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2.光接收机光接收机的作用是:把光纤传送来的光信号转换为电平合适、噪声低、幅频特性平坦的电视射频信号,送入电缆分配网络进行分配至电视用户收看。光接收机分室内型和室外型,两者除供电方式不同外,工作原理基本上是一样的。它主要包括光检测器组件,输入输出放大器、均衡网络、可变衰减器、自动增益(AGC)控制、数据采集与控制和电源等部分。其组成方框图如图13所示。
2. Optical receiver The role of optical receiver is: the optical signal transmitted from the optical fiber into a suitable level, low noise, amplitude and frequency characteristics of the television signal RF flat, into the cable distribution network for distribution to the TV user to watch. Optical receiver sub-indoor and outdoor, both in addition to different power supply, the working principle is basically the same. It mainly includes light detector components, input and output amplifiers, balanced networks, variable attenuators, automatic gain (AGC) control, data acquisition and control and power supply and other parts. The composition of the block diagram shown in Figure 13.