passive 100g dc interconnect: challenges and solutions

11 Nov. 2015 | Data Center World 2015 | Frankfurt

Passive 100G DC Interconnect

Challenges and Solutions

• Susmita Adhikari

• [email protected]

• 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?


Metro 100G Gap

Power

Space

Bandwidth

Cost per

bit

Coherent

Direct Detect


• 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


100G Coherent Coherent

Longhaul

Metro


• 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


100G Direct Detect


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.)


PA

SS

IVE

AC

TIV

E

SNMP

1310

DCAC

13101310


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


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


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)


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


• 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


Conclusion

Questions?

• Susmita Adhikari

• [email protected]

• Phone +49 6131 69851 225

• Mobile +49 151 649 618 09

• Skype adhikari_cubo

11 Nov. 2015 | Data Center World 2015 | Frankfurt

passive 100g dc interconnect: challenges and solutions

Technology