This slide deck presents a user case by Microsoft (Mark Filer) for a 100G DWDM alternative to Coherent systems <80km using the PAM-4 approach. Fujitsu (Muhammed Sarwar) and Finisar (Gert Sarlet) present the case for Coherent. Inphi (Radha Nagarajan) and ADVA (Joerg-Peter Elbers) present the case for the PAM-4 approach. IEEE (John D'Ambrosia) weighs in from the standards perspective.
1. LINE SIDE 100 Gb/s DWDM
NETWORK SOLUTIONS –
DEBATING THE OPTIONS
Moderators
Larry Johnson – Founder- FiberStory
Tim Yount – Co-founder- Fiber Insight
Richard Ednay – Technical Dir - Optical Technology Training
OFC 2019 – San Diego, CA
www.fiber-story.com
www.fiberinsight.com
www.ott.co.uk
35. Jörg-Peter Elbers
OFC Panel: Line Side 100Gb/s DWDM Network Solutions – Debating the Options
for the data center interconnect?
Coherent or direct-detect
36. 32
Data centers require high-capacity interconnects
DC
Spine
switch
DWDM
Transponder
DC
Edge
router
Core OLS
Customer
Traffic
DCI OLS
It is good to have a choice – open line system & 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
37. 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
• 100Gb/s available today
• Needs optical dispersion compensation
Direct detectCoherent
How to manage dispersion for direct detect?
DWDM line-side options for DCI applications
DWDM
QSFP28CFP2-DCO
DWDM terminal with
on-board optics
38. 34
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
39. 35
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
5
10
15
20
25
30
35
40
45
600G Coh. 200G Coh. 100G Coh. 100G PAM4
C-bandcapacity(Tb/s)
Modulation format
CFP2-DCO
DWDM
QSFP28
DWDM terminal with
on-board optics
40. 36
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
42. HUAWEI TECHNOLOGIES CO., LTD.
Line Side 100Gb/s DWDM Network
Solutions – Debating the Options
Introducing IEEE P802.3ct
100 Gb/s and 400 Gb/s over DWDM Systems
John D’Ambrosia
March 7, 2019
43. HUAWEI TECHNOLOGIES CO., LTD.
Regarding the Views Expressed
My Industry Involvement
Acting Chair, IEEE P802.3ct, 100 GbE and 400GbE over DWDM Systems Task Force
Chair, IEEE P802.3cn 50 GbE, 200 GbE, 400GbE SMF Task Force
Chair, IEEE 802.3 New Ethernet Applications (NEA) Ad Hoc
Recording Secretary, IEEE 802 Executive Committee
Chairman, Ethernet Alliance Board of Directors
Senior Principal Engineer, IP Standards Team North America, Futurewei
The views being presented in this educational material on the respective IEEE 802.3
standards under consideration are the views of the author(s), and do NOT represent a
formal position or interpretation of the respective standard by The Ethernet
Alliance. This document is provided on an “AS IS,” “AS AVAILABLE,” and “WITH ALL
FAULTS” basis, with no representations or warranties whatsoever, whether express,
implied, statutory, at common law, or otherwise.
Per IEEE-SA Standards Board Bylaws, Dec 2016
“At lectures, symposia, seminars, or educational courses, an individual presenting
information on IEEE standards shall make it clear that his or her views should be
considered the personal views of that individual rather than the formal position of
IEEE. ”
45. HUAWEI TECHNOLOGIES CO., LTD.
Introducing IEEE P802.3ct
100 Gb/s and 400 Gb/s over DWDM Systems
Task Force Webpage - http://www.ieee802.org/3/ct/index.html
Key Application Drivers:
Cable MSO Distribution Networks
Mobil Backhaul Networks
Data Center Interconnect
Key Objectives (Full objectives - http://www.ieee802.org/3/ct/3ct_Objectives_190212.pdf)
For 100 Gb/s Ethernet - Provide a physical layer specification supporting 100 Gb/s
operation on a single wavelength capable of at least 80 km over a DWDM system.
For 400 Gb/s Ethernet - Provide a physical layer specification supporting 400 Gb/s
operation on a single wavelength capable of at least 80 km over a DWDM system.
Adopted Timeline Completion – Sept 2021
47. HUAWEI TECHNOLOGIES CO., LTD.
Key Decisions to Date
100 GbE 400 GbE
Channel Model Straw poll support for ITU-T Black Link Approach
# of Channels No decision yet
Channel Spacing Straw poll support for 100 GHz
Modulation Format DP-DQPSK DP-16QAM
Frame Assumption GMP Mapping
ITU-T G.709 Clause 17.7.5
Based on OIF 400ZR
FEC “Staircase” (255, 239)
Hard Decision
ITU-T G.709.2 Annex A
CFEC
Tx Metric No decision yet