Learn about Wide Band Multimode Fiber (WBMMF) -- the application drivers, multiplexing technology, parallel fiber transmission, and Short Wavelength Wave Division Multiplexing. This presentation will also review the cabling evolution roadmap and the WBMMF specification framework.

1. The Next Generation Multimode Fiber:
Wide Band MMF (WBMMF)
Paul Kolesar
Engineering Fellow
Chair TIA TR-42.11
CommScope
August 20, 2015
TIA Fiber Optics Technology Consortium 1
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company or provider

2. Fiber Optics Tech Consortium
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• 3M
• AFL/Noyes Fiber Systems
• CommScope
• Corning
• EXFO
• Fluke Networks
• General Cable
• JDSU
• Legrand/Ortronics
• OFS
• Panduit
• Sumitomo Electric
Lightwave
• Superior Essex
• The Siemon Company
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5. Important Notice
Any product(s) identified or identifiable via a trade name or
otherwise in this presentation as a product(s) supplied by a
particular supplier(s) is provided for the convenience of users of
this presentation and does not constitute an endorsement of any
kind by TIA of the product(s) named. This information may be
provided as an example of suitable product(s) available
commercially. Equivalent product(s) may be used if they can be
shown to lead to the same results.
TIA Fiber Optics Technology Consortium 5

6. Outline
• Application drivers
• Multiplexing technology overview
• Trends in time division multiplexing
• Trends in space division multiplexing (a.k.a. parallel fibers)
• Trends in short-wavelength division multiplexing
• Benefits of SWDM and WBMMF
• Cabling evolution roadmap examples
• Bandwidth-wavelength relationships
• Wavelength usage refinement
• Bandwidth and transmission performance data
• OFC 2015 demo
• Standardization
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7. Applications Drivers
• continues to evolve
– Existing:
10M, 100M, 1G, 10G
40G, 100G
– Developing:
2.5G, 5G, 25G, 400G
– Near future interest:
50G, 200G
– On and over the horizon:
800G, 1.6T
• and thrive
– due to unrelenting
demand for services
needing faster data rates:
video streaming, on-line
gaming, smart phone
apps, music streaming,
photo messaging, …
Ethernet Roadmap 2015 – courtesy of Ethernet Alliance
Ethernet
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8. Multiplexing Technology Overview
Wavelength Division Multiplexing
(WDM)
MUX
4 4
3 3
2 2
1 1
Single Fiber (e.g. WBMMF)
DEMUX
Space Division Multiplexing (SDM)
(a.k.a. parallel fiber, parallel optics)
Four Conductors
e4
e3
e2
e1
e4
e3
e2
e1
MUX
DEMUX
Time Division Multiplexing (TDM)
Single Conductor
e4
e3
e2
e1
e4
e3
e2
e1
Orderofdeploymentinshort-reachopticalcommunicationssystems
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9. Trends in TDM
• Higher data rates typically defined using
– Parallel electrical sub-rate, sometimes serialized via SERDES (TDM
mux/demux) for delivery over fiber
– Serialize the electrical rate as technology
permits
– Example: 10G has 4-lane (quarter rate)
and serial electrical rates defined
• Today’s datacom max serial rates
– Ethernet = ~25 Gb/s
– Fibre Channel = ~28 Gb/s
• Emerging datacom max serial rates
– Ethernet = ~50 Gb/s
– Fibre Channel = ~56 Gb/s
MUX
DEMUX
Single Conductor
(e.g. fiber, circuit board)
e4
e3
e2
e1
e4
e3
e2
e1
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10. Trends in SDM
• Data rates above 28Gb/s (32GFC) employ parallel fibers
– 40GBASE-SR4
– 100GBASE-SR10 100GBASE-SR4
– 128GFC (will be like 100G-SR4)
– 400GBASE-SR16
• Transmission via parallel fibers has pragmatic limits
– 100GBASE-SR4 more practical than -SR10
– Diminished appeal above -SR16
– A better approach is needed to keep MMF solutions optimized
– Enter SWDM
Rx Rx Rx Rx Rx Rx Rx Rx Rx Rx Rx Rx Rx Rx Rx Rx
Tx Tx Tx Tx Tx Tx Tx Tx Tx Tx Tx Tx Tx Tx Tx Tx
400GE Optical Lanes in MPO-16
Four Fibers
e4
e3
e2
e1
e4
e3
e2
e1
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11. Trends in Short-Wave WDM (SWDM)
• Example - Cisco’s 40G-SR-BD
– 40G transmission on one pair of MMF
– Uses two wavelengths in opposite
directions per fiber, each at 20G
– Wavelength discrimination supports bi-directional operation
– Nominal wavelengths of 850 nm and 900 nm
– Four wavelengths
illustrated
WDM also supports uni-directional transmission per fiber
MUX
4 4
3 3
2 2
1 1
Single Fiber (e.g. WBMMF)
DEMUX
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12. Mu’xed Multiplexing
• Example – TDM + WDM
– Can also replicate over parallel fibers to combine TDM + WDM + SDM
MUX
Single Fiber
e1d
e1c
e1b
e1a
MUX
e2d
e2c
e2b
e2a
MUX
e3d
e3c
e3b
e3a
MUX
e4d
e4c
e4b
e4a
MUX
DEMUXDEMUXDEMUXDEMUX
DEMUX
e1 e1
e2
e3
e3
e2
e4e4
e1d
e1c
e1b
e1a
e2d
e2c
e2b
e2a
e3d
e3c
e3b
e3a
e4d
e4c
e4b
e4a
1 1
2
2
3
3
4
4
ASIC ASICOptical Tx Optical Rx
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13. Benefits of SWDM & 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 / fiber to at least 100 m
Goals and benefits:
 retain legacy application support of OM4
 increase capacity to > 100G per fiber
 reduce parallel fiber count by factor of 4
 enable Ethernet:
40G-SR, 100G-SR, 400G-SR4
 enable Fibre Channel:
128GFC-SWDM4, 256GFC-SWDM4
 extend MMF utility as universal medium
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14. Application Evolution Map –
Ethernet Examples
parallel fiber transmission
WDM transmission
WDM + parallel transmission
Legend
Data Rate 10G
Parallel
TX RX
25G
Parallel
TX RX
10G, 25G
WDM &
Parallel
TX RX
N/A
N/A
40G
100G
400G
SWDM enabling
factor of 4 fiber count
reduction
Imagine running
10G, 40G and 100G
over the same WBMMF cable plant
using duplex LC connections *
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*Parallel fibers remain essential to support break-out functionality

15. FC Rate 32GFC
Parallel
TX RX
64GFC
Parallel
TX RX
32G, 64G
WDM
TX RX
128GFC
256GFC
N/A
N/A
Application Evolution Map –
Fibre Channel Examples
Legend
SWDM enabling
factor of 4 fiber count
reduction
Imagine running
32G, 64G, 128G and 256G
over the same WBMMF cable plant
using duplex LC connections *
parallel fiber transmission
WDM transmission
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*Parallel fibers remain essential to support break-out functionality

16. WBMMF Specification Framework
• Wavelength range is central to WBMMF specification
– although WBMMF standard will 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
• The following analysis puts this all together
– to determine shortest wavelength and wavelength range
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17. 0
1,000
2,000
3,000
4,000
5,000
750 775 800 825 850 875 900 925 950
Bandwidth(MHz·km)
Wavelength (nm)
Worst-case OM4 total bandwidth analysis
Modal BW
Chromatic BW(0.6nm)
Total Bandwidth
Bandwidth-Wavelength Relationships
Basic Requirements & Indications
Must retain legacy 850 nm application
support.
Wavelengths > 850 nm benefit from
increasing 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.
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18. 840 850 860 870 880 890 900 910 920 930 940 950 960
λ1
λ2
λ3
λ4
guard guard guardpass pass pass pass
Wavelength
Refinement
• Calculate pass-band & guard-band allocations
– Support 4 WDM operating wavelengths
• Set λL1 (longest wavelength of first pass-band) = 860 nm, the legacy upper limit
 for best performance and to allow λ1 VCSEL use for legacy applications
• move towards longer wavelengths for other bands
– Account for spectral width & temperature shift in pass-band calculation
• λw allowance
 0.6 nm rms (widest in recent standards)
• VCSEL temperature coefficient and temperature range
 0.065 nm/⁰C coefficient
 account for 100 ⁰C variation
(supports -5 to 85 ⁰C ambient temperature range)
– Apply calculations as a function of wavelength
• VCSEL λc manufacturing tolerance allowance
 Percentage of nominal wavelength
 Trades-off with temp. coefficient, temp. range and spectral width
to fit within pass-band
• Filter pass-bands and guard-bands scaled with wavelength
 As requested by transceiver makers, provide ≥ 30 nm spacing
temp.
λw
pass-band allocations
λc
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19. Results
• Highlights
– Spectrum used equitably for all bands due to wavelength scaling
– Nominal wavelengths shifted up slightly from basic concepts
– Pitch between all nominal wavelengths > 30 nm
– Longest wavelength = 953.0 nm
– Shortest wavelength = 846.0 nm 107 nm range
840 850 860 870 880 890 900 910 920 930 940 950 960
Possible4 λ Plan
λ1
λ2
λ3
λ4
guard guard guardpass pass pass pass
name nominal VCSEL range pass-band guard-band
λ1 853.0 846.0 - 860.0 14.0
16.2
λ2 883.4 876.2 - 890.5 14.3
16.5
λ3 914.3 907.0 - 921.5 14.5
16.8
λ4 945.7 938.3 - 953.0 14.7
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20. Samples of Standard OM4
and Wide-Band MMFs
Fiber and measurements courtesy of OFS
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21. Transmission Test Configuration
BERT
FUTFUTFUT
VOA
RX
limiting amp
VCSELs:
λ A, λB, …
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22. *
Transmission Performance at 100 m
* 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.
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23. Demo at OFC 2015
• 4λ, each at 25.78 Gb/s
– Finisar SWDM concept transceiver (4 SFPs mu’xed together)
– OFS fiber meeting CommScope WBMMF 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
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24. WBMMF Standardization
• Initial presentations to TIA TR-42 October 2014
– Coauthored and supported by fiber, transceiver and system companies
• TIA TR-42 approved project
– October 2014, without dissent
– International participation from IEC 86A members
– Monthly meetings with several contributors, > 40 contributions
– First ballot authorized June 2015
– TIA-492AAAE anticipated 2016
• For Fibre Channel & Ethernet
– 128GFC Gen 2, 256GFC, …
– 100GE Gen 3, 200GE Gen 1, 400GE Gen 2, …
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25. 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
Thank You
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26. Q&A
Thank you for your time
To get your CEC, please email
liz@goldsmithpr.com
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27. Important Notice
Any product(s) identified or identifiable via a trade name or
otherwise in this presentation as a product(s) supplied by a
particular supplier(s) is provided for the convenience of users of
this presentation and does not constitute an endorsement of any
kind by TIA of the product(s) named. This information may be
provided as an example of suitable product(s) available
commercially. Equivalent product(s) may be used if they can be
shown to lead to the same results.
TIA Fiber Optics Technology Consortium 27