passive 100g dc interconnect: challenges and solutions

11 Nov. 2015 | Data Center World 2015 | Frankfurt

Passive 100G DC Interconnect

Challenges and Solutions

• Susmita Adhikari

• susmita.adhikari@hubersuhner.com

• Phone +49 6131 69851 225

• Mobile +49 151 649 618 09

• Skype adhikari_cubo

Excellence in Connectivity Solutions 11 Nov. 2015 | Data Center World 2015 | Frankfurt 2

Data Center Metro Interconnect

Excellence in Connectivity Solutions

• In last 2 years,100G surged 10x but

majority is long haul deployments

(75% in 2014)

• In 2016, 50% of deployments will be

100G in metro regional and access

markets

11 Nov. 2015 | Data Center World 2015 | Frankfurt 3

100G Metro DCI- Reality Check

0%

20%

40%

60%

80%

100%

2012 2013 2014 2015 2016 2017 2018 2019

Po

rts

(%)

Year Long Haul (>600km)

Metro (<600km)

Metro Access (<100km)

So

urc

e: IH

S In

fon

etic

s, A

pril 2

01

5

Is there a right 100G solution?

Excellence in Connectivity Solutions 11 Nov. 2015 | Data Center World 2015 | Frankfurt 4

Metro 100G Gap

Power

Space

Bandwidth

Cost per

bit

Coherent

Direct Detect

Excellence in Connectivity Solutions

• Developed for ultra-longhaul -> adapted for metro

• Complex phase & amp modulation, less sensitive to CD & PMD, so wider reach

• 1 lambda per 100G used

• Tunable

• Power reduced to 32W

11 Nov. 2015 | Data Center World 2015 | Frankfurt 5

100G Coherent Coherent

Longhaul

Metro

Excellence in Connectivity Solutions

• Based on simpler PDs, reach limited by CD & PMD

• 4 x 25Gb/s ODB per 100G used

• 4 lambda per 100G used

• 50Ghz or 100Ghz ITU-T grid

• Fixed

• Tunable

• Power < 24 W

11 Nov. 2015 | Data Center World 2015 | Frankfurt 6

100G Direct Detect

Excellence in Connectivity Solutions

SNMP

1310

DCAC

Active vs. Passive

• Conversion from client (“grey transceivers”)

to line (“colored transceivers”) signals by

transponder cards

• Since being “active” a chassis with power

and management (SNMP) is needed

• Flexible but complex

• No conversion, transport transceivers are

plugged straight into terminal equipment

• Less active elements => higher reliability, less

latency

• Transceivers are managed by terminal

equipment (Switch, DSLAM, etc.)

11 Nov. 2015 | Data Center World 2015 | Frankfurt 7

PA

SS

IVE

AC

TIV

E

SNMP

1310

DCAC

13101310

Excellence in Connectivity Solutions 11 Nov. 2015 | Data Center World 2015 | Frankfurt 8

Coherent vs. Direct Detect 100G in Metro

100G Coherent 100G Direct Detect

Power <32W <24W

Space CFP CFP2-ACO (requires external DSP)

CFP CFP2 in roadmap

Bandwidth (10G) 10X 2.5X

Cost per Bit (10*10G -X)

4.8X 1.6X

Complexity Transponder required No transponder required

Excellence in Connectivity Solutions 11 Nov. 2015 | Data Center World 2015 | Frankfurt 9

Overlaying 10G DWDM with 100G DD

10G SFP

4 in 100GHz 100G CFP

….

Amplification

Compensation

100GHz DWDM

Mux

10G SFP

100GHz DWDM

Mux

50/100 GHz INT

….

….

100GHz

4x25G CFP output

100GHz

10G SFP

Odd channels

Even channels

Complementing existing 10Gbps DWDM system with 100Gbps upgrades

Excellence in Connectivity Solutions 11 Nov. 2015 | Data Center World 2015 | Frankfurt 10

100G Metro Network Architectures 100G in C Band

10G DWDM + 100G DWDM overlay

100G DWDM

Maximum capacity 1.6 Tbps (=12*4*25G+40*10G)

2.4 Tbps (= 24*4*25G)

Number of wavelengths

88 96

Number of transceivers

52 (12*100G, 40x 10G)

24 (24*100G)

Maximum distance < 100 kms (EDFA) < 100 kms (EDFA)

Typical transceiver CFP DWDM (direct detect)

CFP DWDM (direct detect)

Excellence in Connectivity Solutions 11 Nov. 2015 | Data Center World 2015 | Frankfurt 11

Future Outlook

• Metro access market is only going to

grow

• Not just about datacenter interconnect-

enterprise, IXs, financial institutes

• Direct Detect deployments supersede

coherent after 2018

• Coherent opted when spectral

efficiency required, otherwise DWDM

Direct Detect proves to be the optimal

solution

Source: IHS Infonetics, April 2015

Excellence in Connectivity Solutions

• 100Gbps is quickly becoming de facto transmission solution for fiber constraint areas and native 100G port transport demanding applications

• 100Gbps Direct Detect is simple and low cost solution.

• 100Gbps Coherent is spectrally efficient but price and complexity remains major issue

11 Nov. 2015 | Data Center World 2015 | Frankfurt 12

Conclusion

Questions?

• Susmita Adhikari

• susmita.adhikari@hubersuhner.com

• Phone +49 6131 69851 225

• Mobile +49 151 649 618 09

• Skype adhikari_cubo

11 Nov. 2015 | Data Center World 2015 | Frankfurt