Demonstration and Performance Analysis of 4 Tb/s DWDM Metro-DCI System with 100G PAM4 QSFP28 Modules. Presented at OFC 2017.

1. Mark Filer1, Steven Searcy2, Yang Fu3, Radha Nagarajan3, and Sorin Tibuleac2
1. Microsoft Corporation, Redmond WA, 2. ADVA Optical Networking, Norcross GA, 3. Inphi Corporation, Santa Clara CA

2. Azure WAN
Backbone
Region
Regional architecture
long haul
≤ 70 km
4/8/16 pair

3. Unique aspects of Microsoft DCI
Microsoft DCI fiber plant distance and loss distributions

4. PAM4 QSFP28 DWDM transceiver
PAM4
4 Tb/s

5. EDFA
L2/3switch
36xQSFPLinecard
Mux/Demux
EDFA
TDCMx4
QSFP28
...
DCF
QSFP28QSFP28QSFP28QSFP28
QSFP28
QSFP28
QSFP28
fiber
span
VOA
x36
ADVA SmartAmp
System diagram

6. CD tolerance

7. 80 km transmission Delivered OSNR
Q-factor

8. Nonlinear tolerance

9. Span loss tolerance
practical FEC limit

10. Demonstration of commercial 100G PAM4 transceiver and
open line system
Supports 4 Tb/s up to 80 km with margin
Line system performance and features make deploying at
cloud-scale feasible with sufficient margins
Summary

11. mark.filer@microsoft.com