【正文】 frared optical frequency or wavelength smaller longer a millimeter wave, microwave, short wave, medium wave and long wave and so on. The visible light is again posed of seven colors, that contain visible red light, orange light, yellow light, green light, blue light and shade of indigo light, etc. International Commission on Illumination uniform standard is required: select a wavelength of 700nm mercury spectrum in the red for the redbased color light, green light of a wavelength of base for the green shade, the blue wavelength of blue base shade. Conventional POF usually ultraviolet light is not very good, while quartz fiber and a special liquidcore optical fiber in the region has a good transmittance, POF in the visible region have very good light transmission rate, from POF core material selection and deuterium fluoride polymer material prepared POF in the near infrared region have a very good light transmission. Propagation of light in vacuum is the fastest speed, transmission medium, its refractive index is different from the speed of light transmission is also different. In contrast, a large refractive index of light transmission medium is denser medium, the refractive index of the transmission medium is a little sparse optical media, in terms of the POF, POF core material for the optical denser medium, POF material for light skin thinning medium, the light optical density media in the core material will reduce the propagation velocity, so the light transmission in the core material in the skin material slower than the transmission speed。光在均勻媒質(zhì)或不均勻媒質(zhì)中傳輸時(shí)，滿足費(fèi)瑪(Fermat) 原理，即光從空間一點(diǎn)到另一點(diǎn)是沿著時(shí)間為極值的路程而傳播的，即光沿著光程為最小或最大或恒量的路徑傳播。1880年，威廉也就是說光既具有粒子性，又具有波動(dòng)性，光在傳播時(shí)表現(xiàn)為波動(dòng)性，而與物質(zhì)作用時(shí)又表現(xiàn)為粒子性。POF之以能傳光是因?yàn)楣饫w具有芯皮結(jié)構(gòu)，光在POF中傳輸是按全反射原理進(jìn)行傳光的，光在SI POF中的傳輸方式為全反射式鋸齒型，光在GI POF中的傳輸方式為正弦曲線型；同時(shí)為了簡化計(jì)算，選用子午線進(jìn)行了參數(shù)計(jì)算，子午線就是光線的傳播路徑始終經(jīng)過光纖軸并在同一平面內(nèi)，這些參數(shù)計(jì)算包括最大入射角或發(fā)射光角度、數(shù)值孔徑、子午線在階躍型光纖中的幾何行程及反射次數(shù)；側(cè)面發(fā)光POF和熒光POF也是按全反射原理進(jìn)行傳光的，對于單芯側(cè)面發(fā)光POF多是由非固有損耗導(dǎo)致側(cè)面發(fā)光，而對于多芯側(cè)面發(fā)光POF則是由彎曲損耗產(chǎn)生側(cè)面發(fā)光的。 the same time to simplify the calculation, the parameters used for calculation of Meridian, Meridian is the propagation path of light through the optical axis and is always in the same plane, the calculation of these parameters include the maximum angle of incidence or emission angle, numerical aperture, In the steptype fiber radial geometry and reflectio