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Presented at 2011 Spring Internet2 Meeting, Arlington, VA, Apr. 19, 2011
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Next Gen Optical Transport From 100Gb/s to 1Tb/s and Beyond
Drew Perkins: CTO, Infinera
The key building blocks to achieving Terabit transport are well understood
Successful implementation requires more than just functionality, it must also enable end-user differentiation
Optical Programmability, Photonic IC’s & Switched DWDM are essential to ensuring success
2 © 2011 Infinera Corporation Confidential & Proprietary
What I want you to take away from this presentation
A Better Way to 100G
3 © 2011 Infinera Corporation
Technological Approaches to Increase Link Capacity
Time Division Multiplexing (ie: Baud Rate)
10 Mbps
100 Mbps
1 Gbps
10 Gbps
100 Gbps
Space Division Multiplexing (ie: Parallel Optics)
1
4
12
8
Modulation (ie: Bits per Hz)
1 (e.g. NRZ)
2 (e.g. PAM-4, (D)QPSK, QAM-4)
4 (e.g. QAM-16)
8 (e.g. QAM-256)
Wavelength Division Multiplexing
(i.e. ls) 1 2 4 6 8 10
DWDM CWDM
© 2011 Infinera Corporation
Advanced Modulation Formats
Pol-Mux QPSK Pol-Mux
8-QAM
Pol-Mux 16-QAM
IM-DD
PM- BPSK
1.6 8 12 16 24
C-Band Capacity (Tb/s)
0
0.2
0.4
0.6
0.8
1
1.2
Cap
acit
y *
Re
ach
Pro
du
ct
5 © 2011 Infinera Corporation
wavelength demux
DWDM Direct Detection
PD
Spacing on the fiber needed between waves: “Guard Bands”
Spatially separate the
channels using a
wavelength demux
6 © 2011 Infinera Corporation
wavelength demux
Spatially separate the
channels using a
wavelength demux
DWDM Coherent Detection
Spacing on the fiber needed between waves:
“Guard Bands”
ADC DSP PD LO
Use a local oscillator to choose the “color” we want
to “detect” to match the demux port color
7 © 2011 Infinera Corporation
Large Scale Photonic Integration is essential
500G Tx PIC
500G Rx PIC
Number of channels 5 x 100G
Monolithic InP Chips 2
Optical elements > 600
“Gold Box” Replacements > 100
Fiber Replacements > 400
COST
SIZE
POWER CAPACITY
RELIABILITY
8 © 2011 Infinera Corporation Confidential & Proprietary
More practical implementation • Lower cost
• Smaller footprint
• Higher reliability
FlexCoherentTM (Programmable) Modulation • Build more functions into one ASIC
• Amortize ASIC cost over multiple wavelengths
Switched DWDM - Everywhere • Making more bandwidth available for revenue generating services
9 © 2011 Infinera Corporation
For 100G, Large Scale PICs Enable…
Beyond 100G: The Dawn of the Terabit Age
10 © 2011 Infinera Corporation
A Vision for the Next Generation Terabit Networks
© 2011 Infinera Corporation 11
1Tb/s Single Carrier: The A/D Converter Problem
1 2 4 6 8 10 12
1
2
3
4
5
6
7
8
9
10
OSN
R P
enal
ty (
dB
)
Number of bits per symbol
PM-BPSK 640GBaud
PM-QPSK 320GBaud
PM-8QAM 210GBaud
PM-16QAM 160GBaud
PM-32QAM 128GBaud
PM-64QAM 105GBaud
By 2014 commercial ADCs are expected to operate at ~64GBaud
How 1Tb/s Might Look… Conventional WDM vs FlexChannels
Guard bands to allow for individual wavelength demux
Fewer guard-bands
25% increase in useable amplifier spectrum
Conventional Per-Channel WDM Filtering
1Tb/s
Multi-Carrier FlexChannel
1Tb/s
12 © 2011 Infinera Corporation
Reach, Spectral Efficiency, and Co-Existence
1Tb/s PM-8QAM FlexChannel
1Tb/s PM-16QAM FlexChannel
10x100G PM-QPSK 1Tb/s PM-QPSK
FlexChannel
or
A E
B C
D
13 © 2011 Infinera Corporation
Fiber Capacity
Advanced Modulation
Coherent Detection
Advanced FEC
Foundation Features
Large Scale PICs 1
Programmable Modulation 2
Switched DWDM Everywhere 3
Differentiators For Service
Providers
Summary: Proposing a best practice for 100G
14 © 2011 Infinera Corporation Confidential & Proprietary
Thank You! [email protected]
© 2011 Infinera Corporation 15