March 2011 1 Low-Bend Fiber TechnologyRoger Krähenbühl
March 2011 2 For many Generation: at Home El. Opt. El. Opt. Web & Networkin the home Fiber-In-The-Home Running water in the home Electricityin the home Phone & Radioin the home TV & Faxin the home Hello World Hello World Hello World H+S provides excellent connectivity solution
March 2011 3 Suhner & Co. AG, Herisau, AR founded in 1864 R.+ E. Huber AG,Pfäffikon, ZH founded in 1882 For many Generation: HUBER+SUHNER the two companies merged in April, 1969 HUBER+SUHNER developed from a company only active in CH into an international group
March 2011 4 Communication Transportation Industrial Low Frequency including Carbon Fiber Composites Excellence in Connectivity Solutions: 3 x 3 Strategy Radio Frequency Fiber Optics With all three Technologies in all three Markets - Worldwide
March 2011 6 Why Fiber Optics? One optical fiber can replace thousands of electric wires.
March 2011 7 Today: Fiber to the Home becomes a Reality Fiber-to-the home requires new connectivity solutionsPlease visit us in hall 1.1 / booth A56
March 2011 8 Near Future: Fiber in the Home plug‘n‘play safety asap www.fiberyourhome.com
March 2011 9 Fiber to/in the Home: Installer Concerns Fast installation High yield Easy handling To overcome these concerns fiber manufacturer came up with new types of bend-insensitive optical fibers To give confidence H+S studied and tested such low-bend fibers
Roger Krähenbühl / Low Bend Fiber 10 Bend Single Mode Fiber: Physical Fundamentals Loss due to bend SM fiber (improper installations, etc.)
Index contrast higher contrast => better confinement
-> new low-bend fiber types
Roger Krähenbühl / Low Bend Fiber 11 Comparison: standard SM, trench-assisted, nano-structured Mode Profile StandardSingle Mode Design Index Profile Fiber Spec. 9.20.4mm Trench-Assisted Design Bend-optimizedDesign 8.90.4mm Nano-Structured Design 8.60.4mm Trench-assisted (A2), nano-structured (“A3”) and standard fibers (D) are tested, their inter-compatibility verified, and the results compared.
up to 450N/cm,1min each, l = 1550nm 0.5 0.4 SMF 0.3 trench-fiber 0.2 nano-fiber 0.1 Change of Attenuation [dB] 0.0 500 Compressive Stress [N/cm] -0.1 400 300 200 100 0 1 3 5 7 9 11 13 15 17 19 21 23 25 27 Time [min] Temperature Cycling CWJH-H27 Crush tests on CW-E9 14 12 SMF 10 Insertion Loss Variation [dB] 8 6 4 2 0 80 trench-fiber nano-fiber 60 40 20 Temperature [C] 0 -20 -40 -60 l=1550 nm 0 10 20 30 40 50 60 Time [h] Roger Krähenbühl / Low Bend Fiber 13 Mechanical Characteristics: Crush Tests, Temperature Cycling Low-bend fibers perform better under crush and temperature cycling tests than SMF.
Roger Krähenbühl / Low Bend Fiber 14 Splicing Tests: Performance Comparison SMF - trench-fiber SMF - nano-fiber Ease of Splicing and splice performance testing: All combinations for SMF, trench-, and nano-structured fiber Easy handling ? Loss Distribution per Splice 60 Mean:0.01 dB0.03 dB0.08 dB 50 SMF - SMF 40 30 % 20 10 0 0.15 0.01 0.03 0.05 0.07 0.08 0.10 0.12 0.14 0.00 0.02 0.04 0.06 0.09 0.11 0.13 Splice Loss [dB] Splicing of fibers with low-bend SM fibers needed much more exploration of process parameter than with the standard SM fiber types. They have slightly higher splice losses, maybe due to higher core ex-centricity (less experienced, larger fabrication tolerance chain) Low-bend fibers are well suited as higher splice loss can be over-compensated
SMF trench-assisted nano-structured Roger Krähenbühl / Low Bend Fiber 15 Assemby Process: Endface Polishing Assembling using today's process for standard G.652 fiber: SEM: No strange behavior during assembly process except for the visual inspection
Roger Krähenbühl / Low Bend Fiber 16 Assembling Capabilities: Endface geometry Assembling using today's process for standard G.652 fiber: SMF trench-assisted nano-structured Measured endface geometry are well within allowed tolerances (IEC 61755-3-1)
Roger Krähenbühl / Low Bend Fiber 17 Assembly Characteristics: Each-Each Insertion Loss Each-Each Loss Distribution 60 SMF - SMF 50 SMF - trench-fiber SMF - nano-fiber 40 30 % 20 10 0 0.00 0.02 0.04 0.06 0.08 0.10 0.12 0.14 0.16 0.18 0.20 0.22 0.24 0.26 0.28 Insertion Loss [dB] Insertion Loss measurements; IEC 61300-3-34 @1310nm 13x13 each to each measurements; plug‘n‘play Mean:0.07 dB0.10 dB0.11 dB Blink: easy install, laser protection Both types of low-bend fibers are quite well compatible to standard SM fiber. Due to their slightly higher loss full premium quality may be harder to achieve.
Roger Krähenbühl / BendOptimized MM Fibers 18 Low-Bend Multimode Fibers StandardSingle ModeDesign Index Profile Standard MultimodeDesign Bend-optimizedDesign Analog testing of bend-optimized and standard multimode fibers of different manufactures sowed similar results as in the single mode case. More Information can be found in the two white papers on low-bend fibers at: http://www.hubersuhner.com/products/hs-fiberoptics/hs-fiberoptic-cables/hs-p-fo-cab-know/hs-p-fo-cab-know-white.htm or ask for a hard copy at our booth A56
Roger Krähenbühl / Low Bend Fiber 19 Fiber Reliability Stress-behavior according to IEC 62048 Failure Probability in 20 Years for Different Lengths 1.E-08 High yield 10cm 1.E-07 1.E-06 10m 1.E-05 1000m Failure Probability 1.E-04 1.E-03 1.E-02 1.E-01 1.E+00 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 Bend Radius [mm] There is no physical reason for another lifetime behavior for the different types of fiber (stress distribution across fiber is the same). To reach similar reliability as for a LISA fiber management rack (r=30mm, >1000m bend fiber) only 5cm can be bend at r=10mm and only 1cm at r= 5mm.
Roger Krähenbühl / Low Bend Fiber 20 Summary We’ve extensively studied the new low-bend fibers (SM and MM) in HUBER+SUHNER connector assemblies. All low-bend fiber types clearly fulfill their specification and therefore outran their standard partners. Furthermore they are well compatible to their standard fiber partners. Standard assembly manufacturing process can be used. Splicing is more critical for the SM low-bend fibers. Lifetime reliability under very low-bending conditions is still an open question. Fast installation High yield Easy handling We do recommend to use low-bend fiber for bend and loss critical applications with the remark that splice process needs to be adapted. However we do not recommend to bend any type of fiber too tight.
March 2011 21 Thank you for your attention. Please visit us in hall 1.1 booth A56
March 2011 22 Key figures of HUBER+SUHNER Group 2009 631 53 8.4% 3 500 1 500 18 >77% CHF million Sales Operating profit (EBIT) in percentage of sales Employees worldwide Employees Switzerland Subsidiaries Equity ratio