Insuring 40/100G Performance Multimode Fiber Bandwidth Testing & Array Solutions Kevin Paschal Sr. Product Manager Enterprise Fiber Solutions
Fiber Optics LAN Section Part of the Telecommunications Industry Association (www.tiaonline.org) Formed 16 years ago Mission: to educate users about the benefits of deploying fiber in customerowned networks FOLS provides vendor-neutral information www.fols.org 2
Fiber Optics LAN Section Current Members! ADC! AFL Telecommunications! Berk-Tek, a Nexans Company,! Corning Optical Fiber! CommScope! Draka Communications! Fluke Networks! OFS! Ortronics! Sumitomo Electric Lightwave! Tyco Electronics 3
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Multimode Fiber Bandwidth Testing Quick review of OM4 fiber and high data rate applications Differential mode delay (DMD) testing in the factory Array solutions for 40/100G Summary focusing on system performance
Standards Today are Focused on High Bandwidth Applications and Supporting Media TIA s OM4 standard published September 2009! TIA 492AAAD IEC OM4 standard published June 2010! IEC 60793-2-10 ed. 4 specs harmonized with TIA standard Fibre Channel specifies OM4 in FC-PI5 draft that defines 16GFC! 3rd ballot specifies OM4 to 150 m! FC-PI5 draft also specifies OM4 for 8GFC and 4GFC! Very limited loss budget allowed IEEE 802.3 included OM4 for 40GbE & 100GbE, published June 2010! OM3 to 100 m with 1.5 db connection loss allocation! OM4 to 150 m with 1.0 db connection loss allocation Pre-standard enhanced OM3 fiber may or may not be compliant to the OM4 standard
OM4 Optical Fiber Takes You Farther OM4 OM3 40 & 100 Gb/s 850 nm, 16GB FC 100! 150! OM1, OM2, and OM2+ not recognized! Only OM3, OM4, and SM are recognized to Ethernet speeds above 10G Low Loss Connectivity is required > 125 meters 10GE 850 nm, 10GFC, & OIF STM-64 1 Gb/s 850 nm Ethernet or FC OM4 50 um OM3 50 um OM2+ 50 um OM2 50 um OM1 62.5 um 0! 100! 200! 300! 400! 500! 600! 0 250 500 750 1000 Reach is too short for a practical 10 Gb/s network
40 & 100G Ethernet Standard IEEE802.3ba Published June 2010 BOTH 40 and 100G Rates MPO array connectivity Used today for high-density applications At least 10 km on Singlemode Also includes 40 km soln @ 100G SM employs WDM 100 meters minimum with OM3 Not listed: OM1, OM2, and OM2+ MM employs Parallel Optics 150 meters with OM4 Low Loss Connectivity Required OM4 and OM3 now primary focus for new installations
Multimode Fiber Bandwidth Testing Quick review of OM4 fiber and high data rate applications Differential mode delay (DMD) testing in the factory Array solutions for 40/100G Summary focusing on system performance
DMD Control is Essential to support Laser-based systems OM4 Laser Optimized MMF 10 Gbps Bit Period Conventional 50 or 62.5 micron 10 Gbps Bit Period Fiber Core Center Received pulse at 10 Gb/s over 550 meters
Differential Mode Delay Measurement for Multimode Fibers SM Fiber Cladding High Speed Detector Cladding DMD Scan Example DMD Core Sample MM fiber Side View Sample MM fiber End View Single Mode 850nm laser Stepped in 2 um intervals in 1 quadrant (from edge to center of core) Best predictor of effective laser bandwidth DMD = Difference in delay time between the latest and earliest arriving pulses
Differential Mode Delay Measurement for Multimode Fibers SM Fiber Cladding High Speed Detector Cladding DMD Scan Example DMD Core Sample MM fiber Side View Sample MM fiber End View Single Mode 850nm laser Stepped in 2 um intervals in 1 quadrant (from edge to center of core) Best predictor of effective laser bandwidth DMD = Difference in delay time between the latest and earliest arriving pulses
Bandwidth Vision + Knowledge Determination = through Control DMD Testing is Based on Critical Assumptions DMD is the pulse spread among the modes measured via a composite set of radially separated scans DMD measured in 12! m increments Bandwidth of LOMMF is determined by a series of measurements that characterize the differences the propagation delay of the various modes of light Key assumption is that the highest two mode groups are fully attenuated (nullified) 50! m core
Bit Error Rate (BER) Correlated to DMD Testing BER typically steadily decrease as received power increases
Multimode Fiber Bandwidth Testing Quick review of OM4 fiber and high data rate applications Differential mode delay (DMD) testing in the factory Array solutions for 40/100G Summary focusing on system performance
10GbE End-to-End Electronics Why start a Next-Generation fiber discussion talking about 10G? 10GBASE-SR fiber transceivers are mainstream! Cost competitive! Applications exist! Existing MM Fiber Infrastructure 10GBASE-CX (Twinax)! Converged Network Adapters 10GBASE-T! Existing CAT6A Infrastructure! Electronics are now available from switch and NIC vendors Why is this important?
Higher Speeds Proliferate Throughout the Data Center CISCO Jan 2010 Array cabling solutions with OM4 optical fiber support this migration without the need to replace the cabling infrastructure when upgrading the electronics.
Preterminated Fiber Cables are the Norm 2007 66% of fiber installed in the Data Center is pre-terminated 2009 Expected to reach 75%+ BSRIA Jan 2008 Storage, Network, Server Applications 10GbE and 8GFC applications TODAY 40/100GbE and 16GFC applications TOMORROW Instant connectivity Modular, adaptable cabling solution Factory tested reliability
Parallel Lane Transmission Topology Limits for OM4! The primary multimode channels for past Ethernet data rates have been defined around duplex connectivity! 802.3ba will utilize parallel optics for both 40Gb/s and 100Gb/s 100GBASE-SR10
Goal of 40/100G with Converged Network Upgrade from 10GbE to 40/100GbE with the capability to benefit from Fibre Channel over Ethernet is simple Existing MPO based cabling replaces LC Data Center Switch 10G 40G Ethernet FCoE LAN Switch OM4 and OM3 fiber supports the upgrade Migration path is reality Server 10G 40G Ethernet FCoE
Moving from Serial to 100G Parallel Serial Ethernet Step 1 Remove LC-MPO modules Re-use MPO trunk cables Transition to Parallel Step 2 Replace LC-MPO modules with MPO adapter panels MPO patch cords Step 3 Complete circuit with MPO patch cords
4 x 4 Parallel Module for 40GBASE-SR4 Applications Use with Switches, servers and routers that offer optical interfaces that deliver 40 Gbit/s Ethernet Provides 100% use of 12-fibre backbones. Assures correct polarity throughout the 4 x 4 Parallel network using internationally standardized array polarity methodology Accepts existing MPO trunk cables in the backbone Upgrades network speed while achieving 100% fiber utilization in trunks Provides higher connectivity density than aggregations of 2-fibre channels Low-loss connection technology Two 12-fibre MPOs Three 8-fibre MPOs
Moving from Serial to 40G Parallel Serial Ethernet Step 1 Remove LC-MPO modules Re-use MPO trunk cables Transition to Parallel Step 2 Replace LC-MPO modules with MPO 4x4 parallel module MPO patch cords Step 3 Complete circuit with MPO patch cords
Current Parallel Routing Example 1-plug x 1-row application (Method B Shown) Example optical path Lateral signal transposition: leftmost Tx to rightmost Rx Type-B1 array connector patch cord Type-B1 array connector patch cord Type-B1 Array connector cable
New Application Interface Type (one plug with two rows) 100GBASE-SR10 option A Compatible with lateral signal transposition convention. Imposes new requirement for row transposition. Necessitates definition of new equipment cords
24-Fiber Parallel Routing Example 1-plug x 2-row application (Method B Shown)
10G Serial to 40/100G Parallel Upgrade Preserve Your Investment Reuses trunks Reuses panels Reuses racks No re-termination Reversible
Multimode Fiber Bandwidth Testing Quick review of OM4 fiber and high data rate applications Differential mode delay (DMD) testing in the factory Array solutions for 40/100G Summary focusing on system performance
What s Important in System Performance Fiber Bandwidth BER testing in the field is impractical and expensive Cable supplier must be able to evaluate a CABLED product Standards provide direction on how to test OM3 and OM4 fibers Speed and ease of installation Standards and industry support Upgradeability
Summary and KEY TAKEAWAYS 10GBASE-T Electronics are available! Usage is upward trend, $ and Power is downward trend! Drives need for higher speeds (optical fiber) in the network Evolution of 10GbE electronics in access drive 40/100GbE networks in distribution/core 40/100GbE network electronics standardized on MPO connector! Pre-terminated MM fiber recommended Distance is reduced in standards for MM fiber over 40/100GbE 40GbE drives FCoE adoption to server! Distance dependent on Ethernet 4 x 4 Parallel Module minimizes dark fiber during migration of existing MM cable plant from 10/40/100GbE Method B Polarity uses common MPO array cords at both ends of the channel OM4 optical fiber supports 95%+ of Access-Distribution & Distribution-Core lengths with full design flexibility
Preparing for the Future Given the trend towards: Higher cost and power consumption of SM solutions Multi-lane transmission (parallel & WDM) Higher lane rates And knowing: Your cabling needs to: - Support today s duplex technology and - Allow migration directly to parallel applications That OM4 fiber: - Is Standardized - Supports broader wavelength spectrum, longer reaches, and higher data rates - Is adopted by leading applications Designers should look to provide a cabling solution with: OM4 (preferred) or OM3 (minimum) optical fiber Array cabling that migrates easily and simply to parallel optics Low loss MPO connectivity
Thank you! Kevin Paschal Sr. Product Manager Enterprise Fiber Solutions
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