TECHNOLOGICAL CHALLENGES FOR FIELD DEPLOYMENT AND UPGRADE OF - - PowerPoint PPT Presentation

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TECHNOLOGICAL CHALLENGES FOR FIELD DEPLOYMENT AND UPGRADE OF MULTI-TERABIT/S UPGRADE OF MULTI-TERABIT/S SUBMARINE SYSTEMS

Gabriel Charlet

Alcatel-Lucent Bell Labs

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Presenter Profile

Gabriel CHARLET was born in Rueil Malmaison (France) in 1976. He joined Alcatel Research and Innovation in

• 2000. Since then he has been working
• n WDM transmission systems and

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• n WDM transmission systems and

realized several multi-terabit/s transmission records presented in conferences.

Gabriel Charlet Email: gabriel.charlet@alcatel- lucent.com Tel: (+33) 1 7033 2708

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From 10Gb/s channel rate to 40Gb/s (and then 100Gb/s)

State of the art 10Gb/s systems can transport ~1.6Tb/s

per fiber (10Gb/s DPSK, 25GHz channel spacing) Submarine requirements for 40Gb/s and 100Gb/s : Long distance (>6000km) with sufficient system Q margins

Excellent OSNR sensitivity Large tolerance to linear distorsions (dispersion, PMD…) Superior non linear tolerance Compact optical spectrum for high capacity system

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Evolution of information spectral density over the last 15 years

Commercial system

• perates at 10Gb/s for 10

years ! Shift to 40Gb/s to

• Shift to 40Gb/s to

increase capacity has not yet appeared commercially due to suboptimum 40Gb/s proposals until very recently

• !
• "

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Alcatel-Lucent 40Gb/s solution

Association of :

Binary PSK to keep superior non linear tolerance Polarization division multiplexing (PDM) to double system capacity coherent detection to improve noise sensitivity digital signal processing to compensate for linear impairment and for efficient polarization demultiplexing

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40Gb/s Transponder description

#$%& ' #$%& (

Transmitter

)*" )*"

• °
• )*"

)*"

• °

° # $#%

• *

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• #$%&

Coherent receiver

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Upgrade of 10Gb/s systems to 40Gb/s

• Large number of deployed systems are

based on NZDSF and have been deployed with 10G OOK channels

• 40Gb/s should be compatible with such
• 40Gb/s should be compatible with such

systems, with 10G channels running and provide similar performance

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Upgrade of 10Gb/s systems to 40Gb/s

7254km long NZDSF

• Similar performance obtained with 10Gb/s and

40Gb/s.

• Excellent cohabitation of 10G and 40G channels

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40Gb/s over +D/-D systems

• Modern, high capacity and long distance

systems are mainly based on the association of +D/-D fiber.

9225km +D/-D line 9225km +D/-D line

• 40Gb/s Transpacific systems are feasible !

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40Gb/s over +D only cable

• Using +D only cable is a good way to reduce span

loss (or increase span length at constant span loss)

• Coherent detection offers the capability to

compensate chromatic dispersion. compensate chromatic dispersion.

• But a 10,000km cable based on fiber with

20ps/nm/km dispersion has a huge total cumulated dispersion of 200,000ps/nm

• Such value is really challenging to compensate by

“true” real time transponder today but could be feasible soon.

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System performance over +D only cable

• Transpacific distances can be reached by using

80km long span.

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100Gb/s transmission

• Highest capacity
• btained at 100Gb/s

even if propagation over submarine distance with

15.5Tb/s over 7200km

submarine distance with large Q margin (>3dB) is still challenging.

• Up to 15.5Tb/s over

7200km has been demonstrated.

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Conclusion

• 40Gb/s is now mature for submarine

implementation to offer a fiber increased capacity. capacity.

• For new systems as well as for upgrade.
• 100Gb/s will be ready soon to offer even more

capacity, first on regional systems, then on transoceanic links.

2010

enabling the next generation of networks & services

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

• n Undersea Telecommunications

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Single channel vs dual channel

3.5dB

• Single channel PDM BPSK is superior to dual channel,

especially in center region of NZDSF links.