Extending the Lifecycle of Fiber Optic Cables. John Culbert President and Partner, Megladon Mfg. Group Austin, TX
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1 Extending the Lifecycle of Fiber Optic Cables John Culbert President and Partner, Megladon Mfg. Group Austin, TX
2 Introduction Fiber optic cables are considered a weakness in optical networks Fiber cables are very fragile and sensitive to damage when handling Making fiber optics meet performance expectations and withstand field/installation handling are important challenges Industry Best Practices can help us achieve these goals, but robust connector technology can help us avoid the challenges
3 Outline 1) Common Physical and Mechanical causes for Performance Decline in Fiber Optic Connectors Inspection and evaluation criteria Individual Factors Case Study Discussions and Experimental Evidence Industry Best Practices and Prevention Techniques 2) Proposed Solution through Tempering Technology
4 Scratches and Pitting Scratches on the end face of a fiber optic surface drastically reduce its performance Scratches are created by: Improper Handling Improper Cleaning Insertions into Inspection Equipment Multiple Matings Any time the end face contacts something other than a cleaning tool or another properly oriented fiber end face, there is the potential for scratches to develop
5 Scratches and Pitting Case Study International Electronics Manufacturing Initiative (inemi) Scratches have a negative effect on Return Loss (RL), a key fiber performance indicator Connectors under regular test environment use for 18 months saw return loss increased from -55db to an average of -42db Zone 3 Ferrule Zone 1C Epoxy Ring Zone Descriptions Zone 1B Cladding Zone 1A Core Conclusions: Scratches significantly degrade optical performance, especially return loss Zone 2 Contact Area Zone 3 Ferrule
6 Inspection Criteria From IPC Cleaning Methods and Contamination Assessment for Optical Assembly Zone Description Diameter Allowable Visible Contamination Non-Removables Scratch Width 1a Area Near Core (SMF only) < 25 um None None Area Near Core (MMF only) < 66 um 1b Cladding 7 (SMF Only) 25 um to 125 um Total of 5 NRs < 5um None > 5um NRs < 2 um are Acceptable Total of 5 NRs < 5um None > 5um Total of 5 scratches < 3 um None > 3 um None > 3 um Cladding 7 (MMF Only) 66 um to 125 um NRs < 2 um are Acceptable Total of 8 NRs < 5um None > 5um None > 3 um -- Epoxy Ring Zone 120 um to 130 um Any Any 2 Contact Diameter um to 250 um None > 10um None > 3 um 3 Ferrule Diameter um to 400 um None > 30 um Any
7 Scratches and Pitting Prevention Inspection Follow inspection criteria. Any scratch can degrade performance Proper Handling protect end face at all times. Cap un-used connectors Proper Cleaning Use only approved cleaning products to prevent scratching Carefully insert connectors into inspection ports even this can create scratches Solutions Proper Technician Training More robust connectors that withstand handling
8 Contamination Contamination Consists of dust, dirt and various other forms of debris Difficult to avoid Contamination happens anytime you remove the end cap and endface is exposed Subject to the inspection guidelines mentioned earlier Prevents even contact between cable end faces during mating Blocks signal through core 80% of contaminants are silica particles
9 During repetitive connector mating and de-mating cycles, dust particles can accumulate and redistribute at the connector end face. Electrostatic charge force was one of the mechanisms responsible for the particle accumulation, redistribution and their movement in the core area. Contamination Case Study International Electronics Manufacturing Initiative (inemi) Experimental Dust Applied
10 Contamination Case Study inemi 5 th Mating, 200x Particles had a tendency to migrate specifically towords the core over the course of multiple matings The core is EXTREMELY sensitive to contamination. The accumulation of dust particles seriously impaired fiber performance A dust particle 5um wide in the core of a SM fiber assembly can effect more than one half of the signal
11 Contamination Best Practices Per IPC Always inspect and clean fiber connectors before insertion Clean with dry wipes and cleaning fluid Absorbent wipes of woven or entangled nature Use IPA or other solvent to clean end face Always clean with dry wipe again after solvent use Clean connectors again when re-inserting in another port Careful some contamination can lead to scratches during cleaning See IPC for cleaning methodology Solutions Reduction in ESD Generation during cleaning Smoother end face is more resistant to contamination gathering
12 Multiple Insertions Multiple insertions can impact cable performance by: Creating scratches Increasing contamination Migrating contamination towards core of fiber Damaging epoxy ring All connectorized fiber assemblies have a limited number of matings that they can withstand and still perform adequately
13 Multiple Insertions Case Study - inemi Based on inemi research in 60 % of all examined LC connectors, a series of five repeated matings/demating operations resulted in an increase of IL of 0.5 to 1.1 db due to particle movement from the ferrule and cladding areas towards the core
14 Multiple Insertions Prevention Exercise Cleanliness Best practices between matings Verify both connectors are free of contaminants Solutions Develop connectors that are resistant to the effects of multiple matings Note that connectorized assemblies have a mating limit replace cables that have exceeded their life cycle
15 Inspection Best Practices Inspection Criteria - Revisited Zone Description Diameter Allowable Visible Contamination Non-Removables Scratch Width Zone Descriptions 1a 1b Area Near Core (SMF only) Area Near Core (MMF only) Cladding 7 (SMF Only) Cladding 7 (MMF Only) -- Epoxy Ring Zone 2 Contact Diameter 8 3 Ferrule Diameter 8 < 25 um None None < 66 um 25 um to 125 um 66 um to 125 um Total of 5 NRs < 5um None > 5um NRs < 2 um are Acceptable Total of 5 NRs < 5um None > 5um NRs < 2 um are Acceptable Total of 8 NRs < 5um None > 5um 120 um to 130 Any um 130 um to 250 None > 10um um 250 um to 400 None > 30 um um Total of 5 scratches < 3 um None > 3 um None > 3 um None > 3 um Any None > 3 um Any Zone 3 Ferrule Zone 1C Epoxy Ring Zone 2 Contact Area Zone 1B Cladding Zone 1A Core Zone 3 Ferrule
16 Inspection Best Practices Keys to Successful Inspection Use Proper Inspection Equipment Bench Top Scope Handheld Scope, Port Probe Scratches can be 200x or 400x magnification Scratches and contamination on the core or cladding is unacceptable If scratches, re-polish the connector Contamination should be cleaned, then connector re-inspected
17 Cleaning Best Practices Keys to Successful Cleaning Use Proper Cleaning Equipment and Technique Dry Wipe on soft surface Hard surfaces may damage ferrule Cleaning Cassettes IPA or other non-water based cleaning solvent Always use dry wipe after solvent use Contamination on the core or cladding is unacceptable Contamination should be cleaned, then connector re-inspected If contamination contains oils or residues, a solvent must be used
18 Cleaning Best Practices From IPC Comparison of Cleaning Fluid Properties
19 Installation Guidelines Fiber Mechanical Limits Maximum Cable lengths Minimum Bend Radius Pull Tension Restriction
20 Installation Guidelines Never Pull by the Connector Use Pulling Eye or Grip for Trunks Monitor Pulling Tension Use Straight Pull Do not twist cable
21 Proposed Alternative Tempered Mating Surface Accomplished by heat treating mating surface similar to a tempered windshield Hardness of Mating Surface increases Smoothness of mating surface increases
22 Tempered Mating Surface Features Scratch Resistant Promotes minimum insertion loss and return loss Heat anneals mating surface to prevent contaminant leaching Heat heals any imperfections near the end of the glass Smooth surface reduces ESD build up (less friction) Smooth surface reduces build up of contaminants Extended life span Easy Cleaning Durable enough to handle multiple matings Compatible with all existing connectors
23 Tempered Mating Surface Benefits Easy to install Repeatable Network Performance and Reliability Reduced Network Downtime Increased Customer Satisfaction Saves Time and Money
24 Tempered Mating Surface Visual Inspection Summary Report December 9, 2008, 11:24:51 AM File Name No Insertions Visual Inspection Summary Report December 11, 2008, 3:45:44 PM File Name 1000 Insertions Pass Serial Number Inspection Summary Zone Name Diameter (um) Scratches Inner Outer Result Count Zone A 0 25 Pass 0 Zone B Pass 0 Zone C Pass 0 Zone D Pass 0 Core Size 9um Fiber type Simplex Fiberchek2, Westover Scientific Inc. Pass Serial Number Inspection Summary Zone Name Diameter (um) Scratches Inner Outer Result Count Zone A 0 25 Pass 0 Zone B Pass 0 Zone C Pass 0 Zone D Pass 0 Core Size 9um Fiber type Simplex Fiberchek2, Westover Scientific Inc.
25 Tempered Mating Surface Number of Matings VS Insertion Loss
26 Conclusions Scratches and Contamination on Fiber Optic cables drastically reduce performance By following industry best practices, we can prevent some scratches and make better efforts to keep connectors clean from contamination Following these practices does not guarantee clean connectors and a scratch free surface Tempering (heat treated) technology exists that creates a scratch resistant mating surface and extends the life cycle of the product
27 References (1) Accumulation of Particles near the Core during repetetive Fiber Conenctor Matings and Dematings. NFOEC 2007 Presentation. Berdinskikh, Tatiana, March 29, 2007 (2) Cleaning Methods and Contamination Assessment for Optical Assembly. OFC 2006 Presentation. Berdinskikh, Tatiana, March 6, 2006 (3) Degradation of Optical Performance of Fiber Optic Connectors in a Manufacturing Environment. inemi Presentation. Berdinskikh, Tatiana (4) The Investigation of ESD effects on Mated Fiber Optic Connectors. inemi Presentation. Culbert, John (5) IPC Cleaning Methods and Contamination Assessment for Optical Assembly
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