Cookies Use on AFL Website We use cookies to give you the best online experience. By using our website you agree to our use of cookies in accordance with our privacy policy. Agree
Home / AFL Blog / April 2017 / The Path to 100G Single Lambda in the Data Center - Part 1
Blog posts

The Path to 100G Single Lambda in the Data Center - Part 1

Maury Wood, AFL Test & Inspection Product Line Manager

Part 1 (Part 2 - Part 3)

It is pretty widely acknowledged that 2016/2017 is prime time for 100 Gbps short reach optical links in the data center, interconnecting servers and switches.  While this is true, more accurately, this moment in history is prime time for 25 Gbps per wavelength or "25G single lambda" technology commercialization.

For example, the QSFP28 MSA transceiver form factor implements 100GBASE-SR4 short reach (up to 100 meters) links using 4 x 25 Gbps parallel optics, typically on OM4 multimode fiber.  It also implements 100GBASE-LR4 long reach links using four channel course WDM-based (LAN-WDM) serial optics, on single-mode fiber.  These are both direct detection systems, using simple on-off keying / intensity modulation.  The entire 25G single lambda signal chain, from the electrical SERDES I/O, the clock/data recovery retimers, the limiting drivers and laser diodes, the photo diodes, and the transimpedance amplifiers, i.e., all the necessary ingredients for 25G single lambda optical transceivers have come together to enable successful 100G commercial deployment in data centers and other networking applications.

This blog post is the first in a series on how the industry is likely to transition to 50G single lambda pluggable short reach transceivers (making 200 Gbps optical Ethernet transport commercially viable) and eventually to 100G single lambda pluggable short reach transceivers (making 400 Gbps optical Ethernet transport commercially viable).  Indirectly, this blog series investigates whether coherent detection methods will find a role to play in short reach optical links as rates approach 1 Tbps, as well as the future of multimode versus single mode fiber in the enterprise data center.

One of the "boundary conditions" that underpins this analysis (and one that has been widely acknowledged by industry analysts) is that, all things equal, network operators prefer to reuse existing optical cabling infrastructure when making data center network performance upgrades.  This preference obviously does not apply for new data center build-outs, but as a large part of the market serves existing data center upgrades, this thought process tends to float to the top of mind of data center designers and operators.  There are a couple of important ramifications of this preference.

First, new short reach transceiver technology must maintain the minimum reach of the previous generation(s), typically 100 or 125 meters.

Second, the number of optical lanes must be consistent with previous generations.  Specifically, the industry has shown a preference for four (simplex) / eight (duplex) fibers and MPO connectors since the transition from QSFP+ (4 x 10 Gbps) to QSFP28 (4 x 25 Gbps).  There is an economic sweet spot for eight fibers per link in the data center, and a strongly established ecosystem, including 12 ferrule MPO/MTP optical connectors (along with the requisite associated cleaning and inspection tools).  This sweet spot makes the success of 32 fiber proposals such as IEEE 802.3 400GBASE-SR16 (16 fibers x 25 Gbps x 2 for full duplex) questionable.

Third, the new transceiver technology must not require new fiber types, such as WBMMF (now OM5), unless building out a new data center.  Specifically, for short reach data center links, the new transceivers must provide adequate performance on legacy OM3/OM4 multimode fiber.

We'll explore additional interesting angles of these technical and commercial dynamics next time.

See part 2

Posted: 4/21/2017 by | with 0 comment(s)
Filed under: AFL, Data Center, Test and Inspection
Comments
Blog post currently doesn't have any comments.
Leave comment



 Security code

Recent Posts

A Deeper Dive into Flex-Span® ADSS Cable Benefits

6/28/2019 9:45:27 AM | with 0 comments
Carlos Escobar, the Mid-Atlantic Regional Sales Manager for Utilites for AFL, elaborates on how the new configurations of the Flex-Span® ADSS cable benefit the customer.

Video: FOCIS Lightning Video Available in Multiple Languages

6/28/2019 9:31:47 AM | with 0 comments
Our FOCIS Lightning product video is now available in French, German, Spanish and Japanese.

AFL Hyperscale To Host Future of Data Center Infrastructure Symposium

6/17/2019 12:43:08 PM | with 0 comments
AFL Hypserscale will host a one-day event examining the technology needed for data centers to stay agile in today’s more connected digital landscape. 

2019 Fiber Connect Recap

6/10/2019 12:49:30 PM | with 0 comments
Will Miller recaps AFL at the recent 2019 Fiber Connect expo in Orlando, Fla., highlightning the new products and FTTH trends on the rise.

AFL Expands Substation Portfolio with New Swage360™ Split Elbow

6/10/2019 7:43:30 AM | with 0 comments
AFL introduces the new Swage360™ Split Elbow for substation grounding applications. 

Blog Tags

100G 12R 12S 2014 2015 2016 21s 22S 31S 41S 5G 62S 70R 70S 802.11ax Access Networks accessories ADSS Aerial Aeros AFL AFL. Air Blown Fiber AlumaCore Aluminum APM-101 APM-102 APTA ASCEND ASIS Associates bandwidth Best Practices BICSI Blog bluetooth Broadband bus Cable cable deployment Cables Cable-Tec Careers Case Case Studies Catalogs Cell Tower Demarcation center Certification CGM Plus Rack Panel CI&M Innovators Award Cleaning Cleaning Supplies Cleaver cloud CO2 Lasers collaboration collapsible Community Community Outreach compression Compression Accessories Conductor Connect Connections Connectivity Connectors Co-ops Core-alignment Corporate CT-30 CT50 CTIA customer experience CWDM DAS data Data Center Data Centers Dead Ends demarcation Demonstration density Distribution Enclosure DT Duel Dura-Line DWDM eABF electric Enclosure end-to-end solutions Energy Enterprise Equipment ESB estimation Expo Exterior Distribution Cabinet Facebook Fall Fall 2013 FAST SC FASTConnect FC Features Fiber Fiber Cleaver Fiber Connector Inspection Fiber Distribution fiber inspection Fiber Laser fiber management Fiber Optic Fiber Optic Cable Fiber Optic Intrusion Detection System Fiber Optic Training Fiber OpticTraining Fiber Prep Fiber Security Fiber Shaping Fiber Splicing fibre optic cable field installable Field Splicer flexscan Flex-Span Flickr FOCIS FOCIS Duel FOCIS Flex FOCIS Lightning FOCIS WiFi2 French FSM-100 FTTh FTTx Fujikura FuseConnect Fusion Fusion Splicer Fusion Splicers Fusion Splicing Gas Glass Processing global Google Governor Nikki Haley Grand Canyon Greenville Grounding Hardware high High-Wire Walk HiTemp Hyperscale IDEAA IEEE infrastructure innovation Inspection Instagram Install Installation Installing Instructions Integrated Solution International Sales Meeting Interns IoT Kit Laser Last Mile LAZERMaster LC Light Brigade LightLink LightWave LinkedIn live line LL-550 LL-550 & LL-580 enclosures LL580 LL-580 LMHD Loss LZM-100 M210 M310 Maintenance Metro Ethernet Metro-E MFIS MicroCore Mining Month of Service mount MSOs Multi-Fiber Identification System Network Networks new New Year NFPA Nik Wallenda Noyes OCS OEM Oil One-Click OPGW Optic Optical Optical Connectivity Optical Sensing Optical Splicing optics OSP OSP MicroCore: LM200 & LMHD Series OTDR Outside Plant panel panels Paper PCS-100 Stripper Perimeter Security System PES Photonics Photonics West PhotonicsWest platform PM Splicing polarity Poli-Mod power Procedures product Product Registration Products rack Rail Railway Recoater Recruiting resource center Resources ribbon Rogue Rural Utilities Rusty Williams SB01 SC SCADA SCTE SCTE Cable-Tec SDN Selection Sensing Services Sidewinder Rapid Cable Deployment System Silver Level Award single circuit outage Single Lambda SkyWrap Small-Cell Smart City Smart-Grid Smartphone Snapshot Social Software Defined Networking Solutions Spanish Specialty Splicer Spider Web Ribbon SPIE Splice Enclosure Splicer Splicers Splicing ST Stockbridge Dampers Stranded Stainless Steel Cable Stream Streetcar Structured Cabling Study substation SuperMobility Support SWAGE Swaging SWAT SWFT System systems T&D T&I: technology Terminal termination Termination Instructions Test Test &Inspection Test and Inspection Testing Titan Tools trade show Trade Shows Training Transit transition transmission Transportation trends Tutorials Twitter Ultra HD Upstate Alliance utilities Utility VFI V-Groove Video Videos Vodafone WDM WDM900 We Connect Webinar Website White White Paper White Papers White-Paper Wi-Fi Winter Wireless workflow Wrapping Tube Cable WTC/SWR

Sign Up for eConnect!