2015 10 07 - efficient optical transport layer for high-capacity optical networking - wdm usa 2015...

© 2015 Xtera Communications, Inc. Proprietary & Confidential 1

Efficient Optical Transport Layer for High-Capacity Optical Networking

Philippe Perrier – Corporate VP, Product Line Management – Xtera Communications

Next Generation Optical Networking North America 2015 (6-7 October 2015 – Dallas, USA)


Outline:

• Capacity trends: Why and how much?

• New players: New types of service providers and network operators with new requirements

• Case study: Efficient Long-Haul DCI as enabled by coherent technologies and Raman optical amplification


Capacity Trends: Why and How Much?

Every Minute…

Facebook users share nearly 2.5 million pieces of content.

Twitter users tweet nearly 300,000 times.

Instagram users post nearly 220,000 new photos.

YouTube users upload 72 hours of new video content.

Apple users download nearly 50,000 apps.

Email users send over 200 million messages.

Amazon generates over $80,000 in online sales.

Google receives over 4,000,000 search queries.

Pandora users listen to 62,000 hours of music.

Yelp users post 26,000 reviews.

Skype users connect for 23,300 hours

Tinder users swipe 416,667 times.

WhatsApp users share 347,222 photos. Source: Simon CooperCOO, NEXTDC Limited

SNW Singapore 2015 Presentation


Analysis of the growth in core network traffic (purple curve) since the dawn of the Internet era in terms of the constituent five-year trend segments (data shown with expanded scales). Source: Bell Labs Consulting.

… Leading to Huge Growth inCore Network Traffic

1st era of the internet 2nd era


Capacity and Reach Limitations With EDFA-Based Networks


32

0

4

12

1620

36

64

Tbit/s

8

2428

40

4448

52

56

60km

88 x 100G

88 x 200G

110 x 200G

Narrow amplification spectrum Limited fiber capacity

Reduced reachDecreases when capacity increases

Capacity and Reach Limitations With EDFA-Based Networks


New Networks Requirements

• Dense, mesh network with many traffic locations

• Fibers owned, plenty of dark fibers available

Traditional Telecom NetworkTraditional Telecom Network

• Sparse network with very few traffic locations Long reach

• Fiber leased, large pipes needed between few sites High capacity

• Technical/commercial benefits from skipping sites Long spans

Data Center Operator NetworkData Center Operator Network

• Technical + commercial innovations

• Instead of back-to-back terminal equipment (red sites), long span capability enables deployment of optical line amplifiers at these sites or to skip some of these sites. Long reach and high capacity

Backhaul Networks for Subsea Cable Systems

London

Dublin

Backhaul Networks for Subsea Cable Systems

• Network made up of leased fibers with few traffic locations

• Network used to backhaul subsea capacity High capacity

• Sparse population distribution and power availability issues Long spans

Emerging Region NetworkEmerging Market Network

• Optical networks built over power grids

• By design, fiber drops at very few locations Long spans

OPGW NetworkOPGW Network Over Power Grids


Efficient Long-Haul DCI With Coherent and Raman Technologies

Long Reach High Capacity Low Latency Cost Effective


Evolution from Land to SeaAdvent of 100G/100G+ Coherent Technologies

Polarization Multiplexing(PM)

Multi-level modulationformat

Opto-electronics

Dual (N)-carrierimplementation

30 Gbaud 100 Gbit/s50 Gbit/s

QPSK100GPM-QPSK


16QAM200GPM-16QAM

≤ 50 GHz

l

400 Gbit/s(N x 200 Gbit/s)


16QAM400GDC-PM-16QAM

N-level modulation format + Coherent detection + Digital signal processing

Advent of 100G/100G+ Coherent Technologies

• 100G and 200G carrier technology whenever possible.

• 200G reduces the cost per bit considerably.

• In the midterm, 400G / 1T / etc. channels are a combination of 200G carriers.

• But 200G carriers require higher Optical-to-Signal Noise Ratio (OSNR) and are more sensitive to fiber nonlinearities.

Higher-performance amplification scheme needed!

Year0,00

1,75

3,50

5,25

7,00

8,75

2019

10G revenues

40G revenues

100G revenues

100G+ revenues

Source: Ovum

2011 2012 2013 2014 2015 2016 2017 2018

DW

DM

lin

e c

ard

re

ve

nu

es (

$B

)

Advent of 100G/100G+ Coherent Technologies


Key Technologies for Optical Transport

-30

-25

-20

-15

-10

-5

0

5

1515 1535 1555 1575 1595 1605

Po

we

r (d

Bm

)

1625

Wavelength (nm)

100 nm of continuous

optical spectrum

in the field since 2004

3 spectrum

2 reach

6 [Capacity x Reach] metric

Wise RamanTM Amplification Solution

Google (ECOC – Sept 2014): Spectrum efficiency (bit/s/Hz) is now close to the Shannon limit… Need to either:

– Increase the # of fibers: too expensive

– Increase the # of cores: too long term (10+ year) solution

– Expand the spectrum width (without compromising the reach)

Optical spectrum available in existing fiber plants.

Fib

er

att

enuation

Optical spectrum

Oldfibers

Modernfibers

Traditionalapproach

Xtera solution

1550 nm window1300 nm window

Wise RamanTM EvolutionMore Spectrum


Wise RamanTM Amplification Solution


Efficient DCI With Coherent and Raman TechnologiesLong-Haul DCI SolutionsLong Span


Efficient DCI With Coherent and Raman Technologies150 x 100G Single-SpanTransmission – 410 km / 68.2 dB

-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)

289 km

ROPA

121 km

Gain fromforwardRamanpumping

Gain from backward

Raman pumping

Fiber attenuation

150 wavelengths

Gainfrom

ROPA

Pe

r ch

an

ne

l po

we

r (d

Bm

)

Transmission distance (km)

LRA (Discrete Raman amplifier) LRA

<Pout> = -2.8dBm/ch <OSNR> = 14.2dB

G.654B fiber


Efficient DCI With Coherent and Raman TechnologiesLong-Haul DCI SolutionsLong Span


Efficient DCI With Coherent and Raman Technologies150 x 100G TransmissionOver 2 Spans – 630 km / 118 dB

• Span 1: G.654C fiber; 330km (59dB)

• Span 2: G.652D fiber; 300km (59dB)

-25

-20

-15

-10

-5

0

5

1525 1535 1545 1555 1565 1575 1585 1595

Pow

er

(dB

m)

Wavelength (nm)

ROPA

LRA LRALRA

Span 1

ROPA

Span 2

-25

-20

-15

-10

-5

0

5

1525 1535 1545 1555 1565 1575 1585 1595

Po

we

r (d

Bm

)

Wavelength (nm)

-25

-20

-15

-10

-5

0

5

1525 1535 1545 1555 1565 1575 1585 1595

Po

we

r (d

Bm

)Wavelength (nm)

100 km 110 km

<Q> = 7.0dB


Efficient DCI With Coherent and Raman TechnologiesLong-Haul DCI SolutionsLong Reach


Conclusion

• Field-proven technologies can offer up to 64T fiber capacity over 1,500+ km on existing fiber plants.

• Raman amplification key to meeting long-haul DCI requirements.

– Even in the case of open-line system

• Convergence between terrestrial and subsea transmission technologies for unified DC-to-DC connectivity.


Thanks for your attention

Any questions?

2015 10 07 - efficient optical transport layer for high-capacity optical networking - wdm usa 2015...

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