100G Enterprise - TERENA Networking Conference 2010

Report
100-Gb/s Transport – A Reality Check
TNC2010, Vilnius, May 2010
Dr. Klaus Grobe, Sr. Principal Engineer, ADVA Optical Networking, Advanced Technologies
100G Transport Techniques
2
© 2010 ADVA Optical Networking. All rights reserved. ADVA confidential.
Modulation Formats ABC
A transmitted signal s(t) can be described as:
Ak  A1 , A2 , ..., An ,
s(t )   Ak q(t  kT )
Aj  Aj  e
k
q(t) – pulse shape, Ak – symbols containing the information
RZ-OOK
NRZ-OOK
-
+
-
0 1
1
0 0 1
+
0 1 1 0
0 1
0 1
NRZ-DPSK
CSRZ-OOK
1 0 0 1
+
-
+ - - - + - 0 1 1 0 0 1
RZ-DPSK
+ - - - + - 0 1 1 0 0 1
PM-NRZ-DQPSK
Phase-Shift Keying (phase modulation)
Quaternary (4-state modulation)
Differential (pre-coding)
Non-Return-to-Zero (pulse shaping)
Polarization-Multiplexed (a.k.a. Dual-Polarization, DP, a.k.a. Orthogonally-Polarized, OP)
3
© 2010 ADVA Optical Networking. All rights reserved. ADVA confidential.
j j
100G constellation diagrams…
Im
QPSK
Im
Re
6PSK
Im
8PSK
Im
8QAM
Re
Re
Re
 Various
modulation
schemes –
PSK, QAM, …
 NRZ vs. RZ
(duty cycle)
Im
Bipolar
6ASK
Im
Re
Im
16PSK
Re
4
9QAM
Im
DP-QPSK
Re
Im
16QAM
Re
Re
Re
Im
16QAM
Im
DP-8PSK
Im
DP-16QAM
Re
© 2010 ADVA Optical Networking. All rights reserved. ADVA confidential.
Re
 Multi-carrier
 OSNR
optimum for
(DP-) QPSK
(coherent)
Cost-efficient 100G transport
 Different reach domains – 200 km vs. 2000 km
 Different requirements regarding protocol transparency, latency,
spectral efficiency, …
 Leads to (at least) two different implementations, using
different modulation at different cost points
LH / Backbone, <2000 km SMF
1 x 112 Gb/s (28 GBd) Coherent PM-QPSK
Enterprise, <200 km SMF
4 x 28 Gb/s DWDM / SCM
Different solutions at different cost points!
5
© 2010 ADVA Optical Networking. All rights reserved. ADVA confidential.
Cost-optimized 100G
Transport
6
© 2010 ADVA Optical Networking. All rights reserved. ADVA confidential.
High-speed Transport Roadmap
40G & 100G Transport Cards in FSP 3000
100G: LH
100G Carrier Core
40G: 1st Gen.
40G: Highly-Tolerant
40G Carrier Core
100G: Enterprise
100G Enterprise
2009
7
2010
2011
© 2010 ADVA Optical Networking. All rights reserved. ADVA confidential.
2012
90°
QPSK
Coder
Driver
Filter
PBS
LO
PC
90°
90°
Hybr.
0°
Client I/F (CFP)
PBC
90°
FEC, Framing, Monitoring
PC
PBS
PC
Digital Filter (FFE)
CW
LD
0°
ADC
90°
90°
Hybr.
ADC
Driver
Filter
ADC
FEC, Framing, Monitoring
Client I/F (CFP)
QPSK
Coder
ADC
112G Coherent PolMux-QPSK
Im
PM-QPSK
 Highest performance 100G transport, but highest complexity (cost)
 Supports 50 GHz DWDM with 28 GBd and 2 (bit/s)/Hz spectral
efficiency, ROADM networking, and 1500…2000 km reach
 Digital filter for 4x28 Gb/s (necessary for Polarization demultiplexing,
dispersion compensation, etc.) not yet available
 ADVA is part of Georgia Tech consortium which follows PM-QPSK
8
© 2010 ADVA Optical Networking. All rights reserved. ADVA confidential.
Re
ADVA Tests on PM-DQPSK w/ WSS
Transmitted over ~540 km (6 spans) with Wavelength-Selective Switches
 OSNR: 22.6 dB
 WSS, EDFAs and DCMs from current
ADVA product line
90°
28 GHz Clock
6X
PC
WSS
PC
EDFA
90 km SSMF
EDFA
PBS
PC
28 Gb/s Data B
DCM
Y Polarization
(Q)
(I)
Q = 3.83
9
(I)
Q =3.48
R
T-
R
WSS
PBS
X Polarization
T+
BERT
28 Gb/s Data A
CW
(Q)
Q = 3.09
© 2010 ADVA Optical Networking. All rights reserved. ADVA confidential.
Q =3.24
Carrier Core Trans/Muxponder
 High-performance network interface
Im
PM-QPSK
 PM-QPSK with coherent detection (OIF standard)
 50 GHz channel spacing
Re
 Long-Haul capability
 >1500 km reach
 Dispersion (CD, PMD) compensation
 Strong FEC
 G.709-compliant mapping, multiplexing
 Services
 100GbE (IEEE802.3ba), OTU4 (G.709)
 10 x 10GbE / STM-64 / OC-192
4 Slots
10
4 Slots
© 2010 ADVA Optical Networking. All rights reserved. ADVA confidential.
Low-Cost / Data Center 100G Transport
 Application areas
Why latency matters
 Storage/SAN connectivity
Reasons for (differential) latency
 LAN/HPC/Cloud connectivity
Link Group Delay, 100 km round-trip = 1 ms
 10GbE metro transport
Multiplexing, mapping, framing, typ. <100 µs
FEC, up to 100 µs, differential delay!
 Client protocols
 10x10GbE, native 100GbE
High-end requirements
 12x8G-FC, 6x16G-FC
Total delay, e.g., clustering, <10…100 µs
Differential delay, e.g., GDPS, <500 ns
 IB QDRx8, EDRx4
 Distance often <100 km
 Low latency
Counter-actions
Low-latency design
Avoid FEC
 Benchmark
Short links
 Cost of 10 x 10G DWDM T-XFPs
 2.5 x total system capacity compared to T-XFPs @ 50 GHz
11
© 2010 ADVA Optical Networking. All rights reserved. ADVA confidential.
Rx
Rx
Rx
 Multi-Carrier Modulation - 4 directly modulated lasers (DML)
 4x28G, spectral efficiency 0.5…1 (bit/s)/Hz
 Low power consumption, very small footprint
 Low latency design, optional FEC bypass
()3
Optical Client I/F
+
4 x ODB Coders
DMX
R
+
DMX
~
R
R
R
Optical Client I/F
Proof of concept of 4x25G transmission in 100GHz
[K. Yonenaga et.al., JThA48, OFC/NFOEC 2008]
12
© 2010 ADVA Optical Networking. All rights reserved. ADVA confidential.
Client I/F
Rx
FEC
Filter/Splitter
DML
ITU-T DWDM
DML
ITU-T DWDM
DML
4:1 Coupler
DML
FEC
Client I/F
Low-cost 100G Data Center Transport
100G Enterprise Muxponder
10TCE-PCN-10GU+100G
 Low-cost network interface design
 DML with enhanced dispersion tolerance
 Pluggable optics
 Clients: Multi-rate SFP+ 850/1310nm
 Network: based on CFP
CFP
4 x 28 Gb/s
DWDM
 4 x 28 Gb/s DWDM multi-carriers
 Record compactness
 2-slot card
SFP+
 800 Gb/s per shelf
 2 Tb/s per 80 channels / 50GHz
 6.4 Tb/s per ETSI footprint
 Complemented by 100GbE transponder
(WCE-PCN-100G)
13
© 2010 ADVA Optical Networking. All rights reserved. ADVA confidential.
Implementation and Variants
Client
Interface
Module
14
MDIO
Main Board
Quad
Laser Driver
DML
DML
DML
DML
Quad
PIN-TIA
CAUI
4:10
Gearbox IC
FCE
Skew Mgmt.
SFP+
Line OAM/ECC
…
1:10 Mux
SFP+
Rate Adapt.
SFP+
MLD/PCS Mon.
10x11.18G
4:10
Gearbox IC
Power Supply
MDIO/Ctrl.
Pluggable
© 2010 ADVA Optical Networking. All rights reserved. ADVA confidential.
25 GHz Variants
25 GHz WDM Grid
100 GHz WDM Grid (SCM)
DML
25G-locked
DML
25G-locked
Power [dB]
DML
MX
DML
100 GHz
DWDM
-20
-40
-60
1
DX
DML
Quad
Laser Driver
DML
DML
DP-QPSK
DML
Quad
PIN-TIA
DML
Quad
PIN-TIA
Quad
Laser Driver
0
P
Optics Module
 Alternatively, 4x28G-to-100-GHz optics for Sub-Carrier Multiplexing
© 2010 ADVA Optical Networking. All rights reserved. ADVA confidential.
1
Normalized Frequency
 Filtered DML can directly support 25-GHz DWDM grid
15
0
100G Solution Comparison
16
100G Enterprise
100G Long-haul
Single/multi-Carrier
4 x 28 Gb/s DWDM (SCM)
Single Carrier
Modulation
NRZ Filtered DML with
Direct Detection
NRZ-DP-QPSK with
Coherent Intradyne
Detection + DSP
Spectral efficiency [b/s/Hz]
C-Band Capacity [Tb/s]
0.5…1.0
2…4
2
8
OSNR [dB], Reach [km]
22 dB w/ FEC,
28 dB SCM w/ FEC,
28 dB w/o FEC,
34 dB SCM w/o FEC,
CD Tolerance [ps/nm]
Mean PMD Tolerance [ps]
-250...+500 w/o TDC
5 @ 1 dB OSNR Penalty
>40,000 (FFE)
>30 (FFE)
Size (slots)
Power consumption [W]
2
95
4
120
Target Cost [relative]
50%
100%
600 km
200 km
200 km
50 km
15 dB, >1,500 km
© 2010 ADVA Optical Networking. All rights reserved. ADVA confidential.
Conclusion
 Cost-optimized 100G transport needs differentiated solutions,
depending on applications’ reach (and spectral eff.) needs
 Data center / HPC also require low latency
 Mixture of high-performance Coherent DP-QPSK and low-cost,
latency-optimized Multi-Carrier Modulation
 Mix of two solutions does not cause significant OpEx mark-up,
but reduces CapEx significantly for DC/HPC/access applications
 100G deployment can start with low-cost variant, moving these
transport cards to less-utilized links later
17
© 2010 ADVA Optical Networking. All rights reserved. ADVA confidential.
Thank you
[email protected]
IMPORTANT NOTICE
The content of this presentation is strictly confidential. ADVA Optical Networking is the exclusive owner or licensee of the content,
material, and information in this presentation. Any reproduction, publication or reprint, in whole or in part, is strictly prohibited.
The information in this presentation may not be accurate, complete or up to date, and is provided without warranties or representations
of any kind, either express or implied. ADVA Optical Networking shall not be responsible for and disclaims any liability for any loss or
damages, including without limitation, direct, indirect, incidental, consequential and special damages, alleged to have been caused by
or in connection with using and/or relying on the information contained in this presentation.
Copyright © for the entire content of this presentation: ADVA Optical Networking.
18
© 2010 ADVA Optical Networking. All rights reserved. ADVA confidential.

similar documents