2014 11 14-15_t-unrepeatered-transmission-over-409-6-km-acp-2014-af4b-4-post-deadline-paper-presentation-xtera

© 2014 Xtera Communications, Inc. Proprietary & Confidential

Maximizing Network Capacity, Reach and Value Over land, under sea, worldwide

1

Post-Deadline Paper

15 Tbit/s Unrepeatered Transmission over 409.6 km using Distributed Raman Amplification and ROPA

Do-il Chang, Wayne Pelouch, Philippe Perrier, Herve Fevrier

Xtera Communications, Inc.

Sergey Ten, Christopher Towery, Sergejs Makovejs

Corning, Inc.

14 November 2014

Asia Communications and Photonics (ACP) Conference 2014 (Shanghai, China) – ATh4E.4

© 2014 Xtera Communications, Inc. Proprietary & Confidential 2

• Introduction – Recent unrepeatered transmission results

• Experimental setup – Distributed Raman pump module

– Fiber characteristics of Corning® Vascade® EX2000

– System configuration

• 15 Tbit/s unrepeatered transmission results

• Transmission with channel growth

• Summary / Conclusion

Content


Recent Unrepeatered Transmission Results

Reference Total

Capacity (Tb)

No CHs x Bit rate (ch spacing)

Signal Format Coherent Processing

Span Info Capacity x Reach

(Pb/s Km) Fiber Type ROPA Length (Km)

Loss (dB)

ALU, ECOC 2009 2.6 26x112 Gb/s

(50GHz) PDM-QPSK Offline E-PSCF (115mm2) YES 401 67 1.04

Corning, ECOC 2010 4.0 40x112 Gb/s

(50GHz) PM-QPSK Offline

EX1000, 2000, Dev (76mm2, 112mm2,

128mm2) No 365 59.6 1.46

Bell Labs, ALU, OFC 2011 0.8 8x112 Gb/s

(50GHz) PDM-iRZ-BPSK Offline NZDSF (LEAF) No 300 66 0.24

Xtera, ECOC 2011 0.8 8x120 Gb/s (100GHz)

PM-NRZ-QPSK Offline Z (Legacy, 76mm2) Yes 444.2 76.6 0.36

ALU, ECOC 2011 0.4 4x100 Gb/s

(50GHz) PDM-QPSK Real Time

ULA-PSCF, E-PSCF (135mm2, 115mm2)

Yes 462 76.9 0.18

Fujitsu, ECOC 2011 16 80x224 Gb/s

(50GHz) DP-16QAM

(50GHz) Offline Large Aeff PSCF (133mm2) No 240 39.1 3.84

Xtera, ECOC 2012 3.4 34x120 Gb/s (50, 100GHz)

PM-NRZ-QPSK Real Time Z (Legacy, 76mm2) Yes 432.8 74.4 1.47

ALU, ECOC 2012 6.0 60x100 Gb/s

(40GHz) PDM-RZ-QPSK Offline

ULA-PSCF, E-PSCF (135mm2, 115mm2)

Yes 437 71.0 2.62

Xtera, IPC 2012 1.2 12x120 Gb/s

(100GHz) PM-NRZ-QPSK Real Time

Z (Legacy, 76mm2)

No

383.5 66.7 0.46

SMF (Legacy, 80mm2) 342.7 66.8 0.41

Xtera, OFC 2013 0.8 8x120 Gb/s (100GHz)

PM-QPSK Real Time Z, EX2000

(76mm2, 112mm2) Yes 480.4 80.8 0.38

OFS, OFC 2013 3.2 32x120 Gb/s PDM-NRZ-QPSK Offline ULAF1, ULAF2, AW (150mm2, 125mm2,

80mm2) Yes 445 79.0 1.42

ALU, ECOC 2013 1.6 1x400 Gb/s + 12x100 Gb/s

PDM-NRZ-16QAM, PDM-RZ-QPSK

Offline ULA-PSCF, E-PSCF (135mm2, 115mm2)

Yes 401 65.5 0.64

OFS, OFC 2014 6.3 63x128 Gb/s PDM-NRZ-QPSK Offline ULAF1, ULAF2, AW (150mm2, 125mm2,

80mm2) Yes 402 ? 2.53

Xtera, Verizon, Corning OFC 2014 (PD)

0.1 1 x120 Gb/s

PM-iRZ-QPSK Real Time EX2000 (112mm2) fiber

cable in OSP Environment

Forward and

Backward

556.7 90.2 0.06

0.4 4 x120 Gb/s

(100GHz) 523.2 84.8 0.21

Corning, OpticsExpress 2014

8.0 40x256 Gb/s

(50GHz) PDM-16QAM

Offline EX3000 (152mm2)

No

286 44.5 2.29

Offline EX3000, EX2000

(152mm2, 110mm2) 292 45.5 2.34

Offline EX3000, EX2000

(152mm2, 110mm2) 304 47.4 2.43

ALU, ECOC 2014 8.0 40x200 Gb/s PDM-16QAM Real Time ? Yes 363 ? 2.90

Xtera, Corning ECOC 2014

15 150x120 Gb/s

(50GHz) PM-RZ-QPSK Real Time SMF-ULL (80mm2)

No 333.6 55.4 5.00

Yes 389.6 64.3 5.84

Xtera, Corning ECOC 2014 PD

15 150x120 Gb/s

(50GHz) PM-RZ-QPSK Real Time SMF-ULL (80mm2) Yes 409.6 68.2 6.14

0

1

2

3

4

5

6

7

2008 2009 2010 2011 2012 2013 2014 2015C

apac

ity

x R

each

(P

b/s

-K

m)

Year

OFS

AlcaLu

Corning

Fujitsu

Xtera

This work > 6 Pbit/s-km (> 400 km)

300

350

400

450

500

550

600

2008 2009 2010 2011 2012 2013 2014 2015

Dis

tan

ce (

Km

)

Year

OFS

AlcaLu

Corning

Xtera

* with coherent signal processing


• Basic features – Commercially available

– Consists of five pump wavelengths distributed in the spectral range between

1420 and 1500 nm

– Uses polarization balanced and wavelength multiplexed laser diodes

(RIN < -105 dB/HZ)

– Total pump power < 1.8 W

– Uses commercial high power connector (Diamond, E2000PS) to connect

span

Distributed Raman Pumps: Nu-Wave OptimaTM SE24

from span

ES2000PS


• Flexible operation – Can be used in forward or backward pumping scheme

– Can provide flexible gain profiles based on the application (C, L, Wide-band,

w/wo ROPA etc..)

– Can increase pump power (up to ~ 2.6W) by using power expansion module

(two pump wavelengths in 1400 to 1420 nm range)

Distributed Raman Pumps: Nu-Wave OptimaTM SE24

C-band L-band Wide-band (61 nm)

Wide-band (61 nm) with ROPA

ROPA


0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

0 5 10 15 20 25 30

Ram

an G

ain

[1/(

W-k

m)]

@

142

0nm

pum

p

Frequency Shift (THz)

SMF (G.652)

PSC (G.654)

SMF28-ULL

EX2000

0.10

0.15

0.20

0.25

0.30

0.35

0.40

1400 1500 1600

Fib

er A

tte

nu

atio

n (d

B/K

m)

Wavelength (nm)

SMF (G.652)

PSC (G.654)

SMF28-ULL

EX2000

0.84

0.86

0.88

0.90

0.92

0.94

0.96

0.98

1.00

1.02

1420 1440 1460 1480 1500 1520

Po

we

r Sca

le (r

ef.

@ 1

420

nm

)

Wavelength (nm)

SMF (G.652)

PSC (G.654)

SMF28-ULL

EX2000

-56

-55

-54

-53

-52

-51

-50

-49

-48

1310 1360 1410 1460 1510 1560 1610

Bac

ksca

tte

r Co

eff

icie

nt (

dB

/ms)

Wavelength (nm)

SMF (G.652)

PSC (G.654)

SMF28-ULL

EX2000

• Lower Raman gain Requires strong Raman pump power

• Lower backscattering coefficient Less MPI penalty, higher fiber lasing

threshold

Characteristics of Corning® Vascade® EX2000 Fiber

Average of 9 samples of EX2000 spools


• LRA: (Wide-band) Lumped (discrete) Raman Amplifier – LRA-2 provides average -670 ps/nm pre-dispersion compensation.

• 100G channels: 120 Gbit/s PM-QPSK (15% overhead, 6.4 dB Q SD-FEC threshold)

• BER is measured by 100G line card with real-time ASIC processing.

• Forward and backward distributed Raman: commercial Nu-Wave OptimaTM SE24 with HP extension

• Spans consist of Corning® Vascade® EX200 fiber (G.654B). – Effective area : 112 µm2

– Total Length : 409.6 km (68.2 dB, 0.167 dB/km)

– ROPA consists of 16 m erbium and is placed at 120.9 Km form RX

System Configuration

45 C-Band

(odd) DFBs

30 L-Band

(odd) DFBs

45 C-Band

(even) DFBs

30 L-Band

(even) DFBs

100G

Comb

100G

Comb

100 GHz PM-AWG

: PM 3 dB (50/50) coupler : 3 dB (50/50) coupler

WSS

C-100G MXP

C-100G MXP

L-100G MXP

WSS

C-100G MXP

C-100G MXP

L-100G MXP

Backward Raman

Forward Raman

EX2000 409.6 km (68.2 dB)

ROPA

120.9 km 288.7 km

LRA-1 LRA-2 LRA-3


• Input signals (LRA-2 out) – Channels are pre-emphasized to provide flat Q over spectrum at receive side.

– Average power into span: -2.8 dBm/ch

• After line (LRA-3 in), at receiver (LRA-3 out) – Negligible OSNR degradation between LRA-3 in and out

– Ripple (~ 10 dB) is flattened by WSS.

– Average OSNR: 14.2 dB

Transmission over 409.6 km Vascade® EX2000

-25

-20

-15

-10

-5

0

5

1525 1535 1545 1555 1565 1575 1585 1595

Po

wer (d

Bm

)

Wavelength (nm)

-25

-20

-15

-10

-5

0

5

1525 1535 1545 1555 1565 1575 1585 1595

Po

wer (d

Bm

)

Wavelength (nm)

-25

-20

-15

-10

-5

0

5

1525 1535 1545 1555 1565 1575 1585 1595

Po

wer (d

Bm

)

Wavelength (nm)

45 C-Band

(odd) DFBs

30 L-Band

(odd) DFBs

45 C-Band

(even) DFBs

30 L-Band

(even) DFBs

100G

Comb

100G

Comb

100-GHzPM-AWG

WSS

C-100G MXP

C-100G MXP

L-100G MXP

WSS

C-100G MXP

C-100G MXP

L-100G MXP

BackwardRaman

Forward Raman

EX2000 409.6 km (68.2dB)

ROPA

120.9 km288.7 km

LRA-1 LRA-2 LRA-3


Signal Z Profile

Pump Z Profiles

Forward Pump Power : 2230 mW* Backward Pump Power : 2450 mW

Max Signal power : +11.2 dBm/ch at 18.7 Km

Forward Raman gain Includes ~ 48 dB span loss

Back Raman gain Includes ~ 20 dB span loss

ROPA Gain

Residual Pump at ROPA : 14.2 mW


* The longest pump wavelength in forward direction is off to reduce RIN penalty

Noise Figure includes 68.2 dB span loss 41.7 dB (Effective NF < -26 dB)


• Measured / simulated OSNR and measured Q of 150 channels – Simulation shows good match with the measurement.

– Average OSNR: 14.2 dB

– Average Q: 7.0 dB (All channels are above Q FEC threshold – 6.4 dB)

• 16-hours stability test – For selected 3 channels (1533.47 nm, 1561.42 nm and 1590.41 nm)

– Error free after SD-FEC for 16 hours


1.0E-02

1.2E-02

1.4E-02

1.6E-02

1.8E-02

2.0E-02

0 2 4 6 8 10 12 14 16

BE

R

Hours

1533.47 nm 1561.42 nm 1590.41 nm FEC Threshold

6

7

8

9

10

11

12

13

14

15

1525 1535 1545 1555 1565 1575 1585 1595

OS

NR

an

d Q

(d

B)

Wavelength (nm)

Measured OSNR

Simulated OSNR

Q before FEC(dB)

SD-FEC Threshold


-25

-20

-15

-10

-5

0

5

1525 1535 1545 1555 1565 1575 1585 1595

Po

wer (d

Bm

)

Wavelength (nm)

Channel Growth: 10 Channels

45 C-Band

(odd) DFBs

30 L-Band

(odd) DFBs

45 C-Band

(even) DFBs

30 L-Band

(even) DFBs

100G

Comb

100G

Comb

100-GHz PM-AWG

WSS

C-100G MXP

C-100G MXP

L-100G MXP

WSS

C-100G MXP

C-100G MXP

L-100G MXP

Backward Raman

Forward Raman

EX2000 409.6 km (68.2dB)

ROPA

120.9 km 288.7 km

LRA-1 LRA-2 LRA-3

-25

-20

-15

-10

-5

0

5

1525 1535 1545 1555 1565 1575 1585 1595

Po

wer (d

Bm

)

Wavelength (nm)

Max Signal power : +7.8 dBm At 42.7 Km

Forward Pump Power 1990 mW

Backward Pump Power 2450 mW


-25

-20

-15

-10

-5

0

5

1525 1535 1545 1555 1565 1575 1585 1595

Po

wer (d

Bm

)

Wavelength (nm)


45 C-Band

(odd) DFBs

30 L-Band

(odd) DFBs

45 C-Band

(even) DFBs

30 L-Band

(even) DFBs

100G

Comb

100G

Comb

100-GHz PM-AWG

WSS

C-100G MXP

C-100G MXP

L-100G MXP

WSS

C-100G MXP

C-100G MXP

L-100G MXP

Backward Raman

Forward Raman

EX2000 409.6 km (68.2dB)

ROPA

120.9 km 288.7 km

LRA-1 LRA-2 LRA-3



-25

-20

-15

-10

-5

0

5

1525 1535 1545 1555 1565 1575 1585 1595

Po

wer (d

Bm

)

Wavelength (nm)



-25

-20

-15

-10

-5

0

5

1525 1535 1545 1555 1565 1575 1585 1595

Po

wer (d

Bm

)

Wavelength (nm)


45 C-Band

(odd) DFBs

30 L-Band

(odd) DFBs

45 C-Band

(even) DFBs

30 L-Band

(even) DFBs

100G

Comb

100G

Comb

100-GHz PM-AWG

WSS

C-100G MXP

C-100G MXP

L-100G MXP

WSS

C-100G MXP

C-100G MXP

L-100G MXP

Backward Raman

Forward Raman

EX2000 409.6 km (68.2dB)

ROPA

120.9 km 288.7 km

LRA-1 LRA-2 LRA-3



-25

-20

-15

-10

-5

0

5

1525 1535 1545 1555 1565 1575 1585 1595

Po

wer (d

Bm

)

Wavelength (nm)



-25

-20

-15

-10

-5

0

5

1525 1535 1545 1555 1565 1575 1585 1595

Po

wer (d

Bm

)

Wavelength (nm)


45 C-Band

(odd) DFBs

30 L-Band

(odd) DFBs

45 C-Band

(even) DFBs

30 L-Band

(even) DFBs

100G

Comb

100G

Comb

100-GHz PM-AWG

WSS

C-100G MXP

C-100G MXP

L-100G MXP

WSS

C-100G MXP

C-100G MXP

L-100G MXP

Backward Raman

Forward Raman

EX2000 409.6 km (68.2dB)

ROPA

120.9 km 288.7 km

LRA-1 LRA-2 LRA-3



-25

-20

-15

-10

-5

0

5

1525 1535 1545 1555 1565 1575 1585 1595

Po

wer (d

Bm

)

Wavelength (nm)



-25

-20

-15

-10

-5

0

5

1525 1535 1545 1555 1565 1575 1585 1595

Po

wer (d

Bm

)

Wavelength (nm)


45 C-Band

(odd) DFBs

30 L-Band

(odd) DFBs

45 C-Band

(even) DFBs

30 L-Band

(even) DFBs

100G

Comb

100G

Comb

100-GHz PM-AWG

WSS

C-100G MXP

C-100G MXP

L-100G MXP

WSS

C-100G MXP

C-100G MXP

L-100G MXP

Backward Raman

Forward Raman

EX2000 409.6 km (68.2dB)

ROPA

120.9 km 288.7 km

LRA-1 LRA-2 LRA-3

Max Signal power : +11.2 dBm at 18.7 Km



-25

-20

-15

-10

-5

0

5

1525 1535 1545 1555 1565 1575 1585 1595

Po

wer (d

Bm

)

Wavelength (nm)


• System provide larger margin for lower channel counts – Provides choice of

the total capacity

depending on the

span loss change

over time

(e.g. > 68.2 dB)

• Changes in average OSNR – 10 Chs -> 30 Chs -> 50 Chs -> 100 Chs -> 150 Chs

– 23.2 dB -> 20.1 dB -> 18.6 dB -> 15.7 dB –> 14.2 dB

• Changes in average Q – 10 Chs -> 30 Chs -> 50 Chs -> 100 Chs -> 150 Chs

– 11.6 dB -> 10.2 dB -> 9.8 dB -> 8.3 dB –> 7.0 dB

Transmission Performance with Channel Growth

6

8

10

12

14

16

18

20

22

24

1525 1535 1545 1555 1565 1575 1585 1595

OS

NR

an

d Q

(d

B)

Wavelength (nm)

OSNR for 10CHs

OSNR for 30CHs

OSNR for 50CHs

OSNR for 100CHs

OSNR for 150CHs

Q for 10CHs

Q for 30CHs

Q for 50CHs

Q for 100CHs

Q for 150CHs

Performance over the 68.2dB span loss (409.6 km)


• 15 Tb/s (150 x 120 Gbit/s) unrepeatered transmission over 409.6 km of G.654B fiber – Corning® Vascade® EX2000, span loss of 68.2 dB

– Record Capacity x Reach: 6.14 Pbit/s-km

• Unrepeatered transmission with channel growth up to 150 x 120 Gbit/s – System does not need loading channels.

– System provides more margin for lower capacity.

• Results provide practical solution for the deployment of new systems with ultra-high capacity. – Span consists of single fiber type (G.654B).

– Achieved with commercial DWDM system which includes production Raman

pump modules and 100G channel cards

Summary / Conclusion

100G + Raman Powering Submarine and

Terrestrial Networks

Thanks

Any Questions ?

2014 11 14-15_t-unrepeatered-transmission-over-409-6-km-acp-2014-af4b-4-post-deadline-paper-presentation-xtera

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