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ITT光电公司专为电缆电视研制了光纤新的脉频调制组件,在电缆电视应用场合,光传输的优点很多,包括与同轴电缆相比,噪音干扰较低,传输距离较长,并且脉频调制可获得质量较高的线路,而不需要用线性度好的光源。发射机组件的光源可以用高辐射的发光二极管或沿发射发光二极管,并可以互换,而不必重新作特性鉴定。光纤色散或模式噪音所引起的失真最小。接收机组件采用雪崩光电二极管。通常,在组件之间采用芯径为50μm的渐变型二氧化硅光缆,信/噪比为57dB时,光程损耗
ITT Opto has developed a new pulse-frequency modulation module for cable television. In cable television applications, optical transmission has many advantages, including lower noise interference and longer transmission distance compared to coaxial cable, and pulse frequency Modulation can get higher quality lines, without the need for linearity good light source. Transmitter components of the light source can be high-emitting light-emitting diodes or emitting diodes, and can be exchanged without having to re-characterization. Fiber dispersion or mode noise caused by the smallest distortion. Receiver assembly with avalanche photodiode. In general, a tapered silica fiber cable with a core diameter of 50 μm is used between the components. When the signal / noise ratio is 57 dB, the optical path loss