東南大學(xué)考研固態(tài)電子器件20xx-20xxcha(編輯修改稿)
2024-09-07 16:05 本頁面
【文章內(nèi)容簡介】 M. ??~ from several nm to several hundred nm Light emitted from a LED is not monochromatic light! Light source LED , laser fiber detector Fiber Optic Communications Photodiode Optical fiber material（石英） An outer layer of very pure fused silica A core of germanium doped glass Index of refraction n1n2 Singlemode fibers 單模光纖 (2a~10μm) Multimode fibers 多模光纖（ 2a=50125μm） Stepindex突變型光纖 (階躍折射率光纖） Gradedindex漸變（折射率）型光纖 ?Index profile（折射率分布） ?ararnnrn???21)(階躍折射率分布 (Step Index fiber 漸變折射率 分布 GI fiber ?ararnarnrn?????2121 ])(21[)(?Where， 2122212 nnn ??? ， α~1~∞ ? (cable)光纜 ?Fabrication(光纖的制造 ) 硫化（固化） xxePxPeIxI??????00)()(α (1/km) is attenuation coefficient, and the attenuation is not the same for all wavelengths. mm???????Attenuation or loss(衰減或損耗） ?1310 nm : dB/Km ?1550 nm : ?850 nm : dB/Km ?光纖熔接點損耗： ?光纖熔接點 1點 /2km )/l o g (10)( ino u t PPdBL o s s ??LPPkmdBA ino u t /)/l o g (10)/( ???Dispersion Dispersion is another important consideration in choice of operating wavelength. Dispersion can cause signal disorder. ps/nmkm (1)Chromatic Dispersion（材料色散） : wavelength dependence of the
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