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ETHERNET FIBER OPTIC CABLING TRENDSDoug Coleman, Corning
Moderator
OFC 2016
March 23, 2016
Ethernet Fiber Optic Cabling Trends
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• Opinions expressed during this presentation are the views of the presenters, and should not be considered the views or positions of the Ethernet Alliance.
Ethernet Fiber Optic Cabling Trends
• Moderator
– Doug Coleman, Manager of Technology and Standards, Corning
• Data Center Channel Lengths 2013-2015
• Panelists
– Paul Kolesar, Engineering Fellow, CommScope
• WBMMF & SWDM
– Brett Lane, Director of Technology, Panduit
• Structured Cabling
– Greg McSorley, Technical Business Development Manager, Amphenol
• Lower Cost TOR interconnect
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ETHERNET FIBER OPTIC CABLING TRENDS: DATA CENTER CHANNEL LENGTHS 2013-2015Doug Coleman, Corning Incorporated
OFC 2016
March 23, 2016
OM3 Channel Length
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Source: Corning
OM4 Channel Length
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Source: Corning
SMF Channel Length - Enterprise
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Source: Corning
SMF Channel Length - Hyperscale
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Source: Corning
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ETHERNET FIBER OPTIC CABLING TRENDS: WBMMF & SWDM
Paul Kolesar – CommScope, Chair TIA TR-42.11
OFC 2016
March 23, 2016
Background
• Lane rates up to 28Gbps standardized over MMF
– 32GFC (28G), 100GBASE-SR4 (4x25G), P802.3bs (16x25G), P802.3by (25G)
• Alternative technologies supplement lane rate increases
– Spatial muxing, WDM, higher-order modulation, bi-di transmission
• WDM technology is gaining momentum
– Transceiver manufacturers releasing devices employing short-wave division multiplexing (SWDM) for 40G and 100G applications
– SWDM Alliance formed with eleven member companies
– Fiber manufacturers optimizing properties of MMF to suit
– New standard for WideBand Multimode Fiber (WBMMF) nearing completion…
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WBMMF Standardization Background• TIA TR-42 WBMMF project
– Supported by fiber, transceiver and system companies
– International participation from IEC 86A members
– TIA-492AAAE publication anticipated June 2016
• TIA structured cabling standard revision
– TIA-568.3-D publication anticipated June 2016
– Added cable with TIA-492AAAE fiber as recommended media
• IEC 86A WBMMF project
– Planned initiation April 2016
• ISO structured cabling standard revision
– Draft 11801 ed.3 added WBMMF cable, contingent on IEC spec maturity
• For Fibre Channel and Ethernet
– 128GFC Gen 2, 256GFC, … and 100GE, 200GE, 400GE, …
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Benefits of SWDM and WBMMF• Wavelengths used to reduce number of fibers
– Good trend for improving MMF utility
– SWDM utility is more limited on OM3 or OM4 at high lane rates
• Deliver sufficient bandwidth over wavelength spectrum – to support > 100G per fiber to at least 100 m
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Goals and benefits: retain legacy application support of OM4 increase capacity to > 100G per fiber reduce parallel fiber count by factor of 4 boost array cabling capacity for parallel apps enable Ethernet:
40G-SR, 100G-SR, 200G-SR, 400G-SR4 enable Fibre Channel:
128GFC-SWDM, 256GFC-SWDM extend MMF utility as universal medium
Application Evolution Map
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parallel fiber transmission
WDM transmission
WDM + parallel transmission
Legend
4λ WDM enablingfactor of 4 fiber count
reduction
*Parallel fibers remain essential to support break-out functionality
Data Rate
10GNRZ
ParallelTX RX
25GNRZ
ParallelTX RX
50G PAM4
ParallelTX RX
10, 25, 50G WDM & ParallelTX RX
N/AN/A40G
100G
400G
200G
Imagine running 10G, 40G, 100G, 200G
over the same WBMMF cable plant using duplex LC connections *
WBMMF Spec Framework
• Wavelength range is central to WBMMF specification– although WBMMF standard does not specifically set WDM plan
• What is clear from the outset:– Legacy application support dictates inclusion of 850 nm wavelength
– Move towards longer wavelengths to gain improvements from lower chromatic dispersion, lower attenuation, faster VCSELs
– Four wavelength bands are ideal complement to four-lane parallel
• Transceiver vendors say low-cost WDM needs ≥ 30 nm pitch– Accommodates low-cost manufacturing tolerances, temperature variation,
spectral width, low-complexity filters
• TIA TR-42 put this all together to determine– shortest wavelength and wavelength range
– required fiber bandwidth across spectrum by applying Ethernet and Fibre Channel transmission models
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Bandwidth-Wavelength Relationships
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0
1,000
2,000
3,000
4,000
5,000
750 775 800 825 850 875 900 925 950
Ban
dw
idth
(M
Hz·k
m)
Wavelength (nm)
Worst-case OM4 total bandwidth analysis
Modal BW
Chromatic BW (0.6nm)
Total Bandwidth
Basic Requirements & Indications
Must retain legacy 850 nm application support.
Wavelengths > 850 nm benefit fromincreasing chromatic bandwidth and improving VCSEL capability.
Must support at least 4 wavelengths.
Low-cost WDM needs ~30 nm spacing.
Resulting target wavelength region: ~840 nm to ~950 nm
Bandwidth improvement is needed to raise total bandwidth to that at ~840 nm
over target wavelength region.
Transmission Performance at 100 m
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*
* 980nm VCSELs readily available for transmission tests and extract near-worst-case bandwidth effects.
Compare the left plot at 850 nm to the right plot at 980 nm, noting their different x-axis scales. Notice how the lines for the two OM4 fibers move significantly up and to the right, indicating that transmission impairments have substantially increased at 980 nm for OM4. But the two WBMMFs plotted in red remain comparatively similar at 980 nm to their 850 nm performance showing their ability to well support a very useful range of wavelengths.
Demo at OFC 2015
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• 4λ, each at 25.78 Gb/s– Finisar SWDM concept transceiver (4 SFPs mu’xed together)– Nominal 850, 880, 910, 940 nm wavelengths– WBMMF meeting TIA-492AAAE specification– > 100 Gb/s over single-fiber channel– 225 m reach (50 m + 75 m + 100 m spools) – Error-free without FEC assistance– Enabling FEC would have permitted longer reach
Additional Demos
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Las Vegas, USASeptember 2015
40G over 500m 100G over 300m
Fall BICSI
Valencia, SpainSeptember 2015
Dubai, UAEOctober 2015
ECOC
GITEX
100G over 300m
Fully integrated FinisarWDM transceivers in all demos
Go to OFS booth to see live
Summary
• The industry is moving to utilize SWDM– Transceivers, fibers, cabling
• WBMMF will optimize the reach of SWDM solutions– While retaining support for 850 nm legacy applications at OM4 reaches
• Applications provide opportunities to seed these technologies– Ethernet and Fibre Channel
• SWDM & WB technologies extend the utility of MMF– Continuing legacy of delivering lowest-cost optical solutions
over the universal data-comm transmission medium that is MMF
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Thank You
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ETHERNET FIBER OPTIC CABLING TRENDS: STRUCTURED CABLING
Brett Lane – Director of Technology, Panduit
OFC 2016
March 23, 2016
… & while we’d all welcome it if everybody appreciated structured cabling…
• In a maturing market, the focus is even greater…
– Business Problems: Maximize RoA and Maintain Compliance (& security)
– Opportunities:• Small
• Agile
• High Performance
• Cost Efficient
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• Reliable
• Energy Efficient
• Meets Code
Structured Cabling & Business Problems
Architectures…
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• Multinational Financial Institution– Regional DC
• ~ 2500 SF of White Space – Raised Floor
• Tier 3• Hot/cold aisle configuration• ~100 total cabinets
– ~2000 servers on Day 1
• Per Cabinet Power consumption~8kW (20kW)
• Heterogeneous Storage and Compute Equipment
Small
Reliable
High Performance
Cost Efficient
Meets Code
Agile
Structured Cabling• Cabling…
– Server, Intra, Adjacent-Rack Connections
• Copper media & connectivity continue to shine
– More Later!
– Switch, Inter-Rack Connections
• Single-mode Fiber (SMF) and connectivity
• Multimode Fiber (MMF) and connectivity
– Relaxed opto-mechanical tolerances
• What market segment?
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Source: BSRIA Global Data Centre 2014 End-User Survey, Jan 2015
MMF Application Roadmap
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Source: http://www.ethernetalliance.org/roadmap/
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Application10GBASE-
SR
25GBASE-
SR
40GBASE-
SR4
100GBASE-
SR10
100GBASE-
SR4
Data Rate 10 Gbps 25 Gbps 40 Gbps 100 Gbps 100 Gbps
IEEE Std 802.3ae 802.3by 802.3ba 802.3ba 802.3bm
Form Factor SFP+ SFP+ QSFP+ CFP, CXP QSFP28, CFP4
Fiber Type OM3/4 OM3/4 OM3/4 OM3/4 OM3/4
Reach* 300/400m 70/100m 100/150m 100/150m 70/100m
# of Fibers 2 2 12 (8 used) 24 (20 used) 12 (8 used)
Connectors
Duplex LC Duplex LC 12f MPO 24f MPO (2 x 12) 12f MPO
Schematic
4 x 25 4 x 254 x 10 4 x 10 10 x 10 10 x 101 x 10 1 x 10 1 x 25 1 x 25
MMF Application& Component Roadmap
50GBASE-
SR
50 Gbps
802.3
SFP28
OM3/4
70/100m
2
LC Duplex
1 x 50 1 x 50
100GBASE-
SR2
100 Gbps
802.3
SFP28
OM3/4
70/100m
12 (4 used)
12f MPO
2 x 50 2 x 50
200GBASE-
SR4
200 Gbps
802.3
QSFP28
OM3/4
70/100m
12 (8 used)
12f MPO
4 x 50 4 x 50
Technology Cornerstones
– Form Factor: SFP, QSFP
– Laser-Optimized MMF
• SMF
– Single & Multi-fiber (MPO)
– Higher Speed Modulation
• OOK
• PAM4, etc
– Spatial Multiplexing (Parallel Optics)
– Wavelength Multiplexing
• Bi-Directional
• SWDM
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While Fiber Cabling km rises slowly…
CRU-2014
1
10
100
1000
2013 2014 2015 2016 2017 2018
M$
MMF LC
MMF MPO
& the CAGR of MPO is roughly 2x of LC
And more on the technology a little bit later…
InfrastructureCornerstone Components
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Structured Cabling Solves Business Problems
• Small– More space for active gear
– Energy Efficient
• Agile– Reconfigurable
– Data rate migration
– Breakout (e.g. 4 x 1)
• High Performance– Data rate migration
– Reliable
– Operable
Fiber Cabling Systems& Business Problems
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ETHERNET FIBER OPTIC CABLING TRENDS: LOWER COST TOR INTERCONNECTGreg McSorley, Amphenol Corp.
OFC 2016
March 23, 2016
TOR need affordable solutions
• Growing need for TOR lower cost solutions
– Data Center’s are getting larger, costs growing
– Most link length's less than 30m and many of those are under 3m
– Lower power per interconnect saves overall power consumption
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Simple TOR Configuration
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Worst case length4’ across7’ down2’ across2’ to backTotal 5.1m
Cost Example
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40Gb, QSFP, 5mDAC $ XAOC $ 2.8XTransceivers $ 7.2X(2 transceivers + LC fiber jumper)
100Gb, QSFP, 5mDAC $ XAOC $ 2XTransceivers $ 8.5X(2 transceivers + MPO Fiber Jumper)
AOC DAC2 Transceivers and
fiber
Cost Example, Breakout Cables
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40Gb, QSFP, 5m SplitterDAC $ XAOC $ 1.5XTransceivers $ 3.6X(1 QSFP + 4SFP transceivers + MPO to 4 LC fiber jumper)
100Gb, QSFP, 5m SplitterDAC $ XAOC $ 1.2XTransceivers $ 5.8X(1 QSFP + 4SFP transceivers + MPO to 4 LC fiber jumper)
AOC DAC5 Transceivers and fiber interconnect
Advantages
• For TOR designs, DAC attach and AOC’s offer a significant cost savings
– One cable vs 2 transceivers, plus jumper cable
– Single part number for each interconnect
– Ease of configurations and reconfiguring
– No cleaning of the optic interface
– Less Expensive
– Less system power required
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Q & A
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