optical fiber 专业英语.ppt

OE, HUST OE, HUST Optical fiber manufacturing technology 2013-10-17 Outline 1. Introduction 2. Optical fiber structure 3. Optical fiber manufacturing process Optical fiber preform Optical fiber drawing 4. Summary The invention of laser in 1960－carbuncle laser Maiman(American) LD(GaAs 870nm)－in 1962 It was suggested in 1966 that optical fiber may be the best transmission medium to guide the light. C.K.Kao(British scientist) and C.A.Hockham Problem: high loss(in excess of 1000dB/km) 1、Introduction Fiber: low loss media! 1966, C.K. Kao 1000 dB/km 1970, Corning →20 dB/km 1972, Corning → 7dB/km 1973, Bell lab →2.5dB/km 1976, Japan →0.5dB/km@1.55μm 1979, →0.2dB/km@1.55μm now →0.16dB/km@1.55μm Limitation: Rayleigh scattering intrinsic absorption 1、Introduction * 1、Introduction Core 纤芯 Cladding 包层 Coating 涂覆层 －内层（buffer layer） －外层（top layer） 2、Optical fiber structure Material Preparation Material Purify Fiber Preform Fiber Drawing Fiber Coating Fiber Select Qualified Fibers Purity Analysis Performance Testing  Preform Analysis 3、Manufacturing process * Optical Fiber Preform Size： －Diameter：φ60mm，φ80mm，φ150mm －Length： 1m～2m Optical Fiber Preform Requirements： － High purity － Accurately refraction index profile Optical fiber preform 气相沉积Vapor Deposition 棒外化学汽相沉积法(OVD-Outside Chemical Vapor Deposition) 轴向汽相沉积法 (VAD-Vapor phase Axial Deposition) 改进的化学汽相沉积法 (MCVD-Modified Chemical Vapor Deposition) 微波等离子体激活化学汽相沉积法(PCVD- Plasma activated Chemical Vapor Deposition ) Optical fiber preform * Market share of four techniques Optical fiber Preform VAD Silica Stick 石英棒 Perform 预制棒 Soot Perform 疏松预制棒 Reactants 反应物质 Blowtorch 喷灯 OVD MCVD Moving移动 Flowmeter流量计 Blowtorch喷灯 Silica tube石英管 Reactants 反应物质 熔融石英管 反应物质 排气口 等离子体 玻璃层 1000~1200℃ 微波谐振腔 PVCD * Fusion group 1 Fusion group 2 Furnace Moveing Coating 1st Coating 2nd Feed