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The Impact of Connector Quality on Network Elements

The Impact of Connector Quality on Network Elements. Presented by Jim Fasano, Director of Strategic Accounts. Many thanks to Sherlon Kauffman of US Conec Ltd . and the Team at Fiber Instrument Sales. Training Objectives.

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The Impact of Connector Quality on Network Elements

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  1. The Impact of Connector Qualityon Network Elements Presented by Jim Fasano, Director of Strategic Accounts Many thanks to Sherlon Kauffman of US ConecLtd. and the Team at Fiber Instrument Sales

  2. Training Objectives • Identify the sources for poor connector performance such as various common contaminants that are in the environment • Discuss and understand the impact that Optical Return Loss has on overall system performance (video signal degradation) • Learn techniques and technologies developed to eliminate performance issues

  3. Fiber Optic Cleanliness, a Basic understanding of effects • Connector end face cleanliness effects performance: • What is it? • Where does it come from? • Is it really that bad? Look familiar?? You are not alone…

  4. Common Contaminants • Debris generated from normal wear in mating and de-mating • Dry wall dust • Saw dust • Residues from end caps (outgassing) • Skin oil • Suntan lotion • Alcohol residue • Water residue • Vegetable oil • Hand lotion • Dryer lint • Saltwater residue • Graphite Dust Particles Hand Lotion Skin Oil and Dead Skin Flakes Alcohol Residue

  5. Common Sources of Contamination • Mishandling • Accidental touching transfers skin oil, hand lotion and vegetable oil • Lint generated from organic wipe materials (i.e. T Shirt, Jeans) • Environmentalsources • Saw dust, sheet rock and paint fumes from construction • Particle debris from cardboard boxes • Dust in the air from HVAC systems • Condensation • Poor technique and use of inferior grade cleaning products • Oil droplets from canned propellant and outgassing of the rubber in the seals • Cleaning solvent residues that are not completely wiped away • Exposed containers of alcohol • Fabric deposited (i.e. left behind) from cleaning cloths • Normal Wear By-Products • Ferrule materials • Adapter material (i.e. sleeve, guide pin wear on MT connectors) • Connector components (i.e. springs, housing) • Endcap abrasion or mold residue

  6. Causes of Network Failure • The chart above is a summary of a study from NTT-Advanced Technology that polled network owner and cable installers on the sources of network failures • 98% of cable installers and 80% of network owners answered “Yes” to having contamination be the root cause of a network failure.

  7. Impact of Dust Contamination • Dust particles can cause problems in three ways: • Dust on the core region will block the signal path • Dust may prevent proper physical contact • Dust can cause scratches and pitting defects

  8. Lasting Effects of Contamination Contaminated Endface Initial Clean Endface Mated 5 times dirty then cleaned results in severe permanent damage

  9. Residue Contamination • Liquid residues have different refractive indices than the fiber which can create problems during physical contact. • Residue contamination commonly contributes to opticalback reflectance. Example of dried alcohol residue Examples of liquid and oil residues

  10. Residue Cross Contamination Connector A Before Mating Connector B Before Mating Connector A After Mating Connector B After Mating

  11. What should a clean fiber look like? • Notes: • All the data assumes a 125µm cladding fiber • Multimode uses 65µm to accommodate 62.5µm and 50µm • Defect is defined as existing entirely within the inner-most zone which it touches • Source: IEC 61300-3-35 • Alternate source: IPC-8497-1 Zone A Zone B Zone C Zone D

  12. Signal Degradation on an MT Fiber

  13. Best practices

  14. Inspect connector Clean? No Clean Yes Mate Inspect. Clean. Inspect. • Always inspect both connectors before mating. • Mating dirty connectors may: • Cross contaminate both connectors • Scratch and pit the ferrule end face • Inspecting and cleaning before mating will: • Prevent permanent damage to connectors • Reduce trouble shooting time • Reduce material costs • Improve signal quality • Make keeping fiber optic connectors clean a priority. • Develop inspection and cleaning procedures • Train your team regularly on how to inspect and clean your connectors

  15. Fiber Optic Cleaning Tools1990’s & early 2000’s • Application: • (2) SC connectors (TX & RX) • Typical Cleaners: • Wipes, Swabs, CLETOP, “Other”

  16. Dry Wipes Fabric-based and paper wipes that provide a mechanical action to absorb residues and trap dust particulates • Examples include: Tissues, field cards, etc. • ADVANTAGES: • Cleans end face while disconnected from mating adapter • Common technique in the industry • Allows both dry & wet cleaning • DISADVANTAGES: • Cannot clean end face through mating adapter • Untrained operators can damage fiber end face • Must be protected from contamination until just prior to use • Some wipes can deposit fabric on the end face (self-contamination)

  17. Solvents / Wet Clean • Solvents provide a chemical action to clean fiber optic connector end faces. • Examples include: Water, alcohol, HFE, etc. • ADVANTAGES: • Provides more aggressive cleaning of contamination • Very effective against oils and dried-on contamination • DISADVANTAGES: • Untrained operators can leave behind residue, which can be more difficult to remove than the original contamination • A dry clean is always required after a wet clean (i.e. two sets of tools for the operator) • May not be portable enough for some applications • May violate some customer MSDS requirements • Some solvents are flammable • Some solvents have storage and/or shipping limitations Isopropyl Alcohol Residue

  18. Sticks & Swabs • Swabs may be beneficial for cleaning connector end faces installed in adapters • ADVANTAGES: • Cleans the ferrule end face while installed in mating adapters • Allows cleaning of some specialty connectors without requiring disassembly of the connectors • DISADVANTAGES: • Cannot clean end face while disconnected from mating adapter • Can be more costly than other methods • Limited cleaning effectiveness due to the physical constraints of the adapter • Some swabs can deposit fabric on the end face (self-contamination)

  19. Cleaning Cassettes • Relatively mature cleaning technology using a reel of specialty fabric • Examples include: OPTIPOP, CLETOP & NEOCLEAN • ADVANTAGES: • Low cost per clean • Faster cleaning times • Better consistency in cleaning performance • Refill packs for even lower cost per clean • DISADVANTAGES: • Cannot clean end face through mating adapter

  20. Next generation tools

  21. Refillable / Mechanical Cleaning Tools • NEW technology with optional refill cartridges • Examples include: NEOCLEAN-E Series tools • ADVANTAGES: • More eco-friendly • Cleans end faces in both mated (with adapter) and unmated conditions • Simple, One-hand operation • Faster cleaning times • Consistent cleaning performance • DISADVANTAGES: • Some tools have limited cleaning region • Some tools do not have a good method for keeping material on the track

  22. Mechanical Cleaning Tools • Relatively new technology that advances a cleaning cloth across the end face in a controlled fashion • Examples include: IBC™ Brand Cleaning tools • ADVANTAGES: • Cleans end faces in both mated (with adapter) and unmated conditions • Simple, One-hand operation • Faster cleaning times • Consistent cleaning performance • Custom tools can be developed for specialty connectors • DISADVANTAGES: • Some tools have limited cleaning region • Some tools do not have a good method for keeping material on the track

  23. Selecting a Cleaning Methodology • What connector types will need to be cleaned? • What type of contaminates will my technicians encounter? • Where are the connectors physically located in the network? • How many connector ends will need to be cleaned for this project? • What type of environment have the connectors been exposed to? • What type of environment will my technicians be cleaning in?

  24. Optical Return Loss and Reflection impact on Systems • What is Optical Return Loss? • What is Reflection? • What is the impact on Systems? • Why are connectors/splices of concern?

  25. Overview • Optical Return Loss is the Total % of Power reflected back from points along an optical path. • Optical Return Loss and Back Reflection impacts: • - Transmission Systems with Laser Transmitters • Any Analog transmission system (video) • Any system where there is a high concentration of interconnecting points • Effects! • - Increased receiver noise and an increase in Transmitter noise • - Poor video clarity in Analog systems, Pixilation in Digital video • - Overall loss of optical power, increasing cost and complexity of active • optical components as well as minimizing distances between points.

  26. Minimizing Optical Return Loss • Minimize reflective points by: • Maintain clean and contaminant free optical connector ends • Eliminate mechanical splicing of any fiber (Connector terminations, field splices, etc.) • Minimize connection points and unnecessary splices • Educate all technicians of the importance of “Optical Return Loss” and potential effects. • Any Questions?

  27. Thank you

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