (proprietary) OTN Service

  5. Different 40G Deployments New services, new technologies at the network edge, growing traffic. Traffic will be aggregated in powerful core routers. short reach IF on routers reducing the number of interconnecting fibers within CO lowering cost, space and power consumption long-haul networks lowering cost per managed bit per km possible migration to existing line systems metro-regionalnetworks (city hopper application) reducing the up-front cost compared to CWDM/DWDM Metro Networks Regional Networks Metro Core

  6. ROADM (1) Long Haul ROADM ROADM ROADM (2) Metro ROADM (3) ROADM ROADM (4) Access ROADM (5) Different ROADMs 1. LONG HAUL >400 km distances 80+ channels 2D+ 40G compatibility <10 channel add/drop 50GHz 2. LONG HAUL – METRO INTERCONNECT 40 channels 4D+ 5x1 WSS 40G compatibility <10 channel add/drop 50GHz 3. METRO 40G compatibility <10 channel add/drop 100GHz 10-400 km distances 40 channels 4. METRO – ACCESS INTERCONNECT <10 channel add/drop 100GHz 40 channels 4D+ 1x9 WSS 5. ACCESS 2-4 channel add/drop 100GHz <40 km distances 40 channels

  7. Advanced Modulation Technologies

  8. Technical Challenges for 40G Transmission (vs 10G) • 4x greater optical signal bandwidth • 16x reduction of dispersion tolerance • dispersion slope now important • 4x reduction of Rx sensitivity • 4x reduction of OSNR tolerance • 4x reduction of PMD tolerance • Weaker tolerance to optical nonlinearities • Increased departure of electronics performance from the ideal • Requires more accurate transmission fiber characterization

  9. 90o 90o Modulation Format Landscape Direct Detection Coherent Phase Detection • Modulate amplitude only • Simple Tx and Rx • Baud rate: equal to bit rate • Encode phase of bits • Coherent detection recovers full E-field • Enables electronic CD and PMD compensation • Electronic polarization demultiplexing • Tx DFB serves as local oscillator • Baud rate: ½ to ¼ of bit rate • Increased tolerance to CD & PMD • Lower bandwidth electronics OOK Differential Phase Detection • Encode phase relationship of adjacent bits • “0”: same relative phase • “1”: p relative phase • 1-bit delay for phase comparison and balanced Rx • Baud rate: ½ to 1 of bit rate 90o QPSK 90o DPSK DQPSK

  10. Modulation Format Performance (43G) Winzer and Essiambre, J. Lightwave Technol. Vol. 24, p. 4711, 2006

  11. JDSU Viewpoint • JDSU recognizes ODB/DPSK as preferable to address metro and regional applications @ 40G • JDSU recognizes RZ-DPSK or RZ-DQPSK/QPSK as preferable to address LH and ULH applications @ 40G • QPSK and Coherent Rx is the best pathway to 100G applications • JDSU is actively enabling 40G support across all segments of AON networks • 40G will happen over 50GHz, with advanced modulation schemes which are also more CD and PMD tolerant

  12. International standards Network equipment and test equipment

  13. International Standards Related to 40/43G • SDH • G.707 Framing, Overhead, Mapping • G.693 Optical Interfaces • SONET • Telcordia GR-253 (December 2005) • ANSI/OPTXS T1.105 Framing, Overhead, Mapping • OTN • G.709 Framing, Overhead, Mapping • G.693 Optical Interfaces • Jitter • O.172, G.825 for SDH • O.173, G.8251 for OTN

  14. 40/43G Testing Applications

  15. Segmentation of Tested 40/43G Devices 40/43G Testing Line Interface – Functions – Sensor - Synchronization Transponder & Interfaces Network Elements & Systems Live Networks Linecards &Sub-Systems Components -switches ROADMs Wavelength Management subsystem, Repeaters Transmission Systems, Cross-connects, ADMs, ROADM Nodes… Line Cards Amplifiers

  16. Electrical Testing on 40/43G Components • Functional testing • - Unframed/framed BERT MOD electrical 40/43G optical DEM • Modulation formats • ODB (Optical Duobinary NRZ) • = PSBT (Phase-Shaped-Binary-Transmission) • RZDPSK (RZ Differential-Phase-Shift-Keying) • QPSK(Quadrature Phase shift Keying) • CRZ (Chirped RZ) • CSRZ (Carrier-suppressed RZ) • DRZ (Duobinary RZ)

  17. 40/43G Transponder Testing Power supply Clock gen. Test board MUX SFI-5 optical 40/43G Line time DMX CDR 16MHz SFI-5 2.5G Transponder • Interface testing • - Optical parameters • - Jitter Testing: Jitter Generation/MTJ/JTF • Functional testing • - Unframed/framed BERT

  18. 40/43G Network Element & Network Testing client line NE MUX optical 40/43G optical 43G DMX Interface testing • Electrical & optical parameters • Jitter testing Functional testing • BERT • OTN Mapping/Demapping • Connectivity test (path trace) Sensor testing • Alarm & Error stress Synchronization testing • Jitter & Wander • Pointer

  19. Jitter Applications in Telecom and Datacom Network DUT DUT

  20. Jitter Standards for 40/43G Network Equipment Test Equipment SONET OC-768 SDH STM-256 OTN OTU3 SDH STM-256 OTN OTU3 Telcordia GR-253 ITU-T G.825 ITU-T G.8251 ITU-T O.172 ITU-T O.173 20k-320M 1200 mUI 16M-320M 100 mUI tbd (G.8251-ODCp) G.783 (REG A) 16M-320M 100 mUI 20k-320M 1200 mUI 16M-320M 100 mUI 80k-320M 150 mUI 16M-320M 50 mUI 20k-320M 200 mUI 16M-320M 50 mUI Generation Receiver fixed error W 20k-400k 6000 mUI 16M-320M 150 mUI 20k-400k 6000 mUI 16M-320M 150 mUI tbd Tolerance 40k-4M 0.1 dB 4M-320M 20dB/dec 40k-4M 0.1 dB 4M-320M 20dB/dec tbd Transfer

  21. Q & A Thank you for your attention Ines.Brunn@jdsu.com

  22. JDSU ONT Test Solution • 40G SDH/SONET • SONET OC-768 with STS-1 Mappings • SDH STM-256 with AU Mappings • Alarm, Error, Pointer Generation & Analysis • Overhead Generation & Analysis • Overhead Capture • 43G OTN • OTN with ODU3 Mapping with SDH/SONET Client or PRBS test signal • Alarm, Error Generation & Analysis • Overhead Generation & Analysis • Overhead Sequencer & Capture • FEC Generation & Analysis incl. Stress test • Synchronous and Asynchronous Mapping • Wrapper & Dewrapper Testing • 40/43G Unframed • Alarm, Error Generation & Analysis 40/43G optical & electrical unframed & framed Jitter &Wander 40G optical unframed framed

  23. JDSU TestPoint Test Solution • General • Bit rate coverage: 40/43G • Production line testing • Multiple ports per unit • Field upgradeable from 40G to 40G/43G • SDH/SONET • STM-256/OC-768 signal • Disruption time measurement • G.828 Performance Monitoring • Alarm, Error, Pointer Generation & Analysis • Overhead Generation & Analysis • OTN • Detailed FEC evaluation • Alarm, Error, Pointer Generation & Analysis • Overhead Generation & Analysis TS-30 TS-170 40Gbps module

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