ATLAS:All-optical Terabit per second LAmbda Shifted transmission

• Main Objective: Nx40 and Nx80 Gbit/s transmission

in networks encompassingall-optical wavelength converters

•WDM RZ transmission over terrestrial G.652 or G.655 links, tolerant to intermediate wavelength conversion with dispersion management and 100 km amplification spans

•Experimental test of 4x40 Gbit/s and 2x80 Gbit/s with one in-line wavelength converter

• Field test of 4x40 Gbit/s with one in-line wavelength converter

•Fabrication of new electronics and optoelectronics devices: 40 Gbit/s receivers, 40 Gbit/s EMUX, DEMUX, PMD compensator

•Theoretical study on Tbit/s transport networks

Technical ApproachTechnical Approach

University College London (UK)

ATLAS Consortium Composition: ATLAS Consortium Composition: The Round TableThe Round Table

Fondazione Ugo Bordoni (I)

Pirelli LABS (I)

Opto Speed Opto Speed Italia (I)

Thales (F)

University of Paderborn (D)

University of Ljubljana (SLO)

United Monolithic

Semiconductors (F)

Instituto de Telecomunicações (P)

ISCTI (I)

Consorzio Padova Ricerche (I)

INTO THE LINE 1: Dispersion ManagementINTO THE LINE 1: Dispersion Management

Devices Devices Dispersion compensating fibreGratings

Compensation SchemesCompensation Schemes

DCU

DCU

DCU

x5

x5

x5

100km

100km

100km

Pre-chirp

Pre-compensation

Post-compensation

Post-compensation+

Pre-chirp

All at the end compensation

a)post compensationa)post compensationb)post compensation+prechirpb)post compensation+prechirpc)all at the endc)all at the end

INTO THE LINE 2:INTO THE LINE 2:Different DM Schemes Different DM Schemes -- SimulationsSimulations

1,E-13

1,E-12

1,E-11

1,E-10

1,E-09

1,E-08

1,E-07

1,E-06

1,E-05

1,E-04

1,E-03

-22 -21 -20 -19 -18 -17 -16 -15 -14Received Power [dBm]

BER

Back to BackCompensation scheme (a)Compensation scheme (b)Compensation scheme (c)

BER measurement vs. received power after 5x100 km G.652 fiber. OSNR is 17 dB (2 nm res bw) for all cases

INTO THE LINE 3:INTO THE LINE 3:Different DM Schemes Different DM Schemes -- Experiments with DCFExperiments with DCF

a)post compensationa)post compensationb)post compensation+prechirpb)post compensation+prechirpc)all at the endc)all at the end

INTO THE LINE 4: Raman AmplificationINTO THE LINE 4: Raman Amplification•Amplification provided at any frequency•No special fibre required (any deployed cable can be upgraded)

•Distributed amplification (span noise figure improvement)

DCU

x5100km

300 mW1450 nm

Signal

RamanPump

-15

-10

-5

0

5

10

15

0 1 2 3 4 5N Span

Pow

er (d

Bm

)

G.652G.655

FUBFUB--ISTCIISTCI

PomeziaPomezia

RomaRoma

30 SMR30 SMR30 DS30 DS20 NZD20 NZD

Cable CompositionCable Composition

THE LINETHE LINE

44÷÷1 1 MUXMUX

PM PM CC

40 40 GbGb/s /s Data EncoderData Encoder

10 10 GbGb/s DT/s DT

20 GHz 20 GHz ckck

λλ ii

λλ ii1550.92 nm1550.92 nm

1552.52 nm1552.52 nm

1554.13 nm1554.13 nm

1555.75 nm1555.75 nm

4x10 4x10 GbGb/s /s PRBS PRBS

generatorgenerator

10 GHz 10 GHz ckck

20 GHz ck 20 GHz ck synthesizersynthesizer

5 5 psps @ 40 GHz@ 40 GHz 10 10 GbGb/s /s PPGPPG

40 GHz Pulse 40 GHz Pulse ShaperShaper

PM EDFAPM EDFA

EDFAEDFA40 40 GbGb/s PRBS/s PRBS

TX SIDE:TX SIDE:44--Channel 40 Channel 40 GbitGbit/s ETDM/s ETDM

40 GHz ck 40 GHz ck

400 mV pp 400 mV pp

40 40 GbGb/s incoming /s incoming signalsignal

10 10 GbGb/s /s demuxed demuxed tributary tributary

Line OSNRLine OSNR

1.1 nm1.1 nm 1.3 nm1.3 nm 1.3 nm 1.3 nm

40 40 GbGb/s/sck recoveryck recovery

10 10 GbGb/s /s EDED

50 GHz 50 GHz High Power High Power

PIN PIN

40 40 GbGb/s /s 11÷÷4 4

DEMUXDEMUX

TGFTGF BPFBPF BPFBPF

EDFAEDFAEDFAEDFAEDFAEDFA

RX SIDE:RX SIDE:44--Channel 40 Channel 40 GbitGbit/s ETDM/s ETDM

DCUDCU

DCUDCU

DCUDCU

DCUDCU

AOWCAOWCInterconnectionInterconnection

Rack

Rack

(Rom

e)(R

ome)

InterconnectionInterconnection

Rack

Rack

(Pomezia

(Pomezia

DCUDCU

EDFAEDFA

RamanRamanPumpPump

40 Gbit/s40 Gbit/sTXTX

40 Gbit/s40 Gbit/sRXRX

SetSet--UpUp

23.5 km fiber span23.5 km fiber span94 km amplifier spacing94 km amplifier spacing

TMTM

TETE TMTM

PPLN-wavelength converter

TETE

TM

TMTMTETE

PMFPMF

PBSPBSCirculatorCirculator

λλSS

λλFF

λλCC

4x40 4x40 GbGb /s /s From the lineFrom the line

90/1090/10

BPF BPF (1.3 nm)(1.3 nm)

EDFAEDFA(30 dBm)(30 dBm)

EDFAEDFA(28 dBm)(28 dBm)

BPF BPF (1.3 nm)(1.3 nm)

TunableTunableLaserLaser

AOWC AOWC polarization insensitive schemepolarization insensitive scheme

λidler

90/1090/10

0.2 dB polarisation sensitivity0.2 dB polarisation sensitivity

PolPolScrambScramb

ωp=2ωf ωsωf

ωi=2 -ω ωf s

ω

SHG DFGCascading (χ(2))

G.655 DSPAN (ps/nm) SSPAN (ps/nm2) αSPAN (dB) DGD (ps) GR (dB)

NZD 240.33 6.12 23.9 0.6 12

DCF1 -239.43 -1.17 2.8 0.2

Residual 0.9 (99.6%) 4.95 (19.1%)

G.652 DSPAN (ps/nm) SSPAN (ps/nm2) αSPAN (dB) DGD (ps) GR (dB)

SMR 1542.76 5.38 22.2 0.3 8

DCF2 -1543.76 -3.99 12.4 0.5

Residual -1 (100.1%) 1.39 (74.2%)

G.652 D (ps/nm/km) S (ps/nm2/km) α (dB/km) PMD (ps/km1/2)

SMR 16.34 0.06 0.22 0.03

DCF2 -108 -0.20 0.64 0.13

G.655 D (ps/nm/km) S (ps/nm2/km) α (dB/km) PMD (ps/km1/2)

NZD 2.54 0.06 0.24 0.06

DCF1 -95 -0.46 0.92 0.10

λ = 1552.52 nm

DGD (EDFA) < 0.5 ps

PR=400 mW @ 1455 nm

Link Main Characteristics

Polarization insensitive in linePolarization insensitive in line--conversion:conversion:

eye

eye --

diag

ram

s at

Rx:

diag

ram

s at

Rx:

after 500 km (ch 3):after 500 km (ch 3):

300 km+(ch 3 ch 7)+200 km:300 km+(ch 3 ch 7)+200 km:(polarization scrambled)(polarization scrambled)

pol. dependence during scrambling: < 1 dBpol. dependence during scrambling: < 1 dB

input input channelschannels

after demuxafter demux+ conversion+ conversion+ mux+ mux

1 2 3 4 5 6 1 2 3 4 5 6 77

eye

eye --

diag

ram

s at

Rx:

diag

ram

s at

Rx:

HYBRID Erbium + Raman amplification

Power Map

-15

-10

-5

0

5

10

15

0 1 2 3 4 5N Span

Powe

r (d

Bm)

G.652G.655

Dispersion Map: G.655 fibre

-50

0

50

100

150

200

250

300

350

0 100 200 300 400 500Distance (km)

Dispe

rsion

(ps/

nm)

D(ch1); res= -44.1ps/nm

D(ch2); res= -4.5 ps/nm

D(ch3); res= 35.1 ps/nm

D(ch4); res= 75 ps/nm

D(ch3->ch7); res= 58.3ps/nm

1552.52 nm1550.92 nm 1554.13 nm 1555.73 nm

Eye Diagrams after 5 x 100 kmDM with prechirp; 14 dBm/span; 5 dBm/DCU

Residual Dispersion Slope: G.655 fibre

Eye diagrams after per channel

postcompensation

+32 ps/nm -46 ps/nm -92 ps/nm

-100

100

300

500

700

900

1100

1300

1500

1700

0 100 200 300 400 500

Distance (km)

Dispe

rsion

(ps/

nm)

D(ch1) D(ch2) D(ch3) D(ch4) D(ch3->ch7)

Dispersion Map: G.652 fibre

1552.52 nm1550.92 nm 1554.13 nm 1555.73 nm

Eye Diagrams after 5x100 kmDM with prechirp; 13 dBm/span; 5 dBm/DCU

Eye diagrams after per channel postcompensation

+18 ps/nm -22 ps/nm

Residual Dispersion Slope: G.652 fibre

4 channels, 200 GHz spacing, 5 ps FWHM

Without inline AOWC With inline AOWC

Optical Spectrum after 5 x 100 km

BER performance vs OSNR: G.655 fibre

1.E-13

1.E-12

1.E-11

1.E-10

1.E-09

1.E-08

1.E-07

1.E-06

1.E-05

1.E-04

1.E-03

2 3 4 5 6 7 8 9 10 11 12 13 14 15OSNR @ 2 nm res bw (dB)

BER

BTBCh 1Ch 2Ch 3Ch 4300 km + conv + 200 km

5 x 100 km; 10 dBm/span; -2 dBm/DCU; 27-1 PRBS< 1 dB OSNR penalty for all channels

BER performance vs OSNR: G.652 fibre

1.E-13

1.E-12

1.E-11

1.E-10

1.E-09

1.E-08

1.E-07

1.E-06

1.E-05

1.E-04

1.E-03

2 3 4 5 6 7 8 9 10 11 12 13 14 15OSNR @ 2 nm res bw (dB)

BER

BTBCh 1Ch 2Ch 3Ch 4300 km + conv + 200 km

5 x 100 km; 12 dBm/span; -2 dBm/DCU; 27-1 PRBS< 1 dB OSNR penalty for all channels

BER performance vs OSNR: 8 channels

1.E-13

1.E-12

1.E-11

1.E-10

1.E-09

1.E-08

1.E-07

1.E-06

1.E-05

1.E-04

1.E-03

2 3 4 5 6 7 8 9 10 11 12 13 14 15OSNR @ 2 nm res bw (dB)

BER

BTB

G.652: 5x100 km; 15 dBm

G.655: 3x100 km; 10 dBm

27-1 PRBS; 10 ps FWHM; ch 5 BER performance< 1 dB OSNR penalty with 5 x 100 km (G.652) and 3 x 100 km (G.655)

BER performance vs OSNR: PRBS length231-1 PRBS: 3 dB penalty with respect to 27 in back to back

no additional penalty with 5 x 100 km G.655 fibre10-9 BER floor with 5 x 100 km G.652 fibre

1.E-13

1.E-12

1.E-11

1.E-10

1.E-09

1.E-08

1.E-07

1.E-06

1.E-05

1.E-04

1.E-03

5 6 7 8 9 10 11 12 13 14 15 16 17 18

OSNR @ 2 nm res bw (dB)

BER

BTB; 2^31

BTB; 2^7

5 x 100 km G.655; 2^31

5 x 100 km G.655; 2^7

• 3 different 40 Gbit/s receivers (InP, GaAs)• 40 and 80 Gbit/s clock recovery• 10 to 40 Gbit/s EMUX, 40 to 10 Gbit/s DMUX• 40 Gbit/s XOR, FF D• 40 Gbit/s amplifiers, filters• Polarisation mode dispersion compensator• Polarisation mode dispersion measurement

instruments• Wavelength conversion with:

– PPLN, 500 km after conversion– SOA polarisation independent scheme, 300 km after

conversion– MQW and FWM in DS fibres

Fabricated devices