The document discusses options for high-capacity interconnects in data centers, particularly focusing on 100Gbit/s DWDM solutions and their various configurations. It highlights the advantages of coherence over direct detection, the importance of dispersion management, and the flexibility provided by open DCI line systems. Additionally, the content includes technical specifications and features of different DCI applications and terminal equipment.

1. Jörg-Peter Elbers
OFC panel: Line side 100Gbit/s DWDM network solutions – debating the options
for the data center interconnect?
Coherent or direct detect

2. © 2019 ADVA. All rights reserved.22
Data centers require high-capacity interconnects
DC
spine
switch
DWDM
transponder
DC
edge
router
Core OLS
Customer
traffic
DCI OLS
It's good to have a choice – open line system and best-of-breed terminal optics
Ring or mesh
100s-1000s of km
Fiber scarce
Point-to-point
<80km distance
Can be fiber rich
Core connectivity
DCI connectivity

3. © 2019 ADVA. All rights reserved.33
• High performance and spectral efficiency
• On-board and CFP(2) form factors
• 100Gbit/s to 600Gbit/s available today
• DSP-based dispersion compensation
• “Good enough” for P2P DCI applications
• The only solution in QSFP28 form factor
• 100Gbit/s available today
• Needs optical dispersion compensation
Direct detectCoherent
How should dispersion be managed for direct detect?
DWDM line-side options for DCI applications
DWDM
QSFP28CFP2-DCO
DWDM terminal with
on-board optics

4. © 2019 ADVA. All rights reserved.44
Smart amplifier offers coherent-like automation for direct detect optics
Operational simplicity for direct detect
• Automatic dispersion measurement
• Automatic dispersion compensation
• Automatic gain, tilt, and power setting
• Optional integrated OTDR
• Optional optical channel monitor
Smart features
+ =
Configuration
provisioning
Monitoring
alarms
TACACS+
Radius
CLI
REST
NETCONF
WebGUI
Zero touch prov
SNMPv2c
REST
NETCONF
Streaming telemetry
FCAPS Control
REST

5. © 2019 ADVA. All rights reserved.55
Highest capacity, functionality and flexibility with DWDM terminal –
Lowest rack space with DWDM QSFP28 in switch/router
Which line side option to pick? It depends …
38.4
19.2
9.6
4.8
0
10
20
30
40
50
600G Coh. 200G Coh. 100G Coh. 100G PAM4
C-bandcapacity(Tbit/s)
Modulation format
CFP2-DCO
DWDM
QSFP28
DWDM terminal with
on-board optics

6. © 2019 ADVA. All rights reserved.66
The good news? An open DCI line system supports all!
Open APIs
Pre-amp
Pre-ampBooster
Booster
WDM filter
Open APIs
WDM filter
Switch/router
with PAM4 QSFP28
Coherent interfaces
Switch/router
with PAM4 QSFP28
Coherent interfaces
Disaggregated
terminal equipment
Disaggregated
terminal equipment

7. Thank you
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jelbers@advaoptical.com