11 Nov. 2015 | Data Center World 2015 | Frankfurt
Passive 100G DC Interconnect
Challenges and Solutions
• Susmita Adhikari
• 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
• Phone +49 6131 69851 225
• Mobile +49 151 649 618 09
• Skype adhikari_cubo
11 Nov. 2015 | Data Center World 2015 | Frankfurt
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