The document discusses the evolution of 100G and beyond networking technologies. It notes that 100G found adoption in core and metro networks by leveraging existing ecosystems through coherent and direct detect solutions. Pressure to lower costs while increasing capacity continues. The next technologies being developed include 400G using higher symbol rates and software-defined optics leveraging techniques like flexible grid, multi-level modulation, and discrete multitone transmission. This will enable the transition from fixed DWDM networks to software-defined optical networking with more programmability and efficient use of spectrum.

1. Jörg-Peter Elbers, VP Advanced Technology
OFC 2014 – Market Watch Panel 2:
What’s Happening for 100G and Beyond Ecosystems?
100G – What Comes Next?

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Diverse 100G Transport Applications
Two classes: Efficient connectivity vs. high-performance networking
Application Reach OADMs
10G
Legacy
Fiber
Cost
Enterprise 100 km None Yes
Metro Access 250 km Few Yes
Metro Core 500 km <20 Some
Regional 1000 km <10 No
Long-Haul 2500 km <5 No
Class1Class2

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100G – Where Do We Stand Today?
Leveraging established eco-systems has been crucial.
Efficient connectivity:
„Scale up from datacom“
Leverage:
• 100GBASE-LR4 ecosystem
• 10G DWDM transmitters
Solution:
• 100G Direct Detect
• 4x28G DWDM
Sweet Spot:
• P2P interconnects
High-performance networking:
„Scale down from LH telecom“
Leverage:
• OIF 100G LH DWDM framework
• Relaxed specifications
Solution:
• 100G Coherent
• DP-QPSK
Sweet Spot:
• Metro & core networking

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Are We Done?
Need to balance cost, power, size with fiber capacity & reach.

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Efficient connectivity:
„Scale up from datacom“
Beyond 100G – The Innovation Toolkit
High-performance networking:
„Scale down from LH telecom“
Evolution to more capacity, programmability and lower cost per bit.

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Beyond 100G – Coherent Networking
SW-Defined Transceivers Flexible Grid Optical Layer
Optical Spectrum as a ServiceTransport SDN
Symbol rate (SR) is additional parameter:
• 400G leverages 100G (~30GBd)
• 1T needs 2..3x SR (~75GBd)
50GHz
spaced
channels
Future higher-
speed channels
Maximum
spectral
efficiency
super-
channels
OpticalPower
l nm
From fixed DWDM to software-defined optical networking.

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Beyond 100G – Direct Detect Connectivity
Integrated 25G TX/RX Arrays Single Mode Fiber & DWDM
Multi-Level Modulation Discrete-Multitone Transmission
From fixed DWDM to software-defined connectivity.
0 20 40 60 80
-0.5
0
0.5
1
1.5
2
t [ps]
PAM
Source:Oclaro
Source:Intel
0 5 10 15 20 25 30
0
1
2
3
4
5
6
7
f [GHz]
No.ofBits
DMT

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Summary
• 100G found rapid adoption in core & metro networks
• Requirements led to emergence of coherent & direct detect solutions
• Established eco-systems have been crucial for commercial adoption
• Pressure to lower cost, power, size while increasing capacity continues
• The next thing: 400G & software-defined optics!

9. jelbers@advaoptical.com
Thank you
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WDM Grid
Modulation 4ch QPSK +2ch 16QAM 50GHz 25GHz
Spectrum Usage [THz] 107 86.2 66.35 60.47
Spectrum Usage [%] 100% 81% 62% 57%
77% 70%
91%
Fixed Flexible
Software-Defined Optics
FlexGrid @ 25 GHz
Fixed Grid
DP-QPSK + DP-16QAM
Fixed Grid
DP-QPSK
• Germany 14
• fully meshed
400G demand
with opt. protection
Spectrum Allocation
Use Case
FlexGrid @ 50GHz
-19%
-19%
-5%
19% spectral efficiency gain on fixed grid with 400G DP-16QAM
38% spectral efficiency gain with FlexGrid @ 50GHz
Smaller incremental gain (additional 5%) with FlexGrid @ 25GHz