100G w sieciach szkieletowych i miejskich.pdf

100G w sieciach szkieletowych i miejskich

100G for Long Haul and metro networks

The Ekinops 360 Multi-Reach Optical Transport Platform

Norbert Gulczynski, Senior Sales Engineer

ngulczynski@ekinops.net

Key challenges for LH

 Key challenges to transport 100Gb/s

 Those systems should be deployable over existing 10Gb/s

systems using 10G link engineering design rules

 Typical 10G link engineering rules are:

 Chromatic Dispersion (CD) tolerance of 800 ps/nm

 Polarization Mode Dispersion (PMD) Tolerance of 10ps (Mean

DGD)

 Optical reach up to 2000km

 Operation at 50GHz channel spacing

 Transit through multiple cascaded ROADM

Page 2

Design tradeoffs

 OSNR performance Coherent versus Direct detection

 Binary PSK : only 0,7dB in favor of coherent detection

 Quaternary PSK offer 2,5dB more with coherent detection

 Allows OSNR increased to go more than 1500kms

 Allows 50GHz spacing

 Advantage of coherent detection

 Phase information passes into the electrical domain at receive

side

 Analog/digital filters can be used for PMD and CD compensation

 A single channel can be filtered from many DWDM channels by tuning the

local oscillator (tunable laser at received side)

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Pratical Networking Challenges - LH

 Design criteria that must be meet:

 Optical reach > 2000km

done

 Support 50GHz DWDM channel spacing

done

 No change to existing DWDM equipment

done

 Non traffic affecting upgrades on existing 2,5/10/40Gb/s

done

 Must not induce crosstalk penalty on existing DWDM channels

limitation

 Power per channel must be ~+2dBm

done

 Chromatic Dispersion tolerance of +/- 800ps/nm

50000ps/nm

 Polarisation Mode Dispersion tolerance of 10ps (mean DGD)

30ps

 Ability to express channel through >= 5 cascaded ROADMs@50GHz spacing

done

 Ability to express channel through >=25 cascaded ROADMs @100GHz spacing done

 Automated dispersion tuning done

 Full band Lasers on 50GHz grid done

 Must be bit to bit transparent for the 100GbE client interface, no flow control or packet loss at

transport layer done

 Must be “plug and play” and installable by existing technicians “no PhD with screwdrivers”

required for installation

done

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OSNR Performance

 100G already at the second generation

 1st Generation

 PM QPSK, DP BPSK, …

 OSNR 16/17dB

 2 nd Generation

 DP QPSK

 OSNR 14dB

 3rd Generation

 DynaFEC

 OSNR 12dB

Page 5

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