Latest up-date of the heat resistant POF cable for the MOST automotive network system

Transcription

1 Latest up-date of the heat resistant POF cable for the MOST automotive network system 18 th Nov. MOST Interconnectivity Marriott Hotel Seoul, Seoul Korea Kazuki NAKAMURA, Yoshihiro TSUKAMOTO Opt-device dept.,mitsubishi Rayon Co., Ltd.

2 Outline Introduction Background: Market requirement for POF Technology review of high temp POF for the MOST system Additional data Bending loss Bandwidth

3 Bare fiber Core/Cladding structure POF Products Standard Diameter:0.25~3mmΦ Cable or Cord Jacketed fiber with varieties of plastics Jacketing materials: PE, PVC, PA12 etc. Constructions: Simplex, Duplex or more, Aramid yarn reinforced, etc Light propagation 0.25~3.0 mm Core: PMMA (refractive index = 1.492) Cladding: Fluorinated polymer (Lower index = ~1.402) Refractive index

4 Variety of applications Lighting & Illumination Industrial light for machine vision Photo-electric switch Host computer PC NC PLC DCS P C Field-Bus, Machine Control Factory level Cell level Field level Automotive networking Digital audio Optical Switch Power plant/substation, Locomotive/Train control Avionics Residential data-com

5 Temperature stability >> 85 C Motivation for the development Media comparison among POF, PCS, UTP and STP Cable Type Fiber Characteristics POF PCS Cost down potential of technology Active components (FOT, Magnetics) for >> 85 Bandwidth Copper UTP STP Bending radius, ease of installation Power budget/signal Quality/EMC@Bandwidth Diagnosis, Fault detection, Repair Scalability, Usability-over-cost in other automotive applications Over all sum Source; MOST Interconnectivity conference, Experience and Future scenarios by BMW AG POF for automotive, temperature limitation is, and has been always thought to be a concern Mitsubishi Rayon continue to challenge for improvement of temperature limit above 85 C to cast aside such concerns, with success for non-automotive applications and soon automotive For this specific case, the technology fits the optimized cable system for the MOST requirement

6 Off-the-shelf 105 products Item BH4001 BHM4001 Optical Fiber Material Core PMMA Cladding Fluorinated Polymer Refractive Index Profile Step Index NA 0.58 Cladding diameter 1,000μm BHM4002 Jacket Material Color Construction Typical dimensions Cross-linked PE 2.2mm Simplex Polyolefin Elastomer Black Duplex 2.2mm 2.2*4.4mm Sectional view Performances Maximum rating Optical Properties Operation Temp./dry Operation Temp./95%RH Loss at 650nm -55~105 ~85 ~200dB/km

7 Non-automotive use case of 105 POF Power plant or substation, locomotive (Existing) Data transmission in high voltage environment in high temperature Avionics (Future) Light weight/small size Lower cost compared against glass fiber system Immune to EMI susceptibility and radiation Feature/Advantage 105 resistance Input/Output isolation No short-out

8 Automotive key requirements and target Based on present 85 requirement Test Guidelines for fiber Optic Cable / Prufrichtlinie fur LWL-Meterware Heat resistance:105 < 200 db/km High humidity resistance:85 < 200 db/m According to the above Test Guidelines, PG 6 Climatic Reistance Stripping force (Inner-jacket from fiber): >50 N /24hrs: <±30 μm Thermal /24hrs <0.6 % Material Bending stiffness/handling while harness fabrication Non-flammability 1.51mm 1.00mm Inner Sheath: un-strippable from fiber 2.30mm Fiber with new cladding Outer Sheath: strippable from inner sheath

9 Design concepts Design changes Fiber Replacing cladding to high Tg, where present cladding can not survive over 85 C in long term (multiple thousands hours) Stay with same PMMA core (Tg: ~110 C) which is sufficient for 105 C Jacketing Selected new outer sheath instead of soft Poly Amide (PA), that also influence long term stability beyond 85 C Stay with PA12 for inner sheath to maintain weld-ability with PA12 plastic ferrule Key parameters Aging stability of cable attenuation (high temp & humidity) Thermal shrinkage and pistonning Material dependent chemical & mechanical characteristics

10 Outer sheath Key Technology Divided two layers with two different functions To protect the core from heat degradation by migration of extrinsic element To keep the cable appropriately flexible to provide easy handling Inner sheath PA12 Same as current product Stay with PA12 for inner sheath to maintain weld-ability with PA12 plastic ferrule

11 Attenuation aging Existing product 105 resistant cable Aging Time [hrs] Loss at 650nm maintain low level up to 3000hrs

12 85 /95%RH aging Attenuation Aging Time [hrs] Loss at 650nm keeps low level during 3,000hrs moisturized aging

13 System Robustness of High Temperature POF Cables Present product and 105C high temp product Normal cable High temp cable loss 0.30 loss temp ,000 3,000 6,000 hrs temp ,000 3,000 6,000 hrs

14 Temperature aging coverage of POF Cables Present product and 105C high temp product (temp. vs Time) 10,000 High temp cable Time(hrs) 1,000 Present product Temperature( )

15 Summary test results Item 105 aging 85 /95%RH aging Strip force Fiber/Inner Pistoning Fiber/inner Shrinkage Flame retardancy Bending stiffness Test result 170dB/km at 3,000h 54N 9μm 0.57% PASS (10/10) 17~20N Requirement <200dB/km 3,000hrs <200dB/km 3,000hrs >50N <30μm hrs <0.6% hrs <30sec. 10~18N Key requirements are confirmed to be conformed according to the Test Guidelines for fiber Optic Cable / Prufrichtlinie fur LWL-Meterware

16 Loss spectrum Attenuation [db/m] Exisiting cable 85C-1 85C-2 85C-3 85C-4 85C-5 Requirement Attenuation [db/m] resistant cable 105C-1 105C-2 105C-3 105C-4 105C-5 Requirement Wave length [nm] Wave length [nm] Similar spectrum to existing product, attributed to common core material

17 140 Bandwidth NA= NA= Bandwith (MHz*20m) MOST Requirement > 50MHz Sample Number

18 105 product Induced loss (db) Bending loss product Sample.1 Sample.2 Sample.3 Sample.1 Sample.2 Sample.3 Requirement Bend radius (mm)

19 Multiple bending 2.0 Incremental loss (db) Measurement condition - Cable total length: 2m - Interval btwen bends: 10cm - Launch NA: Full-stimulation (LED) - Length from the source to the first bending point: 50cm R=10 85 R=15 85 R=25 85 R= R= R= Bend times

20 Ongoing study Minor optimization to fix the final design Color variation and further testing Continue aging test at different temperature (95, 100, -40 ) Specify cable products as higher temperature range for mass production Bandwidth Measurement in University of Applied Physics in Aalen (Germany) presented at MOST Forum 2010 Room temperature, High-temp.(110 ) and low-temp(0,-40 ) Compatibility testing with FOT and connector/harness manufacturer (Sample submitted to at least 2 FOT manufactures)

21 Summary New high temperature POF cable technology is reviewed This new product is developed based on technology of well-matured existing commercial products Mitsubishi has almost a decade experience to supply the POF to European automotive industry with outstanding reputation, continuing to develop new product for higher reliability in automotive application The most competitive producers among others as largest supplier for whole POF industry

22 Thank you for your attention!