Tatsuhiro Nakada Yoshiro Sato, Yasushi Hara, Shigehisa Sugiyama, - PowerPoint PPT Presentation

conference & convention enabling the next generation of networks & services FULLY FLEXIBLE AND AUTOMATED SUBMARINE LINE TERMINATING EQUIPMENT FOR ADVANCED DWDM SYSTEMS FOR ADVANCED DWDM SYSTEMS Tatsuhiro Nakada Yoshiro Sato, Yasushi Hara, Shigehisa Sugiyama, Takaaki Ogata and Yasuhiro Aoki NEC Corporation

conference & convention enabling the next generation of networks & services OUTLINE � Introduction � Submarine Line Terminal Equipment for Advanced DWDM � Submarine Line Terminal Equipment for Advanced DWDM System � Main features Key functions � Future technologies � � Conclusion

conference & convention enabling the next generation of networks & services Market background: Evolution of Global IP Network Internet Traffic Growth � Traffic movement to larger multimedia embedded content and streaming video � Shift to larger bandwidth FTTH by content providers and other high- end customers with 10 to 15 % traffic growth per every year � Communication industry to support growth by reducing costs IP over SDH/WDM/Submarine IP over SDH/WDM/Submarine � Rapidly expanding Data Centers worldwide for growing IP Traffic and Cloud Computing � Transition to Ethernet-based access (GE, 10GE, and beyond) � Separation of private and public domains for secured network � Submarine to accommodate scalable, high-capacity IP network with a secured manner

conference & convention enabling the next generation of networks & services Important features of Submarine Cable System to meet the Global IP Network demand � Extremely large capacity over 10 Tb/s per cable � Long haul transmission over trans-pacific distance � Accommodation of Ethernet traffic � Secured traffic signal with high system availability � Flexible logical network design capability � Small latency for TCP/IP � Easy and Efficient operation and maintenance To provide all these features, highly flexible and automated submarine line terminating equipment has been developed.

conference & convention enabling the next generation of networks & services Main Features of Submarine Line Terminal Equipment (T740SW) – Modular architecture for flexible capacity upgrade – High transmission performance for extremely large capacity and ultra long-haul distance – Automatic optimization function for easy and precise adjustment – Various and flexible tributary interfaces including the Ethernet interface – Wavelength Protection for high system availability – OADM system support for flexible logical network – OADM system support for flexible logical network design – Efficient spare for easy O&M – Compact size for small foot print

conference & convention enabling the next generation of networks & services Modular Architecture for Flexible Upgrade (1) Basic Configuration Gain Bandwidth Sub Block Multiplexer(25G Spacing) Lambda Initial Initial Lambda Upgrade additional additional Lambda Upgrade to 40G Additional Sub Block Multiplexer for 40G additional (50G Spacing) additional Lambda 40G Signal 40G Signal

conference & convention enabling the next generation of networks & services Modular Architecture for Flexible Upgrade (2) Rambda 25GHz Grid 33GHz Grid 50GHz Grid STM64 Transponder STM64 Transponder STM64 Transponder STM64 Transponder STM64 Transponder STM64 Transponder Transponder STM16 x 4 Transponder STM16 x 4 STM64 Transponder STM64 Transponder STM64 Transponder STM64 Transponder Transponder 10G LAN-PHY 10G LAN-PHY Transponder STM64 Transponder STM64 Transponder Transponder STM64 x 4 Transponder STM64 x 4 STM256 Transponder STM256 Transponder Transponder 10G LAN-PHY x 4 Transponder Transponder STM256 STM256 Transponder

conference & convention enabling the next generation of networks & services Hyper FEC for High transmission performance - 13 : 10dB ▐ FEC coding gain at BER=10 1.0E+00 1.0E+00 1.0E-01 1.0E-01 1.0E-02 1.0E-02 T BER T BER w/o FEC w/o FEC w/o FEC w/o FEC w/o FEC w/o FEC w/o FEC w/o FEC 1.0E-03 1.0E-03 OUTPUT B OUTPUT B 1.0E-04 1.0E-04 1.0E-04 1.0E-04 1.0E-05 1.0E-05 1.0E-06 1.0E-06 RS(255,239) RS(255,239) RS(255,239) RS(255,239) RS(255,239) RS(255,239) RS(255,239) RS(255,239) 1.0E-07 1.0E-07 Ex Ex Ex Ex Ex Ex Ex Ex 1.0E-08 1.0E-08 Hyper FEC Hyper FEC A-FEC A-FEC A-FEC A-FEC A-FEC A-FEC A-FEC A-FEC 1.0E-09 1.0E-09 1.0E-10 1.0E-10 A-FEC A-FEC A-FEC A-FEC A-FEC A-FEC A-FEC A-FEC 1.0E-11 1.0E-11 1.0E-12 1.0E-12 1.0E-05 1.0E-05 1.0E-04 1.0E-04 1.0E-03 1.0E-03 1.0E-02 1.0E-02 1.0E-01 1.0E-01 INPUT BER INPUT BER

conference & convention enabling the next generation of networks & services RZ-DPSK for High transmission performance RZ-DPSK Transmitter RZ-DPSK Receiver 10Gb/s-Data 10GHz Pre-coder Clock Data DFB DPSK Balanced Clock/ Data DPSK-mod RZ-mod LD Demodulator Receiver Recovery Clock OSNR tolerance OSNR tolerance OSNR tolerance Dispersion tolerance 18 18 18 5 17 17 17 17 17 17 16 16 16 4 Q degradation (dB) 15 15 15 Q value [dB] Q value [dB] Q value [dB] 14 14 14 3 RZ-DPSK RZ-DPSK RZ-DPSK RZ RZ RZ 13 13 13 2.5dB improvement 2.5dB improvement 2.5dB improvement 2 12 12 12 RZ 11 11 11 1 10 10 10 RZ-DPSK 9 9 9 0 8 8 8 -800 -600 -400 -200 0 200 400 600 800 2 2 2 3 3 3 4 4 4 5 5 5 6 6 6 7 7 7 8 8 8 9 9 9 10 10 10 11 11 11 12 12 12 13 13 13 14 14 14 15 15 15 Dispersion (ps/nm) OSNR [dB] OSNR [dB] OSNR [dB] � OSNR tolerance Improvement of approx. 2.5dB � High quality transmission against dispersion-related non-linear degradation � High tolerance for Stimulated Brillouin Scattering

conference & convention enabling the next generation of networks & services Future 40G DP-QPSK for High capacity transmission performance Demodulated signal DP-RZ-QPSK signal after digital signal process ＝ + 10G 10G Data2 Data1 Client Interface Client Interface 90 degree QPSK mod SerDes SerDes Hybrid FEC FEC ADC DSP LD RZ Carver PBC PBS 90 degree QPSK mod Hybrid Local 10G CLK LD 10G 10G Data4 Data3 Receiver Transmitter T740SW platform can support the future 40G technologies

conference & convention enabling the next generation of networks & services Tunable Dispersion Compensation for Automatic adjustment function � Excellent transmission performance thanks to the precise and automatic dispersion tuning capability � Latency reduction by eliminating individual DCFs and associated amplifiers � Non-interruptive adjustment of dispersion amount through EMS during the O&M activity Common Part Common Part Individual Part Individual Part DCF DCF Transponder AMP AMP with TDCM with TDCM Transponder Transponder DEMUX Transponder DEMUX with TDCM WDM Transponder WDM Transponder signals with TDCM signals Transponder Transponder with TDCM Transponder Conventional DCF method TDCM method 1.0E-01 1.0E-02 1.0E-03 TDCM dispersion is optimized automatically Bit Error Rate 1.0E-04 after scanning the tuning range. 1.0E-05 1.0E-06 1.0E-07 1.0E-08 1.0E-09 -1000 -800 -600 -400 -200 0 200 400 600 800 TDCM Dispersion value (ps/nm)

conference & convention enabling the next generation of networks & services Pre-emphasis control for Automatic adjustment function — Optical channel power at transmitter is adjusted automatically so that the optimum transmission performance is obtained. Tx Signal Tx Signal Rx Signal Rx Signal Rx Signal Rx Signal Pre Pre-Emphasis Control Emphasis Control 1. Measure Q value of each wavelength at Rx side. 2. Feed-back measured Q value to Tx Side 3. Control optical launch power of each wavelength Tx Signal Tx Signal Rx Signal Rx Signal

conference & convention enabling the next generation of networks & services Wavelength protection for High system availlability SLTE SLTE SLTE SLTE Transponder Transponder Transponder Transponder W R R W (Work) (Work) (Work) (Work) C C C C C C M M S S Transponder Transponder Transponder Transponder Transponder Transponder Transponder Transponder S M T T (Work) (Work) (Work) (Work) Submarine Cable E E E E B B B Transponder Transponder Transponder Transponder (Protection) (Protection) (Protection) (Protection)

conference & convention enabling the next generation of networks & services Meshed Submarine Network with OADM Scheme Logical Configuration Physical Configuration T-3 T-5 OADM-BU Mesh T-1 T-6 B-3 B-1 T-1 T-1 T-6 T-6 T-2 T-2 T-5 T-5 B-2 B-2 B-4 B-4 T-2 T-4 T-3 T-4 OADM-BU

conference & convention enabling the next generation of networks & services Dry plant OADM application O TPND TPND W W D M M TPND TPND F E E TPND TPND ― Terminal Application : Transponder Back-to-Back Solution � All wavelengths are terminated at Transponders. � All wavelengths are terminated at Transponders. Optical Amplifier W W M M Optical Amplifier E E O D TPND TPND F ― Fixed OADM Application :Optical Pass-Through � WME is connected directly through optical amplifier without Transponder.