Ultra Ultra Long Long-Haul and High Haul and High-Capacity - - PowerPoint PPT Presentation

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Ultra Ultra Long Long-Haul and High Haul and High-Capacity - - PowerPoint PPT Presentation

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conference & convention enabling the next generation of networks & services Ultra Ultra Long Long-Haul and High Haul and High-Capacity Capacity 40 Gbps DWDM Transmission Systems 40 Gbps DWDM Transmission Systems over Trans-Pacific

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SLIDE 1 enabling the next generation of networks & services

conference & convention

Ultra Ultra Long Long-Haul and High Haul and High-Capacity Capacity 40 Gbps DWDM Transmission Systems 40 Gbps DWDM Transmission Systems

  • ver Trans
  • ver Trans-Pacific Distance

Pacific Distance

  • ver Trans
  • ver Trans-Pacific Distance

Pacific Distance

Takanori Inoue Takanori Inoue, Yoshihisa Inada, Lei Xu, , Yoshihisa Inada, Lei Xu, Takehiro Nakano, Ting Wang and Takaaki Ogata Takehiro Nakano, Ting Wang and Takaaki Ogata

NEC Corporation NEC Corporation

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SLIDE 2 enabling the next generation of networks & services

conference & convention

Outline

1. Introduction 2. 40Gbps System Design for Long Distance Transmission

Modulation Format Modulation Format Dispersion Map Optimization

3. 40Gbps Transmission Performance Assessment

Straight Line Experiment Loop Experiment

4. Conclusion

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SLIDE 3 enabling the next generation of networks & services

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Introduction

  • 10Gbps DWDM technologies for submarine cable systems

have been fully matured covering trans-pacific distance.

  • Channel spacing: 25GHz (Spectral efficiency: 0.4bit/s/Hz)
  • EDFA gain bandwidth: 40nm (~200ch)
  • Maximum Reach: <12000km
  • Submarine cable system deployment with 40Gbps
  • Submarine cable system deployment with 40Gbps

technologies is indispensable to meet the growing capacity demand for international communication.

  • Higher capacity capability (Higher spectral efficiency)
  • Lower cost per bit
  • Reduction of power dissipation
  • Equipment down-sizing (Reduction of footprint)
  • Seamless connection between terrestrial 40Gbps system
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SLIDE 4 enabling the next generation of networks & services

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10G to 40G Comparison

Difference between 10G and 40G parameters

Bit Rate 10Gbps 40Gbps Electrical Bandwidth 10GHz 40GHz Optical Spectrum Width 20GHz (0.16nm) 80GHz (0.64nm) Tolerance to CD

  • Typ. +/- 200 ps (DPSK)

1/16 of 10G Tolerance to PMD Typically 10 ps 1/4 of 10G Required OSNR 6dB higher than 10G Optical nonlinear penalty Higher than 10G

Key technologies for 40G system design

  • Baud rate reduction by multi-level modulation and polarization multiplexing
  • Coherent detection ( 2~3 dB sensitivity improvement )
  • Active CD and PMD compensation by digital signal processing
  • Optimum design of transmission line (Fiber, Dispersion map)
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SLIDE 5 enabling the next generation of networks & services

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Modulation Formats for 40G

Modulation Format Baud- Rate

  • Min. channel

spacing Optical Spectrum Constellation Map Max. Distance RZ-DPSK 40Gbps 100GHz (SE=0.4bit/s/H z ) < 6500km RZ-DQPSK 20Gbps 50GHz (0.8bit/s/Hz) < 5000km

50GHz 100GHz Im Re Im Re

DP-RZ-QPSK 10Gbps 25GHz (1.6bit/s/Hz) < 6500km DP-RZ-BPSK 20Gbps 50GHz (0.8bit/s/Hz) < 9000km SP-RZ-QPSK 20Gbps 50GHz (0.8bit/s/Hz) < 9000km

X-pol Y-pol Im Im Re Re 50GHz X-pol Y-pol X-pol Y-pol Im Im Re Re X-pol Y-pol 50GHz X-pol 50GHz Im Re

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SLIDE 6 enabling the next generation of networks & services

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10 11 12 13

  • r [dB]

Long Distance Transmission Capability

DP-RZ-QPSK

Constellation Map (-4dBm/ch)

System Length: 6500km, 60km span

SP-RZ-QPSK DP-RZ-BPSK

6 7 8 9 10

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1 Channel Power [dBm] Q factor

DP-RZ-BPSK SP-RZ-QPSK

DP-RZ-BPSK and SP-RZ-QPSK are promising for ultra long-haul.

RZ-DQPSK DP-RZ-QPSK

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SLIDE 7 enabling the next generation of networks & services

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Transmission Line Design for 40Gbps

▐ RZ-DPSK / RZ-DQPSK

  • Comparable with dispersion map for 10Gbps DPSK

▐ DP-RZ-QPSK

  • All SMF without in-line DCF is one of the ideal transmission lines for

digital coherent system, if only considering system performance.

  • DMF is considered to be still one of the practical candidate for

transmission line of digital coherent system with following issues,

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0.2 0.4 0.6 0.8 1 Block Averaged Dispersion [ps/nm/km] Q value [dB] RZ-DPSK RZ-DQPSK 8 9 10 11 12 13 14

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1 2 3 4 5 Block Averaged Dispersion [ps/nm/km] Q value [dB] All SMF

40G DP-RZ-QPSK DMF (SpanD=-2 ps/nm/km) All SMF

transmission line of digital coherent system with following issues,

■ CD compensation capability with DSP: around +/-40,000 ps/nm ■ Co-existing transmission with 10Gbps and/or analog 40Gbps signals

40G RZ-DPSK, RZ-DQPSK RZ-DPSK RZ-DQPSK

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SLIDE 8 enabling the next generation of networks & services

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40Gbps Transmission Performance Assessment

  • Straight line experiment

– First generation 40Gbps transponder (RZ-DPSK and RZ-DQPSK) – 4300 km DMF transmission line (span length: 43 km) – 4300 km DMF transmission line (span length: 43 km) – 6500 km DMF transmission line (span length: 70 km) – 3400 km NZDSF Transmission line (span length: 46 km)

  • Loop experiment

– Second generation 40Gbps transponder (DP-RZ-QPSK) – DMF transmission line (span length: 73km)

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SLIDE 9 enabling the next generation of networks & services

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40Gbps Transponder (First Generation)

Main features

  • Various interfaces

STM-256/OC-768, STM-64/OC-192, 10GbE LAN PHY

  • RZ-DPSK / RZ-DQPSK modulation formats
  • Enhanced FEC codes
  • Cover ITU-T grid with 100GHz/50GHz grid

40G Transponder Type SLTM40 SLTM40-Q SLTM40-XG Tributary Interface STM-256/OC-768 STM-64/OC-192 10GbE Line Bit Rate 43.02Gbps 44.57Gbps Modulation format RZ-DPSK, RZ-DQPSK FEC coding gain (BER=1x10-13) 8.2dB

  • Cover ITU-T grid with 100GHz/50GHz grid
  • Tunable Dispersion Compensation Module (TDCM)
  • 4x40G SLTMs in one SLT shelf
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SLIDE 10 enabling the next generation of networks & services

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40km span 50km span 60km span 70km span 80km span 90km span 100km span 70km span (Exp.) 40km span 50km span 60km span 70km span 80km span 90km span 100km span 70km span(Exp.)

RZ-DPSK/RZ-DQPSK 6,500 km DMF Straight Line Transmission

50GHz spaced 40Gbps RZ-DQPSK 100GHz spaced 40Gbps RZ-DPSK

  • DMF line designed for commercial 10G Trans

DMF line designed for commercial 10G Trans-Pacific systems Pacific systems

(70 km span) (70 km span)

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1 2 3 4 5 6 Repeater Output Power [dBm/ch] Q factor [dB] 7 8 9 10 11 12 13 14
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1 2 3 4 5 6 Repeater Output Power [dBm/ch] Q factor [dB]

Optimum Channel Power:-2dBm Q value: 11.1dB Optimum Channel Power:-3dBm Q value: 10.5dB

FEC Detection Limit FEC Detection Limit 40km span 100km span 40km span QSNR at -2dBm/ch QSNR at -3dBm/ch

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SLIDE 11 enabling the next generation of networks & services

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Experimental Setup for 40Gbps DP-RZ-QPSK Signal Transmission

LD1 LD7 LD5 LD3 PM CPL RZ mod QPSK mod QPSK mod PBC

10G(1) 10G(2) 10G(3) 10G(4)

er 40G DP-RZ-QPSK TX1 PD PD Pol. Diversity Coherent RX ADC LD1 LD7 LD5 LD3 PM CPL RZ mod QPSK mod QPSK mod PBC

10G(1) 10G(2) 10G(3) 10G(4)

er 40G DP-RZ-QPSK TX1 PD PD Pol. Diversity Coherent RX ADC

40G Digital Coherent Test-bed

84 CW Light Source LD7 LD2 LD8 LD6 LD4 PM CPL RZ mod QPSK mod QPSK mod PBC

10G(1) 10G(2) 10G(3) 10G(4)

Interleaver SW1 40G DP-RZ-QPSK TX2 DMF 73km DMF 73km DMF 73km DMF 73km DMF 73km DEC GEQ SW2 DMF 73km DMUX PD PD PD Diversity 90 degree Hybrid DSP (PC) ADC Local LD 84 CW Light Source LD7 LD2 LD8 LD6 LD4 PM CPL RZ mod QPSK mod QPSK mod PBC

10G(1) 10G(2) 10G(3) 10G(4)

Interleaver SW1 40G DP-RZ-QPSK TX2 DMF 73km DMF 73km DMF 73km DMF 73km DMF 73km DEC GEQ SW2 DMF 73km DMUX PD PD PD Diversity 90 degree Hybrid DSP (PC) ADC Local LD

Optimized Dispersion Map

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SLIDE 12 enabling the next generation of networks & services

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9 10 11 12 ctor [dB]

40Gbps DP-RZ-QPSK Signal Performance

  • n DMF Transmission Line

50GHz spaced 40Gbps DP-RZ-QPSK signal All-SMF (60km span, Ref.)

QMeas QSNR

6 7 8 9 4000 5000 6000 7000 8000 Distance [km] Q facto

X pol. Y pol.

6300km

X pol. Y pol.

Constellation Map

FEC Detection Limit

4370km

(60km span, Ref.) DMF(73km Span)

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SLIDE 13 enabling the next generation of networks & services

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40Gbps DWDM Development Direction

Suppression of nonlinear propagation impairment will be the most vital for 40Gbps DWDM systems over trans-Pacific distances.

Capacity/fp

7.68Tbps

DP-RZ-QPSK (Digital) 25GHz spacing

Low Loss / Low NL SMF Low Loss / Low NL SMF Raman Amp. / Remote Amp. Raman Amp. / Remote Amp.

Transmission Distance (km)

3000km 6000km 9000km 1.28Tbps 2.56Tbps 3.84Tbps 5.12Tbps RZ-DQPSK 50GHz spacing LEAF/DMF RZ-DPSK (Analog) 100GHz spacing LEAF/DMF EDFA (40nm)

25GHz spacing DMF

(Reference) 10G-25GHz 1.92Tbps

12,000km

Raman Amp. / Remote Amp. Raman Amp. / Remote Amp. Next Gen. FEC (e.g. LDPC) Next Gen. FEC (e.g. LDPC)

Nonlinear tolerant modulation (e.g. DP-RZ-BPSK) 50GHz spacing New DMF (Low Loss, Low NL)

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SLIDE 14 enabling the next generation of networks & services

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Conclusion

  • 40G system design toward trans-pacific transmission is

discussed in terms of modulation format and relevant transmission line.

  • Trans-Oceanic transmission is shown to be feasible up to
  • Trans-Oceanic transmission is shown to be feasible up to
  • approx. 6,500 km distance by adopting the commercial 40G

RZ-DPSK / RZ-DQPSK transponders and second generation DP-RZ-QPSK transponders.

  • 40G DWDM development direction for ultra long-haul and ultra

capacity system is discussed.

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SLIDE 15

2010

enabling the next generation of networks & services

conference & convention

Pacifico Convention Plaza Yokohama & InterContinental The Grand Yokohama 11 ~ 14 May 2010 www.suboptic.org The 7th International Conference & Convention

  • n Undersea Telecommunications