Flex coherent and open API bring a fresh, state-of-the-art software development approach to the broader community of network software developers. They will be able to fully and directly control and monitor the rich transport feature set optimized for SDN and cloud use cases.

1. Copyright©2018 NTT Corp. All Rights Reserved.
Coherent DSP meets
open transport SDN
Masahito Tomizawa
Hideki Nishizawa
NTT Network Innovation Laboratories
OFC2018 Market Watch Panel V

2. 1Copyright©2018 NTT Corp. All Rights Reserved.
Background: Optical Transport
for Data Center Interconnect is changing
• Traditional architecture
ROADM AMP AMP ROADM
Transponder
L2/L3switch
L2/L3switch
withoptics
ROADM AMP AMP ROADM
MUX
L2/L3switch
withoptics
DEMUX
MUX
Transponder
L2/L3switch
DEMUX
• Packet Optical Convergence
* Elastic Optical Networking in the Microsoft Cloud ( https://www.microsoft.com/en-us/research/wp-content/uploads/2016/07/JOCN_Microsoft_EONs_2016_published.pdf )
• Reasons this convergence is happening *
• Simpler architecture
• Client signals are predominated by Ethernet

3. 2Copyright©2018 NTT corp. All Rights Reserved.
Background 2: White-box trend appeared in OCP
✓ Already, L2/L3 switching box has become “white”.
✓ Everyone can make a box with available “open”
components.
Why do we not use “Optical Transport White box”?
Open Optical Packet Transport WG in TIP.
✓ Everyone can make a manager with available
“open source software (OSS)”.
✓ Switch manager (Microsoft SONiC)
✓ SDN orchestrator (NTT Ryu)
✓ Container Orchestration (Kubernetes)
✓ L2-SW from BRCM (Tomahawk, etc.)
✓ QSFP optical transceivers (intra-office)
✓ With SDK & open interface
Open NSL
Tomahawk

4. 3Copyright©2018 NTT corp. All Rights Reserved.
White-box packet transponder appeared in TIP
• The designs of white-box packet transponder have already
contributed to TIP are Voyager and Cassini.
ACO line card (Designed by NTT Electronics)
CFP2-ACO
200G Coherent DSP
(ExaSPEED 200)
*Edgecore Networks press release: https://www.edge-
core.com/news-inquiry.php?cls=1&id=258
Voyager (Designed by Facebook)
Cassini (Designed by Edgecore Networks)

5. 4Copyright©2018 NTT Corp. All Rights Reserved.
AS8700-24X
Coherent
Optical Module
Coherent
Optical Module
Tomahawk+
White-box Packet Transponder “Cassini”
• 16 x 100 Gbit/s QSFP28 ports and 8 x 200 Gbit/s Coherent Optical
Modules; first version comes with NTT Electronics ExaSPEED 200
Coherent DSP in modular design with max 8 modules
• 1.5 RU 19” rack mountable
AS7716-24XC
Coherent
Optical Module
Coherent
Optical Module
QSFP28 port
• First version comes with Broadcom
Tomahawk+ ASIC (3.2 T throughput)
• Redundant 60 mm (3+1) FAN
• Redundant Power (1+1 PSU)
CFP2-ACO
200G Coherent DSP
(ExaSPEED 200)Champion one,
Finisar, FOC,
Lumentum,
Oclaro, etc.

6. 5Copyright©2018 NTT corp. All Rights Reserved.
Open Transport
Manager
Real time OS
Transport Chassis
: Vender Proprietary
Architecture for “Open Transport”
Line
card
Card API
Open H/WFPGA FPGA
DSP DSP
Switch
ASIC
X86
Open Kernel
Switch SDK Transport SDK
SAI TAI
Open Switch
Manager
Transport Manager
SDN
Controller
: Open S/W H/W
North API North API
South API
Netconf/Yang
Open
Controller
Any
Missing parts
South API
• Supporting OSS: Server based architecture,
Flexible integration with applications like
container orchestration
• Open Transport API: Device accessible
Conventional Transponder White-Box Packet Transponder
2)
1)
Differentiation of vendors will be, for example,
1) Customization and support on network operations
2) Optimization of transport capability
(Line side)

7. 6Copyright©2018 NTT Corp. All Rights Reserved.
Feasibility study with Chunghwa Telecom
SW
SW SW
SW
SW
80-150 km
SDN Controller
Control Link
Optical Link
• Use case
• Datacenter Interconnect: 80-150 km, Ethernet Service, Multiple P2P
connections
• Evaluation items
1. Basic performance evaluation
2. Optical module multi-vendor capability
3. Total (L3/L2/Optical) configuration with a centralized SDN controller
4. Network topology flexibility
Example topology and architecture for field trial
Supporters (November 2017 onwards)
• Ascendtek Electronics/Oclaro
• Edgecore Networks
• Finisar
• Fujitsu Optical Components
• FOCI

8. 7Copyright©2018 NTT Corp. All Rights Reserved.
Reference: WDM transmission testing
Cassini_1 Cassini_2
Filter
ATT
Booster30MUX
170 km
Filter
30DMUXPre
CFP2
ACO
Tx Rx
CFP2
ACO
Tx Rx
ATT
3dB
8 dB
Chunghwa Telecom laboratory in Taiwan
Cassini_1 Cassini_2
100 km
CFP2
ACO
CFP2
ACO
• We have confirmed no packet loss and multi-vendor capability with
Cassini and CFP2-ACO at Taiwan laboratory and Japan laboratory.
• 200 Gbit/s 16QAM
• 100 km standard optical fiber without amplifier
• 170 km standard optical fiber without intermediate amplifier

9. 8Copyright©2018 NTT Corp. All Rights Reserved.
Feasibility study with NTT America
Supporter (January 2018 onwards)
• Champion One
• Fujitsu Optical Components
• Use case
• 10G/200G DWDM network for L3-based network
• Evaluation items
1. Basic performance evaluation
2. Optical module multi-vendor capability
3. Software for configuration/maintenance (Open API’s netconf/yang)
4. Monitoring function (OSNR/power/etc. open format)
OCP Summit 2018: March 21st 1:00pm-1:30pm
“Open Optical Packet Transponder Leveraging OCP Networking Technology”
Speaker: Michael Long, Network Development, NTT America

10. 9Copyright©2018 NTT corp. All Rights Reserved.
More software configurable by new DSP
Higher Multi-Level Modulation
100G
200G
300G
400G
500G
600G
QPSK 64QAM32QAM16QAM8QAM
65 Gbaud
32 Gbaud
4
bit/symbol
6
bit/symbol
8
bit/symbol
10
bit/symbol
12
bit/symbol
ClientCapacity(Gbit/s)
250G
150G
HigherBaudrate
FinerGranularity
Application
10000 km 1000 km 100 km
ULH/LH Metro DCI
Reconfigurable
TERA DSP

11. 10Copyright©2018 NTT corp. All Rights Reserved.
Next Gen DSP: works as expected.
TERA DSP works as expected.
Actual performance matches well that of simulation.
65 GBaud 16QAM = 400 Gbit/s65 GBaud 64QAM = 600 Gbit/s
This work was partly supported by “The research and development project for the
Tera-bit optical network technologies towards big data era” of the Ministry of Internal
Affairs and Communications, Japan.

12. 11Copyright©2018 NTT Corp. All Rights Reserved.
More Software configurable by flex coherent
1.2 Tbit/s DCO card
TERA DSP
• Flex coherent and open API bring a fresh, state-of-the-art software development
approach to the broader community of network software developers.
• They will be able to fully and directly control and monitor the rich transport feature set
optimized for SDN and cloud use cases.