OM4?OM4?Thomas Ko, RCDDProduct Manager

/Tyco Electronics / AMP NetConnect

What is OM4?

• Multimode Optical FiberMultimode Optical Fiber

• 850‐nm laser‐optimised, 50‐um core diameter/125 um cladding diameter gradeddiameter/125‐um cladding diameter graded‐index multimode optical fibers of OM4 performanceperformance

• Standard compliance– TIA‐492AAAD

– IEC 60793‐2‐10, Tyoe A1a.3

Types of Optical Fibre

SinglemodeCore = 9 umCladding 125 m

Multi-ModeCore = 50 umCladding 125 m

Multi-ModeCore = 62.5 umCladding 125 m Core

Cladding125 umCoating

Cladding = 125 umBuffer = 250 umNumerical Aperture = 0.13

OS1 / OS2

Cladding = 125 umBuffer = 250 umNumerical Aperture = 0.20

OM2 / OM3 / OM4

Cladding = 125 umBuffer = 250 umNumerical Aperture = 0.28

OM1250 um, 400 um or 900 um

OS1 / OS2 OM2 / OM3 / OM4OM1

Types of Optical FibreDispersion

RI ProfileX-View

Light Signal Received Signal

DispersionMultimode Step Index

Multimode Graded Index

Light Signal Received Signal

R i d Si lLaser Signal

Received Signal

Singlemode Step Index

DMD and BW

• Differential Mode Delay (modal dispersion) affects bandwidth

• “New” multimode fiber optimises mode delay

Ref

ract

ive

Inde

x

Profile

Light Sources

LED

VCSEL

• The transmitter– VCSEL (Vertical Cavity Surface Emitting Laser). A VCSEL laser light 

source emits at the 850 nm wavelength and it is capable of a high data rate.

– The LED emits light relatively uniformly over the entire face of the– The LED emits light relatively uniformly over the entire face of the multimode fiber core. 

Multimode Fiber Types and StandardsStandards

OMx/OSx designations relate to optical fiberOMx/OSx designations relate to optical fiber performance in cable form.

• ISO/IEC JTC 1/SC 25/WG 3 specify the “type” of optical fiber to be used in these cabled constructions by use of the relevant designations in IEC 60793‐2‐10 and IEC 60793‐2‐50.

ISO/IEC JTC 1/SC 25 Standard

• Standard Activity yISO/IEC 11801 2nd Edition 2002, Amendment 2 (2010) 

– Six cabled optical fibre Categories are specified to support i l f li tivarious classes of applications. 

– Four multimode CategoriesFour multimode Categories

• OM1, OM2, OM3 and OM4new !

– Two singlemode Categories

• OS1 and OS2 new !

Where?

• Where do you most likely use OM4?Where do you most likely use OM4?

DATA CENTERS

Fiber in Data Center

40 Gb/s and 100 Gb/s Ethernet Drivers

Bandwidth demand is growing in every market segment – from consumer, to 

t i t i d t t id

LAN Bandwidth Growth Drivers

• Data Centers proliferations

enterprise, to service and content providers

– HPC and SAN

WAN Bandwidth Growth Drivers

• Internet video traffics

– IP‐TV, Digital HD‐TV 

– Mobile video

P2P video– P2P video

• Online gaming

• Video conference, Source:

• Tele‐Medicine, Tele‐Learning

Data Center ArchitecturesData Center Architectures

Core

Internet peering (submarine telecom) / “entrance room” telephony

Core

Aggregation

A

Access

Server Farms

Server Clusters

Edge

A B

Core

Storage/Tape Farms

Why OM4 in DC?

• Designed for low cost 850nm Vertical CavityDesigned for low cost 850nm Vertical Cavity Surface Emitting Laser (VCSEL) transceivers

• OM4 provide extended reach beyond the• OM4 provide extended reach beyond the rated length, more connections and greater power marginspower margins.

• Applications include 10/40/100 Gigabit E h Fib Ch l I fi iB dEthernet, Fibre Channel, InfiniBand

x86 Servers by Connection Speed

30Source: Intel & Broadcom (April 2007)

x86 Servers by Connection Speed

20

25

units

10

15

illio

ns s

erve

r

0

5

mi

0

2000

2001

2002

2003

2004

2005

2006

2007

2008

2009

2010

2011

2012

2013

2014

2015

2016

2017

2018

2019

2020

100M 1G 10G 40G 100G

10 year transition for 1G Ethernet 6 years for 10GBE 5 years for 40GBE

IEEE 802.3 Standard ActivityP802 3ba Task Force TimelineP802.3ba Task Force Timeline

• IEEE 802 3 Higher Speed Study Group (2006)• IEEE 802.3 Higher Speed Study Group (2006)– IEEE P802.3ba Task Force (Jan 2008)

• 40Gbps and 100Gbps Ethernet• 40Gbps and 100Gbps Ethernet

Rectified June-2010

Updated IEEE 802.3ba Objectives

Operating Range

• The OM4 fiber was developed to allowThe OM4 fiber was developed to allow connections in excess of 100 meters for 40G/100G applications40G/100G applications.

150150 meters

Optical Fiber Considerations

Fiber is not dominant in short distance Client toFiber is not dominant in short distance Client to Access links, but 

Access to Distribution and Distribution to CoreAccess to Distribution and Distribution to Core links are fiber!

98% ~95%>98% ~95%

10‐100 Gb/s Optical Modules Reach (meters)Reach (meters)

IEEE 802.3baShort Reach SpecificationShort Reach Specification

• 40GBASE‐SR4 based on 850nm VSCEL• 4 lanes x 10Gbps Multiple Fiber Parallel Systems• Require 4 fibers for transmit plus 4 fibers for receive • Up to 100m with OM3 

– Max. Channel insertion loss of 1.9dBd l l ll f d– Connector and splice loss allocation of 1.5dB

0112

• Up to 150m with OM4– Max. Channel 

insertion loss of 1.5dB

– Connectors and splice loss allocation

10GB/s lane

1201

splice loss allocation of 1.0dB

10GB/s laneNot used

IEEE 802.3baShort Reach SpecificationShort Reach Specification

• 100GBASE‐SR10 based on 850nm VSCEL• 10 lanes x 10Gbps Multiple Fiber Parallel Systems• Require 10 fibers for transmit plus 10 fibers for receive • Up to 100m with OM3 

h l l f d

0124

– Max. Channel insertion loss of 1.9dB– Connector and splice loss allocation of 1.5dB

• Up to 150m with OM4– Max ChannelMax. Channel 

insertion loss of 1.5dB

– Connectors and 

240110GB/s lane

splice loss allocation of 1.0dB

10GB/s lane10GB/s laneNot used

IEEE 802.3ba40GBASE SR4 & 100GBASE SR1040GBASE‐SR4 & 100GBASE‐SR10 

IEEE 802.3ba

• Multimode solutions will be parallel 40GbMultimode solutions will be parallel

– 4 TX and 4 RX for 40G

– 10 TX and 10 RX for 100G

40Gbps

• 3 Options for 100G Tx

Rx

– 1 MPO (preferred)

– 2 MPO top and bottom

2 MPO id b id

Rx 100Gbps

– 2 MPO side by side

– All use the 10 center fibersTx

NOTE: all views are looking into transceiverTx Rx

NOTE: all views are looking into transceiver

MPO Connector(Multi fiber Push On)(Multi‐fiber Push On)

• Internationally, the MPO is defined by IEC‐61754‐7. 

• In the USA, the MPO is defined by TIA‐604‐5 (also called FOCIS 5). 

• In the data center, the MPO is defined by ISO/IEC 24764‐1.

• Rectangular MT ferrule support each row of 12 fibers up to max of 72Rectangular MT ferrule support each row of 12 fibers up to max of 72 fibers

• Typically terminated with a flat ribbon cable6 4mm

2.45mm

6.4mm

MT Ferrule

MPO Connectors2.45mm

MPO Cabling Solution in DC

Considerations favoring MPO fiber solution

Hi h f d i d i h f• High performance and pre‐terminated in the factory.

• Small form factor

– High‐density 

– Space saving in pathways and rack spaces (support better air flow)

• Modular connectivity (Plug‐n‐go concept)

– Easy ScalabilityEasy Scalability

– Short time to install, change, maintain, and recover

• Support existing applications

F t f f 40GBASE SR d 100GBASE SR• Future‐proof for 40GBASE‐SR and 100GBASE‐SR

System Cost Comparion

40G – Multimode vs Singlemodeg

Paul Kolesar, Commscope, “The Case for Extended Reach Multimode Objectives”IEEE 802.3ba, September 2008

System Cost Comparion

100G – Multimode vs Singlemodeg

Paul Kolesar, Commscope, “The Case for Extended Reach Multimode Objectives”IEEE 802.3ba, September 2008

Power consumption

• Lower power consumption critical as linkLower power consumption critical as link density and speed increase– 10G SFP Fiber transceivers consume <1 watt– 10G SFP Fiber transceivers consume <1 watt

– 10GBASE‐T copper transceivers can consume 6 watts or morewatts or more

Savings: 5 watts on each gtransceiver + 5 watts on 

licooling

What’s Next

• Band insensitive Multimode Optical Fiber

• Active Optical Fiber Cables

• Convergence of NetworksConvergence of Networks – FCOE

– Infiniband– Infiniband

• Virtualisation

Bend Insensitive Fiber

• Singlemode BI cable availableSinglemode BI cable available

• New development in Multimode fiberB tt b di f th t d d 50– Better bending performance than standard 50um fiber

Improved optical reliability under tightly bent– Improved optical reliability under tightly bent conditions

Bend radius down to 7 5mm (vs 15mm)– Bend radius down to 7.5mm (vs 15mm)• 0.2dB added loss @ 850nm with 2 turns

• 0.5dB added loss @ 1300nm with 2 turns0.5dB added loss @ 1300nm with 2 turns

PARALIGHT Active Optical Cable AssembliesAssemblies

• No Equipment UpgradesNo Equipment Upgrades • Functions like a Standard Electrical Cable• 200 Meters Plus Reach• Low Latency• No EMI• Hot Pluggable• Optical Cable Advantages

/• 1/3 Size of Copper Cable• 3.0 mm O.D. Round

• 1/3 Weight of Copper Cable• Flexible in All Directions• Flexible in All Directions• Ease of Cable Management• Increased Air Flow

Data Center Networking Fabrics

Users

NAS

LANApplications

switch

bl k t adapterswitch

LANEthernet

networking adapter

Applications

SANBlock StorageFibre Channel

block storage adapter

clustering adapterswitch

ClusteringInfiniBand,

Myrinet, Quadrics,etc.

Single Adapter for All TrafficConverged Fabric for Networking, Storage, and Clusteringg g, g , g

Users• Smaller footprint• Lower complexity• Higher bandwidthHigher bandwidth• Lower power• Lower heat dissipation NAS

s itcht ki

Applications

ConvergedEthernet SAN

switchnetworkingstorageclustering

adapter

Trends ‐ Servers Virtualization

• Server virtualization is the logical partitioning of the physical resource into multiple virtual servers

Virtual Servers

the physical resource into multiple virtual servers.• Use software to transform, or “virtualize” the 

hardware resources of a server – including the CPU, RAM, hard disk and network controller. VirtualizationCPU, RAM, hard disk and network controller.

• Each functional virtual machine runs their own operating systems and applications.

• This reduces the amount of hardware, power, cabling, cooling and real estate space, which in turn reduces OpEx and CapEx.

• Expect much higher traffics at the physical server IO– Requires higher throughput NICs– Requires faster network speed

R i hi h b d idth bli

Physical Resource

– Requires high bandwidth cabling

Emergence of Virtualization

25 Non Virtualized

15

20

Non VirtualizedVirtualized 70% of servers

will be virtual by 2014

5

10

15

0

5

2007 2008 2009 2010 2011 2012 2013 2014I t St t d C bli• Virtualisation requires network traffic infrastructure and will drive up number of trunks, higher data speeds• With virtualisation it gets even harder to tell what is connected to what. Mapping the logical to the physical

becomes more important, in order to trace faults• Cable Patching becomes less important – you do not need to patch in a new server when one dies

Impact on Structured Cabling

• Structured DC Cabling could be replaced by wiring harnesses, because you only need to ‘wire it once’

Fiber Choices100000

40000

OM

OM

10000

OM3 Single-mode FiberOM4

40000 M3

M4

OM3

1000

Single-mode FiberOM4

dth

OM3

100

Ban

dwi OM3

300 600 2000

50µm Multimode Fiber10

100082Distance (m)

300 600 2000

Selection based on lowest cost electronics

82

Summary

• High Density Optical Cabling is mandatory inHigh Density Optical  Cabling is mandatory in Data Centers

• Network speed will only go faster NOT slower• Network speed will only go faster NOT slower

• However fast your enterprise moves toward hi h d h l i OM4 ill h lhigh speed technologies, OM4 will help you maximize the life of your structured cabling system

Thank You